A stator core comprises a stack and a resin portion. The stack comprises an annular yoke portion, a plurality of tooth portions, and a plurality of slots. The resin portion covers an inner wall surface of a slot of the plurality of slots. The resin portion protrudes outward relative to an end surface of the stack in a height direction of the stack. The resin portion is formed on at least a part of an end surface of the tooth portion so as to extend from the inner wall surface of the slot around the end surface of the tooth portion. A resin end portion of the resin portion is disposed on the end surface of the stack and a corner of the resin end portion is formed as an inclined surface including a planar surface or curved surface.

An exemplary apparatus for impregnating varnish into stator coils of a hairpin winding type stator includes a supporting frame vertically installed on a base frame, a tilting bracket installed upper end portion of the supporting frame to be capable of tilting, a rotary bracket installed on the tilting bracket to be rotatable along a circumferential direction, core chucking members installed on the rotary bracket, inserted into a plurality of bolt engagement hole provided in the stator core, and fixing the stator core to the rotary bracket, a first varnish application unit movably installed on the base frame, and configured to apply the varnish to interior and exterior sides of a crown portion of the stator coils, and a second varnish application unit movably installed on the base frame, and configured to apply the varnish to interior and exterior sides of the welding portion of the stator coils.

A tooth-wound coil of a stator or of a stator segment of a dynamo-electric machine having two straight sections spaced apart from each other and running substantially parallel. Two 180° curves are located on the ends thereof, wherein the straight sections have an active part area, the axial extend of which is less than or equal to that of the straight section. The tooth-wound coil has a symmetrical extension plane running in the longitudinal direction. An insulation material is provided around the straight sections of the tooth-wound coil. The material effects groove isolation and/or phase isolation in the stator or stator segment.

The invention relates to a method for producing a stator, comprising the steps of: providing a stator, which comprises one or more windings and a winding head, the winding head comprising one or more cable ends; positioning a phase connection assembly by means of a retaining element on the winding head, the phase connection assembly comprising at least one cable element; connecting the at least one cable element to a corresponding cable end of the winding head; removing the retaining element.

A method for producing a wire coil. Multiple windings of a ply of the wire coil including an insulated wire are wound onto a coil core of the wire core starting from a first winding up to a last winding. The last winding is hooked in an electrically insulating deflection hook of the wire coil which is fixed with respect to the coil core and the wire is deflected by the deflection hook.

The alignment method of the electrical conductors includes an aligning step of aligning a plurality of electrical conductors 40 in an annular shape while being overlapped in a circumferential direction of the annular shape by moving gripping devices 230 inward in a radial direction of the annular shape, in which the gripping device 230 has a pair of claws 232g1 and 232g2 capable of pinching one leg portions 41 of the substantially U-shaped electrical conductors 40 one by one, one claw 232g1 has a length capable of gripping one leg portion 41, and the other claw 232g2 has a length capable of gripping one leg portion 41 of one substantially U-shaped electrical conductor 40-1 and gripping the other leg portion 44 of the other substantially U-shaped electrical conductor 40-2.

A rotor core includes laminate steel plates extending in a radial direction with respect to a central axis. The laminate steel plates each include a base portion on a radially outer side of the central axis, and pieces separately disposed on a radially outer side of the base portion with penetrating portions therebetween, and arranged side by side at predetermined intervals in a circumferential direction. The laminate steel plates are laminated in an axial direction. The laminated steel plate at an upper end in the axial direction includes at least one of an outward projection extending radially outward from an outer edge portion of the base portion and an inward projection extending radially inward from an inner edge portion of the piece, and the laminated steel plate at a lower end in the axial direction includes an intervening portion between the base portion and the piece portion.

Certain aspects relate to systems and methods to join leads of stator windings to components of an electric machine, such as a bus bar of a stator of the electric machine. Systems and methods include modifying a surface of the lead and laser welding the surface-modified lead to the bus bar. Systems and methods can include reducing the reflectivity of the lead by imparting a non-smooth surface on the lead, thereby allowing a laser to deliver concentrated energy onto the lead. The surface-modified lead can include knurled surface, a pattern of raised grooves stamped into the surface of the lead, or a roughened surface.

A stator includes: a stator core in which a coil strand is wound around each of a plurality of teeth portions formed in an annular yoke portion; an annular plate that is disposed at a position overlapping an annular portion of the stator core in a direction along an axial center of the stator core; a plurality of terminals which are supported by the plate and to which end portions of a plurality of the coil strands drawn out from the stator core are respectively connected; and a resin that encloses the stator core and the plate in a state where a part of the plurality of terminals is exposed.

The present disclosure relates to a method to apply an insulation to a retaining ring for end windings of an electric machine and to a fillable bag to apply an insulation to a retaining ring. Disclosed is a method to apply an insulation to a retaining ring for end windings of an electric machine, with the steps of providing a retaining ring housing, attaching an insulation at the inside of the retaining ring housing, and inflating a bag inside the retaining ring housing to apply pressure to the insulation. Also disclosed is a fillable bag to apply a pressure to an electric insulation inside a retaining ring for end windings of an electric machine.