A magnetic induction circuit, a magnetic-controlled switch circuit, a magnetic-controlled device and a magnetic-controlled lamp. The magnetic induction circuit includes a magnetic induction module, a voltage comparison module and a voltage output module. The magnetic induction module is configured to sense an external magnetic field to generate a first voltage signal. The voltage comparison module is configured to receive the first voltage signal, and output a second voltage signal. The voltage output module is configured to process the second voltage signal and output a third voltage signal.

A first sensor signal and a second sensor signal are provided by a sensor unit to an evaluation unit. The first sensor signal is dependent on the angular position and is associated with a first detection position, and the second sensor signal is associated with a second detection position lying about the rotational axis perpendicular to the first detection position. An orthogonal error is converted by the evaluation unit into an amplitude difference between respective amplitudes of the first and second sensor signals based on a coordinate transformation of the first and second sensor signals. Each of the first and second sensor signals are adjusted by the evaluation unit based on the amplitude difference. An angular position of a rotational component is determined by the evaluation unit based on output from an a tan 2-function that takes the adjusted first and second sensor signals as input.

A magnetic linear position detector includes a stator and a mover that is movable along a first direction with respect to the stator. One of the stator and the mover is provided with a magnetic detector. The other of the stator and the mover is provided with a magnet having a first face facing the magnetic detector. The first face is magnetized in such a manner that a magnetization direction changes in an arc shape around a magnetization center point. The magnetic detector is an element whose output changes depending on a direction of a magnetic field.

A rotary encoder is incorporated in an annular space formed between a hollow rotating shaft and an encoder case. The rotary encoder has an annular printed wiring substrate, a plurality of mounting substrates that are outward from the printed wiring substrate in the radial direction and are arranged in the circumferential direction, and inter-substrate wiring cables bridged between the printed wiring substrate and each of the mounting substrates in the radial direction. Power supply to the mounting substrates and signal transmission and reception between the mounting substrates can be accomplished without routing around the wiring cables. It is possible to achieve a rotary encoder that is suitable for being incorporated in a narrow annular space.

A magnetic field angle sensor includes a coil configured to generate a magnetic field that induces an eddy current in a rotatable target, a first magnetic field sensing structure positioned proximate to the coil and configured to detect a reflected magnetic field generated by the eddy current induced in the target, a second magnetic field sensing structure positioned proximate to the coil and configured to detect the reflected magnetic field generated by the eddy current induced in the target, wherein the first and second magnetic field sensing structures are configured to detect quadrature components of the reflected magnetic field, and a processing module configured to process the reflected magnetic field detected by the first and second magnetic field sensing structures for determining an angular position of the target.

A sensor arrangement detects an angle of an actuator which is rotationally arranged on a support. The arrangement includes a first sensor element and a second sensor element. The first sensor element can be coupled to the actuator in order carry out a movement with respect to the support in accordance with a rotation of the actuator. The second sensor element can be rotationally fixed on the support and can be coupled to the first sensor element in order to produce, when rotating the actuator and a thus resulting movement between the first sensor element and the second sensor element, a sensor signal which is dependent on the rotation carried out by the actuator.

A position detection element includes an exchange coupling film having a large exchange coupling magnetic field and a position detection apparatus showing good detection accuracy in a high temperature environment. The position detection element includes an exchange coupling film composed of a fixed magnetic layer and an antiferromagnetic layer stacked on the fixed magnetic layer. The antiferromagnetic layer includes an X(Cr—Mn) layer containing X that is one or more elements selected from the group consisting of platinum group metals and Ni and containing Mn and Cr. The X(Cr—Mn) layer includes a PtMn layer as a first region relatively closer to the fixed magnetic layer and a PtCr layer as a second region relatively farther from the fixed magnetic layer. The content of Mn in the first region is higher than the content of Mn in the second region.

A fixing structure includes a housing including a first hole, an input member including a second hole, and rotating relative to the housing, depending on input of rotational force, a torsion spring being biased so as to return, to a predetermined reference position, a position of the input member relative to the housing, and a fixing member inserted into the first hole and the second hole in a state where the input member is rotated against biasing force of the torsion spring from the reference position to a predetermined rotational position. The fixing member includes a first insertion portion including a part press-fitted into and fixed to the first hole, and a second insertion portion including a part inserted into the second hole, and fixes the input member at the predetermined rotational position.

Examples described herein provide a computer-implemented method for predicting a state of a hall sensor for a motor having a plurality of hall sensors associated therewith. The example method includes receiving a previous state of the hall sensor. The example method further includes detecting a current state of the hall sensor. The example method further includes predicting a predicted next state of the hall sensor based on the previous state of the hall sensor, the current state of the hall sensor, and a direction of a shaft of the motor.

A system and method for redundantly monitoring faultless functioning of first and second rotational speed sensors on an electric motor, where the rotational speed is to precisely determine and monitor a rotor position, where a first product is formed from a first current count of the first output signal of the first sensor and a maximum count of the second output signal, a second product is formed from a second current count of the second output signal of the second sensor and a maximum count of the first output signal, the two products are cyclically checked for equality and, in when the check is negative, an error message is generated, where the method provides the position of both sensors in a common values system and the positions can be directly compared with one another such that precise determination and monitoring of the rotor position becomes possible.