A rotating electric machine includes an armature that has an armature winding of multiple phases. The armature winding is configured by a conductor being wound. The conductor is configured by a plurality of wires covered by an insulation coating in a state in which the plurality of wires are bundled. Each of the plurality of wires includes a conductor body configured to permit flow of a current, and a fusion layer that covers a surface of the conductor body. The fusion layer is configured to be thinner than the insulation coating. In the state in which the plurality of wires are bundled, fusion layers of the plurality of wires are fused and in contact with one another. A coefficient of linear expansion of the fusion layer differs from a coefficient of linear expansion of the insulation coating.

A rotating electric machine includes an armature that has an armature winding of multiple phases. The armature winding is configured by a conductor being wound. The conductor is configured by a plurality of wires covered by an insulation coating in a state in which the plurality of wires are bundled. Each of the plurality of wires includes a conductor body configured to permit flow of a current, and a fusion layer that covers a surface of the conductor body. The fusion layer is configured to be thinner than the insulation coating. In the state in which the plurality of wires are bundled, fusion layers of the plurality of wires are fused and in contact with one another. A coefficient of linear expansion of the fusion layer differs from a coefficient of linear expansion of the insulation coating.

In a rotating electric machine that includes an armature with an armature coil, the armature coil is formed by winding an electrical conductor wire. The electrical conductor wire includes a plurality of element wires in a bundled state and an insulating coat covering the bundled element wires. Each of the element wires includes an electrical conductor through which electric current flows, and a fusing layer that covers a surface of the electrical conductor. In the bundled state of the element wires, the fusing layers of the element wires are in contact with and fused to one another. Between adjacent parts of the electrical conductor wire wound to form the armature coil, there are formed gaps due to differences in straightness between different parts of the electrical conductor wire. The gaps are filled with a filler.

In a rotating electric machine that includes an armature with an armature coil, the armature coil is formed by winding an electrical conductor wire. The electrical conductor wire includes a plurality of element wires in a bundled state and an insulating coat covering the bundled element wires. Each of the element wires includes an electrical conductor through which electric current flows, and a fusing layer that covers a surface of the electrical conductor. In the bundled state of the element wires, the fusing layers of the element wires are in contact with and fused to one another. Between adjacent parts of the electrical conductor wire wound to form the armature coil, there are formed gaps due to differences in straightness between different parts of the electrical conductor wire. The gaps are filled with a filler.

Various implementations include a stator assembly for an axial flux permanent magnet machine. The stator assembly may include a set of stator bars and a set of shoes for the stator bars. A shoe may be provided at one or each end of a stator bar. The stator assembly may further include a set of coils each wound around a respective stator bar. Each shoe has an inner surface adjacent to the end of one of the stator bars. The end of each stator bar has a rim, and each inner surface has a cut-away region over part of the rim to reduce a component of magnetic flux at the end of the stator bar.

Various implementations include a stator assembly for an axial flux permanent magnet machine. The stator assembly may include a set of stator bars and a set of shoes for the stator bars. A shoe may be provided at one or each end of a stator bar. The stator assembly may further include a set of coils each wound around a respective stator bar. Each shoe has an inner surface adjacent to the end of one of the stator bars. The end of each stator bar has a rim, and each inner surface has a cut-away region over part of the rim to reduce a component of magnetic flux at the end of the stator bar.

A stator core includes plate-shaped core members laminated to define the stator core. Each core member includes an annular core back portion, and tooth portions that project radially inward from an inner circumferential surface of the core back portion. The core back portion includes at least one recessed portion recessed radially inward from an outer circumferential surface of the core back portion, and at least one welded portion arranged at a corresponding one of the at least one recessed portion to join axially adjacent ones of the core members. The at least one recessed portion is recessed in a radial direction is in a range of about 0.2 mm to about 1.5 mm, both inclusive.

A stator core includes plate-shaped core members laminated to define the stator core. Each core member includes an annular core back portion, and tooth portions that project radially inward from an inner circumferential surface of the core back portion. The core back portion includes at least one recessed portion recessed radially inward from an outer circumferential surface of the core back portion, and at least one welded portion arranged at a corresponding one of the at least one recessed portion to join axially adjacent ones of the core members. The at least one recessed portion is recessed in a radial direction is in a range of about 0.2 mm to about 1.5 mm, both inclusive.

To reduce a loss of a rotating electric machine by making it difficult for an eddy current to occur in a welding portion of the rotating electric machine. A rotating electric machine includes a rotor including a magnet on an outer circumferential portion, a stator core having plural teeth facing the outer circumferential portion of the rotor via a gap, an electric insulator covering a part of a surface of the stator core, and plural coils wound around the stator core via the electric insulator. The stator core has plural steel plates stacked in an axial direction. At least two plural steel plates [adjacent to each other in the axial direction, of the plural steel plates, are welded at a position on the surface of the stator core, the position being outside a closed magnetic circuit generated in the stator core. The plural steel plates are not welded at a position on the surface of the stator core where each tooth faces the rotor.

To reduce a loss of a rotating electric machine by making it difficult for an eddy current to occur in a welding portion of the rotating electric machine. A rotating electric machine includes a rotor including a magnet on an outer circumferential portion, a stator core having plural teeth facing the outer circumferential portion of the rotor via a gap, an electric insulator covering a part of a surface of the stator core, and plural coils wound around the stator core via the electric insulator. The stator core has plural steel plates stacked in an axial direction. At least two plural steel plates [adjacent to each other in the axial direction, of the plural steel plates, are welded at a position on the surface of the stator core, the position being outside a closed magnetic circuit generated in the stator core. The plural steel plates are not welded at a position on the surface of the stator core where each tooth faces the rotor.