Abstract: A vehicle hub and bearing assembly which includes a sensor for use with an anti-lock braking system (ABS). The hub and bearing assembly includes a hub which rotates relative to a bearing pack assembly adapted to be mounted to a steering knuckle to other suspension component. A sensor exciter ring is fit onto the hub and rotates with the hub upon wheel rotation. An ABS sensor is mounted directly to specially formed mounting features defined by the projecting mounting flange of the bearing pack. With the sensor being mounted directly to the bearing pack, an accurate radial clearance between the exciter ring and sensor can be provided with a minimal number of assembled components defining the radial clearance. This design provides enhanced control over sensor radial clearance, tends to maintain radial clearance for a longer period of time, and allows radial clearance to be set for the hub and bearing sub-assembly which does not require subsequent adjustment by the motor vehicle manufacturer.

Abstract: A multipolar magnetic ring is fomred by joining together two rings having the same geometry and magnetic characteristics. The coaxial rings have circumferentially spaced apart teeth which form identical magnetic poles. The magnetic poles of each ring are embedded into the spaces separating the magnetic poles of the other ring. The magnetic poles of each ring have the opposite polarity to the polarity of the adjacent poles of the other ring.

Abstract: A circumferential type wheel speed sensor is axially fitted in removable fashion over a specially designed elastomer sleeve molded to the outside of a cylindrical casing wall. The sleeve also fills in and seals an array of slots cut through the wall, which cooperate with teeth on a flux ring to create a strong signal. The sensor can be removed for service without removing or creating exposing openings through the seal.

Abstract: The invention relates to an electric motor comprising a rotor (1), a stator (2) and at least two pole pairs. One particularly preferred application of the electric motor according to the invention is small-size accurate servomotors of high capacity. At present the feed back information required by servomotors is generally obtained from at least partially separate transduced means attached to the servomotor, such as an optical or magnetic coder, a tachogenerator or resolver. A drawback of these known solutions is mainly that the volume and weight of the motors is high. This problem is eliminated in the motor according to the invention by providing it with an integral resolver so that primary windings (4a, 4b) of the resolver is arranged in the rotor (1) of the motor, and that secondary windings (11a, 11b) of the resolver are wound round the stator (2) of the motor in such a manner that the winding wire goes alternately inside and outside the stator.

Abstract: There is described a speed sensor that is particularly adaptable to moving vehicles such as automobiles. A permanent magnet, stator assembly, and field coil are held within a ferromagnetic cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. A rotor assembly is carried by the wheel spindle. The rotor assembly has poles spaced entirely around the circumference of a circle while the stator assembly has only a few poles distributed over an arc of a portion of a circle. A magnetic flux is provided by the permanent magnet, which flux passes through the stator poles and the rotor poles. The ferromagnetic cup completes a flux path between the stator and rotor poles, and also to the magnet. The rotor poles rotate with the wheel, causing a changing magnetic flux which in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.

Abstract: A vehicle non-driving wheel hub mounting equipped with a pulse-transmitter and sensor assembly comprises an integral rolling bearing (1, 2, 11, 12) with two rows of rolling elements (1). The active parts (16, 17) of the pulse transmitter and the sensor (18) are accommodated and positioned inside a volume delimited radially by the cylindrical inner surface (10) of a tubular protuberance (7). The protuberance also centers the brake disc (5) or drum and the wheel (6). The volume is delimited axially in one direction by a plane passing through the free end (20) of the tubular protuberance (7) and in the other direction by a plane passing through the large face (21) of the inner ring (11) of the rolling bearing located on the same side as the locking nut (15). The inner rings are axially locked by a locking component, and the sensor is radially inserted in a radially oriented receptacle formed in an external surface of the locking component.

Abstract: There is described a speed sensor that is particularly adaptable to moving vehicles such as automobiles. A permanent magnet, stator assembly including a stator pole piece, and field coil having an aperature are held within a cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. The stator pole piece is carried substantially within the aperature of the field coil. Rotor poles are carried on the wheel spindle. A magnetic flux is provided by the permanent magnet, the flux passing through the stator poles and the rotor poles which rotate with the wheel in close proximity to the stator assembly, causing a changing flux field. The changing magnetic flux in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.

