Abstract: The present invention relates to a motor shock prevention structure, which provides a plurality of shock prevention elements enclosed by the inner wall of a shaft tube and the outer wall of a bearing to disengage the bearing from the shaft tube. The shock-absorbent element shall be made of a flexible material being shock-absorbent and damping. Therefore, when a motor rotates, the vibration amplitude generated by rotation of a rotor is isolated and damped by the shock-absorbent elements. Thus, the vibration amplitude won't be transmitted to a base, and the efficacy of electronic system won't be compromised, such that the resonant effect, the vibration and the noise of electronic system can be prevented and the normal efficacy and the operation life span of electronic system can be secured.

Abstract: A mounting arrangement for a refrigerator fan, comprising an electric motor (11) to whose shaft is affixed a propeller (12) with an axial flow passing through a refrigerated air outlet (4b) provided through an internal divisional wall (6) of the refrigerator; a support frame (20) having a marginal portion (21) and incorporating a central hub (22) in which is affixed the electric motor (11); a flexible support (30) in the form of an annular flange presenting an outer portion (31), which is peripherally and removably affixed to the contour of the refrigerated air outlet (4b), an inner portion (32) provided with a central opening (35) and with retaining means (36), which are removably locked to the marginal portion (21) of the support frame (20); and an annular membrane portion (33) interconnecting the outer portion (31) and the inner portion (32), in order to allow for small relative axial and radial displacements therebetween.

Abstract: A spindle motor can include a base, a bearing housing supported by the base, a bearing installed in the bearing housing, where oil is impregnated in the bearing, a rotating shaft rotatably installed in the bearing and having a groove at a predetermined surface thereof facing the bearing, a stator installed around the bearing housing and having a core and a coil, and a rotor fixed to the rotating shaft and having a rotor yoke and a magnet.

Abstract: A rotor for a motor having a rotor core length includes a shaft including a cylindrical portion and a shaft sleeve having a cylindrical opening. The shaft sleeve is coupled to the shaft such that the cylindrical opening and the cylindrical portion define an interference fit. A rotor sleeve extends the rotor core length and includes a cylindrical outer surface and an inner surface. The inner surface is spaced a non-zero distance from the shaft sleeve to define a space. A resilient material is disposed within the space and is bonded to the shaft sleeve and the rotor sleeve.

Abstract: A motor driving unit includes an electric motor and a motor drive control circuit board that is disposed in a position facing the electric motor at a predetermined distance from the electric motor. A pseudo condenser is formed by providing a conductor pattern at a position facing the electric motor, in the motor drive control circuit board.

Abstract: An automotive alternator includes: a case; a shaft; a rotor that is fixed to the shaft; a stator that is fixed to an inner wall surface of the case; and a rectifier apparatus that is disposed inside the case and that is electrically connected to a stator coil of the stator so as to rectify alternating current generated in the stator coil into direct current, the rectifier apparatus having: a heatsink; diodes; and a circuit board that connects the diodes and the stator coil electrically and that is fixed to the case so as to be supported together with the heatsink by mount portions at three points, the alternator being characterized in that: vibration suppressing portions that are thicker than the mount portions and that suppress generation of vibrational modes in the circuit board among the mount portions are disposed on the mount portions.

Abstract: Embodiments of a profile motor are provided. A spindle motor can include a base in contact with a bearing housing, a bearing installed in the bearing housing, a rotational shaft rotatably supported by the bearing, a stator disposed around the bearing housing and having a coil, a rotor including a rotor yoke fixed on the rotational shaft and a magnet fixed on the rotor yoke, a turntable provided above the rotor yoke and rotating together with the rotational shaft, and a plurality of balls provided in a space defined by the rotor yoke and the turntable.

