STATOR OF ROTATING ELECTRIC MACHINE

• US 20090184590A1
• Filed: 12/23/2008
• Published: 07/23/2009
• Est. Priority Date: 01/17/2008
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Nakanishi, Kazuki, Maeda, Susumu
• Granted Patent: US 7,898,127 B2
• Time in Patent Office: Days
• US Class Current: 310/52
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors

Abstract

A stator of a rotating electric machine is obtained, in which material usage in a conductor connection section of a stator coil end and weight of the conductor connection section are reduced, so that vibration suppression is improved, in addition, thermal resistance between a loss occurrence portion and a cooled portion becomes smaller so that temperature rise is suppressed. It is configured that a stator has first and second wire groups disposed at an inner diameter side of a slot, third and fourth wire groups disposed at an outer diameter side of the slot, and a connection conductor for connecting the respective, two wire groups to each other in a radial direction, wherein the stator further has a connection conductor which has one end being interposed between projected ends of the first and second wire groups, and connected to the respective projected ends, and has the other end being interposed between projected ends of the third and fourth wire groups, and connected to the respective projected ends, in addition, has axial through-holes, which communicate with flow paths of coolant flow members provided between the wire groups, in the one end and the other end respectively.

Claims

1. A stator of a rotating electric machine comprising:

a stator iron core having a plurality of slots,

a plurality of first and second wire groups at an inner diameter side and third and fourth wire groups at an outer diameter side, each of the plurality of sets of first, second, third and fourth wire groups is inserted into the one of the plurality of slots in two rows and two stages, projecting from both of the slot ends in an axial direction,

a plurality of first coolant flow members, each of the plurality of first coolant flow members has a coolant flow path in an axial direction, disposed between the first wire group and the second wire group, projecting, shorter than the first and second wire groups, from both of the slot ends in an axial direction,

a plurality of second coolant flow members, each of the plurality of second coolant flow members has a coolant flow path in an axial direction, disposed between the third wire group and the fourth wire group, projecting, shorter than the third and fourth wire groups, from both of the slot ends in an axial direction,

a plurality of connection conductors, each of the plurality of connection conductors is interposed between one of the projected ends of the first and second wire groups, and has axial through-holes, which communicate with the flow path of the first coolant flow member, in such an interposed region, and is interposed between one of the projected ends of the third and fourth wire groups, and has axial through-holes, which communicate with the flow path of the second coolant flow member, in such an interposed region, and connects between one of the projected ends of the first and second wire groups and one of the projected ends of the third and fourth wire groups.

3. The stator of a rotating electric machine according to claim 1,

wherein thickness in a circumferential direction of the connection conductor is made large compared with thickness in the circumferential direction of each of the first coolant flow member and the second coolant flow member.

5. The stator of a rotating electric machine according to claim 3,

wherein the axial through-holes provided in the connection conductor are made to have a circular section respectively, and arranged in a zigzag.

7. The stator of a rotating electric machine according to claim 1,

wherein the axial through-holes provided in the connection conductor are placed in positions at least 10 mm away from a surface at an outer diameter side of the first and second wire groups, and placed in positions at least 10 mm away from a surface at an inner diameter side of the third and fourth wire groups, respectively.

2. A stator of a rotating electric machine comprising:

a stator iron core having a plurality of slots;

a plurality of first, second, fifth and sixth wire groups at an inner diameter side and eighth, seventh, fourth and third wire groups at an outer diameter side, each of the plurality of sets of first, second, fifth, sixth, eighth, seventh, fourth and third wire groups is inserted into the one of the plurality of slots in four rows and two stages, projecting from both of the slot ends in an axial direction;

a plurality of first coolant flow members, each of the plurality of first coolant flow members has a coolant flow path in an axial direction, disposed between the first wire group and the second wire group, projecting, shorter than the first and second wire groups, from both of the slot ends in an axial direction;

a plurality of second coolant flow members, each of the plurality of second coolant flow members has a coolant flow path in an axial direction, disposed between the third wire group and the fourth wire group, projecting, shorter than the third and fourth wire groups, from both of the slot ends in an axial direction;

a plurality of third coolant flow members, each of the plurality of third coolant flow members has a coolant flow path in an axial direction, disposed between the fifth wire group and the sixth wire group, projecting, shorter than the fifth and sixth wire groups, from both of the slot ends in an axial direction;

a plurality of fourth coolant flow members, each of the plurality of fourth coolant flow members has a coolant flow path in an axial direction, disposed between the seventh wire group and the eighth wire group, projecting, shorter than the seventh and eighth wire groups, from both of the slot ends in an axial direction;

a plurality of first connection conductors, each of the plurality of first connection conductors is interposed between one of the projected ends of the first and second wire groups, and has axial through-holes, which communicate with the flow path of the first coolant flow member, in such an interposed region, and is interposed between one of the projected ends of the third and fourth wire groups, and has axial through-holes, which communicate with the flow path of the second coolant flow member, in such an interposed region, and connects between one of the projected ends of the first and second wire groups and one of the projected ends of the third and fourth wire groups;

a plurality of second connection conductors, each of the plurality of second connection conductors is interposed between one of the projected ends of the fifth and sixth wire groups, and has axial through-holes, which communicate with the flow path of the third coolant flow member, in such an interposed region, and is interposed between one of the projected ends of the seventh and eighth wire groups, and has axial through-holes, which communicate with the flow path of the fourth coolant flow member, in such an interposed region, and connects between one of the projected ends of the fifth and sixth wire groups and one of the projected ends of the seventh and eighth wire groups.

4. The stator of a rotating electric machine according to claim 2,

wherein thickness in a circumferential direction of the connection conductor is made large compared with thickness in the circumferential direction of each of the first coolant flow member, the second coolant flow member, the third coolant flow member and the fourth coolant flow member.

6. The stator of a rotating electric machine according to claim 4,

wherein the axial through-holes provided in the connection conductor are made to have a circular section respectively, and arranged in a zigzag.

8. The stator of a rotating electric machine according to claim 2,

wherein the axial through-holes provided in the connection conductor are placed in positions at least 10 mm away from a surface at an outer diameter side of the first, second, fifth and sixth wire groups, and placed in positions at least 10 mm away from a surface at an inner diameter side of the third, fourth, seventh and eighth wire groups, respectively.