Abstract: A hybrid electrical generator (20) is disclosed. The hybrid electrical generator has a permanent magnet generator (22) having a permanent magnet rotor (32) mounted on a shaft (26) with the permanent magnet generator providing an output voltage over an operating range which falls in response to an increasing electrical load. The hybrid electrical generator has a variable reluctance generator (24) having a rotor (34) mounted on the shaft with excitation of a stator (30) being provided by the permanent magnet generator. The variable reluctance generator provides an output voltage which varies in response to an increasing load over an operating range. A voltage regulator, responsive to the electrical outputs of the generators, controls the output voltage of the variable reluctance generator to provide a regulated output voltage which is substantially constant independent of electrical load over an operating range.

Abstract: There is described a speed sensor that is particularly adaptable to moving vehicles such as automobiles. A permanent magnet, stator assembly, and field coil are held within a cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. Rotor poles are carried on the wheel spindle. A magnetic flux is provided by the permanent magnet, the flux passing through the rotor poles which rotate with the wheel and through poles of the stator assembly. As the wheel turns, the rotor poles are at times aligned with the stator poles across on air gap and at other times not aligned across an air gap, the air gap being in a plane parallel to the plane in which the wheel rotates. This results in a changing magnetic flux, which in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.

Abstract: An apparatus for sensing the angular velocity of a vehicle wheel includes a sleeve, a tone wheel detachably coupled to the sleeve, and an electromagnetic sensor. The sleeve can be rotatably mounted on bushings inside a differential housing. The electromagnetic sensor extends through a wall of the housing into close proximity to a periphery of the tone wheel which has a plurality of generally radially extending evenly spaced teeth formed thereon. The tone wheel is positioned on the sleeve between a pair of retaining rings and is keyed for rotational movement with the sleeve. An inner end of the sleeve has means for coupling to the side gear of a differential carrier assembly. In one embodiment, the means for coupling includes tabs formed on the sleeve and cooperating slots formed on a side gear. In another embodiment, lugs formed on the sleeve engage driving surfaces formed on the side gear.

Abstract: A pulse generator in which a magnetic circuit is closed by a portion of a wall (5) of a cylindrical part rotating about its axis and coupled at one of its ends to a drive member (7). The wall portion and a fixed part (1) together define an air gap which varies depending on the relative angular positions of the wall portion and the fixed part such that during rotation magnetic field variations are generated at a frequency proportional to the speed of rotation of the rotating part. The generator includes an electrically conductive winding (4) in which the field variations generate electrical pulses, and the rotating cylindrical part (5) includes at least one longitudinal slot (8).

Abstract: A pulser ring has cylindrical inner and outer rings nested together. The inner ring is formed at its one end with protrusions arranged at equal angular intervals. The outer ring is in the shape of a round comb and has its teeth engaged at a portion near the tip thereof in the grooves defined between the adjacent protrusions formed on the inner ring. The tip of each tooth protruding from the grooves is bent radially inwardly so as to engage the end face of the protrusion on the inner ring, thus coupling the inner ring and the outer ring together.

Abstract: A dual speed sensor pickup assembly (140) for sensing the rotational velocity of two independently rotatable, closely axially spaced exciter rotors (116 and 118) is provided. The pickup assembly includes two speed sensor assemblies (136 and 138) each including a pole piece (152,160) having a longitudinal axis (152a,160a) with the longitudinal axes skewed relative to one another but radial relative to the common axes of rotation (24) of the exciter rotors. Each speed sensor includes a permanent magnet (154,162) disposed between an end of the pole piece (152,160) and having a face divided into first and second surfaces (154a,154b and 162a,162b) by a slot (154c,162c) therein. In one embodiment a primary coil (156,164) and a secondary or anti-cross talk coil (158,166) surrounds the pole piece of each sensor (136,138), and each secondary coil is conductively connected to the primary coil of the other sensor.

