Abstract: A fastening structure for securing a stator of a motor includes a sleeve with a cut portion formed thereon and a fastener. The fastener is composed of a position section and an engaging section, wherein the engaging section engages with the cut portion and the position section presses on the top surfaces of the coil bobbin of the stator.

Abstract: A motor includes a case which has a containing portion in which a rotor is contained, a bracket which closes an opening of the containing portion, the bracket having a through hole, and a conductive elastic member which is provided in the through hole. The conductive elastic member urges a conductive wire against an inner face of the through hole so as to fix the conductive wire.

Abstract: A dynamoelectric device cooling air flow baffle is given a shape that increases its heat transfer and cooling efficiency by providing the baffle with an annular concave surface around its outer perimeter edge that redirects air flow radially inwardly around stator winding end turns while reducing separation of the air flow and also directs the cooling air flow around an inner edge of a center hole of the baffle while reducing separation of the air flow and increasing air flow velocity, thereby efficiently cooling the stator assembly of the dynamoelectric device.

Abstract: An electric rotating machine and a fan motor for vehicle are obtained, wherein variation width of current waveform resulting from occurrence of coils in a short circuit state is narrowed to reduce vibration and noise. A commutator 26 of the fan motor for vehicle comprises twelve segments 24, and a pair of positive/negative brushes are press-contacted to the commutator 26. Among the segments 24, at least one of pairs of segments that the brushes simultaneously contact have mutually different pitches. Therefore, timing when the coil in the short circuit state occurs at an armature and timing when the coil is released from the short circuit state of one brush deviate from those of the other brush temporally. Accordingly, the variation width of current waveform of electric current supplied to the coil connected to the pair of segments 24 narrows at least.

Abstract: Disclosed is a terminal connection structure of a resolver stator coil in which a part of the end portion of the stator coil is left as a free end portion which is free with respect to the terminals, whereby external impact is absorbed, and rupture of the stator coil is prevented, thereby achieving an improvement in reliability. An end portion (3) of a stator coil (1) is wound around terminals (4) to form a winding connection portion (5), and a part of the end portion (3) is left as a free end portion (30) which is not integrally connected to the terminals (4) by soldering or fusing, whereby a spring function is obtained.

Abstract: An axially sliding contact type of a commutator which is capable of removing the problem related to a braking loose caused by magnetic force to prevent increase of consumed electricity, has a rotor including the commutator, and an electric motor having the rotor, in which a gap is axially formed. The commutator is of an axially contact type and comprises a plurality of metal plates made of copper and a noble metal layer coated on the metal plates in a state of disposing a separate layer between the metal plates and the noble metal layer. The separate layer is formed of Nickel plating having a non-magnetic property in a non-electrolysis manner.

Abstract: An end cap 16 for a miniature electric pmdc motor has two fixed brush cages 36, 38 moulded integrally with the end cap and two separate brush cages 40, 42 which are attached to the end cap 16 during the assembly process. The angular separation of the fixed brush cages 36, 38 and the separate brush cages 40, 42 is determined during assembly so that the angle can be adjusted to suit the application of the motor.

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 brush assembly (10) for a miniature electric motor has a beryllium copper strip brush arm (14) and a graphite material brush head (12) moulded to an end thereof The brush arm (14) has a number of apertures. The brush head (12) has a number of projections which pass through the apertures and form one or more caps (24) on the reverse side of the brush arm to secure the brush head (12) to the brush arm (14). A method of forming the brush assembly is also provided.

Abstract: A rotor is disclosed for a synchronous machine comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor, said coil winding having a side section adjacent a side of the rotor core; at least one tension rod extending through a conduit in said rotor core; and a housing attached to the tension rod and connected to the side section of the coil winding, wherein the housing comprises a pair of side panels.

Abstract: A skeleton type brushless motor comprises: a rotor in which a rotational shaft is pressed and fixed; a stator including a first stator core and a second stator core in which rotor receiving parts for receiving the rotor are formed, a coil winding unit coupled to the stator cores, and a coil wound on the coil winding unit; and the first and second stator cores are separated and faces each other centering around the rotational shaft of the rotor, whereby a leakage flux is reduced and maneuverability and efficiency are increased.

Abstract: A cooling system for an electrical machine includes at least one set of heat-conducting inserts positioned so as to transmit heat from at least one part of the winding in the stator to a heatsink. The heatsink may be the frame of the machine itself, but could also be a coolant pipe mounted at one or both ends of the stator. One form of insert is arranged between windings to draw heat away from the sides of the poles. Another form of insert is arranged on the ends of the poles to draw heat from that region.

