Granted Patent B2

US 12,206,304 · App. 17/801,908 · Granted Jan 21, 2025

Inventors: Shinichi Isobe (Tokyo, JP); Masahiko Ezumi (Tokyo, JP); Mikito Sasaki (Tokyo, JP); Masahiro Nii (Tokyo, JP)

Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.

H02K21/24H02K1/02H02K1/2793H02K3/47

Abstract

Claims (32)

1. An axial-gap coreless rotary electric machine, comprising:

a rotor assembly including a rotary shaft and rotors that are integrated;

stators;

an inner case configured to: (i) house the rotors and the stators; and (ii) rotatably support the rotary shaft; and

an outer case covering a periphery of the inner case,

wherein:

the rotors include field magnets that are fixed to the rotary shaft with intervals in an axial direction;

each of the stators includes armature coils facing at least one of the field magnets;

each of the armature coils includes a first coil segment and a second coil segment facing the first coil segment;

the inner case includes a first case segment and a second case segment facing the first case segment;

the rotor assembly is attached to the first case segment;

the outer case includes an outer introduction port configured to guide a cooling medium to an inside of the outer case;

the inner case includes an inner introduction port configured to introduce the cooling medium to an inside of the inner case;

the inner case includes an inner discharge port configured to discharge the cooling medium to an outside of the inner case; and

the outer case includes an outer discharge port configured to discharge the cooling medium to an outside of the outer case.

2. The axial-gap coreless rotary electric machine according to claim 1 , wherein the first coil segment is a first half of a period of one of the armature coils, and the second coil segment is a second half of the period of the one of the armature coils.

3. The axial-gap coreless rotary electric machine according to claim 1 , wherein the armature coils include a first coil, a second coil, and a third coil different in phase around an axis of the rotary shaft from one another.

4. The axial-gap coreless rotary electric machine according to claim 1 , wherein the first coil segment and the second coil segment are divided in a vertical direction.

5. The axial-gap coreless rotary electric machine according to claim 1 , wherein the first case segment and the second case segment are divided in a vertical direction.

6. A method of manufacturing the axial-gap coreless rotary electric machine according to claim 1 , the method comprising:

preparing the first case segment with the first coil segments of the armature coils disposed at predetermined stator positions;

disposing the rotors at predetermined rotor positions of the first case segment; and

abutting the second case segment to the first case segment.

7. The method according to claim 6 , further comprising adjusting a balance of the rotors between: (i) the disposing of the rotors at the predetermined rotor positions of the first case segment; and (ii) the abutting of the second case segment to the first case segment.

8. The axial-gap coreless rotary electric machine according to claim 1 , wherein the outer introduction port, the inner introduction port, the inner discharge port and the outer discharge port are concentric.

9. The axial-gap coreless rotary electric machine according to claim 1 , wherein:

the outer introduction port is one of a plurality of outer introduction ports positioned along the axial direction;

the inner introduction port is one of a plurality of inner introduction ports positioned along the axial direction;

the inner discharge port is one of a plurality of inner discharge ports positioned along the axial direction; and

the outer discharge port is one of a plurality of outer discharge ports positioned along the axial direction.

10. The axial-gap coreless rotary electric machine according to claim 1 , wherein the cooling medium is a gas.

11. The axial-gap coreless rotary electric machine according to claim 1 , wherein the cooling medium is air.

Assignments (1)

Continuity (1)

References Cited (21)