Abstract: In a homopolar, switched reluctance, or interior permanent magnet motor, formed rotor laminations are employed to reduce eddy current losses in the pole faces and body of the rotor. The homopolar and switched reluctance motor lamination is comprised of a magnetic portion having a plurality of pole pieces extending generally radially outward from the core portion and forming a plurality of interpole spaces. Non-magnetic, high resistance segments are bonded between the pole pieces to minimize windage losses and increase strength. The non-magnetic segments may be thinner in the axial direction than the magnetic portion to prevent contact between stack laminations. Additionally, a gap may be left between the interior core portion and the non-magnetic segment to facilitate use of automated welding techniques.

Abstract: The invention consists of a toothed wheel which in conjunction with a fixed sensor measures the revolutions or the angular velocity of a rotating component. The toothed wheel is constructed as a coil spring mounted on a circular ring-shaped mounting device and moved around a pivot with the rotation motion to be measured. The coil spring consists of an infinite helix the windings of which are of ferromagnetic material. Since the coil spring is moved past the fixed sensor, the change of the magnetic field in the coil of the sensor causes the generation of an alternating voltage the frequency of which is substantially proportional to the angular velocity of the toothed wheel.

Abstract: There is described a speed sensor that is particularly adapted to moving vehicles such as automobiles. A permanent magnet, stator assembly, and field coil are held within a cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. A magnetic flux is provided by the permanent magnet and when rotor poles carried by the bearing assembly rotate in close proximity to the stator assembly, the magnetic flux in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.

Abstract: A compensation circuit for electrical generators is disclosed. In an electrical generator, the electrical current generated in the armature coil induces a magnetic flux in the flux path of the generator. The compensating circuit of the invention includes a conductor that surrounds a portion of the flux path of the generator. This conductor known as the compensating coil, is supplied with a compensating circuit which has a reactive component. The compensating current induces a secondary magnetic flux that has a component that opposes the flux induced by the armature current. In a further embodiment of the invention, a twin generator--generator or twin generator--motor is employed. The compensating coil surrounds the flux path of one of the generators and the other generator or motor is used to supply compensating current to the compensating coil.

Abstract: An alternating current generator for supplying the electrical loads on a motor vehicle. The generator has a stator core that carries a three-phase stator or output winding. The rotor of the generator has two claw pole members that are so oriented that the fingers of the pole members are aligned. Disposed between the two pole members is a third pole member having projections disposed between the aligned fingers of the claw pole members. The rotor has two field coils which are so arranged and energized that the magnetic polarity of the two claw pole members is the same and opposite the magnetic polarity of the third pole member. One of the field coils can be replaced by a permanent magnet and when this is done the generator is provided with a magnetic circuit that can divert permanent magnet flux away from the stator core. Flux diversion is controlled by supplying unidirectional current to the field winding under the control of a voltage regulator.

Abstract: In a dynamoelectric machine which includes a rotor and a stator, an integral magnetic isolation and cooling system. A housing is disposed about the machine, the housing being fabricated of magnetically permeable material to define a flux path therethrough. A cooling jacket is sandwiched between the housing and the stator. The cooling jacket has coolant passages therein and is fabricated of non-magnetic material to isolate the flux path between the housing and the stator.

Abstract: An angular position sensor for determining the relative angular position of two relatively rotatable ferromagnetic coaxial components, such as a rotor and stator. The components have the same number of regularly distributed teeth and the teeth in one component are separated by an air gap from the teeth in the other component. A plurality of coils are connected in series with each other and are disposed around the teeth in one of the components and correspond in number to the number of associated teeth. An electric excitation signal having a measurable constant electrical characteristic is fed to the plurality of coils from a source. The characteristic is modulatable in response to variations in the magnetic reluctance of the air gap effected by changes in the relative angular position between the two components. Electronic circuitry is connected to coils for measuring the modulation of the characteristics to determine the relative angular position of the components.

