| 摘要 |
The invention relates to a device for detecting the position of an object subjected to a linear displacement, characterised in that it comprises at least one sensor having a stationary part and a mobile part, the stationary part comprising: - an E-shaped magnetic circuit 10 comprising three parallel branches 11, 12, 13: . a central branch 11 comprising a first winding 11A, having m turns, supplied by an oscillator 20 at a frequency f, . a second branch 12 comprising a second winding 12A of n turns, . a third branch 13 comprising a third winding 13A of N turns with N = n' + n and n' close to n, . the second and third windings being connected in series and wound in opposite directions so that the voltages induced in the second and third coils are of opposite senses, . the mobile part comprising a means integral with the object in order to cancel the exchange of magnetic flux between the end of the central branch 12 of the magnetic circuit and the end of its third branch 13, all of which occurring for a precise relative position of the mobile part of the sensor with respect to its stationary part, - and a phase comparator 40 for determining the phase difference between the signal emitted by the oscillator and the signal leaving the circuit constituted by the said second and third windings, allowing the detection of the said relative position. Application in particular to the field of machines subjected to a translational movement.
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