永磁同步电机初始磁极位置检测方法

Initial magnetic pole position detection method for permanent magnet synchronous motor

根据永磁同步电机相电感的饱和效应,提出了一种恒压源作用下的相电流响应来获得电机初始磁极位置的检测方法,并针对制动器打开瞬间容易出现因磁极位置不准而造成无法定位的问题,对位能性负载提出了一种基于位置环的快速定位法。该方法根据电机实际转动的角度来反向移动给定电流矢量,实现快速定位。最后通过计算不同幅值电流矢量二次定位转过的角度来获得精确的磁极位置。所提方法能够准确获得电机初始磁极位置,可适用于不同类型的永磁电机。实验证明:该控制方法结构简单,易于数字控制实现,同时具有较强的通用性和鲁棒性。

According to the saturation effect of PMSM(Permanent Magnet Synchronous Motor) windings inductance, a novel initial magnetic pole position detection method for PMSM based on the phase current response under constant voltage source is proposed. In order to solve the problem that PMSM cannot remain stationary without brakes because the accurate magnetic pole position is unknown, a fast positioning method based on position loop is proposed for potential energy load. The method moves the given current vector in reverse direction according to the angle of the actual rotation, so as to achieve rapid positioning. Finally, the exact position of the magnetic pole is obtained by calculating the angle of the two positions of the different amplitude current vectors. The proposed method can accurately obtain the initial magnetic pole position and can be applied to different types of permanent magnet motors. Experimental results show that the proposed scheme is simple in structure, easy to implement digital control, and has strong versatility and robustness.