电励磁集中式定子绕组同步电机的性能对比分析

doi:10.16180/j.cnki.issn1007-7820.2021.12.004

摘要/Abstract

摘要：

为了降低转矩波动,文中研究了不同槽/极比和气隙均匀程度对电机转矩波动的影响。分别在相同的尺寸、转速、激励情况下,对极数为12槽10极、18槽10极、30槽10极的电励磁集中式绕组电机进行性能分析。首先对不同的槽/极比的电机进行有限元分析,再对比分析电机气隙均匀程度对其齿槽转矩的影响。通过比较发现适当的槽/极比可以降低齿槽转矩和反电势的谐波含量,而且从齿槽转矩的大小来看,分数槽电机要低于整数槽电机。使用非均匀气隙可以减少气隙磁密谐波含量,从而进一步降低齿槽转矩,降低了转矩波动。经过有限元计算,分析了这3种电机的电感和对转矩的影响。最后,发现非均匀气隙对降低电机转矩波动的效果更明显,12/10电机转矩波动百分比从10.6%降到了4.2%。

关键词: 集中式绕组, 槽/极比, 有限元分析, 转矩波动, 齿槽转矩, 非均匀气隙, 反电势, 谐波含量

Abstract:

To reduce the torque ripple, this study investigates the effect of different slot/pole ratios and air gaps on the torque ripple of the motor. Under the same size, same speed, and the same excitation, the performance analysis of the electric excitation concentrated winding motor with 12/10, 18/10, 30/10 is carried out. First, the finite element analysis of the motors with different slot/pole ratios is performed and the influence of the uniformity of the air gap of the motors on the cogging torque is comparatively analyzed. Through comparison, it is found that an appropriate slot/pole ratio can reduce cogging torque and the harmonic content of back EMF, and from the perspective of cogging torque, fractional slot motors are lower than integer slot motors. The use of non-uniform air gap can reduce the content of air gap magnetic density harmonics, therefore further reducing cogging torque and torque ripple. After finite element calculation, the inductance of these three kinds of motors and their influence on torque are analyzed. Finally, it is found that the non-uniform air gap has a more obvious effect on reducing the torque ripple of the motor. The torque ripple percentage of the 12/10 motor has been reduced from 10.6% to 4.2%.

Key words: concentrated winding, slot/pole ratio, finite element analysis, torque fluctuation, cogging torque, non-uniform air gap, back EMF, harmonic content

中图分类号:

TN273

彭兴来,李正. 电励磁集中式定子绕组同步电机的性能对比分析[J]. 电子科技, 2021, 34(12): 19-24.

PENG Xinglai,LI Zheng. Comparative Analysis of Performance of Electric Excitation Concentrated Winding Motor[J]. Electronic Science and Technology, 2021, 34(12): 19-24.

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参数	数值
定子外径/mm	120.0
定子内径/mm	85.0
转子外径/mm	84.0
转子内径/mm	18.7
气隙厚度/mm	0.5
电机长度/mm	76.0
定子每槽匝数(12槽)	230
定子每槽匝数(18槽)	154
定子每槽匝数(30槽)	94