Abstract: A rotary electric motor comprises a rotor having a plurality of permanent magnet elements disposed in an annular ring configuration about an axis of rotation, the magnet elements successively alternating in magnetic polarity along an inner annular surface, and a stator spaced from the rotor by a radial air gap. The stator includes a plurality of magnetic core segments having respective coils wound thereon to form stator windings, the core segments separated from direct contact with each other and disposed along the radial air gap. Each stator segment comprises a pair of poles aligned with each other in a direction parallel to the axis of rotation. Thus the stator comprises a first set of stator poles in radial alignment and an axially displaced second set of stator poles in radial alignment.

Abstract: A roller-type electric motor includes a housing having a hollow interior and an inner wall. A plurality of stator poles each of predetermined magnetic polarity are positioned at the inner wall of the housing, and a roller having an outer surface is positioned for rolling movement within said hollow interior of the housing. A plurality of roller poles each of predetermined magnetic polarity are positioned on the outer surface of the roller so that a first one of the roller poles has a magnetic polarity opposite the magnetic polarity of a first one of the stator poles so that the first roller pole is drawn through magnetic action into contact with the first stator pole.

Abstract: The present invention is a double sleeve type fluid dynamic pressure bearing, comprising a fixed shaft having respective ends to be fixed to a utilized apparatus; a rotary sleeve arranged to provide a first fine gap between an inner peripheral surface thereof and an outer peripheral surface of the fixed shaft, a fixed sleeve arranged to provide a second fine gap between an inner peripheral surface thereof and an outer peripheral surface of the rotary sleeve, a holder member arranged to cooperate with a lower end surface of the rotary sleeve to provide a third gap, and wherein the first fine gap and the second fine gap are formed with radial dynamic pressure producing grooves while the third fine gap is formed with a thrust dynamic pressure producing groove, the first, second and third fine gaps being filled with lubrication oil, the first fine gap and the second fine gap having one ends made as opening ends contacting with the air and the other ends made as closed ends communicated with each other through the

Abstract: An electrical machine (10), in particular a generator, comprises a rotor (12) with pole zones, in which pole zones amortisseur bars (15) designed as wedges are arranged, which amortisseur bars (15), on the outside of the rotor (12), are pushed into slots (14) provided for this purpose and running in the longitudinal direction and are held in the slots (14) by supporting means (28) against the centrifugal forces occurring during rapid rotation of the rotor (12) and which are connected to one another in an electrically conductive manner at the ends of the rotor (12) by an amortisseur ring (18) or amortisseur segments (17), which enclose the rotor (12) in an annular or ring-section-shaped manner.

Abstract: An electric motor includes a plurality of coils through which passes a ring rotor having a plurality of magnets supported thereon. The magnets are arranged about the ring rotor to be equidistant from an axis of rotation coinciding with the motor output shaft. The polarity of the magnets are alternated with North poles of adjacent magnets facing toward or against the direction of rotation of the rotor. The position of the rotor is detected and correspondingly electrical energy is applied to the coils to induce electro-magnetic fields which couple and superimpose with the magnetic fields of the permanent magnets. When the electrical energy is alternated between a certain voltage level and its inverse, each coil is able to simultaneously attract and repel adjacent magnets, thereby causing rotational movement of the rotor. The coils may be formed with superconducting materials and enclosed so that they may be cooled to superconducting temperatures. Other features to improve motor efficiency are shown.

Abstract: Device for forming a leno selvedge with an electric motor comprising a rotor (1; 200) and a stator casing (10) accommodating the rotor, whereas the rotor is provided with at least two guiding apertures (3; 216, 216b) for the doup ends and whereas the rotor (1, 200) is provided with several magnetic poles oriented in axial direction, the rotor (1; 200) being provided with two spaced magnetic rings (210, 220) arranged in radial direction, the magnetic rings (210, 220) being provided with several magnet segments (2; 211, 212; 221, 222) each, the magnet segments (2; 211, 212) of the one magnetic ring (2; 210) being locally offset relative to those of the other magnetic ring (2; 210, 220), whereas the rotor (1; 100) is received on both sides in axial direction by the stator casing (10; 225), whereas the stator casing (10; 225) is provided with iron cores (11; 230, 240) with appropriate windings (12; 250), the ends of which being oriented toward the magnetic poles of the rotor.

