Patent ID: 6094020
Filing Date: 2000-07-25
Classification: G11B,H02P

Abstract:
A disk drive connectable to a power supply having a fixed DC voltage, the disk drive comprising:a voice coil motor (VCM) having a coil;a spindle motor having a plurality of windings and a rotor rotatable at a variable spin-rate, the rotor having permanent magnets;a fixed DC voltage power conductor for receiving and conducting the fixed DC voltage;a spindle motor driver coupled to the fixed DC voltage power conductor and at least one of the windings;a spindle motor controller for commanding the spindle motor driver to selectively apply the fixed DC voltage to the at least one of the windings to control the spin-rate of the rotor;the permanent magnets inducing an AC voltage across the windings while the rotor is rotating;a rectifier circuit coupled to at least one of the windings for rectifying the AC voltage across the at least one winding to produce a rectified DC voltage;a first node;first means coupled between the rectifier circuit and the first node for selectively providing the rectified DC voltage to the first node;second means coupled between the fixed DC voltage power conductor and the first node for selectively providing the fixed DC voltage to the first node;the first node having a first node DC voltage that is determined by the rectified DC voltage provided by the first means and the fixed DC voltage provided by the second means, the first node DC voltage being greater than the fixed DC voltage during a track seeking operation in the disk drive while the fixed DC voltage is being provided from the power supply; anda VCM driver having switching elements coupled to the first node and the VCM for selectively providing the first node DC voltage across the coil of the VCM.