Design of Flux Barrier for Reducing Torque ripple and Cogging Torque in IPM type BLDC motor

Abstract

This paper proposes a novel designing method of flux barrier in order to reduce cogging torque and torque ripple in the interior permanent magnet type brushless DC motor (IPM type BLDC motor). IPM type BLDC motor is used for high speed and high torque. But IPM type BLDC motor can develop a large cogging torque that may cause noise and vibration. In that sense, this paper suggested that the directions of flux lines generated in the permanent magnet built in the rotor should be sinusoidal waveform distributed within the rotor by such designed flux barriers