Electromagnetic Performance Analysis of Outer Halbach Magnet Rotor Brushless DC Motor 150kW.

In this paper, an outer rotor electric bike brushless DC motor of 200 KW for Electric Vehicles is investigated with different magnet topologies. Magnetic angle and Halfbach arrangement are varied to evaluate their electromagnetic torque, forces, and temperature distribution. The power and torque density and efficiency performance have been also studied and compared with IPM motors with the same geometry and power drives. This study for applying an autodesign program is to find out suitable permanent magnetic parameters and winding size after iterations. This program allows us to estimate the magnetic flux density, electromagnetic torque, and ripple torque via a finite element magnetic method (FEMM). To reduce the cogging torque ripple and harmonic order of Back EMF, the magnet angle and Halbach topology will be validated by the FEM simulation. The simulated results are also compared with the measured results from the experimental test system. [ABSTRACT FROM AUTHOR]