Abstract: A motor capable of generating an electric signal having a particular and precise frequency may be used in a rotary magnetic head apparatus for a video tape recorder. A wiring pattern for generating the signal is disposed on a stator opposite a rotor. Alternating magnetic flux provided by movement of the rotor produces the signal. Gaps in the wiring pattern allow the wiring pattern and wiring for iron core assemblies also disposed on the stator to be disposed on a single circuit board. A toroidal coupling line and a loop coupling line close the loop without crossing the gaps.

Abstract: An induction motor rotor particularly for x-ray tube applications comprises a series of hollow cylinders fitting concentrically on each other and on a motor shaft. The first cylinder is a highly heat resistant and electrically insulating material. The next cylinder is a highly magnetic material cylinder fitting on the first cylinder. The next and outermost cylinder is an electrically conductive material providing the armature conductor of the induction motor rotor.

Abstract: The sensor 20a has first and second permanent magnets 31, 32, stator 33 and coil 24. The first and second permanent magnets 31, 32 has an inner peripheral face formed with south and north poles circumferentially and alternately with a uniform space therebetween. Holes 17a, 17b are formed circumferentially with a uniform space therebetween in the tone wheel 13. At the moment when all the south poles in the first permanent magnet 31 are opposed to the holes 17a, all the north poles of the second permanent magnets 32 are opposed to the holes 17b, resulting in that the alternating magnetic flux flows in the stator 33 and the electric voltage is generated alternately in opposite directions in the coil 24 as the tone wheel 13 rotates.

Abstract: A brushless resolver having a stator and a rotor, and a resolver part axially displaced to one another and a transformer part and having associated windings is provided. An additional short-circuited winding arranged parallel with the transformer rotor winding with few turns on the iron core thereof is also provided. A lowpass filter is thereby formed, which compensates the unwanted frequency-dependent phase displacement between the input voltage and the output voltages for the respective frequency.

Abstract: An electrical generator has a plurality of C-shaped stator members which are made of magnetically permeable material. Each C-shaped stator member includes a respective stator winding, and the stator members are positioned such that the ends of the members form first and second planar rings of equal diameter to establish a gap therebetween. A flat, ring-shaped rotor defines a periphery, and a plurality of permanent magnets are positioned around the periphery. The rotor is positioned with the magnets of the rotor disposed in the gap defined by the stator members. Consequently, when the rotor is rotated by a prime mover to move the magnets through the gap, an electrical current is induced in the stator windings.

Abstract: A pulse generating wheel, combined with a radial shaft sealing ring, for a machine element that can rotate about an axis. The pulse generating wheel has a cylindrical sleeve that can be slid onto the machine element. The radial shaft sealing ring is provided with a sealing lip, made of polymer material, that is delimited on the side facing the atmosphere by a conical surface. In a first axial position of the cylindrical sleeve, the conical surface is contacted by the cylindrical sleeve and can be expanded in the radial direction. The cylindrical sleeve can be displaced out of the first axial position into a second axial position in which the sealing lip moves into direct contact with the machine element, and the cylindrical sleeve is at an axial distance from the conical surface.

Abstract: An apparatus for sensing the relative rotational position between a stator (28) and a rotor (32) in a variable reluctance motor (26) includes a transmitting ring (40) mounted to the rotor (32) and having a transmitting coil (46) mounted thereon. A receiving ring (42) is mounted to stator (46) and has a receiving coil (56) mounted thereon. The receiving coil includes three conductor patterns (56a, 56b, 56c) having the same shape, each of said conductor patterns being electrically insulated from each other, and each conductor pattern being offset from adjacent conductor patterns by 120 electrical degrees. A drive signal is coupled to the transmitting coil. The apparatus further includes a controller (76) for monitoring the outputs from the receiving coil patterns and for determining the relative rotation between the rotor and the stator from the monitored outputs. The receiving coil patterns are each arranged in a circumferentially varying square wave pattern.

