Abstract: An electrically conductive enclosure shield is disposed between a rotor enclosure and the rotor winding assemblies. The shield reduces transverse shear loads generated by non-uniform centrifugal radial forces in a generator rotor, while providing adequate electromagnetic shielding for the field winding. Ventilation holes in the shield enable ventilation gas discharge, and shallow ridges may be provided that serve as axial positioning guides for enclosure rings. Additionally, the enclosure shield advantageously adds axial stiffness to the rotor.

Abstract: The armature (26) has metal segments (42) separated from each other by grooves (46) distributed around its circumference on a front side thereof. Commutator covers (48) are placed on the segments (42) and soldered with the segments (42) in order to form the plane commutator (32). The commutator cover (48) has respective recesses (50) in its front side facing the metal segments, which correspond in their size and shape at least approximately to the segments (42). When the commutator cover (48) is assembled in the armature each segment (42) is inserted in a corresponding recess (50) of the commutator cover (48) and is soldered in the recess (50). Side surfaces of the segments (42) facing in the circumferential direction and edge surfaces pointing radially inwardly are covered by the commutator covers (48). The commutator covers (48) are positioned exactly by the metal segments (423) inserted in their recesses and are separated from each other by comparatively small slots (56) in the armature.

Abstract: A motor armature having a simplified assembly comprises an inner cylinder and an outer cylinder arranged coaxially, and a plurality of pole pieces provided radially at equal intervals between the inner and outer cylinders. The inner cylinder is formed into a cylindrical shape by curling up in the longitudinal direction a first hoop member (band steel) formed of a magnetic material and having a predetermined thickness and length. The outer cylinder is formed of a second hoop member similar to the first hoop member. The pole pieces each comprise a wire piece cut from a wire formed of a magnetic material and having a coil would thereon. One end of each pole piece is welded to one of the hoop members and the other end of the pole pieces is welded to the other hoop member.

Abstract: The present invention provides a structure of a rotor for a generator in which a rotor capable of being ground very easily with a high accuracy is incorporated. This structure of a rotor comprises a rotor mounted fixedly on a rotary shaft supported rotatably on housings. The rotor comprises cylindrically arranged members in which segmental members of permanent magnets are assembled together cylindrically, and an outer cylinder provided on an outer circumference of the cylindrically arranged members and comprising windings or woven cloths of fibers. A resin material capable of being ground is packed in clearances between the cylindrically arranged members and outer cylinder and in the clearances in the outer cylinder.

Abstract: A rotor structure for a motor includes a rotor body having two sides, two sun plates each attached to one of the two sides of the rotor body and each having a copper wire wound thereon, and two end caps each secured to a corresponding one of the two sun plates and each enclosing the copper wire therein. Each of the two end caps includes a plurality of plugs each inserted into the respective sun plate for securing the end cap to the respective sun plate.

Abstract: A motor for an electric power steering assembly comprises permanent magnets constituting four or more poles secured to the inner wall of a yoke, a shaft disposed inside the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding composed of wiring wound by a lap winding method into slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of commutator segments secured to an end portion of the shaft, brushes disposed singly on the positive side and the negative side of the commutator so as to contact the surface thereof; and equalizing connectors connecting commutator segments which should have the same electric potential to each other.

Abstract: An armature for an electric motor is constructed from a pair of precision machined copper plates cut in a pattern to produce a series of axially extending surface conductive bands with each band separated from the other by an insulated cutout. The precision machined plates are rolled to form two telescoping, hollow cylinders with each cylinder having a pattern of conductive bands representing a half-electric circuit. The outer surface of the inner cylinder is wrapped with several layers of fiberglass strands for structural stability and insulation. The fiberglass wrapped inner cylinder is telescoped inside the outer cylinder. The outer surface of the telescoped structure is also wrapped with several layers of fiberglass strands for structural stability. The conductive bands from the outer cylinder being the near mirror image of the conductive bands of the inner cylinder are helically coupled to form a complete electrical circuit.

