Patent ID: 6204621
Filing Date: 2001-03-20
Classification: G11B,H02P,Y10S

Abstract:
A disk drive apparatus comprising:a disk at least recorded with an information signal or to be recorded with an information signal;a head for at least reproducing a signal from said disk or recording a signal on said disk;processing means for at least processing an output signal from said head and outputting a reproduced information signal, or processing a signal and outputting a recording signal into said head;a movable member, having a field part which generates field fluxes, for directly driving said disk; plural-phase windings;voltage supplying means, including two output terminals, for supplying a DC voltage;Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;Q pieces of second power amplifying means each including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said plural-phase windings;altering signal producing means for producing altering signals;first distribution control means for controlling operations of said Q pieces of first power amplifying means;second distribution control means for controlling operations of said Q pieces of second power amplifying means;commanding means for outputting a command signal corresponding to a rotational speed of said disk; andswitching operation means for causing at least one power transistor of Q pieces of said first power transistors and Q pieces of said second power transistors to perform high-frequency switching corresponding to an output signal from said commanding means, supplying a pulsive conducted current signal to said plural-phase windings from said voltage supplying means, and changing the peak value of said pulsive conducted current signal responding with or corresponding to at least an output signal of said altering signal producing means.