基于滑模变结构的PMSM的直接转矩控制

分析了永磁同步电机(PMSM)数学模型,设计了一种新颖的基于空间矢量脉宽调制技术的直接转矩控制(SVM-DTC)系统.利用两个PI控制器分别调节磁链和转矩实现对电机空间矢量中转矩和磁链2分量的解耦,同时,采用基于转子位置和定子电流的定子磁链估算方法观测定子磁链,并设计滑模变结构无速度传感器来估算转子位置.仿真与实验结果表明,所提出的方法能有效地估算定子磁链与转速,减小电磁转矩和定子磁链脉动,从而使系统具有很好的动、静性能.

Direct Torque Control of PMSM Based on Sliding Mode

Based on the analysis of the mathematical model of permanent magnet synchronous motor(PMSM),a new direct torque control system based on space vector pulse width modulation technique(SVM-DTC) is proposed.The stator flux and torque were regulated by PI controllers to decouple motor space vector in the two components of stator flux and torque.Meanwhile,a stator flux estimation method based on rotor position and stator current was used and sensorless was designed to estimate the rotor position.Simulation and experiment results have shown that the proposed method can effectively estimate the stator flux and reduce the electromagnetic torque and stator flux ripple,so the system has good static and dynamic performances.