電動(dòng)車用無刷直流電機(jī)低速特性的研究
[Abstract]:In order to solve the problem of global oil resource depletion and increasingly serious environmental pollution, electric vehicles emerge as the times require. As far as the performance index of electric vehicle is concerned, the motor and control strategy play a very important role, which has been studied for a long time by domestic and foreign scholars. Brushless DC motor (BLDCM) has been applied to more and more fields because of its advantages of high efficiency, low power consumption and simple structure. Therefore, the operation system of brushless DC motor with direct torque control is studied in this paper, and the low-speed performance of electric vehicle is simulated and analyzed. Firstly, based on the basic structure of brushless DC motor, the working principle, mathematical model and motor characteristics of brushless DC motor are introduced in detail. Secondly, aiming at the disadvantage of large torque ripple in the low speed operation of brushless DC motor, the control methods are compared and analyzed. On the basis of analyzing the theory of direct torque control, the model of direct torque control of brushless DC motor is established by taking Matlab/Simulink simulation software as the platform, and the simulation modules are introduced in detail, and the simulation wave diagram is obtained. Compared with the waveform of vector control method, direct torque control (DTC) not only has good dynamic response ability, but also can restrain torque ripple effectively. Finally, according to the whole vehicle parameters and dynamic performance index, the transmission system and the driving motor parameters of the electric vehicle are designed and selected. Combined with the vehicle driving equation, the whole vehicle model is established, and the low-speed running state of the electric vehicle is simulated. The simulation results show that the simulation system can meet the requirements of the electric vehicle running well.
【學(xué)位授予單位】:河北科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM33;U469.72
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