Axial gap dynamo-electric machine

Patent metadata

Field	Value
Publication number	US-11205935-B2
Application number	US-201716488282-A
Country	US
Kind code	B2
Filing date	Nov 1, 2017
Priority date	Mar 14, 2017
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

The purpose of the present invention is to obtain a structure with which it is possible to improve the heat dissipation performance and efficiency of an axial gap dynamo-electric machine. Accordingly, the present invention is an axial gap dynamo-electric machine of such construction that a disc-shaped rotor in which permanent magnets are disposed is provided in the axial direction and a stator is disposed in the axial-direction center portion, wherein the outer circumferential side of a stator winding is in intimate contact with the inside diameter of a housing, embedding with a mold resin is used for the housing and a stator core and for a stator coil and the housing so that a connection is established with the housing, and the housing comprises a nonmagnetic, electrically nonconductive material.

First claim

The invention claimed is:

1. An axial gap dynamo-electric machine of a structure comprising a disc-shaped rotor where a permanent magnet is disposed in an axial direction and a stator disposed at a middle portion in the axial direction, wherein an outer circumferential side of a stator winding is in intimate contact with an inside diameter of a housing, a stator core and a stator coil are connected to the housing by a resin material, and the housing comprises a nonmagnetic, electrically nonconductive material;
wherein the housing that is nonmagnetic, electrically nonconductive has a cylindrical shape, both axial ends thereof have a cutout in which a bracket having a circular shape can be combined and arranged coaxially, and the cutout cuts an outer side surface of the housing.

2. The axial gap dynamo-electric machine according to claim 1 , wherein the housing comprises any of aluminium oxide, silicon nitride, silicon carbide, aluminium nitride, and zirconium oxide.

3. The axial gap dynamo-electric machine according to claim 2 , wherein the resin material connecting the housing, the stator coil, and the stator core is provided on an inner side surface of the housing.

4. The axial gap dynamo-electric machine according to claim 3 , wherein the resin material has an angle in the axial direction and varies in thickness.

5. The axial gap dynamo-electric machine according to claim 1 , wherein the housing that is nonmagnetic, electrically nonconductive has a cylindrical shape, and an inner side surface and an outer side surface are in a surface state where cutting is not carried out after firing and molding.

6. The axial gap dynamo-electric machine according to claim 1 , wherein after the stator coil is wound, winding bulge is deformed in a coil state such that a shape of a coil end portion that becomes an outer circumferential side has a shape that fits an inside diameter of the housing.

7. The axial gap dynamo-electric machine according to claim 1 , comprising a means of sandwiching the stator with end brackets arranged at both ends in the axial direction, wherein the sandwiching means has a structure in which a long shaft that is externally threaded at both ends is inserted through the brackets, an end portion of the external thread is tightened with a nut such that the stator is held by sandwiching friction between the housing and the end brackets.

8. The axial gap dynamo-electric machine according to claim 1 , further comprising end brackets and a plurality of stepped long shafts arranged around an outer surface of the housing which are configured to sandwich the stator of an axial gap motor in which the housing is formed of a ceramic member, with the end brackets arranged at both axial ends, wherein each of the stepped long shafts has a parallel portion identical to an axial length of the housing, is externally threaded at both ends, is inserted through brackets, and an end of the external thread is tightened with a nut such that the stator is held by sandwiching friction between a parallel surface of the stepped long shaft, an end surface of the housing, and the end brackets.

9. The axial gap dynamo-electric machine according to claim 7 , wherein the housing is formed of ceramic material, and the housing has a cylindrical shape, deadweight of a motor is supported at a part of end brackets at both ends and a hole for attaching to a floor surface is arranged.

10. An axial gap dynamo-electric machine comprising:
a disc-shaped rotor where a permanent magnet is disposed in an axial direction;
a stator disposed at a middle portion in the axial direction, wherein an outer circumferential side of a stator winding is in intimate contact with an inside diameter of a housing, a stator core and a stator coil are connected to the housing by a resin material, and the housing comprises a nonmagnetic, electrically nonconductive material;
end brackets; and
a plurality of stepped long shafts arranged around an outer surface of the housing which are configured to sandwich the stator of an axial gap motor in which the housing is formed of a ceramic member, with the end brackets arranged at both axial ends, wherein each of the stepped long shafts has a parallel portion identical to an axial length of the housing, is externally threaded at both ends, is inserted through brackets, and an end of the external thread is tightened with a nut such that the stator is held by sandwiching friction between a parallel surface of the stepped long shaft, an end surface of the housing, and the end brackets.

Assignees

• Hitachi Ltd

Inventors

• Enomoto Yuji
• Tokoi Hirooki
• Deguchi Kenta

Classifications

• H02K5/08 Primary

  Insulating casings · CPC title

• H02K2205/12

  Machines characterised by means for reducing windage losses or windage noise · CPC title

• H02K21/24

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

• H02K5/02

  Casings or enclosures characterised by the material thereof · CPC title

• H02K3/345

  between conductor and core, e.g. slot insulation · CPC title