A sensing system and a method for sensing position include a first magnetic track comprising a first number of multipoles for generating a magnetic field solidarily fixed to a second magnetic track for generating a magnetic field and a second sensor for sensing magnetic field, forming a magnetic structure. At least two sensors are included. The first sensor is positioned proximal to the first magnetic track, closer to the first magnetic track than to the second magnetic track. The second sensor is positioned proximal to the second magnetic track. The distance between the first sensor and the second magnetic track is larger than the distance between the second sensor and the second magnetic track. The magnetic flux density generated by the first and second magnetic tracks follow a ratio of two or more.

A method of correcting a position reading from a position sensing arrangement. The position sensing arrangement is suitable for sensing the position of a revolute joint of an articulated structure, and comprises a disc having a magnetic ring with magnetic pole pairs and a magnetic sensor assembly comprising a magnetic sensor array for detecting the magnetic pole pairs of the magnetic ring. The method comprises: for each pole pair of the magnetic ring, taking a calibration pole pair position reading with the magnetic sensor array, and generating a pole pair correcting function by comparing the calibration pole pair position reading with a model pole pair position reading; averaging the pole pair correcting functions of the pole pairs of the magnetic ring to generate an average pole pair correcting function for the magnetic ring; taking a position reading with the magnetic sensor array, the position reading comprising a plurality of pole pair position readings; and generating a corrected position reading by deducting the average pole pair correcting function from each pole pair position reading.

The present disclosure discloses a servo motor and an encoder calibration method. The encoder calibration method includes: calculating a gain error, an offset error and a phase error, by an error calculation block, according to a first signal and a second signal output by an encoder; calculating at least one gain calibration parameter, at least one offset calibration parameter and at least one phase calibration parameter, by the error calibration block, according to the gain error, the offset error and the phase error; and calibrating sequentially, by the encoder, the gain, the offset and the phase of the first signal and the second signal according to the at least one gain calibration parameter, the at least one offset calibration parameter and the at least one phase calibration parameter, wherein performing at least one gain calibration and offset calibration after the phase calibration is completed.

A sensor for an encoder. The sensor includes a sensing circuit, an active setting module, an inactive setting module, and a sensor interface. The sensing circuit module is configured to generate an output signal related to a sensed characteristic. The active setting module includes a first pole width setting. The first pole width setting is associated with a first pole width for the encoder. The first pole width setting is accessible by the sensing circuit module. The inactive setting module includes second pole width setting. The second pole width setting is associated with a second pole width for the encoder. The second pole width setting is not accessible by the sensing circuit module. The sensor interface is configured for retrieving the second pole width setting from the inactive setting module and writing the second pole width setting to the active setting module.

A linear encoder can have a mass embodiment having a position code marking, a read head having a calibration means, and a control and analysis unit, and calibration method for calibrating a position code made of code elements using the read head. The read head has a sensor unit having at least two detection reference points, the detection distance of which establishes at least one standard with high precision. In the scope of the calibration method, calibrated position values are prepared for code elements with the aid of the standard, which is determined with high precision, and are stored in the control and analysis unit.

A position measuring device intended for a rotary electric machine. The position measuring device includes a position sensor and a fixing arm projecting with respect to the sensor compartment, wherein the fixing arm has an orifice exhibiting a central axis. The fixing arm has at least one slot made in the periphery of the orifice, the slot exhibiting a depth, in the direction of the central axis as far as a bottom wall, greater than or equal to 2 mm, the slot being configured to receive a tooth of a calibration tool. The invention also relates to the calibration tool cooperating with the position measuring device.

The subject disclosure relates to techniques for determining a positioning error of a rotary encoder. A process of the disclosed technology can include steps of receiving measurement data including an angle and timestamp measured at each of a plurality of positions during a rotation of a rotary encoder, determining an angular velocity, at each of the plurality of positions, based on the corresponding measurement data, and determining a positioning error of the rotary encoder based on the angular velocity at each of the plurality of positions. Systems and machine-readable media are also provided.

A device for estimating the sensitivity of a position sensor for a magnetic bearing supporting a rotor, the sensor being capable of measuring the position of the rotor in relation to the magnetic bearing, the magnetic bearing including at least one shaft provided with at least two radially opposite coils. The device includes a control, a current-measuring component, a component for measuring the initial position of the rotor, a component for determining a variation in currents, a component for determining a movement of the rotor, and a component for determining the sensitivity of the sensor, configured to determine the sensitivity of the position sensor based on a movement setpoint and on the value of a movement of the rotor.

An angle sensor temperature correcting device includes: a zero correcting factor storing portion that stores, as a reference temperature bridge midpoint potential difference offset and a bridge total resistance indicating value, a difference from an actual correct value, for a relative angle between a bridge circuit and a magnetic field, for the bridge midpoint potential difference, and a value indicating the total resistance of the bridge circuit, at a reference temperature, and stores, as a zero correcting factor, a ratio of the bridge midpoint potential difference offset and the bridge total resistance indicating value at the reference temperature; and a temperature correcting portion that performs temperature correction on angle information obtained from the bridge midpoint potential difference of the bridge circuit at a given time, based on a zero correcting factor stored in the zero correcting factor storing portion.

A magnetic-field-based angle sensor system includes a stator component and a rotor component rotatable relative thereto, a magnetic field sensor operating in saturation operation and a magnetic field sensor operating in linear operation, wherein the magnetic field sensor operating in saturation operation is configured to determine a rotation angle of the rotor component relative to the stator component, and wherein the magnetic field sensor operating in linear operation is configured to ascertain an external magnetic stray field acting on the angle sensor system. The angle sensor system further includes a control device configured, based on the ascertained external magnetic stray field, to compensate for a stray-field-dependent measurement deviation in the determination of the rotation angle carried out.