Abstract: A damper for a stator assembly, the stator assembly comprising a stator segment and a seal mounted to the stator segment. The damper locates between the stator segment and the seal, and comprises: a medial section; and opposed arms extending from the medial section. The medial section engages one of the stator segment and the seal and the opposed arms engage the other of the stator segment and the seal. A method of making the damper, comprising the steps of: providing a sheet of material having a medial section and opposed arms extending from the medial section; forming a bend at the medial section so that the medial section can engage one of the stator segment and the seal; and forming a bend at each of the arms so that the arms can engage the other of the stator segment and the seal.

Abstract: A contact element holder, in particular a brush holder for commutator or wiper ring machines, has a carrier that can be secured to the machine housing and at least one quiver, held on the carrier and pointing toward the rotor, for displaceably receiving a contact element, and also has decoupling elements which are disposed between the carrier and the quiver. To achieve good noise decoupling of the contact element from the machine housing and, in use in a commutator machine, for assuring good commutation quality, the decoupling elements are embodied and disposed such that the at least one quiver is capable of executing only a limited rotational pivoting distance about the rotor.

Abstract: An active vibration damping device having a solenoid actuator designed with a movable element positioned inserted into a guide hole of a stator having a yoke member is attached about a coil to form a stator-side magnetic path with the guide hole lying on its center axis, so that current passed through the coil creates actuating force in the axial direction between the stator and the movable element. A magnetic acting force stabilizing portion having a shape that gradually varies in association with axial displacement of the movable element an level of magnetic acting force between a movable element-side magnetic pole forming portion and a stator-side magnetic pole forming portion is disposed on the movable element-side magnetic pole forming portion where a magnetic pole is produced in the movable element and/or the stator-side magnetic pole forming portion where a magnetic pole is produced in the stator.

Abstract: A simple construction causes a spindle motor rotor to be eccentric in a pickup moving direction and improves axial run-out caused by clearance between a rotating shaft and a bearing. A magnetic cap is attached to an end of a bearing of a spindle motor so as to cover an end face. A ceiling of the magnetic cap is an annular magnetic material in which a lid and opposing face protruding therefrom are continuous, and the opposing face works with an annular magnet attached to the rotor to generate an attraction force that causes the rotor to be eccentric. The opposing face is formed so as to be linearly symmetrical with respect to the axis line, which is the pickup movement line.

Abstract: A control device includes a shot-pulse control unit that provides, at a time of starting a synchronous motor, a predetermined current to each phase of a stator of the motor for a short time; a detecting unit that detects a current flowing through each phase when the predetermined current is provided; an estimating unit that estimates a position of the rotor by comparing detected values; a voltage control unit that controls application of a voltage to the synchronous motor based on a high-pressure side pressure of the compressor when the compressor is failed to be started due to any cause; and a magnetism-resistant section having a conductive layer sandwiched by insulating layers. The magnetism-resistant section covers a portion of a substrate of the control device, and a portion at which the conductive layer is exposed is in contact with the housing or a part conducting heat to the housing.

Abstract: A motor includes a fixed portion, a rotor, and at least one balancing plate fixed on the fixed portion. The fixed portion includes a stator having a plurality of pole plates that extend to form a plurality of pole faces, with a gap being defined between a pair of the pole faces adjacent to each other. The rotor includes a shaft and an annular magnet facing the pole faces. The balancing plate includes at least two magnetically conductive faces respectively aligned with the pole faces. The magnetically conductive faces are spaced from each other by a space for mounting a sensor. The magnetically conductive faces face at least one face of the annular magnet. When the rotor turns, the annular magnet of the rotor induces the alternating magnetic fields created by the stator and attracts the magnetically conductive faces to thereby maintain rotational balance of the rotor.

Abstract: An object of the present invention is to provide a motor capable of enhancing the balance correction effect and capable of keeping the balance correction effect for a long term. In a rotary unit, an upper portion in its axial direction of a hub cylindrical portion of a rotor hub, and an outer peripheral side of a radial extension are cut, thereby correcting the rotational balance of the rotary unit. Further, a circumferential wall is provided on the rotor hub, and a notch is provided in a portion of an outer peripheral edge of a mounting plate. By virtue of such configuration, after the motor is assembled, or after a color wheel is mounted on the motor, a first balance correcting member and a second balance correcting member are respectively fixed to lower surfaces of the circumferential wall and of the rotor magnet in the axial direction, thereby correcting the rotational balance.

