Optimum design of magnet shape in permanent-magnet synchronous motors

Abstract

In order to improve the efficiency of the permanent-magnet synchronous motor, which is closely related to its magnet shape, we have designed magnets in various shapes. A parallel top sine wave design has proved to be an optimum plan. This design adds three time components of induced phase voltage, which enables the amplitude of induced line voltage to increase about 14.9%. The design's simplified approximate arc configuration has important engineering applications.