Design and Dynamic Study of a 6 kW External Rotor Permanent Magnet Brushless DC Motor for Electric Drivetrains

This paper studies electromagnetic and parametric design and performance analysis of an in-wheel out-runner BLDC (Brushless Direct Current) electric motor designed specifically for automotive applications. Typical design techniques and simulation studies are applied to the BLDC motor. Specifically, design specifications such as the number of turns, winding area, and stator pole height composing the stator structure are obtained and the performance characteristics of the motor are investigated using the finite element method (FEM). Also, the outputs in terms of phase inductances, flux linkages of each stator winding and static torques for different rotor positions are calculated and evaluated. Finally, a dynamical performance analysis is carried out by using a physical electromechanical model the BLDC motor.