초록 ▼

A disk drive apparatus reproduces an information signal from a disk with a head, and outputs a processed information signal from the reproduced signal of the head. A movable member having a field part which generates field fluxes is coupled to the disk so as to rotate the disk directly. First FET po

A disk drive apparatus reproduces an information signal from a disk with a head, and outputs a processed information signal from the reproduced signal of the head. A movable member having a field part which generates field fluxes is coupled to the disk so as to rotate the disk directly. First FET power transistors of first power amplifying parts and second FET power transistors of second power amplifying parts form current paths from a DC power source to three-phase windings. Three-phase first amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the first power amplifying parts. Three-phase second amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the second power amplifying parts. A switching operation block performs simultaneous on-off switching of the conduction control terminal sides of the first power amplifying parts, thereby causing first FET power transistors of the first power amplifying parts to perform high-frequency on-off switching. The switching operation block changes a peak of a pulsive conducted current signal from a DC voltage source to the three-phase windings responding with or corresponding to a rotation of the disk. As a result, three-phase drive currents to the windings vary smoothly, and the disk drive apparatus reduces a vibration and an acoustic noise of the disk. Further, the disk drive apparatus reduces a power consumption and a heat to the disk.

대표청구항 ▼

[What is claimed is:] [1.]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 outputtin

[What is claimed is:] [1.]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.