Abstract A position coder for a moving shaft generates a DC voltage having an amplitude which is proportional to the magnitude of position shift of the moving shaft of said coder with respect to a fixed point and a sign which changes whenever a shift in direction takes place. The position coder includes a disc-shaped stator with a plurality of windings equiangularly distributed along said stator and a plurality of pairs of detection coils, also angularly distributed, the first of the paired coils being at a given distance from the rotor center and the second coil of the same pair at a different distance from said center, and a rotor set up by a disc and bearing two metallic ramps, one opposite to the first windings and the other opposite to the second windings of the stator, said ramps being so arranged that the distance from ramp points to the stator varies along each ramp. The position coder may be used in servo-motors.
Inventors
👤 H Berger
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 11:21
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A proportional position coder for a servo-controlled shaft which includes a disc-shaped stator with a plurality of excitation coils equiangularly distributed on said stator and a plurality of pairs of detection coils, also equiangularly distributed, the first of the pair of detection coils being at a certain distance from rotor center and the second detection coil of the same pair being at a different distance from said center, a disc-shaped rotor bearing two metallic ramps, one opposite to the first coils and the other opposite to the second coils of the stator, said ramps being so profiled that the distance of ramp points in relation to the stator varies, along an angular extension of each ramp, means for energizing selectively an excitation coil and means for connecting in series the first detection coils between themselves and the second detection coils between themselves, so as to generate an analog position signal between these first and second detection coils.
Claim 2
Dependent Claim
157 words
A proportional position coder for a servo-controlled shaft which includes a disc-shaped stator with a plurality of excitation coils equiangularly distributed on said stator and a plurality of pairs of detection coils, also equiangularly distributed, the first of the pair of detection coils being at a certain distance from rotor center and the second detection coil of the same pair being at a different distance from said center, a disc-shaped rotor bearing two metallic ramps, one opposite to the first coils and the other opposite to the second coils of the stator, said ramps being so profiled that the distance of ramp points in relation to the stator varies, along an angular extension of each ramp, means for energizing selectively an excitation coil and means for connecting in series the first detection coils between themselves and the second detection coils between themselves, so as to generate an analog position signal between these first and second detection coils.
Claim 3
Dependent Claim
68 words
A proportional coder in accordance with claim 1, characterized in that one ramp angular extension is broader than that of the other ramp, the high points of the two ramps having the same height, and being disposed on the same rotor radius, and the low points of the two ramps being on a same second radius of the rotor not located within the extension of the first radius.
Claim 4
Dependent Claim
29 words
A proportional coder in accordance with claim 1, characterized in that the stator is an insulating disc and the excitation and detection coils are printed circuits on said rotor.