Torque Observation and Improved Sensorless Control of Hub Motor for Armored Vehicles

doi:10.3901/JME.2021.18.252

Abstract

Abstract: A sensorless control strategy for permanent magnet synchronous motor(PMSM) is developed to improve the operation reliability of the electric drive armored vehicle. Aiming at the problem that the traditional high frequency pulse injection method contains multiple filters, complex algorithms and redundant programs, an improved position identification method is proposed, which saves the software and hardware resources of the control system. In addition, in order to optimize the dynamic torque following performance of hub motor, a torque observation method based on full-order sliding mode observer is proposed to observe the torque in real time. On this basis, a sensorless control system of hub motor based on torque given is built, and the rapid control prototype experiment is carried out. The results show that, compared with the traditional frequency pulse injection method, the improved method also has good identification performance and can ensure the stable operation of the motor under various working conditions. The designed torque observer has high identification accuracy and the observation error is basically controlled within 1%. The overall torque control performance of the motor is good. In stable operation, the error between the actual torque and the given torque is kept within 2%, which can meet the high-performance control requirements of hub motors.

Key words: permanent magnet synchronous motor(PMSM), position sensorless, improved frequency pulse injection method, full-order sliding mode observer, torque observation

CLC Number:

TM301

ZHAO Qijin, WEI Shuguang, LIAO Zili, MIAO Chenglin. Torque Observation and Improved Sensorless Control of Hub Motor for Armored Vehicles[J]. Journal of Mechanical Engineering, 2021, 57(18): 252-263.

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