Examination of stator magnets applied to Magnetization Reversal Motor

Research into higher motor efficiency is a constant trend in motor research, as it contributes significantly to reducing electricity consumption, and it is constantly being carried out. The reduction of losses is necessary to improve the efficiency of motors, and studies are mainly concerned with the reduction of copper losses. Conventional copper loss reduction methods are based on reducing resistivity, such as improving the conductor’s fill factor. However, this method has not contributed to a significant reduction in copper loss. In recent years, research has also been conducted on methods to reduce copper loss by using variable magnetic force magnets. A new motor, the magnetization reversal motor (MRM), which rotates using magnetization reversal of the magnet, has been proposed. The magnetization reversal motor is driven by the attraction and repulsion of the magnetic forces between the rotor and stator magnets. The effective value of the current during the drive can be reduced, which can drastically reduce copper losses. However, controlling the magnetization state of the stator magnets is essential to drive MRM. Therefore, this paper examines the variable magnetization magnets applied to MRM through analysis and experiments. The basic characteristics of the MRM is also investigated and described using analysis.