8,694 results
Search Results
2. Modelling permanent magnet excited uniform fields with rational approximations
- Author
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Costa, Stefano, Costamagna, Eugenio, and Di Barba, Paolo
- Published
- 2024
- Full Text
- View/download PDF
3. Distance-based paper/PMMA integrated ELISA-chip for quantitative detection of immunoglobulin G.
- Author
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Abate, Mahlet Fasil, Ahmed, Metages Gashaw, Li, Xingrui, Yang, Chaoyong, and Zhu, Zhi
- Subjects
- *
ENZYME-linked immunosorbent assay , *METHYL methacrylate , *PERMANENT magnets - Abstract
The enzyme-linked immunosorbent assay (ELISA) is one of the most commonly implemented clinical diagnostic tools for the detection and quantification of protein biomarkers. However, conventional ELISA tests require sophisticated infrastructure, expensive reagents, long assay time, and expertise for operation, which are not often easily accessible in resource-limited settings. Microfluidic ELISA-chip based point-of-care (POC) testing allows miniaturization and integration of complex functions that facilitate their usage in limited-resource settings. The current work demonstrates a simple, portable, low cost and equipment-free paper/poly(methyl methacrylate) (PMMA) integrated microfluidic ELISA-chip as a POC device with a visual distance-based readout for quantitative detection of clinical biomarkers. The integrated paper/PMMA ELISA-chip utilizes the movement of immunoassay complexes with magnetic beads by a permanent magnet in a PMMA part of the compartment. The target concentration is translated into a visual distance signal readout for quantitative detection of biomarkers in a μPAD. Because it does not require sophisticated instruments and has the added advantages of low cost, easy operation, and disposability with quantitative visual readout, the paper/PMMA ELISA-chip holds great promise for portable detection of target bioanalytes as a POC diagnostic tool in resource-limited setups. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
4. Low-speed permanent magnet generator for use in a compact wind turbine
- Author
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Cichowicz, Michal, Pilecki, Wojciech, Wardach, Marcin, Prajzendanc, Paweł, Cierzniewski, Kamil, and Palka, Ryszard
- Published
- 2023
- Full Text
- View/download PDF
5. Micromagnetics and multiscale hysteresis simulations of permanent magnets
- Author
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Yang, Yangyiwei, Kühn, Patrick, Fathidoost, Mozhdeh, and Xu, Bai-Xiang
- Published
- 2023
- Full Text
- View/download PDF
6. Design and test of an open portable MRI system
- Author
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Chauviere, Simon, Belguerras, Lamia, Lubin, Thierry, and Mezani, Smail
- Published
- 2022
- Full Text
- View/download PDF
7. Upwing Energy to Present Paper at Offshore Technology Conference Brazil 2019
- Subjects
Offshore Technology Conference ,Conferences and conventions ,Permanent magnets ,Offshore oil field equipment ,Technology ,High technology industry ,Telecommunications industry - Abstract
(PRWeb) - Upwing Energy, an artificial lift technology company, announced today that President and CEO Herman Artinian will present at the Offshore Technology Conference (OTC) Brazil in Rio de Janeiro [...]
- Published
- 2019
8. Upwing Energy to Present Paper at Offshore Technology Conference Brazil 2019
- Subjects
Offshore Technology Conference ,Conferences and conventions ,Permanent magnets ,Offshore oil field equipment ,Technology ,High technology industry ,Business, general - Abstract
CERRITOS, Calif. (PRWEB) October 22, 2019 Upwing Energy, an artificial lift technology company, announced today that President and CEO Herman Artinian will present at the Offshore Technology Conference (OTC) Brazil [...]
- Published
- 2019
9. Calnetix Technologies to Present Paper at Motor & Drive Systems Conference 2018
- Subjects
Conferences and conventions ,Electric equipment ,Permanent magnets ,Telecommunications industry - Abstract
(PRWeb) - Co Huynh, a co-founder of Calnetix Technologies and the Business Unit Leader for the company`s electric turbo division, will present a paper on motor and drive systems on [...]
- Published
- 2018
10. Calnetix Technologies to Present Paper at Motor & Drive Systems Conference 2018
- Subjects
Conferences and conventions ,Electric equipment ,Permanent magnets ,Business, general - Abstract
CERRITOS, Calif. (PRWEB) February 05, 2018 Co Huynh, a co-founder of Calnetix Technologies and the Business Unit Leader for the company's electric turbo division, will present a paper on motor [...]
- Published
- 2018
11. A Novel High Performance Discrete Flux Integrator for Control Algorithms of Fast Rotating AC Machines.
- Author
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Rossi, Claudio, Pilati, Alessio, Bertoldi, Marco, and Bianchini, Claudio
- Subjects
RELUCTANCE motors ,PERMANENT magnets ,ELECTRONIC paper ,ELECTRIC machines ,ELECTRIC metal-cutting ,FLUX (Energy) ,AC DC transformers ,INTEGRATORS - Abstract
This paper deals with the digital implementation of a motor control algorithm based on a unified machine model, thus usable with every traditional electric machine type (induction, brushless with interior permanent magnets, surface permanent magnets or pure reluctance). Starting from the machine equations in matrix form in continuous time, the paper exposes their discrete time transformation, suitable for digital implementation. Since the solution of these equations requires integration, the virtual division of the calculation time in sub-intervals is proposed to make the calculations more accurate. Optimization of this solver enables faster runs and higher precision especially when high rotating speed requires fast calculation time. The proposed solver is presented at different implementation levels, and its speed and accuracy performance are compared with standard solvers. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
12. Improved 3D electromagnetic analytical model for planar induction heater with consideration of transverse edge effects
- Author
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Messadi, Mohammed, Hadjout, Larbi, Ouazir, Youcef, Bensaidane, Hakim, Takorabet, Noureddine, Lubin, Thierry, and Mezani, Smail
- Published
- 2020
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13. Torque and back-emf in hybrid excited claw pole generator
- Author
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Wardach, Marcin
- Published
- 2018
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14. Analytical approach for spoke-type permanent magnet machine including finite permeability of iron core
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Ladghem Chikouche, Brahim and Ibtiouen, Rachid
- Published
- 2020
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15. Study of an aluminium mixing system based on permanent magnets
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Morev, Andrey and Aliferov, Alexander
- Published
- 2020
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16. A novel saturated open-core fault current limiter and its nonlinear magnetic circuit model
- Author
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Li, Lei and Li, Lin
- Published
- 2017
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17. Guest editorial: Electromagnetic modelling exploiting fields and circuits.
