基于高频信号耦合注入的内置式永磁同步电机转子初始位置检测方法

Rotor Initial Position Detection Method of IPMSM Based on High Frequency Coupling Injection

内置式永磁同步电机(IPMSM)受转子凸极性的影响,绕组电感随转子磁极位置呈周期变化。考虑到上述特征,提出一种基于高频信号注入的IPMSM转子初始位置检测方法。将高频信号依次注入定子两相绕组,并提取定子绕组高频信号线电压,运算处理后获得没有考虑转子磁极极性的初始位置角。随后注入脉冲电压矢量进行转子极性判断,从而获得准确的初始位置角。理论分析和试验结果表明,该方法对电阻参数依赖较小,不受逆变器非线性和电流传感器检测精度的影响,能够准确检测转子初始位置角,满足IPMSM平稳起动的要求。

Due to the rotor salient polarity,the winding inductance of the interior permanent magnet synchronous motor(IPMSM)changes periodically with the rotor pole position.Considering this characteristic,a rotor initial position detection method of IPMSM based on high frequency signal injection is proposed.The high-frequency signals are injected into the stator two-phase windings in order,the line voltages of the high-frequency signals of the stator winding are extracted,and the initial position angle without considering the rotor magnetic polarity is obtained after calculation.The pulse voltage vector is injected to judge the rotor polarity,so as to obtain the accurate initial position angle.Theoretical analysis and experimental results show that the method has a little dependence on the resistance parameters,and is not affected by the nonlinearity of the inverter and the detection accuracy of the current sensor,so it can accurately detect the initial rotor position angle and meet the requirements of smooth start of the IPMSM.