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Motor control apparatus for a ventilation system

  • US 8,287,244 B2
  • Filed: 01/18/2008
  • Issued: 10/16/2012
  • Est. Priority Date: 11/28/2007
  • Status: Expired due to Fees
First Claim
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1. A motor control apparatus for a ventilation system, the apparatus comprising:

  • an electric current sensor configured to detect an electric current applied to a motor;

    a speed sensor configured to detect a rotational speed of the motor; and

    a controller configured to choose between a first feedback control and a second feedback control such that the first feedback control is chosen when the detected electric current is greater than a reference value and that the second feedback control is chosen when the detected electric current is smaller than a reference value, wherein the first feedback control comprises maintaining a product of the electric current and the rotational speed to stay within proximity of a first target value;

    wherein the second feedback control comprises maintaining the rotational speed within proximity of a second target value, and wherein the first feedback control and the second feedback control further comprise controlling the motor'"'"'s operation so as to generate a substantially constant airflow rate from a fan coupled with the motor.

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