In a method for manufacturing a motor core, when a crimping part for crimping and fastening electromagnetic steel plates is formed, the crimping part includes a crimping straight part, crimping tapered parts disposed on both sides of the crimping straight part, and crimping shoulder parts, the crimping shoulder parts being stepped parts formed between a planar part of other areas of the crimping part and end parts of the crimping tapered parts. When a plate thickness of the planar part is represented by T; a height of the crimping shoulder parts is represented by A; and a height of the crimping straight part is represented by B, below-shown Expressions 1 to 3 are satisfied.

[00001]$\begin{array}{cc}B-AT& \left(\mathrm{Expression}1\right)\end{array}$$\begin{array}{cc}0.9TB1.2T& \left(\mathrm{Expression}2\right)\end{array}$$\begin{array}{cc}0<A0.2T& \left(\mathrm{Expression}3\right)\end{array}$

The present disclosure provides a potting method of a coreless motor, a potting tooling thereof, and a coreless motor. Wherein the potting method includes the steps of providing a stator assembly and a housing, wherein the housing is sleeved on an outer wall of the stator assembly; providing a potting tooling, wherein the potting tooling includes a first potting fixture and a second potting fixture; inserting the first potting fixture into one end of the housing in an axial direction and inserting the second potting fixture into the other end of the housing in an axial direction to form a potting space; injecting glue into the potting space to form an encapsulation layer to encapsulate the stator assembly on the inner wall of the housing. With the potting method of the present disclosure, so as to improve the stability of the stator assembly in the potting process.

A cooling ring for a winding head of an active part of an electric drive machine of a motor vehicle, includes a cavity cooling volume, which surrounds the winding head, and an enveloping plastic component which forms a winding head cooling channel that seals the cooling volume against the winding head and against an environment of the winding head. Also disclose are an active part cooling arrangement and a method for producing a cooling ring.

According to one disclosed method, a magnet segment may be slid linearly along a first surface and onto a second surface of a back iron of a rotor, wherein the first surface is disposed at or above a rim that extends upwardly from the second surface at an outer edge of the back iron to enable the magnet segment to slide over the rim before the magnet segment is slid onto the second surface. According to another disclosed method, a first end of a magnet segment may be pressed against an elastic member located at an inner portion of a back iron for a rotor so that force exerted by the elastic member pushes a second end of the magnet segment against a rim located at an outer portion of the back iron.

A method of manufacturing a stator includes a pressing step of punching an iron core piece forming part from a steel sheet by press molding, a mounting step of mounting insulating paper on each of a plurality of protruding portions arranged in a circumferential direction on an outer peripheral surface of a columnar roll member rotating about a central axis and extending along the central axis, and a stacking step of spirally winding the iron core piece forming part around the outer peripheral surface of the roll member while deforming it in one direction in a width direction by rotating the roll member in a state where the protruding portion and the insulating paper are inserted into a slot, and stacking the iron core piece forming part in a thickness direction.

A method of manufacturing a rotating electric machine core, in which the method includes: a localized alloying processing step of forming a localized alloying area by applying localized alloying processing to the leakage magnetic flux reduction area, where an insulating film is applied onto a surface of an individual sheet or a predetermined number of laminated sheets; a pressing and punching step including a pressing step of pressing the localized alloying area so as to be thinner than other portions of the laminating steel sheet, and a punching step of punching the laminating steel sheet into a shape of the rotating electric machine core; and a laminating and forming step of laminating portions that have been thinned, so as to be to aligned to form gaps therebetween, and forming the rotating electric machine core by laminating the other portions in contact with each other through the insulating film.

The disclosure relates to a stator assembly for an electric machine. Example embodiments disclosed include a rotor assembly for an electric machine, the rotor assembly comprising: a rotor core; a plurality of magnets arranged around the rotor core; and a cylindrical rotor sleeve surrounding the plurality of magnets, wherein the rotor sleeve comprises a laminated composite material having an array of ferromagnetic pins extending through a thickness of the rotor sleeve.

A hairpin preliminary alignment jig includes: an inner ring; an outer ring spaced apart radially outward from the inner ring; a plurality of radial members that is arranged radially between the inner ring and the outer ring and defines a plurality of gaps; an inner alignment mechanism disposed on the inner ring. The inner alignment mechanism includes a plurality of inner alignment members configured to align innermost layer hairpins among a plurality of hairpins received in the plurality of gaps. The hairpin preliminary alignment jig further includes an outer alignment mechanism disposed on the outer ring, and the outer alignment mechanism includes a plurality of outer alignment members configured to align outermost layer hairpins among the plurality of hairpins received in the plurality of gaps.

A method of manufacturing a rotor for an electric motor comprises: positioning a permanent magnet within a magnet hole formed in a rotor body, the rotor body and the permanent magnet to form a rotor for an electric motor; providing an electrically insulating layer between the permanent magnet and a surface of the rotor body, the surface at least partially defines the magnet hole; performing an electrical continuity test on the permanent magnet and the rotor body while the permanent magnet is within the magnet hole and the electrically insulating layer is between the permanent magnet and the surface of the rotor body; determining whether the electrically insulating layer provides at least a threshold electric insulation to prevent of eddy currents circulating; and based on the electrically insulating layer providing at least the threshold electric insulation, approving the rotor for the electric motor.

An apparatus for supporting a rotor during a balancing process, said rotor including a rotor body and first and second rotor shaft members positioned at either side of the rotor body, the apparatus including: one or more support devices for supporting the rotor and/or one or both shaft members thereof; a first holding device including a first abutment member for engaging, in use, with a first axial end face of the rotor body, a second holding device including a second abutment member for engaging, in use, with a second axial end face of the rotor body, wherein the first and second abutment members each include an abutment surface which in use engages the respective axial end face of the rotor body, and wherein an angle of the abutment surface relative to the rotor axis is moveable.