Patent ID: 6731450
Filing Date: 2004-05-04
Classification: G11B

Abstract:
In a disk drive comprising an actuator arm, an actuator coil adapted to move the actuator arm based on a current, and a control system for controlling a flow of the current through the actuator coil, a method of measuring the temperature of the actuator coil comprising:holding the actuator arm in a stationary state; developing a first signal indicative of a resistive component of the voltage across the actuator coil while the actuator arm is in the stationary state to reduce the effects of coil back emf in the developed first signal; developing a second signal indicative of the current flowing through the actuator coil while the actuator arm is in the stationary state to reduce the effects of coil back emf in the developed second signal; and extracting the temperature of the actuator coil from the first and second signals.