无速度传感器永磁同步电机直接转矩控制系统

摘要

The direct torque control theory has achieved great success in the control of induction motors.However, in the DTC drive system of Permanent Magnet Synchronous Machine (PMSM) proposed a few years ago, there are many basic theoretical problems that must be clarified.This paper describes an investigation about the effect of the zero voltage space vectors in the DTC system of PMSM and points out that if using the zero voltage space vectors rationally, not only can the DTC system be driven successfully but also the torque ripple is reduced and the performance of the system is improved.This paper also studies the sensorless technique in the DTC system of PMSM and configures the DTC system of PMSM with sensorless technique including zero voltage space vectors.Numerical simulations and experimental tests have proved the theory correct.In the condition of sensorless, the DTC system of PMSM is wide-rangely speed adjusting, and the ratio of speed adjustment is 1∶100.%详细阐述了零矢量在永磁直接转矩控制系统中的作用,指出如果合理应用零矢量,不仅能使永磁电机(PMSM)的DTC系统正常运行,而且能减少转矩脉动的频率和改善系统的性能.还研究了PMSM的DTC系统的无速度传感器技术,构建了包含零矢量在内的无速度传感器PMSM的DTC系统.仿真和实验都证明了理论的正确性.在无速度传感器的条件下,PMSM的DTC系统实现了宽范围调速,调速比达到了1∶100.