永磁同步电机直接转矩控制系统的仿真研究

Simulation of direct torque control system of permanent magnet synchronous motor

文章分析了永磁同步电机直接转矩控制的原理,阐述传统直接转矩控制系统转矩脉动的缺点,本文将空间矢量脉宽调制技术引入永磁同步电机的直接转矩控制系统中,利用空间矢量的调制过程,可在相同的系统硬件条件下得到更多的、连续的电压空间矢量,进而得到对电机更准确的控制。仿真结果表明,该方案既保持了直接转矩控制快速动态响应,又减小了电机转矩的脉动。

Firstly, the paper analyzes the principle of direct torque control of permanent magnet synchronous motor and elaborates the impact of space voltage vector of the stator flux and the electromagnetic torque. Secondly, the paper introduces direct torque control of permanent magnet synchronous motor SVPWM technology. Under the same hardware conditions, the system can obtain more continuous voltage space vector by taking advantage of SVPWM, The simulation results show the program not only keeps the direct torque control fast dynamic response, but also reduce the motor torque ripple.