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Method and apparatus for driving a DC motor

  • US 7,592,764 B2
  • Filed: 01/02/2008
  • Issued: 09/22/2009
  • Est. Priority Date: 01/02/2007
  • Status: Active Grant
First Claim
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1. A control circuit for an electric motor, the electric motor comprising a rotor, a stator and windings, the control circuit having a feedback loop regulator to generate a control signal (TL or TR) to control a current drive circuit to control the amplitude of current (iw) in the windings, the feedback loop regulator being arranged to compare the amplitude of the current (iw) in the windings with a reference value (iset), the control circuit also having circuitry to extract a characteristic (DC) of the control signal, said characteristic varying in function of time as the back electromotive force in the windings,the control circuitry further having circuitry to determine cinematic quantities and/or to determine the direction of rotation of the motor.

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