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Method and system for motor velocity measurement

  • US 6,791,217 B2
  • Filed: 04/04/2002
  • Issued: 09/14/2004
  • Est. Priority Date: 09/16/1999
  • Status: Expired due to Term
First Claim
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1. A system for determining a velocity of a rotating device, comprising:

  • an apparatus having a rotational part including a set of sense magnets affixed to a rotating shaft of said rotating device configured to rotate about a rotation axis;

    a circuit assembly, including a circuit interconnection having a plurality of sense coils, a sensor affixed to said circuit assembly, said circuit assembly adapted to be in proximity to said set of sense magnets;

    wherein said set of sense magnets combines with said circuit assembly to form an air core electric machine such that voltages generated from each sense coil of said plurality of sense coils exhibits an amplitude proportional to said velocity;

    a controller coupled to said circuit assembly, said controller adapted to execute an adaptive algorithm including;

    receiving a position signal related to rotational position transmitted to said controller;

    determining a derived velocity signal utilizing said position signal;

    receiving a plurality of tachometer velocity signals;

    determining a compensated velocity signal in response to said plurality of measured tachometer velocity signals;

    blending said plurality of compensated velocity signals with said derived velocity signal under selective conditions to generate a blended velocity output indicative of said velocity of said rotating device.

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