Abstract: A spool-like stator support structure for an inductor type dynamoelectric machine incorporates stamped, annular end plates. Each end plate has a plurality of spaced-apart recessed landings along its outer edge and, preferably, a plurality of axially outward extending tabs which cooperate to precisely position a plurality of circumferentially distributed generally U-shaped armature elements mounted thereon. The end plate is also provided with a rabbet or press fit along its radially inner edge for mating with an end of the central cylindrical tube of the spool-like support. Cooling ports also distributed about the inner edge of the laminated end plate provide for ventilation of the exterior of said central tube. The end plate can be assembled from a grouping of standardized stampings or from a single stamping.

Abstract: An in-axle wheel speed sensor exciter rotor assembly (100) for sensing the rotational speeds of a drive axle ring gear (14/30) and a drive axle differential side gear (48) is provided. The assembly includes a tubular member (102) having teeth (110) for engagement with slots (112) provided on the side gear hub (48a) and carrying a first exciter rotor (116) at the opposite end (114) thereof. A second exciter rotor (118) is axially retained on the tubular member axially adjacent the first exciter rotor and is rotatable relative thereto. The second exciter rotor carries a coupling device (124/128) for engagement with threaded bores (126) provided in the drive axle ring gear/carrier assembly to rotationally couple the second exciter rotor to the ring gear and to axially retain the assembly (100) within the drive axle.

Abstract: A dual speed sensor pickup assembly (140) for sensing the rotational velocity of two independently rotatable, closely axially spaced exciter rotors (116 and 118) includes two pole piece assemblies (136 and 138) having axes skewed relative to one another, but radial relative to the common axes of rotation (24) of the exciter rotors. Applications include drive axles and antilock brakes.

Abstract: A tachometer generator of the inductive pickup variety is disclosed, particularly adapted to be mounted in close proximity with a rotating multipole permanent magnet structure. The coil produces a voltage output proportional to the rate of change and magnitude of the magnetic flux of the rotating magnet. In accordance with this invention, an inductive pickup is disclosed having a core piece which acts as a conduction path for the magnetic field of the rotating magnet and further acts as a means for mounting the inductive pickup within the associated structure. Lead wires are imbedded within the bobbin and form protruding central conductors which act as posts to which each end of the coil wires are electrically and mechanically attached. The lead wires and core piece components are insert molded such that they are loaded into an injection molding die prior to the introduction of plastic material in a molten state which forms the bobbin component.

Abstract: A system is described for measuring the angular position of an internal combustion engine crankshaft, comprising a magnetic sensor and at least two projections provided on a flywheel which is rigid with the crankshaft. The main characteristic of the present invention is that the sensor has its longitudinal axis parallel to the axis of the crankshaft and is supported by that portion of the crankcase which faces the flywheel. As the projections pass in proximity to the sensor, this latter generates an electrical pulse which is utilized in a central control unit for electronic ignition and/or electronic injection.

Abstract: In a brushless synchronous generator having a three phase, WYE connected exciter armature providing current which is rectified by a half-wave rectifier before energizing a field of a main generator, a conductor is required to couple a neutral lead of the exciter armature to a negative input terminal of the main generator field.In order to overcome the foregoing problem, a rotary rectifier assembly for a brushless synchronous generator is disclosed. The rotary rectifier assembly comprises a housing, three diodes, three resistors, wherein the diodes and the resistors are interconnected to form a three phase half-wave rectifier bridge within the housing, and a neutral conductor coupled between the neutral output lead and the negative input lead and carried within the housing.

Abstract: The generator wheel is composed of a tooth part and of a marker part. The tooth part has a rotational axis and a coaxial tooth or toothed edge in the shape of a circular ring with teeth situated distributed over its circumference, some of said teeth being marker teeth which include a recess. The marker part is secured to the tooth part and contains sheet metal strips corresponding in number to the number of marker teeth, said sheet metal strips projecting into said recesses of the marker teeth. Marker part and tooth part are composed of materials having different eddy current losses.

Abstract: A bearing assembly comprising a bearing including an inner and outer rings one of which is fixed to a rotating member, and a pulser gear fixed to the rotating member. The pulser gear is composed of an annular magnetic plate member and having a plurality of punched through holes mutually separated along a circumferential direction thereof. Revolution of the rotating member can be detected by a sensor provided close to the pulser gear.

