Optimal design and performance analysis of a variable flux flux-intensifying permanent-magnet motor

被引：0
作者：
Liu X.-P. [1 ]
Zhu W.-J. [1 ]
Guo G.-S. [1 ]
Liang J.-W. [1 ]
机构：
[1] School of Electric Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2023年 / 27卷 / 02期
关键词：
finite element analysis; flux-intensifying; multi-objective optimization; permanent-magnet motor; temperature rise characteristics; variable flux;
D O I：
10.15938/j.emc.2023.02.013
中图分类号：
学科分类号：
摘要：
Aiming at the problem that the flux of permanent-magnet motor is difficult to adjust and permanent magnets are vulnerable to irreversible demagnetization when it is running under heavy load, a type of negative salient pole variable leakage flux permanent magnet motor is proposed. The leakage flux of the motor can be adjusted automatically with the change of load, and the special structure of the rotor increases the d-axis inductance of the motor, thus effectively enlarging the speed range of the motor. Under heavy load, the motor can operate in the flux-intensifying region, which greatly reduces the risk of demagnetization of permanent magnets. Firstly, the rotor structure of the motor was optimized by using multi-objective genetic algorithm. Then the basic electromagnetic characteristics of the motor, such as air gap flux density, no-load back electromotive force, output torque, torque fluctuation, inductance and flux linkage, were studied in detail by using the finite element method. In addition, the mechanical strength and temperature rise characteristics of the motor were also analyzed. The results show that after optimization, the output torque of the motor increases from 55. 20 N·m to 57. 38 N·m, the torque ripple decreases from 5. 62 N·m to 4. 35 N·m, third harmonic amplitude decreases from 11. 87 V to 7. 00 V, and the maximum temperature of the motor decreased from 62. 8 ℃ to 57. 9 ℃. The maximum running speed of the proposed motor is over 10 000 r/ min, which is much higher than that of the conventional motor(7 200 r/ min), which verifies the effectiveness of the optimization method and the feasibility of the motor. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：120 / 132
页数：12
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