Abstract: The present invention relates to a spindle motor mainly used for an apparatus for driving a disc, which can increase the capacity of recorded information and the information transmission speed while reducing the size and thickness of the apparatus. This spindle motor corrects the balance of a structurally unbalanced chucking portion, and reduces the shaft deflection of a motor, non-uniform rotations, the inclination of a disc relative to a head, and the surface deflection of a disc loading portion.

Abstract: A brushless DC motor, whose stator (10) is a combination of stator yokes (11, 16). a bobbin (14) on which a magnetic field coil (15) is wound and to which terminal pins are provided, and a base plate (20). The stator (10) is fixed to the base plate (20) by a protrusion (12c) provided on the bobbin (14) or by a flange (18a) formed on a bearing. The widths of magnetic poles (11a, 16a) of the stator, which are measured in the circumferential direction of the stator, are smaller than the width of one of the poles of a rotor magnet (5). Thereby, the position of a stable point is a maximum excitation torque position. Further, a magnetic pole sensing element (21) is provided at a place which is shifted in the circumferential direction from the middle position of one of the magnetic poles of the rotor magnet (5).

Abstract: A motor includes a rotor including a permanent magnet circumferentially equally divided and alternately magnetized to different poles into a cylindrical shape. A first coil and a second coil are displayed inside and axially of the rotor. First outer magnetic poles and first inner magnetic poles are excited by the first coil and are opposed to the outer peripheral surface and inner peripheral surface of the rotor, respectively. Second outer magnetic poles and second inner magnetic poles excited by the second coil are opposed to the outer peripheral surface and inner peripheral surface of the rotor, respectively. The first inner magnetic poles and the second inner magnetic poles are located between the first coil and the second coil, to thereby make the opposed area of the outer magnetic poles, the inner magnetic poles and the magnet large and provide a super-compact motor of a high output and high efficiency.

Abstract: In the embodiments described in the specification, a stator for an electric motor has an outer ring member made of resin material and supported from a frame by stator caps and a flanged inner composite ring member made of resin material which receives a steel band. Laminations and coil windings are mounted inside the steel band and an outer wrap of resin material encapsulates the steel band, laminations and coil windings. A rotor arrangement includes a steel hub surrounded by a disk-shaped member made of resin material and having inner and outer rings connected by radial arms. A non-ferromagnetic steel band surrounds the peripheral surface of the disk-shaped member and laminations and magnets or coil windings are positioned on the band and are encapsulated by an outer wrap of resin material.

Abstract: An electrical generator having a keyway for a retaining ring key formed in only the pole portion of the rotor and not in the tooth region of the rotor, and a method of repairing an electrical generator by forming such a keyway. The present invention lengthens the operating life of the rotor by eliminating a stress-concentrating discontinuity and by reducing the loads in the highly stressed tooth region of the rotor.

Abstract: An electromagnetic machine, for using electrical energy to generate a propulsive force, includes an inertia ring disposed within an outer casing. The inertia ring can rotate freely relative to the outer casing. The outer casing supports a pair of primary coils. The inertia ring carries a plurality of secondary magnetic coils thereon. There is a pair of brushes that energizes the secondary magnetic coils on either side of each of the primary coils, as the secondary coils move past the pairs of brushes. The primary coils are energized to attract the secondary coils on one side thereof while repelling the secondary coils on the other side thereof to thereby impart rotational movement to the inertia ring relative to the outer casing.

Abstract: A power device including a magneto and a rectification circuit for rectifying an output of the magneto is provided which is capable of adjusting an output of the magneto without any specific control circuit. A field adjusting excitation coil is arranged on a side of a stator of the magneto so as to generate a field adjusting magnetic flux when it is excited, resulting in a magnet field of the magneto being varied by means of the magnetic flux. The field adjusting excitation coil is connected to an intermediate portion of a current flow circuit for a load current, to thereby be excited by the load current, so that a magnet field of a rotor of the magneto is varied depending on the load current, leading to adjustment of an output of the magneto.

Abstract: A motor rotor 10 is formed as follows: First, in a first forging step, a hum manufacturing primary block 6A is formed. Next, a second forging step B is effected to form the primary blank 6A into a secondary blank 6B. In this step, a forging die is used to secure an annular yoke 34 to the inner cylindrical surface 61a of a hub cylindrical portion 61 by punching, in such a manner that both whole edges of the annular yoke are sealingly closed thereby. In the second forging step B, by drawing the inner cylindrical surface 34a of the annular yoke, its circularity is improved. The annular yoke can be secured to the hub cylindrical portion with use of an adhesive agent. Moreover, the annular yoke can be fixed in such a manner that it is accurately coaxial with the hub cylindrical portion. In addition, the gap between the annular yoke and the hub cylindrical portion can be eliminated.