Abstract: An apparatus for sensing the relative rotational position between first and second relatively rotatable members includes a transmitter disk having a planar surface and being mountable to the first member so that the planar surface of the transmitter disk is substantially perpendicular the an axis of rotation of the first and second members. The transmitter disk has a conductive material mounted to the planar surface in a circular pattern with a sinusoidal diameter. A receiving disk having a planar surface and is mountable to the second member so that the planar surface of the transmitter disk is substantially perpendicular the an axis of rotation of the first and second members. The receiving disk has a conductive material mounted thereon and arranged in a circular pattern with a squarewave diameter so as to receive a signal from the transmitter disk and output a signal indicative of the relative rotational position of the first and second members.

Abstract: A tachogenerator for speed control of an electric motor including a stator and a rotor. A multipole permanent magnet is connected to the rotor and has at least a pair of magnetic poles, with the pole centers of the magnetic poles being uniformly arranged on a circle of a predetermined diameter. A wave winding is connected to the stator and separated from the magnet by an air gap having a width. The wave winding having angular repeat units of the wave winding equal to from 0.5 to 1.5 times a ratio of the diameter divided by the width.

Abstract: A servo controlled motor has an annular coil arrangement with meander-shaped windings and an annular arrangement of magnetic pole pairs, positioned for concentric relative rotation. A first coil is formed by a first number of the windings aligned at a first angle and with consistent pitch relative to a diameter line. A first number of pole pairs are aligned at the first angle and correspond in number and pitch to the first number of windings. A second coil is formed by a second number of windings. The second number of windings is aligned at a second angle relative to the diameter line. A second number of the pole pairs are aligned at the second angle and correspond in number and pitch to the second number of windings. Voltages are induced in the second coil by the second, but not by the first, number of pole pairs. Alternatively, the first number of windings define a grid of winding positions. A second coil is formed by a second number of windings aligned at the first angle.

Abstract: A miniature motor having a frequency generator comprising a miniature motor consisting of a stator equipped with a permanent magnet for forming a magnetic field, and a rotor having windings wound on a rotor core, constructed so as to feed electric current to the rotor windings through a commutator which makes sliding contact with current-feeding brushes held by a brush holder fixedly fitted to a small motor case. A frequency generator is provided consisting of a rotor for detecting revolution, a stator disposed in such a manner as to face the rotor, a permanent magnet for forming a magnetic field between the rotor and the stator, and a frequency-detecting coil generating an induced voltage proportional to the revolution of the rotor.

Abstract: A miniature motor with a frequency generator comprising a motor portion having a stator with a permanent magnet for forming a magnetic field and a rotor with rotor windings wound on a rotor core; electric current being fed to the rotor windings via a commutator making sliding contact with brushes, and a frequency generator for detecting the revolution of the motor, in which the frequency generator comprises a frequency generator rotor, mounted on the motor rotor, having a disc-like rotor portion made of a soft magnetic material and equipped with a plurality of magnetic-pole teeth on the outer periphery thereof, an internal-gear core of an annular disc shape, made of a soft magnetic material, disposed in such a manner as to come in contact with the inside of a motor housing and face the outer circumferential surface of the rotor portion and equipped with a plurality of magnetic-pole teeth on the inner periphery thereof, a permanent magnet forming a magnetic field between the magnetic-pole teeth of the rotor po

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: A multiple rotational position sensor includes a stator winding provided to a stator mounted to a casing and a rotor having a rotor winding provided to a rotor shaft mounted for rotation to the casing, in which the rotational position is sensed by the relative rotation between the rotor and the stator. According to the present invention, the sensor also includes a speed reducing unit for coupling the rotor shaft and the casing together and outer bearings for rotatably carrying the casing, which is revolved by rotation of the rotor shaft by an angle less than the angle of rotation of the rotor shaft.

Abstract: A collectorless DC motor with a horizontal air gap, particularly a low-speed motor for a direct drive of recording and/or reproducing devices has its rotor axle supported within an axial bore of the motor housing, with the motor housing made of plastic. A tachogenerator is disposed about the inner cylinder formed by the rotating permanent magnet ring of the motor. The stator winding and the magnetic return structure are fixedly arranged on the motor housing, which is also provided with bores for attaching the motor or installing it into the device. Obviating of machining sequences, simplification of assembly and direct support of the rotor axle in the motor housing all contribute to a reduction in manufacturing cost.

