Study on Outer Rotor Type Multipolar SR Motor and its Application to Electric Vehicle

开关磁阻电机（SR电机）具有高可靠性，高效率和低成本的特点，因为SR电机结构简单，坚固，没有永磁体和转子绕组。遗憾的是，SR电机由于其转矩脉动大，噪声大，尚未广泛投入实际应用。然而，最近的电机技术，包括基于FEM的优化设计和基于DSP或FPGA的瞬时电流控制，逐渐克服了SR电机的缺陷。在SR电机的实际应用中，已经出现了燃油泵、洗衣机、吸尘器等产品。在本研究中，我们提出了一种外转子式多极SR电机作为新的尝试，并用两年的时间为小型电动汽车开发了多极SR电机。所得结果如下：20041年所得结果。SR电机动态分析方法的建立电动汽车外转子式多极SR电机的设计。电动汽车外转子式多极SR电机的制造。外转子式多极SR电机驱动电路及控制器的研制。结果在20051年获得。用研制的多极SR电机、驱动电路和控制器制造电动汽车。对驱动电路和控制器进行改进，使其运行可靠。experiments.4开车。为提高电动汽车的性能，提出了新的SR电机控制方法。SR电机优化设计方法的建立。综上所述，我们开发了一种新型的外转子式多极SR电机，并利用所开发的SR电机实现了电动汽车的直接驱动。电动汽车的性能很好。这样就完成了本研究的最初目标。

Switched reluctance motor (SR motor) exhibits desirable features including high reliability, good efficiency and low cost because the SR motor has simple and solid structure without permanent magnets and rotor windings. Unfortunately, the SR motor has not been put into practical applications widely because of its large torque ripple and acoustic noise. However, recent motor technology, which includes an optimum design based on FEM and instantaneous current control using DSP or FPGA, overcomes gradually the defects of the SR motor. Some products such as fuel pump, washing machine and vacuum cleaner have been already presented in the practical applications of SR motor.In this research, we proposed an outer rotor type multi-polar SR motor as a new attempt, and developed a multi-polar SR motor to an small electric vehicle for two years. The obtained results are as follows :The results obtained in the year 20041. Establishment of dynamic analysis method for SR motor.2. Design of the outer rotor type multi-polar SR motor for electric vehicle.3. Manufacturing of the outer rotor type multi-polar SR motor for electric vehicle.4. Manufacturing of the driving circuit and controller for the outer rotor type multi-polar SR motor.The results obtained in the year 20051. Manufacturing the electric vehicle with the developed multi-polar SR motor, the driving circuit and controller.2. Improvement of the driving circuit and controller for the purpose of reliable operation.3. Driving experiments.4. Proposal of new control methods of the SR motor for improvement of the performance of the electric vehicle.5. Establishment of the optimum design method of the SR motor.To conclude, we developed a new outer rotor type multi-polar SR motor and realized a direct driving electric vehicle using the developed SR motor in this research. The electric vehicle has good performance. Then the original target of this research has been accomplished.