Coil body, armature and rotating electric machine

Abstract

To improve torque while suppressing increase in body size.SOLUTION: A coil body 32 comprises a band member wound in a circumferential direction being formed in belt shape by using an insulative material, and a plurality of coils 16 arranged in a state of being formed on the belt member by using the insulative material, and being arranged side-by-side along a circumferential direction. The plurality of coils 16 comprising a plurality of passages each into which current flows comprises a closed circuit 66 including the plurality of passages. Further, the coil body 32 comprises a first wire connection part 62 and a second wire connection part 64. The first wire connection part 62 constituting part of the closed circuit 66 is wired among the plurality of passages. The second wire connection part 64 constituting the other part of the closed circuit 66 is wired among the plurality of passages in such a manner that current flowing into the closed circuit 66 caused by electromagnetic induction resulting from moving a magnet 18 in a circumferential direction is canceled inside the closed circuit 66.SELECTED DRAWING: Figure 23

Description

[Technical Field]

[0001] The present disclosure relates to a coil body, an armature, and a rotating electric machine. [Background technology]

[0002] Patent Document 1 below discloses a coil body constituting part of the armature of a rotating electric machine. The coil body described in this document includes a first conductive cylinder, a second conductive cylinder, and an electrical insulator arranged between the first and second conductive cylinders. The first conductive cylinder of the coil body includes a plurality of first conductive bands extending in the axial direction of the cylinder and arranged adjacent to each other at intervals in the circumferential direction. The second conductive cylinder includes a plurality of second conductive bands extending in the axial direction of the cylinder and arranged adjacent to each other at intervals in the circumferential direction. The first conductive bands and the second conductive bands are electrically insulated from each other by the electrical insulator. This configuration prevents impairment of the electrical performance of the coil body while simplifying the configuration of the coil body and reducing costs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-070140 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, it is desirable for a motor having a coil body as in the above-mentioned patent document to have improved torque while suppressing an increase in size.

[0005] In consideration of the above, an object of the present disclosure is to provide a coil body, an armature, and a rotating electric machine that can improve torque while suppressing an increase in size. [Means for solving the problem]

[0006] A coil body (32) that solves the above problem includes a band member (34) formed in a band shape using an insulating material and wound in a circumferential direction, a plurality of coils (16) formed on the band member using a conductive material and arranged side by side along the circumferential direction, the plurality of coils (16) having a plurality of paths through which current flows and forming part of a closed circuit (66), a first connection (62) that forms part of the closed circuit and connects the plurality of paths, and a second connection (64) that forms another part of the closed circuit and connects the plurality of paths or the plurality of coils so that current flowing in the closed circuit due to electromagnetic induction caused by circumferential movement of a magnet is canceled within the closed circuit. An armature (14) is configured including this coil body. A rotating electric machine (10, 68, 72, 82, 84) includes one of a stator (14) and a rotor (12) that include this armature, and the other of a stator and a rotor that has a magnet (18) arranged radially opposite the coil body.

