Abstract: There is provided an apparatus and method for identifying and measuring the electric field strength which occurs from each of RFID tags arranged in a detection target space by a receiver to grasp the state of an object. The apparatus is provided with m (m>=1) electromagnetic field generation means provided near a space, the space being occupied by the object when the object is in a particular state; n (n>=1) electric field strength measurement means for identifying and measuring electric field strength which occurs from each of the m electromagnetic field generation means; characteristic extraction means for calculating characteristics from m×n time-series data of the electric field strength; and state identification means for identifying, by statistical processing, a state from the characteristics and characteristic data in each state for learning.

Abstract: The present invention provides a position detecting device for detecting a positional relationship between a first component (10) and a second component (12), comprising a marking arrangement (14) which is provided on the first component (10) and has an absolute track (18) and an incremental track (20), the absolute track (18) having a plurality of absolute markings (22) from which a binary absolute code sequence (B) can be read, and the incremental track (20) having a plurality of incremental markings (24) which are associated with the absolute markings (22) and from which an alternating incremental sequence (I) can be read, and a sensor arrangement (16) which is provided on the second component (12) and is configured to scan the absolute markings (22) and the incremental markings (24; 24), wherein the absolute code sequence (B) is formed from a first and a second De Bruijn sequence (B1, B2) of order N which follow one another, the second De Bruijn sequence (B2) being a cyclic shift of the first De Bruijn se

Abstract: A position sensing assembly adapted for use with a master cylinder to measure travel of a piston of the master cylinder via a magnet operatively coupled to the piston thereof for movement therewith between a zero brake apply position and a full brake apply position. According to one embodiment, the position sensing assembly includes a housing adapted to be attached to a master cylinder housing and a flux concentrator operatively disposed with the position sensing assembly housing. The flux concentrator includes a first end, an intermediate body, and a second end. At least one of the first end and the second end defines a longitudinal plane and at least a portion of the intermediate body is oriented at an angle relative to the longitudinal plane whereby the position sensing assembly is adapted to measure the travel of the piston of the master cylinder via the magnet.

Abstract: An apparatus includes a circuit, a code modulator, and an actuator. The circuit is operable to detect displacements of a rotating object while in motion. The circuit is operable to detect a position of the displacements and to generate a signal associated therewith. The code modulator is operable to generate a modulated signal based on the position and the displacements. The actuator is operable to apply a force to the rotating object, wherein the force is based on the modulated signal.

Abstract: A sensor device for a pedal which is set up to determine at least one actuating variable regarding an operation of the pedal by a user of a device which is actuable by means of the pedal, and to output information corresponding to the at least one determined actuating variable, the sensor device additionally being set up to determine as the at least one actuating variable, at least one variable regarding a position and/or a change in position of an input rod disposed on the pedal, which is able to be set into at least a rotary motion by operating the pedal, in relation to a specified spatial direction. Furthermore, a method for providing information regarding an operation of a pedal is described.

Abstract: A motor vehicle gearbox position sensor includes a magnet and a probe for measuring a magnetic field at a sensitive end. The magnet and the probe may be placed facing a moving target connected to an actuating element, which is used to select the gear ratios of a gearbox in order to determine the position of the target in space and, from this, deduce the position. The position sensor also includes at least one ferromagnetic element positioned at the periphery of the sensitive end to trap metallic contaminants. A motor vehicle gearbox includes an actuating element that selects gear ratios, a moving target connected to the actuating element, and a position sensor.

Abstract: A system and an associated method provide an ability to sense, with a magnetic field sensor, a position of a plurality of gears (and neutral) selected by a gear shift lever of a vehicle. In some embodiments, the system and method use a ferromagnetic target having features, positions of which can be sensed by the magnetic field sensor. In other embodiments, the system and method use a magnet having features and characteristics that can be sensed by the magnetic field sensor.