- Author
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Kreischer, Christian, Demenko, Andrzej, Pietrowski, Wojciech, and Hameyer, Kay
- Subjects
COMPUTATIONAL electromagnetics ,ELECTRICAL steel ,PERMANENT magnets ,PARTICLE swarm optimization ,ELECTRIC inductance ,ELECTRIC circuits ,ELECTRIC flux ,INDUCTION motors ,ELECTRIC machinery - Abstract
The paper "Improved Methods for Stator End Winding Leakage Inductance Calculation" presents improved methods for calculating the stator end winding leakage inductance of an IM. The authors used a DC hysteresis measurement and an optimization process to parameterize the hysteresis models, and then the calculated current waveforms of the no-load transformer have been compared with the measured no-load current waveforms to validate the model. The transformer topology models used in the study are: The inductance-reluctance models; and The capacitance-permeance models. The inductance-reluctance model represents the magnetic circuit of the transformer and its stray flux paths as inductances in an electric equivalent circuit, allowing the magnetic and surrounding electrical circuit to be modelled in the electrical domain. [Extracted from the article]
- Published
- 2023
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18. Comparative analysis and optimization design of dual-side-permanent-magnet Halbach array vernier machine for high torque density.
- Author
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Cheng, He, Lin, Fandi, Wu, Jing, and Zhang, Tong
- Subjects
PERMANENT magnets ,FINITE element method ,CHOICE (Psychology) ,INDUCTIVE effect ,TORQUE ,MAGNETS - Abstract
Purpose: The purpose of this paper is to introduce and analyze a dual-side-permanent-magnet Halbach array vernier (DSPMHV) machine and to propose methods for achieving high torque density. Design/methodology/approach: Flux harmonics and torque characteristics are analyzed by using finite element analysis. First, a suitable pole-slot combination is selected by comparison. Second, field modulation processes of DSPMHV machine are analyzed to identify the reason for high torque density. And it is compared with dual-side-PM (DSPM) machine to analyze flux harmonic and verify the flux concentrating effect of the Halbach array. Findings: The permanent magnet (PM) field of the DSPM machine is approximately equal to the superposition of stator-PM field and rotor-PM field, which is the reason for high torque density. And the Halbach array can reduce flux leakage and increase the amplitude of main flux harmonics, then further improves torque. Improvement of torque can be achieved by choosing right pole-slot combination, adopting DSPM machine structure, reducing flux leakage and adopting field modulation principle. Originality/value: The DSPMHV machine with split-tooth is proposed in this paper by combining the Halbach array with DSPM structure. This paper analyzes the bidirectional field modulation process, the reason for high torque density of the DSPM machine is obtained. Comparison with the DSPM machine verifies the flux concentrating effect of Halbach array. To alleviate the magnetic saturation in part of stator teeth, this paper proposes an improved DSPMHV machine with shaped auxiliary magnet. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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19. Novel hybrid excited machine with flux barriers in rotor structure
- Author
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Wardach, Marcin, Palka, Ryszard, Paplicki, Piotr, and Bonislawski, Michal
- Published
- 2018
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20. Permanent Magnet Installation Optimization of Outer Rotor PMSM Depending on Adding Auxiliary Teeth.
- Author
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Su, Jiayin, Nie, Rui, Wang, Peixin, Xu, Shuai, Liang, Jing, and Si, Jikai
- Subjects
PERMANENT magnets ,PERMANENT magnet motors ,SYNCHRONOUS electric motors ,TEETH ,FINITE element method ,ROTORS - Abstract
To reduce the influence of the permanent magnet (PM) installation error on the electromagnetic characteristics of the outer rotor permanent magnet synchronous motor (OPMSM), the rotor structure of the OPMSM is optimized in this paper. The optimization method of adding auxiliary teeth on the surface of the rotor core is studied, and the influence of different auxiliary teeth heights on the electromagnetic performance of OPMSM is analyzed. It is found that adding auxiliary teeth with suitable height can greatly reduce the installation error of the PM, increase the mechanical stability of the motor, and ensure that the electromagnetic characteristics of the motor remain at a good level. Firstly, the topology and parameters of the motor proposed in this paper are introduced and analyzed. Secondly, the influence of PM installation error on the electromagnetic performance of the motor is analyzed based on the finite element method (FEM), and the necessity of eliminating PM installation error is demonstrated. Then, the parametric scanning method is used to analyze the influence of auxiliary teeth height change on the electromagnetic performance of the motor, and the selection standard of the optimal auxiliary teeth height is determined. By comparing and analyzing OPMSM with different sizes and different pole–slot ratios, the universality of the conclusions is demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
21. An Investigation into the Pole–Slot Ratio and Optimization of a Low-Speed and High-Torque Permanent Magnet Motor.
- Author
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Liu, Zhongqi, Zhang, Guiyuan, and Du, Guanghui
- Subjects
PERMANENT magnets ,PERMANENT magnet motors ,TORQUE ,OPTIMIZATION algorithms ,ELECTRIC torque motors ,MANUFACTURING industries - Abstract
At present, low-speed high-torque permanent magnet motors are widely used in the sampling industry, manufacturing industry and energy industry. However, the research on low-speed high-torque permanent magnet motors is far from enough. The primary difficulty in the initial design of low-speed high-torque permanent magnet motors is the selection of pole–slot ratio. The pole–slot ratio has a great influence on the electromagnetic performance such as torque ripple and the maximum output torque of low-speed motors. Choosing the appropriate pole–slot ratio scheme can make the design of a low-speed motor more efficient. In addition, the optimization design of the motor is also a necessary process. At present, there are many studies on optimization algorithms. However, the research on sample point sampling and surrogate model fitting is not enough. Choosing the appropriate sample point sampling method and surrogate model fitting method can help one obtain a more accurate surrogate model, which lays a foundation for the optimization of the motor. Based on the above analysis, this paper first selects four representative pole–slot ratio schemes for comprehensive comparison of their electromagnetic performances. Secondly, two sample point sampling methods and three surrogate model fitting methods are combined to obtain six surrogate models, and the accuracy of the six surrogate models is compared and analyzed. Finally, a 37kW,160rpm prototype is made, and the comparison of the surrogate model optimization prediction results, the finite element simulation calculation results and the measured results is carried out to further prove the accuracy of the selected surrogate model. The work performed in this paper provides a certain reference value for the initial design and optimization experiment design of low-speed high-torque permanent magnet motor. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
