工程无PG式永磁同步电动机DTC系统  

PMSM DTC System Based on Engineering no-PG

作　　者：陈德传[1] 廖玉忠[1] 陈雪亭[1] 

机构地区：[1]杭州电子科技大学智能控制与机器人研究所,浙江杭州310018

出　　处：《控制工程》2011年第6期982-985,共4页Control Engineering of China

基　　金：浙江省自然科学基金项目(Y1101143);2009年浙江省大学生科技成果推广项目资助(ZX100701044)

摘　　要：针对目前永磁交流同步电动机(PMSM)的直接转矩控制(DTC)系统中存在的低速平稳性差、转矩脉动大,及无速度传感器(PG)式系统精度低等问题,提出采用滑模变结构调节器取代现有的转矩与磁链调节器以提高转矩与磁链的控制性能,并提出一种在电机轴侧用一只接近开关(1P/R)取代PG,利用电机自学习阶段接近开关输出的脉冲频率信号,推算出校正公式,对估计转速进行校准,构成工程(近似)无PG方案以进一步提高系统的软测控性能。分析了该系统的组成原理与设计方法,仿真与分析结果表明新型DTC方法有效减小了转矩脉动并改善了无PG的PMSM-DTC系统的动、静态性能。还简要介绍了该系统在纠偏控制系统作为纠偏执行机构的应用情况。To the problems of direct torque control （DTC） of permanent magnet synchronous machine （ PMSM）, such as poor stability at low speed, torque ripple, and low accuracy in speed sensorless controlling system, a variable structure sliding mode controller is proposed to replace the traditional torque and flux regulation. A proximity switch is installed on the motor shaft to replace the photoelectric encoder （PG）. A compensation formula is calculated by the pulse frequency signal of the proximity switch in the learning phase. The engineering no-PG method of calibrates the speed estimator with the correction formula to enhance soft measurement performance of the system. The principle and design method of the system are analyzed. The simulation results show that the new method can effectively improve the dynamic and static performance of the DTC system. Finally the application of the system in deviation e0nttol system for correcting unit is briefly introduced.

关 键 词：永磁同步电动机 DTC 滑模变结构 工程无PG 参数辨识 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]