A stator structure includes a stator core including a plurality of tooth sections, coils wound around the respective plurality of tooth sections via an insulator, and a first coil cover and a second coil cover that cover the coils from both sides in an axial direction of the stator core. The first coil cover and the second coil cover being coupled via the insulator.

Improved means and methods to sense rotation using magnetic field sensors, inductance sensing and capacitive sensing employ a user interface comprising a knob and an integrated circuit containing a magnetic field sensor and inductance measuring circuitry. A permanent magnet and a metal member are attached to the knob, allowing detection of rotation of the knob and when the knob is depressed. A first press is interpreted as an activation command, a subsequent rotation is detected, indicated and stored, a second press is interpreted as a deactivation command and a third press is interpreted as a command to reactivate and automatically select a specific rotational position.

A magnetic sensor, a sensor arrangement including a magnetic sensor of this type, and a method for determining the position of a magnetically active element. In the sensor, multiple measuring coils are connected in series along a path, such that the position of a magnetically active element along the path can be measured.

The invention relates to a circuit for detecting a variation in inductance of the magnetic circuit of an inductive displacement sensor, wherein the detector circuit comprises:

a first flip flop arranged to supply a first signal comprising a voltage pulse of necessary and sufficient duration to charge the coil to a threshold current, wherein the first signal is applied to a first terminal of the coil

a pulse generator configured to supply a reference signal comprising a reference pulse

a clock signal generator arranged to trigger the charge pulse and the reference pulse periodically and simultaneously

a second flip flop arranged to generate an output signal taking the status of the first signal on the trailing edge of the reference pulse.

The present disclosure describes a two-stage method for estimating an angle offset of an angle sensor in a system comprising a permanent-magnet synchronous motor. An initial value for the estimated angle offset is first determined with a short circuit test. Next, a torque of the motor may be controlled so that the motor is maintained at a zero speed. Minor adjustments are made to the value of the angle offset to find a minimum magnitude of stator current. A value at which the stator current is at its minimum is used as a final angle offset.

A sensor includes a ferromagnetic shield, at least one sensor coil disposed around an exterior of the ferromagnetic shield, and an electronics module within the ferromagnetic shield. The electronics module is configured to determine the position and/or orientation of the sensor based at least in part on a measurement of a signal induced in the at least one sensor coil.

A magnetic field sensor includes a back bias magnet to generate a DC magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. The first and second magnetic field sensing elements generate first and second electronic signals, respectively, in response to first and second sensed magnetic fields corresponding to the DC magnetic field but influenced by the at least one ferromagnetic surface. The magnetic field sensor generates a difference signal that is a difference of amplitudes of the first and second electronic signals. The difference signal is indicative of a rotation measurement of an absolute relative rotation of the ferromagnetic target object and the magnetic field sensor about a rotation axis.

A sensor device for ascertaining at least one rotation characteristic of a rotating element is provided. The sensor device includes at least one trigger wheel which is able to be connected to the rotating element. The rotating element and the trigger wheel have an axis of rotation. The sensor device includes at least one coil array. The coil array encompasses at least one excitation coil and at least one receiver coil. The coil array is situated on at least one circuit carrier. The trigger wheel as a trigger wheel profile. The sensor device is designed to ascertain a change in an inductive coupling between the excitation coil and the receiver coil as a function of a position of the trigger wheel. The circuit carrier is situated coaxially with the axis of rotation of the trigger wheel. The circuit carrier surrounds the trigger wheel at least partially in a circular manner.

The embodiments described herein include systems with a variable reluctance sensor (VRS) interface and methods of their operation. Embodiments of VRS interfaces include a clearing signal generator configured to generate a clearing signal corresponding with the timing of a noise event. The clearing signal may be configured to clear a post-processing circuit.

A planar motor rotor displacement measuring device and its measuring method are provided. The motor is a moving-coil type planar motor. The device comprises probes, two sets of sine sensors, two sets of cosine sensors, a signal lead wire and a signal processing circuit. The method is arranging two sets of magnetic flux density sensors within a magnetic field pitch τ along two vertical movement directions in the rotor located in the sine magnetic field area. Sampled signals of the four sets of sensors are respectively processed with a frequency multiplication operation, four subdivision signals are obtained, the zero-crossing points of the four subdivision signals are detected, and then two sets of orthogonal pulse signals are generated. The pulse number of the orthogonal pulse signals is counted, and phase difference of the two sets of orthogonal pulse signals is respectively detected.