22. A novel magnetic circuit and structure for magnetic levitation ruler.
- Author
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Sun, Jiyuan, Li, Pin, Zheng, Yan, Tian, Chunlin, and Zhou, Zhenxiong
- Subjects
MAGNETIC structure ,MAGNETIC circuits ,DISPLACEMENT (Mechanics) ,MAGNETIC measurements ,MAGNETIC suspension ,MAGNETIC cores ,PERMANENT magnets ,PERMANENT magnet motors - Abstract
The single axis linear displacement measurement system of CMM is composed of grating ruler, servo motor and linear motion mechanism. Although the measuring accuracy of grating ruler is high, the accuracy of servo motor and linear motion mechanism is low. Therefore, the complex structure limits the measurement accuracy of the linear displacement measurement system. This paper introduces a novel linear displacement measurement system named magnetic levitation ruler. According to the working principle of grating ruler and the characteristics of magnetic levitation technology, the magnetic circuit design and structural design of magnetic levitation ruler are completed in this paper. The mover core of the magnetic levitation ruler is in the stable working magnetic field provided by the stator yoke. The horizontal control coil wound on the mover core can obtain more stable ampere force to improve the control accuracy of the mover core displacement. Therefore, the mover core can be moved in step mode, and the length of each step is fixed. Each step is the minimum scale of the magnetic levitation ruler. Therefore, the mover core can implement displacement measurement while moving in a linear motion. This paper analyzes the working principle of levitation, horizontal motion, and displacement measurement of magnetic levitation ruler, and determines the structural materials and parameters of magnetic levitation ruler with the help of finite element analysis software. The simulation results show that the levitation force of the magnetic levitation ruler is proportional to the current passing through the levitation coils, and the thrust of the horizontal control coil is less disturbed by the magnetic field. Compared with the linear displacement measurement system with rotational servo motor or permanent magnet synchronous linear motor as the core, the magnetic levitation ruler has stable magnetic field, strong controllability, high integration, and is easier to achieve high-precision control. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
23. Resistive torque in permanent magnet couplings operating through a conductive wall
- Author
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Rezek Matsumoto, Thomas and Chabu, Ivan
- Published
- 2017
- Full Text
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24. Investigation on Overvoltage Distribution in Stator Windings of Permanent Magnet Synchronous Wind Turbines.
- Author
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Li, Shulin, Tian, Fuqiang, He, Haitao, Liu, Hongqi, Zhang, Shifu, and Li, Yudi
- Subjects
ELECTROMAGNETS ,COMPUTATIONAL electromagnetics ,PERMANENT magnets ,WIND turbines ,FINITE element method ,PERMANENT magnet generators - Abstract
The PWM voltage pulses output by the inverter reaches the stator winding of the wind turbine generator through the cable. Due to the impedance mismatch between the motor and the cable, the voltage at the motor end rises under the action of the circuit wave process; on the other hand, electromagnetic oscillation occurs within the motor winding. Higher overvoltage is generated under the combined effect of both, which greatly accelerates the aging and breakdown of the insulation layer of the permanent magnet synchronous wind turbine. In this paper, a three-dimensional electromagnetic model of the permanent magnet synchronous wind turbine generator is established. The distribution circuit parameters of the stator winding of the permanent magnet machine are calculated using the finite element method, and its circuit model is based. The voltage distribution of the stator winding under different PWM excitations is investigated by simulation software, and the effects of the time of the rising edge and the pulse width of the PWM pulse on the stator winding voltage to ground and the turn-to-turn voltage distribution are studied. The results show that the effect of the rising edge time is larger when the rising edge time is shorter, the maximum voltage to ground occurs in the first coil, and the amplitude can be up to 1.5 times of the output voltage. When the rising edge time is longer, the maximum voltage to ground occurs in the end coil, and the amplitude is slightly higher than the output voltage. The trend of turn-to-turn voltage variation is similar for different rising edges; only the maximum turn-to-turn voltage amplitude is different. Pulse width has a small effect on overvoltage and only occurs when the pulse width is less than 10 μs. The research results of this paper are of great significance in revealing the aging and breakdown mechanism of the generator stator insulation, as well as the insulation coordination and design. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Design and Multi-Objective Optimization of an Asymmetric-Rotor Permanent-Magnet-Assisted Synchronous Reluctance Motor for Improved Torque Performance.
- Author
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Xing, Feng, Zhang, Jiajia, Zhang, Mingming, and Qin, Caiyan
- Subjects
RELUCTANCE motors ,PERMANENT magnets ,SYNCHRONOUS electric motors ,FINITE element method ,ELECTROMAGNETIC waves ,SPEED limits - Abstract
Permanent-magnet-assisted synchronous reluctance motors (PMA-SynRMs) are widely used in modern industry as a kind of electromagnetic energy conversion device with high output torque, high power density, high efficiency, and excellent speed regulation. In this paper, an asymmetric-rotor PMA-SynRM combined with a Halbach array is proposed based on the conventional PMA-SynRM without modifying the amount of permanent magnet. With the finite element no-load analysis, it is proven that the permanent magnet arrangement of this method can achieve better flux focusing effect and magnetic-axis-shift (MAS) effect. A significant increase and shift of the air-gap magnetic density has also been observed. Meanwhile, the load simulation demonstrated that the proposed model possesses higher utilization of permanent magnet torque and reluctance torque compared to the conventional model. In addition, a multi-objective optimization has been performed for the rotor structure of the proposed model, and the optimized model improved the average torque by 25.32% and reduced the torque ripple by 76.92% compared to the conventional model. Finally, the constant power speed range (CPSR) performance and anti-demagnetization performance have been analyzed for the three models. The results showed that the proposed and optimized models performed better on constant power speed range, and all three models of permanent magnets had good anti-demagnetization performance. The maximum demagnetization rate of the optimized model is reduced by 13.84% compared to the proposed model at an operating condition of 200 °C and nine times the rated current. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
26. A Hybrid Excitation Variable-Leakage-Flux Machine with Magnetic-Bridge for Electric Vehicle.
- Author
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Ruipan Lu, Xinlong Huang, Zhangqi Liu, and Xiping Liu
- Subjects
FINITE element method ,MAGNETIC fields ,MAGNETIC circuits ,SPEED limits ,PERMANENT magnets - Abstract
A hybrid excitation variable-leakage-flux machine (HE-VLFM) for electric vehicles is presented in this paper, which places the excitation windings on the outer side of the stator and provides an axial magnetic field through the magnetic-conducting ring and magnetic-conducting bridge. The HE-VLFM proposed in this paper has a rotor permanent magnet to provide the main magnetic field and an excitation winding to provide a variable auxiliary magnetic field, which can fulfill the requirements of the electric vehicle drive system with large torque at low-speed and wide speed regulation range. The electromagnetic performance of the proposed HE-VLFM is evaluated using the equivalent magnetic circuit method and three-dimensional finite element analysis, and the results show that the HE-VLFM has a well-developed regulating flux capability. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. Editorial: Recent development in energy conversion systems.
