Harmonic Weakening Analysis of No-load Induced Electromotive Force of Tangential Permanent Magnet Synchronous Motors
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摘要: 针对切向永磁同步电机空载感应电动势谐波含量高会增加杂散损耗的问题,提出一种优化定子槽参数和转子极面偏心设计相结合的方法,以改善空载感应电动势波形。推导出切向永磁电机空载谐波感应电动势表达式,分析并确定了影响空载感应电动势谐波的关键结构参数,以降低空载感应电动势畸变率为优化目标,采用有限元法分析定子槽口宽度、定子槽高度和转子极面偏心距三个参数对电机空载感应电动势各奇次谐波和波形畸变率的影响规律,获得了最优参数。结果表明,优化后的电机能有效削弱空载感应电动势谐波、降低波形畸变率,同时提高气隙磁密、减小齿槽转矩,提升电机整体性能。Abstract: Aiming at the problem that high no-load induced electromotive force harmonic content of tangential permanent magnet synchronous motor will increase stray loss, a method of optimizing stator slot parameters and rotor pole face eccentric design was proposed to improve the no-load induced electromotive force waveform. Expression of no-load harmonic induced electromotive force of tangential permanent magnet motor was deduced, and the key structural parameters affecting no-load induced electromotive force harmonics was analyzed, and the distortion rate of no-load induced electromotive force was determined as the optimized object to be reduced. The finite element method was used to analyze the three parameters of stator slot width, stator slot height and rotor pole face eccentricity to how affect the odd harmonics and waveform distortion rate of the no-load induced electromotive force of the motor, and then the optimal parameters was obtained. The simulation results show that the optimized motor can effectively weaken the no-load induced electromotive force harmonics, reduce the waveform distortion rate, increase the air gap magnetic density, reduce the cogging torque, and finally improve the overall performance of the motor.
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表 1 电机参数
参数 参数值 参数 参数值 额定电压/V 72 转子铁心外径/mm 106 额定功率/kW 5 定子铁心内径/mm 106.8 额定转速/(r·min−1) 3000 定子铁心外径/mm 216 额定转矩/(N·m) 16 电机轴向长度/mm 91 表 2 A相空载感应电动势谐波幅值
谐波次数 幅值/V 谐波次数 幅值/V 1 47.91 11 4.38 3 9.93 13 3.35 5 1.45 15 0.44 7 0.46 17 0.03 9 0.11 19 0.02 -
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