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US 12,710,291 B2Granted
Inductive position sensor
AssigneeMelexis Technologies SA
InventorLorenzo Lugani
Life of this patent
Estimating the term…
Abstract
A position sensor is for determining the position of a conductive target using a transmit coil and a plurality of receive coils. The receive coils may each include two strands and a strand may be obtained from a conversion of a substantially sinusoidal primitive function. The position sensor may realize a reduction of harmonics in signals from the receive coils.
Claims8
A linear position sensor for determining a linear position of a conductive target, the position sensor comprising:
- at least one transmit coil;
- a first, second and third receive coil enclosed by the transmit coil, wherein each receive coil has a predefined electrical period which is the same for each receive coil and wherein each receive coil comprises a first conductive strand and a second conductive strand, wherein the first strand is obtained from a primitive function which is scaled given the electrical period, and wherein the primitive function of the second strand is the primitive function of the first strand shifted over 180°, and wherein both strands are electrically connected so that a continuous coil is formed with two open ends, and wherein the primitive function of a strand of the second receive coil is the primitive function of a corresponding strand of the first receive coil shifted over 120°, and wherein the primitive function of a strand of the third receive coil is the primitive function of the corresponding strand of the first receive coil shifted over 240°;
- the conductive target which overlaps the receive coils;
- and
- an integrated circuit which is configured for exciting the transmit coil, thus inducing signals on the receive coils, and for reading the signals from the receive coils or a combination of the signals, and for processing these signals, wherein the position sensor is configured for removing a common mode signal from these signals.
2 more elements
A method of forming a linear position sensor, the method comprising:
- defining a substantially sinusoidal primitive function;
- scaling the primitive function given a predefined electrical period;
- obtaining a second strand from the primitive function shifted over 180°;
- obtaining a second receive coil, wherein the primitive function of a strand of the second receive coil is the primitive function of a corresponding strand of a first receive coil shifted over 120°;
- obtaining a third receive coil, wherein the primitive function of a strand of the third receive coil is the primitive function of the corresponding strand of the first receive coil shifted over 240°;
- providing a conductive target which overlaps the receive coils;
- and
- providing an integrated circuit which is configured for exciting a transmit coil, for reading signals from the receive coils, and for processing these signals, wherein processing the signals comprises removing a common mode signal from these signals.
5 more elements
Dependencies are inferred from the claim text.