Abstract: A motor includes a fixed portion, a rotor, a balancing plate, and at least one sensor mounted on the fixed portion. The fixed portion includes a stator having at least one winding and a plurality of pole faces. The rotor includes an annular magnet facing the pole faces of the stator and a shaft rotatably extending through the fixed portion. The balancing plate is mounted on the fixed portion and includes at least two magnetically conductive faces that face at least one face of the annular magnet. The balancing plate presses against and thus precisely positions a body of the sensor so that the sensor and the annular magnet have a certain distance therebetween while providing a magnetically attracting balancing effect between the at least two magnetically conductive faces and the annular magnet.

Abstract: A brushless motor 100 is composed of a motor base 10, a rotary shaft 25 rotatably supported by the motor base 10 through bearings 22 and 23, a back yoke 20 in a shape of flat plate made from a magnetic material being supported by the motor base 10 from one surface of the back yoke in a direction perpendicular to the rotary shaft 25 in a neighborhood of the rotary shaft 25, a plurality of driving coils 31 disposed on another surface of the back yoke 20 opposite to the one surface confronting with the motor base 10 and a rotor yoke 28 having a driving magnet 24 in the shape of ring integrally rotating together with the rotary shaft 25 while confronting the driving magnet 24 with the plurality of driving coils 31 with maintaining a prescribed gap G between them, wherein the plurality of driving coils 31 are disposed on the back yoke 20 around the rotary shaft 25 at angular intervals of a prescribed angle, and wherein the back yoke 20 is provided with a not disposed angular area S in which no driving coil 31 is d

Abstract: A motor includes a yoke housing, an armature, a commutator, a brush, a brush holder, and a yoke side joining part. The yoke housing has an opening. The armature is received by the yoke housing. The commutator is joined to the armature. The brush supplies electricity to the commutator. The brush holder holds the brush. The yoke side joining part connects the brush holder and the yoke housing. The yoke side joining part has an elastic member at an end part of the yoke side joining part. The end part is on a side of the yoke housing. A loss tangent of the elastic member is equal to or larger than 0.6.

Abstract: A washing machine with a vibration-absorbing structure for preventing the transfer of the vibration of the driving part is disclosed. The washing machine includes a rotor housing 50 in which a rotor is installed and which is rotatably moved, a driving shaft 20, 31, 33 for rotating a washing tub or a pulsator using a rotational force transferred from the rotor housing, a power transferring member 120 for transferring the rotational force of the rotor housing to the driving shaft, a rotor bushing 110 coupled to the rotor housing and through which the driving shaft penetrates to be slidingly moved, and at least one vibration-absorbing member 140, 150 installed on a path where a power is transferred from the rotor housing to the driving shaft, for absorbing vibration of the rotor housing.

Abstract: A motor includes a rotor and a stator. A shaft of the rotor is received in a sleeve. A face of the sleeve and a face of the shaft, that are opposed to each other, form a bearing supporting the rotor in a rotatable manner relative to the stator. A sleeve-retaining portion that retains the sleeve has a bottom portion opposed to an axial end of the sleeve. A magnet holder is arranged in the bottom portion to accommodate an attracting magnet magnetically attracting the axial end of the shaft. The magnet holder is held between the axial end of the sleeve and the bottom portion of the sleeve-retaining portion.

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 at least a pair (when symmetrically placed) of “wings” or by at least one “wing” (when centrally placed), or combination of that, 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.

Abstract: In a noise suppression structure of a blower motor according to the present invention, a noise reduction member is disposed inside of a peripheral wall part of an end bracket member in such a manner that the noise reduction member is located in a position opposite side of the peripheral wall part to which a connector part is provided, a metal terminal member extended from the connector part has an extension part extendedly provided along a bottom surface part of the end bracket member in a circumferential direction thereof, and the extension part of the metal terminal member has a connection part to which the noise reduction member is connected.