Abstract: A method for localizing a person in surroundings equipped with fixed electrical appliances includes measuring an electromagnetic field radiated by one or more of these fixed electrical appliances with a magnetometer carried by the person, identifying a fixed appliance operating near the magnetometer by comparing the measured field with pre-recorded magnetic signatures. Each pre-recorded magnetic signature is associated with an electrical appliance present in the surroundings. The person is then localized at least in part based on pre-recorded items of information that correspond to localization, in the surroundings, of the fixed electrical appliance as identified by its magnetic signature.

Abstract: A three-wire transformer position sensor is provided that includes an excitation coil and an output coil. The excitation coil is adapted to be electrically excited with an excitation signal, and has a first end and a second end. The output coil includes a first coil and a second coil and is inductively coupled to the excitation coil upon electrical excitation thereof the excitation coil. The first end of the first coil is electrically connected to the second end of the second coil and to the second end of the excitation coil, and the second end of the first coil is electrically connected to the first end of the second coil. The output coil is configured, when it is balanced and the excitation coil is being electrically excited, to supply a null output signal.

Abstract: A method of measuring flux density and run out to accommodate rotors of different diameters, evaluate intrinsic properties of magnet material and the magnetization process. Circular run out measurement capability is also used to evaluate bearing journal “ovality.” The method includes the use of a scan tool, or a DLA Rotor Flux Density Scan Fixture, which evaluates the electromagnetic field strength (gauss), combined with surface run out and presents the data in a scalable pictorial format. The scan tool includes a probe which measures a magnetic field strength and circular run out of the perimeter of the magnet. Simultaneously, a non-contact measurement sensor is used to measure the rotor surface for subtle variations. The resulting sine wave gauss data and the surface dimension data are manipulated into a scalable “radar” plot. The radar plot correlates magnetic pole field strength and surface circular run out variation to the index position.

Abstract: A magnetic linear position sensor includes an array of N number of magnets. The array of magnets is distributed along a line to form a magnetic field relay along the line. The sizes and positions of the magnets in the array of magnets are symmetric along the line, and the size of the magnets decreases from the sides of the array of magnets towards the center of the array of magnets. The magnetic linear position sensor further includes a magnetic field sensor spaced apart and positioned above the array of magnets. The magnetic field sensor moves back and forth over the array of magnets to sense the magnetic field of the array of magnets.

Abstract: Provided is a position detector device capable of suppressing the effect of external magnetic fields on precision in detection. A position detector device (1) comprises: a subject to be detected (4a), which rotates along with the rotation of a handle grip (3) that is disposed on a handlebar (2); a detector unit (5) that detects the subject to be detected (4a); and a case (7) which houses the subject to be detected (4a) and the detector (5). The subject to be detected (4a) is treated as a magnetic cylindrical body, the detector unit (5) is treated as a magnetic detector unit (5) that detects changes in magnetism. A support member (6) rotatably supports the subject to be detected (4a), and further comprises a housing member (65) that houses the detector unit (5) on the interior circumference side of the subject to be detected (4a).

Abstract: Magnetic tracking systems and methods for determining the position and orientation of a remote object. A magnetic tracking system includes a stationary transmitter for establishing a reference coordinate system, and at least one receiver. The remote object is attached to, mounted on, or otherwise coupled to the receiver. The transmitter can include a set of three mutually perpendicular coils having a common center point, or a set of three coplanar coils with separate centers. The receiver can include a set of three orthogonal coils. The position and orientation of the receiver and the remote object coupled thereto is determined by measuring the nine mutual inductances between the three transmitter coils and the three receiver coils. The magnetic tracking system provides reduced power consumption, increased efficiency, digital compensation for component variation, automatic self-calibration, automatic synchronization with no connections between transmitter and receiver, and rapid low-cost implementation.

Abstract: The present invention relates to a proximity sensor having a first transmission coil, a second transmission coil, at least one reception coil, an excitation device which is connected to the first and second transmission coils, and an evaluation unit which is connected to at least one transmission coil and/or to the excitation device as well as to the at least one reception coil.

