基于高频正交方波电压注入的永磁同步电机初始位置辨识

Rotor Initial Position Identification Based on the HF Orthogonal Square-Wave Voltage Injection

传统高频方波电压注入法辨识内置式永磁同步电机的转子初始位置时,存在多个零点,闭环调节收敛时间长,无法准确辨识磁极极性等问题,导致电机起动失败甚至反转。为此,提出一种基于高频正交方波电压注入的转子初始位置辨识方法。该方法将正交方波信号注入静止坐标轴,利用其高频响应电流辨识转子磁极位置后,再通过在直轴注入低频正弦电流信号辨识磁极极性。该方法的磁极位置信号不需要通过闭环调节获得,可直接通过求反正切获取,响应快,工程实现容易。最后在 1.5kW IPMSM 驱动系统上进行实验,实验结果表明本文所提出方法准确且有效。

In the field of interior permanent magnet synchronous motor(IPMSM) rotor initial position identification, the conventional methods are possible to lead a long convergence process or even a wrong convergence due to multiple zero points, and the magnetic polarity cannot be identified, so that the motor starts failure or even reverses. Therefore, a rotor position identification method based on high frequency(HF) orthogonal square wave voltage injection is proposed in this paper. Firstly, the HF voltage signals are injected into the stationary reference frame(SRF), and then the HF response currents in the SRF are used to identify the rotor magnetic pole position. Secondly, a low-frequency sinusoidal current signal is injected into d-axis to identify rotor magnetic polarity. Because the rotor position can be obtained directly by arc tangent function in this method, it does not need long time to converge. Finally, the proposed method is verified on the 1.5kW IPMSM system.