Abstract: An apparatus and method for suspending a stator core (100) in an electric generator upon a foundation (206), where two natural modes of vibration, including known second and third modes, are excited in the core, each mode having four loops and four nodes displaced 45 degrees between the second and third modes. A non-rigid connection (212) connects a yoke to the foundation, and two connection members connect the yoke to the stator core at opposite sides of the non-rigid connection. The two connection points (210a,b) are located at adjacent loops of one of the second and third vibration modes. By this arrangement, radial deflections of the stator core at the respective connection points are transferred into a rocking movement of the yoke around the non-rigid connection. Thereby, vibrations transferred to the foundation are considerably reduced during operation.

Abstract: The present invention prevents peak noise caused by a resonance frequency, and reduces an overall noise of the system by binding core teeth of a stator of a BLDC motor with a vibration prevention member. To do this, the present invention provides a brushless DC motor for a washing machine including a stator including a frame, a core in the frame, and a plurality of core teeth each extended outward from the frame and having a coil wound thereon, a rotor mounted to surround the core teeth, and rotatable when power is provided to the stator, and a vibration prevention member connected between the core teeth to bind the core teeth to each other, for prevention of vibration of the core teeth.

Abstract: A fan motor support bracket has a central body portion and first and second end portions upwardly offset from the central body portion. First and second transition portions extend respectively between the first and second end portion and first and second ends of the central body portion. The central body portion has a base and first and second sidewalls extending generally upward from the base. The first sidewall has at least one relief for accommodating a mounting ear of the motor.

Abstract: Embodiments of the present invention effectively control, by a simple structure, floating of a rotor of a fluid dynamic bearing motor mounted in a hard disk drive. In one embodiment, a base is formed of a magnetic material. The attractive force caused by the magnetic force acts between a bottom of the base and a magnet unit that is constituted of a rotor magnet and a back yoke. This makes it possible to attract a rotor to the base against the buoyant force produced by a thrust bearing, and thereby to effectively control the rotation of the rotor. On the bottom of the base, at a position facing the magnet unit, a convex part protruding from the inner surface of the base is formed in a ring-shape. Adjusting the height, or the width, of the convex part makes it possible to control the magnetic back pressure applied to the rotor.

Abstract: The invention relates to the vibration damper systems (here, method and apparatus) for active removal of beyond-normal internal vibrations from turbine-generator-sets [T-G-Ss*]. The invention relies on dynamic forces generated by a pair of “wings” and associated hardware mounted on the bearing housing, which operate to offset internally produced vibrations in an active or “real time” fashion. This is in contrast to the typical method of taking the turbine-generator off-line, shutting it down and then eliminating the source of vibration. The invention allows the generator to remain operational during adjustments. Thus, it remains on-line producing electricity and associated revenue. The system may be installed at presently operating T-G-Ss. It also foresees the simple developments to be done in future designed T-G-Ss for use of this method. The use of invention provides a real solution to internal vibrations that develop in turbine-generator-sets throughout their lifetime.

Abstract: A method of using a balance clip in a hard disk drive spindle motor for disk pack balance correction provides the balance clip with one end that is offset from the circular shape of the balance clip. The offset end is located opposite the precise bent tab that provides tooling engagement in the balance clip. The offset end of the balance clip is offset at a radius that is less than the radius of the balance clip, or at a lesser radial offset from the circular shape. The edge of the offset end does not make contact with the groove in which the balance clip is seated. This design eliminates scratching between the offset end and motor hub, and reduces friction and particle generation during clip adjustment in the disk pack balancing process.

Abstract: A brushless DC motor includes a fixed portion and a rotor. The rotor includes a shaft and a top engaging face. The shaft is rotatably held by the fixed portion. The top engaging face is located on a top side of the rotor. The rotor further includes at least one protruded engaging portion on the top engaging face. A carrier such as a tray or the like is fixedly coupled with the at least one protruded engaging portion. A compartment is defined in the rotor by the at least one protruded engaging portion. A filling material may be filled into the compartment for adjusting rotational balance of the rotor.

