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.

An electric motor for high speed operation use and a rotor which enables use of common parts with electric motors for low speed operation use and which thereby enables reduction of the manufacturing costs. The rotor is provided with a shaft, a rotor core which is fastened to the shaft at the outside in the radial direction and has a first end face at one end in the axial direction and a second end face at the other end in the axial direction, a plurality of conductors which are arranged at the rotor core, and a pair of end rings which are respectively arranged adjoining the first end face and the second end face and which short-circuit the plurality of conductors with each other. The shaft has an outer circumference, while the end rings have outer circumferences which are arranged concentrically with respect to the outer circumference of the shaft.

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 rotor with a non-through shaft for a rotary electric machine comprises a cylindrical magnetic body clamped between two half-shafts, each comprising an attachment flange connected to the magnetic body, axial housings being uniformly provided in the magnetic body on at least one diameter of the magnetic body in order to house conductive bars. At least one attachment flange comprises insertion holes, each arranged facing a housing for inserting the conductive bars into the housings and the exterior diameter of the attachment flange is substantially equal to the exterior diameter of the magnetic body, the attachment flange comprising as many insertion holes as housings.

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 pressure die casting process and its machine are described to produce a highly efficient copper rotor for AC induction motors widely used in various industries. The pressure die casting process and the machine facilitate improvement in efficiency and performance of AC induction motors by providing maximum filling of copper with minimum porosity. Thus, a compact and convenient method is provided to cast a wide range of copper rotors of various extensive length.

A pressure die casting process and its machine are described to produce a highly efficient copper rotor for AC induction motors widely used in various industries. The pressure die casting process and the machine facilitate improvement in efficiency and performance of AC induction motors by providing maximum filling of copper with minimum porosity. Thus, a compact and convenient method is provided to cast a wide range of copper rotors of various extensive length.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.