Axial-gap motor-generator

Patent metadata

Field	Value
Publication number	US-10003230-B2
Application number	US-201615158588-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	May 19, 2015
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

An axial-gap motor-generator includes a case, a rotor, a stator, a cooling plate, an air inlet, an outlet, an airflow generating groove, and a radial groove. The rotor is rotatable around a rotating shaft. The stator is fixed to the case. The stator has a first distal end and a second distal end. The first distal end faces the rotating shaft. The cooling plate is in contact with the second distal end. The stator is disposed between the rotating shaft and the cooling plate. The first distance between the air inlet and the rotating shaft is smaller than a second distance between the air outlet and the rotating shaft. The airflow generating groove is provided between the case and the rotor. The radial groove is provided between the case and the cooling plate via which the airflow generation groove is connected to the air outlet.

First claim

What is claimed is:

1. An axial-gap motor-generator that operates as a motor or a generator, the axial-gap motor-generator comprising:
a case;
a rotor that is accommodated in and rotatably supported by the case, the rotor including a magnet;
a stator that is accommodated in and fixed to the case, the stator including a coil that faces the magnet in an axial direction of a rotating shaft of the rotor; and
a cooling plate that is disposed on an outer side of the stator in a radial direction,
wherein the case includes an air inlet provided in an inner region in the radial direction and an air outlet provided in an outer region in the radial direction, the air outlet being formed between the cooling plate and the case in the axial direction,
wherein the rotor includes an airflow generating groove in an end surface thereof that faces in the axial direction, the airflow generating groove having an extending length in the radial direction,
wherein the cooling plate includes a radial groove in an end surface thereof that faces in the axial direction, the radial groove extending in the radial direction, and
wherein the cooling plate is in contact with an outer peripheral edge of the stator.

2. The axial-gap motor-generator according to claim 1 , wherein the air inlet is formed in an end surface of the case that faces in the axial direction in the inner region in the radial direction, and the air outlet is formed in an outer peripheral surface of the case.

3. The axial-gap motor-generator according to claim 1 , wherein the stator includes a disc-shaped substrate formed of an insulator that supports the coil, and
wherein the cooling plate is formed of a metal or ceramic material having a central opening edge that is in contact with the substrate.

4. The axial-gap motor-generator according to claim 1 , wherein the airflow generating groove is formed in each of end surfaces of the rotor in the axial direction.

5. The axial-gap motor-generator according to claim 1 , wherein the airflow generating groove is formed in an end surface of the rotor that faces the stator, and an airflow generating rib is formed on an end surface of the rotor that does not face the stator, the airflow generating rib having an extending length in the radial direction.

6. The axial-gap motor-generator according to claim 1 ,
wherein the air outlet is disposed directly between the cooling plate and the case in the axial direction.

7. An axial-gap motor-generator comprising:
a case;
a rotor that is accommodated in the case so as to be rotatable around a rotating shaft extending in an axial direction and that includes a magnet;
a stator that is fixed to the case to be accommodated in the case and that includes a coil facing the magnet in the axial direction, the stator having a first distal end and a second distal end opposite to the first distal end in a radial direction substantially perpendicular to the axial direction, the first distal end facing the rotating shaft in the radical direction;
a cooling plate that is in contact with the second distal end, the stator being disposed between the rotating shaft and the cooling plate in the radial direction;
an air inlet provided in the case;
an air outlet provided in the case, a first distance between the air inlet and the rotating shaft in the radial direction being smaller than a second distance between the air outlet and the rotating shaft in the radial direction, the air outlet being formed between the cooling plate and the case in the axial direction;
an airflow generating groove provided between the case and the rotor in the axial direction so as to be connected to the air inlet; and
a radial groove provided between the case and the cooling plate in the axial direction via which the airflow generation groove is connected to the air outlet.

8. The axial-gap motor-generator according to claim 7 ,
wherein the air inlet is opened in the axial direction, and
wherein the air outlet is opened in the radical direction.

9. The axial-gap motor-generator according to claim 7 ,
wherein the stator includes a disc-shaped substrate having an insulator that supports the coil, and
wherein the cooling plate includes a metal or ceramic material having a central opening edge that is in contact with the disc-shaped substrate.

10. The axial-gap motor-generator according to claim 9 ,
wherein the central opening edge covers the second distal end, and
wherein a portion of the coil is disposed at a location where the stator is in contact with the cooling plate.

11. The axial-gap motor-generator according to claim 7 , wherein the airflow generating groove is formed in each of end surfaces of the rotor in the axial direction.

12. The axial-gap motor-generator according to claim 7 ,
wherein the airflow generating groove is formed in an end surface of the rotor that faces the stator, and
wherein an airflow generating rib is formed on an end surface of the rotor that does not face the stator, the airflow generating rib having an extending length in the radial direction.

13. The axial-gap motor-generator according to claim 7 , wherein the rotating shaft is rotatably supported by bearings provided to the case.

14. The axial-gap motor-generator according to claim 7 , wherein the rotor has a substrate on which the magnet is disposed.

15. The axial-gap motor-generator according to claim 14 , wherein the substrate has an opening to which the rotating shaft is fitted.

16. The axial-gap motor-generator according to claim 7 , wherein the stator has stator holes.

17. The axial-gap motor-generator according to claim 7 ,
wherein the air outlet is disposed directly between the cooling plate and the case in the axial direction.

18. An axial-gap motor-generator that operates as a motor or a generator, the axial-gap motor-generator comprising:
a case;
a rotor that is accommodated in and rotatably supported by the case, the rotor including a magnet;
a stator that is accommodated in and fixed to the case, the stator including a coil that faces the magnet in an axial direction of a rotating shaft of the rotor; and
a cooling plate that is disposed on an outer side of the stator in a radial direction,
wherein the case includes an air inlet provided in an inner region in the radial direction and an air outlet provided in an outer region in the radial direction,
wherein the rotor includes an airflow generating groove in an end surface thereof that faces in the axial direction, the airflow generating groove having an extending length in the radial direction,
wherein the cooling plate includes a radial groove in an end surface thereof that faces in the axial direction, the radial groove extending in the radial direction,
wherein the cooling plate is in contact with an outer peripheral edge of the stator, and
wherein the air outlet is an outlet of a flow channel formed by bringing the end surface of the cooling plate in which the radial groove is formed into contact with an inner surface of the case.

19. An axial-gap motor-generator that operates as a motor or a generator, the axial-gap motor-generator comprising:
a case;
a rotor that is accommodated in and rotatably supported by the case, the rotor including a magnet;
a stator that is accommodated in and fixed to the case, the stator including a coil that faces the magnet in an axial direction of a rotating shaft of the rotor; and
a cooling plate that is disposed on an outer side of the stator in a radial direction,
wherein the case includes an air inlet provided in an inn

Assignees

• Honda Motor Co Ltd

Inventors

• Enjoji Naoyuki

Classifications

• H02K1/182

  to stators axially facing the rotor, i.e. with axial or conical air gap · CPC title

• H02K1/32 Primary

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

• H02K1/2793

  Rotors axially facing stators · CPC title

• H02K5/20

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

• H02K21/24

  with magnets axially facing the armatures, e.g. hub-type cycle dynamos · CPC title