Abstract: A dynamoelectric machine includes a rotor having a rotor shaft; two flux carrying segments rotatably disposed on the rotor shaft; a field coil disposed between the two flux carrying segments, the field coil having a pair of coil leads; an insulative member disposed at one end of the shaft; a pair of slip rings longitudinally spaced on the insulative member and having respective coupling terminals; and a diode having a pair of diode leads, each diode lead electrically connected to one of the pair of coil leads of the field coil and to one of the respective coupling terminals, the diode configured to suppress electrical noise as a result of an interface between the pair of slip rings and respective brushes.

Abstract: An electromotive drive is provided, especially for the pump of a power-assisted steering system of a motor vehicle. The drive includes a housing (3) with a bearing journal (15) in which the shaft (18) of a rotor (9) is rotationally mounted. The drive also includes a stator (7) having drive windings. The bearing journal (15) extends through said stator and supports it. The stator (7) is supported by the bearing journal (15), substantially in the transversal direction only. The stator (7) is coupled with the remaining housing (3) in a rotationally fixed manner, so as to transmit the engine torque. The arrangement dramatically reduces disturbing noises which occur especially when the motor is operated at full load and which are caused by relatively high-frequency torque variations.

Abstract: An electric motor includes an armature structure 12 having a shaft 14, a lamination stack 11 coupled with the shaft, a commutator 16 coupled with the shaft, and windings 13 carried by the lamination stack and connected to the commutator. Brushes 17 engage the commutator to deliver electric current to the windings. The motor includes a frame structure 18 and permanent magnets 19 carried by the frame structure. At least one assembly is provided including a sleeve bearing 22, an elastomer structure 24 coupled with the sleeve bearing, and a retainer 26. The sleeve bearing is operatively associated with an end of the shaft to support the shaft for rotation. The elastomer structure is clamped between the frame structure and the retainer, with the retainer being engaged with a portion of the frame structure to maintain clamping on the elastomer structure.

Abstract: According to the invention, in a rotor of a vehicular alternating current generator motor having a Lundell type core having a field winding, a cylindrical portion wound with the field winding, a yoke portion widened from a portion in an axial direction of the cylindrical portion in an outer peripheral direction, and a plurality of claw-like magnetic pole portions constituted to incorporate the field winding, extended in the axial direction from an outer periphery of the yoke portion and folded to bend to be brought in mesh with each other alternately, and a magnet arranged between the claw-like magnetic poles, an outer peripheral face of the field winding and an inner peripheral face of the magnet are made to be proximate to each other to thereby hamper draft between the field winding and the magnet.

Abstract: An electric motor, in particular an external rotor motor, comprising a stator which is attached by means of latching elements to a motor carrier using a plug-in joining operation. The elastic elements for isolating vibration are arranged in the connecting region between the stator and the motor carrier in a way that the stator is indirectly connected to the motor carrier by means of the elastic elements.

Abstract: A prestressing structure for rotationally balancing a motor includes a motor stator, a motor rotor, a magnetically conductive member and a balancing magnet. The motor stator has an axial hole and an axial tube extending therethrough. An end of the axial tube provides with the magnetically conductive member. The motor rotor has an inner surface and a shaft seat mounted thereon. A top portion of the shaft seat provides with the balancing magnet which has at least one surface successively attracting at least one surface of the magnetically conductive member for stabilizing rotary movement of the motor.

Abstract: The design comprises a shaft and sleeve supported for relative rotation by a journal type fluid dynamic bearing utilizing grooves on one of the shaft or sleeve surfaces. A grooved pattern of a design similar to that usually found on a thrust plate is defined on an axial end surface of the shaft or the counterplate facing the axial end of the shaft, so that thrust is created to maintain separation of the end of the shaft and the facing thrust plate during relative rotation. In one embodiment, to establish and maintain the gap between the shaft end and the facing counterplate, the journal bearing has an asymmetry to pump toward the shaft end having the bearing. In a further refinement, to maintain the shaft and gap within an optimum spacing, a magnet is mounted to provide an axially directed magnetic force on the shaft which works against the axial force created by shaft end thrust bearing.