Abstract: A control rod position detector including a permanent magnet that is attached on a control rod inserted in a reactor pressure vessel, where the permanent magnet is capable of moving together with the control rod, and a plurality of reed switch mechanisms that are arranged in the reactor pressure vessel at regular intervals in an insertion direction of the control rod. Each of the reed switch mechanisms is provided with a pair of reed switches that are placed so as to overlap with each other in the insertion direction of the control rod. The pair of reed switches are connected to a common wiring. The common wiring is connected to a detector that detects a position of the control rod based on signals from the reed switches.

Abstract: A movement system includes a bridge crane, a trolley, and a movement device. The movement device includes an attachment portion, a plurality of housings, first and second curved elements, a cable, and a cable angle sensor. The curved elements are pivotally attached to housings and perpendicularly overlap with one another such that a first slot defined in the first curved element is perpendicular to a second slot defined in the second curved element. The first curved element is pivotable about a first axis and the second curved element is configured to pivot about a second axis. The cable extends from the attachment portion and through each of the slots. The cable is pivotable to angularly displace at least one of the curved elements about a respective axis. The cable angle sensor is configured to measure the angular displacement of the at least one of the first and second curved elements.

Abstract: A low-cost magnetic encoder that facilitates generating sinusoidal magnetic flux is provided. First and second permanent magnet arrays each include a plurality of permanent magnets arranged such that magnetic poles having the same polarity face each other, and magnetic yokes disposed on side surfaces of the plurality of permanent magnets. The permanent magnets and the magnetic yokes are arranged side by side at a predetermined pitch in the moving direction of a magnetic piece array. First and second magnetic detectors corresponding to the first and second permanent magnet arrays are disposed in a positional relationship allowing detection of leakage magnetic flux generated when the permanent magnet arrays and the magnetic piece array are displaced with respect to each other.

Abstract: A system is configured to determine the displacement of a moveable member relative to a reference member. A set of sensors is fixed relative to one of the reference member and moveable member. An array of encoded words is provided. The encoded words define the positions of the moveable member along a first direction. Each encoded word includes a plurality of indicia and each indicia is a multi-level logic unit configured as one of at least three states.

Abstract: A system is configured to determine the displacement of a moveable member relative to a reference member. A set of sensors is fixed relative to one of the reference member and moveable member. An array of encoded words is provided. The encoded words define each position of the moveable member along a first direction. Each encoded word includes a plurality of indicia and each indicia is a multi-level logic unit configured as one of at least two states. The position of the encoded words relative to the set of sensors defines a position of the movable member along a second direction.

Abstract: In determining an exciter conductor spacing of an exciter conductor of an exciter conductor structure from a sensor element of a calibratable magnetic field sensor, first and second electric currents are impressed into the first and second exciter conductors of the exciter conductor structure to generate first and second magnetic field components in the sensor element of the magnetic field sensor, and a quantity is determined depending on the first and second magnetic field components by means of the sensor element. Further, the exciter conductor spacing of the exciter conductor from the sensor element of the magnetic field sensor is established in dependence on an exciter conductor intermediate spacing between the first exciter conductor and the spaced-apart second exciter conductor and the quantities depending on the first and second magnetic field components.

Abstract: This method for determining a person's activity in surroundings equipped with electrical appliances that are switchable, in response to a command from the person, between an ‘on’ mode and an ‘off’ mode, wherein the method comprises: the measuring of the magnetic field produced by one of the electrical appliances by means of a magnetometer carried by the person, the identifying of the electrical appliance in ‘on’ mode in proximity to the magnetometer by comparing the measured magnetic field with the pre-recorded magnetic signatures of these electrical appliances in ‘on’ mode, and the determining of the activity of the person on the basis of a pre-recorded activity identifier associated with the electrical appliance identified as being in ‘on’ mode on the basis of its magnetic signature.

Abstract: In order to be able to measure over more than 360° with a magnetic angle sensor, it is proposed not to adjust the distance between the encoder magnet and the sensor element in addition to the rotation, e.g. by means of a thread, like in the prior art, but to maintain said distance constant, but instead to adjust a magnetic variator with respect to its axial distance from the sensor element, or also in transversal direction, which variator can be a flux conductor or also a secondary magnet.

