Abstract: A rotation-angle sensor comprises a stator element and a rotor element mounted to rotate relative to the stator element about an axis of rotation. The rotation angle is detectable by an inductive coupling between the rotor element and the stator element. A compensation element is located on the stator element and has a compensation transmitter coil to emit an electromagnetic compensation alternating field and a compensation receiver coil to receive electromagnetic alternating fields. The rotor element has a first electrically conductive portion, which is both located on the rotor element and inductively coupled to the compensation transmitter coil and the compensation receiver coil such that when the compensation transmitter coil emits the electromagnetic compensation alternating field, an alternating voltage induced in the compensation receiver coil is primarily dependent on a relative mutual radial location of the stator element and the rotor element with respect to the axis of rotation.

Abstract: A coil assembly includes a coil winding and a multilayer printed circuit board. The coil winding has multiple loops that are arranged in different layers of the printed circuit board and form a main magnetic field with a main measuring direction perpendicular to a main plane of the printed circuit board. The loops arranged in different layers are electrically connected together via at least one via. The printed circuit board has at least four vias or a whole-number multiple of four vias that form an equal number of reverse current paths and forward current paths between the loops of the coil winding. Each pair of vias with the same current path direction is arranged point-symmetrically relative to a common mirror point such that magnetic loops that are formed on printed circuit board secondary planes arranged perpendicularly to the main plane have opposite directions and compensate for one another.

Abstract: A determination device for determining a value representing a dose of a dose metering device includes an eddy-current-based rotational angle sensor. The rotational angle sensor can be coupled to a rotatable dosing knob of the dose metering device and can image a rotational angle of the dosing knob representing the dose in a rotational angle signal. The determination device further includes an analysis device that can establish the value of the dose using the rotational angle signal.

Abstract: A rotational angle sensor includes a stator element and rotor element. The stator element has a stator transmitting coil, circuit board, and at least two identically configured stator receiving coils angularly offset from each other on the circuit board. The rotor element is mounted rotatably about a rotation axis relative to the stator element, and has a rotor receiving coil and rotor transmitting coil electrically connected to each other. The rotor receiving coil is inductively coupled to the stator transmitting coil such that an electromagnetic field produced by the stator transmitting coil induces a current in the rotor receiving coil that flows through the rotor transmitting coil and causes the rotor transmitting coil produces a further electromagnetic field.

Abstract: A rotational angle sensor includes a stator element and a rotor element. The stator element has a stator transmitting coil, a stator circuit board with first and second planes, and at least two identically configured stator receiving coils arranged within the stator transmitting coil on the stator circuit board angularly offset from each other. The rotor element is mounted rotatably about a rotational axis relative to the stator element. The stator transmitting coil is inductively coupled to the stator receiving coils via the rotor element such that the inductive coupling is configured with reference to a rotational angle between the stator element and the rotor element so that the stator transmitting coil induces at least two angle-dependent alternating voltages in the stator receiving coils. The stator transmitting coil has coil conducting tracks positioned on the first and second planes of the stator circuit board.

Abstract: A rotational angle sensor includes a stator element, and rotor element. The stator element has a stator transmitting coil and a stator receiving coil. The rotor element is mounted rotatably about a rotation axis relative to the stator element, and has a rotor receiving coil and a rotor transmitting coil electrically connected with each other. The rotor receiving coil is inductively coupled to the stator transmitting coil such that an electromagnetic field produced by the stator transmitting coil induces a current in the rotor receiving coil that flows through the rotor transmitting coil and causes the rotor transmitting coil to produce a further electromagnetic field. The stator receiving coil is inductively coupled to the rotor transmitting coil such that the inductive coupling is configured with reference to a rotational angle between the stator element and the rotor element so that the further electromagnetic field induces at least one angle-dependent alternating voltage in the stator receiving coil.

