A stator unit of an electric motor for driving a hermetic compressor including a stator core and a coil separator cage, which is inserted into the stator core and includes a substantially annular disc-shaped base part and elongated separating webs distributed over the circumference of the base part, with their longitudinal axes extending in the axial direction relative to the stator core, wherein the annular disc-shaped base part is fastened to a first end face of the stator core, and a separating web engages in each stator slot, such that one of the separating webs is arranged between two adjacent coils, wherein each gap between the coil separator cage and the coil windings is filled with an insulating filler.

An insulation system of a current-carrying conductor of an electric machine. The insulation system comprises a thermally curable resin including a polymer resin matrix and a nanoparticulate filler. A mica paper or mica tape is impregnated with the thermally curable resin. The thermally curable resin comprises nanoparticulate filler, the total quantity of nanoparticulate filler being at least 0.1 wt % and not more than 0.5 wt %.

A winding head arrangement for an electric rotating machine includes a base body including an electrically conductive material having an electrically insulating coating, and a plurality of conductors made from a first metal material and connected to the base body via the electrically insulating coating by a first additive production method.

The object of the invention is to improve operability of the process for inserting the coil conductor into the insulating member stored inside the slot of the rotor core. Each of the first insulating member and the second insulating member has one side arranged between the first coil and the second coil so that the respective sides are superposed along the radial direction of the stator core. The side of the first insulating member and the side of the second insulating member are connected with the first connection part at one end in the longitudinal direction.

A prefabricated coil for placement on a tooth for a direct drive is orthocyclically wound from a wire of circular cross section. The coil includes two straight portions having an inner surface facing an interior of the coil and an outer surface opposite and parallel to the inner surface. A distance between the inner surface and the outer surface defines a thickness of the coil. Two coil overhangs connect the straight portions. A distance between the coil overhangs defines a height of the straight portions. The inner and outer surfaces of the straight portions have the height of the straight portions and a width of the straight portions. A sheet-like insulator covers the straight portions. The wire and the sheet-like insulator are bonded together such that the coil is self-supporting under the application of pressure and temperature. The sheet-like insulator has a joint region at the outer surface.

A stator includes an annular stator core having slots formed therein, a stator coil received in the slots, and insulating sheets each being interposed, in a corresponding one of the slots, between the stator coil and an interior wall surface of the stator core defining the corresponding slot. Each of the insulating sheets includes a sheet-like substrate and a resin layer provided on an outer surface of the substrate. The resin layer is formed of a curable and foamable resin that is foamed and cured by external stimulation. Each of the insulating sheets has an extension portion located outside the corresponding slot and extending nonparallel to an axial direction of the stator core so as to face an axial end face of the stator core. In each of the insulating sheets, the resin layer is provided, on the outer surface of the substrate, in a region including the extension portion.

A bar or coil includes a conductor arranged in a rotating electrical machine and an insulating layer having a predetermined insulation thickness disposed on a surface of the conductor. The repair method includes: extracting a part of the bar or coil as a repair target; removing the insulating layer in a part of the bar or coil as the repair target; disposing a first insulating layer in the part where the insulating layer is removed, the first insulating layer having an insulation thickness thinner than the predetermined insulation thickness; and disposing a second insulating layer on a surface of the first insulating layer to form an insulating layer after a repair where the first insulating layer and the second insulating layer are added, the insulating layer after the repair having a thickness of the predetermined insulation thickness.

A process is described, for making an electric conductor for a winding of an electric machine comprising the following steps: providing an external shell (20} with a tubular shape made of electrically conducting material; inserting at least two wires (215 made of electrically conducting material in the external shell (20); heating the external shell (20) and the wires (21) inserted therein; laminating wherein the external shell (205 and the wires (215 are formed to modify the profile of their cross section; optionally repeating at least one of the two previous steps; an electric conductor made with such process and an electric machine comprising a winding made with such electric conductor are further described.

A method of fabricating a stator and a stator where the method includes providing a plurality of electromagnet cores, with each electromagnet core having a stack of laminations defining a tooth and a yoke segment. The yoke segment is defined by a stack of laminations having a tongue structure and an opposing groove structure. Representative methods also include providing an insulating bobbin surrounding a portion of the tooth of each lamination, such that each lamination is held against adjacent laminations by the bobbin. The method further includes the step of winding electrically conductive windings around a portion of the bobbin, and assembling the plurality of electromagnets into a stator by mating the tongue structure and the groove structure of each electromagnet with a corresponding tongue structure and a corresponding groove structure of adjacent electromagnets. Additional embodiments includes a stator having the above characteristics.

A stator core, a coil, and a receiving member are included. The coil is attached to the stator core and secured by an impregnant and includes a coil end extending from an end face of the stator core in an axial direction outward in the axial direction. The receiving member having an annular shape is fixed to the end face of the stator core so as to be disposed on a farther outer side than the coil end in a radial direction of the stator core. The receiving member has an outer diameter wa smaller than an outer diameter of the stator core and has a height ha along the axial direction smaller than a height of the coil end.