基于改进DTC-SVM的永磁同步电机伺服系统研究

The Study of PMSM Servo Control System Based On Improved DTC-SVM

传统的永磁同步电机直接转矩控制方法转矩响应速度快,但转矩脉动大、电流脉动大、开关频率不固定。为此,本文在分析了面贴式永磁同步电机数学模型的基础上,提出一种基于改进DTC-SVM的空间矢量脉宽调制直接转矩控制系统。提出基于Simulink的DTC-SVM伺服系统仿真模型。仿真结果表明,整个系统既保持了传统直接转矩控制的响应速度快的优点,又具有定子电流波形畸变小,转矩脉动小,系统工作稳定,抗干扰性能强的优点。

Traditional direct torque control（DTC） for permanent magnet synchronous motor（PMSM） has the advantage of high rapid torque response,but has the shortages of large torque ripple,large current ripple and inconstant inverter switching frequency.On the basis of an analysis of surface mounted permanent magnet synchronous motor （SPMSM） an improved DTC-SVM system using space vector modulation（SVM） for SPMSM was proposed in the paper so as to solve the problems such as large torque ripple（？） inconstant inverter switching frequency in the conventional direct toque control （DTC） system.And its simulation model was set up.The simulation results show that small current distortion,low torque ripple in full region and keep the advantage of DTC that rapid response with changes of input.The system was stable and had good anti-interference performance.