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: Lighting device for a vehicle moving without an engine and on wheels, such as bicycle and tricycle, comprising two lights supplied from a generator (1) comprising a stator and a rotor drivable by a vehicle wheel through projecting members (34) cooperating with the spokes (34) from said wheel, said generator (1) comprising at least sixteen heteropolar poles (27) distributed over 360.degree. facing an induction winding formed by a single coil (26) also extending over 360.degree., said poles (27) and coil (26) being movably mounted relative to one another, and the stator being so fastened to a vehicle fork (23) that the generator (1) be co-axial with the axis (21) of that wheel driving the rotor.

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: An electric motor with attached tachogenerator wherein the tachogenerator may be attached to electric motors of varying types without significantly changing the housing or motor shaft bearing plate configuration and while maintaining the required environmental protection. The rpm signal generator of the tachogenerator is placed onto a motor shaft end portion which extends out of the motor housing through the shaft bearing plate and is enclosed by a closable housing accommodating a detector, e.g. a coil. The housing is latchable, for example by means of detent hooks, to the bearing plate or motor housing. The arrangement is particularly useful for electric motors where dust free and liquid tight protection is required.

Abstract: A Brushless motor with phase advance has a rotor having magnetic poll teeth, a stator having plural coils and facing the rotor across a gap, and a bearing for rotatably supporting the rotor. A position sensor is mounted on the stator and detects variations in the position of the rotor and converts said variations into an electrical signal which issues as a polyphase positional signal having an approximate sine-wave shape. A velocity detecting device converts the positional signal into a velocity signal. Electronic switching apparatus receives a step advance instruction signal from outside the motor and selects the polyphase positional signal corresponding to the step advance instruction signal. Phase advance circuitry advances the phase of the positional signal by using a sum of the velocity and the selected positional signal as the phase advance amount.

Abstract: A rotor for a techo-generator having an integral, massive disk that is toothed at the outer circumference. The width of the grooves between the teeth is larger than the width of the teeth so that the rotor windings may be wound in one plane without any baffle plates, deflecting plates or the like.

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: An alternator of the single-phase type in particular is composed of an armature (1) provided with at least one winding (2) and an inductor (3) comprising on the one hand a magnetic circuit (4) having at least one pair of poles (5) with lateral pole shoes (6) and on the other hand at least one excitation winding (2) formed around said magnetic circuit (4), the inductor (3) and armature (1) being rotatable with respect to each other. At least one pole (5) is provided in the vicinity of at least one pole shoe (6) with a slot (9) occupied by a corrector winding (8) which embraces the pole shoe (6) and is connected electrically so as to permit the flow of substantially direct current through the corrector winding during service.

Abstract: A rotational position transducer comprising a rotor having annularly spaced teeth and a stator with a pole face configuration comprising annularly spaced teeth opposing the rotor teeth. One or more pole windings are energized by an alternate current source, and one or more output voltages induced in pole windings are produced with components having a characteristic which varies as a function of the angular position of the rotor relative to the stator. The output voltages may be either amplitude or phase modulated as a function of rotor position. The transducer may be combined with a stepping motor having an identical pole configuration.

Abstract: A low cost, linear, low impedance tachometer/generator includes a stator and a rotor. The rotor includes a plurality of magnetic poles which alternate between first and second polarities, and the stator includes a plurality of first and second annular sets of planar laminated poles which are spaced apart, with the first set of poles having a first polarity and the second set of poles having a second polarity. An annular coil is disposed between the first and second sets of poles. The first set of poles is axially spaced apart and circumferentially offset one pole pitch about the axis of rotation from the second set of poles to effect simultaneous periodic alignment of the first set of poles on the stator with the plurality of poles on the rotor of the second polarity and the second set of poles on the stator with the plurality of poles on the rotor of the first polarity.

