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FINE RESOLUTION MOTOR CONTROL

  • US 20100102765A1
  • Filed: 10/29/2008
  • Published: 04/29/2010
  • Est. Priority Date: 10/29/2008
  • Status: Active Grant
First Claim
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1. A method of generating a motor control signal for a motor having a rotor that rotates at a rotational rate, the method comprising the steps of:

  • generating first, second, and third sinusoidal signals, each sinusoidal signal being 120-degrees out of phase with the other sinusoidal signals;

    differentiating the first, second, and third sinusoidal signals to obtain first, second, and third cosine signals, respectively;

    subtracting the first sinusoidal signal from the third sinusoidal signal to obtain a first sinusoidal difference signal;

    subtracting the second sinusoidal signal from the first sinusoidal signal to obtain a second sinusoidal difference signal;

    subtracting the third sinusoidal signal from the second sinusoidal signal to obtain a third sinusoidal difference signal;

    multiplying the first sinusoidal difference signal and the second cosine signal to obtain a first product signal;

    multiplying the second sinusoidal difference signal and the third cosine signal to obtain a second product signal;

    multiplying the third sinusoidal difference signal and the first cosine signal to obtain a third product signal;

    summing the first, second, and third product signals to obtain a summation signal; and

    multiplying the summation signal by a constant to obtain a rate signal that is proportional to the rotational rate of the rotor.

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