An inductive position sensor for determining the position of a moving body along a linear or rotary path (F), including: a moving target (3) adapted to modify an electromagnetic field; a fixed circuit board (5) extending along a limited portion and including a primary coil (7) surrounding two secondary coils (8, 9) having substantially identical lengths (L) and having shapes of sine and cosine functions; a current generator (11) to create an inductive coupling modulated by the position of the target; a detector (13) of the linear or angular position of the target; and a system for balancing the coupling between the primary coil (7) and the secondary coils (8, 9) to compensate for the measurement offset induced by the proximity between the secondary coils (8, 9) and the end segments (7b) of the primary coil (7).

An inductive sensor which includes one or more inductive coils and an inductance to digital converter. The output of the inductive sensor may be used to replace the functions of a switch and a potentiometer to initiate and control various outputs in welding-type systems and applications.

A rotation sensing apparatus includes a detected part, a sensor unit, and a rotation information calculation circuit. The sensor unit includes a first sensor disposed opposite to a first pattern portion, a second sensor disposed opposite to a second pattern portion, a third sensor disposed to be spaced apart from the first sensor in the rotation direction and opposite to the first pattern portion, and a fourth sensor disposed to be spaced apart from the second sensor in the rotation direction and opposite to the second pattern portion. The rotation information calculation circuit is configured to sense the rotation direction, in response to a differential signal, generated based on the first oscillation signal and the second oscillation signal, and an oscillation signal corresponding to maximum and minimum frequencies, from among the first oscillation signal, the second oscillation signal, the third oscillation signal, and the fourth oscillation signal.

A method for defining a measurement range, called the useful span, of the inductive position sensor with emission of a cosine and sine signal by at least one first receiver winding and at least one second receiver winding, respectively. The cosine signal emitted by the one or more second receiver windings is taken as reference signal between the two sine and cosine signals for an adjustment of at least one parameter of the sine signal depending on a corresponding parameter of the cosine signal, at least one of the dimension and positioning parameters of the one or more first receiver windings being configured to generate a sine signal having the at least one parameter of the sine signal adjusted with respect to the cosine signal.

A sensor, which is based on a coupling between a printed circuit board inductance and a number of attachment inductances that are applied using SMD technology.

Rotary position sensors are provided. In one example implementation, a rotary position sensor can include a first member and a second member, one of the first and second members having a transmit aerial and a receive aerial and the other of the first and second members having an intermediate coupling element. The receive aerial has at least one receive conductive winding arranged to form a first set of current loops and a second set of current loops. The intermediate coupling element comprises a conductive material arranged in a pattern. The pattern of the intermediate coupling element and the layout of the first and second set of current loops are mutually arranged such that any electromotive force induced in the first set of current loops by a background magnetic field is substantially balanced by an electromotive force induced in the second set of current loops by the background magnetic field.

A sensor, which is based on a coupling between a printed circuit board inductance and a number of attachment inductances that are applied using SMD technology.

A position measurement system includes a material measure and a sampling device, arranged movably with respect to one another relative to a measurement direction. The material measure includes a multiplicity of markings arranged in a row relative to the measurement direction. The sampling device includes a transmitter winding arrangement and a plurality of receiver coils. The receiver coils are arranged in a row relative to the measurement direction such that inductive coupling between the transmitter winding arrangement and the receiver coils is dependent on a position of the sampling device relative to the material measure. The sampling device further includes an operational amplifier having a first and a second output terminal. The receiver coils are connected via a switching device to the operational amplifier such that a single coil or a pair of receiver coils is configured for selective connection on an input side to the operational amplifier.

Rotary position sensors are provided. In one example implementation, a rotary position sensor can include a first member and a second member, one of the first and second members having a transmit aerial and a receive aerial and the other of the first and second members having an intermediate coupling element. The receive aerial has at least one receive conductive winding arranged to form a first set of current loops and a second set of current loops. The intermediate coupling element comprises a conductive material arranged in a pattern. The pattern of the intermediate coupling element and the layout of the first and second set of current loops are mutually arranged such that any electromotive force induced in the first set of current loops by a background magnetic field is substantially balanced by an electromotive force induced in the second set of current loops by the background magnetic field.

The inductive position detector includes: a stator having a wiring board; a rotor having a non-conductive component disposed in opposed relation to the stator and rotatable relative to the stator about a rotation axis; a conductor pattern held by the non-conductive component so as to have cyclicity (geometrical periodicity) circumferentially about the rotation axis, and movable to pass through a rotation track defined about the rotation axis as the rotor is rotated; and a plurality of chip inductors surface-mounted on a major surface of the wiring board of the stator in opposed relation to the rotation track so as to have different spatial phases with respect to the conductor pattern, and respectively serving as detection coils that detect a magnetic field change occurring due to the passage of the conductor pattern.