基于载波频率成分的永磁同步电机转子定位研究

Research on rotor position of permanent magnet synchronous motor based on carrier frequency component

针对传统永磁同步电机(PMSM)无位置传感器控制中转子定位可能反相、低速时转子位置精度差等问题,研究一种基于载波频率成分法的转子定位方法。在分析载波频率成分法原理的基础上,利用逆变器固有的含载波频率成分的电流信号,通过建立新的坐标系,将电流信号经带通滤波处理得到载波频率成分电流,用滤波后的峰值电流估算出转子位置。分别在Matlab/Simulink和基于DSP的硬件平台中对该方法进行仿真和实验验证。实验数据表明,载波频率成分法转子计算误差在合理范围内,在电机启动和低速阶段也能很好地估算出转子位置,该方法能准确估算出转子位置。

An approach to locate the rotor position based on carrier frequency component is proposed aiming at the problems of reverse phase and poor accuracy at low speed of rotor position in traditional PMSM sensorless control. Based on analyzing the theory of carrier frequency component method, using the inherent current signal which contains the carrier frequency component of the inverter, it establishes a new coordinate system, then processes the current signal by the band-pass filter to obtain the carrier frequency component current, and estimates the rotor position by using the peak of filtered current. The simulation with MATLAB/Simulink and the experiment based on DSP hardware platform are used to verify the method. The experimental data shows that the rotor calculation error of the carrier frequency component method is within reasonable limits, and the proposed method also estimates the rotor position at start-up and low-speed stage excellently, so it is accurate.