Speed estimation of six phase PMSM based on a super twisting sliding mode observer

DOI:	10.11809/bqzbgcxb2023.02.025
Keywords:	six phase permanent magnet synchronous motor; super twisting sliding mode observer; Lyapunov stability; rotating coordinate system; positionless sensor control system
Abstract:	Aiming at a high frequency buffering caused by the traditional sliding mode observer in the six phase PMSM positionless sensor control system of a military wheel hub, and steady state error caused by phase lag of the estimation coordinate system on the estimated speed, this paper proposes a speed estimation algorithm based on a super twisting sliding mode observer. In the rotating coordinate system, the high frequency buffering is suppressed by the super twisting algorithm, and the counter electromotive force is observed. A Lyapunov function is constructed to analyze the stability of the current dynamic error equation, and the influence of the estimated phase lag of the rotating coordinate system on the speed estimation error is considered. According to the structural characteristics of the super twisting sliding mode control algorithm, a speed estimation algorithm considering d axis estimation of counter electromotive force is proposed. Simulation and experiments show that the speed estimation algorithm based on a super twisting sliding mode observer has higher estimation accuracy. It can suppress high frequency chattering in the system, reduce the influence of the phase lag in the estimation coordinate system on the speed estimation error, omit the low pass filter and the phase compensation module, and improve the accuracy of speed estimation.
Published:	2023-02-28
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