Abstract: The motion detector includes at least one element moving at least temporarily, a circuit assembly for sensing the motional condition of the element comprising at least one sensor located adjoining the element and including a timed pulse activated oscillating circuit which is differingly damped depending on the motional condition of the element, a signal processing circuit for forming the signals of the oscillating circuit suitable for analysis in an analyzer receiving and analyzing the signals output by the signal processing circuit. The signal processing circuit of the motion detector includes a comparator, to the input of which at least the positive or negative half waves of the oscillating circuit signals are applied and to the other input of which a reference voltage is applied selected so that when the sensor is activated the output signal of the comparator changes its condition differingly frequently depending on the how the sensor is damped by the element.

Abstract: A bicycle pedal, having a pedal shaft which has an end surface in which a blind hole is formed, is provided with a permanent magnet which is designed to interact with a sensor of the pedalling cadence, provided on the frame of the bicycle. The permanent magnet is housed within the blind hole and retained simply by magnetic attraction, if the pedal shaft is made from ferromagnetic material, or, for example, if the pedal shaft is not made from ferromagnetic material, by means of an auxiliary element of ferromagnetic material which is fixed within the aforesaid blind hole and to which the permanent magnet adheres simply by magnetic attraction.

Abstract: A wheel speed sensor assembly improves the performance and also simplifies manufacturing. It includes a one-piece pole and magnetic flux concentrator having first, second, and third regions of distinct diameters. Overmolded components at opposite ends of the pole/concentrator provide a cavity for the winding that eliminates the conventional use of a bobbin. A magnet is received over the pole between the first end and the intermediate region so that the magnet is more closely disposed adjacent the pole end of the sensor assembly. A molded end cap is provided at the opposite end of the assembly and one cap design can be easily substituted for another as desired.

Abstract: A non-contact rotation speed and torque sensing device which detects the inhomogeneities in the magnetic properties of a rotating element (4). An alternating magnetic field is applied in the region of a rotating element (4) and a signal representing the change in magnetic flux caused by the inhomogeneities of the magnetic structure of the object is received at a sensor (1). Using mathematical methods, in particular, auto-correlation, based on the signal received at a sensor (1), the speed of rotation of the element (4) may be determined through inspection of the periodicity of the signal Two sensors (1, 8) may be placed a pre-determined distance apart along the length of the element (4) and using mathematical methods, in particular, cross-correlation, based on the signal received from each sensor (1, 8), the torque applied to the element (4) may be determined.

Abstract: Sealing device (1) for a rolling bearing (2) which is provided with an inner race (5), which is axially blocked by a blocking element (4) which is suitable for being arranged in direct contact with a feedback element (6); the sealing device presents a support element (9) which is mounted on the inner race (5), an encoder wheel (8) which is installed on the inner race (5) and which is an integral part of the support element (9) itself, and a static sealing element (10), which is also an integral part of the support element (9) and which, in turn, presents two lips (21, 22) which are substantially parallel in relation to each other and which extend opposite the support element (9), a first lip (21) of the two lips (21, 22) extends towards the feedback element (6) and comes into contact with it, and a second lip (22) of the two lips (21, 22) extends towards a frontal surface of the inner race (5) and comes into contact with it.

Abstract: Disclosed is a wheel speed sensor for a vehicle which has a function of detecting revolution of the wheel in order to provide a uniform braking power when a vehicle brakes. The wheel speed sensor is installed at a position adjacent to a sensor rotor of a hub in the vehicle. Guiding bosses protrude from an outer periphery surface of the bobbin in the radial direction. An injected and molded housing encloses the bobbin and the first lead frame, the second lead frame and the third frame. The rubber ring is fitted into the inserting groove to cause close contact with the inner side of the housing. From this structure, the wheel speed sensor can prevent a coil open circuit and has an enhanced durability.

Abstract: An electronic circuit measures a pulse frequency and/or a pulse period of pulses in a sensor signal originating in a sensor coil, the pulses being zero crossing pulses. The circuit includes a filter stage having an input connected to the sensor coil, the filter stage being for removing electrical noise from the sensor signal to provide a filtered sensor signal. The circuit also has a signal strength sensing circuit connected to receive at least one of the sensor signal and the filtered sensor signal, the signal strength sensing circuit producing a variable threshold signal, which is a substantially monotonically non-decreasing function of a strength of the sensor signal. A variable threshold zero crossing detector is connected to receive the filtered sensor signal and the variable threshold signal. The variable threshold zero crossing detector has an upper threshold to test for zero crossing in a positive direction and a lower threshold to test for zero crossing in a negative direction.

