Coil assembly, armature and rotating electric machine

Patent metadata

Field	Value
Publication number	US-2024339879-A1
Application number	US-202418748532-A
Country	US
Kind code	A1
Filing date	Jun 20, 2024
Priority date	Dec 20, 2021
Publication date	Oct 10, 2024
Grant date	—

Abstract

A coil assembly includes: a band member formed of an electrically-insulative material into a band shape and rolled along a circumferential direction; and a plurality of coils formed of an electroconductive material on the band member and arranged in alignment with each other along the circumferential direction. The plurality of coils have a plurality of paths through which electric current flows and which constitute parts of a closed circuit. The coil assembly also includes first and second connection portions. The first connection portion constitutes a part of the closed circuit and connects between the plurality of paths. The second connection portion constitutes another part of the closed circuit and connects between the plurality of paths so that induced currents, which are induced in the closed circuit by electromagnetic induction due to movement of magnets in the circumferential direction, are canceled out by each other in the closed circuit.

First claim

What is claimed is:

1 . A coil assembly comprising:
a band member formed of an electrically-insulative material into a band shape and rolled along a circumferential direction; a plurality of coils formed of an electroconductive material on the band member and arranged in alignment with each other along the circumferential direction, the plurality of coils having a plurality of paths through which electric current flows and which constitute parts of a closed circuit; a first connection portion constituting a part of the closed circuit and connecting between the plurality of paths; and a second connection portion constituting another part of the closed circuit and connecting between the plurality of paths or between the plurality of coils so that induced currents, which are induced in the closed circuit by electromagnetic induction due to movement of magnets in the circumferential direction, are canceled out by each other in the closed circuit, wherein: the plurality of paths include a first path and a second path that are arranged side by side in the circumferential direction; each of coil portions of at least some of the plurality of coils is divided into a first part and a second part in a direction intersecting an extending direction of the coil portion; the first parts of the coil portions constitute the first path, and the second parts of the coil portions constitute the second path; and the first path and the second path are connected with each other by the first connection portion and the second connection portion to form the closed circuit.

2 . The coil assembly as set forth in claim 1 , wherein:
each of the plurality of coils has a plurality of turns; and to each of the plurality of turns, there is formed one closed circuit.

3 . The coil assembly as set forth in claim 1 , wherein:
each of the plurality of coils has a plurality of turns; and to each of the plurality of coils, there is formed one closed circuit.

4 . The coil assembly as set forth in claim 1 , wherein
to the plurality of coils, there is formed one closed circuit.

5 . The coil assembly as set forth in claim 1 , wherein:
axial positions of those parts in the paths of the coils where the coils are folded back from a first side to a second side in an axial direction are set to be the same as each other; and axial positions of those parts in the paths of the coils where the coils are folded back from the second side to the first side in the axial direction are set to be the same as each other.

6 . The coil assembly as set forth in claim 5 , wherein:
the number of the coils of a same phase is 2n, where n is a natural number; counting the coils of the same phase in order from one side to the other side in the circumferential direction, the first and second parts of the coil portion at one end of the (2m-1)-th coil are connected with each other via the first connection portion, the first and second parts of the coil portion at one end of the 2m-th coil are connected with each other via the second connection portion, and the first and second parts of the coil portion at the other end of the (2m-1)-th coil are connected respectively with the first and second parts of the coil portion at the other end of the 2m-th coil, where m is a natural number that satisfies m≤ n; and one closed circuit is formed to every two coils of the same phase that are electrically continuous with each other.

7 . The coil assembly as set forth in claim 5 , wherein:
the number of the coils of a same phase is 2n+1, where n is a natural number; counting the coils of the same phase in order from one side to the other side in the circumferential direction, the first and second parts of the coil portion at one end of the (2m-1)-th coil are connected with each other via the first connection portion, the first and second parts of the coil portion at one end of the 2m-th coil are connected with each other via the second connection portion, and the first and second parts of the coil portion at the other end of the (2m-1)-th coil are connected respectively with the first and second parts of the coil portion at the other end of the 2m-th coil, where m is a natural number that satisfies m≤n; for the (2m-1)-th coil to the 2n-th coil, one closed circuit is formed to every two coils of the same phase that are electrically continuous with each other; and one closed circuit is formed to the (2n+1)-th coil of one phase and the (2n+1)-th coil of another phase.

8 . The coil assembly as set forth in claim 1 , wherein:
the band member has a plurality of layers in a radial direction; and the plurality of coils are radially stacked and arranged so that those coils of a given phase which are formed in one layer are offset in the circumferential direction from those coils of the given phase which are formed in another layer.

9 . An armature comprising the coil assembly as set forth in claim 1 .

10 . A rotating electric machine comprising:
a stator, and a rotor, wherein: one the stator and the rotor includes the armature as set forth in claim 9 , and the other of the stator and the rotor has the magnets arranged to radially face the coil assembly.

Assignees

• Denso Corp

Inventors

• Yamamoto Toshio
• Hayashi Yuji

Classifications

• H02K3/47

  Air-gap windings, i.e. iron-free windings · CPC title

• H02K3/04 Primary

  Windings characterised by the conductor shape, form or construction, e.g. with bar conductors · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title