Abstract: In an electric motor comprising a rotor, a stator, a stator core that constitutes the stator, a core section that constitutes the stator core, a plurality of split core blocks which constitute the core section, and a metallic connection housing that connects the split core blocks in dovetailed form to create one connected core section, the split core blocks are each formed of a laminated steel plate, in that the connection housing is formed of a material softer than the laminated steel plate, and the dovetailed connections at the connection housing are plastically deformed to remove the connection gap existing at each of the dovetailed connections.

Abstract: There is provided a stepping motor of low vibration realized by reducing cogging with a simple structure while maintaining the performances such as torque.

Abstract: A motor main body includes a brush holder, which supports a plurality of power supply brushes and includes a motor-side connector to be connected with an external connector. A circuit board is installed to the brush holder in a direction perpendicular to an axial direction of a rotatable shaft to electrically connect between the motor-side connector and the power supply brushes. The circuit board is received in the circuit board receiving portion when the motor main body and a speed reducing unit are assembled together to form an electric motor.

Abstract: A stator core is prepared into a cylindrical shape by abutting four arc-shaped laminated core divisions and welding an outer surface and an inner surface of the abutted portions. Each of the laminated core divisions is prepared by bending into an arc shape a rectangular parallelepiped laminated body formed by laminating thin magnetic plates. Second outer plate-joining weld portions are applied at positions dividing the outer surface of the laminated body into three sections, and first inner and outer plate-joining weld portions are applied to the inner surface and the outer surface in the vicinity of end portions of the laminated body.

Abstract: The present invention relates to an insulator element for lining at least one armature slot of an electrical machine. According to the invention, it is provided that the insulator element (10) has at least one plastic element (11), which is intended for lining an armature slot. The present invention also relates to methods for inserting winding elements into the slots of an armature. The present invention further relates to apparatuses for performing the methods of the invention.

Abstract: A rotor and a method of constructing a rotor are disclosed. The rotor includes a hub that is capable of being supported by a shaft that extends along an axis, a plurality of laminations, and a plurality of wire windings supported by the plurality of laminations. The hub includes an inner structure configured to support the hub relative to the shaft, an outer structure that supports the laminations, and an intermediate structure that is coupled to the inner and outer structures and supports the inner and outer structures relative to one another.

Abstract: To ensure mounting between a stator body and a motor or the like by causing a connector portion integrally formed to an insulating member to be positioned away from the stator body through an inclined surface and a gap. In a stator structure for a rotation detector according to the present invention, the inclined surface is formed on the connector portion placed at a part of one of a pair of insulating members of the stator body, and this inclined surface and the gap cause the connector portion to be located away from the stator body, whereby the stator body can be certainly mounted in a motor or the like.

Abstract: An armature of the invention has a component, to be mounted on the shaft, that has a protrusion in the internal diameter; the protrusion engages a knurled feature on the shaft, and the initial stresses can lessen at least in part over the course of time.

Abstract: A vehicle alternator has an armature coil, a rectifier, and a terminal connector. The armature coil has a substantial rectangular cross-section. The rectifier rectifies a voltage induced at the armature coil. The terminal connector includes a crimping portion and a connecting portion. The crimping portion is crimped onto a lead of the armature coil. The connecting portion is fixed to an input terminal of the rectifier with a screw. The crimping portion of the terminal connector is crimped onto the lead so that two opposed surfaces of the lead have surface contact with the terminal connector.

Abstract: An easy-to-start structure for a D.C. brushless motor comprises a base including a through-hole. Plural windings and an IC control member are mounted to the base. At least one magnetically attractive positioning member is mounted to the base and located between two windings that are adjacent to each other. A rotor comprises a shaft rotatably held by a support section in the through-hole and a permanent ring magnet mounted to the shaft, the permanent ring magnet having north and south poles, each of the south pole and the north pole having a strong magnetic area. The positioning member attracts and thus retains one of the strong magnetic areas of the permanent ring magnet in a position proximal to the positioning member when the rotor stops. Thus, the rotor rests in a pre-determined position not located in a dead corner for restarting.

Abstract: An electric machine, includes a stator with a laminated stator body having winding end portions potted in a cast, and a rotor for interaction with the stator. In order to cope with the increased heat development in the zone of the winding end portions compared to the zone of the stator body, the cast of the winding end portions is formed with surface-enlarging structures in heat-conducting contact with a cooling jacket or with a cooling medium, and/or the cast is provided at least partially with a heat-conducting envelope which carries off heat.

