A sensor system for determining at least one rotation characteristic of an element rotating about at least one rotation axis includes at least one sensor wheel having a profile and being connectable to the rotating element; and at least one inductive position sensor including at least one coil arrangement that includes at least one excitation coil and at least two receiver coils, where at least in sections of the at least two receiver coils have a sinusoidal shape.

The present invention relates to a magnet unit including: a tubular holder having a central axis; and a magnet formed inner region of one end side of the tubular holder, in which the magnet includes a protruding portion at a corner portion where an end surface of the magnet in a central axis direction intersects with an outer peripheral surface of the magnet, which is provided along an inner peripheral surface of the tubular holder, and the protruding portion protrudes in the central axial direction.

Magnetic field generating unit 2 is fixed to object 7 that moves relative to magnetic field detecting means 3. Magnetic field generating unit 3 has magnetic field generator 4, first support structure 5 that is fixed to object 7 and second support structure 6 that is independent of first support structure 5. Second support structure 6 is supported by first support structure 5 and supports magnetic field generator 4. For example, second support structure 6 is formed of a nonmagnetic material, and magnetic field generator 4 is arranged away from first support structure 5.

An encoder includes a base section, a spindle gear attached to a turning shaft section, a counter-shaft gear configured to mesh with the spindle gear and including a cylindrical gear section, a magnet provided in the counter-shaft gear, and an annular bearing member provided in the base section and configured to support the counter-shaft gear. When a straight line extending along the shaft section is represented as a first axis and a straight line orthogonal to the first axis is represented as a second axis, the magnet is disposed to overlap the bearing member in a plan view from a direction in which the second axis extends.

An encoder includes a base section, a spindle gear attached to a turning shaft section, a counter-shaft gear configured to mesh with the spindle gear and including a cylindrical gear section, a magnet provided in the counter-shaft gear, and an annular bearing member provided in the base section and configured to support the counter-shaft gear. When a straight line extending along the shaft section is represented as a first axis and a straight line orthogonal to the first axis is represented as a second axis, the magnet is disposed to overlap the bearing member in a plan view from a direction in which the second axis extends.

A magnetic field sensor includes a sensor and a processing circuit. The sensor is designed to generate on the basis of a varying magnetic field an oscillation signal that fluctuates around a mean value. The processing circuit is designed to generate an output signal on the basis of the oscillation signal. The processing circuit is designed, in a high-resolution mode different than a low-resolution mode, in each case to generate a mean value crossing pulse in the output signal when the oscillation signal attains the mean value, and to generate in each case a limit value crossing pulse in the output signal when the oscillation signal attains at least one limit value different than the mean value. A pulse width of at least either the mean value crossing pulse or the limit value crossing pulse is set to indicate that the magnetic field sensor is operating in the high-resolution mode.

A rim magnet arrangement for fixing on a stem of a valve. The rim magnet arrangement includes a magnet, and a fixing device, which is configured to fix the magnet on the stem of the valve in an axial direction of the stem, and an anti-twist protection, which is configured to fix the magnet in a circumferential direction of the stem.

Systems, methods, and apparatuses for magnetic field sensors with self-test include a detection circuit to detect speed and direction of a target. One or more circuits to test accuracy of the detected speed and direction may be included. One or more circuits to test accuracy of an oscillator may also be included. One or more circuits to test the accuracy of an analog-to-digital converter may also be included. Additionally, one or more IDDQ and/or built-in-self test (BIST) circuits may be included.

Systems, methods, and apparatuses for magnetic field sensors with self-test include a detection circuit to detect speed and direction of a target. One or more circuits to test accuracy of the detected speed and direction may be included. One or more circuits to test accuracy of an oscillator may also be included. One or more circuits to test the accuracy of an analog-to-digital converter may also be included. Additionally, one or more IDDQ and/or built-in-self test (BIST) circuits may be included.

A magnetic encoder in which a support member and a plastic magnet do not adhere to each other is manufactured using a mold. The plastic magnet has a turning molded portion on the outer circumferential side thereof. The gate of the mold is an inner-diameter-side disk gate and a length L thereof in the axial direction is in a range of 0.2 mm≤L≤0.6 mm. The tensile strength of the material of the plastic magnet is 65 MPa or more and the Young's modulus thereof is 4000 MPa or more and 15000 MPa or less. The method includes a step of opening the mold and placing the support member as an insert object in the mold, and a step of closing the mold and injecting a melted material of the plastic magnet into a cavity through the disk gate.