基于磁路饱和的永磁同步电机初始位置角检测方案

Initial Rotor Position Estimation for Permanent Magnet Synchronous Motor Based on Magnetic Circuit Saturation

在永磁同步电机的永磁体和绕组流过电流时产生的磁势共同作用下,定子铁芯会产生饱和效应,导致绕组电感发生变化,当有高频电压信号注入绕组时,电感变化最终会反映到电流响应幅值上。该文详细推导了定子电流幅值与转子初始角、注入电压信号初相角的函数关系,通过检测电流幅值即可计算出转子初始角,接着利用永磁体和绕组磁势共同作用下电感的变化规律,检测出转子NS极性。该方案无需额外的电机参数,在静态下即可完成初始位置角计算和N、S极性判断。最后在一台内嵌式永磁同步电机上验证了该方案的正确性与可行性。

The magnetic saturation of the stator core caused by perm magnetic potential together, lead to changes in winding inductan impulse voltage is injected into the winding, the magnitude of the be reflected in the magnitude of the current response. In this pape the stator current amplitude and the rotor position , the initialp anent magnet and winding ce, when a high frequency inductance will eventually r, the relationship between hase angle of the injected impulse voltage is deduced in detail, and the initial position can be calcu magnitude of the three-phase current, in order to distinguish the NS polar winding magnetic potential on magnetic saturation should be considered. lated by detecting the ty the influence of the This scheme does not require additional motor parameters, complete initial position estimation and N and S polarity judgment at standstill. Finally, the correctness and feasibility of the scheme are verified on an interior permanent magnet synchronous motor.