An example system includes a dynamo-electric machine. The dynamo-electric machine includes a rotor that is cylindrical and that is configured for rotation and a stator that is arranged relative to the rotor. The stator has a stepped configuration that defines a first diameter for the stator and a second diameter for the stator. The first diameter is greater than the second diameter. Zones of the stator at the first diameter hold direct-axis (D-axis) windings and zones of the stator at the second diameter hold quadrature axis (Q-axis) windings. An airgap between the rotor and the Q-axis windings is greater than an airgap between the rotor and the D-axis windings.

An example system includes a dynamo-electric machine. The dynamo-electric machine includes a rotor that is cylindrical and that is configured for rotation and a stator that is arranged relative to the rotor. The stator has a stepped configuration that defines a first diameter for the stator and a second diameter for the stator. The first diameter is greater than the second diameter. Zones of the stator at the first diameter hold direct-axis (D-axis) windings and zones of the stator at the second diameter hold quadrature axis (Q-axis) windings. An airgap between the rotor and the Q-axis windings is greater than an airgap between the rotor and the D-axis windings.

A circuit board is in the shape of a strip and includes: in one longitudinal end portion thereof, power connection portions connected to an external power supply; in another longitudinal end portion thereof, land portions to which portions of conducting wires drawn out downwardly of a base portion are connected; and pattern portions electrically connected to the power connection portions and the land portions. The land portions include a first land portion, and a second land portion arranged adjacent to the first land portion. The pattern portions include a first pattern portion electrically connected to the first land portion, and a second pattern portion arranged adjacent to the first pattern portion, and electrically connected to the second land portion. The first pattern portion and the second land portion are arranged to overlap with each other when viewed in a widthwise direction of the circuit board. Alternatively or additionally, the first and second land portions are arranged to overlap with each other when viewed in a longitudinal direction of the circuit board.

Rotating electric machine provided with an axis X. The machine comprises a front part and a rear part. The machine comprises a rotor of axis X comprising two axial end surfaces, each provided with fan blades. The axial surfaces located on the side of the front part and on the side of the rear part. A stator comprises a stator body having slots. The stator comprises a winding installed in the slots and forming a front winding head and a rear winding head. The rotor and the stator are placed in a casing. The front winding head completely masks the blades of the axial surface located on the front side of the machine, along a direction perpendicular to axis X.

Rotating electric machine provided with an axis X. The machine comprises a front part and a rear part. The machine comprises a rotor of axis X comprising two axial end surfaces, each provided with fan blades. The axial surfaces located on the side of the front part and on the side of the rear part. A stator comprises a stator body having slots. The stator comprises a winding installed in the slots and forming a front winding head and a rear winding head. The rotor and the stator are placed in a casing. The front winding head completely masks the blades of the axial surface located on the front side of the machine, along a direction perpendicular to axis X.

An assembly can include a rotor that defines a rotor axis and that includes a number of permanent magnets; a stator that defines a stator axis, coaxially aligned with the rotor axis, and that includes a number of electropermanent magnets; and a controller that controls polarity of the electropermanent magnets to rotate the rotor about the rotor axis.

In one embodiment, a generator includes an alternating current exciter to output first, second and third alternating currents respectively having first, second and third phases, and a rotary rectifier to convert the first, second and third alternating currents into first, second and third direct currents, respectively. The generator further includes a rotating shaft on which the exciter and the rectifier are mounted, and plural conductors mounted on the shaft, and including one or more first conductors, one or more second conductors and one or more third conductors to respectively supply the first, second and third alternating currents from the exciter to the rectifier. The plural conductors include one or more conductor groups in each of which two or more conductors are collectively arranged, and each of the conductor groups includes the two or more conductors arranged to cancel a magnetic field around each conductor in the same group.

Provided is a stator of a rotary electric machine excellent in insulation property and productivity, and a rotary electric machine equipped therewith. A stator of a rotary electric machine includes a stator core that is provided with a plurality of slots; and a stator coil that is provided in the slots, wherein N (herein, N is a positive even number) segment conductors are provided in each slot, wherein the stator coil is configured such that the plurality of segment conductors are connected through welding portions, each of which is provided in a conductor end portion of each segment conductor, wherein the conductor end portions are arranged in an annular shape in a circumferential direction in a coil end in an axial direction, and N annular rows are configured, and wherein directions of punching burr portions of a stator slot and the stator core on an inner-diameter side of the stator are inverted to a direction of a punching burr portion of the stator core on an outer-diameter side of the stator.

Provided is a stator of a rotary electric machine excellent in insulation property and productivity, and a rotary electric machine equipped therewith. A stator of a rotary electric machine includes a stator core that is provided with a plurality of slots; and a stator coil that is provided in the slots, wherein N (herein, N is a positive even number) segment conductors are provided in each slot, wherein the stator coil is configured such that the plurality of segment conductors are connected through welding portions, each of which is provided in a conductor end portion of each segment conductor, wherein the conductor end portions are arranged in an annular shape in a circumferential direction in a coil end in an axial direction, and N annular rows are configured, and wherein directions of punching burr portions of a stator slot and the stator core on an inner-diameter side of the stator are inverted to a direction of a punching burr portion of the stator core on an outer-diameter side of the stator.

The present invention relates to a method for increasing the efficiency of an energy transfer device (100) with which electrical energy is converted contactlessly into electrical energy with the aid of a magnetic field in order to electrically excite a rotor of an electrical machine, comprising the step of:

arranging an additional electrically conductive material layer (13) on at least one active part (12, 19, 35, 45) of the energy transfer device (100), wherein an active part of the energy transfer device (100) is a part of the energy transfer device (100) which is at least partially exposed to the magnetic field used for energy transfer, and wherein the electrical conductivity of the additional material layer (13) is greater than the electrical conductivity of the at least one active part (12, 19, 35, 45). Moreover, the invention relates to an energy transfer device (100) and to a use of an electrically conductive material.