Current limiting for a motor winding

摘要

Techniques and apparatus for limiting the current through a motor, such as a motor for rotating a rotatable element of a hard drive. The current can be limited based on a threshold. A first threshold value can be set for a first time period. A second threshold value can be set for a second time period in which the current through the motor rises. The second threshold value is lower than the first threshold value. A spike in the supply current upon accelerating the rotatable element of the motor can thereby be reduced or eliminated.

主权项

1. A method of controlling a current through a motor of a hard disk drive based on an upper limit threshold, the method comprising:
setting the upper limit threshold at a first value for a first time period in which the motor accelerates rotation of a component of the hard disk drive; setting the upper limit threshold at a second value for a second time period, wherein the current through the motor rises during the second time period, wherein the second value is lower than the first value, wherein the second time period occurs after the first time period and during operation of the hard disk drive; and limiting the current through the motor based on the upper limit threshold.