基于脉振高频注入的PMSM无传感器控制

传统的永磁同步电机(PMSM)无传感器驱动控制技术在低转速时, 由于反电动势幅值低, 所以存在转子角度误差大, 抖振现象严重等问题。为在各类PMSM的运行工况中均能得到转子的位置信息, 详尽分析了PMSM的数学模型, 提出了一种脉振高频电压信号注入策略。通过在估计的直轴中注入高频电压激励, 以构建交直轴电感差异的凸极效应, 通过检测交轴的高频电流响应以提取出转子误差信息, 实现了转子位置的实时追踪。理论分析和仿真结果均表明, 该策略能够准确辨识永磁转子的实时角度位置, 适用于PMSM的各类工况, 在瞬时增减负载时, 表现出较强的鲁棒性。

Sensorless Control of PMSM Based on Pulsed High-Frequency Injection

Aiming at the problems of the traditional sensorless drive control technology of permanent magnet synchronous motors(PMSM) at low speeds due to the low back-EMF amplitude, the large rotor angle error, and the severe chattering phenomenon, in order to obtain the rotor position information in all kinds of PMSM working conditions, the mathematical model of PMSM is analyzed in detail, and a high-frequency pulse vibration voltage signal injection strategy is studied.By injecting high-frequency voltage excitation into the estimated straight axis, the salient pole effect of the difference in inductance between the orthogonal axis and the orthogonal axis is constructed.By detecting the high-frequency current response of the orthogonal axis to extract the rotor error information, real-time tracking of the rotor position is achieved.Theoretical analysis and simulation results show that the strategy can accurately identify the real-time angular position of the permanent magnet rotor, and is suitable for various working conditions of permanent magnet synchronous motors.It shows strong robustness when the load is momentarily increased or decreased.