[0007] By configuring it in this way, it is possible to improve torque while suppressing an increase in the size of the motor. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a cross section of a motor according to a first embodiment taken along an axial direction. [Figure 2] 1 is a cross-sectional view showing a cross section of a motor according to a first embodiment taken along a radial direction. [Figure 3] FIG. 2 is a perspective view schematically showing a coil body. [Figure 4] FIG. 2 is a perspective view schematically showing the band member in a wound state. [Figure 5] FIG. 1 is a diagram illustrating a star connection. [Figure 6] FIG. 2 is a diagram showing connections of multiple coils. [Figure 7] FIG. 2 is a diagram schematically illustrating a coil. [Figure 8]FIG. 10 is a schematic diagram in which some coils constituting a U-phase are offset from other coils in the axial direction. [Figure 9] FIG. 10 is a diagram showing an expanded coil body. [Figure 10] FIG. 3 is a cross-sectional view showing a part of the coil body. [Figure 11] FIG. 3 is a cross-sectional view showing a part of the coil body. [Figure 12] FIG. 3 is a cross-sectional view showing a part of the coil body. [Figure 13] FIG. 3 is a cross-sectional view showing a cross section of the coil body cut along the radial direction. [Figure 14] FIG. 2 is a cross-sectional view showing a vertical section laminate. [Figure 15] FIG. 2 is a cross-sectional view showing a vertical section laminate. [Figure 16] FIG. 2 is a cross-sectional view showing a vertical section laminate. [Figure 17] FIG. 2 is a diagram schematically illustrating some coils of the motor of the first embodiment. [Figure 18] FIG. 4 is an enlarged view of the other axial end of the coil. [Figure 19] FIG. 1 is a diagram showing a schematic diagram of an induced current generated in a coil when a magnet with an N pole passes by. [Figure 20] This is a diagram showing a schematic diagram of an induced current generated in a closed circuit when a north pole magnet passes. [Figure 21] This is a diagram showing the induced current generated in the coil when the south pole magnet passes. [Figure 22] This is a diagram showing a schematic diagram of the induced current generated in a closed circuit when a south pole magnet passes. [Figure 23] 10A and 10B are diagrams illustrating a manner in which an induced current generated in a coil is canceled out. [Figure 24] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 25] 10 is a graph showing each induced current and a combined current. [Figure 26] FIG. 10 is a diagram schematically illustrating some coils of a motor according to a second embodiment. [Figure 27]10A and 10B are diagrams illustrating a manner in which an induced current generated in a coil is canceled out. [Figure 28] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 29] FIG. 10 is a diagram schematically illustrating some coils of a motor according to a third embodiment. [Figure 30] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 31] FIG. 10 is a diagram schematically illustrating some coils of a motor according to a fourth embodiment. [Figure 32] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 33] FIG. 10 is a diagram schematically illustrating some coils of a motor according to a fifth embodiment. [Figure 34] 10A and 10B are diagrams illustrating a manner in which an induced current generated in a coil is canceled out. [Figure 35] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 36] FIG. 10 is a diagram schematically illustrating a coil of a motor according to a sixth embodiment. [Figure 37] FIG. 13 is a diagram schematically illustrating some coils of a motor according to a sixth embodiment. [Figure 38] FIG. 13 is a diagram schematically showing connections at the neutral points of some coils of a motor according to a sixth embodiment. [Figure 39] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 40] FIG. 13 is a diagram schematically illustrating some coils of a motor according to a seventh embodiment. [Figure 41] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 42] FIG. 13 is a diagram schematically illustrating some coils of a motor according to an eighth embodiment. [Figure 43] 10A and 10B are diagrams illustrating a manner in which an induced current generated in a coil is canceled out. [Figure 44]FIG. 13 is a diagram schematically illustrating some coils of a motor according to a ninth embodiment. [Figure 45] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 46] FIG. 23 is a diagram schematically illustrating a cross section of a coil body of a motor according to a tenth embodiment. [Figure 47] FIG. 23 is a diagram schematically illustrating some coils of a motor according to a tenth embodiment. [Figure 48] FIG. 10 is a diagram illustrating a manner in which an induced current occurring in a closed circuit is canceled. [Figure 49] FIG. 22 is a diagram schematically showing a coil of a motor according to an eleventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A motor 10 according to a first embodiment of the present disclosure will be described using Figures 1 to 25. Note that the arrow Z direction, arrow R direction, and arrow C direction shown as appropriate in the figures respectively indicate one side in the rotational axis direction, the outer side in the rotational radial direction, and one side in the rotational circumferential direction of a rotor 12, which will be described later. Furthermore, hereinafter, when simply referring to an axial direction, a radial direction, or a circumferential direction, this refers to the rotational axis direction, rotational radial direction, or rotational circumferential direction of the rotor 12, unless otherwise specified. Furthermore, the motor 10 of this embodiment and the motors of each embodiment described later are examples of rotating electric machines.

[0010] 1 and 2, the motor 10 of this embodiment is an inner rotor type brushless motor in which a rotor 12 as a rotor is disposed radially inside a stator 14 as an armature and a stator. Note that the drawings shown in Figures 1 and 2 are drawings of the motor 10 etc. shown as an example, and there are some parts that do not match the numbers of coils 16, the numbers of magnets 18, and the shapes of the details that will be described later.

[0011] The rotor 12 is composed of a rotating shaft 22 rotatably supported via a pair of bearings 20, a rotor core 24 formed in a bolt-like cylindrical shape and fixed to the rotating shaft 22, and a plurality of magnets 18 fixed to the radially outer surface of the rotor core 24.

