Abstract: First-fourth slots may be provided in an inner circumferential surface of a stator core. A coil may include first-third segments conductor. Each of the conductors may include a U-shape. The first segment conductor may be inserted in the first slot and the second slot in a state where a coupling portion of the first segment conductor is located at a position facing a first end surface. The second segment conductor may be inserted in the second slot and the third slot in a state where a coupling portion of the second segment conductor may be located at a position facing a second end surface. The third segment conductor may be inserted in the third slot and the fourth slot in a state where a coupling portion of the third segment conductor may be located at a position facing the first end surface.

Abstract: A cooling system is provided. Coil ends protrude outward from a first end of a stator core in a direction along a central axis. An imaginary straight line is orthogonal to both of a central axis of a core body and an axis extending in an up-down direction. Half the coil ends above the imaginary straight line are in a first portion. Each of the segment coils in the first portion includes an outer peripheral surface that faces in a direction opposite from the central axis. The outer peripheral surface of each of the segment coils includes a twisted surface. The direction in which the twisted surface faces becomes closer to the direction facing the stator core as the twisted surface extends toward the first end of the stator core.

Abstract: A stator manufacturing method includes an inserting step of inserting lead-side segment coils covered with an insulating film and lead-opposite-side segment coils covered with an insulating film into a plurality of slots formed between a plurality of teeth radially protruding from an annular yoke, along the axial direction of the yoke, and electrically connecting the segment coils by using connecting members, in the inserting step, the plurality of segment coils are collectively inserted into the slots, and the method further includes an exposing step of forming the segment coils with exposed conductor portions by forming holes penetrating the insulating films in crossover parts of the segment coils while the segment coils are inserted in the slots.

Abstract: A method of manufacturing a coil includes a preparation step of preparing a copper wire, a winding step of winding a plurality of aluminum wires around the copper wire, and a pressing step of pressing the copper wire and the plurality of aluminum wires so as to form an aluminum coat around the copper wire and form an anodized aluminum film on the surface of the aluminum coat.

Abstract: A cooling system is provided. Coil ends protrude outward from a first end of a stator core in a direction along a central axis. An imaginary straight line is orthogonal to both of a central axis of a core body and an axis extending in an up-down direction. Half the coil ends above the imaginary straight line are in a first portion. Each of the segment coils in the first portion includes an outer peripheral surface that faces in a direction opposite from the central axis. The outer peripheral surface of each of the segment coils includes a twisted surface. The direction in which the twisted surface faces becomes closer to the direction facing the stator core as the twisted surface extends toward the first end of the stator core.

Abstract: First-fourth slots may be provided in an inner circumferential surface of a stator core. A coil may include first-third segments conductor. Each of the conductors may include a U-shape. The first segment conductor may be inserted in the first slot and the second slot in a state where a coupling portion of the first segment conductor is located at a position facing a first end surface. The second segment conductor may be inserted in the second slot and the third slot in a state where a coupling portion of the second segment conductor may be located at a position facing a second end surface. The third segment conductor may be inserted in the third slot and the fourth slot in a state where a coupling portion of the third segment conductor may be located at a position facing the first end surface.

Abstract: Disclosed are: preparing a rotor core having a plurality of magnet holes spaced near a circumferential edge of the rotor core; preparing a plurality of permanent magnet units each including a porous body and a magnet main body disposed in contact with each other; and inserting the permanent magnet units into the magnet holes and securing the permanent magnet units in the magnet holes.

Abstract: A method of manufacturing a coil includes a preparation step of preparing a copper wire, a winding step of winding a plurality of aluminum wires around the copper wire, and a pressing step of pressing the copper wire and the plurality of aluminum wires so as to form an aluminum coat around the copper wire and form an anodized aluminum film on the surface of the aluminum coat.

Abstract: A stator includes a stator core and a coil. The coil has a first segment coil, a second segment coil having a wire diameter greater than a wire diameter of the first segment coil, and a crossover wire connecting the first segment coil and the second segment coil. The first segment coil is disposed in a slot radially innermost to the stator core. At least one second segment coil is disposed in the slot. The crossover wire has a changeover portion at which a wire diameter of the crossover wire changes from a wire diameter of the first segment coil to a wire diameter of the second segment coil.

Abstract: A rotary electric machine includes a stator core having a plurality of teeth arranged in a row along a circumferential direction of the stator core, and a stator coil composed of a winding wire wound around the teeth. The stator coil includes coil end portions extending, outside the stator core in an axial direction thereof, along a substantially circumferential direction of the stator core, and straight portions extending along the axial direction, the straight portions being at least partially housed in a slot which is a void defined by two adjacent teeth of the plurality of teeth. In the rotary electric machine, a cooling groove is formed at least in the straight portion, the cooling groove functioning as a cooling channel through which a cooling fluid flows, and each straight portion includes only one cooling channel.

Abstract: A rotary electric machine includes a stator core having a plurality of teeth arranged in a row along a circumferential direction of the stator core, and a stator coil composed of a winding wire wound around the teeth. The stator coil includes coil end portions extending, outside the stator core in an axial direction thereof, along a substantially circumferential direction of the stator core, and straight portions extending along the axial direction, the straight portions being at least partially housed in a slot which is a void defined by two adjacent teeth of the plurality of teeth. In the rotary electric machine, a cooling groove is formed at least in the straight portion, the cooling groove functioning as a cooling channel through which a cooling fluid flows, and each straight portion includes only one cooling channel.

Abstract: A stator core of a stator includes a plurality of teeth around a rotation axis and slots respectively provided between the teeth. A coil that is formed by connecting a plurality of coil segments is wound around the teeth. At a coil end protruding from an end surface of the stator core in the rotation axial direction, a widened portion is provided in the coil segment. Therefore, a cross-sectional area of the coil segment at the coil end is different from that on the inner side of the slot.

Abstract: A rotary electric machine includes a stator core having a plurality of teeth arranged in a row along a circumferential direction of the stator core, and a stator coil composed of a winding wire wound around the teeth. The stator coil includes coil end portions extending, outside the stator core in an axial direction thereof, along a substantially circumferential direction of the stator core, and straight portions extending along the axial direction, the straight portions being at least partially housed in a slot which is a void defined by two adjacent teeth of the plurality of teeth. In the rotary electric machine, a cooling groove is formed at least in the straight portion, the cooling groove functioning as a cooling channel through which a cooling fluid flows, and each straight portion includes only one cooling channel.

Abstract: A stator includes a stator core having an annular shape, the stator core being wound with a coil. The stator core includes a plurality of magnetic plates and a porous body intervening between the plurality of magnetic plates, the plurality of magnetic plates and the porous body being layered.

Abstract: Disclosed are: preparing a rotor core having a plurality of magnet holes spaced near a circumferential edge of the rotor core; preparing a plurality of permanent magnet units each including a porous body and a magnet main body disposed in contact with each other; and inserting the permanent magnet units into the magnet holes and securing the permanent magnet units in the magnet holes.

Abstract: A stator of a dynamo-electric machine including: a stator core having a plurality of slots; and a stator coil wherein the stator coil includes: lower conductor segments inserted into the slots, a plurality of coupling members with fitting recesses formed therein such that inside the slots, tips of upper conductor segments are press-fitted into the fitting recesses to couple together the conductor segments, and a plurality of heat dissipation sheets placed between outer circumferential surfaces of the coupling members and inner surfaces of the slots.