Stator for rotary electric machine, and rotary electric machine using the stator

A rotary electric machine comprising:

• a rotor;
• and
• a stator having multiple phases and facing the rotor,
• wherein the stator comprises:
• a stator core formed into a cylinder having an axial direction, a radial direction, and a circumferential direction and formed to have a plurality of slots each extending in the axial direction and arranged in the circumferential direction;
• and
• a coil formed of a plurality of windings for individual phases of the machine, the windings being wound in and around the respective plurality of slots,
• wherein the winding for each phase has a plurality of slot-accommodated portions accommodated respectively in slots designated therefor among said plurality of slots and a plurality of turn portions each connecting mutually adjacently located two of the slot-accommodated portions thereof, outside of the slots in the axial direction, the slot-accommodated portions including a return portion that connects two of the turn portions so that the winding for each phase returns a winding direction thereof in the circumferential direction,
• wherein the winding for each phase has a first winding and a second winding electrically connected in series to each other, the slot-accommodated portions of the first and second windings being alternately stacked in each of said slots designated therefor in the radial direction, the designated slots being located every predetermined number of slots among the plurality slots in the circumferential direction,
• the return portion of the winding for each phase has a joined portion having both ends connected to the two turn portions, respectively, one of the two turn portions, which is connected to one end of the return portion, being connected to one mutually adjacently located slot-accommodated portion accommodated at the same level as an in-slot level of the return portion in the radial direction, and the other of the two turn portions, which is connected to the other end of the return portion, being connected to another mutually adjacently located slot-accommodated portion accommodated at a different level from the in-slot level of the return portion in the radial direction, and
• the turn portions include remaining turn portions which are at a same circumferential position as the turn portion connected to the one end of the return portion, the remaining turn portions being arranged outside one of the axial ends of the stator core so as to be shifted farther, in a direction departing from the rotor in the radial direction, than in-slot stacked positions of slot-accommodated portions connected to the remaining turn portions, and
• wherein the rotor is provided with N and S magnetic poles arranged alternately in the circumferential direction and arranged to face the stator, the rotor being located either inside or outside of the stator in the radial direction.