DRIVING SYSTEM, APPARATUS AND METHOD FOR SPINDLE MOTOR

摘要

A driving method for a spindle motor and associated driving system and apparatus are provided. The driving method includes the following steps. Plural modulation signals and plural floating phases corresponding to the plural modulation signals are adjusted. A floating period comes immediately after an active period of each of the plural modulation signals according to the plural floating phases. During the floating period, a demagnetization time of the spindle motor is acquired according to a first terminal voltage signal at a first terminal of the spindle motor. If the demagnetization time is not smaller than the threshold time period, the step of adjusting the plural modulation signals is repeatedly done. Whereas, if the demagnetization time is smaller than the threshold time period, after the demagnetization time, a phase of the spindle motor is obtained according to the first terminal voltage signal.

主权项

1. A spindle motor driving apparatus coupled to a first terminal, a second terminal and a third terminal of a spindle motor, comprising:
a motor controller for generating plural modulation signals and plural floating phases corresponding to the plural modulation signals, wherein a floating period comes immediately after an active period of each of the plural modulation signals, wherein a first modulation signal of the plural modulation signals corresponds to a first floating phase of the plural floating phases; a driving circuit receiving the plural modulation signals, and generating a first terminal voltage signal to the first terminal, a second terminal voltage signal to the second terminal and a third terminal voltage signal to the third terminal; and a demagnetization measuring circuit connected to the first terminal, wherein at the first floating phase, the demagnetization measuring circuit measures a change of the first terminal voltage signal so as to calculate a demagnetization time of the spindle motor.