Abstract: A canned motor includes a rotor having a rotor core and a rotor can covering an outer circumferential surface of the rotor core, and a stator fixedly disposed around the rotor with a radial gap defined therebetween and having a stator core and a stator can covering an inner circumferential surface of the stator core. The rotor core has at least one groove defined in an outer circumferential surface thereof and extending longitudinally thereof. The rotor can has a portion pressed into the groove and held in intimate contact fully with the outer circumferential surface of the rotor core.

Abstract: A method of joining a magnetic armature of an electromagnetic actuator to a shaft is provided. The armature has an aperture therein. The method includes inserting a portion of the shaft into the aperture thereby defining a space between the shaft and the armature. Brazing material is placed adjacent to the aperture. The brazing material is caused to melt and wick into the space. The brazing material is permitted to cool to define a joint between the shaft and the armature.

Abstract: A synchronous machine, in particular a generator for a vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles excited by at least one common excitation coil, in which for compensation of a magnetic stray flux, in the free spaces between the axially oriented claw poles permanent magnets are inserted at the axial ends of the pole plates of the rotor, so that the permanent magnets are supported by a holder against centrifugal forces and held by it, and therefore an especially simple and inexpensive holder is formed which considerably simplifies and facilitates the insertion of the permanent magnets.

Abstract: A synchronous machine, in particular a generator for a motor vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles which are excited by at least one common excitation coil, wherein for compensation of a magnetic stray flux, permanent magnets are inserted in free spaces between the axially oriented claw poles on the pole plates mounted on the axial ends of the rotors, and the permanent magnets are supported by a holder against centrifugal forces, so that the insertion of the permanent magnets is simplified and facilitated by a simple and inexpensive holder which reduces parts and mounting expenses.

Abstract: In the motor armature arrangement according to the present invention, because the inner diameter (D2) of one of the axially end portions (3c) of the armature shaft (3) is reduced from the inner diameter (D1) of the motor core mounting portion (3b), the one axially end portion (3c) for mounting a bearing (8b) may be provided with a large wall thickness so that a sufficient mechanical strength can be achieved for the part for mounting the bearing without increasing the outer diameter thereof.

Abstract: A miniature motor with a two-pole stator, and a rotor having three or more salient poles each having a core with flanges extending toward both sides thereof and a winding. The rotor is adapted to simulate a two-pole construction by cutting off at least the tip of a flange on either side on a part or all the salient rotor pole cores, thereby limiting the spontaneous-stop angular positions of the rotor to two. One insulating spacer is provided between a plurality of commutator segments of the commutator in such a positional relationship as to come in contact with one of the two brushes when the rotor is at a spontaneous-stop angular position. The motor is prevented from burning and restarting suddenly after a stop since the motor has a self-inactivating function by interrupting current supply at spontaneous-stop angular positions while maintaining motor torque by minimizing the angle of non-conduction to the rotor.

Abstract: An armature coil is formed by welding upper and lower coil conductors each having a coil trunk, a pair of coil arms and a pair of coil extensions. Between an upper coil extension and a lower coil extension to be welded together, a recess is formed. This recess may be formed at the corner between a side face of an upper coil arm which is at the side of the armature core and a radially inner side face of the upper coil extension. The radially inner side face of the upper coil extension has a space against the radially outer side face of the lower coil extension only at the location where the recess is provided, while the radially inner side face except for the recess contacts the radially outer side face of the lower coil extension.

Abstract: In a switched reluctance motor, the projected poles of a rotor have feeble-magnetic portions each having a shape that extends radially inward approximately in the rotational direction from a position relative close to a radially outer end of the projected pole and to an end of the projected pole facing in a counter-rotational direction, that is, a direction opposite to the rotational direction, or a shape that has a side extending radially inward approximately in the rotational direction from a position relatively close to a radially outer end and an counter-rotational direction-facing end of the projected pole and that extends radially inward approximately in the counter-rotational direction. The feeble-magnetic portions are weaker in magnetism than the material of the rotor and reduce the magnetic attraction force occurring at the time of switching of coil energization, thereby reducing noises while ensuring generation of a desired amount of torque.