Abstract: Surveying device (1) for the running parameters of railway contact bearings (2) which is provided with a rotating race (3) and a non-rotating race (4) which are coaxial to a rotation axis (A) of the railway contact bearing (2) itself, the device (1) being provided with a sealing shield (5) which is mounted onto the non-rotating race (4); and which is also provided with a sealing lining/covering (7) which is integral with the shield (5), and which is in contact with a sliding surface (11s) which is in turn integral with the rotating race (3): the device also being provided with a signal generating element (15) which is integral with the sliding surfaces (3s) (11s) themselves and which is arranged inside the shield (5); and which is also provided with a sensor (16), which faces the generating element (15) in order to read the signal itself, and which is itself integral with the shield (5) in a position which is outside the railway bearing (2).

Abstract: A sensor retainer for a bicycle sprocket assembly includes an annular member for mounting and rotating coaxially with the bicycle sprocket assembly and a sensor element fixed to the annular member. Alternatively, the sensor retainer may include a fixing member for mounting a derailleur or other transmission to a bicycle frame and a sensor element mounted to the fixing member.

Abstract: A device for detecting the rotating speed of a fan motor includes a motor and a gear case fixed on the front side of the motor. Plural gears engaging with one another are provided in the gear case and one of them is embedded with a permanent magnet and further a magnetic inductive element is also installed inside the gear case to cooperate with the permanent magnet for operating together to detect the rotating speed of the motor.

Abstract: An axle unit for a vehicle is provided which comprises a hub that installs thereon a vehicle wheel and is rotatable together with the vehicle wheel, a hub bearing that is mounted on a vehicle body and rotatably supports the hub, a rotary encoder that is attached concentrically to the hub and is rotatable together with the hub, a cover that is made of a non-magnetic material and covers an open end of the hub bearing that is located on the side thereof where the rotary encoder is provided, a rotational speed sensor that has a detecting section that is made of a magnetic material and disposed outside the cover and so as to face the rotary encoder, and a magnetic body that is provided at a portion of the cover that is placed between the detecting section of the rotational speed sensor and the rotary encoder.

Abstract: An axle assembly includes an axle defining an axis, a wheel assembly rotatably supported on the axle for rotating relative to the axle axis, a magnet, a sensor responsive to the magnet for producing a count signal, and a microprocessor for receiving count signal data, calculating the distance the wheel assembly has traveled, and transmitting distance data to an output device. The sensor is mounted to rotate with the wheel assembly and the magnet is mounted to the axle, at a position eccentric to or radially offset from the axle axis. The sensor is mounted to the wheel assembly in radial alignment with the magnet such that rotation of the wheel assembly aligns the sensor for magnetic interaction with or responsiveness to the magnet once per revolution of the wheel assembly.

Abstract: This wheel speed detector is constructed of a magnetic sensor and a magnetic ring and is integrated with the inside of a seal device. The magnetic ring constitutes a part (core bar) of the seal device. This arrangement can enable the compacting and reduction in the number of components and improve space saving and assembling workability.

Abstract: A target wheel sensor assembly includes a target wheel, a magnet, and a sensing element placed therebetween. The magnet and the sensing element are configured so that as the target wheel rotates the sensing element outputs an asymmetric signal. This asymmetric signal is used to determine the position of the target wheel as it rotates and the direction of motion of the target wheel.

Abstract: A revolution detecting sensor includes a Hall IC facing a detection target, a magnet positioned behind the Hall IC and applying a bias magnetic field, and a substrate provided with a detecting circuit. The revolution detecting sensor is configured such that a lead terminal from the Hall IC bypasses the magnet, to be guided to the substrate. In a magnet holder holding the magnet, a recessed guide guiding the lead terminal is formed, and a pressing member is provided. Thus, a tip end portion of the lead terminal can be held in a prescribed position, and an operation for attachment to the substrate can easily be performed.