Abstract: The invention is a variable reluctance motor using a stator comprised of a plurality of single tooth poles, wound so that every other pole of the same phase is of oppposite polarity. A movable member is also provided with a plurality of single tooth pole members. The spacing of rotor and stator poles is equal.

Abstract: Two-phase voltage signals for use with a resolver-to-digital converter (RDC) are produced as a periodic function of permeance developed across an air gap between a rotor and stator wherein the permeance varies as a periodic sinusoidal function which can be related to the electrical angle of the position of the rotor. The two-phase voltage signals are developed as a function of inductive reactance and follow the form ##EQU1## wherein the phase angle between V.sub.x and V.sub.y is exactly 90.degree. and the term [A+A.sub.n +B+B.sub.n ] is completely free of second harmonics.

Abstract: An adjustable speed inductor type rotating dynamoelectric machine, capable of high speed operation, employs a stator assembly incorporating a spool-like support structure. A central, generally cylindrical portion of the support structure supports field windings while radially oriented end portions of the spool-like structure mount and accurately position a circumferentially distributed plurality of C-shaped armature core elements. Radially directed, angularly spaced grooves in the outer surfaces of the end portions receive legs of the C-shaped armature elements and serve to precisely position these elements in three orthogonal directions. The central portion of the armature-field winding support structure may be made of electrically conductive material to provide a flux shield and dissipate heat. For additional ventilation, cooling ports may be provided in the central portion of the spool-like support which cooperate with extended recesses in a coaxial rotor.

Abstract: A rotation detecting apparatus disposed on the outer periphery of a compressor including an airtight casing containing a rotor. The rotation detecting apparatus is constituted by plural magnetism detecting elements attached to the outer periphery of the airtight casing of the compressor in correspondence with a rotational orbit of a magnet disposed on the rotor within the airtight casing, such plural magnetism detecting elements each having a core made up of at least one amorphous alloy wire and a coil wound around the outer periphery of the core.

Abstract: A full flux reversal variable reluctance machine is disclosed. The stator includes a plurality of poles and electrical windings surrounding a portion of the stator. The rotor comprises main and shunt components that have alternate sections of high and low magnetic permeability. The shunt and main components are magnetically isolated, and the sections of high and low magnetic permeability for one component are complementary to the sections on the other component. Variations in flux magnitude and direction are induced in the stator without reversing the flux direction in the rotor.

Abstract: A variable reluctance motor fed by D.C. pulses is controlled by a rotation sensor. The motor has at least two phases. The stator is designed as a continuous magnetic circuit with two stator poles per phase. The stator poles for the different phases are arranged in sequence along the periphery of the rotor so that each pole adjoins poles pertaining to another phase, and such that diametrically opposed poles pertain to the same phase, each stator pole having at least two teeth per stator pole. The rotor is provided with teeth that cooperate with the stator teeth. The spaces between adjacent stator poles are shorter than the spaces between the teeth of any one stator pole.

Abstract: This rotational position detection device comprises a stator section including primary and secondary windings and a rotor section disposed in such a manner that it is capable of performing relative rotational displacement with respect to the stator section. A conductive substance portion is provided in the form of a predetermined pattern. The amount of flux passing through the conductive substance portion of the rotor section changes in accordance with a relative rotational position of the rotor section with respect to the stator section and therefore an eddy current flows through the conductive substance portion. Reluctance is caused to change by a loss due to this eddy current and a secondary output signal corresponding to the rotational position is produced in the windings of the stator section. The pattern of the conductive substance portion can be formed easily by using electro-plating or other surface processing technique.

Abstract: The pole members of each phase of a synchro have quadrifilar windings wherein each conductor is wound over six poles associated with a given phase. A voltage signal from an alternating current source is impressed across one conductor from each phase connected in series. The remaining conductors are connected to produce resolver-based Rsin.theta. and Rcos.theta. signals directly from the synchro without conversion from the normal three 120.degree. out-of-phase signals.