[0012] The rotor core 24 includes a first cylindrical portion 24A to which the rotating shaft 22 is fixed by press-fitting or the like, a second cylindrical portion 24B disposed radially outward of the first cylindrical portion 24A and also formed cylindrical, and a disc-shaped connecting plate portion 24C that radially connects one axial end of the first cylindrical portion 24A to one axial end of the second cylindrical portion 24B. The outer peripheral surface, which is the radially outer surface of the second cylindrical portion 24B, is formed cylindrically along the circumferential direction. A magnet 18, which will be described later, is fixed to the outer peripheral surface of the second cylindrical portion 24B.

[0013] The magnets 18 are formed using a magnetic compound having an intrinsic coercivity Hc of 400 kA / m or more and a residual magnetic flux density Br of 1.0 T or more. As an example, the magnets 18 of this embodiment are made of NdFe 11 TiN, Nd2Fe 14 B, SmFe 17 The rotor core 24 is formed using a magnetic compound such as N3 or FeNi. A plurality of magnets 18 are fixed to the outer peripheral surface of the second cylindrical portion 24B of the rotor core 24. The magnets 18 whose radially outer surfaces are N poles and the magnets 18 whose radially outer surfaces are S poles are arranged alternately in the circumferential direction. The number of magnets 18 may be set appropriately taking into consideration the output required of the motor 10, etc.

[0014] Stator 14 includes stator core 26 as an armature core formed in an annular shape, insulator 28 attached to stator core 26 by adhesive bonding, fitting, or the like, and coil body 32 attached to stator core 26 via insulator 28. As shown in Figures 1 to 3, stator 14 of this embodiment has a teethless structure in which a portion of stator core 26 is not disposed inside coil 16 that constitutes a portion of coil body 32.

[0015] 1 and 2, the stator core 26 is formed in an annular shape using a soft magnetic material such as steel. The stator core 26 is disposed coaxially with the rotor 12, and the axial center position of the stator core 26 and the axial center position of the multiple magnets 18 fixed to the rotor core 24 coincide with each other in the axial direction.

[0016] 1, the insulator 28 is formed using, for example, resin, which is an insulating material. The insulator 28 covers the radially inner surface of the stator core 26 when the insulator 28 is attached to the stator core 26. Note that the insulator 28 is not shown in FIG. 2.

[0017] As shown in FIG. 3, the coil body 32 of this embodiment is configured to include a band member 34 formed in a band shape using an insulating material, and a plurality of coils 16 formed on the band member 34.

[0018] As shown in FIG. 4 , the band member 34 is formed in a rectangular shape with its short side oriented in the axial direction and its long side oriented in a direction perpendicular to the axial direction. The thickness of the band member 34 is set to a thickness that allows the band member 34 to be curved in the circumferential direction. In this embodiment, a single band member 34 is wound multiple times in the circumferential direction to form a cylindrical shape. Note that in this embodiment, most of the band member 34 has four layers in the radial direction. The coil body 32 may also be formed from multiple band members 34 wound in an annular shape. For example, the coil body 32 may be formed from four band members 34, and the inner and outer diameters of the four band members 34 may be different from one another. Then, one band member 34 may be disposed radially inside the other band members 34 to form a coil body 32 having four layers in the radial direction.

[0019] As shown in Fig. 3, the multiple coils 16 are formed on a band member 34. Then, as shown in Fig. 3 and Fig. 4, the band member 34 is wound multiple times in the circumferential direction, so that the multiple coils 16 are arranged at predetermined positions in the circumferential and radial directions.

[0020] In this embodiment, the plurality of coils 16 constituting the U phase (U-phase coil group 42U), the plurality of coils 16 constituting the V phase (V-phase coil group 42V), and the plurality of coils 16 constituting the W phase (W-phase coil group 42W) are star-connected, as shown in Fig. 5. Specifically, the 24 coils 16 constituting the U-phase coil group 42U, the 24 coils 16 constituting the V-phase coil group 42V, and the 24 coils 16 constituting the W-phase coil group 42W are star-connected, as shown in Fig. 6.

[0021] Here, the 24 coils 16 constituting the U-phase coil group 42U will be numbered U11, U12, U13, U21, U22, U23, U31, U32, U33, U41, U42, U43, U51, U52, U53, U61, U62, U63, U71, U72, U73, U81, U82, and U83, respectively.

