Analysis of vibration and music scale of brushless DC motor with surface permanent magnets, 40th International Congress and Exposition on Noise Control Engineering, Osaka, 2011.9.5
Abstract: The authors have proposed a method to convert the meaningless acoustic noise into a comfortable melody by introducing a d-axis current with sound frequency into a brushless DC motor with surface permanent magnets. This paper theoretically verifies the proposed method by analyzing the vibration and music scale emitted from the motor. The analysis method for the vibration, which is the cause of an acoustic noise and/or melody, is presented. The calculated results are in good agreement with the measured ones. Moreover, the vibration characteristics are clarified by changing the sound frequency, the motor speed and the output power. A desired melody can be generated by sequentially emitting the musical scales.