A torque and angular sensor includes a differential angle sensor to precisely measure a differential angle between an input shaft and an output shaft and an angular position sensor to measure the angle of at least one of the shafts over a full angular range. The differential angle sensor measures an output rotation angle of an output target and an input rotation angle of an input target using changing voltages in taps on the input and output coils, which each carry an AC excitation current and which are each inductively coupled with teeth on targets fixed to rotate with one of the shafts. Input shaft rotation angle region is combined with the input angular position as a rotation angle composite. A raw torque angle is determined based on the difference between the input and output rotation angles. Rotational and Linear compensation provides a high-precision torque angle.

Disclosed is a valve actuator configured to determine, during operation of a valve by an alternating current (AC) motor of the valve actuator, an amount of torque produced by the AC motor. A process for measuring the amount of torque produced by the AC motor includes actuating a valve using the AC motor of the valve actuator, measuring, by a microcontroller of the valve actuator and during the actuating of the valve, a time interval between: (i) a first zero crossing of a waveform of AC voltage applied to the AC motor, and (ii) a second zero crossing of a waveform of AC current drawn by the AC motor, and determining, based on the time interval, an amount of torque produced by the AC motor during the actuating.

The invention relates to a twisting torque sensor, comprising a transmission shaft (12) subjected to the torque to be measured, a reference shaft (14), and a device for measuring an angular deformation representing the torque to be measured between the two shafts. The torque sensor is characterised in that the transmission shaft (12) comprises a bore (24) extending from one end of the transmission shaft (12), referred to as input (28) of the shaft, to an opposite end, and in that the torque sensor comprises an enclosure (22) for confining the temperature of the two shafts, and a fluid circulation circuit including a portion made up of said bore (24), an injector (32) for injecting the fluid into the bore (24) at said input (28) of the shaft, and a fluid temperature sensor (34) in the fluid circulation circuit, the measured temperature being intended for correcting the torque measurement.

First and second encoders are fixed to a drive plate and a clutch cover of which the center portions are connected to each other via a connection shaft and which are disposed between, in a transfer path for torque outputted from an engine, a damper and a connecting/disconnecting part of a clutch mechanism of a transmission. At the same time, detection units of first and second sensors are opposed to portions to be detected of the first and second encoders, respectively.

The invention relates to a device, an arrangement and a method for characterizing the torsion, rotation, and/or positioning of a shaft by generating a periodic magnetic field of a magnetic field generator disposed between at least two magnetic field detectors by applying a periodic exciter signal. The field is modified by the shaft and induces an output signal at each of the magnetic field detectors. The difference with respect to amplitude or phase between the exciter signal and the first output signal is detected as a first measured variable and between the exciter signal and the second output signal is detected as a second measured variable. The total of and/or the difference between the first and the second measured variables is calculated, and the torsion, rotation, and/or positioning of the shaft is characterized based thereon.

The system and method determines the torque applied to a rotating shaft by a load. A first sensor detects rotation of a first wheel and a second sensor detects rotation of a second wheel. A third sensor is proximate to the first sensor. A processor determines: 1) a magnitude of a phase angle (.sub.A) based on the first and second sensors and having an unknown sign; 2) a magnitude of a phase angle (.sub.B) based on the second and third sensors and having an unknown sign; and 3) a magnitude of a phase angle (.sub.C) based on the first and third sensors and having a known sign. The processor determines a sign of the phase angle (.sub.A) based on the values of the phase angles (.sub.C) and (.sub.C) and determines a torque value from the load applied to the shaft at least in part based on the magnitude and sign of the phase angle (.sub.A).

A vehicle steering apparatus. The durability of a sensor rotor to heat and abrasion is improved. The flatness of the sensor rotor is prevented from being lowered during calking for coupling of the sensor rotor to a steering shaft so that steering torque of a driver can be more accurately detected. A fabrication process is simplified, and fabrication costs are reduced.

A device and method for correcting a resolver offset of an eco-friendly vehicle is provided. The device and method are capable of correcting the resolver offset based on an angle of torsion occurring in a shaft of a motor rotor. Accordingly, the resolver offset is corrected more accurately.

A rotation transmission device having a high torque measurement resolution is provided. The rotation transmission device is provided with: a rotary-shaft unit (6) having a first and second rotary shaft (13, 14) combined so as to be coaxial and such that the end sections thereof can rotate relative to each other and a torsion bar (15) that is provided on the inner-diameter side of the first and second rotary shafts so as to be coaxial therewith, has one end section connected to the first rotary shaft (13), and has the other end section connected to the second rotary shaft (14); a first gear (7) fastened to the outer peripheral surface of the first rotary shaft (13); a second gear (8) fastened to the outer peripheral surface of the second rotary shaft (14); a coupling shaft (9) provided on the inner-diameter side of the torsion bar (15) so as to be coaxial therewith, having one end section connected to one rotary shaft (13), and having the other end section protruding from an end of the torsion bar (15) in the axial direction; a first encoder disposed and fixed on the other end of the coupling shaft (9) so as to be coaxial with the first rotary shaft (13) and having a first detected section (39); a second encoder fastened on the other end of the second rotary shaft (14) so as to be close to the first encoder and having a second detected section (40); and a sensor unit having at least one sensor (42a, 42b) that faces the first and second detected sections (39, 40).

The invention relates to a system for determining a torque applied between two rotating members. The system includes a test body with a deformable structure arranged to transmit the torque while enabling an angular displacement according to the applied torque. The system includes two encoders each on a different rotating member and each capable of emitting a periodic signal representative of the rotational displacement of the corresponding member.