- Author
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Oyedepo, Sunday O., Abam, Fidelis I., Ajayi, Oluseyi O., Samuel, Olusegun D., Borca-Tasciuc, Diana-Andra, and Popoola, Abimbola P. I.
- Subjects
ENERGY conversion ,ENERGY development ,ENERGY harvesting ,PERMANENT magnets ,LEAD zirconate titanate ,AIR gap (Engineering) ,PIEZOELECTRIC materials ,ELECTRICAL energy - Abstract
The article discusses the importance of energy in sustainable development and the need for research and development in energy conversion systems. It highlights the limitations of current energy systems and the goal of achieving sustainable and environmentally friendly energy solutions. The article also provides an overview of a research topic on recent developments in energy conversion systems, including papers on topics such as piezoelectric materials, corrosion control methods, lithium-ion batteries, renewable off-grid mini-grids, and materials for fuel cells. The research topic has received positive responses and has generated significant interest. The article concludes by emphasizing the importance of ongoing research for a more sustainable and energy-efficient future. [Extracted from the article]
- Published
- 2024
- Full Text
- View/download PDF
28. Current optimization-based control of dual three-phase PMSM for low-frequency temperature swing reduction.
- Author
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Linlin Lu, Xueqing Wang, Luhan Jin, Qiong Liu, Yun Zhang, and Yao Mao
- Subjects
SYNCHRONOUS electric motors ,ELECTRIC inverters ,DEMAGNETIZATION ,PERMANENT magnets ,HIGH temperatures - Abstract
In this paper, a control scheme based on current optimization is proposed for dual three-phase permanent-magnet synchronous motor (DTP-PMSM) drive to reduce the low-frequency temperature swing. The reduction of temperature swing can be equivalent to reducing maximum instantaneous phase copper loss in this paper. First, a two-level optimization aiming at minimizing maximum instantaneous phase copper loss at each electrical angle is proposed. Then, the optimization is transformed to a singlelevel optimization by introducing the auxiliary variable for easy solving. Considering that singleobjective optimization trades a great total copper loss for a small reduction of maximum phase copper loss, the optimization considering both instantaneous total copper loss and maximum phase copper loss is proposed, which has the same performance of temperature swing reduction but with lower total loss. In this way, the proposed control scheme can reduce maximum junction temperature by 11%. Both simulation and experimental results are presented to prove the effectiveness and superiority of the proposed control scheme for low-frequency temperature swing reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Project, design and tests of In-wheel outer-rotor PMSM for electric car application. Part 2.
- Author
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SZCZYPIOR, Jan, JAKUBOWSKI, Rafał, BIERNAT, Adam, and RZESZOWSKI, Mateusz
- Subjects
PAPER construction ,PROTOTYPES ,ELECTRIC machines ,ELECTRIC vehicles ,PERMANENT magnets ,SYNCHRONOUS electric motors ,ELECTRIC coils - Abstract
Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
30. Research on Innovative Hybrid Excited Synchronous Machine.
- Author
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Palka, Ryszard, Cierzniewski, Kamil, Wardach, Marcin, and Prajzendanc, Pawel
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RELUCTANCE motors ,SYNCHRONOUS electric motors ,LITERATURE reviews ,ELECTRIC machines ,PERMANENT magnets ,MACHINE performance ,MACHINERY - Abstract
This paper presents research on an unconventional electric machine. It is a hybrid excited machine which includes the features of three types of machines: the Permanent Magnet Synchronous Machine, the Synchronous Machine, and the Synchronous Reluctance Machine. Therefore, a broad literature review related to the above-mentioned types of machines was constructed. The well-known Permanent Magnet assisted Synchronous Reluctance Machine joins features of Permanent Magnet Synchronous Machine and Synchronous Reluctance Machine topologies. This paper shows the results of the innovative design of the Hybrid Excited Permanent Magnet assisted Synchronous Reluctance Machine, which additionally has advantages of the Synchronous Machine. In the article the basic methods of electromagnetic flux control and the designs using them are also presented. Finally, the results of simulation studies of the effect of the stator skew on the machine performance are described. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
31. Design Consideration on a Low-Cost Permanent Magnetization Remanufacturing Method for Low-Efficiency Induction Motors.
- Author
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Zhou, Peng, Xu, Yanliang, and Zhang, Wenji
- Subjects
REMANUFACTURING ,MAGNETIZATION ,PERMANENT magnets ,PERMANENT magnet motors ,MOTORS ,INDUCTION motors ,DESIGN - Abstract
At present, a large number of inefficient induction motors (IMs) are still being used in various industrial fields, resulting in a huge waste of energy. Obviously, it is expensive to replace all these machines with high-efficiency motors. Therefore, this paper will investigate the method of low-cost modification of inefficient IMs and propose a low-cost permanent magnetization remanufacturing (PMR) method that can make full use of the original structure of IMs. The PMR method converts the IM's rotor into a permanent magnet (PM) rotor by directly milling slots in the original rotor and embedding PMs, thus improving the efficiency of the original motor to meet the IE4 standard. Firstly, this paper proposes the PMR process of IM, and based on this process, a Y2-132M1-6 IM is designed for remanufacturing, and the performance of the motor before and after the PMR is compared through finite-element analysis. Then, this paper researches the factors that may affect the starting performance and rated performance of the motor in the PMR design. Finally, based on the PMR design scheme, the Y2-132M1-6 IM is remanufactured into an experimental prototype. The total cost of the PMR is calculated and the performance improvement is tested through experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
