Research And Development Of Electric Vehicle In-wheel Motor Controller

Today,the problem of energy and environment is a key factor which restricts the development of human society.In this background,electric vehicles emerged.As a result of the advantages,such as high transmission efficiency,flexible control and internal space,in-wheel motor is regard as the best driving form of electric vehicles.Motor controller is an important part of the motor driving system,so designing a controller meeting in-wheel motor's characteristics is of great significance in respect of in-wheel motor electric vehicles' development.In this paper,the research on in-wheel motor passenger vehicles can be list as follows:At first,this paper adopts the vector control as the control algorithm by comparing the different control strategies of the permanent magnet synchronous motor.According to the requirement of the simulation test,the vector control method of id = 0 is selected.With the principle of SVPWM,the practical PWM project is built.Set up the simulated and analytical models of the vector control algorithm by using MATLAB / Simulink,so as to verify the rationality of the algorithm.Secondly,according to the simulation analysis,the driving structure of the motor controller can be put forward,that is,the IGBT in traditional controller are replaced by six MOSFETs in parallel.Making use of ANSYS / Simplorer software,the inverter model which simulates the MOSFET switching process is established,and the vector control algorithm in Simulink drives the inverter in Simplorer.Through simulating and analyzing the power loss of motor controller,the rationality of motor controller's structure is verified.Finally,the key technology of motor controller is discussed deeply,then a detailed as well as feasible hardware scheme is designed.According to the designscheme,the prototype of motor controller including drive module and control module is produced.Taking advantage of the test platform and control algorithm in this paper,the functions in the prototype of motor controller are tested,furthermore,the correctness of analytical method in the power loss of motor controller is verified during the simulation.