Abstract: An electric-motor driven actuator has a housing, in which a motor and a carrier plate are arranged and the carrier plate is connected in a fixed manner to a brush holder. The brush holder has a first brush holder which is rigidly connected to the carrier plate. A second brush holder component is also provided which is mechanically coupled to the first brush holder component and is decoupled in a vibration-neutralizing manner from the first brush holder component via at least one damping element and which holds brushes via which contact can be made with a commutator of the motor.

Abstract: A motor includes a fixed portion, a rotor, and at least one balancing plate fixed on the fixed portion. The fixed portion includes a stator having at least one pole plate that extends to form a plurality of pole faces, with a gap being defined between a pair of the pole faces adjacent to each other. The rotor includes a shaft and an annular magnet facing the pole faces. The balancing plate includes at least two magnetically conductive faces respectively aligned with the gaps. Each magnetically conductive face includes a length not smaller than that of an associated gap. The pole faces face at least one face of the annular magnet. When the rotor turns, the annular magnet of the rotor induces the alternating magnetic fields created by the stator and attracts the magnetically conductive faces to thereby maintain rotational balance of the rotor.

Abstract: An electric appliance has a first terminal and a second terminal electrically connected to the first terminal. The first terminal has a soldering portion for soldering the second terminal thereon. The soldering portion has a smooth face and a rough face disposed on one imaginary plane. The rough face has a flat portion and a plurality of concavities disposed on the flat portion at intervals. Further, the soldering portion may have a through hole adjacent to the rough face to insert the second terminal. The first terminal is embedded in an insulator. The insulator has an opening exposing the soldering portion therein. The insulator includes a frame forming a housing of an electric appliance. A seal seals a connection gap at a margin of the frame in the housing. A partition wall may be disposed between the soldering portion and the seal.

Abstract: A motor includes a fixed portion having a stator with at least two pole faces. Each pole face includes a strong magnetic section and a weak magnetic section for respectively creating stronger and weaker alternating magnetic fields. A rotor includes a shaft rotatably extending through the fixed portion and an annular magnet mounted to an inner periphery of the rotor and facing the pole faces of the stator. At least one magnetically conductive balancing portion is mounted on the fixed portion and includes at least two magnetically conductive faces that are respectively aligned with the weak magnetic sections and that face at least one face of the annular magnet. When the rotor turns, the annular magnet of the rotor induces the stronger alternating magnetic fields and the weaker alternating magnetic fields and attracts the magnetically conductive faces to thereby maintain starting stability and rotational balance of the rotor.

Abstract: The invention relates to a fixing unit comprises a multi-part, electrically conductive base body provided with connections for the electric power supply of the electrically conductive basebody and additional connections for the electric motor and which is arranged in an electrically non-conductive support comprising at least two fixing holes. The multi-part, electrically conductive base body and the electrically non-conductive support are provided with a common recess.

Abstract: An automotive alternator includes a rear frame having a rear end wall and a cover member covering a brush device. The cover member is connected to the rear end wall of the rear frame, and a vibration-absorbing member made of a rubber material is disposed between the rear end wall and the cover member. The vibration-absorbing member has a cylindrical portion disposed between a center opening of the rear end wall and an extending portion of the cover member and a rear disc portion disposed between the rear end wall and a front surface of the cover member. The cylindrical portion is compressed in the radial direction while the rear disc portion is compressed in the axial direction, thereby alleviating vibration of the brush device in both the radial and the axial directions.

Abstract: A fastener assembly includes a grommet, a dampening subassembly, and a pin. The pin is secured to the grommet and the dampening subassembly. The pin is configured to rotate between a locked position and an unlocked position with respect to the grommet. The pin secures to the grommet in the locked position, and is removable from the grommet in the unlocked position.