Abstract: The present invention contemplates a preferred position for mounting an antilock control system that uses a single wheel speed sensor. The wheel speed sensor is mounted to sense speed of rotation of the main differential gear in a differential gear assembly and generates a wheel speed signal indicative of the average rate of rotation of at least two wheels of the vehicle. The sensing point is beyond the final reduction in gear ratios so as to eliminate any need to accommodate different axle ratios. The preferred mounting position also reduces velocity fluctuations caused by oscillations of the truck driveline. A microprocessor controller is mounted in close proximity to the wheel speed sensor so as to minimize the length of sensor leads and, hence, the susceptibility of the antilock controller to electromagnetic interference.

Abstract: A noncontact rotary position sensor for measuring the rotary position of a shaft includes an annular magnetic member mounted for rotation with the shaft and a Hall effect device spaced from the shaft. The annular magnetic member includes a magnetic pole pair radially oriented. The magnetic field produced radially outwardly from the annular magnetic member is monopolar. In one embodiment, the annular magnetic member is circular and produces a magnetic field having a uniform magnetic flux density around its entire circumference at equidistant locations extending radially outwardly of the annular magnetic member and the annular magnetic member is mounted eccentric with respect to the shaft.

Abstract: Electrically-energized salient stator poles of a variable reluctance motor terminate in stator teeth that oppose the rotor on a rotor surface. Permanent magnets located between adjacent stator teeth, and magnetized transverse to the stator to rotor gap, enhance the motor torque relative to the applied excitation in ampere-turns. Permanent magnets on the rotor are avoided by reversing the magnetization of the permanent magnets from pole to pole and energizing the pole windings to oppose the magnets in four phases 1 1 0 0, 0 1 1 0, 0 0 1 1, 1 0 0 1 during successive steps. In one embodiment, a linear motor utilizes the system by replacing the rotor with a linear actuator.

Abstract: The invention is directed to an ignition arrangement for an internal combustion engine of a handheld portable tool such as a chain saw or the like. The engine has a crankshaft and a fan wheel is seated on the crankshaft for rotation therewith. The ignition arrangement includes a permanent magnet. The magnet has two pole shoes and an exciter coil is mounted on the permanent magnet. The permanent magnet equipped in this way is fixedly mounted on the tool to save weight. A relatively light self-supporting annular member with projections is mounted in the fan wheel. The projections of the annular member and the permanent magnet with its pole shoes conjointly define a magnetic circuit. As the projections pass the pole shoes at a minimal spacing therefrom during operation of the engine, the projections alternately open and close the magnetic circuit thereby causing changes in the flux of this circuit.

Abstract: A variable reluctance magnetic speed sensor senses the speed of a rotating gear (12). A ferrous outer cylindrical shell (22) extends axially and has a magnet (14) at one axial end and a coil (16) at the other axial end. An inner pole piece (4) in the coil (16) directs magnetic flux across a gap to the gear teeth (10), which flux is returned by the outer pole piece shell (22) to the magnet (14). Particular pole piece gap spacings are disclosed together with various pole piece constructions.

Abstract: In a two-phase salient pole variable reluctance motor in which the number of stator poles is four or a multiple of four, alternate stator poles carry windings of different phases and each stator pole has an elongated pole shoe, so that the pole tips of each adjacent pair of stator poles are closely spaced. Each rotor pole has an iron depletion layer in the vicinity of its poleface surface which defines a saturating zone, across which the greater part of the magnetomotive force produced by stator windings is developed by uniform flux build-up with rotor angle throughout almost the entire duration of pole overlap. A working stroke approximating a stator pole pitch is achieved.

Abstract: A built-in wheel speed sensor structure having an internal gear-like sensor rotor integrally fixed to a tire and an electromagnetic car speed sensor fitted to an inner portion of a parking brake and facing the sensor rotor. The wheel speed sensor is supported by an anchor pin of the drum brake so that the sensor rotor may be positioned away from service holes for fastening bolts which have been bored into a brake drum.

