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Your search keyword '"Fractional-slot winding"' showing total 4 results
Start Over Descriptor "Fractional-slot winding" Topic finite element method
4 results on '"Fractional-slot winding"'

1. Analysis and Design of Dual Three-Phase Fractional-Slot Permanent Magnet Motor With Low Space Harmonic.

Author

Guo, Liyan, Xu, Jiaqi, Wu, Shuang, Xie, Ximing, and Wang, Huimin

Subjects
*PERMANENT magnet motors, *EDDY current losses, *PERMANENT magnets, *FINITE element method, *STATORS
Abstract

There are many space harmonics in the stator magnetomotive force (MMF) of fractional-slot concentrated winding (FSCW). These harmonics will produce high eddy current losses in the permanent magnet (PM), which will reduce motor efficiency and affect motor performance. Aiming at the above problems, the harmonic components of traditional stator MMF are first analyzed in this article, and then, a novel space-shifted unequal-turn winding structure is proposed for dual three-phase fractional-slot permanent magnet synchronous motors (PMSMs). Meanwhile, the sub- and super-harmonics in the stator MMF can be simultaneously eliminated using the proposed winding structure. To verify the effectiveness of the proposed structure, an 18-slot/8-pole motor and a 30-slot/14-pole dual three-phase fractional-slot PMSM with low space harmonic are designed by using the proposed space-shifted unequal-turn winding structure based on the analysis of nine-slot/eight-pole and 15-slot/14-pole motors. Finally, by comparing the finite element analysis (FEA) results, it is verified that the dual three-phase PMSM motor with the proposed structure has smaller eddy current losses in PM and better motor performance. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Demagnetization Assessment of Fractional-Slot and Distributed Wound 6-Phase Permanent Magnet Machines.

Author

Patel, Vipulkumar I., Wang, Jiabin, and Nair, Sreeju S.

Subjects
*DEMAGNETIZATION, *PERMANENT magnet motors, *PHASE transitions, *ELECTRIC windings, *SHORT circuits, *FINITE element method
Abstract

A 6-phase fractional-slot-per-pole-per-phase interior permanent magnet (IPM) machine having a novel topology of 18-slot, 8-pole and a 6-phase, 48-slot, 8-pole IPM with distributed windings, both designed for a segment-A electric vehicle, are assessed for the risk of partial irreversible demagnetization under various fault conditions. This paper describes a more accurate approach of demagnetization assessment based on 2-D transient finite-element analysis. It is shown that due to the presence of low-order space harmonics in the fractional-slot IPM machine, the demagnetization risks across all pole pairs are different. Compared with the distributed wound machine, the fraction-slot machine is less vulnerable to demagnetization due to relatively high winding inductance, although its demagnetized regions are not uniform in each pole. It is also shown that although the demagnetizing current of one 3-phase short-circuit (SC) is greater than that of 6-phase SC, the resultant demagnetization risk is lower than that of 6-phase SC in the fractional-slotmachine. [ABSTRACT FROM AUTHOR]

Published
2015
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3. Switched-flux machines with hybrid NdFeB and ferrite magnets.

Author

Afinowi, I. A. A., Zhu, Z. Q., Guan, Y., Mipo, Jean-Claude, and Farah, P.

Subjects
*MAGNETIC control, *NEODYMIUM compounds, *FERRITES, *BRUSHLESS electric motors, *ELECTRIC motor efficiency, *FINITE element method, *MAGNETIC flux density, *DEMAGNETIZATION
Abstract

Purpose – The purpose of this paper is to comparatively study the conventional, i.e. single magnet, and novel hybrid-magnet switched-flux permanent-magnet (HMSFPM) machines. Design/methodology/approach – The HMSFPM machines utilize two magnet types, i.e. low-cost ferrites and NdFeB. Thus, a set of magnet ratios (?), defined as the quotient of the NdFeB volume to the total PM volume, is introduced. This allows any desired performance and cost trade-off to be designed. Series- and parallel-excited magnet configurations are investigated using 2-dimensional finite element analysis. Findings – The torque of the HMSFPM machines is lower than the NdFeB SFPM machine but the flux-weakening performance is improved for similar machine efficiency. If the machine dimensions are unconstrained, the HMSFPM machines can have the same torque for reduced material costs and a moderate increase in machine dimensions. Ferrite SFPM machines have the lowest cost for the same torque but a significant increase in machine dimensions is required. Finally, the series-excited HMSFPM machine is the preferred over the parallel-excited HMSFPM machine because it has superior demagnetization withstand capability. Research limitations/implications – Mechanical and winding eddy current losses are not considered in the efficiency map calculations. Originality/value – The NdFeB SFPM, ferrite SFPM, series-excited HMSFPM, and the parallel-excited HMSFPM machines are compared for their electromagnetic performance, flux-weakening, PM demagnetization, efficiency, and material costs. [ABSTRACT FROM AUTHOR]

Published
2016
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4. The Comparative Analysis of Permanent Magnet Electric Machines with Integer and Fractional Number of Slots per Pole and Phase

Author

A.I. Sogrin, Sergey Gandzha, and I.E. Kiessh

Subjects
Engineering, business.industry, Phase (waves), Cogging torque, Finite element analysis, Torque ripples, General Medicine, Finite element method, Magnetic field, Fractional-slot winding, Quantitative Biology::Subcellular Processes, Direct torque control, Control theory, Magnet, Torque, business, Permanent magnet motor, Engineering(all), Integer (computer science)
Abstract

The comparison of permanent magnet motors with integer and fractional number of slots per pole and phase was made. The torque developed by the motor and the torque ripples level were chosen as the major criterions. The comparison was made according to the results of equations of numerical calculation of magnetic field in active motors volumes using the finite element analysis. The recommendations on the choice of the most suitable option are given.

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