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DC motor rotation detecting apparatus and DC motor rotation control apparatus

  • US 6,617,816 B2
  • Filed: 12/27/2000
  • Issued: 09/09/2003
  • Est. Priority Date: 12/27/1999
  • Status: Expired due to Fees
First Claim
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1. A DC motor rotation detector apparatus configured to detect at least one of a rotational direction, a rotational speed, a rotational position, and a cumulative rotation number of a rotor of a DC motor, comprising:

  • at least one rotation detector brush configured to detect a rotation of the rotor;

    a reference voltage device configured to generate a reference voltage; and

    a comparator configured to compare a voltage detected by the rotation detector brush with the reference voltage generated by the reference voltage device to generate a pulse train of pulse period corresponding to the rotation speed of the rotor.

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