Abstract: A motion sensor has a magnetic field sensing element for generating a magnetic field signal and a state processor to identify a plurality of states corresponding to ranges of signal values of the magnetic field signal. The state processor includes a state peak logic module configured to generate states that have a reduced amount of state chatter.

Abstract: A rotation detector includes a first distance sensor disposed to face a rotating body with a gear portion formed non-parallel to a rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, a second distance sensor disposed at a position different from the first distance sensor in a direction of the rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, and an axis shift detecting portion for detecting an axis shift of the rotation axis based on a variation in the distance measured by at least one of the first and second distance sensors.

Abstract: A magnetic sensing apparatus and method that determines the speed and direction of gears or slotted targets. A magnet can be placed proximate to the slotted target to create a magnetic field. An integrated circuit is formed on a substrate containing two or more magnetoresistive sensors occupying the same area. This integrated circuit is biased from the magnet which is placed in close proximity. The magnetoresistive sensors are intertwined with the first magnetoresistive sensor, offset from the second magnetoresistive sensor. The magnetoresistive sensors produce phase shifted output signals representing magnetic flux flowing through the magnetoresistive sensors such that the magnetoresistive sensors are reactive to gap and angular changes in the circular track of the ferrous target. The phase shift of the signals needed to determine direction is sufficiently maintained for a variety of target feature sizes and spacing.

Abstract: A directional speed sensor comprises first and second Hall-effect modules. The first Hall-effect module outputs a first current pulse for a first predetermined period when a tooth of a toothed wheel that rotates with a shaft of the vehicle passes the first Hall-effect module in a first rotation direction and outputs the first current pulse for a second predetermined period when the tooth passes the first Hall-effect module in a second rotational direction. The second Hall-effect module is electrically connected in parallel with the first Hall-effect module, is angularly offset from the first Hall-effect module with respect to a center of the shaft, outputs a second current pulse for the first predetermined period when the tooth of the toothed wheel passes the second-Hall-effect module in the first direction, and outputs the second pulse for the second predetermined period when the tooth passes the second Hall-effect module in the second direction.

Abstract: A derailleur cable detecting assembly for an electric-auxiliary bicycle has a body and a detecting device. The body is mounted on a frame of the electric-auxiliary bicycle, is connected to a derailleur cable and has a casing and a cover. The casing has a chamber and a through hole. The cover is detachably mounted on the casing to mount a cable wire of the derailleur cable in the body. The detecting device is mounted in the body, is connected to the derailleur cable and has a circuit board and a magnetic element. The circuit board is mounted in the chamber of the casing, faces the cable wire and has an electric wire and multiple magnetic sensors. The magnetic sensors are mounted on the circuit board at intervals. The magnetic element is mounted on the cable wire between the casing and the cover, facing the magnetic sensors of the circuit board.

Abstract: A rotation sensor equipped wheel support bearing assembly detects rotational speed and rotational direction, in which a high resolution rotation signal is utilized in various vehicle controls with a suppressed size. The bearing assembly includes a plurality of rows of rolling elements between rolling surfaces in outer and inner members. A magnetic field generating element having anisotropy about a bearing center axis is provided in the outer member in alignment with the axis. The inner member is provided with a sensor for sensing the magnetic field of the magnetic field generating element oriented axially. The sensor detects the angle of rotation of the magnetic field generating element and is in the form of magnetic sensor arrays or elements for detecting the orientation of the magnetic field with a two-dimensional vector sensor to detect rotation of the magnetic field generating element.

Abstract: In a rotation sensor unit, a lid 6 is pressed against a housing 2 to push an outer race 11 of a rolling bearing 1, thereby applying a preload to the bearing 1 and increasing the rigidity of the bearing 1, so as to prevent run-out of a shaft 3. An encoder 42 is supported on this shaft 3, and a magnetic sensor element 41 is supported on the lid 6, which is pressed against the housing 2. Thus, it is possible to prevent displacement of the magnetic sensor element 41 and the encoder 42 relative to each other. The shaft 3, lid 6 and outer race 11, etc. are made of a soft magnetic material to define a magnetically shielded space between one axial end surface of the shaft 3 and the lid 6, with the magnetic sensor element 41 mounted in the magnetically shielded space.

