Coil assembly for electrical rotating machine, stator for electrical rotating machine, and electrical rotating machine

• US 20090195106A1
• Filed: 01/30/2009
• Published: 08/06/2009
• Est. Priority Date: 01/31/2008
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Murakami, Hisashi, Ozawa, Masaru, Iki, Tomotaka
• Granted Patent: US 8,115,361 B2
• Time in Patent Office: Days
• US Class Current: 310/208
• CPC Class Codes: H02K 3/26 consisting of printed conductors
• CPC Class Codes: H02K 3/47 Air-gap windings, i.e. iron-free windings

Abstract

The torque characteristic is improved using a magnetic flux efficiently, and an eddy-current loss generated in a coil is reduced. Moreover, a loss is suppressed even if a metal member having a high thermal conductivity is closely disposed or closely contacted to a coil surface exposed by a variable magnetic field to improve the heat transfer property, thereby improving the cooling capability. A coil assembly for a rotational electric apparatus has first and second coil plates having wiring patterns formed in such a way that conductive coil segments adjoin with each other via slits, magnetic-flux-transfer-member slots formed in the slits and having a wider width than such slits, a coil constituted by the stacked coil plates so that the magnetic-flux-transfer-member slots overlap with each other, and a magnetic flux transfer member inserted into the magnetic-flux-transfer-member slots of the coil.

Claims

1. A coil assembly for a stator of an electrical rotating machine comprising:

first and second coil plates each including coil segments, one coil segment adjoining another coil segment through a slit comprising a slot, the first and second coil plates being laminated so that the slots thereof overlap with each other, the first and second coil plates being mechanically and electrically connected so as to have a coil; and

magnetic transfer members in the slots configured to transfer magnetic flux.

2. The coil assembly as claimed in claim 1, wherein at least one of the first and second coil plates comprises a plurality of coil plate base members which are laminated, each of the coil plate base members are formed by etching.

3. The coil assembly as claimed in claim 1, wherein the first and second coil plates are mechanically and electrically connected through a diffusion bonding portion.

4. The coil assembly as claimed in claim 1, wherein the magnetic transfer members in the slots protrude from the coil segments.

5. A stator comprising the coil assembly as claimed in claim 1, further comprising a heat transfer member covering at least one of the first and second coil plates.

6. The stator as claimed in claim 5, wherein the heat transfer member includes induced-current-cutoff slits, and the magnetic transfer members protrude from the heat transfer member through the induced-current-cutoff slits.

7. The stator as claimed in claim 6, wherein the induced-current-cutoff slits are disposed at such positions as to cut off induced currents generated in the heat transfer member.

8. The stator as claimed in claim 5, wherein the heat transfer member includes a lower magnetic permeability than the magnetic flux transfer member.

9. The stator as claimed in claim 5, further comprising a coolant passage that allows a coolant to flow therethrough and is thermally coupled to the heat transfer member to conduct heat generated by the coil to the coolant.

10. The stator as claimed in claim 5, wherein the heat transfer member closely contacts the surface of the coil via an insulator;

and

the insulator comprises an insulation sheet and a heat transfer sheet which more transfers heat in one direction than other directions, and is so disposed as to transfer heat generated by the coil in the direction of the coolant passage.

11. The stator as claimed in claim 5, wherein the heat transfer member comprises an electrical conductive material.

12. An electrical rotating machine comprising the coil assembly as claimed in claim 1, further comprising:

two rotors each including a plurality of pairs of magnets, each pair of magnets facing each other with opposite magnetic polarity through the coil.

13. An electrical rotating machine comprising the stator as claimed in claim 5, further comprising:

two rotors each including a plurality of pairs of magnets, each pair of magnets facing each other with opposite magnetic polarity through the coil.

14. The coil assembly as claimed in claim 1, wherein the slot has a width greater than a width of slit.