Equivalent Inductance-based Flux Observer for Tri-Three-phase PMSM Sensorless Control

In the tri-three-phase permanent magnet synchronous motor (TTPMSM), the performance of the sensorless control strategy is greatly affected by the coupling between phases. In this paper, an equivalent method is used to simplify the mutual inductance of each three-phase in TTPMSM and decouple the system parameters. A rotor flux observer is proposed based on the equivalent inductance, with a phase-locked loop (PLL) added to get the speed information from the flux linkage. The proposed strategy is simple and able to achieve a good effect. The performance of the proposed sensorless method is verified by simulation.