[0022] Furthermore, the 24 coils 16 constituting the V-phase coil group 42V will be numbered V11, V12, V13, V21, V22, V23, V31, V32, V33, V41, V42, V43, V51, V52, V53, V61, V62, V63, V71, V72, V73, V81, V82, and V83, respectively.

[0023] Furthermore, the 24 coils 16 constituting the W-phase coil group 42W will be numbered W11, W12, W13, W21, W22, W23, W31, W32, W33, W41, W42, W43, W51, W52, W53, W61, W62, W63, W71, W72, W73, W81, W82, and W83, respectively.

[0024] In the following description, a specific coil 16 may be indicated only by its coil number.

[0025] U11, U12, and U13 are connected in series. U21, U22, and U23 are connected in series. U31, U32, and U33 are connected in series. U41, U42, and U43 are connected in series. U51, U52, and U53 are connected in series. U61, U62, and U63 are connected in series. U71, U72, and U73 are connected in series. U81, U82, and U83 are connected in series.

[0026] In addition, the end of U11 opposite to the side connected to U12, the end of U21 opposite to the side connected to U22, the end of U31 opposite to the side connected to U32, the end of U41 opposite to the side connected to U42, the end of U51 opposite to the side connected to U52, the end of U61 opposite to the side connected to U62, the end of U71 opposite to the side connected to U72, and the end of U81 opposite to the side connected to U82 are all connected to each other.

[0027] V11, V12, and V13 are connected in series. V21, V22, and V23 are connected in series. V31, V32, and V33 are connected in series. V41, V42, and V43 are connected in series. V51, V52, and V53 are connected in series. V61, V62, and V63 are connected in series. V71, V72, and V73 are connected in series. V81, V82, and V83 are connected in series.

[0028] In addition, the end of V11 opposite to the side connected to V12, the end of V21 opposite to the side connected to V22, the end of V31 opposite to the side connected to V32, the end of V41 opposite to the side connected to V42, the end of V51 opposite to the side connected to V52, the end of V61 opposite to the side connected to V62, the end of V71 opposite to the side connected to V72, and the end of V81 opposite to the side connected to V82 are all connected to one another.

[0029] W11, W12, and W13 are connected in series. W21, W22, and W23 are connected in series. W31, W32, and W33 are connected in series. W41, W42, and W43 are connected in series. W51, W52, and W53 are connected in series. W61, W62, and W63 are connected in series. W71, W72, and W73 are connected in series. W81, W82, and W83 are connected in series.

[0030] In addition, the end of W11 opposite to the side connected to W12, the end of W21 opposite to the side connected to W22, the end of W31 opposite to the side connected to W32, the end of W41 opposite to the side connected to W42, the end of W51 opposite to the side connected to W52, the end of W61 opposite to the side connected to W62, the end of W71 opposite to the side connected to W72, and the end of W81 opposite to the side connected to W82 are all wired together.

[0031] The end of U13 opposite to the end connected to U12, the end of V13 opposite to the end connected to V12, and the end of W13 opposite to the end connected to W12 are connected to each other.

[0032] The end of U23 opposite to the end connected to U22, the end of V23 opposite to the end connected to V22, and the end of W23 opposite to the end connected to W22 are all connected to one another.

[0033] The end of U33 opposite to the end connected to U32, the end of V33 opposite to the end connected to V32, and the end of W33 opposite to the end connected to W32 are connected to each other.

[0034] The end of U43 opposite to the end connected to U42, the end of V43 opposite to the end connected to V42, and the end of W43 opposite to the end connected to W42 are connected to each other.

[0035] The end of U53 opposite to the end connected to U52, the end of V53 opposite to the end connected to V52, and the end of W53 opposite to the end connected to W52 are connected to each other.

[0036] The end of U63 opposite to the end connected to U62, the end of V63 opposite to the end connected to V62, and the end of W63 opposite to the end connected to W62 are connected to each other.

[0037] The end of U73 opposite to the end connected to U72, the end of V73 opposite to the end connected to V72, and the end of W73 opposite to the end connected to W72 are all connected to one another.

[0038] The end of U83 opposite to the end connected to U82, the end of V83 opposite to the end connected to V82, and the end of W83 opposite to the end connected to W82 are connected to each other.

[0039] 7 schematically shows a plurality of U-phase coils 16. Each coil 16 is formed in a hexagonal shape when viewed from the thickness direction of the band member 34. Each coil 16 has the same configuration as a three-turn coil in which a conducting wire is wound three times.

