一种新颖的永磁同步电机转子初始位置检测方法

A Novel Initial Rotor Position Estimation Method for Permanent Magnet Synchronous Motors

当永磁同步电机转子为表贴式且磁路设计饱和程度不明显时,d、q轴电感几乎相等,无法用传统的检测电感的方法来检测转子初始位置。为解决这一问题,提出一种新颖的基于转子微动的方法来检测转子的初始位置。在定子侧给定旋转电压矢量,由此产生的旋转电流矢量会产生脉动转矩。合适的脉动转矩会引起电机的微动,从而影响电机的电流响应。由于脉动的转矩与转子位置相关,因此电流响应中包含电机转子位置的信息。根据电机的数学模型,分析了给定不同频率电压矢量时的电流响应。利用傅里叶分析对电流响应进行计算,可以得到电机的转子位置信息。在搭建的1.25 kW的永磁同步电机实验平台上进行了实验,验证了所提方法的有效性。

When the permanent magnet synchronous（PMSM） is surface mounted and the magnetic saturation is not obvious,the inductances of dq-axes are almost the same,the traditional methods based on measuring the inductance cannot be used.In order to solve the problem,a novel initial rotor position estimation method based on rotor micro-movement is proposed.A rotating voltage vector is imposed on the stator,and the pulsating torque would be produced due to the generated rotating current vector.Rotor micro-movement would emerge with appropriate pulsating torque,and it will affect the current response.As the pulsating torque is concerned with the rotor position,the rotor position information would be contained in the current response.According to the model of the motor,the current responses under voltage vector with different frequencies are analyzed in this paper.Fourier analysis is used to calculate the current response,and the rotor position is obtained.Experiments are done on a built 1.25 kW PMSM platform,and the effectiveness of the proposed method is verified.