Abstract: A high torque density interior permanent magnet machine for use in an appliance is provided that includes a stator assembly defining a plurality of stator teeth, a plurality of concentrated phase windings positioned about the stator teeth, a rotor assembly positioned within the prior bore and a plurality of magnets positioned within the interior of the rotor. Also disclosed in a washing machine including such a machine.

Abstract: A permanent magnet structure for use in brushless motors is disclosed. In an exemplary embodiment of the invention, the magnet structure includes a parallelogram shaped body. The body has an outer surface and an inner surface, with the outer surface and the inner surface being arcuate in shape.

Abstract: A magnetic material fixing structure of motor rotor including multiple overlapping silicon steel plates. An outer circumference of each silicon steel plate is recessed to form multiple receptacles at equal intervals. A magnetic material is disposed in each receptacle. The receptacle has two lateral faces, a bottom face and an opening opposite to the bottom face. Each of adjoining sections of the two lateral faces and the bottom face is formed with a dented section dividing the lateral faces and bottom face of each receptacle into multiple resilient plates. When inlaying the magnetic material into the receptacle, the resilient plates are deformed to resiliently tightly clamp the magnetic material.

Abstract: A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and that have opposite edges that are aligned with an axis of the rotor. The axial rotor sections are rotationally offset such that the edges of the permanent magnets create stair step interfaces. The n sets of permanent magnets are magnetized using a magnetizing fixture. The permanent magnets have a generally rectangular shape and are preferably arc magnets or breadloaf magnets. The conductors of the magnetizing fixture are aligned with the stair step interfaces. A magnetic field induced in the permanent magnets is substantially reduced along the stair step interfaces.

Abstract: An electrical machine, in particular a starter-generator, having a permanent-magnetically excitable rotor (19) and a stator (16), the stator (16) carrying a multiphase winding (38) is proposed, having an inverter (22) which is variable by means of a regulating or control device (23) and by which the stator (16) can be operated in the field attenuation mode; the rotor (19) has a number of teeth equivalent to n times the number of phases of the multiphase winding (38) in the stator (16), and each phase winding (36) comprises at least one coil (34), and all the coils (34) of the multiphase winding (38) are disposed side by side in the stator (16), and the rotor (19) has a number of poles equivalent to n times the number 4, one pole (32) of the stator (16) having a maximum width of a pole pitch (Tp), and the spacing (A) of two poles (32) of the stator (16) being equivalent to at least one-third the pole pitch (Tp).

Abstract: The invention relates to a disk motor with an armature disk, which is rotatably mounted and provided with permanent magnets, and with a stator which comprises a stator plate which is equipped with coils. The aim of the invention is to provide a disk motor that is as flat as possible and that is characterized by an improved smoothness of running. To this end, an annular soft-magnetic prestressing device is arranged concentrically on the stator plate in such a manner that at least one section of the prestressing device is located below the coil window of the coils in the axial direction. The armature disk may support an annular flux-return element opposite which the annular prestressing device is located in the radial direction. Said prestressing device has a cross-sectional contour that guides the magnetic lines of electric flux from the annular flux-return element to the coil window.

Abstract: An Archimedes' screw serves as a rotor, inducer, impeller, and/or driver with motor and/or generator configurations that surround the screw by attaching to an outer cylinder of the screw. The screw acts as the motor's rotor axis with attached permanent magnets and or frame and the stator is built around the auxiliary circumference of this rotor. The rotor may also house half the bearings and can be used for the movement of fluids and/or solids, for cavitation-less drive of water vehicles, or for the generation of electrical power when the fluids become the motive force to drive the unit.

Abstract: An electric machine includes a stator and a permanent magnet flux-concentrating rotor. The permanent magnet flux-concentrating rotor has permanent magnets and pole pieces. The permanent magnets are engaged between the pole pieces. The electric machine also has at least one magnetic-field detector that is mounted on the stator. The at least one-magnetic-field detector is mounted on the stator in such a manner as to detect a magnetic field of the permanent magnets in a location that overlaps a peripheral region of the rotor when the machine if observed on the axis of rotation of the rotor.

Abstract: A stepping motor including a rotor having a plurality of magnetic poles, one stator base arranged near the rotor, a pair of magnetic yokes fixed on the stator base and arranged to face the magnetic poles of the rotor, a pair of excitation coils for exciting the pair of magnetic yokes respectively in response to drive pulses which have phase difference, and a pair of stator magnetic polar portions integrally formed with the stator base. The stepping motor is constructed to form magnetic paths together with the number of magnetic turns of the excitation coils without increasing the size of the magnetic yokes, thereby enhancing operations and reliability.