Abstract: Each embodiment (10, 110 and 210) includes a magnetic element (12, 112 and 212) producing a magnetic field. In the first embodiment (10) of FIG. 1, the magnetic element (12) comprises a magnetic bit strip disposed extending in a circular arc on a fixed or stationary plate (14). In the second embodiment (110) of FIG. 2, the magnetic element (112) comprises a magnetic bit strip supported on a movable bar or rod (114). In the third embodiment (210) of FIG. 3, the magnetic element (212) comprises a magnetic bit strip disposed in a rectilinear path on a stationary plate (214). An electrical resistor (16, 116 and 216) is included for changing in electrical resistance in response to changes in the magnetic field produced by the magnetic element (12, 112 and 212). The resistor (16, 116 and 216) comprises a giant magnetoresistive sensor.

Abstract: A shaft revolution counter including one or more reed magnetic sensors interacting with one or more magnets attached to the shaft. The interaction generates voltage spikes in the reed magnetic sensors that are used as input signal to an electronic non-volatile counter, as well as its sole power source.

Abstract: The invention relates to a position and/or speed sensor comprising:

Abstract: A system that senses proximity includes a magnet producing a magnetic field and a sensor having a switch. The switch includes a cantilever supported by a supporting structure. The cantilever has a magnetic material and a longitudinal axis. The magnetic material makes the cantilever sensitive to the magnetic field, such that the cantilever is configured to move between first and second states. The switch also includes contacts supported by the support structure. The switch can be configured as a reed switch. When the magnet moves relative to the sensor, the cantilever interacts with a respective one of the contacts based on the position of the magnet during movement.

Abstract: An exciter ring assembly to detect rotational parameters of an axle within a tube has an exciter ring attached to the axle by an elastomer insert. The insert provides a frictional interference fit with the axle. The insert affixes the exciter ring to rotate with the axle. The elastomer insert is supplied with radially-spaced axial channels to enable oil flow past the assembly. The outer member of the assembly is press fit into the axle tube. The outer member remains stationary with respect to the axle tube. The outer member restricts the axial movement of the exciter ring and enables rotation of the exciter ring and provides oil flow across the exciter ring assembly.

Abstract: This ring speed detector is constructed of a magnetic sensor and a magnetic ring and is integrated with the inside of a seal device. The magnetic ring constitutes a part (core bar) of the seal device. This arrangement can enable the compacting and reduction in the number of components and improve space saving and assembling workability.

Abstract: A method and apparatus for providing information from a speed and direction sensor is disclosed The method and apparatus detect the presence of a ferromagnetic object as it moves past a sensor The sensor determines speed and direction information regarding the ferromagnetic object, and further provides information relating to the environment surrounding the sensor or object, such as the status of an air gap between the sensor and the moving object, and the temperature of the environment in which the sensor or object is disposed

Abstract: A pulse signal generator comprises a detection assembly including a magnetic field generator and a magnetic element wire able to cause a large Barkhausen jump such that it produces a pulse signal responsive to the movement of the object to be detected; a case for housing the detection assembly; an attaching member; and a positioning guide provided on the inside surface of the case to position the detection assembly at the desired position with respect to the object to be detected.

Abstract: An integrated control-unit and power-supply assembly usable on board a bicycle includes a box for containing an electronic control unit, the box being fixable to the down tube of the bicycle in the area where the bottle cage is fixed, or else underneath the crank case, and being provided with a receptacle-like tubular appendage which receives, by fast-coupling means, the end of a cylindrical battery holder. One end of the cylindrical battery holder carries a sensor device, for example a magnetically operated sensor, which is set at a distance from the crank pin that is substantially equal to the length of the crank arm. The sensor co-operates with a permanent magnet carried by one of the pedals to emit a pulse at each revolution of the crank arms. The assembly according to the invention can be exploited for carrying one or more sensors, of any type.

Abstract: The invention concerns an instrumented bearing (1) comprising an outer ring (2), an inner ring (4), at least a row of rolling elements (6) arranged between a raceway of the outer ring (2) and a raceway of the inner ring (4), an assembly detecting rotation parameters comprising a sensor unit (11) integral with the non-rotating ring and supporting a sensing element (14) and a rotating coding member (16) forming a rotating part with the rotating ring, the coding member comprising an active part moving in rotation in front of the sensing element, the sensing unit and the non-rotating ring forming a fixed part. The rotating part comprises indexing means external to the active part of the coding element and capable of positioning at an angle said rotating part relative to a reference of the fixed part in a position wherein the coder generates in the sensing element a reference signal.