Abstract: A pipeline pig signal made according to this invention houses one or more shielded magnetometer sensors and a microcontroller with adaptive thresholding detection means for reducing the likelihood of false alarms. The adaptive thresholding detection means removes outlier data from the magnetic flux data stream and then passes the outlier-free data stream through four low pass filters. A smoothed magnitude of the data stream is compared to detection limits and, if a passage event has occurred, a recent detection is indicated, a counter of a display unit is incremented, a time of passage is recorded, and both statistics are displayed on the display unit. Because a single object may produce multiple magnetic fields, the detector may be locked-out for a predetermined period of time after the passage event to prevent a second detection of the same object as it passes the detection device.

Abstract: Several systems and methods for monitoring the proximity of a device to a power line are disclosed. Electric field monitoring systems are mounted to the device and include a plurality of electric field sensors and a monitoring system base unit. Each electric field monitoring sensor senses the strength of a magnetic field in which the sensor is positioned and transmits a corresponding magnitude output signal to the base unit when polled by the base unit. If a sensor reports a magnetic field exceeding a threshold, the frequency of polling for that sensor may be increased. If a sensor reports a magnetic field exceeding another (possibly identical) threshold, an alarm may be activated, movement of the device may be limited or stopped or another action or a combination of actions may be taken.

Abstract: A measuring arrangement for the measurement of the position and/or movement of a rotor of an electricmachine, an electric drive including the measuring arrangement, and an elevator system including the electric drive are provided. The measuring arrangement includes a magnetic band whose magnetic property is so implemented that it varies in the longitudinal direction of the band.

Abstract: Methods and devices to determine a mobile device housing position are described. An example device disclosed herein includes a housing having a first portion movably coupled to a second portion, the second portion to have a first position, a second position, and at least one intermediate position relative to the first portion, wherein the intermediate position is between the first and second positions; a position detector in the first portion, the position detector to measure a transitional magnetic field when the second portion is in the intermediate position and to measure a second magnetic field; and a processor to determine that the second portion is in the first position or the second position based on the transitional magnetic field and the second magnetic field.

Abstract: A magnetic detection device includes a signal processing circuit that detects a moving position and a moving direction of a magnetic mobile object using an output of a comparing circuit configured to output a signal by comparing an output signal of a magneto-electric transducer element with a threshold. A duration during which an output of the signal processing circuit is in a high level or in a low level is fixed to a period t1 or a period t2 depending on the moving direction of the magnetic mobile object. When switching of the moving direction of the magnetic mobile object takes place within the period t1 or the period t2, the signal processing circuit outputs a position signal same as a position signal indicating a position immediately before the switching of the moving direction of the magnetic mobile object due to hysteresis of the threshold of the comparing circuit.

Abstract: An electromechanical transducer device for a vehicle transmission or drive has a lever (1) that can be pivotally actuated about at least one first axis (2a, 2b) and which is mechanically decoupled from the transmission or drive. The lever is supported by a suspension (3) on the first axis (2a, 2b). The axis (2a, 2b) comprises at least one first component (6a, 6b) of a magnetic rotational angle sensor system (6a, 6b, 7a, 7b) at an axial end section to detect angular position or rotational movement of the lever (1). A second component (7a, 7b) of the rotational angle sensor system is arranged on the suspension (3) opposite of the end section of the axis (2a, 2b), wherein the axial end section is located within the suspension (3). A circuit board (15) accommodating the rotational angle sensors (7a, 7b) is arranged on the suspension (3), and the circuit board (15) comprises at least one flange-like extension (17, 18) protruding from the circuit board plane.

Abstract: A system for use with an implantable flow control device having an adjustable valve and a magnetic device coupled to the valve, the system including a locator tool and an electronic magnetic-based indicator tool. The locator tool includes a processing system and an electronic display. The indicator tool is configured to couple with the locator tool. The indicator tool includes an electronic compass module configured to detect and generate a first set of data based on an orientation of magnetic fields associated with the magnetic device as an indication of the setting of the valve and measure and generate a second set of data based on ambient background magnetic fields. The indicator tool electrically communicates the data to the locator tool. The processing system receives and uses the first and second sets of data generated from the electronic compass module to determine orientation of the magnetic device.

