A terminal unit of a vehicle traction motor includes a terminal mold, bus bars which are assembled and fixed in within the terminal mold, and insulation spacers which are alternately and sequentially inserted and assembled between the bus bars and have different diameters from each other.

In one possible embodiment, a motor winding is provided having a high density multi-conductor wire bundle with a compacted Litz wire bundle. The compacted Litz wire bundle has a serpentine configuration with a central portion having compacted Litz wire and end turns having non-compacted Litz wire.

A winding for an electric machine is provided. The electric machine includes conductor bars which are arranged one above the other and each of which has a cooling slot. The conductor bars are designed such that the height of the conductor bars increases in the radial direction and the effective cooling cross-section decreases in the radial direction.

An electrical induction motor includes a plurality of windings, and a plurality of contactors. Each of the plurality of contactors is configured to be selectively opened or closed in a circuit including the plurality of windings to selectively connect the windings together in a star configuration wherein current flowing through the windings results in the generation of 2N magnetic poles, with N equal to the number of phases of the motor. Each of the plurality of contactors is also configured to be selectively opened or closed in the circuit including the plurality of windings to selectively connect the windings together in a mesh configuration wherein current flowing through the windings results in the generation of two magnetic poles.

In a stator having a stator core and three phase windings, slots are formed in the stator core. The phase winding are accommodated in layers, from one side to the other side in the corresponding slot along a radial direction of the stator core. The phase windings are arranged in a star-delta composite connection structure. The phase winding in each phase is comprised of conductors accommodated in a first slot and a second slot adjacently arranged in the stator core so that the conductor in the n-th layer is electrically connected to the conductor in the (n+1)-th layer, ascending order, per slot. Because each winding has the same length and no difference in electric potential occurs between the star connection and the delta connection, this structure suppress generation of operation noise and a circulating current through the stator core and prevents loss due to the circulating current.

A motor according to an embodiment disclosed herein comprises: a stator; a rotor disposed inside the stator; a shaft coupled to the rotor; a bus bar disposed on the stator; boards in which a plurality of holes are formed so that the ends of terminals of the bus bar are disposed therein; and soldering members disposed in the holes so that the terminals and the boards are electrically connected. The boards comprise: a body in which the holes are formed; wiring patterns formed around the holes; and a plurality of passes extending from the wiring patterns to the holes, wherein a non-conductive region is disposed between the passes. Accordingly, the bus bar in the motor can be made compact by using the plurality of terminals which maintain a certain spacing between one another even when some are disposed on the same plane. In addition, the motor forms a heat dissipation structure through the passes formed in each of the plurality of boards, and thus can minimize the rate of defects due to soldering.

A high temperature superconducting (HTS) magnet coil disposed within a cryostat is configured with a thermo-siphon cooling system containing a liquid cryogen. The cooling system is configured to indirectly conduction cool the HTS magnet coil by nucleate boiling of the liquid cryogen that is circulated by the thermo-siphon in a cooling tube attached to a heat exchanger bonded to the outside surface of the HTS magnet coil. A supply dewar is configured with a re-condenser cryocooler coldhead to recondense boiloff vapors generated during the nucleate boiling process.

A lead wire connection structure includes a rectifier that is arranged at the outside or the inside in an axis direction of the brackets so as to rectify AC voltage, which is generated on the stator, to DC voltage; in which, when a number of conductors of a connecting portion, at which lead conductors of the stator winding and the rectifier are connected, is N (N is integer and greater than or equal to 2) per one position, conductors, of which number is less than or equal to N1 per one position, are connected at the connecting portion, and conductors excepted from the conductors, of which number is less than or equal to N1, are welded onto the remaining conductors at a position being nearer the stator winding side than the connecting portion.

A rotating electrical device comprising a circuit section being disposed offset from a motor section to one side or another side, in a direction orthogonal to an axial direction of the motor section as viewed in the axial direction of the motor section; a stator configuring the motor section together with a rotor, the stator comprising a plurality of teeth formed in a radial shape and a plurality of windings that each includes a terminal-end portion that extends in the axial direction of the motor section, the plurality of windings being respectively wound on any of the plurality of teeth such that each of the terminal-end portions is disposed further to a side in the orthogonal direction from a central axis of the motor section where the circuit section is disposed; and a plurality of terminals that wire-in the circuit section and the terminal-end portions of the plurality of windings.

The invention is the compact multiphase wave winding of a high specific torque electric machine The invention is the compact multiphase wave winding (6) of the electric machine. Winding (6) is filling the slots (5) of the stator ferromagnetic core (3) and comprise one or multiple layers (40). Winding (6) fills the slots (5). Winding comprise N or a multiple on N conductors (8), where N represents the number of winding phases. Conductor (8) comprises or is assembled by parallel straight segments (10) and winding overhangs (11). Between the two straight segments (10) of one conductor (8) there are N teeth (4) and N1 slots (5) or N+1 teeth (4) and N slots (5). Straight segments are connected by winding overhangs which shape in tangential axial plane differs for less than one sixth of magnetic period (7) from ellipse shape with one axis equal to half of magnetic period (7) and other axis length between half and three quarters of magnetic period (7) length.