A study on BLDC motor for blower system considering vibration

A brushless DC (BLDC) motor for air management system of fuel cell modules is presented. Using magnetic equivalent circuit model a basic design of the motor is determined, and specific configurations are inspected thanks to finite element analysis. In order to reduce an unbalanced magnetic force in an axial direction, induced forces between a stator core and a permanent magnet are calculated with respect to the relative positions of them. Also vibration mode and eccentricity of a rotor are considered at the rated and maximum rotational speed. Finally, air blower system combined with the motor and an impeller is manufactured and output properties, such as an air pressure and an amount of flowing air, are measured. Through the experimental results, a validity of the simulated one is confirmed.