A method is provided for operating a linear drive system having primary and secondary parts. The primary part includes an energizable electromagnet device. The secondary part includes a magnet arrangement. A magnetic interaction between the electromagnet device and the magnet arrangement can be caused to move the primary and secondary parts relative to one other. The primary part has a sensor device for detecting a magnetic field generated by the magnet arrangement. In an initial measurement, the magnetic field is detected at different positions of the primary part, and position-dependent reference magnetic field data are provided. A position determination is carried out, in that the magnetic field is detected at a current position of the primary part and current magnetic field data are provided, and, based on the reference magnetic field data and the current magnetic field data, the current position of the primary part is determined.

Thrombectomy systems including a stroke length detection assembly. An illustrative drive unit for a thrombectomy system may comprise one or more panels enclosing an internal structure of the drive unit, a vertically oriented reciprocating linear actuator assembly extending between one or more support structures in an upper region of the drive unit and including a reciprocating linear actuator secured to a mounting plate and an actuator shaft, a bracket including a first portion extending generally parallel to a longitudinal axis of the actuator shaft and a second portion extending generally orthogonal to the longitudinal axis of the actuator shaft, the second portion coupled to the actuator shaft, a magnetic strip affixed to a surface of the first portion of the bracket, and a magnetic sensor positioned adjacent to a first end region of the bracket. The magnetic sensor may be configured to determine a relative position of the actuator shaft.

A position detection device, configured to detect a position of a shaft that moves forward and backward in an axial direction, is provided with an excitation coil that generates an alternating magnetic field; a target fixed to the shaft and interlinked with a magnetic flux of the alternating magnetic field; and a detection coil in which the magnetic flux of the alternating magnetic field is interlinked. The detection coil has a first portion and a second portion in which an induced voltage is generated when the magnetic flux of the alternating magnetic field is interlinked, and a connection portion connecting the first portion and the second portion. The first portion and the second portion respectively extend along a coil longitudinal direction parallel to the axial direction, and at least a portion of each is aligned perpendicular to the coil longitudinal direction. The target has at least one first target portion facing the first portion and at least two second target portions facing the second portion, with the at least two second target portions being spaced apart in the axial direction. An induced voltage generated in the first portion varies with a position of the first target portion with respect to the first portion, and an induced voltage generated in the second portion varies with a position of the second target portion with respect to the second portion. The first target portion is located between the at least two second target portions in the axial direction, and when the shaft is in a central position between one axial moving end and an other axial moving end, the first target portion faces a central part in the coil longitudinal direction of the first portion.

Disclosed herein is a displacement detection system for a brake pedal. The system includes a displacement detection device including a pedal wake up sensor detecting the change in magnetic flux to generate a wake up signal for activating a control device, and a pedal travel sensor having a plurality of detectors that independently detect the magnetic flux, and detecting a change in magnetic flux to measure a stroke of the brake pedal, and is configured to verify reliability of a measurement value that is measured by each of the plurality of detectors of the pedal travel sensor using a measurement value of the pedal wake up sensor.

An inductive position sensor includes a primary winding, a first secondary winding, and a second secondary winding superimposed on the first secondary winding, wherein each turn comprises two turn segments referred to as transverse segments, each oriented substantially perpendicular to a longitudinal axis, and at least two segments referred to as longitudinal segments arranged each time between two transverse segments, and the transverse segments are irregularly distributed along the longitudinal axis. An area of the sensor having along the longitudinal axis a density of transverse segments substantially higher than the density of segments outside of the area.

A cylinder actuator includes two elements mobile one relative to the other along an axis of movement and a position sensor configured to measure the relative position of the two elements, the position sensor comprising a multi-pole magnetic strip secured to a first of the two elements and a sensitive element sensitive to magnetic-field variations and secured to a second of the two elements, the multi-pole magnetic strip having an alternation of north and south poles extending in an interval that defines a measurement range for the measurement of the relative position along the axis of movement, the sensitive element being arranged in such a way as to detect variations in the magnetic field in the vicinity of the multi-pole magnetic strip along the axis of movement within the interval.

A position detector includes a position detection magnet unit installed at each of a plurality of carriers, and a position detection unit. The position detection magnet unit includes a plurality of magnets disposed such that different magnetic poles are arranged alternately in a transport direction of the carriers, and side magnetic shielding portions installed at the ends of the position detection magnet unit. The position detection unit includes: a processing substrate disposed in parallel to the transport direction of the carriers; a plurality of magnetic detection elements disposed side by side in the transport direction of the carriers on a front side of the processing substrate; and a substrate-side magnetic shielding portion opposite the magnetic detection elements, the substrate-side magnetic shielding portion being installed on a back side of the processing substrate.

An absolute position detection device includes: a scale unit having a first member and disposed on a mover or a stator; a sensor unit having detection elements disposed at a first interval to detect position correspondence information corresponding to the first member; and a computation unit that: detects a distortion boundary position of output based on a comparison result between the position correspondence information by first and second detection elements; based on element coordinates of either the first or second detection element, element coordinates of a third detection element, the first interval, a length of the output pairs, and the position correspondence information by the third detection element, calculates a position of the third detection element to an end position of the first member; and calculates a positional relationship between the mover and the stator based on the calculated position and a length of the first member.

A sensor device for detecting at least one physical variable, comprising a housing, at least one sensor element arranged in the housing, at least one circuit board arranged in the housing and comprising a circuit arrangement, and at least one input device arranged on the housing for carrying out input operations which are processed in the circuit arrangement to influence the sensor properties, is characterised in that the input device, to realise a touch-sensitive effect, comprises an actuation area, which is arranged on a housing wall and is permeable to electric fields, and a capacitive area, which is arranged on the circuit board or is formed as part of the circuit board, and in that the circuit board is arranged in the housing such that the capacitive area lies directly below the actuation area.

A magnetic field sensor with a magnet is disposed proximate to a ferromagnetic target object having at least one ferromagnetic surface. The magnetic field sensor is operable to sense a relative location between the magnetic field sensor and the ferromagnetic target object along a movement line. In some embodiments, the target object is also spinning about a rotation axis parallel to the movement line. A corresponding method is described.