Study On Minimization Of The Torque Ripple Of In-wheel Motors For Electric Vehicle

Electric vehicle has series of advantages, such as high operating efficiency and low pollution. It's a good way to work out the problems of energy and environment protection. In-wheel motor is the essential part of an automobile, BLDCM,it draw more and more attention in the area of electric vehicle because of its excellent reliabilities high efficiencies. The biggest shortcoming of BLDCM is torque ripple. Its main element is torque ripple caused by current. Electric vehicle drived by BLDCM in-wheel motors doesn't have gearbox transmission device.It needs to increase staor current in order to start or increase torque what will increase the torque ripple and hinder driving of electric vehicle.To solve this problem, a new digital control system of electric vehicle's with DSP is presented. It adopts fuzzy PID current compensation relay technique, four in-wheel motors are derived independently. This system can reduce the effect of torque ripple on electric vehicle's driving.This reserach gives a detail description of the control system of in-wheel motor, which contain the constitution of hardware, DSP peripheral circuits, driver and inverter circuit. The system is modeled by using Matlab simulation soft. A drive control system experimental platform is designed for experimental use. The validities of the anticipatory method is strongly supported by the simulink and experimental results.