Abstract: The invention concerns a current detection apparatus for detection of a current flowing through a conductor (1) by detection of a magnetic field surrounding the conductor. The current detection apparatus includes at least one sensor element (3) provided on a carrier portion (4) for detection of the magnetic field, and a predetermined region (S) of the conductor (1), at which the at least one sensor element is arranged. The conductor (1) in the predetermined region (S) has a plurality of conductor portions (11, 12; La, Lb) which have the current to be measured flowing therethrough in the same direction and which are spaced from each other by a predetermined spacing and which form an intermediate space (2). The carrier portion (4) is fitted into the intermediate space in such a way that the at least one sensor element (3) is arranged outside the intermediate space in adjacent relationship therewith in the magnetic field of the conductor (1).

Abstract: A measurement of a lower and a higher speed of rotation is taking place via the inductive sensor. A sensor unit, which comprises a pulse generator, a transmitter side and a receiver side, is used for determining the speed of rotation, whereby the transmitter side comprises a transmitter inductor connected with an oscillator, and the receiver side comprises two receiving inductors. The signal, which is generated by the two receiver inductors and transmitted along each of the signal paths, is forwarded to two signal processing units. Through each of the two signal paths, for lower and higher speed of rotation, the processed signal is forwarded to a logic device.

Abstract: The magnetic encoder (17) includes a slinger (18) fixed to a rotation-side raceway ring of a bearing and including an outer side surface (22) opposed to the side of a sensor to detect rotation speed of the rotation-side raceway ring and having a surface roughness Ra: 0.3 to 3.0 ?m, and an inner side surface (23) opposed to the side of a sealing member (16) to seal the bearing; a multipolar magnet (19) bonded to the outer side surface (22) through an adhesive; and a film (25b) formed on the inner side surface (23), having a surface roughness Ra of 0.3 ?m or less, and being in sliding contact with the sealing member (16).

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: A system including an encoder, multiple sensing elements and control logic. The encoder has a pole pitch and is configured to rotate in a direction of rotation. The multiple sensing elements are situated along the direction of rotation and span at least half the length of the pole pitch. The control logic is configured to receive signals from the multiple sensing elements based on the encoder in a static position and obtain a switching point based on the signals.

Abstract: The invention provides a transformer probe for sensing movement of a body of magnetic material, having multiple output channels wherein the output in each output channel is substantially unaffected by faults in other output channels.

Abstract: A device for inductive speed detection includes two planar coils which are arranged offset at a given distance from a pulse wheel and in the rotational direction of the pulse wheel, and are each part of an oscillator, the oscillator frequency of which is evaluated.

Abstract: A rotational direction detector is specified which is provided for mounting to a circumferential segment of a wheel having at least one sensor, wherein a change in the output signal of the sensor occurs when the circumferential segment enters and/or leaves the wheel contact area. Furthermore a method is specified for determining the direction of rotation of a wheel, wherein the signal change is determined and a rotational direction signal is derived therefrom.

Abstract: A speed sensor assembly includes a bearing having a first race, a second race, a plurality of ball bearings separating the first race from the second race, and a tone wheel coupled to the second race. The speed sensor assembly also includes a spacer abutting the first race and a sensor positioned adjacent the tone wheel.

Abstract: The present invention is directed to a sensor with a body and a magnetic field sensor. The body includes a plurality of structures arranged in a first direction to effect a periodically varying magnetic field upon movement of the body in the first direction. The magnetic field sensor is configured to detect components of the magnetic field in a second direction and in a third direction, wherein the magnetic field sensor is arranged adjacent to the body such that the second direction is perpendicular to the first direction and such that the third direction is perpendicular to the first direction and to the second direction.

Abstract: An integrated brushless DC motor and controller including a brushless DC motor having a rotating shaft with a 2 pole permanent magnet affixed to the shaft for rotation thereby in a plane orthogonal to the axis of rotation of the shaft. An X-Y Hall Effect Sensor is carried by a controller mounted on a circuit board attached to the motor and the Hall Effect Sensor is positioned proximate the magnet with the Hall Effect Sensor producing the Sine and Cosine components of the magnetic field as the magnet is rotated by the motor shaft. The electronic controller includes software for determining the motor angle and commutation logic from the Sine and Cosine components generated by the Hall Effect Sensor response to the rotating magnetic field.

