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| Multi-Physics Coupling Analysis of Permanent Magnet Claw Pole Machine with Hybrid Cores by Inverter Power Supply |
| Liu Chengcheng1, Du Handong1,2, Lei Gang3, Wang Youhua1, Zhu Jianguo1,4 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Electrical Engineering Hebei University of Technology Tianjin 300130 China;
2. State Grid Tangshan Power Supply Company Tangshan 063000 China;
3. School of Electrical and Data Engineering University of Technology Sydney Ultimo NSW 2007 Australia;
4. School of Electrical and Information Engineering University of Sydney Sydney NSW 2006 Australia |
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Abstract The stator core of the permanent magnet claw pole machine (PMCPM) is typically made of soft magnetic composite material (SMC). SMC has defects such as high eddy current loss at low frequency, low magnetic permeability, and poor mechanical strength. In addition, because of the high cost of manufacturing large-sized SMC cores, previous designs for PMCPM were often based on low-power motors. If SMC is combined with other materials, using hybrid cores can improve PMCPM performance and reduce manufacturing costs. However, research on PMCPM with hybrid cores is limited to electromagnetic fields. Various physical fields inside the motor are coupled, and a multi-physics coupling analysis should be used to comprehensively study the impact of hybrid cores.
Compared with traditional PMCPM with SMC cores, the paper studies the impact of inverter power supply on the performance of PMCPM with hybrid cores and summarizes the advantages of hybrid cores. Firstly, the electromagnetic performance of PMCPM with hybrid cores is analyzed using the field-circuit coupling method. The temperature distribution of PMCPM with hybrid cores under different power supply modes is obtained, and the influence of the power supply mode is studied. Then, a comparison is made between PMCPM with hybrid cores and PMCPM with SMC cores from the perspectives of electromagnetic field, temperature field, and stress field. Finally, the simulation results are validated through prototype experiments.
The multi-physics coupling simulation analysis shows that under rated conditions, the torque ripple of the motor is 22.5% when powered by the inverter and only 10% when powered by the current source. The inverter power supply greatly increases the torque ripple, increasing the iron and permanent magnet eddy current losses by 22.2% and 44%, respectively. Compared with the PMCPM with SMC cores, hybrid cores reduce the maximum compressive stress on the SMC part of the stator core by 34.1% and the material cost of the motor by 21.6%.
The following conclusions can be drawn. Compared with the current source power supply, the inverter power supply increases the losses of the motor, especially iron loss and permanent magnet eddy current loss. At the same time, it affects the waveform of the motor torque but has little effect on the torque amplitude and temperature distribution of the motor. The no-load and load characteristics of PMCPM with hybrid and SMC cores are almost the same, and their losses and temperature distributions are also very close. Compared to PMCPM with SMC cores, PMCPM with hybrid cores has higher mechanical strength and lower costs.
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Received: 17 February 2024
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2025, Vol. 40 
