Abstract: A rotor for an electric rotating machine includes a hollow cylindrical rotor core, a plurality of permanent magnets, at least one annular plate and a plurality of heat conductors. The rotor core has a pair of axial end faces that are opposite to each other in the axial direction of the rotor core. The permanent magnets are embedded in the rotor core so as to be spaced from one another in the circumferential direction of the rotor core. The at least one annular plate is disposed in abutment with a corresponding one of the axial end faces of the rotor core. The heat conductors are embedded in the rotor core. Each of the heat conductors extends so as to have an end thereof abutting the at least one annular plate.

Abstract: A rotor for an electric rotating machine is provided. The rotor includes a shaft and a core which is fastened to an outer periphery surface of the shaft by shrink fitting. The shaft includes a fastening portion to which the core is fastened. A diameter of the fastening portion is smaller than a diameter of at least one other portion of the shaft.

Abstract: A rotor includes a hollow cylindrical rotor core and permanent magnets embedded in the rotor core to form a plurality of magnetic poles on the radially outer periphery of the rotor core. The rotor core has a plurality of openings each of which extends in the axial direction of the rotor core so as to penetrate it. When viewed along the axial direction, each of the openings is symmetrically positioned with respect to the centerline of a corresponding one of the magnetic poles. For each of the openings, there are provided n reinforcing portions, where n is an integer not less than 2. The n reinforcing portions extend to connect a pair of radially-inner and radially-outer peripheral portions of the rotor core, thereby partitioning the opening into (n+1) parts. The n reinforcing portions are symmetrically arranged with respect to the centerline of the corresponding magnetic pole.

Abstract: A stator for an electric rotating machine is equipped with a stator winding made up of a plurality of conductor segments. Each of the conductor segments has a head and two legs. The legs are inserted through their respective slots formed in a stator core, so that each of the conductor segments has leg ends protruding from either one of opposed end surfaces of the stator core and the head thereof protruding from the other end surface. Radially adjacent two of the leg ends are provided as a coil end pair to be welded. At least one of the heads is interposed between adjacent two of the coil end pairs, thereby ensuring a distance between the two adjacent coil end pairs which is great enough to provide a required degree of electric insulation between the coil end pairs when the leg ends of the conductor segments are welded electrically.

Abstract: A method of welding a plurality of conductors to form a winding extending through an annular stator core. The conductors are inserted into slots formed in the stator core to have coil ends extending outside an end surface of the stator core. A plurality of pairs of the coil ends are arranged in diagonal arrays extending diagonally with respect to a radial direction of the stator core. The method inserts a first electrode into a gap between adjacent two of the diagonal arrays and then brings a second electrode close to one of the adjacent two of the diagonal arrays to arc-weld, the pairs of the coil ends. This welding method enables the welding of the coil ends arrayed in the above layout efficiently while keeping the electrical insulation between the pairs of the coil ends.

Abstract: A stator for an electric rotating machine is provided which includes a stator winding made up of a plurality of conductor segments. Each of the conductor segments has a leg which includes an in-slot portion into one of slots of a stator core and a protrusive end extending outside the slot. The protrusive ends of the conductor segments are welded together to form a stator winding. The conductor segments are broken down into first conductor segments and second conductor segments. The protrusive ends of the first and second conductor segments include outwardly-oriented bends and inwardly-oriented bends for increasing an interval between every pair of adjacent two of the protrusive ends to be welded, thus ensuring a required degree of electrical insulation between the pairs of the protrusive ends and permits the height of a coil end of the stator winding to be decreased.

Abstract: A stator core of a rotating electrical machine, in which no compressive load is applied to divided cores each having an arc shape, when the divided cores are secured into a circular form, thereby decreasing the motor loss and improving the motor efficiency. The divided cores are circularly disposed, and the divided cores each having the arc shape in section perpendicular to the axial direction of the rotary axis. In the divided cores, there are provided welded portions each of which is diagonally formed between one corner end of a connecting edge and an opposite corner end of a neighboring connecting edge, thereby providing the welded portion diagonal with respect to the axial direction. The connecting edges are in parallel to the axial direction.

Abstract: A rotor for an electric rotating machine includes a rotor core and a plurality of magnetic poles. The rotor core is formed of a plurality of magnetic steel sheets laminated in the axial direction of the rotor core. The magnetic poles are formed on a radially outer periphery of the rotor core. The magnetic poles are arranged at predetermined intervals in the circumferential direction of the rotor core so that the polarities of the magnetic poles alternate between north and south in the circumferential direction. Furthermore, the magnetic steel sheets forming the rotor core are welded so that a plurality of welds are formed on one of radially outer and inner surfaces of the rotor core. Each of the welds has a pair of axial end portions that are offset from each other in the circumferential direction of the rotor core and electrically connected to each other.

Abstract: A segment core forms an annular-shaped stator core of a rotary electric machine. The stator core is formed into an annular shape by circumferentially connecting a plurality of segment cores, each segment core having a L shape and includes a yoke portion that forms the outer periphery of the stator core, a tooth portion that extends from the yoke portion to the rotary axis in a radial direction of the stator core, and a steel plate where the yoke portion and the tooth portion are formed wherein one edge of the segment core linearly extends along the yoke portion and the tooth portion in the radial direction of the stator core, the other edge forms a projection in the yoke portion jutting out from the tooth portion in the circumferential direction whereby a segment core is formed into a shape of an L.