Abstract: An engine is composed of an exhaust turbine rotatable by the exhaust energy of an exhaust gas discharged from the engine, a generator coupled to the exhaust turbine, and a motor drivable by the generator. The energy recovered from the exhaust gas by the exhaust turbine is fed back to an output shaft of the engine through the generator and the motor. The engine may have a second exhaust turbine located downstream of the first-mentioned exhaust turbine in an exhaust passage for driving an intake air compressor. The exhaust gas may be introduced directly into the second exhaust turbine by a bypass passage. In a generator device used with the engine, the generator includes a rotor shaft coupled coaxially with a turbine wheel shaft of the exhaust turbine. The turbine wheel, the wheel shaft, and the rotor shaft are constructed of ceramics preferably as an integral structure. The rotor shaft is rotatably supported by oil floating bearings.

Abstract: A permanent magnet type stepping motor wherein number of magnetic poles provided radially on the inside periphery of a stator is 16, number of pole teeth provided on a rotor poles is (z) (wherein z=16 m.+-.4; (m) denotes a positive integer), 14 poles among 16 have pitch of (22.5.-+.45/z).degree. between their own pole teeth and corresponding pole teeth of adjacent poles and other two poles have pitch of (22.5.+-.315/z).degree. between their own pole teeth and corresponding pole teeth of adjacent poles.

Abstract: A drive system includes a reluctance motor, driving a load. The motor has stator and rotor poles and magnetizing windings for each stator pole. The airgap is small so that saturation occurs during pole overlap, and the poles are constructed so that there is torque overlap between phases as successive phases are energized during rotor rotation. A sensor provides a rotor position input to a reference waveform generator. The output of the generator is determined by rotor position and is applied to a power converter through a current controller. Accordingly the waveform generator establishes a relative magnitude for motor phase current for every position of the rotor during the period of energization of a motor phase. A further input may be applied to the system to determine the absolute magnitude of the phase current, subject to the waveform pattern established by the generator.

Abstract: The apparatus comprises an auxiliary pushbutton control for delivering insulin doses ahead of meals, an electric motor for producing a minimal angular advance movement of the administering syringe plunger pusher and programmable circuitry for multiplexing the minimal advance movements and providing programmed sequences of the multiplexed minimal advance movements at each operation of the pushbutton control.

Abstract: A magnetic structure including a stator including sensor windings and a field exciter, and a movable armature having a variety of applications, including a synchro resolver and a tachometer. The stator comprises a plurality of planes of oppositely polarized parallel magnetic pole pieces contained in an annular or toroidal structure of rectangular cross-section to circumferentially surround the movable rotor or armature. The parallel pole pieces of opposite polarity form a segment extending radially inward, and are surrounded by a plurality of sense windings, wherein the rotor selectively provides a relatively low reluctance path to one or more of the pole pieces, causing a change in flux and corresponding voltage to be produced in the sense windings. In one embodiment, the pole pieces are energized by a permanent magnet located in the stator to produce a tachometer output voltage upon the sense windings. In that configuration the sense winding signals vary in amplitude according to velocity and position.

Abstract: A device for monitoring the circumferential speed of a toothed disc (1) capable of being rotated, with a sensor (4) arranged at a defined distance (s) from the toothed rim (2) of the toothed disc (1) and with a sensor casing (7) supported at and securable to a stationay guide member. In order to avoid the need of any additional adjustment of the distance (s) in the event of remounting the sensor (4), a bushing (9) is provided as a guide member which is adapted to be fastened to a carrier element (14) by screw means and which projects into a bore (8) of the casing (7). To arrange a threaded bore (15) in the casing (7), the bore (15) is adapted to accommodate a screw (16) into contact with the bushing (9).

Abstract: A magnetic probe for sensing the passage of a moving magnetic element, comprising a radially magnetized cylindrical permanent magnet, formed of a flat sheet of elastomer bonded ferrite material magnetized across its smallest dimension and curled to cylindrical configuration, or formed in cup-shaped configuration. A magnetic collector core is mounted co-axially in one end of the magnet cylinder and has an axial pole piece of reduced diameter projecting to the other end of the magnet cylinder, and an electrical sensor coil encompasses the pole piece; the sub-assembly comprising the magnet, the core, and the coil is mounted in a cylindrical magnetic housing, with only high-reluctance flux paths between the inner surface of the permanent magnet and the housing.