Position and speed sensors for a rotating shaft

Details Position and speed sensors for a rotating shaft Position and speed sensors for a rotating shaft

1998-12-30

2000-12-19

Oda, Christine K.

Electricity: measuring and testing

Magnetic

Displacement

3242072, 32420725, 32420721, G01B 714

Patent

active

061631477

ABSTRACT:
A fixed sensor has two sensing elements delivering sinusoidal signals .GAMMA., and is mounted in front of the magnetized face of an annular multipolar encoder. The axis (.delta..sub.C) of the sensor (5) having the centers of the two sensing elements (51 and 52) is located at a distance (R.sub.0) from the axis (.delta..sub.R) of rotation of the encoder (4), and the encoder (4) has on its magnetized face (6) 2 m magnetic transitions between poles of opposite polarities, north and south, in the form of spirals, whose tracing is obtained by successive rotations by angles .pi./m of the first transition around the center (0) of the encoder, defined in polar coordinates (.mu., .theta.) by the equations: ##EQU1##

REFERENCES:
patent: 4041371 (1977-08-01), Hini
patent: 5017776 (1991-05-01), Loewen

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