Optimal energy consumption and torque fluctuation control of integrated electric drive system based on mechanical-electromagnetic-thermal coupling characteristics

Abstract

Integrated electric drive system (IEDS) is a strong nonlinear electromagnetic-mechanical-thermal multi-field coupled system. Owing to the action of multi-field coupling, the traditional control strategy not only fails to fully exploit the performance of IEDS, but also reduces the adaptability and increases torque ripple. To solve this problem, this paper proposes an improved control strategy, in the multi-coupling field, which can reduce energy consumption and torque fluctuation of IEDS based on the torque, speed and temperature three-parameter query table. Firstly, the mechanical-electromagnetic-thermal coupling dynamic model is established in the coupled field-circuit simulation, moreover its performance is studied at different temperatures using traditional control strategy. Special attention is given to the defects of the traditional control strategy with respect to motor energy loss and torque fluctuation control in the multi-coupling field and the development of new strategies to overcame these defects. Simulation and experiments show that, compared with the traditional control strategy, the proposed control strategy can not only improve the efficiency of IEDS by 3.61% under mechanical-electromagnetic-thermal coupling, but also reduce the torque fluctuation caused by current harmonics and improve the dynamic adaptability.