Abstract: A resilient isolation member is configured for use with an electric machine having a housing, a stator within the housing, and an end shield. The resilient isolation member includes first and second end portions, a sidewall extending between the first and second end portions, and a lip is disposed along an outer surface of the sidewall. The resilient isolation member is sized for mounting between the end shield and the stator, with the first and second end portions respectively abutting against a first inner portion of the end shield and a portion of the stator and with the lip abutting against a second inner portion of the end shield and a portion of the housing.

Abstract: The present invention provides a positioning mechanism and an exposure apparatus that can be used in a vacuum ambience and has a damping function with small degassing and small dust creation. A positioning mechanism according to the present invention, when used with first and second members, serve to position the second member with respect to the first member, wherein the positioning mechanism include a positioning portion capable of relatively positioning the second member relative to the first member, and an attenuating material provided at least at a portion of a periphery of the positioning portion.

Abstract: The invention relates to an electrically driven flow compressor comprising a drive (2, 3)—and a flow compressor and a converter (5) for electrical supply and control of the drive unit (2, 3).According to the invention, the converter (5) and the drive unit (2, 3) form an integral arrangement. Said inventive flow compressor has a reduced size, excellent electromagnetic performance and reduced production costs compared to flow drives with an external frequency converter.

Abstract: A motor device capable of reducing cogging torque includes a stator assembly and a rotor assembly, which is movably disposed in the stator assembly. The rotor assembly provides a magnetic component. The stator assembly further includes an insulation frame part, a set of silicone steel sheets and a coil winding the insulation frame. A plurality of circular strip members are disposed at the circumferential side of the bottom of the stator assembly in a way of the respective circular strip member has an end thereof being attached to the bottom of the insulation frame part and another end thereof extending circumferentially to the sector shaped space. Further, the circular strip members space apart from each other without contacting the silicone steel sheets.

Abstract: An external rotor motor is disclosed, which features a stator (11) and a rotor (13) surrounding the stator (11) while leaving an air gap. A damper (16) made of an elastic material is arranged on the outside of the rotor (13) in order to dampen resonant rises in airborne sound, which is emitted by the rotor of the external rotor motor and by an assembly coupled to it. In the case of a rotor (13) that is designed to be pot-shaped, the damper (16) is preferably embodied as a damping cap (17), which surrounds the pot jacket (132) and at least partially covers the pot base (131) (FIG. 1).

Abstract: Structure of driving unit in a drum type washing machine including a tub mounted inside of a cabinet, a drum mounted inside of the tub, a shaft connected to the drum mounted inside of the tub for transmission of a driving force from a motor to the drum, a front bearing and a rear bearing mounted on an outer circumference of the shaft at opposite end portions thereof respectively, a bearing housing built in a central portion of a rear wall of the tub for supporting the front bearing, a rotor composing the motor together with the rotor, and coupled to the rear end portion of the shaft, a stator fixed to the tub rear wall inward of the rotor to compose the motor together with the rotor, a connector serration coupled to the outer circumference of the shaft in front of the rear bearing and fixed to the rotor, for transmission of a rotating power from the rotor to the shaft, and a bearing bracket fixed to the rear wall of the tub to cover an outside of the rotor and support the rear bearing, thereby reducing noise,

Abstract: The invention relates to a drum drive that delimits an interior space intended for receiving an electromotor for producing a rotating movement of the drum. The electromotor comprises a stator, shell and stator cap. The stator is turnably journalled about the shaft (7), wherein the drive comprises at least one damping device (10) connected to the shaft (7) and to the stator, and extending radially from the shaft in a plane that is essentially at right angles thereto; and wherein the damping device (10) is configured for absorbing forces that strive to rotate the stator about the shaft.

Abstract: A method for centering and securing data storage disks to the hub of a spindle motor in a hard disk drive has a chamfer and a countersink on the top of the spindle motor shaft center. During the hard disk drive assembly process, a disk centering tool engages and uses these features to locate and center the disks that are installed on the spindle motor. The features are closely toleranced to provide a very precise centering feature for mounting and aligning the media disks with respect to the hub and the spindle motor. The present design reduces the complexity of the tooling and fixtures required to complete the assembly. As a result, the overall part cost is reduced and the manufacturing yield is improved.