Abstract: A dynamo-electric core which has a lamination stack defining an axial bore therethrough is wrapped by a wire coil having a coil lead. A mounting member is axially movable within said axial bore between a first position and a second position. A coil lead anchoring structure is positioned adjacent an end portion of said mounting member and is axially movable with said mounting member. When the mounting member is in the first position, there is adequate space for winding apparatus and fusing apparatus for placing and securing the coil lead to the coil lead anchoring structure. When the mounting member is in the second position, the axial length of the dynamo-electric core is reduced.

Abstract: An outer-rotor type engine-operated generator is of low cost and simple construction, can be miniaturized and can leak electricity for ignition without sacrificing generator output. The engine-operated generator has a plurality of magnets arranged along an inner circumference of an outer cylindrical wall of an outer-rotor and a multipolar stator housed within the outer-rotor facing the magnets. An electricity generating section for an engine ignition device is disposed on an outside of and opposite to the outer cylindrical wall of the outer-rotor, and a through window, through which magnetic force of the magnets affects the electricity generating section, is formed in a part of the outer cylindrical wall.

Abstract: The gap tube motor comprises a rotor, a stator and a gap tube which is arranged between the rotor and the stator, with at least two bearing apparatuses being arranged with a spacing in the axial direction (A) with respect to the rotor, and with at least one of the bearing apparatuses being designed as a bearing and drive apparatus and comprising both an electrical motor drive apparatus and a magnetic bearing apparatus in order to both drive the rotor and to journal the rotor in the radial direction without contact using this bearing and drive apparatus.

Abstract: A rotor assembly for a synchronous reluctance machine has a plurality of steel punched star-shaped supports secured along a shaft at spaced locations for retaining a plurality of laminated rotor sections. The star-shaped supports have four equiangularly spaced arms having arcuate valleys disposed therebetween that define a plurality of channels for receiving the rotor sections. The rotor sections have a plurality of linearly-disposed apertures for receiving mounting members that extend radially from the valleys of the star-shaped supports. The portions of free ends of the mounting members that extend through the apertures, are stamped or formed to secure the rotor sections to the star-shaped supports. A rotor bar may be disposed within a concave cavity defined by the rotor sections to reduce audible noise produced as the rotor rotates at a high rate of speed.

Abstract: A permanent magnet rotor for an electric generator or motor has a core lamination hub formed of a stack of generally round plates with peripheral slots for holding the first end of a rectangular magnet. Each magnet has an outer end which is held by a slotted pole piece formed of laminated plates. First and second side plates overlie each side of the hub, magnets and pole pieces, and fasteners such as rivets are passed through holes in the side plates, hub plates and pole pieces to form a rigid rotor in which each rectangular magnet is supported and restrained on all six sides. A method for fabricating the rotor is also disclosed.

Abstract: An electric motor for an x-ray tube of a medical imaging system is described herein. The electric motor includes a stator and a substantially cylindrical rotor. The stator includes stator winding slots and stator windings injected into the stator winding slots. The stator also has a stator bore. The rotor is rotatably mounted within a stator bore so that the rotor is coaxial with the stator bore. The rotor includes a rotor core, a plurality of rotor bars, and end rings. The rotor bars are at located in rotor bar openings at a periphery of the rotor. At least one of the rotor bars has a different cross-sectional area than one of the other rotor bars.

Abstract: The present invention provides a light deflector which effectively cools a rotation torque generation portion, which leads to miniaturization of the apparatus and economy of electric power.

Abstract: A combination generator and starter motor includes a rotor with an internal ring gear, a plurality of dual pinion gears which mesh with the rotor and two sun gears which mesh with the dual pinion gears. A large torque multiplication from the rotor to one of the sun gears is provided when the combination generator and starter motor operates as a starter motor. A one-to-one ratio of rotation between that sun gear and the rotor is provided when the combination generator and starter motor operates as a generator.

Abstract: A brushless polyphase DC motor is applied to a spindle motor for a disk device and has a stator generating a magnetic field in an excited state and a rotor obtaining turning force by the electromagnetic interaction with the stator. When an electrical charge current is intermittently and alternately supplied to the coil of the stator in opposite directions, for example, if electrical charge is stopped after current in the normal direction is supplied, a residual magnetic field density is generated in the stator during the stopping period. The residual magnetic flux density is employed for performing electrical charge in the reverse direction by supplying current in the reverse direction. In this case, a high torque is generated by increasing a change in the magnetic flux density.