Abstract: A method of forming a pole wheel connected to a wheel hub of a motor vehicle and a corresponding apparatus are described. A magnetically permeable, prefabricated pole wheel is placed in a mold for forming the wheel hub, and the mold is filled with a melt composed of a magnetically impermeable material in the solidified state. The melt fills the apertures formed between adjacent teeth of the pole wheel, while a shape of the pole wheel is substantially maintained.

Abstract: In a magnetic sensor 7, a tubular duct 9a for output cables 12 is formed integrally with a sensor housing 9, provided with an opening 14 having a uniform width from a proximal end to a distal end of the duct 9a on a side face thereof. The output cables 12 are mounted through the duct 9a from this opening 14, and then a slidable lid 15 is mounted to close the opening 14. Thus damage to the output cables 12 connected to the magnetic sensor 7 is prevented and, at the same time, drawing the output cables 12 outside the sensor housing 9 is made easier.

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.

Abstract: Magnetically encoded shafts for use in detecting forces exerted on the shaft during operation. Magnetically encoded regions, arranged in tracks or bands, encircle the shaft and are formed within or affixed to the shaft. The magnetically encoded regions define force-sensitive regions therebetween. Magnetic fields surround the force-sensitive regions and are altered by force vectors passing through the force sensitive region. These magnetic fields are sensed by magnetic field sensors to determine various shaft parameters including, for example: shaft rotational speed, shaft rotational position, and forces exerted on the shaft, e.g., torque, bending forces, stress forces and strain forces. To provide continuous detection of shaft operational parameters and forces, dead zones between magnetically encoded regions are aligned with force sensitive regions associated with magnetically encoded regions in other bands.

Abstract: An angular position sensor and method that relies on a stationary circular array of Hall sensors and a rotatable circular array of magnets arranged about a common axis. A periodic and simultaneous reading of all of the Hall sensor outputs is used to determine angular velocity.

Abstract: An apparatus is used for determining at least one parameter relating to an elongate member disposed within a vessel. The apparatus includes at least one measurement unit having a light emitting component and a corresponding light receiving component. The light receiving component is positioned apart from the light emitting component such that the elongate member is positionable between the light emitting component and the light receiving component. Additionally, the light emitting component is adapted to emit light towards the light receiving component, and the light receiving component is adapted to generate a signal corresponding to the light received from the light emitting component. A method for determining at least one parameter relating to the elongate member disposed within the vessel is also provided.

Abstract: Disclosed is an arrangement for detecting rotational speed of a wheel or any other rotating body by a sensor (1, 6), which is coupled via a magnetic field to an encoder (23) that rotates with the rotating body. If a slot between sensor element (S1, S2) and encoder (23) becomes too small in the prior art arrangements, flipping and, hence, doubling of the measured rotational speed of the wheel can occur. This caused problems in safety devices of a vehicle, which require a correct indication of the wheel rotational speed for proper operation. To improve the tolerance with respect to the mounting position of the known arrangements, two separated signal paths (S1, f1; S2, f2) are provided with sensor elements (S1, S2) of differing sensitivity.

Abstract: A pulse generator wheel has a cylindrical wall provided with windows distributed about a circumference of the cylindrical wall and closed axially at a first end by a ring. The ring is made of circumferentially extending profiled sections of profiled parts that are separated from one another. The pulse generator wheel is made by stamping in a round sheet metal about the circumference profiled parts each having at least one profiled section extending in the circumferential direction for forming windows between the profiled parts. The profiled sections are spaced from one another in the circumferential direction. The profiled parts are erected and the profiled sections then form a circumferential ring delimiting the windows axially.

Abstract: An electrical connector between an induction sensor and a cable for transmitting a signal provided by the sensor, including a current transformer with a primary coil and a mechanism for electrically coupling to the sensor, and a secondary coil with a mechanism for electrically coupling to the cable, the primary and secondary coils being attached together by a removable attachment mechanism.

Abstract: An apparatus for self-adjustment of, and a method for disposing, a pulse-type rotation speed transducer in relation to a rotor are described. The pulse-type rotation speed transducer has a cylindrical sensor head and an adapter to a measurement and power supply cable. An elastic clamping sleeve that radially encompasses the cylindrical sensor head is disposed in frictionally engaged fashion in a bore of a holder, the clamping sleeve forming a press fit for the sensor head in the bore. The press fit enables a rotation and an axial displacement between the holder and sensor head. The pulse-type rotation speed transducer has an active, orientation-dependent, cylindrical sensor head, and the clamping sleeve or the pulse-type rotation speed transducer has a twist prevention system in relation to the holder.

