Hysteresis motor using magnetically anisotropic Fe-Cr-Co magnet

For the rotor ring of the hysteresis motor, semihard Alnico magnets have been almost applied until now. However, the hysteresis motor using Alnico magnets has several disadvantages. In order to improve the disadvantages of conventional hysteresis motors, the Fe-Cr-Co magnet steel with magnetic anisotropy is applied for hysteresis rotor ring. Magnetic anisotropy is used to cause large reluctance torque and large hysteresis torque at synchronous pull out. It is made clear from experimental results that these hysteresis motors have large output, high efficiency, and high power factor, to add the reluctance torque to hysteresis torque effectively