The Study Of In-wheel Switched Reluctance Motor And Driving System Based On Use Of Electric Vehicle

In-wheel Motor Driven EV is not only an important driver in the form of electric vehicles, but also an important direction of future EV development, Wheel drive is an important driver in the form of electric vehicles, but also an important future direction of development of new energy vehicles; Due to the advantages of the In-wheel Switched Reluctance Motor in structure and performance, its application in the field of electric vehicles is full of expectations, According to the design requirements for In-wheel EV, this paper has studied the SR wheel motor drive system, including the following:Part I reviews the development of Electric Vehicles all over the world, including the development of the current status of drive motor, drive structure, vibration and noise suppression, etc., by analyzing the structure of the drive motor and structure, clear the practical significance of the SRM drive system based on the two-wheeled.Part II analyzes the basic structure and working principle of SRM; through the analysis of linear models, views operation rules of the SRM, and lays the foundation for the structural design of the outer rotor SRM.Part III has designed the outer rotor SRM and position detection with the EV applications, and finite element simulation has validated the performance of the motor and produced the prototype in accordance with the size of design; Base on the application environmental and performance requirements for the EV, this paper has studied the SRM control strategy, and explored the noise and torque ripple suppression, simulation results show that the two-step commutation and the optimization of switch angles can reduce torque ripple.Part IV has designed the hardware and software components of In-wheel drive system based on requirements for EV applications. Control core of controller uses TI’s DSP2812, the chip has two event manager can implement dual independent motor control, Periphery integrates current collection, current protection, driver circuit, steering wheel detection systems and other functional modules; software part analyze the implementation process of the functional modules by flow chart; software persist for programming ideas, complex control systems is divided into different functional control modules, such as:the current AD sampling module, the speed calculation module, PWM module, APC control module, key detection module, fault display module, acceleration and deceleration control module, each functional module is written by a unified model and establish an independent function, this program has a better way to read and provide the condition to extended.Part V tests the overall performance of the prototype, the main aspects include the motor position signal, power components, noise suppression, load characteristics and has achieved the expected results; through the analysis of experimental data, has obtained variation rules of turn-on angle, turn-off angle, current and torque, and provides the conditions for speed and torque control of SRM.