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

开关磁阻电机结构简单、坚固，不需要永磁体和转子绕组，因此具有可靠性高、效率高、成本低等特点。遗憾的是，由于开关磁阻电机存在较大的转矩脉动和噪声，还没有得到广泛的实际应用。然而，最近的电机技术逐渐克服了开关磁阻电机的缺陷，包括基于有限元的优化设计和利用DSP或FPGA的瞬时电流控制。在SR电机的实际应用中，已经出现了燃油泵、洗衣机和吸尘器等产品，本研究提出了一种外转子多极SR电机作为一种新的尝试，并在两年的时间里开发了一款小型电动汽车用的多极SR电机。取得的成果如下：20041年度取得的成果。建立了SR电机的动态分析方法。电动汽车用外转子多极开关磁阻电机的设计。电动汽车用外转子多极开关磁阻电机的制造。外旋子式多极开关磁阻电机驱动电路及控制器的研制。20051年度取得的成果。用研制的多极SR电机、驱动电路和控制器制造电动汽车。改进了驱动电路和控制器，使其运行可靠。驾驶实验。为提高电动汽车的性能，提出了SR电机的新控制方法。建立了SR电机的优化设计方法。综上所述，本研究开发了一种新型外旋子式多极SR电机，并利用研制的SR电机实现了电动汽车的直接驱动。这款电动汽车性能良好。从而实现了本研究的原定目标。

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.