基于空间矢量脉宽调制的永磁同步电动机直接磁链控制

针对永磁同步电动机电流矢量控制及传统直接转矩控制的缺点,提出了一种基于定子磁链直接控制的速度和转矩控制策略,通过直接控制定子磁链矢量的轨迹来实现磁链和转矩的控制,具有恒定开关频率及转矩和磁链脉动较小等优点,并给出了直接磁链控制应用的必要条件.仿真证明,提出的控制方案适用于恒转矩区和弱磁区的控制,且在较宽的速度运行范围内改善了速度和转矩控制的动态响应,明显优于传统的电流控制方案.

Direct flux control of permanent magnet synchronous motors based on space vec-tor pulse width modulation

To overcome some shortcomings in current vector control(CVC) and basic direct torque control,a new speed and torque control strategy based on direct flux control(DFC) was presented.In this method,the flux and torque are controlled through directly controlling the trajectory of stator flux vector.It has some advantages such as fast dynamic response,constant switching frequency,reduced torque and flux ripple.The necessary condition for direct flux control to a permanent magnet synchronous motor(PMSM) was put forward.Simulation results show that the strategy not only operates well in the constant torque range,but also in the flux weakening range,and it improves fast dynamic response of speed and torque control over wide speed operation,better than the traditional current vector control.