Brushless DC motor ringing noise: A case study
Keywords:
Acoustic noise, Magnets, Rotors (windings), Viscoelasticity, Brushless direct current motorsAbstract
The rotor's mode in a brushless DC motor at around 1600 Hz resonates at certain a speed due to various electromagnetic forces. The addition of a viscoelastic material between part of the magnets and the rotor increases the mode's damping and reduces the ringing noise by more than 10 db(A). This provides an efficient way of reducing the noise without making changes to the motor.Published
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