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With its advantages of good torque and speed characteristics, high-speed dynamic response, the brushless DC motor is gradually becoming the first choice for electric vehicles. In order to effectively solve the brushless DC motor control problems caused by the non-linear characteristics, so that this type of motor can be preferably applied in electric vehicles. In this study, according to the nonlinear characteristics of brushless DC motor, the mathematical model is established. Rotating speed and current dual-loop control is selected as the control strategy, The control system is analyzed and simulated, the simulation model of the drive motor is established in the MATLAB/Simulink. And dynamic driving characteristics of the motor are analyzed. The simulation results show that mathematical model is accurate. In this design, no static speed difference can be realized and the motor can be quickly started and broke. The study has great significance in improving the electric vehicle dynamic performance and battery efficiency, as well as increasing the driving range.

Design of Brushless DC motor Drive System for Electric Vehicle Applications