Abstract: A rotational angle sensor includes a stator element and a rotor element. The stator element has a transmitting coil and at least two receiving coils that are arranged within the transmitting coil and on a circuit board. The rotor element is mounted for rotation with respect to the stator element about an axis of rotation. The rotor element is configured to inductively couple the transmitting coil to the at least two receiving coils in such a way that the inductive coupling is dependent on a rotational angle between the stator element and the rotor element and the transmitting coil induces at least two angle-dependent alternating voltages in the at least two receiving coils. The rotor element and the at least two receiving coils are configured in such a way that an alternating voltage, the amplitude of which is sinusoidally dependent on the rotational angle, is induced in the receiving coils.

Abstract: A linear-displacement sensor includes a base element arranged with a sensor coil and an excitation coil in such a manner that an AC voltage is induced in the sensor coil upon application of an AC voltage to the excitation coil. An at least partly electrically conductive sliding element is configured to be shifted relative to the base element in a direction along the measurement path. The sliding element has a variable geometry along the measurement path to inductively couple partial turns of the sensor coil with the excitation coil. A correction coil is arranged above a geometry of the sliding element so that an inductive coupling of the correction coil and hence an amplitude of an AC voltage induced in the correction coil is dependent on a lateral offset of the sliding element in relation to the base element.

Abstract: A method for determining a sensor coil inductance of an eddy current sensor using an LC oscillator circuit includes determining the sensor coil inductance via integration, as a function of an oscillation frequency and a resonance capacitance of the LC oscillator circuit. The method further includes detuning, at least once, the oscillation frequency during the integration.

Abstract: An angular position sensor includes a stator element with at least three coils, a rotor element rotatably mounted with respect to the stator element, and an evaluation unit configured to determine an angle of rotation between the rotor element and stator element. The rotor element is configured to inductively couple with each of the at least three coils with varying strengths based on the angle of rotation. The evaluation unit is further configured to supply the coils with alternating voltage in a cyclical manner and in sequence, so that a first respective part of the coils is supplied with alternating voltage and a remaining part is de-energized. The evaluation unit is additionally configured, in a cyclical manner in sequence with one or more de-energized coils, to detect at least one of a respective phase and an amount of an induced alternating voltage, and to determine the angle of rotation therefrom.

Abstract: A method for determining an injection process of an injection appliance includes injecting a fluid with the injection appliance and applying an electrical signal to at least one helical spring of the injection appliance coupled to a dosing wheel of the injection appliance. The method also comprises detecting an inductance value of the at least one helical spring. A number of windings of the at least one helical spring is dependent on a set rotation angle of the dosing wheel. The set rotation angle corresponds to a dose quantity of the fluid that is preselected for the injection process. The method moreover includes making available a determination signal representing the determined injection process, using the detected inductance value.

Abstract: An air spring device for a vehicle includes a cover element, base element, spring-elastic sleeve, and distance sensor unit. The sleeve, together with the cover and base elements, defines an internal space, and includes a first section forming a first spring element having a first length and first spring constant and a second section forming a second spring element having a second length and second spring constant. The distance sensor unit is positioned in the internal space, is configured to determine a distance between the cover element and base element, and includes a measured value encoder and measured value pickup. A first of the encoder and pickup is positioned on the cover or base element. A second of the encoder and pickup is coupled to the cover element via the first spring element and to the base element via the second spring element.

Abstract: An object identification system comprises a transceiver (1) and a transponder (30) including memories (33,34) for storing an identification code identifying the transponder. Circuits (35, 36, 37, 38) generate an identification signal representative of the identification code such that the identification signal is modulated by bits of the identification code. Circuits (8, 9, 10, 11, 12) of the transceiver receive and interpret the identification signal. The transponder includes a variable code generator (32) and a controller (31) for controlling the writing of the variable code into memory (33) so that the variable code constitutes part of the identification code. The variable code may be a random or pseudo-random code.

Abstract: A three row drying cylinder group for a drying section of a paper machine or the like. The bottom cylinder row felt only passes through the bottom row. The top cylinder row felt passes from the top row, wraps the first middle row cylinder as a deflection element, passes over the next top row cylinder, and then is guided so that the opposite side of the top felt passes the next middle row cylinder and is guided back to the top row to alternate between the two ways of passing the middle row cylinders. Those middle row cylinders which are deflection elements may be heated or not and may deliver suction or vacuum to hold the web to the felt.