Disk drive control system and method for determining the temperature of an actuator coil

摘要

A hard disk drive comprising an actuator control system that measures the temperature of an actuator coil and methods for providing the same. The control system comprises a controller and a current source controlled by the controller that generates a flow of current through the actuator so as to reposition a transducer of the drive. The control system further comprises sampling means for sampling at least one electrical characteristic of a conducting path defined by the coil. The control system measures the temperature by monitoring the current flowing through the coil and/or the voltage across the coil and by extracting the coil temperature from the monitored values. In one embodiment, the control system obtains a measurement of the coil by successively approximating the resistance of the coil until an estimated back emf component of the voltage across the coil.