Characteristics comparison of BLDC motor according to the lead angles

This paper presents a result of the electrical characteristics analysis as well as the mechanical noise and vibration of the Brushless DC motor (BLDC motor) according to the lead angles. To do that, the characteristics of the 3-phase BLDC motor using six step square waves, such as the input current, torque, torque ripple and the torque ratio per input current, are compared by finite element analysis (FEA) and dynamic simulation. Additionally, In order to evaluate the effect of the radial force on the vibration, then the equivalent magnetizing current method is used to calculate the local force which then is employed in the mechanical FEA. Based on the results in this paper, the lead angle adjustment method for BLDC motor is going to be the rule for the determination of the lead angle. The validity of the analysis result is verified by comparing the analyzed results with measured ones.