Study on the Influence of Current Unbalance for Three-Phase Open-Winding Permanent Magnet Synchronous Motor Based on Linear Drive

This paper focuses on the issue of amplitude deviation and constant offset in the motor winding currents, which are caused by non-ideal factors such as variations in device parameters and changes in device parameters during the lifetime in the linear drive circuit of a three-phase open-winding permanent magnet synchronous motor (OW-PMSM). The influence of unbalanced three-phase current on motor torque and speed is studied. By deriving the effect of the deviation amount on the dq0 axis currents based on the mathematical model of OW-PMSM, the analysis further examines the effect on output electromagnetic torque. A closed-loop simulation system for the linear drive of OW-PMSM is developed using PSIM simulation software to verify the influence of unbalanced current on the closed-loop control system and analyzes the simulation results. These findings provide valuable insights for practical applications of linear drive system and future research on three-phase OW-PMSM.