Abstract: A rotary-linear actuator system, method of manufacturing and method of using a linear actuator are provided. An aspect of the invention includes a rotary-linear actuator having a spindle assembly and a housing assembly. The spindle assembly includes a plurality of annular magnets and a plurality of bar magnets affixed to a rotor. The plurality of annular magnets can be arranged with alternating polarity. The plurality of bar magnets can likewise be arranged with alternating polarity. The housing assembly includes a first set of coil(s) and a second set of coil(s). The spindle assembly can be movable and/or rotatable along a longitudinal axis extending through the spindle assembly. The first set of coil(s) can be arranged to, when energized, interact with at least one of the plurality of annular magnets to move the spindle assembly in a linear mode.

Abstract: A stator for an electric drive, includes a stator housing configured in the form of a stack of laminations and having a stator bore. The housing is surrounded by a cooling jacket and has opposite winding end portions. Tubular insulators abut the bore-confronting inner surface of the winding end portions, whereby the tubular insulators bound respective cavities in concert with end faces of the stator housing and the cooling jacket for receiving the winding end portions, with the cavities being filled with insulating casting material.

Abstract: The electric motor comprises an internal rotor and an external stator with stator windings. The rotor comprises several permanently magnetic pole shoes. The stator windings are supported by stator pole shanks comprising, radially inside, stator pole shoes facing the rotor pole shoes. Via a short circuit bridge, the stator pole shoes are connected with the adjacent stator pole shoes so that all the stator pole shanks are integrally formed with each other. Radially outside, the stator pole shanks and stator pole shoes are connected with each other only by a separate yoke ring set thereon. All the windings are wound from radially outside with one single continuous winding wire when the yoke ring has been removed.

Abstract: The counterplate and/or sleeve are modified to reduce or eliminate distortion in the counterplate in a laser welded fluid bearing design. It is known to directly weld the counterplate which lies across the end of the shaft and the thrust plate to a wall or shoulder of the sleeve in which the counterplate is fit. The radial stiffness of the sleeve is weakened by cutting grooves or the like at or near the interface between the sleeve wall and the counterplate, or on the outer diameter of the sleeve wall to essentially weaken the sleeve wall. This weakening of the sleeve wall prevents bowing or distortion of the counterplate being imposed by the sleeve.

Abstract: A stepping motor includes a first motor unit having a first stator unit and a first rotor unit and a second motor unit having a second stator unit and a second rotor unit. The first stator unit has air-core coils that are radially arranged on a first isolating magnetic disc. The first rotor unit has permanent magnets that are alternatively magnetized in N-pole and S-pole and radially arranged on a second magnetic disc with a predetermined air gap to the first stator unit. Similarly, the second stator unit has air-core coils on a third isolating magnetic disc and the second rotor unit has permanent magnets on a fourth magnetic disc. The first and second stator units are fixed to the different sides of a non-magnetic disc. The first and second rotor units are fixed to a rotation axis and face each other across the first and second stator units.

Abstract: A motor assembly having improved flux density includes a field assembly and an armature assembly rotatably received by the field assembly. The field assembly includes a plurality of like laminations stacked upon each other wherein each field lamination comprises a pair of substantially parallel bracket sides, and a pair of substantially parallel yoke sides which are substantially perpendicular to the pair of bracket sides. Corner pieces connect the yoke sides to the bracket sides wherein the corner pieces are angularly directed between about 40° to about 50° with respect to the yoke sides and the bracket sides. A yoke extends inwardly from each yoke side to form an armature opening therebetween for rotatably receiving the armature assembly.

Abstract: A fastening structure for securing a stator of a motor includes a copper sleeve with a notch thereon and a fastener. The fastener is composed of a position section and a hook section, wherein the hook section engages with the notch and the position section presses on the top surfaces of the coil bobbin of the stator.

Abstract: A pole piece assembly (28) for an electric motor (20) formed of stacked interlocked lamina (46) that define a first set of stacked lamina (50) and a second set of stacked lamina (52). Each of the lamina (46) of the first (50) and second (52) sets of stacked lamina include a hole (60) with the holes (60) being aligned with each other to define an internal cavity. A post (64) is disposed within the cavity with the post (64) having an outer surface (66) and a pair of bores (68) disposed therein. The pole piece assembly (28) is characterized by each of the lamina (46) of the second set of stacked lamina (52) further including a notch (74, 78) with the notch (74, 78) mating with the hole (60). The notches (74, 78) of the second set of stacked lamina (52) are aligned with each other to define a passageway into the internal cavity with the bore (68) of the post (64) being aligned with the passageway to expose the bore (68).