Abstract: To provide a rotor for a motor capable of effecting improved torque variation due to improvement in the induced voltage waveform and of effecting improved magnet torque in a permanent magnet type synchronous motor utilizing reluctance torque. A rotor 11 comprises a core 12 made of a ferromagnetic material, a given member of permanent magnets 14 are mounted in the outer surface of the core 12 circumferentially at equal intervals, and arrangement of the permanent magnets 14 is such that polarities N, S of the permanent magnets on the sides facing a stator are disposed alternately. Also, in the core 12 between the center axis of the core and the permanent magnets 14 are embedded arc-shaped permanent magnets 16 corresponding to the permanent magnets 14, respectively, and arrangement of the permanent magnets 14 is the same as that of the corresponding permanent magnets 16.

Abstract: A rotor for a high speed permanent magnet motor comprises a central spindle (20), and a plurality of magnet discs (21) stacked on the spindle (20) and axially clamped by a clamping device (24-26, 28) on the spindle (20) to form an axially pre-tensioned disc packet core (16). Each magnet disc (21) has at least one electrically insulating layer, and a reinforcement disc (23) is provided between the magnet discs (21) and/or between at least one of the magnet discs (21) and the clamping device (24-26, 28). The reinforcement discs (23) are clamped such that a clamping force generated frictional engagement is obtained between the reinforcement discs (23) and the magnet discs (21) by which centrifugal forces are transferred from the magnet discs (21) to the reinforcement discs (23) during motor operation, thereby relieving the magnet discs (21) of tensile stress.

Abstract: The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a permanent-magnet rotor and a stator comprising teeth and respective individual windings on said teeth.

Abstract: A rotor according to the prior art has a top part and a bottom part, where the bottom part has stays that are mechanically connected to the top part. However, this has the disadvantage that very strict tolerances must be respected and the type of fastening is not secure. A rotor according to the invention has a ring, which presses stays and thus, by means of positive and frictional engagement, magnets against a tubular element, which in turn is disposed on a bottom part. The bottom part, together with a rotor shaft and a top part, constitutes a rotor.

Abstract: A system for forming a precision shaft for a permanent magnet motor employs a working surface region of the precision shaft and a coaxially arranged rotor region. A cutting tool is used to make a first machining or cutting pass along the entire length of the working and rotor regions. Subsequent passes of the cutting tool are limited to the working region of the motor shaft to form a threaded ball screw shaft portion. The rotor region, however, remains with but a continuous shallow groove that is surrounded by a helical shaft portion having the original diameter of the precision shaft. Thus, preparation of the shaft to effect bonding of the magnetic rotor does not affect the shaft diameter. The depth of the shallow groove in the rotor region is approximately between 0.001″ and 0.004″, and preferably 0.003″. The permanent magnet rotor is bonded to the rotor surface region of the precision shaft by an A+B heat cured type of epoxy.

Abstract: An electrical generator has a plurality of mutually spaced magnets that move together relative to at least one coil to generate an electrical signal in the coils. Equal numbers of magnets and coils, with equal lengths and spacings between them, are preferably employed. Significant enhancements in power output are achieved by orienting successive magnets in magnetic opposition to each other, so that the magnetic fields from successive magnets along the axis of movement substantially cancel each other at locations between the magnets.

Abstract: The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. Several winding configurations are proposed and a special one with only one coil per slot. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the mosfets voltage for the current measurement.

Abstract: A method for determining a dimension in a motor is described. By applying Fourier analysis, a sequence of terms is obtained. Since the fifth harmonic is the most undesirable term, the minimization of the fifth harmonic term will make resultant waveform closer to sine wave. Based upon the above, a determination of an angle &dgr; (22) is described, wherein the fifth harmonic term of the sequence of terms is minimized. An electronic motor having a rotor (26) and a set of slot on said rotor surface (36) having a set of magnets (46) with a width &dgr; (22) along the circumference (30) of said rotor surface (36) is described. The width &dgr; (22) is determined by a method that includes applying Fourier analysis thereby a sequence of terms is obtained. Since the fifth harmonic is the most undesirable term, the minimization of the fifth harmonic term will make resultant waveform closer to sine wave.

Abstract: The field force manipulation powered motor consists of gears, bearings, and magnets so arranged as to create and maintain a constant field force alignment conflict that results in the development of rotational energy.