Abstract: The invention provides a spindle motor for magnetic disk devices capable of coping with small magnetic disks, in which the leaking magnetic flux in the motor section does not adversely affect the magnetic head. The spindle motor consists of a stator, a magnetic disk mounting hub axially supported on a frame of the stator, a bowl-like rotor yoke protruding from the base of the hub in the radial direction and covering the top and circumference of the stator, and a rotor magnet fitted over the inner circumference of the rotor yoke in a position opposite to the magnetic pole of the stator. A clearance space comprising is provided between a mounting seat of the magnetic disk and the top of the rotor yoke. The outer diameter of the hub base is also smaller than the information-recording region of the magnetic disk, and the rotor yoke is fitted as a magnetic body on the hub, which is made from the same material as the substrate of the magnetic disk.

Abstract: An electric motor (2) for a clothes washing machine including the motor and a drive, the motor having a stator (25) held outboard of a frame carrying bearings (37, 38) in which a shaft (11) rotates, the shaft carrying the rotor (21) outboard of the stator (25), and permanent magnets (17) on an inner face of the rotor. The stator (25) is formed as an annular helical yoke edgewise wound from a strip of magnetic material and having an inner face and an outer face, the strip having pole pieces (8) formed integrally therewith extending from one edge of the strip and the strip being edgewise wound whereby the pole pieces coincide in stacked groups to form a plurality of poles arranged at equally spaced intervals extending radially outwardly from the outer face of the yoke.

Abstract: A permanent magnet generator having a plurality of permanent magnet generator units which produce a controlled output potential by mutual magnetic flux linkage between the permanent magnet generator units to produce the controlled output potential in accordance with the invention includes a plurality of permanent magnet rotors (20 and 22) mounted on a drive shaft (26) with at least one of the rotors being rotatable with respect to the drive shaft to vary an angular position of the at least one of the rotors relative to the shaft to produce a mutual variable magnitude magnetic axial field extending parallel to the drive shaft; at least one stator (26, 28, 72) disposed at a position axially offset from the plurality of rotors which is magnetically coupled to the variable magnitude permanent magnet axially field; and a mechanism (46, 48) responsive to a stator fault for angularly positioning the rotors relative to each other so that the permanent magnetic field coupled to the at least one stator is zero.

Abstract: A step motor which comprises a stator having a winding wound therearound, a rotor rotatably provided with respect to the stator, a multiplicity of pole teeth formed on mutually opposing faces of the stator and rotor, a position detector for detecting a position of the rotor, and switching means for changing over a phase current flowing through the winding wound around the stator on the basis of a position signal indicative of the position of the rotor, wherein the pole teeth and a position detectable portion are integrally formed on a rotary yoke of the rotor and the position detectable portion is detected by the position detector.

Abstract: There is disclosed a system and method for rotationally controlling a circular structure, such as a dome, from the outer circumference of the dome. The system uses a linear stepping motor having a circular fixed section and a movable section. The movable section is attached to the rim of the dome and is in magnetic coupled contact with the fixed section. Controllable magnetic fields induced between the movable and stationary sections cause the movable section, and hence the dome, to drive around the circular fixed section. The dome speed is controlled by the magnetic fields and the position of the dome is monitored by monitoring the position of the active magnetic fields.

Abstract: A diaphragm electromagnetic drive device which comprises ring-shaped rotor and stator disposed coaxially about the optical axis of a taking lens and in which the rotor is rotated to thereby rotate diaphragm blades so as to vary successively a diaphragm diameter defined by the diaphragm blades. The mutually opposed surfaces of the rotor and stator are constructed respectively in the shape of a side surface of a truncated cone, so that the areas of the opposed surfaces can be increased without increasing the outside diameter and the length in the optical axis direction of the electromagnetic drive device.

Abstract: A rotor for a rotary electric machine having a plurality of split sectors each composed of a laminated of split sector pieces made of sector-shaped thin steel plates, arranged in one circular shape, coupled to a rotor clamping tool by the joint of the lower end of the sectors, and rotor coils inserted into the coil slots of the split sectors and connected to each other outside the split sectors.

