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System and method of controlling cooling fan speeds

  • US 6,801,004 B2
  • Filed: 06/20/2002
  • Issued: 10/05/2004
  • Est. Priority Date: 06/20/2002
  • Status: Expired due to Term
First Claim
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1. A cooling fan, comprising:

  • a fan;

    a motor coupled to the fan to drive the fan;

    a speed sensor to magnetically monitor a fan speed; and

    a microcontroller, coupled to the motor and to the speed sensor, to receive the fan speed from the speed sensor, and to control a duty cycle of a stator signal based on the fan speed, wherein the stator signal provides an energy transfer to the motor.

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