| The BLDCM is a new motor which consists of the stator, a rotor, winding,position sensors, primarily. It has not the mechanical structure which is consisting ofthe brush, and the commutator, yet. Its characteristics is high efficiency, simplestructure, small size, high efficiency, high reliability, etc. With the development ofpermanent magnetic materials, electronic technology and new control theory, thebrushless DC motor has a broad application prospects.This paper introduces the present situation of the development of regenerativebraking system, analysis of the development of the motor. Through the study andanalysis the structure and characteristics reversible of BLDCM(Brushless directcurrent motor), build a model of BLDCM, more in-depth understands of the drivingperformance of electric vehicles.To improve the driving range of regenerative braking system, according to aBLDCM driving characteristics, we use unilateral chopping method and PWM controlto study the control section of the regenerative braking system. The control center isDSP2812, design of the control circuit, main circuit, the driving circuit and detectioncircuit, When the brake generated, through PWM controls the turned on and off of themain circuit power tube, and detecting the DC bus voltage, when the DC bus voltageis greater than the battery voltage, then tocharge for the battery, then to reach thebrake energy recovery effect. According to energy feedback control system theory ofBLDCM, we build the model of simulationby Matlab, and programming the controlsystem program, then we take the test on the DSP control platform.In this paper, in order to verification the control systems of the BLDCM energyregenerative braking, we take a test for the regenerative braking system of theBLDCM based DSP, Verify the feasibility, stability and ease of debugging of thebrushless DC motor control system. |
