Design and Reduction in Cogging Torque in Radial Flux PMBLDC Motor

Abstract

Permanent magnet motor offers distinct advantages over conventional electrical motors like high efficiency, compactness, better dynamic response and high speed range. It is always desirable to enhance performance of Permanent Magnet motor. According to direction of flux permanent magnet brushless D.C. motor are classified in two categories 1) radial flux permanent magnet BLDC motor 2) axial flux permanent magnet BLDC motor. Design of radial flux PMBLDC motor is intensive process as many deign variable and constraints are involved. This project is focused on to design and analysis of radial flux PMBLDC motor. Radial flux permanent magnet brushless D.C Motor suffers from high cogging torque. It is very essential to reduce cogging torque to reduce vibration and noise. Standard ratings radial flux permanent magnet brushless DC motors are analyzed by implementing different techniques to reduce cogging torque in order to improve the performance of the motor. Finite Element Analysis (FEA) has been carried out to validate various techniques.