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Title: Noise-cancelling quadrature magnetic position, speed and direction sensor

An array of three magnetic sensors in a single package is employed with a single bias magnet for sensing shaft position, speed and direction of a motor in a high magnetic noise environment. Two of the three magnetic sensors are situated in an anti-phase relationship (i.e., out-of-phase) with respect to the relationship between the other of the two sensors and magnetically salient target, and the third magnetic sensor is situated between the anti-phase sensors. The result is quadrature sensing with noise immunity for accurate relative position, speed and direction measurements.
 [1];  [2]
  1. (Niskayuna, NY)
  2. (Schenectady, NY)
Issue Date:
OSTI Identifier:
General Electric Company (Schenectady, NY) OSTI
Patent Number(s):
US 5489844
Contract Number:
Research Org:
Country of Publication:
United States
noise-cancelling; quadrature; magnetic; position; speed; direction; sensor; array; sensors; single; package; employed; bias; magnet; sensing; shaft; motor; noise; environment; situated; anti-phase; relationship; 180; degree; out-of-phase; respect; magnetically; salient; target; third; result; immunity; accurate; relative; measurements; relative position; phase relationship; magnetic noise; magnetic sensors; shaft position; direction sensor; magnetic sensor; /324/

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