Robert Boschgmbh

Andreas Merz

Fabian Utermoehlen

Stefan Leidich

Thomas Buck

Ingo Herrmann

Oliver Krayl

Michael Stumber

Dayo Oshinubi

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.

Coil assembly and corresponding measuring assembly

A rotational angle sensor includes a stator element and a rotor element. The rotor element is mounted to rotate about a rotation axis. The stator element has a transmitter coil and a receiver coil that are arranged on a circuit board. The receiver coil substantially encloses the rotation axis in a circumferential direction and is formed by a plurality of adjacent partial windings. The partial windings are each formed from sections of two circular-arc-shaped conductor paths curved to the left and two circular-arc-shaped conductor paths curved to the right. A first conductor path curved to the right extends through a first point on a first circle, a second point on a third circle and rotated relative to the first point by a quarter of a measuring range of the sensor, and a third point on a second circle and rotated relative to the first point by half the measuring range.

Rotational angle sensor

A rotational angle sensor includes a stator element and rotor element. The stator element has a stator transmitting coil and stator receiving coil. The rotor element is rotatably mounted 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 to produce a further electromagnetic field. The stator receiving coil is inductively coupled to the rotor transmitting coil such that the inductive coupling between the stator receiving coil and the rotor transmitting coil is configured with reference to a rotational angle between the stator element and the rotor element, and such that the further electromagnetic field induces an angle-dependent alternating voltage in the stator receiving coil. The stator transmitting coil has a first circular outer partial winding, and a first circular inner partial winding positioned within and electrically connected to the first outer partial winding such that the first inner partial winding has an opposite current flow with respect to the first outer partial winding. The rotor receiving coil has a second circular outer partial winding and a second circular inner partial winding positioned within and electrically connected to the second outer winding such that the second inner winding has an opposite current flow with respect to the second outer partial winding. The first and second outer partial windings, and the first and second inner partial windings are oriented with respect to each other, respectively.

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.

Method and device for determining a sensor coil inductance

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.

A rotation angle sensor includes a stator element and a rotor element, which is mounted in a rotatable manner about an axis of rotation with respect to the stator element. A rotation angle is captured via inductive coupling between the rotor element and the stator element. A compensation element is arranged on the stator element. The compensation element has a compensation transmitting coil configured to emit an alternating electromagnetic compensation field and at least one compensation receiving coil configured to receive alternating electromagnetic fields. The rotor element has a first electrically conductive section. The first electrically conductive section is arranged on the rotor element and is inductively coupled to the compensation transmitting coil and to the at least one compensation receiving coil of the compensation element.

Rotation angle sensor having a compensation element

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. The stator receiving coil has at least two circular-ring-sector-shaped partial windings that divide the stator element into sectors. The rotor transmitting coil has a number of sickle-shaped partial windings equal to the number of circular-ring-sector-shaped partial windings, which extend sequentially around the rotation axis.

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.

Angular position sensor

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. The coil conducting tracks on the first plane are interrupted in a passage region, and are connected to diverting tracks on the second plane by vias. The stator receiving coils have connection conductors on the first plane lead from stator receiving coil connections within the stator transmitting coil, through the passage region, and to circuit board connections for the stator receiving coils. Each connection conductor is curved so as to form a conductor loop in order to compensate differently sized coil areas of the stator receiving coils formed by connection conductors of different lengths within the stator transmitting coil.

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. The stator receiving coils are inductively coupled to the rotor transmitting coil in a manner configured with reference to a rotational angle between the stator element and the rotor element so that the further electromagnetic field induces at least two angle-dependent alternating voltages in the stator receiving coils. Each stator receiving coil is formed from a plurality of radial conductors and circumferential conductors that are arranged in two levels of the circuit board such that, for each stator receiving coil, at least two oppositely directed partial windings are formed from the radial conductors circumferential conductors. The radial conductors extend radially from an inner end to an outer end and are arranged on the circuit board in sets of two at least partially overlapping conductors with opposite current directions. Each circumferential conductor extends circumferentially, connects two inner ends or two outer ends of respective radial conductors, and has a via providing a change between the levels of the circuit board.

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.

Determining device for determining a value representing a dose of a dose metering device, and a method for operating same

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.

Linear displacement sensor

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.

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Freiberg am Neckar, Germany

Andreas Merz