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Disk drive apparatus and motor

  • US 6,566,827 B2
  • Filed: 11/08/2001
  • Issued: 05/20/2003
  • Est. Priority Date: 11/09/2000
  • Status: Expired due to Fees
First Claim
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1. A disk drive apparatus comprising:

  • head means for reproducing a signal from a disk;

    processing means for processing an output signal from said head means and outputting a processed signal;

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

    power supplying 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;

    position detecting means for producing a position signal which responds with the rotation of said rotor;

    activation operation means for controlling active periods of said Q first power transistors and said Q second power transistors responding with an output signal of said position detecting means, each of said active periods being larger than the period of 360/Q electrical degrees;

    commanding means for producing a command signal which responds with a rotational speed of said disk; and

    switching operation means for causing at least one of said Q first power transistors and said Q second power transistors to perform high-frequency switching responding with said command signal; and

    that said switching operation means includes;

    current detecting means for producing a current detection signal which responds with or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and switching control means for producing a switching pulse signal which responds with said current detection signal and said command signal, and said activation operation means produces at least a slew-rate switching signal which responds with said switching pulse signal at a control terminal side of at least one power transistor among said Q first power transistors and said Q second power transistors, said at least a slew-rate switching signal having a smoothed voltage slope in at least one of rising and falling slopes, and causes said at least one power transistor to follow said at least a slew-rate switching signal, thereby supplying a high-frequency switching drive voltage signal to one terminal of said Q-phase windings, said high-frequency switching drive voltage signal having smoothed voltage slopes and responding with said current detection signal and said command signal.

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