Abstract: A sensor assembly includes a spool that has magnetic filaments incorporated therein. The magnetic filaments are magnetized to create a magnetic flux around the spool. A coil is wound around the spool such that it is within the magnetic flux field generated by the spool. A target wheel having plural teeth and plural slots is placed so that its outer periphery is slightly spaced from the target wheel. As the target wheel rotates, it induces changes in the magnetic flux density sensed by the coil. The changes in flux density can be used to determine the angular position and angular speed of the target wheel and a moving part attached thereto. Since the spool is magnetized, the need for a separate magnet is obviated.

Abstract: A magnetically encapsulated coil package of a variable reluctance sensor, wherein the magnetic encapsulation distributes the magnetic flux such as to permit the coil winding to be axially elongated with respect to the magnet, yet the signal output therefrom is suitably large. The variable reluctance sensor includes an annular magnet having alternating di-poles; a toothed wheel having an annular toothed portion, wherein the toothed portion is disposed proximally to, and concentrically inside, the magnet; and an encapsulated coil package which includes an annular coil disposed in axially offset relation to the annular toothed portion and the annular magnet; and a magnetically conductive capsule having an inverted U-shaped cross-section which serves as a return path for magnetic flux of the magnet and constrains magnetic activity to the interior space thereof.

Abstract: A pulse signal generator comprises a detection assembly including a magnetic field generator and a magnetic element wire able to cause a large Barkhausen jump such that it produces a pulse signal responsive to the movement of the object to be detected; a case for housing the detection assembly; an attaching member; and a positioning guide provided on the inside surface of the case to position the detection assembly at the desired position with respect to the object to be detected.

Abstract: A magnetic detection apparatus is able to ensure good performance in detecting the position of an detected portion even with a shift or displacement in the position of a magnetoelectric conversion element. The magnetic detection apparatus includes at least one magnetoelectric conversion element 15 disposed to face one of teeth 12a and grooves 12b of a rotating member 11, a magnet 14 with a direction of magnetization thereof oriented in a direction perpendicular to a radial direction of the rotating member 11 in which the magnet 14 faces the rotating member 11, and a magnetic guide 21 having a first pole projection 21a and a second pole projection 21b formed in a spaced apart relation with respect to each other in a radial direction of the magnetic moving object in which the magnetic guide 21 faces one of the teeth 21a and the grooves 21b of the rotating member 11.

Abstract: A kind of two-wire direct current electric fan system with countable rotation rate, which is used in the systemic radiating electric fan of an information processing device. It contains a two-wire direct current electric fan, a rotation rate inducing circuit, a pulse amplifying circuit and a counting circuit. The system of the invention utilizes the rotation rate inducing circuit of the two-wire direct current electric fan, which is installed on the motherboard of the information processing device. It converts the rotation of the electric fan into a pulse, and amplifies the pulse to a detectable level. The rotation rate of the electric fan is then determined by the counting circuit on the motherboard. The invention uses a two-wire electric fan to achieve the objective of rotation rate counting.

Abstract: The ring magnet speed and direction sensing scheme according to the present invention addresses many of the shortcomings of the prior art. In accordance with various aspects of the present invention, a pair of bridges placed on the same semiconductor chip are provided for sensing the passing of north/south transition points on a ring magnet. In accordance with an exemplary embodiment, the bridge contains a first group of runners that are perpendicular to a second group of runners. The bridges are placed to cause the signal from one bridge to slightly follow the signal from the other bridge. Placement of the bridges on the same chip enables highly accurate readings.

Abstract: A wheel bearing assembly is provided which has a rotating speed sensor unit which includes a seal for preventing entry of foreign matter and which takes up little space and thus can be mounted on the wheel bearing assembly without increasing the axial dimension of the fixed member of the wheel bearing assembly. The assembly includes a fixed member fixed to a vehicle body, and a rotary member rotatably supported in the stationary member through a bearing and mounted to a vehicle wheel. An annular sensor is fitted to a knuckle, which is a part of the fixed member, on the inboard side of the bearing. A sensor seal is fitted to the annular sensor and has a seal lip kept in slide contact with a seal land formed on a constant-velocity joint outer ring, which is a part of the rotary member, to define a sealed space on the inboard side of the bearing. An encoder is mounted on a bearing inner ring, which is a part of the rotary member, in the sealed space.

