×

Increased digital spindle motor control resolution through dither

  • US 7,012,396 B1
  • Filed: 09/30/2004
  • Issued: 03/14/2006
  • Est. Priority Date: 09/30/2004
  • Status: Active Grant
First Claim
Patent Images

1. A motor controller for providing pulse width modulated drive signals to a motor, the motor controller comprising:

  • an input for receiving a digital demand code for controlling motor speed;

    a dither generator for generating a digital dither value;

    an adder for generating a dithered demand code equal to a sum of the dither value and the demand code;

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

    a pulse width modulation controller for generating pulse width modulated drive signals having duty cycles controlled as a function of a stored set of waveform coefficients, the dithered demand code, and the rotational position of the motor.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×