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

近年来，高效率的永磁同步电动机得到了广泛的应用。永磁同步电机需要稀土金属。然而，稀土的占有已变得困难，因此，本研究提出应用不含稀土磁铁的同步磁阻电动机来取代永磁同步电动机。同步磁阻电动机的功率小于其中一个PMSM。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，在这项研究中，一种新的位置传感器控制方法的同步磁阻电机使用高频电流在很低的速度和负载条件下提出。实验结果表明，在极低的转速和负载条件下，无位置传感器的同步磁阻电机控制是可能的。

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.