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Motor drive device and drive method

  • US 7,402,975 B2
  • Filed: 10/11/2006
  • Issued: 07/22/2008
  • Est. Priority Date: 10/11/2005
  • Status: Expired due to Fees
First Claim
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1. A motor drive device operable to supply drive power to a motor to drive the motor, comprising:

  • a drive signal generator operable to generate a drive signal;

    a driver operable to produce the drive power based on the drive signal;

    a torque control signal generator operable to generate a torque control signal specifying the motor torque;

    a speed detector operable to detect the rotational speed of the motor and to generate a rotational speed signal denoting motor speed information; and

    a speed difference detector operable to generate a first speed difference detection signal if the rotational speed signal is greater than the torque control signal and a second speed difference detection signal if the rotational speed signal is less than the torque control signal;

    wherein said drive signal generator is controlled based on the first and second speed difference detection signals.

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