| Abstract |
An electronic technique, originally developed for the cancellation of stator vibration in the switched
reluctance motor, has been applied to reduce acoustic noise generated by part of a fan/blower system
which is remote from the motor. When a single phase switched reluctance motor was coupled to a
hand dryer it was found that the excitation of the motor induced acoustic noise from the fan housing
at the natural resonant frequency of the housing. The electronic cancellation technique was then
applied to the motor commutation control producing two opposing vibrations in the fan housing
which had a cancelling effect, inhibiting the excitation of the resonance. This resulted in a 10dB
reduction in the magnitude of vibration of the housing at its mechanical resonant frequency, and
significantly reduced the audible acoustic noise generated by the resonance as perceived by the user. |
