Stator for rotary electric machine

1. A stator for a rotary electric machine comprising:

a stator core comprising an annular yoke and a plurality of magnetic pole portions disposed radially inwardly of the yoke at intervals in a circumferential direction of the yoke, the magnetic pole portions each having a pole column with an outer end portion connected to an inner periphery of the yoke and a magnetic pole surface forming portion provided at an inner end portion of the pole column and including a magnetic pole surface facing a rotor;

a slot insulator made of a synthetic resin and fitted to the stator core to prevent a winding conductor to be wound around the pole columns of the magnetic pole portions from directly contacting the stator core;

a plurality of winding portions formed by concentratedly winding the winding conductor around the pole columns of the magnetic pole portions via the slot insulator; and

a plurality of wedge members each comprising a partition wall portion inserted into a slot formed between two adjacent magnetic pole portions to electrically insulate the two adjacent magnetic pole portions, and a block portion integrally formed with the partition wall portion to block an opening portion of the slot facing the rotor wherein

a coupling portion is formed at a non-inserted end portion, which is not inserted into the slot, of the wedge member, the coupling portion extending across an end of the partition wall portion and an end of the block portion; and

the wedge member and the coupling portion are integrally formed of a synthetic resin material.

2. The stator for a rotary electric machine according to claim 1 , wherein two or more coupling portions of two or more adjacently disposed wedge members are integrally formed as a continuous coupling portion.

3. The stator for a rotary electric machine according to claim 2 , wherein both end portions of each continuous coupling portion in the circumferential direction are shaped to overlap one end of an adjacent continuous coupling portion to form an overlapping portion having the same thickness as an intermediate portion of the continuous coupling portion located between the both end portions.

4. The stator for a rotary electric machine according to claim 3 , wherein the both end portions are shaped to be symmetric by 180° with respect to a symmetry center.

5. The stator for a rotary electric machine according to claim 1 , wherein one coupling portion is integrally formed with one wedge member, and both end portions of the one coupling portion in the circumferential direction are shaped to overlap one end of an adjacent coupling portion to form an overlapping portion having the same thickness as an intermediate portion of the coupling portion located between the both end portions.

6. The stator for a rotary electric machine according to claim 5 , wherein the both end portions are shaped to be symmetric by 180° with respect to a symmetry center.

7. The stator for a rotary electric machine according to claim 1 , wherein

a pair of gaps are formed between the magnetic pole surface forming portion of each magnetic pole portion and an opposed portion of the slot insulator that faces the magnetic pole surface forming portion;

one of the gaps communicates with the slot formed adjacent to the magnetic pole portion on one side in the circumferential direction and the other one of the gaps communicates with the slot formed adjacent to the magnetic pole portion on the other side in the circumferential direction; and

an end portion of the block portion of each wedge member inserted into the slot is fitted into the gap adjacent to the end portion of the block portion.

8. The stator for a rotary electric machine according to claim 1 , wherein the slot insulator is formed with a groove for receiving a free end of the partition wall portion of each wedge member.

9. A stator for a rotary electric machine comprising:

a stator core comprising an annular yoke and a plurality of magnetic pole portions disposed radially inwardly of the yoke at intervals in a circumferential direction of the yoke, the magnetic pole portions each having a pole column with an outer end portion connected to an inner periphery of the yoke and a magnetic pole surface forming portion provided at an inner end portion of the pole column and including a magnetic pole surface facing a rotor;

a slot insulator made of a synthetic resin and fitted to the stator core to prevent a winding conductor to be wound around the pole columns of the magnetic pole portions from directly contacting the stator core;

a plurality of winding portions formed by concentratedly winding the winding conductor around the pole columns of the magnetic pole portions via the slot insulator; and

a plurality of wedge members each comprising a partition wall portion inserted into a slot formed between two adjacent magnetic pole portions to electrically insulate the two adjacent magnetic pole portions, and a block portion integrally formed with the partition wall portion to block an opening portion of the slot facing the rotor wherein

the plurality of wedge members are integrally formed of a synthetic resin material

a pair of gaps are formed between the magnetic pole surface forming portion of each magnetic pole portion and an opposed portion of the slot insulator that faces the magnetic pole surface forming portion;

one of the gaps communicates with the slot formed adjacent to the magnetic pole portion on one side in the circumferential direction and the other one of the gaps communicates with the slot formed adjacent to the magnetic pole portion on the other side in the circumferential direction; and

an end portion of the block portion of each wedge member inserted into the slot is fitted into the gap adjacent to the end portion of the block portion.

10. The stator for a rotary electric machine according to claim 9 , wherein the slot insulator is formed with a plurality of grooves for receiving free ends of the partition wall portions of the plurality of wedge members.