Research on Speed Loop PI Oscillation Detection Method

In order to detect whether the speed of a permanent magnet synchronous motor oscillates in real time, a speed loop PI oscillation detection method is proposed. The speed oscillation fault is judged by analyzing the feedback speed data and the observed speed data and the difference data set of the two. The observed speed data is obtained using a reduced-order state observer. Sliding average filtering is performed on the feedback speed data and the difference data to well suppress periodic disturbances and improve smoothness for high frequency oscillation systems. Simulations show the effectiveness of this speed oscillation detection method.