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Disk drive apparatus and motor

  • US 6,586,902 B2
  • Filed: 07/25/2001
  • Issued: 07/01/2003
  • Est. Priority Date: 07/26/2000
  • Status: Expired due to Fees
First Claim
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1. A disk drive apparatus comprising:

  • head means for at least reproducing a signal from a disk or recording a signal on a disk;

    processing means for at least processing an output signal from said head means and outputting a reproduced signal or processing a signal and outputting a recording signal into said head means;

    a rotor, having a field part which generates field fluxes, for driving said disk;

    Q-phase windings (Q is an integer of 3 or more);

    voltage supply means, including two output terminals, for supplying a DC voltage;

    power supply means having Q first power transistors and Q second power transistors, each of said Q first power transistors forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second power transistors forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

    voltage detecting means for producing a detected pulse signal responding with terminal voltages of said Q-phase windings, for producing a speed pulse signal which corresponds to a rotational speed of said disk and for producing a detection informing signal at an edge of the detected pulse signal;

    activation operation means for controlling active periods of said Q first power transistors and said Q second power transistors responding with said detected pulse signal of said voltage detecting means, each of said active periods being an electrical angle which is larger than 360/Q degrees;

    commanding means for producing a command signal responding with said speed pulse signal; and

    switching operation means for producing a switching pulse signal corresponding to said command signal, causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said disk is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal from said voltage detecting means.

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