[0040] The portion of the coil U11 constituting the first turn includes a first straight portion A1 that slopes toward the other circumferential side as it extends toward the other axial side, a second straight portion A2 that extends from the first straight portion A1 toward the other axial side, and a third straight portion A3 that slopes toward one circumferential side as it extends from the second straight portion A2 toward the other axial side. The portion of the coil U11 constituting the first turn also includes a fourth straight portion A4 that slopes toward one circumferential side as it extends from the third straight portion A3 toward the one axial side, a fifth straight portion A5 that extends from the fourth straight portion A4 toward the one axial side, and a sixth straight portion A6 that slopes toward the other circumferential side as it extends from the fifth straight portion A5 toward the one axial side. The first straight portion A1, the second straight portion A2, and the third straight portion A3 are formed on one surface 34A of the band member 34 (see FIG. 10). The fourth straight portion A4, the fifth straight portion A5, and the sixth straight portion A6 are formed on the other surface 34B (see FIG. 10) of the band member 34. Here, the third straight portion A3 and the fourth straight portion A4 are electrically connected via vias, through-holes, etc. (not shown) that penetrate the band member 34. Note that the portion of the coil U11 formed on one surface 34A of the band member 34 is indicated by a solid line. Also, the portion of the coil U11 formed on the other surface 34B of the band member 34 is indicated by a dashed line.

[0041] The portion of the coil U11 constituting the second turn includes a first straight portion B1 that slopes toward the other circumferential side as it extends from the sixth straight portion A6 of the first turn toward the other axial side, a second straight portion B2 that extends from the first straight portion B1 toward the other axial side, and a third straight portion B3 that slopes toward one circumferential side as it extends from the second straight portion B2 toward the other axial side. The portion of the coil U11 constituting the second turn also includes a fourth straight portion B4 that slopes toward one circumferential side as it extends from the third straight portion B3 toward the one axial side, a fifth straight portion B5 that extends from the fourth straight portion B4 toward the one axial side, and a sixth straight portion B6 that slopes toward the other circumferential side as it extends from the fifth straight portion B5 toward the one axial side. The sixth straight portion A6 and the first straight portion B1 are electrically connected via a via, a through-hole, or the like (not shown) that penetrates the band member 34. The third straight portion B3 and the fourth straight portion B4 are electrically connected to each other via a via hole or a through hole (not shown) that penetrates the band member .

[0042] The portion of the coil U11 constituting the third turn includes a first straight portion C1 that slopes toward the other circumferential side as it extends from the sixth straight portion B6 of the second turn toward the other axial side, a second straight portion C2 that extends from the first straight portion C1 toward the other axial side, and a third straight portion C3 that slopes toward one circumferential side as it extends from the second straight portion C2 toward the other axial side. The portion of the coil U11 constituting the third turn also includes a fourth straight portion C4 that slopes toward one circumferential side as it extends from the third straight portion C3 toward the one axial side, a fifth straight portion C5 that extends from the fourth straight portion C4 toward the one axial side, and a sixth straight portion C6 that slopes toward the other circumferential side as it extends from the fifth straight portion C5 toward the one axial side. The sixth straight portion B6 and the first straight portion C1 are electrically connected via a via, a through-hole, or the like (not shown) that penetrates the band member 34. The third straight portion C3 and the fourth straight portion C4 are electrically connected to each other via a via hole or a through hole (not shown) that penetrates the band member .

[0043] Furthermore, the portion of the coil U11 that forms the second turn (first straight portion B1 to sixth straight portion B6) is offset to one side in the circumferential direction from the portion of the coil U11 that forms the first turn (first straight portion A1 to sixth straight portion A6). Furthermore, the portion of the coil U11 that forms the third turn (first straight portion C1 to sixth straight portion C6) is offset to one side in the circumferential direction from the portion of the coil U11 that forms the second turn (first straight portion B1 to sixth straight portion B6).

[0044] 7 and 8, the other coils (U12 to U83) constituting the U phase are configured similarly to coil U11. That is, all of the coils (U11 to U83) constituting the U phase have the same configuration. The second straight sections A2, B2, C2 and fifth straight sections A5, B5, C5 described above may be referred to as vertical sections 36. The first straight sections A1, B1, C1 and sixth straight sections A6, B6, C6 may be referred to as one coil end section 38, and the third straight sections A3, B3, C3 and fourth straight sections A4, B4, C4 may be referred to as the other coil end section 38.