Abstract: An apparatus for detecting a storm, including a partially transparent housing defining a cavity and a suspended magnetic element positioned within the cavity. The magnetic element is rotatable in a first plane and pivotable in second plane and third planes, wherein the second plane is perpendicular to the first plane and the third plane is perpendicular to the first plane and perpendicular to the second plane. A rapid pivot of the magnetic element away from the pull of gravity signals a close proximity of a storm. A first sensor operationally connected to the magnetic element for measuring the deflection of the magnetic element, dampening fluid substantially fills the cavity, a second sensor positioned within the housing for measuring the degree to which the magnetic element is level, and a laser operationally connected to the magnetic element and positioned to emit a beam of light corresponding to the orientation of the magnetic element.

Abstract: A linear position measuring system (10) and a method for determining a position of a carriage in relation to a slide rail (12), with an incremental scale (14) placed along the slide rail (12) and a scanner secured to the slide scale. The scanner is designed to scan a plurality of incremental markings along the incremental scale (14), wherein the incremental markings can be scanned as an essentially analog signal progression. The scanner is designed to scan the incremental markings with a variable scanning frequency. The scanning frequency can be adaptively varied in relation to a currently acquired frequency of the analog signal progression, wherein the variable scanning frequency measures at least twice the currently acquired frequency of the analog signal progression.

Abstract: A position detection apparatus includes a position detection target member, a magnet that moves in accordance with movement of the position detection target member, and a plurality of magnetic detectors provided on a surface opposite a movement plane of the magnet. A flat yoke is provided on the reverse face of the magnet. The magnetic polarity of a peripheral side part of the magnet is opposite to the magnetic polarity of a center part thereof. The peripheral side part is formed at a regional range that can be defined on the basis of a predetermined distance(s) measured from a side edge of the yoke.

Abstract: A device for determining the rotational speed of a transmission shaft (12). The device includes a rotational speed indicator (3) connected, in a rotationally fixed manner, to the transmission shaft (12) and at least one rotation speed sensor (2) including at least one sensor element (10). By way of the sensor element (10), the speed of the transmission shaft (12) is detected via the speed indicator (3). The speed sensor (2) is attached to a shifting element (5) for actuating a sliding sleeve (4) of a clutch device (1) that is connected to the transmission shaft (12) in such a manner that the sliding sleeve (4) axially movable on but fixed so as not to rotate.

Abstract: A magnetic field sensor includes a sensing structure having a ring-shaped well, a plurality of contacts of equal size disposed along the ring-shaped well, a circuit having a plurality of electronic switches associated with the contacts of the sensing structure, a logic block for controlling the electronic switches, at least one current source, a voltage measuring device, a timing circuit providing a control signal for controlling the logic and providing a reference signal, wherein the logic block is configured to switch the switches under the control of the control signal so that a predetermined number of contacts of the plurality of contacts form a vertical Hall element supplied with current from the at least one current source and having two contacts connected to the voltage measuring device and circuitry configured to measure a phase shift between the reference signal and an output signal of the voltage measuring device.

Abstract: An embodiment of a method for a determination, section after section, of a parameter-dependent correction value approximation course includes determining a first measurement signal value with a first parameter value associated with a sensor arrangement when the first parameter value fullfils a predetermined condition or a trigger condition is fulfilled, changing the first parameter value to obtain a second parameter value, determining a second signal value with the second parameter value and determining a second partial section of the correction value approximation course for a second parameter range based on a functional connection describing the second partial section, the first parameter value, the second parameter value, the first measurement signal value, the second measurement signal value and an initial correction value.

Abstract: A sensing device for remotely determining the position of the needles of a gas meter including directional magnetic field emitters each having a north and a south pole and being secured relative to respective needles such that the pole axes are generally centered over the needle axes. The emitters producing directional magnetic fields that follows the position of the needles as they rotate and the sensing device further including position sensors positioned over the emitters that read the orientation of the magnetic fields sending this information to a processor for calculating the needle positions.

