Three-element angular position sensor

Details Three-element angular position sensor Three-element angular position sensor

1998-09-28

2000-08-08

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

32420725, G01B 730, G01R 3309

Patent

active

061006823

ABSTRACT:
A device for sensing angular positions of a rotating ferromagnetic target wheel which has teeth and slots along its periphery. A magnetic sensor is positioned adjacent the target wheel. The sensor has a biasing magnet and three sensing elements mounted on the biasing magnet. The sensing elements are sequentially positioned and equally spaced such that their output signals are equally phase shifted by an angle corresponding to their positions. Each sensing element is responsive to the passage of each tooth adjacent the sensing element. The leading and trailing edges of each tooth represent an angular position of the target wheel. Transition points between the leading and trailing edges are determined by obtaining differential signals between the first sensing element and the second sensing element and between the second sensing element and the third sensing element and then finding their crossover points. The crossover points are used to determine the angular positions of the target wheel.

REFERENCES:
patent: 5668471 (1997-09-01), Lequesne et al.
patent: 5731702 (1998-03-01), Schroeder et al.

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