一种新型永磁同步电动机滑模变结构直接转矩控制系统

传统的转矩和磁链双滞环型永磁同步电动机直接转矩控制系统具有转矩脉动大、开关频率不恒定、运行噪音大等缺点.为此,论文基于滑模变结构理论及空间电压矢量调制技术,提出一种新型永磁同步电动机直接转矩控制策略.根据永磁同步电动机定子磁链定向坐标系中的数学模型及滑模变结构理论推导出定子磁链及转矩控制律.实验结果显示新型直接转矩控制...

A Novel Sliding Mode Variable Structure Direct Torque Control for Permanent Magnet Synchronous Motor Drive System

To solve the problems associated with conventional direct torque control (DTC) with toque and stator flux hysteresis controllers for permanent magnet synchronous motor (PMSM) such as the larger ripple of torque, the higher operation noise and the variable switching frequency, a novel sliding mode variable structure DTC strategy for PMSM is proposed, in which the PMSM mathematical model in stator flux orientated coordinate and the space voltage vector modulation are used. The control rule for the stator flux and torque are analyzed based on the sliding mode variable structure theory. The experiment results show that the ripples in torque and stator flux of the presented DTC are reduced while the response of torque is quicker than the conventional DTC, and the current waveform is very smooth. The novel PMSM DTC drive is insensitive to the changes of parameters.