基于脉振电压法的永磁同步电动机的初始位置检测

摘要

描述了一种通过注入高频脉振电压来估计永磁同步电动机的转子的初始位置的方法.先分析电机在转子坐标系下磁链和电流的非线性饱和特性并用泰勒极数来描述这种特性,再通过分析高频电流响应,其中,交轴电流的基波分量中包含转子的位置信息但存在多解问题,直轴电流的二次谐波分量包含着极性信息可以有效地滤掉无效解.根据该原理设计一个 PI 控制器,可以快速地使估计坐标系逼近到转子坐标系,即交轴电流的基波分量趋向于零,直轴电流的二次谐波分量趋向于最小值,估算出初始位置的真值,从而实现电机转子的初始定位.最后,仿真结果验证了该方法的有效性.%A method was preserted to detect the initial rotor position using oscillating voltage injection for permanent magnet synchronons motors.The Taylor series was used to describe the characteristic of nonlinear magnetic saturation relationship between the current and the flux linkage in rotor reference frame.And through the analysis of high-frequency current response ,the fundamental component of the q-axis current includes the rotor position information but it has multiple solutions, while the second harmonic component of d-axis current contains the polarity information and it can effectively filter out invalid solutions.Then a PI controller was designed shich can quickly make estimate frame approaching the rotor reference frame.The fundamental component of q-axis current tends to zero when the second harmonic component of d-axis current tends to the minimum value.So the true value of the rotor initial position were obtained.Finally, the result of simulation demonstrates the effectiveness of this method.