In an electric motor control device which controls rotation of an AC electric motor having two sets of three-phase windings and provided with a resolver having two systems by calculating voltage command values on dq axes, dq conversion of currents of first three-phase windings is performed using a first angle calculated from output of the first system of the resolver, and dq conversion of currents of second three-phase windings is performed using a second angle calculated from output of the second system of the resolver. With both d-axis current command values set at the same value, respective voltage command values on dq axes are calculated and respectively converted into voltage command values for voltage application to the first three-phase windings, using the first angle, and converted into voltage command values for voltage application to the second three-phase windings, using the second angle.

Apparatuses, systems, and methods for sensing rotary positions are provided. For example, an example rotary position sensor includes a rotor assembly having a rotor assembly opening for securing the rotor assembly to a shaft structure, a stator assembly having a stator assembly opening for receiving the shaft structure, and a base assembly secured to the stator assembly. In some examples, the base assembly (such as, but not limited to, a PCB assembly) comprises a plurality of primary coil elements printed on a first side of the base assembly and a plurality of secondary coil elements printed on a second side of the base assembly.

In accordance with one embodiment of the present disclosure, an inductive sensor assembly is provided. The inductive sensor assembly includes a housing formed of a magnetic plastic material and a sensor assembly having a transmitter coil and a receiving coil. The housing encapsulates the transmitter coil and the receiving coil. A movable target having a magnetic material is spaced apart from the housing and is configured to move along a predetermined trajectory relative to the housing. When the target is moved along the predetermined trajectory, the movement causes an area of low permeability in regions of the housing that is sensed by the receiving coil to determine the location of the target with respect to the housing.

An inductive position detector for stylus position measurement in a scanning probe comprises a coil board configuration located along a central axis in the probe. The coil board configuration includes a field generating coil configuration that surrounds a hole in the coil board configuration, a top axial sensing coil configuration and a bottom axial sensing coil configuration, and N top rotary sensing coils and N bottom rotary sensing coils. A stylus-coupled disruptor configuration includes a cylindrical disruptor element that is configured to move and fit within the hole of the coil board configuration, and moves along Z (axial) and X-Y (rotary) directions in a motion volume. The field generating coil configuration generates a changing magnetic flux (e.g., encompassing all or at least part of the cylindrical disruptor element), and coil signals indicate the cylindrical disruptor element and/or stylus positions.

Methods, apparatuses and systems for providing a position sensing component are disclosed herein. An example position sensing component may comprise: a sensing coil; a moveable core disposed within the sensing coil; an oscillator circuit; and a feedback control circuit coupled to the oscillator circuit, wherein the position sensing component is configured to: maintain a fixed amplitude voltage in response to a variable current signal provided by the oscillator circuit in conjunction with the feedback control circuit, and generate an oscillator circuit output signal that is linearly proportional to a position of the moveable core with respect to the sensing coil.

An eddy current sensor for a rotary shaft and a rotary shaft apparatus. The eddy current sensor includes: a housing; one or more position detecting probes provided on the housing; and a rotating speed detecting probe provided on the housing. The eddy current sensor integrates the position detecting probe and the rotary speed detecting probe, such that while the eddy current sensor is detecting position displacement of the rotary shaft, the eddy current sensor may also simultaneously detect the rotating speed of the rotary shaft, which facilitates detecting and monitoring the rotary shaft more comprehensively. The detected position data and rotating speed data of the rotary shaft correspond to each other at any time, such that the working state of the rotary shaft may be analyzed more intensively.

A non-volatile, absolute rotation sensor employs a radial guide and spiral guide rotating with respect to each other to move a marker element continuously along the radial guide so that a distance of the marker element along the radial guide provides an indication of shaft movement over multiple turns. A sensor system senses the distance of the marker element along the radial guide to provide an electric output.

To provide an angle detection apparatus which can reduce the error of the angle which is caused by the eccentricity, by performing the reduction processing about smallest possible number of frequency bands and the lowest possible order of frequency band. An angle detection apparatus performs a first-order component reduction processing which reduces a first-order component which is a component of one rotation period in a mechanical angle of the rotor, to each of the first system two output signals; and calculates a first angle (θ1) of the rotor, based on the first system two output signals to which the first-order component reduction processing was performed.

A nonvolatile, absolute multi-turn rotation sensor employs a magnetic particle that is indexed around a serpentine channel with successive passes of a magnet caused by rotation of the rotation sensor shaft. Sensors at regular locations around the track allow determination of the position of the magnetic particle and thus the total number of revolutions of the shaft.

A scanning probe for a coordinate measurement machine includes a stylus suspension module, a stylus position detection module, a disruptor configuration, and a signal processing and control circuitry module. The stylus position detection module includes a sensor configuration, which comprises various coils, and a shield configuration that is located around the sensor configuration and comprises electrically conductive material for shielding the sensor configuration. The stylus position detection module is mounted to the stylus suspension module utilizing a module mounting configuration, which enables the relative position of the sensor configuration to be adjusted for alignment during the assembly of the scanning probe.