An exemplary encoder assembly includes a substrate, a first encoder, and a second encoder. The substrate has two or more position sensors, each position sensor being configured for detecting a rotary position of a shaft or other rotating element of a machine. The first encoder includes at least one first position sensor of the two or more position sensors. The at least one first position sensor is disposed on the substrate for off-axis alignment with the shaft or other rotating element of the machine. The second encoder includes a second position sensor of the two or more position sensors, the second position sensor being disposed on the substrate for on-axis or off-axis alignment with the shaft or other rotating element of the machine. Each position sensor is configured to detect different or common signal types, and a signal type of the second position sensor excludes optical signals.

Some embodiments include an absolute displacement detection device configured to calculate, from a plurality of displacement detection signals provided by a plurality of displacement detection mechanisms that detect displacement amounts, an absolute periodic signal having an absolute periodic signal period larger than displacement detection signal periods of the plurality of the displacement detection signals. Other embodiments of related devices and methods are also disclosed.

A rotary element is equipped with a pattern representing a reflected binary code on at least three bits. A detection circuit is configured to sense the pattern and deliver an incident signal encoded in reflected binary code on at least three bits. The incident signal is converted by a transcoding circuit into an intermediate signal encoded in reflected binary code on two bits. A decoding stage decodes the intermediate signal and outputs at least one clock signal representing the amount of rotation of the rotary element and a direction signal representing the direction of rotation. A processing circuit determines the movement of the rotary element, and has at least one general purpose timer designed to receive the at least one clock signal and direction signal.

A rotary encoder for measuring absolute rotation around an axis of the rotary encoder, comprising: a magnetised element comprising first and second surfaces at an angle to one another; a first magnetic track provided on the first surface and a second magnetic track provided on the second surface, wherein the first and second magnetic tracks subtend an angle θ around the axis of the rotary encoder, wherein each magnetic track comprises a number of magnetic pole pairs, a magnetic pole pair being formed of two poles defining regions of opposite magnetic polarization, wherein the number of magnetic pole pairs in each track are different and have a greatest common factor of one; and first and second magnetic sensor arrangements, the first magnetic sensor arrangement arranged to detect a magnetic field of the first magnetic track and the second magnetic sensor arrangement arranged to detect a magnetic field of the second magnetic track, wherein the magnetic sensor arrangements are rotatably coupled to the magnetised element around the axis of the rotary encoder.

A magnetic position detection device includes two magnetic scales 1a, 1b on which N and S magnetic poles are disposed alternately, magnetism sensing element groups 2a, 2b for measuring variation in magnetic fields formed respectively by the magnetic scales 1a, 1b, and a position calculation device 3 for calculating absolute positions of magnetism sensing elements 21 on the magnetic scales 1a, 1b from output values output by the magnetism sensing elements 21, wherein a difference between the respective numbers of magnetic poles on the magnetic scales 1a, 1b is 2, and the magnetism sensing elements 21 are disposed such that arrangement intervals between the magnetism sensing elements 21 of the respective magnetism sensing element groups 2a, 2b each take a value obtained by dividing a length of one magnetic pole equally by the number of magnetism sensing elements 21.

The present disclosure provides an input device and control method thereof. The input device includes a roller module, a relative encoder, an absolute encoder, and a processor. The control method includes: obtaining current angle data outputted by the absolute encoder according to a target phase of at least one signal outputted by the relative encoder; obtaining a current position number corresponding to the current angle data according to the current angle data; calculating a number difference according to the current position number and a previous position number; and outputting the number difference.

Wireless transmission of wheel rotation direction is disclosed. A disclosed apparatus includes a tone ring exhibiting a rotational asymmetry and a detector to measure a rotational direction of a wheel of a vehicle based on the rotational asymmetry and to measure a rotational speed of the wheel, where the detector or the tone ring is operatively coupled to the wheel. The disclosed apparatus also includes a wireless transmitter to transmit the rotational direction and the rotational speed to a receiver proximate or within an engine compartment of the vehicle.

A device includes a permanent magnetic material extending along a path, a first magnetic angle sensor configured to output at least a first signal and being positioned remotely from the material, and a second magnetic angle sensor configured to output at least one second signal and being positioned remotely from the material and from the first magnetic angle sensor. Based on the at least one first signal and the at least one second signal, a relative positioning of the first magnetic angle sensor and the second magnetic angle sensor with respect to the material in parallel to the path is determined. The magnetization of the material has a periodicity that varies along the path.

A displacement measuring system is disclosed. The system may implement a code carrier formed from a data storage medium which includes a relative displacement measurement code channel which is an arrangement of pit lines and bump lines. A composite subsystem may include an optical laser assembly, a signal processing unit, and a power driver, and can scan and decode the code carrier by focusing a laser beam on the code carrier and obtaining a group of radio frequency electric signals from the reflection of the laser beam which represents the bumps and pits of the code carrier. A central control and signal output unit can process the electric signals produced by multiple composite subsystems and output information representing incremental and absolute displacement.

A sensor is provided for determining at least one rotation characteristic of a rotating element. The sensor includes a sensor wheel, which is connectable to the rotating element, including at least one first reading track. The reading track includes a first plurality of magnetic event timers. The sensor furthermore includes at least one magnetic sensor for detecting magnetic events generated by the first plurality of magnetic event timers. The first reading track is designed in such a way that, over a complete circumference of the sensor wheel, a magnetic field strength of the first plurality of event timers changes step-by-step from a first maximum north pole to a first maximum south pole.