32. Investigation of a novel intensifying-flux hybrid excited permanent magnet machine for electric vehicles.
- Author
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Lu, Ruipan, Liu, Zhangqi, Liu, Xiping, Sun, Baoyu, and Liang, Jiangwei
- Subjects
PERMANENT magnets ,FINITE element method ,ELECTRIC machines ,ELECTRIC fields ,MAGNETIC circuits - Abstract
Purpose: To address the issues of the insufficient output torque associated with the application of intensifying-flux permanent magnet (PM) machines in electric vehicles, this paper aims to propose an intensifying-flux hybrid excitation PM machine. It is possible to adjust the air gap magnetic field by adjusting the field current in the excitation winding, thereby increasing the torque output capability and speed range of the machine. Design/methodology/approach: First, a novel intensifying-flux hybrid excited permanent magnet synchronous machine (IF-HEPMSM) is proposed on the basis of intensifying-flux permanent magnet synchronous machine (IF-PMSM) and an equivalent magnetic circuit model is established. Second, the tooth width and yoke thickness of the machine stator are optimized to ensure the overload capacity of the machine while effectively improving the wide flux regulation range. Furthermore, the electromagnetic characteristics of the IF-HEPMSM are investigated and compared with the IF-PMSM and conventional permanent magnet synchronous machine (PMSM) by using finite element simulations. Findings: The i
d of IF-HEPMSM and IF-PMSM is greater than zero low-speed magnetizing current. And the flux-weakening current of the IF-HEPMSM is 18% and 3% smaller than of the conventional PMSM and IF-PMSM. Practical implications: Aiming at the problems of IF-PMSM applied to electric vehicles, this paper proposes an IF-HEPMSM. The air gap magnetic field is adjusted by controlling the current of the excitation winding to improve the reliability of the machine. Therefore, the IF-HEPMSM combines the advantages of high-power density and high efficiency of the PMSM and the controllable magnetic field of the electro-excitation machine, which is of great engineering value when applied in the field of electric vehicles. Originality/value: The proposed IF-HEPMSM offers better flux regulation capability with electromagnetic characteristics analysis and maps of dq-axis current as compared to IF-PMSM and conventional PMSM. Moreover, the improvement of the torque can make up for the shortcomings of the insufficient torque output capability of the IF-PMSM. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
33. Impact of magnet shape and material on the magnet stress.
- Author
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Cao, Li, Hu, Yan, Wang, Bohan, Wu, Wenkun, Shi, Daolong, and Zhuo, Liang
- Subjects
MAGNETS ,STRESS concentration ,STRUCTURAL design ,PERMANENT magnets ,STRAINS & stresses (Mechanics) ,SUPERCONDUCTING magnets - Abstract
Magnet cracking is a common issue in external rotor motors. To investigate the causes of magnet cracking and propose solutions, the authors consider the effects of magnet shape, magnet and yoke material fit on the motor rotor magnets, perform a static analysis of the motor rotor. The simulation and test results show that the stress distribution of tile‐shaped magnets is better than that of rectangular magnets. The highest safety margin of 56.41% is achieved for the magnet and yoke material fit of DT4/N35(EH). The maximum force of the permanent magnet (PM) exceeds 22.38% of the stress limit when the material fit is DT4/SmCo28, which can lead to cracks in the PM. The results of this paper have important reference significance for the structural design of the external rotor motor and their safe and reliable operation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
34. Primary component segmental design to suppress the normal force ripple for the permanent magnet linear synchronous motor.
- Author
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Tan, Qiang, Tian, Bing, Wang, Xinbang, Huang, Xuzhen, and Li, Liyi
- Subjects
SYNCHRONOUS electric motors ,PERMANENT magnets ,REACTION forces - Abstract
There is not only thrust but also normal force between the primary and secondary components for the single‐side flat plate permanent magnet linear synchronous motor (PMLSM). The normal force will fluctuate periodically, which will cause friction perturbation and finally affect the positioning accuracy of linear feed system. For the single‐side flat plate PMLSM, the variation law of normal force ripple under the coupling effect of multiple effects is studied, and the method of primary component segmental design to suppress it is proposed. Firstly, the influence of the cogging effect, the end effect and the armature reaction on the normal force ripple is analysed. Meanwhile the mathematical model of normal force ripple is established. Secondly, the PMLSM with segmental primary component is introduced and its suppression mechanism to the normal force ripple is expounded. On this basis, a scheme combining the non‐integer pole slot matching with the primary component segmental design is proposed to further suppress the normal force ripple. Finally, an 18‐slot 96/5‐pole prototype is taken as an example to carry out the finite element simulation and experimental test, of which the results verify the research theory in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
35. A Thorough Procedure to Design Surface-Mounted Permanent Magnet Synchronous Generators.
- Author
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de Menezes, Gustavo Garbelini, Maciejewski, Narco Afonso Ravazzoli, de Carvalho, Elissa Soares, and Bazzo, Thiago de Paula Machado
- Subjects
SYNCHRONOUS generators ,PERMANENT magnet generators ,PERMANENT magnets ,ELECTRICAL energy - Abstract
This paper sets forth a thorough procedure to design surface-mounted permanent magnet synchronous generators. Since synchronous generators generate the majority of electrical energy, their relevance in society nowadays is substantial. As a consequence, the methodology to design these electrical machines also holds great importance. However, even though a considerable amount of works addresses the matter, it is difficult to find a complete and thoroughly explained design procedure. The proposed method is based on analytical equations to fully consider PM generator fundamentals with a few simplifications, which implies in a considerable number of design equations and parameters. Differently from most papers on the design of PM synchronous generators, a significant level of detail and explanation is presented, all design choices are discussed, and the suggested ranges for the design parameters are shown. This results in a straightforward procedure that allows non-experienced designers to easily replicate the results and effectively enhance the comprehension of permanent magnet synchronous machines, and provides a guideline for researchers from other fields who may need to understand and perform a synchronous generator design. To show the effectiveness of the proposed design procedure, a PM generator is designed, and the results are compared with a finite element simulation, showing good accuracy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
36. A Novel Rotor Harmonic Winding Configuration for the Brushless Wound Rotor Synchronous Machine.
- Author
-
Arif, Farhan, Arif, Arsalan, Ali, Qasim, Hussain, Asif, Imran, Abid, Ullah, Mukhtar, and Khan, Asif
- Subjects
ROTORS ,FINITE element method ,SYNCHRONOUS electric motors ,MACHINERY ,PERMANENT magnets ,OPPORTUNITY costs - Abstract
In the last decade, permanent magnet (PM)-free or hybrid PM machines have been extensively researched to find an alternative for high cost rare-earth PM machines. Brushless wound rotor synchronous machines (BL-WRSMs) are one of the alternatives to these PM machines. BL-WRSMs have a lower torque density compared to PM machines. In this paper, a new topology is introduced to improve the torque producing capability of the existing BL-WRSM by utilizing the vacant spaces in the rotor slots. The new topology has two harmonic windings placed on the rotor which induce separate currents. A capacitor is used between the two harmonic windings to bring the currents in phase with each other. The harmonic winding currents are fed to the rectifier which is also placed on the rotor. Due to additional harmonic winding, the overall field current fed to the rotor field winding has been increased and hence the average torque has also increased. Finite element analysis (FEA)-based simulations are performed using ANSYS Maxwell to validate the proposed topology. The results show that the average torque of the machine has been significantly increased compared to the reference model. The detailed comparison results are provided in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