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: In a flat housing (10) a stator (12) is concentrically arranged relative to an input shaft (16) supported in the housing (10). A rotor (14) is seated on the input shaft (16). A reducing gear (18) constructed as a play-free planetary gear is arranged within the flat housing (10) in an annular space (20) formed between the rotor (14) and the input shaft (16). The signal processing circuit is also accommodated in an annular space (60) within the housing (10). The input shaft (16) can be rotated through 360.degree. or more. During such rotation, the rotor (14) performs a rotational movement through a limited angle within which there is obtained a substantially linear angle signal due to the cooperation of the rotor (14) and the stator (12).

Abstract: In a brushless motor, a magnetizing member for rotation driving with N-poles and S-poles arranged alternately is formed on a flat plane portion of a rotor magnet, and a member for detecting the rotational speed with N-poles and S-poles arranged alternately at a smaller pitch and a magnetizing member for detecting the rotational position arranged at a spacing angle of 180.degree. are formed on a circumferential surface of the rotor magnet. Stator coils are located opposite the magnetizing member for rotation driving, and a detecting substrate surrounds the outer circumference of the rotor magnet. The detecting substrate is provided with a rotational speed detecting pattern (FG) and a rotational position detecting pattern (PG), and a pair of lead patterns are connected to both ends of the rotational speed detecting pattern and inclined with respect to the rotational direction, so as to cancel distorting signals from the position poles.

Abstract: In a brushless motor, a rotor magnet is rotatably supported and comprises a main magnetizing member for rotation driving with N-poles and S-poles alternately arranged, and a subsidiary magnetizing member for detecting the rotatonal speed with N-poles and S-poles alternately arranged at smaller pitch than that of the main magnetizing member. A stationary plate is provided with stator coils opposed to the main magnetizing member for rotation driving and a detecting substrate having a pattern in opposition to the subsidiary magnetizing member. A pair of leads connected to the pattern of the detecting substrate are arranged at the same angle as the angular interval of two consecutive magnetic poles with the same polarity in the main magnetizing member for rotation driving or at an angle corresponding to an integer multiple of the angular interval. This results in phase cancellation of distorting signals from the driving poles.

Abstract: A method of producing a permanent magnet in which a material containing ferromagnetic powder is molded into a columnar or cylindrical molded body through injection molding, compression molding, or the like, in a magnetic field capable of orienting and magnetizing the ferromagnetic powder. The method comprises the steps of applying a magnetic field to the molded body in the unidirection perpendicular to an axis of rotation of the molded body to orient and magnetize the molded body so as to have two magnetic poles of N and S; demagnetizing the magnetized molded body; and divisionally remagnetizing the demagnetized molded body on its outer or inner surface to form at least two stripes of N and S poles arranged alternately and extending parallel to the axis of rotation of the molded body.

Abstract: The stator of the tacho-generator is assembled of a pack of sheet steel lamellae defining an annular yoke portion and inwardly projecting poles for stator windings. The yoke portions of the pack are formed with an axially directed cutout for accommodating circuit elements of the tacho-generator.

Abstract: A tape driving capstan comprises a hollow post (39) a capstan member (36) and a rotor (57,58) which extends radially of the capstan member within a housing (49). The rotor carries permanent magnets (59) and a stator winding (66) is disposed within the confines of the rotor.

Abstract: The motor housing comprises a cup-shaped ferromagnetic part having an open end and an axial end plate of ferromagnetic material closing off the open end to form a motor housing of rectangular cross-section when viewed in longitudinal section. A generally disk-shaped rpm-signal generating structure is mounted interiorly of the motor housing, coaxial with the rotor axis, at one axial end of the housing, and just inward of a wall of the motor housing which forms part of the flux-conducting magnet system of the motor, whereby such wall shields the rpm-signal generating structure at least against electromagnetic interference originating exteriorly of the motor housing. The motor comprises slip rings or commutator segments on whose surfaces stationary brushes ride.

