Patent ID: 7994677
Filing Date: 2011-08-09
Classification: H02K

Abstract:
1. A stator for a multiple-phase rotary electric machine, the stator facing a rotor, the stator comprising: 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, 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 reverses 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 of slots in the circumferential direction, the return portion of the winding for each phase has a joined portion having both ends connected to said two turn portions, respectively, one of the two turn portions, which is connected to one of the ends 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 of the ends 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 joined portion is disposed in a predetermined designated slot among the designated slots so that the winding reverses the winding direction thereof at the predetermined designated slot.