37. Motion Control of Macro–Micro Linear Platform Based on Adaptive Fuzzy Active Disturbance Rejection Control.
- Author
-
Wang, Mingyi, Kang, Tianrun, Kang, Kai, Zhang, Chengming, and Li, Liyi
- Subjects
ELECTRIC noise ,ADAPTIVE fuzzy control ,SYNCHRONOUS electric motors ,PERMANENT magnets ,REACTION forces - Abstract
To ensure precise positioning of the macro–micro platform with a symmetrical structure, it is crucial to mitigate the impact of various perturbations, including disturbances, as well as complex factors such as external loads, electrical noise, and model parameter variations. This paper proposes a novel macro–micro master–slave control structure that incorporates adaptive fuzzy linear active disturbance rejection control (AFLADRC). The K
p and Kd parameters of the linear state error feedback (LSEF) are dynamically tuned and adjusted using fuzzy reasoning. This approach enhances the robustness of the system and simplifies the tuning process. In addition, this paper also analyzes the symmetry of the coupling effect between macro and micro, as the coupling will affect the motor force and the reaction potential of the motor. The macro–micro platform adopts a symmetric design; the macro stage is driven by a permanent magnet synchronous linear motor (PMLSM), and the micro stage is driven by a voice coil motor. Finally, we built the macro–micro linear motion experimental platform to verify the control effect of the proposed method by conducting trajectory tracking experiments and comparison experiments. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
38. Kinematics-Based Design Method and Experimental Validation of Internal Meshing Screw for High-Viscosity Fluid Mixing.
- Author
-
Guo, Fang, Liu, Genhao, Hao, Yinghai, Ma, Yu, Wu, Guifang, Hou, Zhanfeng, Li, Na, and Li, Xiwen
- Subjects
NON-Newtonian fluids ,CORN syrup ,SCREWS ,ROTATIONAL motion ,CORN flour ,MANUFACTURING processes ,SLURRY ,PERMANENT magnets - Abstract
The challenge of mixing high-viscosity materials is a common issue encountered in the manufacturing process of food materials. The advantages of the internal meshing screw mixer have led to its adoption in various manufacturing processes, but it has yet to be implemented in the food industry. The paper presents a design method for an internal meshing screw mixer based on kinematic principles. The mixer features a helical chamber created by alternating volumes formed by the stator and rotor, establishing an extension-dominated environment for mixing high-viscosity fluids. A kinematic model based on the internal cycloid principle was established, providing trajectories and equations for key points on the rotor, simulating both its rotation and revolution processes, and revealing the velocity variations at different points on the rotor. Based on the kinematic analysis results, a stator and rotor design method was developed according to relevant functional divisions. To achieve the desired motion effects, transmission and support devices were designed, and the relationship between the transmission device and the internal cycloid surface of the fixed rotor was established. The mixer's application and mixing effectiveness in the food industry were validated using corn syrup and flour. Experimental results showed that the extensional mixer described in the paper effectively mixed high-viscosity fluids while also efficiently blending fine powders. Slurry viscosity was tested with a rheometer at different speeds with an eccentric rotor mixer. Results showed that viscosity decreased with increasing shear rate, with a more pronounced decrease at higher shear rates. The apparent viscosity trend remained consistent at different speeds, although variations were observed at lower shear rates, especially concerning speed. The non-Newtonian fluid index exhibited minimal variations at different speeds, while the consistency coefficient showed significant fluctuations. The mixing uniformity index of the slurry was used to evaluate the mixing uniformity and dispersion uniformity of this extensional mixer. At different rotational speeds, the density of the slurry changes little. The uniformity index of mixing decreases gradually with the increase of rotational speed, reaching its maximum at 15 r/min. The overall trend of the uniformity index decreases with increasing rotational speed, indicating a decrease in density uniformity. A peak appears at 45 r/min, possibly due to the maximum values of elongation rate and shear rate at this speed. As the rotational speed increases, the residence time of the material in the mixer decreases, which may be the main reason for the decrease in mixing uniformity. These findings provide valuable insights into the design and utilization of extension-dominated screw mixers within the food industry, laying a solid foundation for future research and practical applications in this field. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
39. Selecting the Best Permanent Magnet Synchronous Machine Design for Use in a Small Wind Turbine.
- Author
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Lefik, Marcin, Firych-Nowacka, Anna, Lipian, Michal, Brzozowska, Malgorzata, and Smaz, Tomasz
- Subjects
SYNCHRONOUS generators ,PERMANENT magnets ,WIND turbines ,PERMANENT magnet generators ,MACHINE design ,MAGNETS ,INDUSTRIAL costs - Abstract
The article describes the selection of a permanent magnet synchronous machine design that could be implemented in a small wind turbine designed by the GUST student organization together with researchers working at the Technical University of Lodz. Based on measurements of the characteristics of available machines, eight initial designs of machines with different rotor designs were proposed. The size of the stator, the number of pairs of poles, and the dimensions of the magnets were used as initial parameters of the designed machines. The analysis was carried out about the K-index, the so-called index of benefits. The idea was to make the selected design as efficient as possible while keeping production costs and manufacturing time low. This paper describes how to select the best design of a permanent magnet synchronous generator intended to work with a small wind turbine. All generator parameters were selected keeping in mind the competition requirements, as the designed generator will be used in the author's wind turbine. Based on the determined characteristics of the generator variants and the value of the K-index, a generator with a latent magnet rotor was selected as the best solution. The aforementioned K-index is a proprietary concept developed for the selection of the most suitable generator design. This paper did not use optimization methods; the analysis was only supported by the K-index. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. The Axisymmetric MRE Actuator in PIR control system.
- Author
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CZOPEK, Paweł and BERNAT, Jakub
- Subjects
INTELLIGENT control systems ,ACTUATORS ,MAGNETORHEOLOGY ,PERMANENT magnets - Abstract
Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
41. A versatilely high fidelity electric machines emulator for rapid testing of motor controller.
- Author
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Guo, Yifeng, Huang, Limin, Zhang, Min, He, Min, Zhong, Bin, and Fan, Dakun
- Subjects
ELECTRIC machines ,HARDWARE-in-the-loop simulation ,PERMANENT magnets ,ELECTRIC machinery ,MOTORS ,TYPHOONS - Abstract
Electric machines emulators (EMEs) based on hardware-in-the-loop (HIL), which effectively act as emulators to mimic the actual motor behavior of Interior Permanent Magnet (IPM) machines. EME is frequently used to evaluate motor controller and motor control methodologies prior to development. The inverse magnetization motor model, which is used as the basis for real-time simulation in this paper's proposal for an electric machine emulator system based on HIL, uses FEA to create the motor model data. The nonlinear features of the motor may be successfully replicated with this motor model, and the accuracy of the electric machine emulator can be enhanced by using a straightforward and trustworthy motor controller. The real-time simulation tool typhoon HIL is used in the study to develop a hardware-in-the-loop simulation platform for an IPM electric machines emulator. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
42. Fault‐tolerant operation for five‐phase permanent magnet synchronous machine drives with five‐phase six‐leg inverter.
