Stator winding for rotary electric machine, stator for rotary electric machine, method of manufacturing stator for rotary electric machine, and jig used in manufacturing stator for rotary electric machine
A stator winding of a rotary electric machine includes windings for each pole of each phase being configured by a single layer lap wound coil. The single layer lap-wound coil includes combination coils each configured by two or more divided unit coils of the same phase being disposed one over the other in a radial direction inside slots of a stator core. The combination coils each comprise a first-row unit coil and a second-row unit coil disposed in a radially inner side of the stator core with respect to the first-row unit coil. A turns count of the first-row unit coil equals a turns count of the second-row unit coil. A count of lead wires of the first-row unit coil differs from a count of lead wires of the second-row unit coil.
1. A stator winding of a rotary electric machine comprising:
windings for each pole of each phase being configured by a single layer lap wound coil, the single layer lap-wound coil comprising combination coils each configured by two or more divided unit coils of the same phase being disposed one over the other in a radial direction inside slots of a stator core;
wherein the combination coils each comprise a first-row unit coil and a second-row unit coil disposed in a radially inner side of the stator core with respect to the first-row unit coil;
wherein a turns count of the first-row unit coil equals a turns count of the second-row unit coil; and
wherein a count of lead wires of the first-row unit coil differs from a count of lead wires of the second-row unit coil.
2. The stator winding of a rotary electric machine according to claim 1 , wherein the combination coils have the same coil pitch.
3. The stator winding of a rotary electric machine according to claim 2 , wherein the coil pitch is either of 116.7%, 100%, 83.3%, and 50%.
4. The stator winding of a rotary electric machine according to claim 1 , wherein each of the combination coils comprise windings having two or more wire diameters, wherein among the unit coils, a unit coil disposed in the radially inner side of the stator core includes a wiring having the greater of the two or more wire diameters, and wherein among the unit coils, a perimeter of the unit coil disposed in the radially inner side of the stator core is less than a perimeter of the unit coil disposed in the radially outer side of the stator core.
5. A stator of a rotary electric machine provided with the stator winding of a rotary electric machine according to claim 1 , the stator being provided with an insulation sheet between each of the unit coils disposed adjacent in the radial direction of the stator core.
6. A method of manufacturing a stator of a rotary electric machine provided with the stator winding of a rotary electric machine according to claim 1 , comprising:
inserting an X−1th row unit coil into the slots, where X is an integer equal to or greater than 2 and represents a count of rows of the unit coils;
fitting a coil retaining jig with the stator core to enclose an opening of the slots; and
pushing the coil retaining jig apart from the stator core and inserting an Xth row unit coil into the slots.
7. A jig used in the method of manufacturing a stator of a rotary electric machine according to claim 6 comprising:
a main portion configured to be fitted to the stator core; and
a retaining portion protruding from the main portion and being configured to be inserted into the slots to enclose openings of the slots and thereby preventing the unit coils from coming out of the slots.