考虑电感不对称的多单元永磁同步电机转子初始位置检测  

Initial Rotor Position Detection for Multi-unit Permanent Magnet Synchronous Motor Considering the Asymmetry of Stator Inductances

作　　者：刘自程 石松 蒋栋 曲荣海[1] LIU Zicheng;SHI Song;JIANG Dong;QU Ronghai(School of Electronics and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei Province,China)

机构地区：[1]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2022年第8期3004-3012,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52077088)。

摘　　要：多单元电机是多三相电机的一种,其定子绕组由多个三相绕组单元构成,由于各单元的三相绕组沿电机圆周依次分布,各单元内的三相电感值呈现不对称性。该文以一台四单元永磁同步电机为对象,指出互感的差异是电感不对称的主要原因,分析电感值的不对称会给转子初始位置的检测带来误差,并给出考虑电感不对称的转子初始位置检测方法。在基于线电感的脉冲电压注入法基础上,提出对线电感检测值的修正方法,消除电感不对称性对转子定位的影响。实验结果表明,运用所提方法对线电感检测值进行修正后,转子初始位置的最大检测误差从12.4°减小到3.2°,有效提高多单元永磁电机的转子初始位置检测精度。The multi-unit machine is one type of the multi-three-phase machines, whose stator windings are composed of multiple three-phase units. Because multiple units of three-phase stator windings are distributed sequentially around the circle, the three-phase inductances within one unit are no more symmetrical. Taking a four-unit permanent magnet synchronous motor(PMSM) as an example, this paper pointed out that the asymmetry of inductances is due to the unequal mutual inductances, then explained why the asymmetric inductances may bring errors to the detection of the initial position of the rotor, and proposed an improved method to detect the rotor initial position considering the asymmetry of stator inductances. Based on the pulse voltage injection into stator windings, a modification method was proposed for the measured values of line inductance, which aims to eliminate the influence of inductances asymmetry on rotor position. The experimental results show that the proposed method can reduce the maximum detection error of the initial position from 12.4° to 3.2°, which effectively improves the detection precision of the rotor initial position for the multi-unit PMSM.

关 键 词：多单元永磁同步电机 电感不对称 线电感 脉冲电压 转子初始位置 

分 类 号：TM351[电气工程—电机]