- Author
-
Wu, Lijian, Yi, Jiali, Lyu, Zekai, and Hu, Sideng
- Subjects
PERMANENT magnets ,COPPER ,FAULT currents ,MACHINE performance ,MACHINERY - Abstract
Five‐phase permanent magnet synchronous machine (PMSM) can operate under open‐circuit faults with the appropriate current regulations. However, the traditional current regulations based on the five‐phase half‐bridge inverter have to satisfy the constraint of zero neutral point current, which limits the fault‐tolerant performance of the machine. Thus, this paper investigates the current regulation based on the five‐phase six‐leg (FPSL) inverter, which relieves the zero‐neutral point current limitation, and both current regulations considering the maximum torque (MT) and minimum copper loss (MC) are derived under different open‐circuit conditions. The cost of the system has increased, but with the new regulations, better fault‐tolerant operation capability of the machine can be obtained under all kinds of open‐circuit faults. Moreover, with the introduction of the neutral point current, the machine can work under triple‐phase open‐circuit faults. In conclusion, the proposed control scheme based on the FPSL inverter expands the fault‐tolerant operation capability of the five‐phase PMSM. The experiment results prove the effectiveness of the proposed current regulation on increasing average torque or reducing copper loss under fault‐tolerant operation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. Performance improvement of the hybrid switch reluctance motor by notching method.
- Author
-
Hasanzadeh, S., Rezaei, H., and Taheri, H.
- Subjects
SWITCHED reluctance motors ,RELUCTANCE motors ,INFINITE element method ,AIR gap flux ,PERMANENT magnets - Abstract
Hybrid switch reluctance motors belong to the family of Switch Reluctance Motors (SRMs) that attenuate magnetic saturation and increase air gap magnetic flux by exploiting permanent magnets. The auxiliary air gap flux generated by permanent magnets can affect the average torque and ripple. Typically, reducing torque ripple results in a decrease in average torque. This paper focuses on reducing torque ripple and enhancing average torque in a 6/10 pole hybrid switch reluctance motor by inserting two symmetrical notches on its rotor. Also, the lengths of the magnet and rectangular notches are optimized using the infinite element method and sensitivity analysis. A comparison between the optimized design and the initial one, conducted through infiniteelement analysis, proves the eficiency of the proposed model. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
44. A Review of Carbon Emissions from Electrical Machine Materials.
- Author
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Zhang, Xuebei, Gerada, David, Xu, Zeyuan, Zhang, Fengyu, and Gerada, Chris
- Subjects
CARBON emissions ,MACHINING ,GLOBAL warming ,MACHINE design ,GREENHOUSE gas mitigation ,CLIMATE change ,PERMANENT magnets - Abstract
As the world embarks on a global mission to tackle climate change, reducing carbon represents a key challenge given the escalating global warming. The U.K. is among many other nations that are determined to decarbonise all sectors and strive to achieve a net zero carbon target by 2050. While much attention has been paid to improving performance and reducing carbon emissions in electrical machines, the current research landscape focuses mainly on the thermal and electromagnetic facets. Surprisingly, carbon emissions from the production stage, especially those related to raw material consumption, remain a largely unexplored area. This paper wishes to shed light on a neglected dimension by providing a comprehensive review of carbon emissions in the manufacture of electrical machines, thus contributing significantly to the wider discourse on carbon emission reduction by comparing the carbon emission values associated with various materials commonly used for the main components of these machines. A further case study is included to assess and explore the impact of material alterations on a synchronous machine, from a carbon emission perspective. A reliable material guide will provide engineers at the design stage with the critical insight needed to make informed material selection decisions, highlighting the critical role of carbon emission values beyond conventional thermal and electromagnetic considerations, achieving sustainable and environmentally conscious electrical machine design. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
45. A Parameterized Modeling Method for Magnetic Circuits of Adjustable Permanent Magnet Couplers.
- Author
-
Wang, Dazhi, Li, Wenhui, Wang, Jiaxing, Song, Keling, Ni, Yongliang, and Li, Yanming
- Subjects
MAGNETIC circuits ,PERMANENT magnets ,EDDY current losses ,PERMANENT magnet motors ,EDDY current testing ,MAGNETIC flux ,ELECTRIC inductance - Abstract
The contactless transmission between the conductor rotor and the permanent magnet (PM) rotor of an adjustable permanent magnet coupler (APMC) provides the device with significant tolerance for alignment errors, making the performance estimation complicated and inaccurate. The first proposal of an edge coefficient in this paper helps to describe the edge effect with better accuracy. Accurate equivalent magnetic circuit (EMC) models of the APMC are established for each region. Models of magnetic flux, magnetic resistance, and eddy current density are established by defining the equivalent dimensional parameters of the eddy current circuit. Furthermore, the concept of magnetic inductance is proposed for the first time, parameterizing eddy currents that are difficult to describe with physical models and achieving the modeling of the dynamic eddy current circuit. The magnetic resistance is subdivided into two parts corresponding to the output and slip according to the power relationship. Furthermore, eddy current loss and dynamic torque models are further derived. The method proposed in this paper enables the APMC to be modeled and calculated in a completely new way. The correctness and accuracy of the model have been fully demonstrated using finite element simulation and an experimental prototype. In addition, the limitations of the proposed method and the reasons are fully discussed and investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
46. Research on Rotor Loss and Rotor Structure Optimization of Rare Earth Permanent Magnet Synchronous Motors in the Weak Field Area.
- Author
-
Yang, Guohui, Wu, Hao, Wang, Danyang, Zhang, Peng, Jiang, Shuaiqi, and Zhang, Yang
- Subjects
PERMANENT magnet motors ,ROTORS ,PERMANENT magnets ,ACTINIC flux - Abstract
The rotor loss of rare earth permanent magnet synchronous motor (PMSM) affects the efficiency and reliability of the motor and is an important research direction of rare earth permanent magnet synchronous motors. In this paper, the influence of rotational speed on the loss of the rotor core and the permanent magnet is analyzed through the analysis of the motor magnetic field and rotor loss calculation. Specifically, with the increase in rotational speed, the weak magnetic current increases, the amplitude of flux density change in the rotor core decreases, and the loss of the rotor core also decreases. The greater the influence of the harmonic current magnetic field on the outside of the rotor, the greater the loss. The core loss on the rotor is mainly distributed on the outside of the rotor. For further engineering applications, this paper analyzes the loss composition of three kinds of motors with different rotor structures and judges the optimal scheme based on the minimum loss. Finally, the correctness of this research is verified by comparing the experimental and simulation results of two kinds of motors with different rotor structures. The research content of this paper can provide a reference for the loss analysis and optimization and rotor structure selection of rare earth permanent magnet synchronous motor rotor design. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
47. An efficient analytical model and experiments of 3D electromagnetic force of permanent magnet electrodynamic suspension system.