[0045] FIG. 8 is a schematic diagram showing some coils U11 and the like that make up the U phase and other coils U12 and the like that are offset in the axial direction.

[0046] 8 and 7, the fifth straight portion A5, the fifth straight portion B5, and the fifth straight portion C5 of the coil U11 are arranged at the same circumferential positions as the second straight portion A2, the second straight portion B2, and the second straight portion C2 of the coil U12, respectively. That is, the fifth straight portion A5, the fifth straight portion B5, and the fifth straight portion C5 of the coil U11 overlap with the second straight portion A2, the second straight portion B2, and the second straight portion C2 of the coil U12 with the band member 34 interposed therebetween.

[0047] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U12 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U13, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U12 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U13 with the band member 34 interposed therebetween.

[0048] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U13 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U23, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U13 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U23 with the band member 34 interposed therebetween.

[0049] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U23 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U22, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U23 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U22 with the band member 34 interposed therebetween.

[0050] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U22 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U21, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U22 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U21 with the band member 34 interposed therebetween.

[0051] The coils U11, U12, U13, U23, U22, and U21 described above are arranged in this order on the first turn of the wound band member 34. That is, U11, U12, U13, U23, U22, and U21 are arranged in this order on the side of the wound band member 34 closest to the rotor 12.

[0052] Furthermore, the sixth straight portion C6 of the coil U11 is connected to the sixth straight portion C6 of the coil U12. Furthermore, the first straight portion A1 of the coil U12 is connected to the first straight portion A1 of the coil U13. Furthermore, the sixth straight portion C6 of the coil U23 is connected to the sixth straight portion C6 of the coil U22. Furthermore, the first straight portion A1 of the coil U22 is connected to the first straight portion A1 of the coil U21. As a result, in this embodiment, although the physical configuration of the coils U11, U12, U13, U23, U22, and U21 is a coil wound in one direction (a left-handed coil, which will be described later), when current is applied to the coils U11, U12, U13, U23, U22, and U21, the coils U12, U23, and U21 function in the same manner as a coil wound in the opposite direction to the coils U11, U13, and U22 (a right-handed coil). For convenience of explanation, the coils corresponding to coils U11, U13, and U22 will be referred to as "left-handed coils," and the coils corresponding to coils U12, U23, and U21 will be referred to as "right-handed coils." In FIG. 8, the symbols for coils U12, U23, and U21, which are right-handed coils, are indicated by lines (bars). In this embodiment, the left-handed coils and right-handed coils are arranged alternately in the circumferential direction.

[0053] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U31 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U32, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U31 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U32 with the band member 34 interposed therebetween.

[0054] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U32 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U33, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U32 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U33 with the band member 34 interposed therebetween.

[0055] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U33 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U43, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U33 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U43 with the band member 34 interposed therebetween.

[0056] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U43 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U42, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U43 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U42 with the band member 34 interposed therebetween.

[0057] Furthermore, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U42 are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U41, respectively. That is, the fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U42 overlap with the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U41 with the band member 34 interposed therebetween.

[0058] The coils U31, U32, U33, U43, U42, and U41 described above are arranged in this order on the second turn of the wound band member 34. The fifth straight portion A5, fifth straight portion B5, and fifth straight portion C5 of the coil U21 arranged on the first turn are arranged at the same circumferential positions as the second straight portion A2, second straight portion B2, and second straight portion C2 of the coil U31 arranged on the second turn, respectively.

[0059] Furthermore, the coils U31, U32, U33, U43, U42, and U41 arranged on the second turn of the band member 34 are connected in the same manner as the coils U11, U12, U13, U23, U22, and U21 arranged on the first turn of the band member 34.

[0060] The coils U51 to U83 are also arranged on the band member 34 in the same relationship as the coils U11 to U43 described above. As a result, the coils U51, U52, U53, U63, U62, and U61 are arranged in this order on the third turn of the wound band member 34. The coils U71, U72, U73, U83, U72, and U81 are arranged in this order on the fourth turn of the wound band member 34.

[0061] Furthermore, the coils U51, U52, U53, U63, U62, and U61 arranged in the third turn of the band member 34 are connected in the same relationship as the coils U11, U12, U13, U23, U22, and U21 arranged in the first turn of the band member 34. Furthermore, the coils U71, U72, U73, U83, U82, and U81 arranged in the fourth turn of the band member 34 are connected in the same relationship as the coils U11, U12, U13, U23, U22, and U21 arranged in the first turn of the band member 34.