Abstract: A power tool is provided including a resilient boot having a radial flange mounted in a seat formed by housing halves in order to provide a sealed barrier segregating air of an inlet vent of a motor from air of an exhaust vent and the boot also mounting the motor and providing vibration dampening between the motor and the housing halves. The boot and housing also include wire management slots and the boot absorbs tolerance stack-up of components and provides shock absorption when the power tool is dropped.

Abstract: A rotary electric machine comprises a rotating shaft 7 rotatably supported by bearings 2, 3, a rotor 23 attached integrally with the rotating shaft 7, and a stator 5 arranged facing the rotor 23. The stator 5 includes a plurality of coils arranged substantially in a circular (annular) form in a rotating direction of the rotating shaft 7. The rotor 23 includes a circular-disc rotor yoke 26 made of a ferromagnetic material, such as iron. Depressed portions and raised portions 28 on a surface of the rotor yoke 26 facing the stator 5, except for the center portion, are arranged in a circumferential direction of the rotor yoke 26. N-pole magnets 29 and S-pole magnets 30 are alternately arranged in the depressed portions 27. Therefore, in addition to torque generated by the magnets 29, 30, reluctance torque is generated between the raised portions 28 on the rotor yoke side 26 and the teeth on the stator side 25, thus making it possible to increase the range of rotation speeds of the motor.

Abstract: A rotator supporting mechanism in a microgravitational rotating apparatus includes a magnetic bearing of the rotator so as to effect a vibration control. Recess portions 10a, 10b are provided in a casing 10. Coils 1, 2 of the magnetic bearings 11, 12 and vibration sensors 3, 4 are arranged in the recess portions 10a, 10b being fitted to the casing 10 side. A rotary shaft 30 has its upper end inserted into the recess portion 10a and its lower end inserted into the recess portion 10b and connected to a motor 13. Both ends of the rotary shaft 30 are supported by a magnetic force. Arms 24–27, extending horizontally along X and Y axes, each have one end fitted to the rotary shaft 30 and the other end fitted with experimental boxes 20–23. Objects such as plants and animals, etc. are placed in the boxes 20–23 and, while they are rotated in space, experiments are performed.

Abstract: A stator having an armature winding and a rotor having a field winding are contained in an alternator housing. A cooling fan is connected to at least one axial end of the rotor, and a plurality of windows are formed in an axial end wall of the housing to face the cooling fan. A shroud surface facing the cooling fan is formed at a radial outside of each window. The opening of the window is so made that it gradually decreases along a rotational direction of the cooling fan, while the shroud surface area gradually increases along the same direction. In this manner, pressure changes in a space between the fan blades and the fan shroud are smoothened, and thereby noises generated by the cooling fan are effectively reduced.

Abstract: A box unit is a housing having a space for containing a circuit board therein. Bus bars are insert-molded in a resin body of the box. A metal shield plate is insert-molded around the entire periphery of the box and outside the bus bars. As a result, the box has a shield and is reduced in size compared with a metal box.

Abstract: A base plate for a spindle motor is provided defining a minimal axial gap with a relatively rotatable magnet. In an example, a surface of the base plate is positioned at 0.1 mm from an adjacent surface of a relatively rotatable magnet. The base plate is comprised of a composite material such that stiffness is improved and acoustic vibration is reduced, while maintaining low power consumption and a fast start-up time. A first material, being a nonmagnetic material is employed adjacent to a motor magnet, and a second material having a preferred stiffness is employed at a greater radial distance from the magnet than the radial distance between a stator and the magnet.

