永磁同步电动机起动过程控制

Start Process Control of Permanent Magnet Synchronous Motors

为了提高永磁同步电动机驱动系统的起动性能,提出了一种改进的转子初始位置检测方法。基于电机高频电压模型和凸极效应,运用高频注入法,使转子初始位置信号调制到高频载波上,输出信号经过具有正弦鉴相环节的锁相环路检测转子初始位置;对高频注入法和锁相技术相结合推定转子初始位置的方法进行了理论分析,并基于广义预测算法的直接转矩控制方法对起动过程转矩进行控制。实验结果表明,采用的方法是正确可行的,转子位置得到了准确检测,起动过程的速度变化具有较好的平缓控制效果。

In order to improve the start performance of permanent magnet synchronous motor drive system, a modified method which was used to track the rotor position is presented. The high-frequency （HF） injected method and phase locked loop （PLL） are analyzed in the paper. Based on the HF voltage model and the spatial saliency of permanent magnet synchronous motor, HF voltage signal was injected into motor and initial rotor position signal is modulated by high-frequency carrier wave, then the PLL was adopted to track the initial rotor position. Direct torque control based on generalized predictive control was also adopted during start process. Theoretic analysis and experimental results verify the validity of this approach.