A coil conductor of each of a U-phase, a V-phase, and a W-phase is provided with a configuration in which a terminal wiring conductor, a first tooth conductor wound around a first tooth, a bridging line conductor, a second tooth conductor wound around a second tooth, and a neutral-point connection conductor are connected in this order. The terminal wiring conductor is connected to the first tooth conductor at an upper side of an insulator. The bridging line conductor is disposed on an upper side of the insulator disposed on a stator core and along an outer side portion of a tooth of another phase. The neutral-point connection conductor is connected to the second tooth conductor at a lower side of the insulator.

A rotating electric machine having high efficiency and high reliability without causing an increase in size and cost is realized. Each of the rectangular wire segment coils has a first region portion and a second region portion connected to the first region portion and formed in the circumferential direction. Adjacent pairs of wire coils include a conductive portion to which the first region portion of one of the rectangular wire segment coils and the second region portion of the other of the rectangular wire segment coils are connected. Each of the plurality of layers includes a first layer in which the first region portion appears at an axial end portion and a second layer in which the second region portion appears at an axial end portion when the coil end is viewed in an axial direction of the rotating electric machine.

A method includes obtaining pre-weld image data of the electric motor stator from one or more image sensors; performing a welding process in response to obtaining the pre-weld image data, obtaining post-weld image data of the electric motor stator from the one or more image sensors in response to performing the welding process, obtaining epoxy image data of the electric motor stator from the one or more image sensors in response to obtaining the post-weld image data, performing a difference-based image processing routine based on the post-weld image data and the epoxy image data to generate a digital twin of the electric motor stator, and determining one or more epoxy characteristics of the electric motor stator based on the digital twin.

A method includes obtaining pre-weld image data of the electric motor stator from one or more image sensors; performing a welding process in response to obtaining the pre-weld image data, obtaining post-weld image data of the electric motor stator from the one or more image sensors in response to performing the welding process, obtaining epoxy image data of the electric motor stator from the one or more image sensors in response to obtaining the post-weld image data, performing a difference-based image processing routine based on the post-weld image data and the epoxy image data to generate a digital twin of the electric motor stator, and determining one or more epoxy characteristics of the electric motor stator based on the digital twin.

A stator has a stator coil provided on an annular stator core. The stator coil is formed of electrical conductor wires each including an electrical conductor and an insulating coat. Each of the electrical conductor wires has a pair of exposed portions where the electrical conductor is exposed from the insulating coat and a covered portion where the electrical conductor is covered with the insulating coat. The pair of exposed portions are formed respectively at opposite end portions of the electrical conductor wire. The covered portion is formed at other portions of the electrical conductor wire than the end portions. At a coil end part of the stator coil, each corresponding pair of the exposed portions of the electrical conductor wires are welded together and each of the covered portions of the electrical conductor wires includes a coat-removed portion where the insulating coat is locally removed from the covered portion.

A stator has a stator coil provided on an annular stator core. The stator coil is formed of electrical conductor wires each including an electrical conductor and an insulating coat. Each of the electrical conductor wires has a pair of exposed portions where the electrical conductor is exposed from the insulating coat and a covered portion where the electrical conductor is covered with the insulating coat. The pair of exposed portions are formed respectively at opposite end portions of the electrical conductor wire. The covered portion is formed at other portions of the electrical conductor wire than the end portions. At a coil end part of the stator coil, each corresponding pair of the exposed portions of the electrical conductor wires are welded together and each of the covered portions of the electrical conductor wires includes a coat-removed portion where the insulating coat is locally removed from the covered portion.

Connection unit for a stator with a stator winding having a number N of phases, having first to Nth contact portions, which are each designed for electrically conductively contacting one of N connection portions of the stator, form a receiving chamber for receiving one of the connection portions and have a guide. A respective contact portion has a wall, which limits the receiving chamber on one side, and the guide of the contact portion has a wall, which adjoins the wall of the contact portion and is bevelled with respect to the wall of the contact portion in a manner facing away from the receiving chamber. A conductor arrangement, which either electrically conductively connects the first to Nth contact portions or comprises N conductor portions, which are electrically isolated from one another and are each electrically conductively connected to one of the contact portions.

Connection unit for a stator with a stator winding having a number N of phases, having first to Nth contact portions, which are each designed for electrically conductively contacting one of N connection portions of the stator, form a receiving chamber for receiving one of the connection portions and have a guide. A respective contact portion has a wall, which limits the receiving chamber on one side, and the guide of the contact portion has a wall, which adjoins the wall of the contact portion and is bevelled with respect to the wall of the contact portion in a manner facing away from the receiving chamber. A conductor arrangement, which either electrically conductively connects the first to Nth contact portions or comprises N conductor portions, which are electrically isolated from one another and are each electrically conductively connected to one of the contact portions.

It is intended to prevent a space for forming coils from being reduced in dimension. A first coil includes a first wound wire portion and a second wound wire portion. The second wound wire portion is disposed on or radially outside the first wound wire portion. A second coil includes a third wound wire portion and a fourth wound wire portion. The fourth wound wire portion is disposed on or radially outside the third wound wire portion. A connecting portion includes a first link wire and a second link wire. The first link wire connects the first and third wound wire portions therethrough to each other. The second link wire connects the second and fourth wound wire portions therethrough to each other. The second link wire is disposed radially outside the first link wire.

It is intended to prevent a space for forming coils from being reduced in dimension. A first coil includes a first wound wire portion and a second wound wire portion. The second wound wire portion is disposed on or radially outside the first wound wire portion. A second coil includes a third wound wire portion and a fourth wound wire portion. The fourth wound wire portion is disposed on or radially outside the third wound wire portion. A connecting portion includes a first link wire and a second link wire. The first link wire connects the first and third wound wire portions therethrough to each other. The second link wire connects the second and fourth wound wire portions therethrough to each other. The second link wire is disposed radially outside the first link wire.