Control Strategy Study Of Permanent Magnet Synchronous Motor Used In HEV And RCP In The Loop Simulation

The permanent magnet synchronous motors are being used in the hybrid carsfields more widely, and the significance of the control system for permanent magnetsynchronous motor are also more outstanding. A motor controller directly determinesa hybrid car’s power performance and riding comfort. This article considers that thetraditional double closed loop direct torque control exist ripple defects of torque androtating speed, and adopts a control strategy based on fuzzy zero voltage vector actingtime to improve the direct torque control strategy based on the “985Engineering”project of Hunan university and Key laboratory open fund project of Jiangsu province.The main innovational points and research work are as follows:(1) Taking the permanent magnet synchronous motor in a12m hybrid bus ofone bus company as the research object, the article built its nonlinear mathematicalmodel in the two phase static coordinate system (α-β coordinate system) based on theanalysis of the magnetic circuit. The simulation model of a double closed loop directtorque control strategy was built in MATLAB/Simulink. The model proved to beaccurate through the simulation analysis, and that the shortcoming of the traditionaldouble closed loop direct torque control was pointed out.(2) Considering the characteristic of energy feedback for HEV, optimization wasdone on the direct torque controlling voltage vector table. The time control module ofzero voltage vector was added on the basis of double closed loop direct torque control,and the fuzzy controller for time control module of zero voltage vector was created.The result of off-line simulation to direct torque control of fuzzy optimal voltagevector table, based on MATLAB/Simulink, showed that rated torque and speedfluctuation of the permanent magnet synchronous motor could be greatly reduced dueto the improved direct torque control strategy.(3) The test platform for Rapid Control Prototype, based on direct torque controlstrategy of fuzzy optimal voltage vector table was established with the use of dSPACEreal-time simulation system, and the test proved the validity of improved direct torquecontrol strategy to the permanent magnet synchronous motor.