开关磁阻电动机的优化设计与控制策略

Optimal Design and Control of the Switched Reluctance Motors

开关磁阻电动机的定子和转子的双凸极结构以及非线性电磁特性,导致了电机有较大的转矩脉动,直接影响了电机驱动系统的输出特性。同时大的振动和噪声阻碍了开关磁阻电机的推广应用,由于定子的径向振动是开关磁阻电机噪声的主要根源,因此研究定子振动系统的模态分析是降噪的有效手段。本文分析了开关磁阻电动机的基本原理,通过优化极弧系数降低了电机转矩脉动,并利用三维有限元模态分析,计算出电机定子的固有频率,最后比较分析了降低电机转矩脉动的控制策略。

The doubly salient structure and non-linear electromagnetic properties of switched reluctance motor(SRM)stator and rotor determine the torque ripple in SRM drive system.The torque ripple directly affects the output characteristics of drive system.Considerable vibration and acoustic noise limit the application of SRMs.As the radial vibration of stator is the origin of the acoustic noise of SRMs,model analysis of stator vibration is the effective way to the research for low acoustic noise.This paper analyzes the basic principle of the SRM,and reduces its torque ripple by optimizes pole arc coefficient.Three-dimension finite element model analysis is adopted in this paper to analyze and compare the inherent frequencies of SRMs.At last several control strategies of the torque ripple suppression are introduced and compared.