Abstract: A motor that can obtain a sufficient magnetic attraction force by a magnetic attraction member with a relatively simple and small structure is provided. The motor includes a stator section, a rotor section that is rotatably supported through a bearing section by the stator section, a rotor magnet disposed opposite to the stator core, and a magnetic attraction member that is disposed opposite to a circumferential wall surface of the rotor magnet in a radial direction to magnetically attract the rotor section toward the stator section by a magnetic action between the rotor magnet and the magnetic attraction member. The magnetic attraction member includes a generally cylindrical member that is disposed concentrically with the rotor magnet, wherein an outer circumferential wall surface of the generally cylindrical member of the magnetic attraction member is disposed opposite to an inner circumferential wall surface of the rotor magnet.

Abstract: A stepping motor includes a stator whose outer diameter is 8 mm or less and a rotor having a magnet disposed opposing to the stator. The stator has a core with pole teeth formed therein. The ratio between the thickness of the pole teeth formed in the core in the radial direction on the stator side and an outer diameter of the magnet on the rotor side, in other words, the quotient derived by dividing the thickness of the pole teeth by the outer diameter of the magnet, is set in a range between 0.121 and 0.148 to achieve good torque characteristic and linearity.

Abstract: A permanent magnet motor comprises a frame and a plurality of energizable coils mounted on the frame and are substantially equally spaced from one another. A starting coil is mounted on the frame. A wheel is rotatably mounted on the frame. Carried on the wheel are a plurality of permanent magnets, which are substantially equally spaced form one another. The axes of the energizable coils are disposed substantially at right angles to the axes of the permanent magnets. The permanent magnets cooperate with the energizable coils, so that upon energization of the starting coil, the wheel will begin to rotate in a first direction and upon energization of the energizable coils the wheel will continue to rotate in said first direction. The energizable coils are generally cylindrical and the outer surface of each permanent magnet has a recess complementary to the outer surface of the energizable coil so that the permanent magnet and pass closely to the energizable coil during rotation of the wheel.

Abstract: A high temperature superconductor (HTS) synchronous motor or generator includes permanent magnets disposed in the rotor. The permanent magnets can be magnetized after the rotor assembly is manufactured. The permanent magnets reduce flux density perpendicular to the superconducting coil. The magnets can be disposed in the d-axis of the motor. The motor is particularly useful in propulsion applications.

Abstract: In the embodiments described in the specification, permanent magnets are retained on a permanent magnet rotor rim by inverted U-shaped retainers and in one embodiment the outer surfaces of the retainers converge inwardly in the radially outward direction and engage corresponding surfaces of adjacent pole pieces which converge inwardly in the radially outward direction. In another embodiment the U-shaped retainers are affixed to the rotor rim by screws accessible through openings in the radially outer wall of the retainers and a further embodiment each retainer has outwardly projecting flanges which are affixed to the rotor rim by screws.

Abstract: In an electromagnetic converter comprising a rotor arranged by including a permanent magnet, a yoke disposed in the vicinity of the rotor for flowing magnetic flux and a coil wound around the yoke, at least a portion of the yoke is composed of an amorphous metal magnetic material. The amorphous metal magnetic material is a Co amorphous metal or a Fe amorphous metal. The electromagnetic converter is a small generator, a motor and the like. In an electronic timepiece provided with a generator device, the Co amorphous metal magnetic material is used for a first yoke (stator) and the Fe amorphous metal magnetic material is used for a second yoke (coil core). In an electronically-controlled mechanical watch, the Co amorphous metal magnetic material is used for a yoke.

Abstract: An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.

Abstract: A rotary electric machine for a hybrid vehicle includes a rotor connected between a vehicle engine and a torque transmission mechanism at the back of the vehicle engine and a stator. The rotor includes an outer rotor portion having an inner surface electro-magnetically connected to the outer surface of the stator, an inner rotor portion having an outer surface electro-magnetically connected to the inner surface of the stator. The stator includes a stator core disposed between the inner rotor portion and the outer rotor portion and a multi-phase winding wound on the stator to be electro-magnetically connected with both the outer and inner rotor portions.

Abstract: A moving apparatus with a driving force assist mechanism traveled mainly by human power. This moving apparatus detects, in a non-contact manner, with respect to rotating portion such as traveling wheel, etc., rotation speed of the rotating portion to detect traveling state to deliver, from the driving force assist mechanism, assistant driving force corresponding to speed change information that a person who operates the moving apparatus intends to give on the basis of the detected traveling information to carry out traveling to thereby permit smooth traveling even in the case where traveling by only human power becomes difficult.

