基于永磁磁链在线辨识的永磁同步电机无速度传感器控制

在无速度传感器控制条件下,研究了基于MRAS的永磁同步电机永磁磁链在线辨识系统。仅辨识速度和永磁磁链两个参数,使得辨识模型满秩,避免了出现设置不同初值获得不同永磁磁链辨识值的问题,确保了参数估计的收敛性和唯一性。分析了欠秩问题的本质,分别推导了速度和永磁磁链的辨识自适应律。仿真结果表明:该控制系统在转速和负载突变下均能准确跟踪转子的速度,具有良好的鲁棒性和动态性能,同时降低了系统参数敏感性。

Sensorless Control of Permanent Magnet Synchronous Motor Based onIdentification of Permanent Magnet Flux

The permanent magnet flux identification system of permanent magnet synchronous motor based on MRAS under the condition of speed sensorless control was studied. Only the speed and permanent magnetic flux were estimated. It satisfies a identification model of full rank and avoids the problem of different initial values different identification values. The convergence and uniqueness of parameter estimation were also ensured. The essence of the rank deficient problem and deduct the identification adaptive law of speed and permanent magnet flux respectively were analyzied. The simulation results showed that the control system could accurately track the speed of the rotor under the speed and load transient change, and had good robustness, with reduced sensitivity on the parameters.