Inductive speed or torque sensor with compensation for external

Details Inductive speed or torque sensor with compensation for external Inductive speed or torque sensor with compensation for external

1993-03-17

1994-12-13

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

73519, 32420712, 324225, 324164, G01P 349, G01P 3488

Patent

active

053732340

ABSTRACT:
A speed or torque probe comprises a permanent magnet havings its north-south axis extending radially of a bladed rotor, so that the tips of the blades pass in close proximity to one pole of the magnet, and a T-shaped pole piece. A first portion of the pole piece, corresponding to the upright portion of its T-shape, extends tangentially of the rotor, with its free end in contact with the other pole of the magnet, while the other portion of the pole piece, corresponding to the cross-piece of its T-shape, again extends radially of the rotor. As a result, the magnet, the first portion of the pole piece and the half of the other portion nearer to the rotor form a variable magnetic circuit, such that the passing rotor blades induce eddy currents in a first coil wound upon the half of the other portion of the pole piece nearer to the rotor. A second coil is wound on the half of the other portion of the pole piece further from the rotor, and connected in opposition to the first coil, so that voltages induced by stray external magnetic fields in the first coil tend to be cancelled by those induced by these same fields in the second coil.

REFERENCES:
patent: 3617874 (1971-11-01), Forster
patent: 3932813 (1976-01-01), Gallant
patent: 3984713 (1976-10-01), Presley
patent: 4841243 (1989-06-01), Bishop et al.
patent: 4901015 (1990-02-01), Pospischil et al.
patent: 5117181 (1992-05-01), Clergeot et al.
Ramirez, C. N.; Reluctance Sensor, IBM Technical Disclosure Bulletin, vol. 22 No. 9 Feb. 1980, pp. 3907, 3908.

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