Abstract: A wing flap sensor unit (2) having a position sensor (18) for detection of a rotation position of a shaft for operation of wing flaps and having a housing (4) which surrounds the position sensor (18), having an attachment component (20, 22) for attachment in an aircraft wing and having a connecting point (24) for an electrical connector of the position sensor (18). Hereby, the housing (4) is at least partially manufactured from titanium using a precision-casting method. The titanium precision-casting method makes it possible to achieve a particularly robust and lightweight housing.

Abstract: An angle detecting apparatus includes a rotor fixed to a rotating shaft, a pair of magnetic sensors arranged close to the outer periphery of the rotor so as to have a difference in angle (?/2) with respect to the center of rotation of the rotor, a differential operational circuit performing differential operation on detection signals output by the magnetic sensors to output a differential signal, and the angle calculating circuit calculating the angle of rotation of the rotating shaft based on the differential signal. The planar shape of the rotor is such that the sum of the distances between the center of rotation and the respective two points where two straight lines crossing at the center of rotation at a crossing angle of (?/2) cross the outer periphery of the rotor is constant, and the planar shape is symmetric with respect to a straight line passing through the center of rotation.

Abstract: For identifying the machine type of an alternating current machine, a direct current is first applied to the stator for aligning the d-axis of the rotor and the magnetic field direction of the stator. Secondly, a direct current is applied to the stator at a current angle which causes the rotors of a permanent magnet machine and a synchronous reluctance machine to exert torque in different directions. The torque direction of the rotor is detected and the machine type is identified based on the torque direction information. The machine type is recognized as a permanent magnet machine or a synchronous reluctance machine depending on the torque direction. If no torque is detected, then the machine type is recognized as an induction machine.

Abstract: Exemplary embodiments are directed to estimating a rotor angle of a synchronous reluctance motor. The motor has a stator and a rotor. A stator flux and a stator current are determined. Two orthogonal stator flux components in a stator reference frame are calculated from the stator flux. Two orthogonal stator current components in the stator reference frame are calculated from the stator current. Two rotor orientation vectors are then calculated using a known rotor direct and quadrature axis inductance components, the stator flux components, and the stator current components. A rotor angle is estimated based on the rotor orientation vectors.

Abstract: In order to provide a highly reliable inspection device that prevents a loss in reliability of inspection that uses information from a position detector as a result of the influence of magnetic bodies or the like that are present in the environment, the inspection device is characterized by being provided with biological information measurement units (10, 12) that measure biological information of an inspected target and form an image containing said biological information, a magnetic position detector (50) that detects the position of at least one of the aforementioned biological information measurement units and the inspection target, and a control unit (14) that controls the aforementioned biological information measurement units and the aforementioned magnetic position detector (50); and is further characterized by the aforementioned control unit (14) being provided with an environmental magnetic field measurement unit (301) that uses the output of the aforementioned magnetic position detector (50) to mea

Abstract: The displacement sensor (100) includes a rod (103) including a conical convex graduated magnetically anomalous region (105) and a magnetic sensor (110) located in close proximity to the concical convex graduated magnetically anomalous region (105). The magnetic sensor (110) generates a positional signal that is related to the position of the concical convex graduated magnetically anomalous region (105) in relation to the magnetic sensor (110).

Abstract: A rotation angle sensor providing excellent output characteristics is provided. The rotation angle sensor has a structure in which a ring-shaped permanent magnet provided so as to be rotatable integrally with a rotor connected to a member to be detected; magnetic flux gathering yokes surrounding the outer circumferential surface of the ring-shaped permanent magnet with a certain clearance being formed between the outer circumferential surface and the magnetic flux gathering yokes; and Hall ICs 30 arranged in gaps between the magnetic flux gathering yokes, are arranged inside a casing formed by a casing body and a cover. In the casing body, a guide tube surrounding the outer circumferential surface of the ring-shaped permanent magnet is formed with a certain clearance being formed between the outer circumferential surface and the guide tube.