Abstract: An electric motor system and method are shown having a circuit board arranged in a plane that lies in a predetermined angle relative to an axis to an armature of the electric motor. In one embodiment the predetermined angle is an acute angle and the plane is not perpendicular to an axis of an armature of the motor 10. Brushes are located remotely from the board.

Abstract: A commutator for an electric machine comprises a support member (1) made from an insulating molding compound, a plurality of metal conductor segments (3) disposed thereon in evenly spaced manner around the commutator axis (2), with terminal elements disposed thereon for a rotor winding, and an interference-suppression device (9, 9?), to which the conductor segments (3) are connected in electrically conductive manner and which comprises a number of individual interference-suppression elements (10) corresponding to the number of conductor segments (3), wherein the conductor segments (3) are provided with contact tabs (18), which are respectively connected, at a distance from their root points (19), via associated contact points (23), to the adjoining contact poles (24) of two neighboring interference-suppression elements (10).

Abstract: It is intended to suppress the vibration and noise during operation of a concentrated winding electric motor and to provide an electric motor with high efficiency, low vibration and low noise. A skew is formed on at least one of a stator (10) and a rotor (20), arranged with a concentrated winding, and a winding vibration damping body (18) is inserted between windings (13) of different phases within a winding groove (19) and contacted therewith.

Abstract: A brushless permanent magnet electric machine includes a stator assembly having a stator core that defines (12×n) slots and stator teeth having a generally “T”-shaped cross section. Winding wire is wound around the stator teeth, wherein a radially outer edge of the stator teeth define a crowned surface. A rotor includes permanent magnets defining (12±2)n poles, wherein n is an integer greater than zero.

Abstract: A portable power source (10) includes a housing (12), a stator component (20), a rotor component (18), a crank assembly (14), and a control system (24). The stator component (20) is secured to the housing (12), the rotor component (18) rotates relative to the stator component (20) and the crank assembly (14) is coupled to the rotor component (18). The crank assembly (14) is rotated by the user relative to the housing (12). As provided herein, rotation of the crank assembly (14) by the user results in rotation of the rotor component (18) relative to the stator component (20). In one embodiment, the control system (24) controls the amount of torque required to rotate the crank assembly (14). For example, the amount of torque required to rotate the crank assembly (14) is varied according to the rotational position of the crank assembly (14).

Abstract: A compliant stator motor is disclosed. In one implementation, the motor (200) includes a rotor (210), a stator (220) having main and auxiliary windings, an outer motor case (230), and a group of isolators (240) positioned between the stator (220) and outer motor case (230) to enhance forces applied to the foundation (260) due to excitation of the auxiliary windings. In another implementation, the motor (300) includes a rotor (310), a stator (320) including main and auxiliary windings, linear bearings (320) configured to constrain a motion of the stator (320) to an axial direction, and isolators (330) connected to the stator (320) and configured to enhance axial forces applied to the foundation due to excitation of the auxiliary windings.

Abstract: The invention relates to the decoupling device for an actuator, which has a number of decoupling elements. A securing element is disposed between these decoupling elements. The actuator is fastened to the securing element. The decoupling elements rest against radial support shoulders and axial support shoulders of the securing element and a housing. These are embodied so that radial, axial, and tangential oscillations of the actuator are decoupled from the housing.

Abstract: The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent magnet dual-rotor is located inside and outside of a torus-shaped stator with back-to-back windings, respectively. The machine substantially improves machine efficiency by reducing the end windings and boosts the torque density by at least doubling the air gap and optimizing the machine aspect ratio.

Abstract: A combination structure of a motor has a base board, a printed circuit board and at least one sensing unit. The base board is used for placing a stator and a rotor and has at least one first assembly hole. The printed circuit board is connected to the base board and has at least one second assembly hole. The sensing unit is used for sensing a magnet of the rotor. The second assembly hole of the printed circuit board is placed corresponding to the first assembly hole of the base board for commonly containing the sensing unit so that an axial height of the motor is decreased.

Abstract: At least one cavity is formed extending along the axis of rotation of a rotor. One or more elastic members are fitted into the cavity to balance the rotor. Once the elastic members are inserted in the cavity, they apply their own elasticity to the inner wall of the cavity, so that they are stably held in the cavity.

