Suppression of Spatial-harmonic with Magnetic Composite Ring on Interior Winding Synchronous Motor

Abstract

　The fluctuation of the magnetic resistance on the concentrated winding motor is large at high speed rotation. Spatial harmonics are easily generated, which leads to an increase in torque ripple and iron loss. Therefore, we propose a motor structure that reduces spatial harmonics by providing a ring formed of a magnetic composite material on the stator. The ring of magnetic composite can reduce magnet iron loss and torque ripple by more than 50% and 2%, respectively, com-pared to conventional motors.