Abstract: A sensor of position and/or of displacement of a moving member generating magnetic pulses. The sensor comprises a plurality of aligned sensitive elements that are divided into at least two subassemblies. The signals emanating from the subassemblies are processed by an electronic circuit able to deliver two analog signals in substantially perfect quadrature.

Abstract: A motor speed sensor and a magnet and hub assembly for increasing the life of a motor speed sensor are disclosed. The motor speed sensor includes an encapsulation solution preserving the connection between Hall device leads sensor leads. The motor speed sensor may include a location tab extending outwardly from a raised periphery of its sensor housing which fits into a recess within a motor end shield. The magnet and hub assembly is securable to an armature shaft of a motor without screws.

Abstract: A magnetization yoke having an exciting coil wound thereon is arranged to hold a magnetic member and a metal ring so that a magnetic flux passes through and magnetizes the magnetic member in the portion held by the magnetization yoke for successively magnetizing the magnetic member along the circumferential direction thereby multipolarly magnetizing the magnetic member in the circumferential direction. Thus, a magnetic encoder having large magnetization strength and a small magnetization pitch error, a wheel bearing employing the same and a method of manufacturing a magnetic encoder can be obtained.

Abstract: A shaft revolution counter comprising one or more reed magnetic sensors interacting with one or more magnets attached to the shaft. The interaction generates voltage spikes in the reed magnetic sensors that are used as input signal to an electronic non-volatile counter, as well as its sole power source.

Abstract: In an electronic sensor having a spool with a bore therein for receiving a pole and a magnet adjacent to the pole and a magnet wire wound around the spool forming a coil and the ends of the magnet wire are each coiled around respective electrically conductive legs of a terminal for electrical output from the coil to an external circuit, the legs of the terminal are provided with bumps or protuberances stamped thereon. The bumps have a height greater than the thickness of the magnet wire to protect the magnet wire during installation of a housing covering.

Abstract: A speed sensing seal with a first support member, a second support member, a magnetic elastomer member, a sensor member and an elastomeric seal member is disclosed. The magnetic elastomeric member with alternating adjacent poles is formed on the first support member and the sensor member is attached to an aperture in the second support member and overmolded with a layer of elastomer. The first and second support members are formed in the unitized body to form an internal cavity which contains the sensor, magnetic member, and the elastomeric seal. The first support member has a low wear surface to reduce initial seal failures and to enhance seal life.

Abstract: In a vehicle wheel rotation detecting system, a signal input portion of an ECU accurately detects a vehicle wheel speed and a rotating direction of the vehicle wheel speed of the respective wheels. On the basis of the detected results, the respective computers are operated to perform ABS control, TC control and VSC control. When a computing result of the vehicle wheel speed is equal to or greater than a predetermined value, a change in the rotating direction is inhibited. This may prevent an error in the result of detection of the wheel rotating direction owing to an external magnetic filed and the like so as to further optimize the vehicle state control.

Abstract: An apparatus and method for determining linear and angular velocity of a moving body. A magnet is attached or fixed to the body, the velocity of which is to be determined. The apparatus comprises a sensor comprising a core of magnetic material and a coil wound about the core. The movement of the body and magnet relative to the core effects a time-varying magnetic field between the magnet and the core thereby producing Barkhausen effect time-varying voltage signals in the coil. The apparatus further comprises a system for detecting and processing the time-varying voltage signals so as to effect a transformation of the signals into data defining the velocity of the moving body.

Abstract: In the inductive motion sensor, there are provided magnetic field generating means (4, 5, 7, 8) for generating a magnetic exciting field and a measuring device for measuring a mutually induced measurement magnetic field as a measure of the motion. The measuring device is arranged with an offset from the magnetic field generating means in the motion direction and is thereby no longer subjected to the temperature-dependent variations of the exciting field.

Abstract: A pulse signal generator comprises a detecting assembly including a magnetic element wire (5) and a coil (2) wound around a bobbin (6) to generate electric pulses and a waveform shaping circuit integrated with the detecting assembly so as to shape the waveform of the electric pulses to output a pulse signal.

