Analysis and Suppression of Static Electromagnetic Ripple Torque in Integrated On-Board Charging System With Rotor Position Error

This article describes a position error compensated ripple torque suppression method (PEC-RTSM) for reducing the vibration of the integrated on-board electric vehicle (EV) charging system caused by the rotor position error in reality. The static electromagnet torque model considering the rotor position error of the multiplexed dual-three-phase permanent magnetic synchronized motor (DTPMSM) is established. Under the constraint condition of the stable grid-side currents, the amplitude and phase angle of each phase current in the stator winding can be regulated by the compensated asymmetric current for achieving a minimum instantaneous torque. Compared with the original methods, the proposed static electromagnetic ripple torque suppression method has the capacity of reducing the torque vibration effectively in a wide rotor position error range, rather than the strict specific position. Besides, the copper loss related with the rotor angle error is also analyzed and calculated. Results indicate that the copper loss increment rate is limited, while the rotor angle error is in the normal range or the rotor position returning loop is employed. This method would improve the reliability of the charging process and extend the application of the integrated on-board charging system. Experimental and simulation results verified the effectiveness of the theoretical analysis.