Electric motors are widely used in information device, home electric, industry, etc. The technical demands on motor nowadays should meet not only compact, high power and efficiency but also less noise and vibration. In this study, a simple plate and an electromagnet are used to measure the magnetic flux density and the plate vibration. Also the electromagnetic analysis model is used to calculate the electromagnetic excitation force that loads on FE plate model to predict the vibration for verification. Then an axial gap type brushless DC motor is dealt with for actual application. The predicted magnetic flux density based on electromagnetic analysis model of the motor is confirmed by measured data. Finally structural modification to change the FRF of rotor component is applied and the noise improvement is achieved under operating condition.
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