Abstract: A sensing system for measuring the angular displacement of a rotating shaft is disclosed. The sensing system comprises a rotor and a sensor assembly disposed within the rotor. The rotor is constructed and arranged to be securably mounted to the shaft such that the rotor rotates in concert with the shaft. Furthermore, the rotor defines a plurality of teeth extending radially inwardly towards a center of the shaft. The sensor assembly comprises a sensor housing and a magnet arrangement disposed within the housing. The magnet arrangement defines a magnetic flux path between the sensor assembly and the rotor. As a result, the magnet arrangement and the rotor cooperate to define a magnetic circuit. Changes in magnetic flux through the magnetic circuit can be measured to determine the angular displacement of the rotating shaft.

Abstract: A rotation detecting device has various portions that are covered with a resin-molded section. After integrally molding the first and second cores 8 and 9, permanent magnet 10, and terminal 14 within a resin-molded section 11, a coil 12 is wound in a slot section 11a formed in the resin-molded section 11. Then, of the resin-molded section 11, the coil 12 and the terminal 14 are electrically connected in a recess formed at an outer periphery of the resin-molded section. Accordingly, the coil 12 is not liable to be damaged by a contact of a high-temperature, high-pressure resin during the molding process.

Abstract: A combined hub temperature and wheel speed sensor system comprises a sensor assembly coupled to an axle and a wheel assembly fixedly coupled to the wheel, which in turn is free to rotate with respect to the axle. The wheel assembly includes a ring magnet. The sensor assembly includes a temperature sensor in proximity to the wheel bearing, Hall effect sensors positioned to detect the rotation of the ring magnet, and a circuit for generating and transmitting signals corresponding to the wheel rotation speed, rotation direction, and bearing temperature.

Abstract: A wheel speed sensor and bearing assembly for use in a wheel end assembly of a vehicle. The assembly includes an outer race, an inner race, a bearing unit, a spindle, a wheel speed sensor and a tone wheel. The outer race includes an opened inboard end, an opened outboard end, and at least one bearing seat. The inner race includes at least one bearing seat. The bearing unit is disposed between the bearing seats of the outer race and inner race. The spindle is adapted to be secured to a fixed component of the vehicle and includes an inboard end, an outboard end, and an opening formed therethrough. The wheel speed sensor is operatively connected to the spindle adjacent the outboard end thereof. The wheel speed sensor includes an outer magnet surface. The tone wheel is operatively secured to the outer race adjacent the opened outboard end thereof. The tone wheel includes an inner surface which is positioned in a spaced apart relationship relative to the outer magnet surface of the wheel speed sensor.

Abstract: An electronic speed-measuring device for a beach buggy includes a magnetic member and a sensor. The magnetic member is fixed on the chain wheel driven by an engine of a beach buggy so the magnetic member rotates together with the chain wheel. The sensor is provided on an unmovable portion of a beach buggy, facing the moving track of the magnetic member and maintaining a proper distance from them. The sensor can detect the function of the magnetic member and transmit immediate digital data (signals) to a speedometer so that the speed of a beach bugay shown on the speedometer is extremely precise, achieving practical effect of installing with quickness and detecting speed with precision.

Abstract: A measuring standard to measure the rotational speed of a machine is described. A ring (4) is integrally secured to the periphery (1.1) of a drum-shaped base member (1), by using soldering in accordance with the present invention. Through soldering, a stable measuring standard for an angular-position measuring system is created for high rotational speed applications.

Abstract: An apparatus for attaching sensors to rotating shafts on equipment includes a cup magnet and a housing for receiving the cup magnet. A target rotor is displaced within the housing which rotates when attached to a rotating shaft for the purpose of sensing the shaft rotation. Alternately, the cup magnet may be permanently attached to a rotating couple rather than a non-rotating housing. A preferred embodiment may have a dust cover.

Abstract: A transducer comprising a fixed part and a mobile part which are mounted for relative motion about a given axis. On the shaft of the rotor part there is fitted a magnetized element consisting, for example, of an annular element diametrically magnetized at a single pair of poles. Mounted on the fixed part is a pair of Hall-effect sensors which are set angularly staggered by 90° about the axis of rotation of the shaft. The Hall-effect sensors generate corresponding output signals having values that vary in a continuous range. The values of the output signals generated by the transducer uniquely identify the relative positions of the aforesaid fixed and mobile parts with respect to the axis of rotation.