The hysteresis motor had a characteristic in which the rotor ring volume is proportional to the output power. Therefore, increasing the ring thickness can enhance output by enlarging the rotor volume. However, beyond a certain thickness, the output no longer increases proportionally and even decreases due to rotational hysteresis effects. Previous designs based on equivalent circuits could not fully consider this phenomenon. In this study, finite element analysis capable of reflecting rotational hysteresis was used to verify this effect analytically. By varying the axial length and ring thickness under the same rotor volume, the range of thicknesses causing output reduction was identified. Furthermore, this behavior was analyzed more reliably through calculations of the phase difference between magnetization and magnetic field. The findings are expected to contribute to improving the output performance of small hysteresis motors.
Park et al. (Fri,) studied this question.