多相永磁同步电机PWM技术

Study of the PWM technology of multiphase permanent magnet synchronous motor

摘要:

为了解决在多相电机控制系统中普遍存在的谐波问题,找到合适的PWM技术以减少多相电机控制系统中的谐波畸变,分析了几种适用于多相电机控制的PWM技术的原理,研究了最大矢量SVPWM,空间多维矢量SVPWM和基于载波的多相PWM技术,给出了这些PWM技术的推导过程与实现方法,并利用十五相永磁同步电机的矢量控制系统的Matlab／Simulink仿真模型,对不同的PWM技术进行仿真．仿真结果表明,采用基于载波的多相PWM技术的电机控制系统电流谐波含量小,控制性能好．

Abstract:

In order to solve the harmonic issues that exist in multiphase motor systems normally, and find the appreciate approach PWM technology for decreasing the total harmonic distort (THD), this paper studied several PWM technologies which can be used in multiphase motor’s control systems: the maximum vector SVPWM, the space multidimensional vector SVPWM and the carrier-based multiphase PWM, the principle and the implement method of these PWM technologies were given. This paper analyzed the 15-phase permanent magnet synchronous motor control system by Matlab／Simulink model, the simulation results indicated that the motor phase current which used the carrier-based multiphase PWM has lowest content of harmonics and better performance.