Patent ID: 8653765
Filing Date: 2014-02-18
Classification: H02P

Abstract:
1. A method of controlling rotation of a motorized spindle, comprising the steps of: a) sensing, by a sensing unit, vibration of the spindle; b) generating, by the sensing unit, a voltage signal corresponding to the vibration of the spindle; c) determining, by a processing unit, whether the voltage signal generated in step b) is greater than a reference voltage corresponding to a predetermined vibration level of the spindle and is less than a predetermined threshold voltage that is greater than the reference voltage; d) generating, by the processing unit, an adjusting ratio equal to the reference voltage divided by the voltage signal upon detecting that the voltage signal generated in step b) is greater than the reference voltage and is less than the threshold voltage in step c); and e) reducing, by the processing unit, a rotation speed of the spindle by the adjusting ratio.