Abstract: A method of manufacturing a stator includes: (a) preparing a stator core and electric wires; (b) assembling together the stator core and the electric wires; (c) welding corresponding pairs of the electric wires to form a stator coil, wherein for each corresponding pair of the electric wires, end portions of the electric wires are radially bent toward each other to have distal end surfaces thereof abutting each other at a position axially outside an annular coil end part of the stator coil, the distal end surfaces are welded together to form a weld between the end portions, and the end portions together make up a crossover part that extends to cross over the coil end part; and (d) deforming, for each corresponding pair of the electric wires, the end portions so as to reduce an axial distance between the coil end part and the crossover part.

Abstract: A stator for an electric rotating machine includes a hollow cylindrical stator core having a plurality of slots and a stator coil formed by joining a plurality of electric wires mounted on the stator core. For each joined pair of the electric wires, one of the electric wires has an end portion led out from the radially inner periphery of one of the slots of the stator core while the other electric wire has an end portion led out from the radially outer periphery of another one of the slots of the stator core; the end portions are welded together to form a weld therebetween. Part of the welds formed between the end portions of the joined pairs of the electric wires are located on the radially inner periphery of the stator coil while the remaining welds are located on the radially outer periphery of the stator coil.

Abstract: A stator for an electric rotating machine includes a hollow cylindrical stator core and a multi-phase stator coil comprised of a plurality of electric wires mounted on the stator core. The stator coil includes a plurality of phase windings each of which is formed of at least two electric wires. One of the two electric wires has an end portion led out from the radially inner periphery of one slot of the stator core while the other electric wire has an end portion led out from the radially outer periphery of another slot of the stator core. The end portions of the two electric wires are joined together to form a joint therebetween. The joint is positioned axially outward of a coil end part of the stator coil, which protrudes from an axial end face of the stator core, without radially protruding from the coil end part.

Abstract: A rotary electric machine configured with a stator, rotor, and permanent magnets disposed in an inverted V-shape that becomes gradually narrower from a side of a center of rotation of the rotor. The rotor is provided with a plurality of support portions that extend radially about the center of rotation, and gap portions are respectively formed in correspondence with the plurality of support portions at positions spaced by a predetermined distance from an edge portion of the permanent magnets in a flowing direction of magnetic flux between the permanent magnets and the stator. The gap portions are formed to have such a length that causes magnetic saturation during generation of low torque in a low-current state and that causes no magnetic saturation during generation of maximum torque in a high-current state in which electricity at a high current is supplied to the stator coil.

Abstract: In a stator, when a number of a plurality of core segments circumferentially arranged is represented as n, a length of a maximum projecting portion of a circumferential projection of each of the plurality of core segments from one of the first and second radial sides thereof is represented as p, a radial length of a maximum projecting portion of the circumferential projection of each of the plurality of core segments from a circumferentially extended line from the bottom of the slot is represented as q, and a length of the slot with respect to the bottom thereof in a radial direction of the stator core assembly is represented as t, the number n, the length p, the length q, and the length t meet the following equation: 0 < np ? - q < t .

Abstract: The electric rotating machine includes a rotor relatable around a rotating shaft disposed horizontally, a stator core formed with slots, and a stator coil constituted of in-slot portions each of which is accommodated in a corresponding one of the slots, and turn portions each of which connects corresponding adjacent two of the in-slot portions at a position outside the stator core. The turn portions form a coil end projecting axially outward from an end surface of the stator core at each of both axial end sides of the stator core. The coil end is formed in a cylindrical shape including an axial end surface of a flat shape, and inner and outer peripheral surfaces of a circular shape. The electric rotating machine further includes a coolant supply section to supply coolant to an upper part of the outer peripheral surface of the coil end.

Abstract: In a stator, when a number of a plurality of core segments circumferentially arranged is represented as n, a length of a maximum projecting portion of a circumferential projection of each of the plurality of core segments from one of the first and second radial sides thereof is represented as p, a radial length of a maximum projecting portion of the circumferential projection of each of the plurality of core segments from a circumferentially extended line from the bottom of the slot is represented as q, and a length of the slot with respect to the bottom thereof in a radial direction of the stator core assembly is represented as t, the number n, the length p, the length q, and the length t meet the following equation: 0 < np ? - q < t

Abstract: At each permanent magnet in a rotor of an IPM rotary electric machine, each of a pair of flux barriers respectively disposed adjoining circumferentially opposed side faces of the magnet is formed with a trench portion that extends farther from a circumferential face of the rotor than a position on a corresponding side face that is located farthest, on that side face, from the rotor circumferential face. This prevents part of a flow of magnetic flux, from the stator through the rotor, from being diverted to flow into the magnet. Increased torque or output power is thereby achieved.

Abstract: At each permanent magnet in a rotor of an IPM rotary electric machine, each of a pair of flux barriers respectively disposed adjoining circumferentially opposed side faces of the magnet is formed with a trench portion that extends farther from a circumferential face of the rotor than a position on a corresponding side face that is located farthest, on that side face, from the rotor circumferential face. This prevents part of a flow of magnetic flux, from the stator through the rotor, from being diverted to flow into the magnet. Increased torque or output power is thereby achieved.