Abstract: A rotor (10) includes a plurality of permanent magnets (14) disposed around a shaft (12) at generally equal intervals, and a plurality of laminated core members (16) disposed between the permanent magnets (14) so as to form magnetic poles. The laminated core members (16) are formed by stacking a plurality of core-laminations (26) made of magnetic materials and an integral core-lamination, and joining them to each other. The integral core-lamination includes a plurality of core-lamination sections each having a shape the same as that of the core-lamination (26), and connecting portions (46) for connecting adjacent core-lamination sections with each other.

Abstract: An efficient permanent magnet rotor for a brushless motor has a yoke (2) formed by laminating many steel sheets (4) so as to provide an even number of magnetic poles projected externally, filed permanent magnets (3) inserted in the magnetic poles, bridges (10) provided at either end of the permanent magnets and having a width, among a first minimum width below which said bridges cannot be punched out without breaking, a maximum width at which an allowable maximum number of magnetic fluxes passes through said bridges, and a second minimum width below which said bridges cannot withstand a centrifugal force caused by rotation of said permanent magnet rotor, (1) equal to or larger than the greater one of the first and second minimum widths and smaller than the maximum width when the first and second minimum widths are equal to or smaller than the maximum width, or (2) equal to or larger than the greater one of the first and second minimum widths when said greater one of the first and second minimum widths is equa

Abstract: A rotor for an induction motor includes a core having a central hole extending axially therethrough for receiving a shaft. A plurality of large spaces are formed in the core radially outside of the center hole. The spaces are filled with a non-ferrous metal, and blowholes extend through the non-ferrous metal for conducting cooling air through the core.

Abstract: A DC brushless motor 3 is provided which comprises armature 31 and rotor 32. Rotor 32 is provided with a rotor yoke that has four main poles 321 on its periphery. Slots with a radial-direction size of L.sub.m are formed on main poles 321 of the rotor yoke. Magnetic-field permanent magnet 323 with an approximate thickness of L.sub.m is embedded in each slot 322, such that the radial-direction size L.sub.m of slot 322 and the air gap length L.sub.g of the air gap formed between rotor 32 and armature 31 satisfy the relationship 0<L.sub.m +L.sub.g .ltoreq.2 mm.

Abstract: A rotor with permanent magnet capable of fixing permanent magnets on the rotor iron core by a simple method. This rotor with permanent magnet comprises; a rotor iron core in which rotor iron plates provided with plural recessed portion in trapezoidal form at suitable intervals are formed in stacked manner on the outer circumference, fitting grooves comprised of continuity of the recessed portions on the outer circumferential surface thereof; a pair of end plates provided at respective end surfaces of the rotor iron core; fixing members formed by non-magnetic material, the fixing members being inserted into the respective fitting grooves to form a plurality of areas partitioned by the outer circumferential surface of the rotor iron core along with the end plates; and a plurality of permanent magnets fixed in the respective areas between these fixing members.

Abstract: A squirrel cage type electric motor rotor assembly includes first and sec end plates of circular configuration, rigid tubes extending from the first plate to the second plate, the tubes being closed at either end thereof to define enclosed chambers therein, and granules of magnetic material disposed in the chambers, the granules being packed therein with a density leaving them readily movable to align with magnetic fields.

Abstract: An electric disk armature machine is disclosed which comprises a drive shaft for the transmission of power from and to the rotor of an electric disk armature machine and which has at least one driver disk vertical to the shaft axis for a positive and/or frictional connection with the rotor. The rotor is a self-supporting construction of a plurality of plate-like coil elements which are distributed along the circumference and which are interconnected radially outside and radially inside so as to conduct. The commutator is formed by an annular portion of one end side of the rotor and an insulating layer is arranged between the rotor and the drive shaft. The electric disk armature machine also comprises a rotor which contains a plurality of current conducting coil elements which are turned relative to one another in their radial angular position and which are insulated relative to one another and arranged in one or more different planes vertical to the rotor axis.

