A wave winding for a stator of an electric machine is configured to be placed in a series of stator grooves located along a periphery of the machine to increase power and efficiency of the machine by avoiding losses, particularly during upper rotational speed range operation. The wave winding has at least two conductors for one respective phase of the machine. The conductors are interconnected in parallel and/or series and can be disposed at a given winding pitch in a number of at least two successive stator grooves of each magnetic pole and each phase of the machine in a sequence predefined for each phase and for one respective magnetic pole along the periphery of the machine. The predefined sequence at least of the conductors interconnected in parallel is transposed by at least one groove skip in at least one position along the periphery of the machine.

A wave winding for a stator of an electric machine is configured to be placed in a series of stator grooves located along a periphery of the machine to increase power and efficiency of the machine by avoiding losses, particularly during upper rotational speed range operation. The wave winding has at least two conductors for one respective phase of the machine. The conductors are interconnected in parallel and/or series and can be disposed at a given winding pitch in a number of at least two successive stator grooves of each magnetic pole and each phase of the machine in a sequence predefined for each phase and for one respective magnetic pole along the periphery of the machine. The predefined sequence at least of the conductors interconnected in parallel is transposed by at least one groove skip in at least one position along the periphery of the machine.

A stator manufacturing method in which a coil including a plurality of coil units formed by winding a rectangular wire is fitted in a cylindrical core having a plurality of slots extending in a radial direction and opening in a core inner peripheral surface so that the slots are distributed in a circumferential direction, the rectangular wire being a linear conductor having a rectangular section.

A stator manufacturing method in which a coil including a plurality of coil units formed by winding a rectangular wire is fitted in a cylindrical core having a plurality of slots extending in a radial direction and opening in a core inner peripheral surface so that the slots are distributed in a circumferential direction, the rectangular wire being a linear conductor having a rectangular section.

A rotary electric machine stator core according to the present invention includes: a laminated core in which a plurality of teeth are arranged circumferentially so as to each protrude radially inward from an inner circumferential surface of an annular back yoke; and a plurality of rib members that each have a bolt passage portion, that are joined to an outer circumferential surface of the laminated core such that a bolt insertion direction of the bolt passage portion is oriented in an axial direction, and that are disposed so as to be spaced apart from each other in a circumferential direction.

A multiple parallel conductor that is easy to produce and use and has a plurality of twisted, insulated individual conductors. The individual conductors are arranged above one another in a plurality of sub-conductor bundles arranged next to one another. A strip is applied to the multiple parallel conductor on a side surface of the multiple parallel conductor in the longitudinal direction of the multiple parallel conductor, on which strip spacer plates are arranged so as to be distributed in the longitudinal direction, and the multiple parallel conductor together with the strip and the spacer plates is wrapped with a wrapping.

A strand of a unit coil of an armature coil is transposed by transposition angle 540 degrees in a slot and transposed by a first transposition angle at coil end portions. In the slot, the strand has a change portion in which the change rate of transposition of the strand is changed. An axial-direction middle point of the change portion is located between a position at transposition angle 90 degrees and a position obtained by adding the first transposition angle of the strand to transposition angle 90 degrees.

A strand of a unit coil of an armature coil is transposed by transposition angle 540 degrees in a slot and transposed by a first transposition angle at coil end portions. In the slot, the strand has a change portion in which the change rate of transposition of the strand is changed. An axial-direction middle point of the change portion is located between a position at transposition angle 90 degrees and a position obtained by adding the first transposition angle of the strand to transposition angle 90 degrees.

A rotating electrical machine is equipped with a stator including a stator winding and a stator core with slots. The stator winding includes phase coils each of which is wound in the slots and connected at an end to a phase terminal and at the other end to a neutral point. The phase coils are each made up of unit coils connected in series between a corresponding one of the phase terminals and the neutral point and connected together using connecting conductors. Each of the phase coils includes two or more reversing connecting conductors each of which orients a direction in which the connecting conductor extends from the (i+1).sup.th unit coil to the (i+2).sup.th unit coil to be opposite to that in which the connecting conductor extends from the i.sup.th unit coil to the (i+1).sup.th unit coil. This coil layout ensures a desired degree of electrical insulation in the stator.

A winding arrangement provided on a stator of an electric machine. The winding arrangement includes at least four windings. A first winding and a second winding occupied a first subset of slots; and a third winding and a fourth winding occupied a second subset of the slots. The first subset and the second subset of the plurality of slots are adjoined to each other. A span between two adjacent slots concerning the first winding, the second winding, the third winding, and the fourth winding is chosen from a full-pitch, a short-pitch, and a long-pitch to result in the winding arrangement where the first subsets in a first half of the slots is diagonal to the second subset in a second half of the slots, and the second subset in the first half of the slots is diagonal to the first subset in the second half of the slots.