永磁同步电机的一种转矩估计算法分析

Analysis of a Torque Estimation Algorithm for Permanent Magnet Synchronous Motor

转矩估计的前提是磁链观测,采用改进的电压法对磁链进行观测。考虑到定子电阻的影响,对基于dq轴方程的模型参考自适应系统的辨识方法进行了详细的计算分析,并发现该电阻辨识算法具有收敛值不唯一的可能,而仅使用q轴方程的辨识算法能克服这一问题。在此基础上建立了基于矢量控制的永磁同步电机系统仿真模型,并验证了算法的有效性。

Flux observer is the premise of torque estimation, the improved voltage method is applied in this paper. This algorithm is affected by stator resistance. The Model Reference Adaptive System （MARS） method based on the dq-axis equations is analyzed in detail. The problem is that the convergence value of this identification algorithm is uncertain. And the simplified algorithm using only q-axis equation can resolve this problem. A vector-control scheme of permanent magnet synchronous motor is proposed and the simulation is verified.