Abstract: A method is disclosed for fitting a rotor enclosure over at least one assembly of field windings mounted on a rotor core, said method comprising the steps: applying a force to elastically reduce a circumference of the at least one assembly of field windings mounted on the rotor core, where the reduction in circumference is greater than a circumference reduction due to just eliminating clearances between adjacent end-turns of windings; generating a clearance between the field windings and the rotor enclosure due to the application of the force; axially sliding the rotor enclosure over the at least one assembly of field windings while the circumference is reduced, and releasing the force to allow the circumference of the at least one assembly of field windings to expand and cause the enclosure to tightly fit on the at least one assembly of field windings.

Abstract: If an interturn short-circuit occurs in a stator coil winding of a permanent magnet excited electric machine, a short-circuit current is produced there that results in an electrically induced magnetic alternating flux which corresponds in its value to the permanent magnetic alternating flux flowing through the respective winding and which is opposite in phase. Such a short-circuit current could lead to burn-off of the turn due to its considerable strength and the loss associated therewith. To prevent this, the invention suggests in case of detection of an interturn short-circuit, to entirely short-circuit at least the coil affected by the short-circuit or to apply thereto a corresponding in-phase current and to reduce the excessive short-circuit current in the individual turn or in the individual turn section by way of this overall short-circuit current in the coil. It is thus possible to prevent burn-off of the respective turn part.

Abstract: An outer rotor type brushless direct current motor has an outer rotor including a plurality of permanent magnets attached along the inner circumference of an annular yoke such that the magnetic poles face the S magnetic poles. Thin sections are formed by chamfering the radially outer periphery of the two end sections in the circumferential direction of each of the permanent magnets. Magnetic flux passage sections of the yoke providing connection between the thin sections of adjacent permanent magnets are expanded radially inwards. In accordance with the above-mentioned arrangement, the cross section of the magnetic path in the magnetic flux passage sections is increased, thereby suppressing the occurrence of magnetic saturation and preventing the maximum torque of the permanent magnets from decreasing while reducing their size. Moreover, because the magnetic flux passage sections of the yoke are expanded radially inwards, the external dimensions of the yoke do not increase.

Abstract: An electric motor comprises a shaft to which a stator is fixedly mounted and a rotor is rotatably mounted. The shaft defines a longitudinal axis having opposing ends that are fixedly mounted to a frame of a conveyor or a treadmill. The stator preferably comprises multiple windings capable of reversible current flow so that the winding polarity may be altered. The rotor comprises multiple magnets that are radially spaced about the periphery of the stator. Each of the magnets has at least one predetermined pole. A controller is coupled to the windings and controls the direction of the current flowing through the windings in such a manner to initiate and control the rotation of the rotor about the stator. Cooling fins are provided in an end cap mounted to the rotor.

Abstract: Disclosed is a method for manufacturing a DC motor. The method comprises the steps of attaching a magnet to a circumferential inner surface of a case; rotatably assembling a rotator including a shaft, a coil and a core in a manner such that a predetermined air gap is defined between the magnet and the rotator; positioning the case having the magnet attached thereto, in a magnetizing yoke; and magnetizing the magnet.

Abstract: An electromagnetic rotary drive, designed as bearingless motor, is proposed which comprises a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding for producing a magnetic rotary drive field which produces a torque on the rotor (3), and a control winding for producing a magnetic rotary control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with the stator (2) having exactly six stator teeth (21).

Abstract: A composite powder metal disk for a rotor assembly in a circumferential type interior permanent magnet machine. The disk includes an inner ring of magnetically conducting powder metal compacted and sintered to a high density. The disk further includes an outer ring of permanent magnets separated by magnetically non-conducting powder metal compacted and sintered to a high density. The permanent magnets additionally are radially embedded by magnetically conducting powder metal compacted and sintered to a high density with optional intermediate non-conducting powder metal bridges extending radially from the permanent magnets to the outer surface of the disk. A rotor assembly is also provided having a plurality of the composite powder metal disks mounted axially along a shaft with their magnetic configurations aligned. A method for making the composite powder metal disks is further provided including filling a die with the powder metals, compacting the powders, and sintering the compacted powders.

Abstract: A pump unit for medical and food use, including: a stator provided with a number n of poles and powered by a power and control circuit fed by alternating electric current; a rotor having an equal number n of poles, which is fixed directly onto a shaft of a pump; and a jacket of amagnetic material which isolates the rotor from the outside and is positioned within the air gap between the rotor and the stator.

