关键词: 永磁同步电机, 定子电阻辨识, 直接转矩控制, 直流注入法

Abstract:

For the variation of the stator resistance in permanent magnet synchronous machine (PMSM) during the operation. A resistance identification method was presented for the PMSM based on direct torque control (DTC). According to the relationship between the electromagnetic torque and the current, the DC bias current in the stator winding could be excited by superimposing the reference electromagnetic torque. The DC signal could be injected into the stator windings of the PMSM. The DC components of the voltage and current were applied to calculate the stator resistance. The method did not interfere with the normal operation of the PMSM and did not involve changes in the hardware. The simulation model was built and the simulation results verify the effectiveness of the proposed method.

Key words: permanent magnet synchronous machine, stator resistance identification, direct torque control, DC injection method