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Your search keyword '"Ji, Jinghua"' showing total 30 results
Start Over Author "Ji, Jinghua" Journal ieee transactions on industrial electronics
30 results on '"Ji, Jinghua"'

5. Investigation of Winding Configuration on Electromagnetic Vibration in Modular Dual Three-Phase PM Machine

Author

Zhao, Wenxiang, He, Qingjun, Tian, Wei, Sun, Yuhua, and Ji, Jinghua

Abstract

This article investigates the effect of winding configuration on the electromagnetic vibration of the 48-slot/8-pole modular dual three-phase (DTP) permanent magnet (PM) machine. First, two winding topologies are discussed based on the phase shift principle, and their phase shift angles are 30° and 60°, respectively. Second, the armature magnetomotive force (MMF) of different winding configurations is derived and compared. The modular DTP-PM machine with 30° phase shift produces the extra 2nd, 18th, 22nd, 26th, and 30th armature MMF harmonic components compared with the 60° phase shift one. Afterward, the electromagnetic force density and radial concentrated force of two modular DTP-PM machines are investigated. The result reveals that the modular DTP-PM machine with 30° phase shift induces the non-negligible 2nd-order vibration under the load condition. This is different from the modular DTP-PM machine with a 60° phase shift which mainly induces 0th-order vibration. Furthermore, the multiphysics field finite-element method is used to calculate the static deformation and vibration acceleration of two modular DTP-PM machines. Finally, the prototype of a 48-slot/8-pole modular DTP-PM machine with a 30° phase shift is manufactured. The experiments are conducted to validate the theoretical analysis.

Published
2024
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6. A Novel Discrete EMN for Electromagnetic Force and Vibration Computation of SPM Machine Considering Carrier Harmonics

Author

Zhao, Wenxiang, Liu, Tong, Ji, Jinghua, Zhu, Shengdao, and Cao, Donghui

Abstract

This article proposes a discrete equivalent magnetic network (EMN) for electromagnetic force and vibration computation of surface-mounted permanent magnet (SPM) machines considering carrier harmonics. First, a new triangle permeance element is proposed and adopted for air-gap meshing of a 12-slot/10-pole SPM machine. Second, the discrete modeling method is applied in the rotor with eccentric magnets of the machine. The proposed method can decouple the relationship between the number of permeances and the transient solution step size in the interface region. Third, this method uses the current dataset involving carrier harmonics as input excitation to calculate the electromagnetic force. Then, the vibration response is synthesized by electromagnetic force and vibration transfer function. Finally, the computation accuracy and efficiency of this method are validated through the finite element method and experimental test.

Published
2024
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22. Design and Optimization of a Fault Tolerant Modular Permanent Magnet Assisted Synchronous Reluctance Motor With Torque Ripple Minimization.

Author

Xu, Meimei, Liu, Guohai, Chen, Qian, Ji, Jinghua, and Zhao, Wenxiang

Subjects
FAULT tolerance (Engineering), SYNCHRONOUS electric motors, PERMANENT magnets, ELECTRIC torque motors, RELUCTANCE motors
Abstract

This article proposes a new asymmetric modular permanent magnet assisted synchronous reluctance motor (PMaSynRM) to offer low torque ripple and high reliability. First, the stator is segmented into three modules without magnetic coupling. The influence of flux gaps between modules is investigated on torque performance. For the torque improvements, the multilevel optimization strategy is conducted, which simultaneously enhances the fault-tolerant capability. Besides, the torque ripple reduction methods are proposed with the asymmetric rotor and shifted end-slots. The analytical formulae of asymmetric flux barrier angle are derived. Then, the asymmetric flux barrier is designed to reduce the 12th harmonic, and the end-slots are shifted to minimize the additional 2nd harmonic component caused by flux gaps. Finally, the enhanced fault-tolerant capability of the proposed modular PMaSynRM is also evaluated. The effectiveness of the proposed approach is verified by both simulation and experiment. [ABSTRACT FROM AUTHOR]

Published
2021
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