Abstract: A heat sink device for retaining a heat dissipating object includes a substrate having an aperture configured therethrough to receive the object and an extruded portion extending from a surface of the substrate defining the aperture. The extruded portion is configured to receive the object and increase a surface area available for heat transfer from said object in said aperture relative to without said extruded portion.

Abstract: A new improved system and method for end turn retention for wires on a generator rotor for use in high speed applications such as in aircraft applications. The rotor includes a shaft, spokes, supports, and wire winding coils, and at least one cap device. The spokes extend radially outwardly from the shaft, and each support is positioned on an associated spoke. Each coil wraps around an associated support and spoke. Each cap device is coupled to an end of its associated spoke to prevent the windings from moving radially outwardly while the rotor spins. Each support is coupled to an associated cap device, and includes at its radially inward edge a flange protruding away from the respective spoke. Because of the flange and the cap device, slack of the wire coil between the flange and the associated cap is taken up.

Abstract: A rotary electric motor has a stator with a plurality of axially spaced sets of corresponding stator and rotor elements. The stator of each set is an annular ring with poles circumferentially positioned about an axis of rotation. The rotor of each set has a plurality of permanent magnets disposed circumferentially along an annular air gap opposite the stator poles. The permanent magnets of adjacent rotor element sets and/or the poles of adjacent stator sets are offset from each other in the axial direction to cancel the effects of cogging torque produce by each of the sets.

Abstract: An electric motor comprising a rotor secured to a shaft, a stator comprising a cylindrical shell receiving at one at least of the ends a flange provided with a roller bearing for the rotor shaft, the flange being fixed to the cylindrical shell by a fixing means having a bayonet-type assembly, wherein the assembling of the flange onto the shell being achieved through a relative displacement in an axial translation and a rotary relative motion.

Abstract: The present invention has a stator 3 around which an armature coil 11 is wound, a rotor 5 rotatably arranged inside or outside the stator 3, ring magnets 24 and a sensor unit 25 for detecting positions of the rotor, a motor driver 31 for controlling current flowing into the armature coil 11 such that a rotating magnetic field is formed in accordance with rotating positions of the rotator. The rotator 5 has a field magnet on including a plurality of permanent magnets 9 magnetized at the same pole, and a plurality of control poles 10 made of a magnetic material and arranged between the permanent magnets 9. Further, a field coil 13 forming a closed magnetic path passing through the control poles 10 is provided in a side of the stator 3. By controlling directions and amounts of current flowing into the field coil 13, motor characteristics are controlled without reducing motor efficiency thereof.

Abstract: A connection between a tubular housing 10 and an end cap 20 of a miniature electric motor is made tight by using a circumferentially extending finger 16 on the housing which is bent radially to engage a lip 32 in a recess 30 in the end cap 20 whereby radial deformation of the finger 16 causes an axial clamping of the end cap 20 to the housing 10 without any separation caused by spring back of the finger 16 following deformation.

Abstract: An alternator includes a rear-end fan which is constructed so as to have greater capacity than a front-end fan. The construction is such that a flow rate in a front-end ventilation pathway in which a cooling air flow enters through front-end air intake apertures is deflected centrifugally by the front-end fan and is then expelled through front-end air discharge apertures is greater than a flow rate in a rear-end ventilation pathway in which a cooling air flow enters through rear-end air intake apertures is deflected centrifugally by the rear-end fan and is then expelled through rear-end air discharge apertures.

Abstract: A single cone fluid dynamic bearing motor, including a shaft having a diminishing conical taper surface, a sleeve having a concavity opposite the shaft, lubricant filled in a clearance between the shaft and the sleeve, and magnetic members to generate magnetic attraction between the shaft and the sleeve. Grooves are formed on the conical taper surface of the shaft or the sleeve so as to create load capacity when the motor rotates, whereby rotating parts of the motor are supported by the axial components of the load capacity balanced with the magnetic attraction. The motor thereby achieves reduction in thickness, current, and cost, and inhibits non-repeatable runout.

Abstract: When molding reinforced fiber layers of a creepage block which is in contact with a field winding in a rotor of a rotary electric machine, a layer containing organic fibers made from polybenzoimidazole, polyparaphenylenebenzobisoxazole, aromatic polyamide, polyarylate, and aromatic polyester is integrally molded on that side of the creepage block which is for contact with a field winding. The rotor thus formed stabilizes a slippage between the field winding and the creepage block caused by thermal expansion of the field winding in the rotor during the operation and thereby minimizes the amount of bending of a rotor shaft.