A positioning device (101) for producing a position signal indicative of a rotational position of a resolver is disclosed. The positioning device includes a signal interface (102) for receiving alternating signals (V_cos, V_sin) from the resolver and a processing system (103) for generating the position signal based on position-dependent amplitudes of the alternating signals and on polarity information indicative of a polarity of an excitation signal (V_exc) of the resolver. The processing system is configured to recognize a polarity indicator, such as a change of frequency or phase, on a waveform of one or both of the alternating signals and to determine the polarity information based on the recognized polarity indicator. Thus, the polarity information related to the excitation signal is included in the alternating signals and therefore there is no need for a separate signaling channel for transferring the polarity information to the positioning device.

A scale capable of maintaining measurement accuracy even if the pattern of the scale pattern is scratched is provided. The scale 2 comprises a scale pattern 4 having a plurality of unit patterns provided at a predetermined pitch along the measurement direction on a surface thereof. At least one of the plurality of unit patterns comprises a plurality of loop portions 8 formed with conductors in a loop shape. The plurality of loop portions 8 included in the unit pattern are arranged so as to be spaced from each other such that the centers of gravity of the loop portions 8 are at the same position in the measurement direction on the surface of the scale 2. Thereby, the plurality of loop portions 8 included in the unit pattern can prevent deviation of the center of gravity of the magnetic flux distribution in the measurement direction, even if any of the plurality of the loop portions 8 is scratched. Therefore, the scale 2 can maintain the measurement accuracy.

An apparatus, comprising: a transmitting coil; a first receiving coil having a first receiving coil portion and a second receiving coil portion, the first receiving coil portion and the second receiving coil portion being coupled to one another, and the first receiving coil portion and the second receiving coil portion each including N lobes, where N is an integer and N≥1; a second receiving coil having a third receiving coil portion and a fourth receiving coil portion, the third receiving coil portion and the fourth receiving coil portion being coupled to one another, and the third receiving coil portion and the fourth receiving coil portion each including N lobes; wherein the first receiving coil is disposed over the second receiving coil.

The invention relates to a novel type of electric inductance arrangement for a series of applications in the field of distance measurement, sensor-based detection of objects, and construction of induction machines. The novelty consists in the type of inductance arrangement of the receiver or transmitter coil, said arrangement being designed in the form of a ladder rung arrangement, wherein the ladder spars short-circuit the rungs. The sum of all the short-circuit currents is an indicator of what is occurring in the surroundings of the arrangement. This could be changing magnetic fields caused by transmitter objects or additional ladder-rung systems acting as transmitters. Multiple such sensors and transmitters can be designed in the ladder-rung form, said sensors and transmitters being connected in parallel or in series according to the application under certain circumstances and if necessary assuming the excitation function by moving a conductor through which a direct current is flowing or by applying alternating currents. The aforementioned inductance arrangement results positively in that the coils can all have a completely crossover-free design and are therefore substantially simpler to technically implement for very different applications in electrical engineering. The applicability ranges from short-range distance measuring devices and long-range object location to light detection and efficient induction machines with large or also very small constructions.

A position detection device for detecting a position of a shaft moving forward and backward in an axial direction is provided with a detection object attached to the shaft, an excitation coil for generating an alternating magnetic field, and a detection coil arranged along an axial direction of the shaft. A magnitude of a voltage induced in the detection coil varies in accordance with a position of the detection object.

A position sensor system having at least two receiver coil sets, at least one transmitter coil and a signal conditioning and processing unit, wherein each receiver coil set of the at least two receiver coil sets includes at least two separate receiver coils including a sine receiver coil and a cosine receiver coil, wherein the signal conditioning and processing unit is contained in an integrated circuit, and wherein the at least two receiver coil sets, the at least one transmitter coil and the integrated circuit containing the signal conditioning and processing unit are located on a printed circuit board.

Examples described herein provide a method that includes storing, in a first buffer associated with a first ADC of a DSP, resolver sine values collected from first, second, and third resolvers. The method further includes storing, in a second buffer associated with a second ADC of the DSP, resolver cosine values collected from the first, second, and third resolvers. The method further includes storing, in a third buffer associated with a third ADC of the DSP, resolver excitation values collected from the first, second, and third resolvers. The method further includes determining a midpoint value of the resolver excitation values, determining a sine amplitude based at least in part on the resolver sine values and the midpoint value, and determining a cosine amplitude based at least in part on the resolver sine values and the midpoint value. The method further includes identifying a quadrant of a resolver position.

Provided is a rotation angle detection device including: a coefficient identification unit configured to identify, based on a sine signal and a cosine signal which are based on a rotation angle of a rotating body, coefficients of frequency components included in the sine signal and the cosine signal; a correction value calculation unit; and a rotation angle calculation unit. The coefficient identification unit is configured to identify, for each of integers M and N which satisfy a relationship in which M+N is equal to a positive constant, and each of which is equal to or larger than 0, a coefficient of each of (M+N−1)th order components included in the sine signal and the cosine signal, based on results of application of low-pass filters to products of an M-th power of the sine signal and an N-th power of the cosine signal.

An integrated circuit is provided for use in a sensor system having a plurality of sensing coils arranged in a star configuration coupled to terminals of an integrated circuit, such that a first and a second terminal are connected external to the integrated circuit via a loop including a first and a second sensing coil in the plurality of sensing coils. The integrated circuit includes: sensing circuitry for evaluation of sense signals received from the sensing coils via said terminals; a current source and a current sink coupled to respectively a first and a second of said terminals, such that upon supply of current from the current source a current is established through the loop external to the integrated circuit and a detection signal is generated; and an evaluator for evaluating one of more detection signals to detect failure and/or weakness within said loop.

Even using the redundant system resolver in which the magnetic interference between systems occurs, to provide an angle detection apparatus which can reduces the influence of the magnetic interference and can calculate the rotational angle with good accuracy, without performing synchronous control between systems in real time. An angle detection apparatus is provided with a resolver which has the first system windings and the second system windings in which magnetic interference occurs between systems; a first system removal processing unit that performs a second cycle component removal processing which removes component of the second cycle of the second system, to detection values of the first system winding output signals; and a first system angle calculation unit that calculates a first angle of rotor, based on the detection values of the first system winding output signals after the second cycle component removal processing.