Stator for rotating electrical machine, rotating electrical machine, and method of producing stator for rotating electrical machine
A stator for a rotating electrical machine includes a stator coil, a stator iron core having slots into which the stator coil is mounted, and insulating slot liners inserted into the slots, wherein conductive wire materials constituting the stator coil are inserted into the slot liners, and sections of the slot liners protruding from the slots are each provided with a bellows portion.
1. A stator for a rotating electrical machine comprising:
a stator coil;
a stator iron core having slots into which the stator coil is mounted; and
insulating slot liners inserted into the slots, wherein
conductive wire materials constituting the stator coil are inserted into the slot liners,
sections of the slot liners protruding from the slots are each provided with a bellows portion, and
the bellows portion comprises a plurality of folds that are immediately adjacent to one another and that are located between the stator coil and the slot liners.
2. The stator for a rotating electrical machine according to claim 1 , wherein the protruding sections of the slot liners are each provided with a linear portion between the bellows portion and the stator iron core.
3. The stator for a rotating electrical machine according to claim 1 , wherein the slot liners each include insulating paper.
4. The stator for a rotating electrical machine according to claim 1 ,
wherein the conductive wire materials are each provided with a bended section adjoining to the stator iron core at a coil end section of the stator coil; and
the bended sections abut onto the bellows portions of the slot liners.
5. The stator for a rotating electrical machine according to claim 1 , wherein the stator coil is wound around the stator iron core by distributed winding.
6. The stator for a rotating electrical machine according to claim 1 , wherein the protruding section is located at each end of the slot liner.
7. The stator for a rotating electrical machine according to claim 1 , wherein the conductive wire materials each include a flat wire covered with insulating coat.
8. A rotating electrical machine comprising:
a stator; and
a rotor opposed to the stator, wherein
the stator includes a stator coil, a stator iron core having slots into which the stator coil is mounted and insulating slot liners inserted into the slots,
conductive wire materials constituting the stator coil are inserted into the slot liners,
sections of the slot liners protruding from the slots are each provided with a bellows portion, and
the bellows portion comprises a plurality of folds that are immediately adjacent to one another and that are located between the stator coil and the slot liners.
9. The rotating electrical machine according to claim 8 , wherein the stator is cooled by a liquid refrigerant.
10. A method of producing a stator for a rotating electrical machine comprising the steps of:
inserting insulating slot liners into slots of a stator iron core;
inserting conductive wire materials constituting a stator coil and each provided with a bended section into the slot liners inserted into the slots; and
pressing sections of the slot liners protruding from the slots by the bended sections of the conductive wire materials so as to form a bellows portion on each of the protruding sections, wherein the bellows portion comprises a plurality of folds that are immediately adjacent to one another and that are located between the stator coil and the slot liners.
11. The method according to claim 10 , wherein a coil stopper jig is disposed between the protruding sections of the slot liners adjoining to each other before the conductive wire materials are inserted into the slot liners.
12. The method according to claim 10 , wherein tip end portions of the protruding sections of the slot liners adjoining to each other are widened before the conductive wire materials are inserted into the slot liners.