Abstract: Featured is a method for passively-repulsively lifting a rotor assembly (11) of a flywheel energy storage system (10), comprising the steps of mechanically coupling a first permanent magnet (204a) to the rotor assembly (11) and fixedly positioning a second permanent magnet (204b) proximal to the first permanent magnet (204a) so that a repulsive force is generated therebetween causing the first permanent magnet (204a) to move with respect to the second permanent magnet (204b), thereby causing the rotor assembly (11) to be lifted to an operating level. The method further includes applying a radial force sufficient in magnitude and direction to oppose a radial force being generated by the permanent magnet repulsive force. Also featured is a passive-repulsive rotor assembly lift system (100) for a flywheel energy storage system (10) and a flywheel energy storage system (10) including such a repulsive rotor lift system (100).

Abstract: A method for varying motor output using magnets of different fluxes includes manufacturing standardized parts, ascertaining desired motor output, selecting from a group of interchangeable magnets to provide the desired output, and assembling a motor with the selected magnets and standardized parts such that the desired output is provided. Additionally, a motor kit including a rotor configured to accommodate magnets of varying residual induction values and lengths, a stator configured to operate with the rotor, and a plurality of interchangeable magnets with different residual induction values and lengths.

Abstract: A multi-position actuator with three electromagnetic poles where the airgap of selected pole(s) is made different from the remaining pole(s). The multi-position actuator comprises a housing, an armature rotatably mounted in the housing, and three poles journaled around the armature. There is also a stop arm attached to the armature which stops the rotation of the armature when the stop arm hits an adjacent stop. These stops are positioned within the housing to limit the rotation of the armature. This multi-position actuator is designed to form either a fail safe actuator or a latching actuator by adjusting the spacing of the air gap between the poles and the armature. When used with continuous rotation without the stop mechanism, the air gap(s) of the pole(s) can be adjusted in a repetitive manner to produce a useful magnetic torque.

Abstract: A magnetic sleeve assembly for use in a linear compressor motor, including a support sleeve and a plurality of magnets attached to the support sleeve by mounting rings. The mounting rings have angled lips extending over and contacting the ends of the magnets, which have beveled bearing surfaces on their ends. As the assembly expands and contracts, the mounting rings maintain the magnets in place.

Abstract: This invention is an engine that uses the power of the repelling force of natural magnets to create a turning energy. This turning energy is produced by a system of conveyer belts, pulley rings, and gears that are connected to a “magnetic hammer” piece to react at the right time to allow the “magnetic hammer” piece to go up and repel the magnet on an arm and the other hammer piece proceeding the arm to go down and out of the way for the arm to pass. This arm will be connected to a middle bar that will be connected to the system just stated and be the object that turns to which can be used for anything that needs a turning energy. This invention will be an alternative to engines that run on other more expensive or time costly power sources.

Abstract: A linear electromagnetic machine for generating a force acting between two members relatively movable along an axis, one of which is capable of producing a magnetic field the direction of at least part of which extends substantially radially of the said axis and the other of which comprises or includes a conductor, conveniently in the form of a coil, in which an electric current can flow substantially perpendicularly of the magnetic field so as to generate a force between the two members substantially parallel to the axis. The radial magnetic field is generated by permanent magnets orientated with their direction of magnetisation axially, the pole pieces acting to concentrate the magnetic flux to follow a radial path through the coils.

Abstract: A rotor of a motor has a cylindrical magnet coaxially disposed with a shaft. The shaft and the magnet are bonded with thermosetting resin formed by injection molding. Since the molding shrinkage of the thermosetting resin is so small that a high preciseness is achieved in the motor structure. This precision structure can reduce vibration due to unbalance of a rotor. Also, an annealing process, in which a motor is left at a temperature higher than the limit temperature for operating the motor, can be eliminated. As a result, the efficiency of producing the motor can be improved.

Abstract: The invention refers to magnetoelectric machines and comprises a rotor made in the form of at least two disks, the magnetized disks have circumferential arrayed like poles and an axially magnetized polygon or cylindrical magnet placed between the disks. The stator comprises a winding selected from the group consisting of a coil winding and a wave winding coils that are distributed over the circumference and are installed predominantly in the space between the rotor poles provides for the possibility of the end face interaction with the rotor poles. Each of at least two disks could be made of a non-ferrous material with embedded magnets, and rotor further comprises ferrous metal plates, each of the plates is attached on an outer surface of each disk and comprises a ferrous metal cylinder for interconnecting a magnetic flux between ferrous metal plates. The rotor could be made as a multi-sectional unit. The disks could be made integral with a magnet in such a manner that they serve as magnet's poles.