Abstract: A 2-wire, loop-powered shaft rotational speed sensor device that outputs a 4-20 mA current in response to the shaft rotational speed. The device is comprised of a sensor (e.g., magnetic, optical) that senses an output from a sensor disk (e.g., magnetic, optical) and outputs a series of voltage pulses whose frequency varies with the shaft rotational speed. A microcontroller measures this pulse frequency and generates a digital code representative of that frequency. A digital-to-analog converter generates an analog waveform in response to the digital code. A loop-powered, voltage-to-current circuit generates the output current in response to the analog waveform.

Abstract: A speed sensor assembly comprises: a driveshaft with a driveshaft axis, a sensing portion of the driveshaft having an axial bore along the driveshaft axis and multiple axial slots radially spaced around the sensing portion that penetrate through the driveshaft into the axial bore; and at least one electromagnetic sensor with a magnetic circuit proximate the sensing portion of the driveshaft; wherein rotation of the driveshaft causes the slots in the sensing portion to sequentially pass through the magnetic circuit of the electromagnetic sensor, thereby causing a change in the reluctance of its magnetic circuit that induces the electromagnetic sensor to generate an output signal that is representative of the rotational speed of the driveshaft.

Abstract: A circular top surface of a magnet is magnetized to the N-pole, and a back surface thereof is magnetized to the S-pole. A detector moves within the X-Y plane at positions located away from the top surface of the magnet. A pair of X-direction detecting elements and a pair of the Y-direction detecting elements are provided in the detector. In the X-direction detecting elements, the directions of a bias magnetic field provided to free magnetic layers are opposite to each other. When the detector moves in the Y direction, a decrease in the sensitivity of one of the X-direction detecting elements is compensated for by an improvement in the sensitivity of the other element. This also applies to the Y-direction detecting elements. Accordingly, position detection outputs of the X direction and the Y direction can be accurately obtained from the detector.

Abstract: The invention seeks to provide a rotor for use in rotary encoder, which is increased in magnetic intensity and mechanical strength thereby achieving exact detection of rotation speed. A corner portion formed between a cylindrical portion 21 and a mounting flange 22 of a core 20 constitutes a protrusion 23 unitized with the cylindrical portion and the mounting flange, protruded from axial one end of the cylindrical portion 21 and opened toward the axial other end thereof. A part of a pulser ring 31 is disposed in the protrusion 23.

Abstract: Apparatus for detecting a passing magnetic article includes a peak detector providing a detector output signal that changes state when the magnetic field signal differs from a magnetic field tracking signal by more than a threshold offset amount. The threshold offset amount is dynamically variable in response to detection of a speed of rotation of the magnetic article and a peak-to-peak signal level of the magnetic field signal.

Abstract: Power transmission monitoring systems includes rotation speed sensors mounted to hubs of a power transmission pulley. A sensor comprises a rotation sensing device, and a controller receiving rotation data therefrom and determining rotation speed of the pulley. A transmitter transmits rotational speed of the pulley to a receiver, which may include or be connected to a device that compares the rotational speed to rotational speed in transmissions from other sensors to determine slip in the power transmission system. The rotation speed sensing device may be an accelerometer, or a gravitational torque harvester. A harvester might include a rotor body rotating with the pulley and mounting induction coils, and a gravitational torque stator mounting an induction magnet and including an air vane damper maintaining the stator stationary with respect to the rotor, through air resistance. The transmissions may be employed to monitor, maintain and repair the power transmissions system.

Abstract: A method and system for measuring a characteristic of a machine is provided. The system includes a speed sensor including a housing, a variable reluctance sensor (VRS) mounted at least partially within the housing, and a digitization circuit electrically coupled to an output of the VRS. The digitization circuit is also mounted within the housing and is configured to convert a substantially sinusoidal output of the VRS into a digital output signal.

