A positioning device (101) for producing a position signal indicative of a rotational position of a resolver is presented. The positioning device comprises 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 monitoring control device for diagnosing a presence/absence of a detection failure of a rotation state of a rotator includes: a rotation sensor that detects the rotation state of the rotator and outputs an analog signal in response to the detected rotation state; a converter that calculates a first absolute angle of the rotator at a first timing based on the analog signal and outputs a signal including the first absolute angle; a first control device 10 that obtains the first absolute angle; and a second control device 20 that calculates a second absolute angle of the rotator at a second timing different from the first timing based on the analog signal. The first control device 10 generates a first diagnostic signal based on the first absolute angle, and outputs the first diagnostic signal to the second control device. The second control device generates a second diagnostic signal based on the second absolute angle, and compares the first diagnostic signal with the second diagnostic signal to diagnose the presence/absence of the detection failure of the rotation state.

A control apparatus includes, for at least two-phase signals detected from a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifter that shifts a phase of a first phase signal of the resolver with a pole at a frequency f1 lower than the carrier frequency fc, a second phase shifter that shifts a phase of a second phase signal of the resolver with a pole at a frequency f2 higher than the carrier frequency fc, a signal generator that generates a correction signal for canceling out an error component of the carrier signal, and a synthesizer that synthesizes the phase-shifted first phase signal, the phase-shifted second signal, and the correction signal for canceling out the error component, in order to create a phase-modulated signal that is the carrier signal being modulated at a rotation angle of a rotor of the resolver.

An inductive position sensor utilized with a rotating or linearly displacing electrically conductive component. In a first embodiment, a sensor housing is mounted to an exterior of a structure supporting the component and exhibits a radially inwardly extending printed circuit board (PCB) with sensor coils arrayed in spatial and non-contacting position relative to a cross sectional cam end surface profile of the rotating component, such that rotation of the cam surface profile causes a linear displacement of the conducting coupler along the coils to determine a positional change of the rotating component. A further embodiment reconfigures the PCB in a linear direction within the sensor housing relative to the proximately located and linearly displaceable component and in which the sensor determines a lateral shifting of the component apart from its rotation.

A diagnostic device capable of accurately diagnosing the soundness of a resolver circuit is provided. A shifter receives excitation signal and excitation signal; shifts the level of excitation signal, excitation signal, or both; and performs level shifting such that a period of time that starts with one of two times in which, in the vicinity of the peak value of excitation signal, excitation signal and excitation signal are at the same value and ends with the other of the two times is less than a prescribed threshold. A trigger generation circuit generates a trigger during said period of time. A control unit determines whether there is an abnormality in the resolver circuit on the basis of the trigger.

An inductive position detector with a first and second body, at least one of said bodies being displaceable relative to the other along a measurement path wherein said first body comprises one or more antenna windings forming a first arrangement of windings and said second body comprises a passive resonant circuit incorporating one or more target windings in series with a capacitor; said circuit covering at least in part said first arrangement; characterized in that said first body comprises an additional winding arrangement disposed along at least part of said measurement path; said additional winding arrangement being spaced from said first arrangement of windings; and said second body comprises an additional winding arrangement covering at least in part said additional winding arrangement of said first body.

A position signal generator for an electronic position measuring device is disclosed. In an embodiment, the position signal generator includes a signal generation device for generating a periodic magnetic signal, and an electric power supply device for supplying the signal generation device with electric energy. The position of the position signal generator is determined via the position measuring device.

A position sensor assembly comprising (15) a housing (16) having a least one inner cavity, a stator (22) disposed within the housing, a moving element (23) disposed within the housing and configured and arranged to move relative to the stator (22), the stator comprising primary windings (24) and secondary windings (25, 26), the secondary windings configured and arranged to provide an output signal (27) as a function of movement of the moving element (23) relative to the stator (22), electronics (28) disposed in the housing and communicating with the primary windings (24) and the secondary windings (25, 26), the electronics comprising an integrated circuit (29) configured and arranged to provide excitation of the primary windings (24) and to demodulate the output signal (27) of the secondary windings (25, 26), and an input element (35) extending through the housing (16) and connected to the moving element (23).

To provide a correction method of resolver correction device and resolver correction device that can reduce rotation angle (the rotation speed) detection error caused by resolver. An excitation signal supply circuit supplies an excitation signal of an excitation frequency to the resolver during a normal operation, for supplying the excitation signals of a plurality of frequencies including the excitation frequency to the first phase shifter or the second phase shifter during a calibration operation. A shift amount searching circuit searches the first shift amount setting value for each frequency of the excitation signal such that the first shift amount becomes 45 degrees, and the second shift amount setting value for each frequency of the excitation signal such that the second shift amount becomes 135 degrees, while referring to the detection result of the phase difference detection circuit during the calibration operation, and stores in the correction table.

A speed sensor for detecting a speed of a magnetizable object. The speed sensor (100) can be supplied with an electric alternating signal with a first frequency by an electric signal source. The speed sensor including: a primary coil for generating a magnetic alternating field with the first frequency; first and second secondary coils. The first and second secondary coils can each be magnetically coupled to the primary coil via a magnetizable object. First and second electric signals induced in the first and second secondary coils respectively by the generated magnetic alternating field; a Goertzel filter bank detects first and second amplitude values of respective spectral components of the induced first and second electric signals in the event of a second frequency which differs from the first frequency. A processor determines the speed of the magnetizable object depending on the detected first amplitude value and the detected second amplitude value.