Optimal Design of No-Load Airgap Flux Density of Permanent Magnet Synchronous Motor
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摘要: 为改善永磁同步电机的反电势波形,通过分析径向式V型磁体结构永磁同步电机的空载气隙永磁磁密波形和改变极靴形状获得偏心气隙,采用不均匀气隙改善气隙磁场波形,并用有限元软件分析了偏心距为15.2、20.2、25.6、35.6和50.6 mm时的气隙磁场波形及其对应的谐波含量,获得了气隙磁场波形畸变率与偏心距之间的关系曲线,得出了最优偏心距.电磁场的数值计算和实测结果表明,通过优化偏心设计,样机空载的反电势波形接近理想正弦波,相应的总谐波畸变率为0.5%,永磁同步电机的空载气隙磁密波形得到了改善.Abstract: To improve the back-EMF(electromotive force) waveform of PMSM(permanent magnet synchronous motor),the waveform of no-load airgap flux density of radial V-shaped magnet configuration of PMSM was analyzed.The eccentricity airgap was got by changing the pole shoe’s shape.Asymmetric airgap was used to improve the waveform of airgap magnetic field.The waveform of the airgap magnetic field and the harmonic content were analyzed with the finite element method under the eccentricity of 15.2,20.2,25.6,35.6 and 50.6 mm to obtain the eccentricity-airgap flux filed curve and the optimal eccentricity.Numerical calculation and measured results of electromagnetic field show that through the optimal design of eccentricity,the back-EMF waveform of no load is close to sinusoidal distribution and the total harmonic distortion is 0.5%,as a result,the waveform of no-load airgap flux density gets improved.
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