Abstract: A spindle motor structure includes a rotor, a stator accommodated mainly inside the rotor, and an internal roof magnet located on an inner roof surface of a rotor bell of the rotor. The internal roof magnet further has an inner rim and an outer rim. The inner rim is located projection-wisely within a range of a hollow shaft of the stator. The outer rim is located projection-wisely between an internal peripheral surface of the rotor bell and an inner edge of a coil of the stator. By providing the internal roof magnet inside the rotor bell, a magnetic field to immerse the stator can be generated to damp out possible operational noises and disturbance upon the spindle motor.

Abstract: Output wires are all led out of Address 1 in slots and vibration-absorbing bent portions are formed on all of the output wires between a leader portion led out from a rear-end coil end group and a tip portion of the output wire.

Abstract: A horizontal-axis electrical machine has an built-in stator concentrically surrounded by a number of parallel retaining rings that spaced apart from one another in the axial direction and are connected on their outer circumference on opposing sides in each case by means of retaining structures to a base frame which extends in the axial direction. A horizontally acting spring, which has the form of a perpendicular, longitudinal plate, is fixed on the one hand with its ends to the associated retaining ring, and is firmly connected on the other hand with its freely flexible central part to the base frame by means of connecting elements, being provided within each of the retaining structures. Improved oscillation isolation between the built-in stator and the base frame is achieved in such an electrical machine by vertically acting spring elements disposed between the ends of the spring and the associated retaining ring.

Abstract: A support actuator 20 comprises an electro-magnet 21 having an input current 22, provided through a current controller 23, and which is arranged to generate a magnetic field 24 having a variable intensity proportional to a variable current 25 supplied by the controller 23. The intensity of the field 24 is controlled to ensure that the magnet 21 is separated from a support armature 26 arranged to carry a load by an operational gap 27. A load cell 28 is connected between the armature 26 and a mounting position 29 for the armature 26. The cell 28 produces a control signal 30 representing variations in force generated by the magnetic field 24 which acts on the load, and the signal 30 is fed backward, along a feedback control path 31 to the controller 23 so as to control the variable current 25 such that it is made substantially equal to a gain demand force D.

Abstract: In an inexpensive electric tool, a thin insulating layer is provided by pouring an insulating resin material by the injection molding to extend from a rotor supporting portion 1a formed in an outer casing to an inner surface or inner and outer surfaces of the outer casing. Also, as another configuration and method, an insulating piece 12a for covering the inner surface of the rotor supporting portion is provided, and also an insulating block for covering the rotor supporting portion and supporting ribs is provided.

Abstract: A bracket assembly for a dynamoelectric machine includes a base plate and a bracket support assembly. The bracket support assembly includes a first end plate, a second end plate and a support member connected to at least one support plate. The bracket support assembly reinforces the bracket assembly and provides a configuration effectively achieving a desired natural frequency which is unlikely to be excited in use.

Abstract: Disclosed is a scroll compressor enabling a significant height reduction to use a space of a system efficiently when the scroll compressor is applied to such systems as a refrigerator, an air conditioner, and the like. A compressor housing forms an exterior, a crankcase is fixed inside the compressor housing, a boss is formed at a central portion thereof to protrude downward, and a bearing hole is formed in a center thereof. A stator having a hollow shape is fixed to a lower side of the crankcase, and a rotor is provided to maintain a clearance between an outer circumferential surface of the stator and an inner circumferential surface thereof. A crankshaft is provided to pass through the bearing hole and is fixed to the rotor to revolve together with the rotor, wherein an eccentric pin is formed on an upper side thereof. A orbiting scroll is connected to the eccentric pin, and a fixed scroll fixed to an upper side of the crankcase to form a compression chamber together with the orbiting scroll.

Abstract: The invention relates to an apparatus for vibration-insulated mounting of an electric motor (20), in particular a blower motor, having a first housing part (10), which encloses at least one pole ring (22) and magnets (24) of the electric motor (20) and has at least one opening (14, 16), through which the shaft (18) of the motor (20) reaches, and having a second housing part (54), which is embodied as a motor flange for securing the electric motor (20) to a carrier element, for instance a motor vehicle heating and/or air conditioning system, and at least partly embraces the first housing part (10) in the axial direction of the motor shaft (18).