Abstract: Magnetically encoded shafts for use in detecting forces exerted on the shaft during operation. Magnetically encoded regions arranged in tracks or bands, encircle the shaft and are formed within or affixed to the shaft. The magnetically encoded regions define force-sensitive regions therebetween. Magnetic fields surround the force-sensitive regions and are altered by force vectors passing through the force sensitive region. These magnetic fields are sensed by magnetic field sensors to determine various shaft parameters including, for example: shaft rotational speed, shaft rotational position, and forces exerted on the shaft, e.g., torque, bending forces, stress forces and strain forces. To provide continuous detection of shaft operational parameters and forces, dead zones between magnetically encoded regions are aligned with force sensitive regions associated with magnetically encoded regions in other bands.

Abstract: A magnet held in a magnet holder is constrained against radial or axial instability, or against both, by a shape on either component in contact with complementary shape on the other component, the shaped components generally defining a tab-and-slot arrangement. The magnet component may be a bonded magnet and in one embodiment may be formed in place by injection molding. The magnet also will exhibit improved magnet properties when magnetized to have lines of polarity matching a path defined by the bulk of the magnetic material as governed by the location of tabs on the magnet. The invention is useful in magnet-sensor assemblies found in industrial applications and in automotive applications such as power steering systems.

Abstract: A system with a self-powered sending unit communicating with a receiving unit. The sending unit interacts with a magnet attached to a rotating or moving member. The sending unit includes an inductor that intercepts the magnetic field from the magnet. The magnetic interaction with the sending unit generates power that is stored for later use by a transmitter. The magnetic interaction also provides a trigger for the transmitter that causes the transmitter to send a signal using the stored energy. In one embodiment, the signal includes a identification code that uniquely identifies the sending unit. A receiving unit includes a receiver responsive to the transmitted signal and, in one embodiment, a display of the measured parameter that is projected by a heads-up display unit.

Abstract: An ABS tone ring is made of a thermo-set plastic material transparent to electro-magnetic radiation. A plurality of discrete, spaced magnets or ferro-magnetic buttons is arrayed in a circle, embedded in the tone ring. The thermo-set plastic is heat tolerant and resistant to road salt and oxidation and protects the magnets or buttons from oxidation and corrosion.

Abstract: A method and apparatus for manufacturing a tonewheel for vehicles. The method includes machining a material into a tonewheel shape, manufacturing a semi-finished tonewheel product having a sensing part in which a plurality of sensing holes is formed at regular intervals in a circumferential direction of the sensing part, by machining the tonewheel shape manufactured at the forming step, and manufacturing a finished tonewheel product having a sensing part of which deformation is recovered, by processing the sensing part of the semi-finished tonewheel product, which is deformed to be curved at the sensing-hole machining step, through a restrike mold. The apparatus is capable of performing the method.

Abstract: A magnetic field sensor for low power applications includes a magnetic field sensing element that, during sample intervals, provides a signal proportional to a sensed magnetic field and also includes a comparator circuit that, during the sample intervals, compares the magnetic field signal to threshold levels to generate a sensor output signal indicative of a strength of the magnetic field. According to a dual sample rate feature, initially the magnetic field signal is sampled at a first predetermined sample rate and, following detection of a transition of the sensor output signal, is sampled at a second, faster predetermined sample rate for a predetermined interval. According to a user-programmable sample rate feature, a user may select to operate the sensor at a fixed, predetermined sample rate or at a user-specified sample rate. The magnetic field sensor may also or alternatively detect the speed and/or direction of rotation of a rotating magnetic article.

Abstract: A disc brake assembly includes a rotor with an ABS tone ring insert assembly that functions as a rotation indicator in an anti-lock braking system. The insert is positioned in the hat of a rotor disc in a spaced relationship and is mounted to the mounting flange of the rotor disc. Forming the ring insert separately from the rotor disc also allows different coating materials to be used on the tone ring that may be more heat resistant. The ring insert assembly can be made of powder metal or made as a cast iron cylinder with a toothed cap made of powder metal having a corrosion resistant coating. Cost savings can be realized along with high performance when only a portion of the assembly if made of powder metal and coated.

Abstract: A wheel speed transducer including a magnetic device associated with a wheel and a sensor device associated with the axle of the wheel provides data indicative of the velocity of the wheel. A processor located at the axle receives the wheel speed data and processes it to perform antiskid control functions. The velocity data is stored in a data concentrator also associated with the axle. A tire pressure sensor, a brake temperature sensor and a brake torque sensor, each associated with the wheel, send data to the processor at the axle, for storage in the data concentrator. A transmitting antenna associated with the axle and in communication with the data concentrator transmits stored data to a receiving antenna associated with the wheel. A data port at the wheel and in communication with the receiving antenna provides an interface to an external device for receiving the data.