Abstract: The present invention provides for an electromechanical transducer for producing sound in response to an audio signal. The transducer has a generally rectangular enclosure, a diaphragm, a cylinder, a drive shaft, a lever means, and a motor means. The diaphragm is associated with the cylinder. The outer diameter of the diaphragm is substantially similar to the inside diameter of the cylinder. The diaphragm is slidably associated with the cylinder. The motor has the characteristic of rotating in response to the application of electric current from an audio source. The characteristic of rotating is limited to an arc having an angle of less than 180 degrees. Thus the motor can make only fractional rotations upon the application of electric current. A method for producing sound in response to an audio signal is also provided.

Abstract: Stacked wheels of the rotor of a rotary machine are axially coupled to one another by tie bolt assemblies. Each tie bolt assembly includes a stud having externally threaded opposite ends. A forward end of each stud is threaded into a non-rotatable windage nut. The aft end of each stud is secured by a primary nut having a plurality of facets, a jam nut locked against the primary nut and an anti-rotation cover between the jam nut and primary nut. The anti-rotation cover includes wings engaged against a next-adjacent wheel, preventing rotation of the cover relative to the rotor. Internal surfaces of the cover have facets greater in number than the number of facets on the primary nut whereby fine clock orientation of the cover relative to the adjacent wheel is obtained. The cover and primary nut are thus locked against rotation, thereby locking the stud/nut assembly against rotation relative to the rotor.

Abstract: An apparatus for generating electrical energy includes at least one fixedly mounted stator having a generally cylindrical cross-section and further including an inner periphery and an outer periphery. The apparatus additionally includes a rotor which is mounted for rotation relative to the stator about an axis. A plurality of field windings is mounted to the stator to extend about its periphery preferably in a serpentine manner. Further, the apparatus includes first and second groups of permanent magnets. The first group of permanent magnets is mounted to the rotor and is axially arranged about the axis such that the first group of magnets faces the inner periphery of the stator. The second group of magnets is mounted to the rotor and is arranged about the axis such that the second group of permanent magnets faces the outer periphery of the stator.

Abstract: A stator wound resolver comprising: a stator and a rotor aligned on an axis; the stator having a plurality of teeth with input and output windings disposed on some or all of the teeth, the input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about the axis; the input winding being connectable to a drive signal and the output windings being disposed on the teeth such that output signals induced in the output windings correspond to position of the rotor; the rotor being attachable to a position changing means, the rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle such that a portion of harmonic distortion produced by one of the rotor pieces is reduced by complementary harmonic distortion produced by another of the rotor pieces.

Abstract: A switched reluctance motor has a rotor disposed in an annular stator and formed mainly of a stack of iron plates. The rotor has pole protrusions that face the stator. The pole protrusions have weak magnetic portions provided therein. Each weak magnetic portion has a shape elongated from a leading outer point to a tailing inner point, or a shape that has a base side extending a leading outer point to a tailing inner point and that extends from the base side in the rotational direction and in the inward radial direction. The weak magnetic portions are formed of a material that has a weaker magnetism than the materials forming the other portions of the rotor.

Abstract: A three-phase reluctance type motor flat in shape and capable of generating a large output torque and rotating at high speeds, comprising a flat stationary armature (16) having a circumferential surface provided with three multiplied by integral number of magnetic poles wound by first, second and third phase armature coils, salient poles of a magnetic rotor (1) fixed to the inside of the outer periphery of a cup-shaped rotor (3), and a current supply control circuit for obtaining first, second and third phase position detecting signals responsive to the position of the salient poles and for quickly supplying current to the first, second and third phase armature coils based on these position detecting signals, so as to realize a high-speed rotation.

Abstract: One aspect of the invention is a rotor core for use with a permanent ring magnet in an electric motor which serves to minimize and evenly distribute thermal stresses in the rotor without undermining the efficiency of the motor by distorting the flux return to the ring magnet. According to one embodiment, the rotor core comprises a plurality of laminated plates. Each of the plates has a rim with a circular outer perimeter, a hub concentric with the outer perimeter of the rim, and first and second sets of curved spokes coupling the hub to the rim. Each spoke of the first set of curved spokes is concave in a clockwise direction and each spoke of the second set of curved spokes is concave in a counter-clockwise direction. According to another embodiment, the rotor core comprises a plurality of laminated structurally-identical perforated plates having obverse and reverse sides such that the obverse side of each plate faces the obverse side of an adjacent plate.

