Magnet Reduction of V-shaped Interior Permanent Magnet Motor by Split Rotor and Non-Magnetic Wedge

This paper proposed a novel rotor structure for V-shaped interior permanent magnet motors (IPM motors) to reduce the magnet volume. Although the magnet volume, required to obtain the desired torque, could be reduced using a V-shaped magnet arrangement, its effectiveness was limited due to the leakage flux pathing through the central bridge. In the proposed motor, the central bridge was replaced by a nonmagnetic 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 that of conventional motors. To validate its effectiveness, numerical and experimental verifications were conducted. Moreover, the obtained results were compared with those of conventional motors.