Novel Control Method for Higher Output Power of Synchronous Reluctance Motors Not Used Rare-earth Metal

近年来，效率高的永磁同步电机得到了广泛的应用。永磁同步电机需要稀土金属。因此，本研究提出采用无稀土磁体的同步磁阻电机来代替永磁同步电机。同步磁阻电机的功率比永磁同步电机的功率小。研究的目的是实现同步磁阻电机的无位置传感器控制。无位置传感器控制有望带来更高的输出功率，本文提出了一种基于高频电流的同步磁阻电机在极低转速和负载条件下的无位置传感器控制方法。实验结果表明，在很低的转速和负载条件下，可以在没有位置传感器的情况下控制同步磁阻电机。

Recently, the permanent magnet synchronous motors(PMSMs) which are high efficiency have been widely used. The PMSMs needs the rare-earth metal. However, it has become difficult to take possession of the rare earth.Therefore, this study proposes to apply the synchronous reluctance motors which have no the rare earth magnets instead of the PMSMs. The power of the synchronous reluctance motors is less than one of the PMSMs. The purpose of study is the realization of the position sensorless control of the synchronous reluctance motors. The position sensorless control is expected to bring higher output power.In this study, a novel position sensorless control method of the synchronous reluctance motors using the high frequency currents is proposed under very low speeds and loaded conditions. The experimental results show that it is possible to control the synchronous reluctance motors without the position sensors under very low speeds and loaded conditions.