Magnet Reduction Effect of Split Rotor and Non-Magnetic Wedge in V-Shaped Interior Permanent Magnet Motor

This paper proposed a novel rotor structure for V-shaped interior permanent magnet motors (IPM) to reduce magnet volume. Although the magnet volume, required to obtain desired torque, could be reduced using V-shaped magnet arrangement, its effectiveness was limited due to the leakage flux, which path central bridge. In the proposed motor, the central bridge was replaced by the non-magnetic wedge, and the leakage flux path was completely eliminated. For this reason, the magnet reduction effect of the concentrated flux structure in the V-shaped IPM could be maximized, and the magnet volume could be reduced compared with the conventional V-shaped IPM motors. To validate the effectiveness, numerical and experimental verifications were conducted. Moreover, the obtained results were compared with the conventional IPM motors.