Abstract: To downsize a bearing assembly with a rotation detection device, a magnetic generating element (2) having a directionality about a rotation axis O is provided on an inner race (21) side of the bearing assembly (20). A rotation sensor (3) capable of detecting a magnetism of the magnetic generating element (2) and outputting information descriptive of rotation or angle is fitted to an outer race (22) side in alignment with a bearing axis. The magnetic generating element (2) is fixed to a fixing member, for example, a rotary shaft (10) that is fixed to an inner diametric side of the inner race (21) of the bearing assembly (20).

Abstract: A sensor magnet holder is mounted on a motor shaft, and a sensor magnet is provided relative to a magnetic induction sensor on the non-moving side for obtaining a signal indicative of a rotational position of the motor shaft. The sensor magnet holder integrally forms a cylindrical portion, a flange portion of a terminal end of the cylindrical portion having a large diameter, a magnet rear end holding portion of the other terminal end of the cylindrical portion and a plurality of snap fit board portions. A shaft press fit portion is formed on an internal diameter of the flange portion. The plural snap fit board portions extend from the cylindrical portion in an axial direction of the motor shaft. A magnet front end holding portion is formed at an extending tip over an outer diameter surface of each of the snap fit board portions.

Abstract: A sealing device for an antifriction bearing includes a fixed support and a rotating support, the sealing device comprising a metal frame designed to be associated with a support of the bearing and a sealing joint, the frame including an annular seat and, secured to the seat, electronic identifying means consisting of a transponder connected on a communication antenna, wherein the antenna has an at least semi-annular or annular shape which is designed to be urged opposite the seat, the identifying means being secured to the seat via an insulating material layer which is interposed between the antenna and the seat so as to provide electromagnetic insulation for the antenna.

Abstract: Disclosed is a base module for a motion sensor, particularly a tacho generator, phase transducer, or transmission sensor for a motor vehicle. Said base module (22) comprises at least one busbar (11) for contacting an integrated circuit (36) used for sensing a motion. The base module (22) further comprises at least one wiring means (12, 14) which is arranged on the busbar (11). The busbar (11) and the wiring means (12) are surrounded at least in part by a sheath (26).

Abstract: A probe with plural output channels for sensing the movement of a body of magnetic material. The probe includes a magnetically energizable pole piece and a plurality of electrically conductive circuits, coupled to the magnetic pole piece, such that a change in magnetic flux in the pole piece caused by movement of the body relative to the pole piece induces a voltage in each of the circuits. The electrically conductive circuits are wound around each other in a symmetrical fashion such that in the vicinity of the magnetic pole piece each circuit experiences substantially the same change in magnetic flux. A probe of this type provides a plurality of substantially identical output signals and is easy to manufacture and replicate.

Abstract: In order to measure a speed of a vehicle having an antenna and travelling on a track formed by two rails, first and second discontinuities are detected. The first discontinuity is detected in a current or voltage of a signal generated by an antenna when the vehicle passes a first tuning block of an electric joint. The second discontinuity is detected in a current or voltage of a signal generated by the antenna when the vehicle passes a second tuning block of the electric joint. The detected discontinuities are used to measure the speed of the vehicle travelling on a track divided in track sections separated by electric joints. Each electric joint includes two tuning blocks and a predetermined length of a track section, wherein each of the tuning blocks allows power coupling between adjacent track sections.

Abstract: A sensor-equipped structure of a vehicular-wheel bearing assembly mounted to an outer ring member of a vehicular-wheel bearing assembly, is provided with a sensor portion for detecting the rotation of an inner ring member rotatably disposed on a radially inner side of the outer ring member, and a cover formed of a metal. The sensor portion includes a sensor element for magnetically detecting the rotation of the inner ring member; a connector for supporting a terminal electrically connected with the sensor element; and a capacitor. The sensor portion is molded of a synthetic resin and unified with the cover. The cover has a through hole, the synthetic resin extends from an inner side of the cover through the through hole into the connector, the synthetic-resin is in contact with an inner surface of the cover and not in contact with a circumferential surface of the cover defining the through-hole.