Abstract: A permanent magnet motor having a stator and a permanent magnet rotor facing the stator with a gap therebetween, the stator having a plurality of stator magnetic poles extending radially toward a peripheral surface of the rotor, s number of small stator teeth formed on a tip end of each of the magnetic poles, and exciting windings of m phases wound around the stator magnetic poles. The rotor having a cylindrical permanent magnet having pieces of N pole and pieces of S pole arranged alternately in a peripheral direction thereof at equal pitches, wherein a pitch of the small stator teeth is 1±1/(2 ms) times larger than a pitch of the rotor magnetic pole pairs. The width of the small stator tooth is 37˜47% of the magnetic pole pitch. A depth of the groove formed between the adjacent small stator teeth is more than 15 times larger than the length of the air gap between the stator and the rotor.

Abstract: An interior permanent magnet synchronous motor capable of significantly restraining cogging torque and torque pulsation during feeding of electricity thereto. Each of the outer peripheral surface sections of a rotor core and a magnetic pole surface of each of magnetic poles of a stator core are arranged so as to have a gap defined therebetween and having a size &dgr;d which satisfies an expression &dgr;d=&dgr;d0/cos(p&thgr;d), wherein &dgr;d0 is a size of the gap which is determined along a virtual center line defined so as to extend through centers of two virtual lines extending from a center of a shaft through both ends of the outer peripheral surface section defined in a peripheral direction thereof and &thgr;d is an angle between the virtual central line and each of the virtual lines.

Abstract: A rotor mount assembly, located between a rotor shaft and a plurality of magnetic elements, resiliently damps vibrations induced from the plurality of magnetic elements. The rotor mount assembly includes a first resilient ring, a second resilient ring, and a laminated spacer. The laminated spacer includes laminates from a stator core center punch. Both resilient rings include an inner metal insert which, in one embodiment, comprises laminates.

Abstract: A method of expanding types of synchronous motors capable of reducing the number of required stator types to use stators in common, and a synchronous motor produced by the method. A group of stators are prepared by stacking stator cores of identical shape so that heights of the stators are different from one another to be multiples of a fundamental height. A plurality of groups of rotors are prepared so that lengths of the rotors in each group are different from one another to be multiples of a fundamental length. The rotors in each group are provided with permanent magnets having a residual magnetic flux density different from that of the permanent magnets for the rotors in the other groups. A stator and a rotor corresponding to a preset output torque specification value and a preset rotor inertia specification value are respectively selected from the group of stators and the rotor groups and are combined with each other, whereby an expanded type of motor is obtained.

Abstract: An induction motor rotor comprises a rotor shaft, a rotor core, which may be solid or may include a plurality of rotor laminations, having rotor bar slots, a plurality of rotor bars extending through the rotor bar slots, and two rotor end rings brazed to the rotor bars and extending to the rotor shaft, the rotor bars and rotor end rings pre-stressing the rotor core.

Abstract: A DC machine for use as a DC motor (10) or generator, comprising an outer casing (100), and a rotor (200) comprising a central shaft (220) and at least one cylindrical permanent magnet (230) which has a central axis coincident with the shaft (220) and is supported for rotation about its axis within the casing (100). The magnet (230) provides a unipolar radial magnetic field. An annular gap (218) is formed within the rotor (200), which extends co-axially with the magnet (230) such that the magnetic flux of the radial magnetic field extends at substantially right angles across opposite sides of the gap (218 ). The motor (10) includes a cylindrical stator (300) located co-axially within the gap (218). The stator (300) comprises an armature in the form of a hollow cylindrical roll (310) of elongate insulating substrate (320) having one surface bearing a conductive pattern (330). The pattern (330) has two ends for connection to a DC power source and includes a multiplicity of straight conductors (334).

Abstract: This spindle motor has a base plate, a stator mounted on the base plate, a bearing provided on the base plate, a rotating shaft rotatably provided on the bearing, and a rotor fixed to the rotating shaft. The rotor is formed of a metallic magnetic substance and resin and is fixed to the rotating shaft at the magnetic substance, and a field magnet fixed to the rotor. The field magnet is pressed into and fixed to the rotor at a resin section of the rotor.