Abstract: A transporter includes at least one elongated transporting element (1) which is made of a material capable of changing its volume in response to the application of voltage or magnetic fields thereacross. The transporting element, optionally together with a further transporting element or some other part of the transporter, defines an elongated transporting channel (7). Means are provided for generating fields in predetermined regions along the transporting element (1) and in a given order of sequence, such as to impart substantially peristaltic motion to the element. These means include at least three mutually adjacent conductors (3, 4, 5) which extend substantially helically in relation to the transporting element (1) and to which different phases of a multi-phase alternating voltage or alternating current source are applied.

Abstract: Novel winding arrangements and control circuits for brushless direct-current motors are described. Stator windings are arranged to produce an essentially continuous torque in each winding phase from D.C. current pulses each of about one-half the duration of a two-pole cycle or rotor movement. An electronic control circuit comprises one electronic power switch for each winding group or winding phase in the stator windings. One or two D.C. current pulses are applied to the windings for each two-pole cycle of rotor movement, depending on the arrangement of the coils. CEMF voltage generated in the coils is sensed and a change in the polarity thereof is used to control switching of the D.C. current between coils.

Abstract: An electrical pulse generator comprising a series of electromagnets spatially positioned about the outer circumference of a disc-like base and a second series of complimentary electromagnets positioned about an inner position on said disc. One of each of said first and second series electromagnets positioned relative to each other creating a magnetic field therebetween. A second disc-like base rotatable above and parallel with said first disc. A continuous coil winding ring mounted on the underside of said second disc and positioned relative to said first and second series of electromagnets to traverse said magnetic field upon rotation of said second disc and thereby inducing a voltage/current potential in said coil winding.

Abstract: An electromotive device which is a d.c. motor or a.c. motor, including a substantially cylindrical armature having a plurality of windings, a magnetic field of electromagnets or permanent magnets, and a casing constructed to support and maintain small air gap clearances between the armature and magnetic field. This device can be configured to provide either a stationary field commutatorless motor or a rotating magnetic field commutatorless motor. The armature is constructed to produce very small winding current magnetic flux at wide armature slot walls in comparison to winding current magnetic flux at adjacent narrow armature slot walls. The interaction of the winding current magnetic flux and the magnetic field flux induced electron motion in slot wall surfaces results in larger and oppositely directed forces at the walls of the narrow slots than at the walls of the wide slots. The net force produces a relative torque between the armature and magnetic field to drive a load attached to the motor.

Abstract: To attach a segmental stator, for example in the form of armature laminations, to the housing of a flywheel of an internal combustion engine, and permanent magnet rotor elements to the flywheel circumference, while permitting differential thermal expansion, the attachment elements include a shaft or web element (10, 210, 403, 403') which connects the respective magnetic structural component--stator laminations (1) or permanent magnet field (19)--to the engine structure housing (2) or flywheel (15), respectively, by two headed ends (8, 208, 408; 7, 207, 407) which may be in form of tapped cylindrical or spherical elements or cylindrical tubular portions fitted into holes (415) of the engine structure and expanded after placement, by driving a pin (FIG. 4c: 16) thereinto, or pulling a headed pin (FIG. 4d: 17) therethrough.

Abstract: A reel mechanism for use in a playing device comprises a DC motor having a rotor formed with an outer apron on which are displayed a plurality of substantially equally spaced symbols which are to be sequentially displayed in a visual field. The rotor rotates about the stator with the rotor having permanent magnetic poles which interact with the stator. The apron has a plurality of perforations or recesses associated with the individual symbols which are scanned by a plurality of photo-transistor scanning devices so as to generate for each symbol upon its passing of a particular position unique information scanning signals which identify each of the symbols.

Abstract: A bipolar stepping motor includes, a single stator sheet, an air gap between the ends of the stator sheet, a rotor between the ends of the stator sheet, and a coil which encompasses a portion of the stator sheet. The stator sheet is of essentially annular configuration and is surrounded over a substantial portion of its periphery by a coil carrier. The coil is applied on the carrier in the form of a ring core winding. A carrier plate is attached to the stator sheet in the vicinity of the air gap. This plate carries a shaft of the rotor and serves as means for attaching the motor to another structure.

Abstract: A cylindrical core with toroidal windings at angularly spaced locations on the core, for example, as in the stator of a brushless, slotless DC motor for a record player or tape recorder, is formed of a plurality of annular core elements each having an axial slot and initially being axially superposed with the respective slots in axial alignment. The windings are conveniently formed individually on respective bobbins which are dimensioned to pass through the axially aligned slots for installation on the superposed core elements, whereupon, the latter are preferably turned relative to each other for angularly offsetting the respective slots and thereby minimizing the turbulence of magnetic flux that can result therefrom.