Spindle-motor control method, spindle-motor control device, spindle-motor drive circuit and disk device

摘要

This invention relates to a control method, control device, and drive circuit for controlling the rpm of a spindle motor in order to reduce the rise time of the spindle motor. There is a discharge circuit 91-2 in the charge pump 91 of a spindle-motor driver 38. A control circuit 12 detects when the rpm of the spindle motor reaches near a target rpm, and discharges the charge pump 91. In this way, the rotation error near the target rpm is discharged, so it is possible to control and suppress overshoot. This makes is possible to reduce the rise time.