Title: Optimal regenerative braking torque of permanent-magnet synchronous motor in electric vehicles

Authors: Dongmei Wu; Yang Li; Jianwei Zhang; Changqing Du

Addresses: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130033, China; Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070, China ' Technical Center of Dongfeng Commercial Vehicle, Wuhan 430056, China ' State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130033, China ' Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070, China

Abstract: This study investigated a method to determine the optimal regenerative braking torque with maximum energy recovery at given speed, which is essential for the regenerative braking control of electric vehicles. The method is based on the loss modelling of a permanent-magnet synchronous motor (PMSM) system, which consists of electric motor and inverter. The system-loss model is established based on a PMSM mathematical model including iron loss and is used to derive the optimal regenerative braking torque symbolic formula. In addition, the parameter sensitivity of the optimal regenerative braking torque is analysed and a method for online parameter identification is used to obtain the actual parameter values in real time. Thus, the accuracy and adaptability of the optimal regenerative braking torque during the motor-operation process is improved. The analysis results are validated through simulation and bench tests.

Keywords: regenerative braking torque; PMSM; permanent-magnet synchronous motor; loss model; parameter sensitivity; EV; electric vehicle.

DOI: 10.1504/IJHVS.2020.108733

International Journal of Heavy Vehicle Systems, 2020 Vol.27 No.3, pp.359 - 386

Received: 10 Apr 2017
Accepted: 06 Oct 2017
Published online: 30 Jul 2020 *

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