基于扇区优化后的鼠笼电机直接转矩控制  

Direct Torque Control of Squirrel Cage Motor Based on Sector Optimization

作　　者：王小龙 罗振鹏[1] 张思清 王淑玉 WANG Xiaolong;LUO Zhenpeng;ZHANG Siqing;WANG Shuyu(Inner Mongolia Key Laboratory of Electromechanical Control(Inner Mongolia University of Technology),Hohhot 010080,China)

机构地区：[1]内蒙古工业大学内蒙古自治区机电控制重点实验室,呼和浩特010080

出　　处：《微电机》2022年第9期80-88,共9页Micromotors

基　　金：国家自然科学基金资助项目(61763037);内蒙古自治区高等学校科学技术研究项目(NJZY19077);内蒙古工业大学科学研究项目(ZD201718)。

摘　　要：针对传统六扇区直接转矩控制方法应用在鼠笼电机中出现的转矩脉动大、起动阶段磁链响应慢以及定子电流畸变等问题,提出了一种基于扇区优化的鼠笼电机直接转矩控制的解决方案。首先引入三位滞环磁链控制器,接着设计了二十四扇区直接转矩控制方法,最后根据电压矢量在不同位置对磁链与转矩的不同作用效果将二十四扇区再次优化至三十扇区。该方案能够在1+4n(n=0,…,5)扇区,解决当Sgn(ΔT _(e))=0时传统矢量表中不理会磁链需求的问题,并将此扇区分为圆心角为7.5°的两个小扇形,以减小此扇区在Sgn(Δψ_(s))=0时由于转矩需求带来的磁链误差;在3+4 n(n=0,…,5)扇区,解决了因电压矢量选取引起的磁链不平衡与转矩响应较慢的问题。仿真结果表明相对于传统六扇区DTC,基于扇区优化的DTC可明显改善转矩脉动、加快磁链响应,并使定子电流更接近正弦波,改善了传统鼠笼电机DTC系统的性能。Aiming at the problems of large torque ripple,slow magnetic linkage response and stator current distortion in the squirrel cage motor when the traditional six-sector direct torque control method was applied to the squirrel cage motor,a squirrel cage motor based on sector optimization was proposed.First,a three-bit hysteresis flux linkage controller was introduced,and then a twenty-four sector direct torque control method was designed,and the twenty-four sectors were optimized again according to the different effects of the voltage vector on the flux linkage and torque at different positions up to thirty sectors.This scheme can solve the problem of ignoring the flux linkage requirement in the traditional vector table when Sgn(ΔT_(e))=0 in the 1+4 n(n=0,…,5)sector,and divide this sector into the central angle of two small sectors of 7.5°to reduce the flux linkage error of this sector due to torque demand when Sgn(Δψ_(s))=0;in the 3+4 n(n=0,…,5)sector,solve the problem of unbalanced flux linkage and slow torque response caused by voltage vector selection.The simulation results show that compared with the traditional six-sector DTC,the sector-optimized DTC can significantly improve torque ripple,speed up the flux linkage response,and make the stator current closer to a sine wave,improved the performance of the traditional squirrel cage motor DTC system.

关 键 词：直接转矩控制 30扇区电压矢量选择表 转矩脉动 磁链响应 

分 类 号：TM343[电气工程—电机] TP273[自动化与计算机技术—检测技术与自动化装置]