Abstract: A compact sensing device capable of sensing a rotational angle and a rotational velocity, or a rectilinear moving distance and a moving velocity. A displacement sensing device that senses a rotational angle of a moving member rotation and a distance of a linear movement of the moving member, or senses an angular velocity of the moving member rotation and a velocity of a linear movement of the moving member, includes: a first movable member, moved together with the moving member by a linear movement of the moving member; a second movable member holding the first movable member in a rotatable manner, and rotated together with the moving member by rotation of the moving member; a first sensor outputting a signal in accordance with a linear movement of the first movable member; and a second sensor outputting a signal in accordance with a rotation of the second movable member.

Abstract: A rotation sensor equipped bearing capable of detecting a highly precise absolute angle with no correction work required after incorporation into a bearing installed equipment. An absolute angle sensor equipped bearing assembly includes a sensor equipped bearing and a correction data storing device. The sensor equipped bearing has a rotation detector capable of providing, as a detection output indicative of the rotation angle of a rotating raceway ring relative to a stationary raceway ring, two analog outputs that are offset 90° in phase relative to each other in terms of electrical degree. The correction data storing device stores a correction data for correcting an error when the absolute angle of the rotation angle of the rotating raceway ring is calculated from the two analog outputs and which is paired with the sensor equipped bearing.

Abstract: Disclosed is an angle sensor, which is capable of accurately measuring an angle of a steering shaft by selecting an optimum gear ratio between main and subsidiary gears constituting the angle sensor, measures a rotation amount of a vehicle steering shaft, and includes a ring-shaped main gear rotating along with the steering shaft, a first subsidiary gear rotated by rotation of the main gear and having a magnet coupled to a surface thereof, and a magnetic device detecting a change in magnetic field of the magnet and outputting data on a rotation amount, so that the first subsidiary gear rotates four times while the main gear rotates once, and a value of a scale factor is minimized during a process of acquiring valid data for measuring the angle of the main gear and thereby an error of a measured value is minimized.

Abstract: In a method for determining a parameter set describing electric parameters of a route section of a magnetic suspension railway, the route section contains a stator section forming a drive section of the magnetic suspension railway and a route cable connecting the stator section to an associated converter device. In the method, the current and voltage values are measured at the electric connecting point between the route cable and the converter device. The parameters of the parameter set are determined using the measurement values, thus forming the parameter set. Accordingly, the current and voltage values are additionally measured at the electrical connecting point between the route cable and the stator section and the current values at the neutral point side of the stator section, if the stator section is electrically connected to the route cable. The additional measurement values are also considered when determining the parameters.

Abstract: An output signal V1=sin ? is output from a first magnetic sensor and an output signal V2=cos(?+?) is output from a second magnetic sensor. An output signal correction unit in a rotation angle computing device corrects the output signal V2 from the second magnetic sensor to an output signal V2? (=cos ?) so that a positional phase difference (90°+?) between the magnetic sensors and is made equal to a target phase difference of 90°. A rotation angle computing unit computes the rotation angle ? of a rotor based on the corrected signal V2? (=cos ?) and the other output signal V1(=sin ?).

Abstract: A unit of absolute rotary position encoding, where the angular range of encoding is matched to the number of poles of an electrical motor it is intended that the encoder is to be attached to. The electrical motor is suitably a brushless DC motor. This provides unique rotational position values only through an angle corresponding to an angle between two consecutive poles to enable control/drive electronics to accurately and smoothly turn the rotor from standstill and at low speeds with varying loads applied to the motor.

Abstract: A wheel support bearing assembly for supporting a wheel, which assembly includes an outer member having rolling surfaces and serving as a stationary member; an inner member having rolling surfaces; a plurality of rows of rolling elements interposed between the respective rolling surfaces; a magnetic encoder fitted to the outer peripheral surface of the inner member at a location adjacent one end thereof; an annular sensor holder made of resin and fitted to the outer member through a core metal, the annular sensor holder having a built-in magnetic sensor with an axial gap intervening between it and the magnetic encoder; and a sealing unit arranged on an outer side axially outwardly of the encoder and the sensor for sealing a space between the sensor holder and the inner member. The magnetic encoder includes a plastic magnetic encoder having a plastic magnet defining a to-be-detected portion.