永磁同步电机转子初始位置的静止型估计

Initial rotor position estimation for permanent magnet synchronous motor at standstill

针对传统永磁同步电机转子初始位置静止型辨识方法的注入频率过高和电流不可控等问题,提出了一种基于正弦电流注入的估计方法。在电流闭环控制的基础上,当给定子注入正弦电流时,永磁同步电机的凸极效应与转子磁极方向的非线性磁路饱和特性使得电流环控制器输出电压中含有转子磁极位置信息与极性信息,可分别用于转子磁极的初次辨识角度估计和极性判断。该方法消除了定子电阻与电感的影响,降低了注入正弦电流的频率要求,且可控的定子电流有效防止因电流过大而损坏变频器或因电流过小而影响估计精度。内嵌式永磁同步电机Matlab仿真和永磁同步电梯曳引机实验均验证了该方法的可行性。

On account of the problems of traditional methods for initial rotor position identification in permanent magnet synchronous motors （ PMSMs） at standstill, such as high injection frequency and uncon-trollable current, an estimation strategy based on sinusoidal current injection was proposed. As stator current is closed-loop controlled, when a sinusoidal current is injected into stator, the output voltage of current controllers contains rotor position and polarity information, which are used for primary rotor angle estimation and magnetization polarity direction of initial rotor position. The impact of stator resistance and inductance was eliminated, and the injected current frequency limitation was reduced by the proposed strategy. Additionally, well-controlled stator current effectively prevented inverter damaging from too large current and avoided low estimation accuracy caused by too small current. Both Matlab simulation on interior PMSM and experiment on surface-mounted permanent magnet synchronous elevator traction machine verified the strategy＇s efficiency.