STEP SKEWING ROTOR DESIGN OF PERMANENT MAGNET BLDC MOTOR FOR INWHEEL ELECTRIC VEHICLE

Abstract

Permanent magnetic brushless direct current motor (PM BLDC) can be designed with different rotor
configurations based on the arrangement of the permanent magnets. Rotor configurations strongly
influence the torque an efficiency performance of permanent magnet electrical motors. Most of the
applications prefer surface mounted permanent magnet design due to its ease of construction and
maintenance in [1]. The aim of this paper is to compare and evaluate different rotor configurations for PM
BLDC motor with or without skewed stator slot. A finite element method has been used for analysis and
comparison of different geometry parameters and configurations in [2-4]. This paper describes a
comprehensive design of a three phase PM BLDC motor 20kW for in wheel. An optimal design of PMBLDC
motor have been implemented by analytical and simulation methods.
In this paper, the skewing slot is applied to the PM surface mounted Brushless DC Motor 20kW 36
slots and 12 magnet poles (Z = 36, p = 12) for eliminating torque ripples. To observe the skewing stator
effect, the stator lamination layers are skewed with different angles. With determined skewing angle, the
cogging torque eliminated theoretically and flux density space harmonics are also reduced.