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Programmable pulse width modulated waveform generator for a spindle motor controller

  • US 6,515,443 B2
  • Filed: 05/21/2001
  • Issued: 02/04/2003
  • Est. Priority Date: 05/21/2001
  • Status: Expired due to Term
First Claim
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1. A motor controller for an electric motor which provides pulse width modulated drive signals to the electric motor, the motor controller including:

  • a control circuit for providing a magnitude control signal for controlling motor speed;

    an input for receiving a modifier signal representing a selected waveform shape;

    a position determining circuit for determining rotational position of the motor; and

    a pulse width modulation (PWM) controller for controlling duty cycles of the pulse width modulated drive signals as a function of a stored set of main waveform coefficients, a stored set of modifier coefficients, the rotational position of the motor, the magnitude control signal, and the modifier signal.

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