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Motor driving device and motor driving method

  • US 6,940,239 B2
  • Filed: 12/03/2002
  • Issued: 09/06/2005
  • Est. Priority Date: 12/04/2001
  • Status: Expired due to Term
First Claim
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1. A motor driving device for driving a motor by energizing motor coils with PWM control, the motor driving device comprising:

  • an energization switching section for determining a first energized phase and a second energized phase to be PWM-controlled, the determination being made at a predetermined cycle;

    a torque command signal generation section that receives an original torque command signal for producing a first torque command signal and a second torque command signal each having an amplitude according to the original torque command signal;

    a comparison section that receives the first and second torque command signals and a current detection signal, which is obtained by detecting a current being supplied to the motor, for comparing the current detection signal with the first and second torque command signals to output a first comparison result and a second comparison result, respectively;

    an oscillation section for producing a first set pulse signal and a second set pulse signal; and

    a PWM control section that receives the first and second set pulse signals and the first and second comparison results for producing a first PWM control signal according to the first set pulse signal and the first comparison result and producing a second PWM control signal according to the second set pulse signal and the second comparison result, wherein the first and second energized phases, which are determined by the energization switching section, are energized with PWM control in parallel according respectively to the first and second PWM control signals, which are produced by the PWM control section.

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