Abstract: A boot for a vibration motor of a mobile communication device is provided. The motor has a generally flat upper surface and is adapted to be installed in a mounting slot in a mobile communication device frame with the upper surface substantially parallel to an adjacent surface of said frame, and the mounting slot is at an angle with respect to a normal of the adjacent surface. The boot has an outer surface corresponding to the shape and angle of said mounting slot, an exposed surface generally parallel to said adjacent surface, and a motor-receiving slot for receiving said vibration motor, the motor-receiving slot having an axis angled from an axis of the mounting slot and generally normal with respect to the adjacent surface.

Abstract: A support system, a bracket assembly, and a damping member for use in supporting a rotating shaft. A support system including a fixed bracket; a bracket assembly; and a bearing. The bracket assembly having a first damping member having a first fixed end and a second movable end, the first fixed end being securably attached to the fixed bracket and the second movable end being movable in a first plane aligned with the shaft. The bracket assembly further having a brace securably attached to the second movable end of the first damping member. The bracket assembly further having a second damping member having a first end and a second end, the first end being securably attached to the brace and the second end being movable in a second plane that is aligned with the shaft and is generally perpendicular to the first plane.

Abstract: Disclosed is a motor supporting apparatus of a clothing drier comprising: first and second motor hubs respectively protruding at both sides of a motor; a supporting rib formed at a case for supporting the first motor hub; and a supporting member assembled at a lateral surface of the case by a sliding method for supporting the second motor hub. The apparatus simplifies assembly processes, enhances a mass production characteristic, and simplifies a service performance by improving a motor supporting structure and thereby enabling assembly/disassembly of a motor without disassembling a drum.

Abstract: A commutator includes a generally cylindrical dielectric body and a plurality of commutator segments arranged along an outer peripheral surface of the dielectric body. Each commutator segment includes a ridge, which extends in a direction generally parallel to an axial direction of the commutator and radially inwardly projects into the dielectric body to secure the commutator segment relative to the dielectric body. Each ridge includes alternately arranged high projecting portions and low projecting portions. Each high projecting portion includes grooves, which are obliquely angled relative to the longitudinal direction of the ridge, and protrusions, each of which is bound with one of the grooves and protrudes in an imaginary plane generally perpendicular to the projecting direction of the ridge.

Abstract: Superconducting electrical machines, for example motors or generators, especially high-temperature superconducting machines, include a rotor equipped with superconductors, especially high-temperature superconductors. They further include a rotor cryostat, a rotor shaft and a cryostatic link including a cryostatic conductor between the cryostat and a frigorific apparatus, and a non-superconducting stator. The machines are adapted to be resistant to shocks as required for navy ships. The stator, the rotor and the cryostat are motion-decoupled from an outer machine housing and the rotor shaft by elastic elements. In one embodiment, the machine housing is configured as a thruster housing and is elastically linked with the stern of the ship.

Abstract: An electrical actuator has a DC motor which is provided with a rotor having a permanent magnet for forming a plurality of magnetic poles around a periphery thereof and a stator having a plurality of energizing coils and being disposed around a periphery of the rotor to thereby generate a rotary force for the rotor. In mounting this DC motor on a heat-generating member which generates radiant heat, a member for shielding radiant heat from a heat-generating member is disposed between the DC motor and the heat generating member. In this manner, the radiant heat from the heat-generating member is prevented from reaching the DC motor, whereby the problems in the DC motor associated with the radiant heat can be prevented.

Abstract: The disclosure describes a DC motor including a rotor unit arranged within the motor body and has a cylindrical field magnet fixed to an outer surface of a holder. The holder has a rotating shaft press-fitted through the center, and the cylindrical field magnet has the S and the N poles alternately around a circumference. There is a stator unit which is circumferentially arranged around the rotor unit, that is made of a plurality of stator yokes that are arranged so that they oppose the field magnet through a small gap. Each of the stator yokes is formed by circumferentially stacking a large number of thin plates, each consisting of a salient pole, and a number of coil units, each formed by winding a magnet wire on a bobbin, and mounting the bobbins on the stator yokes. In the described arrangement, each of the S and N poles has a plurality of stages formed in an axial direction and shifted from each other in the circumferential direction by a predetermined shift amount with respect to the field magnet.

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.