Abstract: A rotor for an interior permanent magnet machine that tends to reduce magnet chattering that includes a rotor stack defining at least one magnet retention slot and a permanent magnet positioned within the magnet retention slot, where the magnet retention slot is formed such that movement of the permanent magnet towards at least one end of the slot will tend to cause the magnet to become wedged within the slot.

Abstract: A stator (10) for a motor according to this invention has a substantially cylindrical shape and is disposed coaxially with respect to a substantially cylindrical rotor (20) which has permanent magnets. The stator (10) has a stator core (1) containing teeth (3) projecting towards the rotor (20). Each tooth has a tooth body (1b) on which a coil (2) is wound and a tooth tips (1c) having a substantially arc-shaped surface. The tooth tip (1c) faces the rotor (20) through the substantially arc-shaped surface and does not have the coil (2) wound thereon. The stator core has two types of steel plates (11e, 11d) laminated in an axial direction. The centers (16, 16?) of the tooth tips of the two types of steel plates (11e, 11d) in a peripheral direction are offset in a peripheral direction from the center (15) of the tooth body in a peripheral direction. The two types of steel plates (11e, 11d) have the tooth body (1b) of the same shape.

Abstract: In an electric motor, a shaft 12 is supported by a sleeve bearing 10 and axial movement of the shaft 12 through the bearing 10 is restricted by an abutment 20 supported by or as a part of spacer 14. The abutment 20 has a thrust face 22 which bears against an end face 16 of the bearing 10 creating a thrust/bearing interface. The thrust face 22 has a part spherical profile to accommodate variations in the alignment between the bearing 10 and the shaft 12 due to manufacturing tolerances, etc.

Abstract: A balance clip in a hard disk drive spindle motor facilitates improved disk pack balance correction. The balance clip has one end that is offset from the semi-circular shape of the body of the balance clip. The offset end is located opposite the precise bent tab that provides tooling engagement in the balance clip. The offset end of the balance clip is offset at a radius that is less than the radius of the balance clip, or at a pre-determined, lesser radial offset from the original circular shape. Consequently, the cross-sectional edge of the clip at the offset end does not make contact with the surface of the groove in which the balance clip is seated. This design eliminates scratching between the offset end and motor hub, and thereby greatly reduces friction and particle generation during clip adjustment in the disk pack balancing process.

Abstract: A stator for a dynamoelectric machine includes an annular stator core in which a large number of slots extending in an axial direction are disposed in a circumferential direction so as to open radially inward; a stator winding having a plurality of winding phase portions installed in the stator core, lead wires of the plurality of winding phase portions being led axially outward within a predetermined circumferential range from an axial end of a first coil end group formed at a first axial end of the stator core; and a first mass adjusting portion disposed at a first end of the stator core, the first mass adjusting portion adjusting a circumferential mass imbalance relative to a central axis of the stator core resulting from a circumferential bias in positions from which the lead wires are led out.

Abstract: A yoke in a motor includes a cylindrical yoke housing having a closed end and two magnets that is located in the yoke housing. The magnets are fixed to the yoke housing with adhesive. The adhesive is applied a at least to each adhering area of the yoke housing that is to be adhered to the corresponding magnet or to an adhering area of the each magnet that is to be adhered to the yoke housing. The adhesive is spread to the adhering areas of the yoke housing and each magnet by sliding the adhering areas on each other. Therefore, the magnets are firmly fixed to the yoke housing with a small amount of adhesive.

Abstract: An engine-generator arrangement comprising an internal combustion engine whose output shaft is connected to the drive shaft of the generator by way of an elastic coupling, wherein the engine casing of the internal combustion engine is connected elastically and preferably rubber-elastically to the generator casing of the generator.

Abstract: A drive device includes an electric drive motor, a housing with a housing cover, at least one shaft that is powered by the drive motor and compensating element(s) for compensating the axial play of the shaft. The compensating elements include at least one axially elastic, deformable elastomer element having at least one contact surface. The contact surface(s) has a PTFE, PET or corresponding coating.