Abstract: A tachometer assembly is provided for use with electrical rotary magnetic motors. The assembly includes a conventional brushless DC motor (12) having a radially polarized main field ring magnet (24) forming the rotor (16) about a stator (18). The tachometer portion includes a commutator ring magnet (26) formed on one edge of the main field magnet (24) and an axially displaced circuit board (14) including one or more unbranched conducting traces (40). The commutator ring (26) includes a plurality of alternately axially polarized segments (27) which induce sinusoidal signals in the conductive traces (40) as the rotor (16) is rotated with respect to the circuit board (14). The tachometer assembly is utilized to generate rotational velocity and analog positional data for manipulation and control of the motor (12). The primary uses are in servo control mechanisms in the data processing and computer peripheral industries.

Abstract: A brushless DC tachometer is disclosed that includes a high strength toroidal permanent magnet (25) for providing a uniform magnetic field in an air gap, an annular pole piece (21) opposite the magnet, and a pickup coil (19) wound around the pole piece (21) and rotating about the axis of the pole piece. The pickup coil is rotated by an input shaft (15) to which the coil (19) is coupled with a friction clip. The output of the coil (19) is conducted to circuitry (31) by a twisted wire pair (29). The input shaft (15) also activates a position transducing potentiometer (13).

Abstract: The invention relates to a low current, low voltage generator for use in an underwater lighting system. The generator is driven by a commercially available source of power, for example, house current. The generator consists of an AC motor having an output shaft and a magnet mounted on the shaft for rotation therewith. A coil arrangement is disposed in a plane parallel with but spaced from the plane of the magnet. The magnet is cylindrical in shape and includes a slot in the front face which faces the coil arrangement. Thus, when the magnet is rotated, it produces an EMF in the coil arrangement to provide a low current low voltage AC output at the output of the coil arrangement, which can be rectified to provide a DC output if required.

Abstract: A multipolar resolver is so constructed that the need of the conventionally indispensable coil on the resolver rotor is eliminated by providing a center coil on a stator, and 5n or 3n rotor poles and 4n stator poles are provided where n is a positive integer. Sine and consine coils are wound on the stator poles alternately, thus simplifying the construction of the multipolar resolver.

Abstract: A dynamoelectric machine for generating an electric current having the frequency thereof proportional to the shaft speed of the machine. The generator is preferably of the permanent magnet type particularly suitable for use as a wheel speed indicator or tachometer-generator. The stator has an inner and outer tubular portion, with the inner portion disposed for limited radial movement with respect to the outer housing and having one end of the rotor journalled thereon for holding a substantially constant air gap at the rotary pole thereof. The limited movement of the inner stator portion is resisted by frictional forces created by the permanent magnet and by the axial bias of a thrust bearing. The remaining end of the rotor is journalled in a bearing registered in the outer stator housing. The machine gives magnetic saturation at the stator poles at 30% of rated speed and produces a strong signal output at low speeds.

Abstract: A transducer to monitor velocity and direction of movement having a magnetic core with at least three spaced apart poles. Two of the poles include coils which are wired series aiding for connection to an input alternating voltage, which upon current flow create a magnetic field intersecting the path of movement of an object being monitored. The third pole includes a coil in which an alternating output voltage is induced when the monitored object moves. The magnitude of such output voltage varies with the rate of speed of the monitored object. The phase relationship of output voltage to input voltage varies with the direction in which the monitored object moves. The coil in the third pole is connected to responsive means to receive the output signal and control, or indicate, the speed as well as the direction of movement of the monitored object.

Abstract: A multi-phase generator without slip rings and brushes and with no windings in its rotor has in its stator an exciting winding and an alternating current winding, mutually displaced half a stator pole pitch. The generator has an additional alternating current winding having a coil pitch about half that one of the original alternating current winding. The additional winding has a coil in each stator pole surface disposed in slots symmetrical in relation to a central slot for the original alternating current winding. For each phase two oppositely disposed coils of each set of alternating current windings, said sets being displaced 90.degree. (mechanical), are connected in series.