The Design of the Outer-Rotor Brushless DC Motor and an Investigation of Motor Axial-Length-to-Pole-Pitch Ratio

In this study, the effects of ratio a motor’s axial length to its pole pitch on efficiency, magnetic flux density distribution, torque, torque/weight, and motor volume were investigated in an outer-rotor (hub) brushless direct current motor. The weight electrical machine affects output power, efficiency it is advantageous design electric at appropriate power high with volume. Therefore, aim study was optimize stator outer diameter, which Initially, axial-length-to-pole-pitch hub BLDC taken 0.75. According ratio, dimensions rotor inner slot height, length, magnet thickness optimally determined. Then, considered as 1, 1.50, 2, 3, respectively. change speed, torque/volume, cogging torque examined simulation environment. value final state 28.65% higher than initial state. last part, diameter defined variables genetic algorithm procedure optimized. number poles slots fixed parameters. Simulation studies carried out using finite element method via AN-SYS/Maxwell software.