Rotary electric machine

Patent metadata

Field	Value
Publication number	US-10164491-B2
Application number	US-201415107524-A
Country	US
Kind code	B2
Filing date	Jan 17, 2014
Priority date	Jan 17, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Winding bodies are produced by repeatedly winding a δ-shaped coil pattern that is formed by inserting the conductor wire sequentially into a second slot, a first slot, a second slot, and a third slot, so as to alternate an axial direction of insertion into the first slot, the second slot, and the third slot, for two turns in a radial direction, and are configured such that a plurality of rectilinear portions that are respectively inserted into the first slot, the second slot, and the third slot are linked continuously by coil end portions, and a liquid coolant is supplied to a coil end that is constituted by the coil end portions.

First claim

The invention claimed is:

1. A rotary electric machine comprising:
a housing;
a rotor that is fixed to a shaft that is rotatably supported by said housing such that said rotor is disposed inside said housing;
a stator that includes:
an annular stator core in which slots are arranged circumferentially; and
a stator winding that is mounted to said stator core,
said stator being held on an outer circumferential side of said rotor by said housing such that an air gap is interposed between said stator and said rotor; and
a cooling mechanism that supplies a liquid coolant to a coil end of said stator winding to cool said stator winding,
wherein:
said stator winding includes a plurality of winding bodies that are each produced by winding a jointless continuous conductor wire that is coated with insulation, and that are arranged at a pitch of one slot in a circumferential direction so as to be mounted into a first slot, a second slot, and a third slot that line up at an angular spacing of n slots in a circumferential direction, where n is a natural number that is greater than or equal to two;
said winding bodies are produced by repeatedly winding a δ-shaped coil pattern that is formed by inserting said conductor wire sequentially into said second slot, said first slot, said second slot, and said third slot, so as to alternate an axial direction of insertion into said first slot, said second slot, and said third slot, form turns in a radial direction, where m is a natural number that is greater than or equal to one, and are configured such that a plurality of rectilinear portions that are respectively inserted into said first slot, said second slot, and said third slot are linked continuously by coil end portions;
said coil end is constituted by said coil end portions; and
said liquid coolant that is supplied to said coil end flows through a gap between circumferentially adjacent coil end portions among said coil end portions.

2. The rotary electric machine according to claim 1 , wherein positions at which said rectilinear portions of said winding bodies are housed in a radial direction inside said first slot, said second slot, and said third slot are shifted sequentially in a first radial direction by an amount equal to a radial thickness of said rectilinear portions sequentially in order of said second slot, said first slot, said second slot, and said third slot.

3. The rotary electric machine according to claim 2 , wherein:
said rectilinear portions are housed in 4 m layers so as to be arranged in a single row in each of said slots; and
directions in which said coil end portions extend outward circumferentially from said rectilinear portions that are housed in said slots that are radially adjacent are repeated radially so as to alternate between an identical direction and an opposite direction.

4. The rotary electric machine according to claim 1 , wherein a strip-shaped partitioning member is disposed around an entire circumference of said coil end between coil end portions that differ in phase among said coil end portions.

5. The rotary electric machine according to claim 1 , wherein a gap between root portions of circumferentially adjacent coil end portions among said coil end portions is larger than said air gap.

6. The rotary electric machine according to claim 1 , wherein a strip-shaped partitioning wall member is disposed on an inner circumferential side of said coil end so as to be in contact with said coil end around an entire circumference.

7. The rotary electric machine according to claim 1 , wherein said cooling mechanism is configured such that said liquid coolant is sprayed onto said coil end from a radially outer side.

8. The rotary electric machine according to claim 7 , wherein said liquid coolant is sprayed onto said coil end so as to be parallel to a direction of inclination of coil end portions that are positioned radially outermost among said coil end portions.

9. The rotary electric machine according to claim 1 , wherein said cooling mechanism is configured such that said liquid coolant is sprayed onto said coil end from a radially inner side.

10. A rotary electric machine comprising:
a housing;
a rotor that is fixed to a shaft that is rotatably supported by said housing such that said rotor is disposed inside said housing;
a stator that includes:
an annular stator core in which slots are arranged circumferentially; and
a stator winding that is mounted to said stator core, said stator being held on an outer circumferential side of said rotor by said housing such that an air gap is interposed between said stator and said rotor; and
a pump that supplies a liquid coolant to a coil end of said stator winding to cool said stator winding,
wherein:
said stator winding includes a plurality of winding bodies that are each produced by winding a jointless continuous conductor wire that is coated with insulation, and that are arranged at a pitch of one slot in a circumferential direction so as to be mounted into a first slot, a second slot, and a third slot that line up at an angular spacing of n slots in a circumferential direction, where n is a natural number that is greater than or equal to two;
said winding bodies are produced by repeatedly winding a δ-shaped coil pattern that is formed by inserting said conductor wire sequentially into said second slot, said first slot, said second slot, and said third slot, so as to alternate an axial direction of insertion into said first slot, said second slot, and said third slot, form turns in a radial direction, where m is a natural number that is greater than or equal to one, and are configured such that a plurality of rectilinear portions that are respectively inserted into said first slot, said second slot, and said third slot are linked continuously by coil end portions;
said coil end is constituted by said coil end portions; and
said liquid coolant that is supplied to said coil end flows through a gap between circumferentially adjacent coil end portions among said coil end portions.

11. The rotary electric machine according to claim 10 , wherein positions at which said rectilinear portions of said winding bodies are housed in a radial direction inside said first slot, said second slot, and said third slot are shifted sequentially in a first radial direction by an amount equal to a radial thickness of said rectilinear portions sequentially in order of said second slot, said first slot, said second slot, and said third slot.

12. The rotary electric machine according to claim 11 , wherein:
said rectilinear portions are housed in 4 m layers so as to be arranged in a single row in each of said slots; and
directions in which said coil end portions extend outward circumferentially from said rectilinear portions that are housed in said slots that are radially adjacent are repeated radially so as to alternate between an identical direction and an opposite direction.

13. The rotary electric machine according to claim 10 , wherein a strip-shaped partitioning member is disposed around an entire circumference of said coil end between coil end portions that differ in phase among said coil end portions.

14. The rotary electric machine according to claim 10 , wherein a gap between root portions of circumferentially adjacent coil end portions among said coil end portions is larger than said air gap.

15. The rotary electric machine according to claim 10 , wherein a strip-shaped partitioning wall member is disposed on an inner circumferential side of said coil end so as to be in contact with said coil end around an entire circumference.

Assignees

• Mitsubishi Electric Corp

Inventors

• Horii Masaki
• Sakaue Atsushi
• Inoue Masaya

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/24 Primary

  with channels or ducts for cooling medium between the conductors · CPC title

• H02K1/32

  with channels or ducts for flow of cooling medium · CPC title