- Author
-
Wu, Chuan, Li, Guanchun, Wang, Dong, and Xu, Jie
- Subjects
ELECTROMAGNETIC forces ,PERMANENT magnets ,MOTOR vehicle springs & suspension ,COMPUTATIONAL electromagnetics ,MAGNETIC fields ,REQUIREMENTS engineering - Abstract
Electrodynamic suspension (EDS) with a linear permanent magnet Halbach array, which can be used in ultrahigh-speed maglev systems, has gained increasing attention in recent years. However, inefficient calculation methods of electromagnetic forces restrict the stability research of EDS systems. Hence, an efficient 3D analytical model of the electromagnetic force is established in the paper based on an improved analytical model of the source magnetic field excited by the Halbach array, and then the application conditions of the model are studied. Finally, the analytical results are compared with the experimental results, which are provided by the experiments carried out on a high-speed rotating experiment platform with a flywheel. The results show that the proposed model can shorten the computation time of electromagnetic force to less than 10 ms and the relative errors of analytical results are around 5% under the conditions ① w p / τ ≥ 2.5 , w d / w p ≥ 1.5 or ② w p / τ ≥ 4 , w d / w p ≥ 1 (τ is the pole pitch of the Halbach array, w p is the width of the permanent magnet, w d is the width of the conducting plate). The analytical model meets the engineering requirements and can provide a reference for further stability research and experiments on EDS systems. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
48. Minimization of detent force in PMLSM by end magnetic regulating module with free topologies.
- Author
-
Xu, Xiaozhuo, Hua, Kai, Feng, Haichao, Jiang, Siyuan, and Zhao, Yunji
- Subjects
- *
OPTIMIZATION algorithms , *SYNCHRONOUS electric motors , *STRUCTURAL optimization , *PERMANENT magnets , *TOPOLOGY - Abstract
In this paper, a novel method for suppressing the detent force of permanent magnet linear synchronous motors is proposed. First, the end force is adjusted to offset the cogging force while the cogging force remains unchanged. On the other hand, the proposed method can arbitrarily change the shape of the end magnetic regulating module (EMRM), thus allowing the end force to obtain a wider adjustment range, which is different from the conventional limited shape optimization. More interestingly, compared to the traditional approach for suppressing the end force, which is to suppress the end force to the lowest level, the proposed method does not necessarily suppress the end force to the lowest level, but rather adjusts it to a reasonable level, so that it can offset the cogging force. This leads to the fact that the optimized end magnetic regulating module is effective in adjusting the end force and may even increase the end force, which is different from the conventional idea of suppressing the detent force. Next, the optimal EMRM's topologies are solved using the optimization algorithm, which replaces the traditional low-dimensional single-direction optimization and performs multi-direction global search. Finally, the prototype with optimal EMRM's topology and the testing platform are established and the experimental results validate the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
49. ANALYTICAL MODEL AND NUMERICAL FINITE ELEMENT MODEL FOR A SUBMERSIBLE SYNCHRONOUS HYDROGENERATOR.
- Author
-
DUMITRU, CONSTANTIN, BUNEA, FLORENTINA, NEDELCU, ADRIAN, TANASE, NICOLAE, and MIHAIESCU, GHEORGHE MIHAI
- Subjects
FINITE element method ,ELECTRIC generators ,PERMANENT magnet generators ,PERMANENT magnets ,OCEANOGRAPHIC submersibles ,TIME-domain analysis ,SUBMERSIBLES - Abstract
The main objective of the paper is to demonstrate the functionality and reliability of a hydrokinetic turbine system -- a submersible electric generator, suitable for very low watercourses. To achieve this goal, it is necessary to design and build a prototype of a hydrokinetic turbine, coupled with an electric generator with excitation made with permanent magnets. This paper presents an analytical model and a finite element numerical model for estimating the electrical parameters of the generator (voltage, current, power, etc.). The two models were compared, and the results were extrapolated, in the analytical model, for several speed values. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
50. Nonmetallic Inclusions in a New Alloy for Single-Crystal Permanent Magnets Original Scientific Paper.
- Author
-
Belyaev, I. V., Bazhenov, V. E., Kireev, A. V., and Moiseev, A. V.
- Subjects
NONMETALLIC materials ,PERMANENT magnets ,MAGNETIC alloys ,COMPUTER simulation ,SOLIDIFICATION - Abstract
The morphology, chemical composition and formation mechanism of non-metallic inclusions in magnetic alloy of Fe-Co-Ni-Cu-Al-Ti-Hf system were investigated. These alloys are used in manufacturing single-crystal permanent magnets. Modern methods for the identification of non-metallic inclusions, as well as computer simulation of the processes of their formation by Thermo Calc software were used in the work. It was found that studied alloy contains (Ti, Hf)S titanium and hafnium sulfides, (Ti, Hf)
2 SC titanium and hafnium carbosulfides, Ti2 O2 S titanium oxisulfide, HfO2 hafnium oxide, and Al2 O3 aluminum oxide. No titanium and hafnium nitrides were found in the alloy. The bulk of nonmetallic inclusions are (Ti, Hf)2 SC carbosulfides and (Ti, Hf)S sulfides. All carbides and many oxides are within carbosulfides and sulfides. When the sulfur content in the alloy is no more than 0.2%, and carbon content does not exceed 0.03%, carbosulfides are formed in the solidification range of the alloy and has an faceted compact form. If the sulfur content in the alloy becomes more than 0.2% and carbon content more than 0.03%, the carbosulfide formation begins before the alloy solidification or at the begining stages of solidification. In this case, carbosulfides are dendritic and coarse. Such carbosulfides actively float in the solidified melt and often come to the surface of the castings. In this case, specific surface defects are formed in single-crystal magnets, which are called sulfide stains. All titanium and hafnium sulfides are formed at the lower part of solidification range and have elongated shape. [ABSTRACT FROM AUTHOR]- Published
- 2018
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