内置式永磁电机齿槽转矩削弱方法研究
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1.山东理工大学 交通与车辆工程学院;2.潍坊市电机一厂有限公司;3.山东哈普沃动力科技股份有限公司

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TM351; TM359.9

基金项目:

国家自然科学( 52275261); 山东省自然科学( ZR2020QE155)


Research on cogging torque weakening method of built-in permanent magnet motor
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Affiliation:

1.Shandong University of technology,Zibo;2.Weifang Electric Motor Factory Co Ltd,Weifang;3.Shandong Hapvoo Power Technology Co Ltd,Zibo

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    摘要:

    为抑制永磁同步电机齿槽转矩,减少电机振动与噪声,提出一种定子齿顶开辅助槽与转子外圆偏心的结构来抑制齿槽转矩,提升电机的输出性能。建立了定子齿顶开槽前后与主气隙分布函数解析式,分析定子开槽与电机主磁场分布及齿槽转矩的关系,同时分析了转子外圆偏心后对齿槽转矩的影响。以内置3相8极48槽V型永磁同步电机为例,利用有限元法对定子齿顶辅助槽个数、槽宽、槽深、槽位置以及转子外圆偏心距等参数进行优化对比分析,获得最优的参数匹配。结果表明:定子齿顶双矩形对称开槽以及转子外圆偏心的方式能有效改善主气隙磁场分布,抑制电机齿槽转矩,优化后的电机气隙磁密5,11,15,17谐波幅值下降明显,电机齿槽转矩峰值降低了59.6%,反电势波形正弦性增强,平均转矩提升,电机输出性能明显改善。

    Abstract:

    In order to suppress the cogging torque of permanent magnet synchronous motor and reduce the vibration and noise of motor, a structure of stator tooth jacking auxiliary slot and rotor outer circle eccentricity is proposed to suppress the cogging torque and improve the output performance of motor. The analytical formula of the distribution function of the stator tooth top before and after slotting and the main air gap is established. The relationship between the stator slotting and the main magnetic field distribution and the cogging torque of the motor is analyzed. At the same time, the influence of the rotor outer circle eccentricity on the cogging torque is analyzed. Taking the built-in 3-phase 8-pole 48 slot V-type permanent magnet synchronous motor as an example, the number of auxiliary slots on the stator tooth top, slot width, slot depth, slot spacing and rotor outer circle eccentricity are optimized and compared by using the finite element method, and the optimal parameter matching is obtained. The results show that the double rectangular symmetrical slotting on the stator tooth top and the eccentricity of the rotor outer circle can effectively improve the magnetic field distribution of the main air gap and restrain the cogging torque of the motor. The harmonic amplitude of the optimized air gap magnetic density 5, 11, 15 and 17 decreases significantly, the peak value of the cogging torque of the motor decreases by 59.6%, the sine of the back EMF waveform increases, the average torque increases, and the output performance of the motor is significantly improved.

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  • 收稿日期:2022-04-18
  • 最后修改日期:2022-09-24
  • 录用日期:2022-09-28
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