Abstract: An axial gap rotary electric machine in which the conduction path design for disc-shaped armatures is specifically matched to the configuration of the axial magnetic field. The design achieves an axial gap rotary electric machine which is light in weight and capable of high power density per unit weight. The design can be used as an electric generator or an electric motor.

Abstract: A two-speed direct-current electric motor with a high-speed rotation switch activated by a vehicular sensed parameter signal. The motor includes a motor shaft supported by at least one bearing for rotation, at least two sets of windings supported by the shaft, a contactor arrangement supported by the shaft to electrically couple the windings in first and second configurations based upon a sensed parameter signal having at least a first and a second state, and a commutator arrangement coupled to the contactor arrangement to apply electrical energy to the windings. The motor rotates at a first speed when the windings are coupled in the first configuration and rotates at a second speed when the windings are coupled in the second configuration. The high-speed rotation switch is coupled directly to a sensed parameter signal and is integral to the electric motor.

Abstract: An armature assembly 50 for an electric motor 10 is inherently balanced despite the presence of a secondary shaft 74 extending from a primary armature shaft 72 longitudinally along an eccentric axis 75 offset radially from the longitudinal axis 15 of the primary armature shaft 72. A lamination stack 60 mounted on the armature shaft 70 is formed of a plurality of lamination plates 62 arrayed in abutting face-to-face relationship. The lamination plates 62B and 62C provided at the respective ends of the stack 60 are modified in that some of the radially directed spokes 66 are removed along a selected portion or spaced portions 63,67 of the circumferential extent of the hub portion 64 so as to provide counterweight lamination plates having a spoke pattern which is not symmetric about the longitudinal axis 15 of the primary shaft 72.

Abstract: A rotary generator comprises a rotor within a stator having end windings, the rotor defining a flow path for cooling fluid which, during rotation of the rotor forms an annular layer in the rotor. A cooling fluid feed means is provided having an inlet which, in use, is positioned within the annular layer of cooling fluid whereby a head of cooling fluid is formed at the inlet. The feed means defines a duct through which the cooling fluid passes by the action of centrifugal force towards an outlet from which cooling fluid is directed onto the end windings. The rotation of the rotor causes the head of fluid at the inlet to reduce with increasing rotational speed thereby effecting control of cooling fluid flow through the feed means as the rotational speed of the rotor increases.

Abstract: An armature for a fractional horsepower motor is provided with spiders 10A having spokes 20 and arms 24. The spiders 10A fit at at least an end of laminated armature stacks around which the armature windings are wrapped. The spokes 20 are profiled to provide upstanding rounded surfaces 23 for the windings and to reduce drag. Reduction in drag and the profiled shape of the spokes 20 improves air flow through the motor and reduces the tendency of build up of carbon dust in the region of the extremities A of arm of the laminated stack as well as reduce motor noise in use.

Abstract: An armature for an electric motor has an improved integrated armature coil body. The integrated armature coil body includes an annular and substantially flat portion projecting a minimum distance beyond one end of an armature core, the annular portion being defined by curved connecting portions of separate winding wires arranged and disposed substantially in the Archimedes' spiral relationship about the center of the armature core. Each of the winding wires has first and second straight portions extending from the curved connecting portions through different slots in the armature core and connected to a commutator at the other end of the armature core. Each wire has two curved connecting portions, one overlying the other curved connecting portion of a plurality of other wires.

Abstract: A method of winding a motor armature includes providing a sub-assembly comprising a shaft having an armature core and a commutator mounted thereon, the commutator having commutator bars spaced apart about the shaft with each bar having leading and trailing wire connection devices angularly spaced apart with respect to said shaft. A first wire is connected to a leading wire connection device and a second wire is connected to a leading connection device on the other side of the commutator. The successive coils are separately wound on the armature core from the first and second wires with connection of each wire to a different leading connection device between successive coils. Thereafter further successive coils are separately wound on the core from the wires but now with connection of the wires between successive coils to trailing connection devices until the commutator bars have pairs of electrically parallel coils connected thereto.

