An electric motor includes a shaft, and a stator disposed around the outer periphery of the shaft and including a plurality of slots extending toward the shaft. A plurality of coil units are arranged respectively in the plurality of slots. The coil units are each formed of a plurality of wires connected in parallel. One of the coil units that is arranged in at least one of the plurality of slots formed in the stator includes a plurality of winding groups that are connected in series and that have a different number of turns from each other. The winding groups are arranged in the slot in descending order of the number of turns in the direction toward the shaft.

An electric motor includes a shaft, and a stator disposed around the outer periphery of the shaft and including a plurality of slots extending toward the shaft. A plurality of coil units are arranged respectively in the plurality of slots. The coil units are each formed of a plurality of wires connected in parallel. One of the coil units that is arranged in at least one of the plurality of slots formed in the stator includes a plurality of winding groups that are connected in series and that have a different number of turns from each other. The winding groups are arranged in the slot in descending order of the number of turns in the direction toward the shaft.

In order to facilitate the production of coil windings in components of electrical machines a method and a device are provided for winding a wave winding mat for forming a coil winding of an electrical machine, wherein one or more wires are wound with a predefined wire spacing between wire sections, wherein the wire spacing is set differently for different regions of the wave winding mat.

In order to facilitate the production of coil windings in components of electrical machines a method and a device are provided for winding a wave winding mat for forming a coil winding of an electrical machine, wherein one or more wires are wound with a predefined wire spacing between wire sections, wherein the wire spacing is set differently for different regions of the wave winding mat.

A coil attachable to a tooth extending to one radial side of the tooth from an annular core back surrounding a central axis of a motor includes a first winding body including a first wound flat wire, and a second winding body including a second wound flat wire, that is located on a radial side of the first winding body, and that is connected to the first winding body. When N is a freely-selected integer of 1 or more, and M is a freely-selected integer larger than N, the first winding body is an N-layer winding body aligned and wound in two rows aligned in a radial direction, and the second winding body is an M-layer winding body aligned and wound in two rows aligned in the radial direction.

A coil attachable to a tooth extending to one radial side of the tooth from an annular core back surrounding a central axis of a motor includes a first winding body including a first wound flat wire, and a second winding body including a second wound flat wire, that is located on a radial side of the first winding body, and that is connected to the first winding body. When N is a freely-selected integer of 1 or more, and M is a freely-selected integer larger than N, the first winding body is an N-layer winding body aligned and wound in two rows aligned in a radial direction, and the second winding body is an M-layer winding body aligned and wound in two rows aligned in the radial direction.

A stator and a manufacturing method thereof is enabled to easily determine the quality of welding produced between conductors. The stator includes a stator core and a stator winding installed in the stator core. The stator winding is configured by including multiple flat conductor segments in which conductors 34 are coated with insulating films 35, respectively. At a leading end of each of the conductor segment, an exposed portion 33 is formed in which the conductor is exposed. At a coil end section of the stator winding, a pair of exposed portions of different conductor segments are joined together by laser welding. A collective conductor width in a joining direction in which exposed portions join with each other is smaller at a laser irradiation incidence side, which is a side of the exposed portions receiving laser irradiation than that at a side opposite to the laser irradiation incidence side.

Embodiments of the currently claimed disclosure are directed to methods for inserting an undulated coil assembly in the slots of a hollow core of a dynamoelectric machine. In some embodiments, the method can include positioning at least a first coil portion of the coil assembly around a support member, aligning a guide device with respect to end faces and the slots of the core, feeding the first coil portion from the drum support member along the guide device to insert adjacent superimposed linear portions (LI) of the coil assembly in the slots, engaging the superimposed linear portions (LI) along at least one guide surface during the feeding, and relatively moving the core with respect to the guide assembly device to position the slots for receiving the superimposed linear portions (LI).

The present disclosure provides a stator of an electric rotating machine, a hairpin of a stator of an electric rotating machine, and a manufacturing method thereof. The stator for the electric rotating machine comprises a stator core, and a stator coil comprising hairpins. Each hairpin comprises a conductor, a film surrounding the conductor, a pair of insertion parts configured to be inserted into different slots, and a connection part connecting the insertion parts. The connection part comprises first and second bending parts bent with a predetermined radius of curvature such that the pair of insertion parts are insertable into different layers. The hairpins include first and second hairpins, each of the first and second hairpins configured to protrude from one end of the stator core by different protrusion lengths. Each of the first and second hairpins comprises a region configured to cross each other.

An assembly and method of manufacturing the coil assembly is provided. The method includes acquiring a sheet of a conductive metal and producing a plurality of coils from the sheet of conductive metal. Further, the method includes layering at least two of the plurality of coils with an insulation layer there between to construct the coil assembly and electrically coupling the at least two of the plurality of coils within the coil assembly.