Abstract: A method of fabricating a dynamo-electric machine rotor is provided. The method includes forming a plurality of laminations, such that a plurality of openings extend through the laminations between an outer peripheral edge and an inner peripheral edge arcuately spaced about the lamination wherein each opening includes an edge with a tongue that extends into the opening, stacking the laminations to form a core wherein adjacent opening are substantially aligned to form a slot in the core and filling the core slots with rotor bar material.

Abstract: The invention concerns an interference suppression system in an engine with permanent magnets activating a functional motor vehicle element, wherein the engine (1) comprises powering brushes (8, 9), connected to an external power source (12) with wires (10, 1) and a metal field magnet frame (2). The invention is characterized in that each brush (8, 9) is connected to the engine metal field magnet frame (2) through at least an interference suppression capacitor (13, 14) and the engine (1) metal field magnet frame (2) is connected to the vehicle earth connection (15).

Abstract: A permanent magnet motor to reduce torque ripple includes a rotor having at least three segments. Each of the three segments is formed sequentially adjacent and aligned along an axis of the rotor. Each segment has at least one pair of permanent magnets disposed at a substantially equal interval in a peripheral direction of the rotor. First and second segments are skewed relative to each other by a first angular displacement, and the first and third segments are skewed relative to each other by a second angular displacement. The first and second angular displacements are selected to cause a net sum of torque ripple produced by each of the segments to be substantially equal to zero during an operation of the motor.

Abstract: An end cap assembly 20 for an electric motor has an insulating body 22 and a conductive cover 24. The cover 24 supports a bearing for a shaft of the motor. The body 22 supports brushes and motor terminals. An EMI device 36 is electrically connected across the motor terminals and is earthed to the cover by way of resilient contacts.

Abstract: A drive assembly in a motorized door opener includes a motor that is mounted on a mounting structure. At least one vibration isolator is provided between the motor and the mounting structure. The vibration isolator includes a first mounting fastener configured to be mounted to a mounting fastener on the motor, a second mounting fastener configured to be mounted to the mounting structure to mount the motor on the mounting structure, and an elastomeric material between the first and second mounting fasteners. The elastomeric material lies between the first and second mounting fasteners so that the isolator's two mounting fasteners are not in physical contact.

Abstract: A spindle motor comprises a baseplate, a shaft supported by said baseplate, a stator assembly having windings, the stator being rigidly attached to said baseplate, injection molded thermoplastic material encapsulating said windings, and a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly. In one embodiment, the stator is coreless. In other embodiments, the stator has a core and the core is substantially encapsulated by the thermoplastic material. In preferred embodiments, the thermoplastic material secures the stator to the baseplate or forms the baseplate.

Abstract: A motor is provided that reduces vibration and noise by suppressing the vibration transmitted from a stator to a housing. Also an apparatus loaded with this motor is provided, that is highly efficient with less vibration and low noise. Notches formed at an outer circumference of a yoke are located on outer peripheral sides of slots, the notches are not in contact with the housing, the yoke located on outer circumferential sides of teeth is provided with axially penetrating through-holes, and an outer circumference of the stator core located on outer circumferential sides of the through-holes is in close contact with the housing, thus making it possible to obtain the motor with high efficiency, less vibration and low noise.

Abstract: Two embodiments of rotating electrical machines wherein the cogging torque is substantially reduced by increasing the cogging number without increasing the number of pole teeth and permanent magnets. This is done by selecting the appropriate magnet angle to increase the number of coggings per revolution and this can be done using a computer analysis of the cogging torque for the individual magnets rather than by a trial and error method.

Abstract: A method and apparatus for tuning the torsional natural frequency of a rotor is disclosed. At least one tuning slot is formed within the winding slots defined by radially projecting winding teeth. The tuning slot extends radially inward from the bottom of the winding slot a distance to tune the rotor to a desired torsional natural frequency. This tuning slot can be positioned preferably at the quadrature axis.

Abstract: An electric motor design and method useful to reduce noise/vibration generated by a rotor/shaft assembly is provided whereby the motor has a stator which has an axial length and a rotor which has an axial length less than the axial length of the stator such that when the rotor rotates within the motor, the rotor is axially fixed by a stator field.