Abstract: An electric motor which achieves reduced axial height by an arrangement of a motor case which mounts an outer field magnet and which also rotatably supports a motor shaft. A cup shaped yoke fixed to the shaft supports a rotor core and coil. A commutator is mounted on the yoke and is contacted by brushes fixed to a resin member embedded in an aperture formed in the motor case.

Abstract: A cross flow type cooling fan device installed in the internal part of electric appliances which need cooling such as audio-amplifiers, microcomputers, word processors, copying machine, etc. The cross flow type cooling fan device is characterized in that an impeller (107) with air blowing slits formed around a hollow area in the center of a cylindrical body is rotatably supported by supporting frames (109, 110) at the ends thereof through supporting shafts (111, 112), a field magnet (121) is mounted either on a rotary side formed by the impeller (107) or the supporting shafts (111, 112) or on a stationary side formed by the supporting frames (109, 110), and an armature winding (124) is mounted confronting the aforesaid magnet for the motor, so that a rotary driving section of the impeller is constructed resulting in a cooling fan device of considerably reduced size.

Abstract: An electrical machine is disclosed, capable of functioning as either a motor or generator, which has a salient pole rotor (23) and a stator having multiple phase windings (21) each comprising a concentrated, full pitch winding with one stator slot per pole per phase. The pole faces (27) of the salient poles of the rotor may be tapered to produce an air gap which increases from the front to the back of the pole face to counter the effect of armature reaction MMF. The taper of the pole faces is selected such that the resultant total flux density in the air gap from field and armature currents is quasi-rectangular. The quasi-rectangular flux densities rotating in the air gap produce quasi-rectangular phase voltages and currents when the machine is operated as a generator, and, when operated as a motor, the machine is adapted to accept quasi-rectangular supply currents or voltages of the type readily produced by variable frequency converter power supplies.

Abstract: A laminated rotor for a dynamoelectric machine is formed by stacking a plurality of sets of punched laminae on one another to define axial coolant passageways, radial vents and coolant ducts and axial conductor-receiving slots through the assembled rotor. Each of the sets of laminae include a group of main rotor laminae, a group of vent laminae, a group of duct laminae and a transition lamina positioned between the vent laminae and duct laminae. In addition, a transition lamina is positioned between each set of stacked laminae thereby to arrange one transition lamina on opposite sides of each group of duct laminae, to effectively block molten metal from flowing out of the conductor slots into the coolant ducts of the duct laminae.

Abstract: An armature lamina for a dynamoelectric machine characterized by having a plurality of equally spaced winding slots formed around its periphery so that the winding-receiving gap, or mouth, of each slot is positioned near one side thereof, rather than being positioned at the center of the slot. In a preferred embodiment, the winding slots are divided into groups such that half of the slots have their respective mouths positioned adjacent the leading slot side while the remaining half of the slots have their respective mouths positioned adjacent the trailing slot side. This characteristic off-centered arrangement of the respective slot openings enables a maximum number of energizing windings to be positioned in each slot when the laminae are stacked on a spindle and wound with coils of insulated magnet wire to form a random wound armature. Alternative embodiments are provided for short pitch and double fly wound machines.

Abstract: An electric motor of a construction, wherein conductive wires are wound around the outer periphery of an armature core substantially in parallel with a rotor shaft and in such a manner that the terminal connection part of the winding may be provided in the axial direction of the rotor shaft, and, at the same time, a commutator is disposed inwardly at a position nearer to the core than the projected end of the terminal connection part of the winding which projects outwardly in the same direction as the axial direction of the core, whereby the length of the rotary armature in the axial direction thereof is shortened to flatten the motor per se in the axial direction thereof.

Abstract: In an alternating current dynamoelectro machine, the rotor core and/or stator core are axially divided into a plurality of blocks, adjacent blocks of the rotor core and/or those of the stator core are fixed to the rotor shaft and to the motor frame, respectively, at different positions on circumference of respective blocks, whereby an interactive vibration energy between the blocks is absorbed by relative vibrations produced between the adjacent blocks so that vibrations and noises of the machine can be reduced.