[0062] 8 and 9, the coils V11 to V83 constituting the V phase are arranged on the band member 34 in the same relationship as the coils U11 to U83 constituting the U phase. Furthermore, the coils W11 to W83 constituting the W phase are arranged on the band member 34 in the same relationship as the coils U11 to U83 constituting the U phase. However, the coils V11 to V83 constituting the V phase are connected so that their winding direction is opposite to that of the coils constituting the U and W phases.

[0063] Additionally, the coils V11 to V83 that make up the V phase are offset to one side in the circumferential direction relative to the coils U11 to U83 that make up the U phase. Furthermore, the coils W11 to W83 that make up the W phase are offset to one side in the circumferential direction relative to the coils V11 to V83 that make up the V phase.

[0064] FIG. 10 shows a portion of a cross section of the band member 34 and the multiple coils 16 taken along line AA in FIG. 9. The cross section shown in FIG. 10 is a cross section of the other circumferential end of the band member 34. As shown in FIG. 10, in this portion, U11T1, U11T2, U11T3, V11T3, V11T2, V11T1, W11T1, W11T2, and W11T3 are formed in this order on one surface 34A of the band member 34. Note that the reference numerals indicating the coils are suffixed with a reference numeral T1 indicating the first turn, a reference numeral T2 indicating the second turn, and a reference numeral T3 indicating the third turn. For example, the portion indicating the first turn of the coil U11 is suffixed with a reference numeral U11T1, the portion indicating the second turn of the coil U11 is suffixed with a reference numeral U11T2, and the portion indicating the third turn of the coil U11 is suffixed with a reference numeral U11T3.

[0065] 11 shows a portion of a cross section of the band member 34 and the plurality of coils 16 taken along line AA in FIG. 9. The cross section shown in FIG. 11 corresponds to the range indicated by arrow E in FIG. 9. The cross section shown in FIG. 11 is a cross section of a portion adjacent in the circumferential direction to the cross section shown in FIG. 10. In the cross section shown in FIG. 11, U12T3, U12T2, U12T1, V12T1, V12T2, V12T3, W12T3, W12T2, and W12T1 are formed in this order on one surface 34A of the band member 34. In the cross section shown in FIG. 11, U11T1, U11T2, U11T3, V11T3, V11T2, V11T1, W11T1, W11T2, and W11T3 are formed in this order on the other surface 34B of the band member 34.

[0066] Although not shown, even on one circumferential side of the cross section shown in Figure 11, the U-phase coils (U12, U13, U23...U83, U82, U81), the V-phase coils (V12, V13, V23...V83, V82, V81), and the W-phase coils (W12, W13, W23...W83, W82, W81) are formed on one surface 34A and the other surface 34B of the band member 34 in the same relationship as that shown in Figure 11.

[0067] 12 shows a portion of a cross section of the band member 34 and the plurality of coils 16 taken along line AA shown in Fig. 9. The cross section shown in Fig. 12 is a cross section of an end portion on one circumferential side of the band member 34. As shown in Fig. 12, in this portion, U81T1, U81T2, U81T3, V81T3, V81T2, V81T1, W81T1, W81T2, and W81T3 are formed in this order on the surface 34B on the other side of the band member 34.

[0068] As shown in FIG. 9, each coil 16 is connected via a connection pattern 40 provided on one axial side of the belt member 34. The portion of the connection pattern 40 formed on one surface 34A of the belt member 34 is indicated by a solid line. The portion of the connection pattern 40 formed on the other surface 34B of the belt member 34 is indicated by a dashed line. The connection pattern 40 indicated by reference numeral 44 represents a neutral point. The connection pattern 40 indicated by reference numeral 43 represents a connection portion connected to a control unit (not shown). The connections between the coils 16 and the connections (40, 43, 44) connected to the control unit may be made using separate bus bars or printed circuit boards.

[0069] As described above, the band member 34 is wound multiple times in the circumferential direction, thereby disposing the multiple coils 16 at predetermined positions in the circumferential and radial directions. Fig. 13 shows a portion of a cross section taken along the radial direction of the coil body 32 around which the band member 34 is wound. Note that this cross section is a cross section of a portion corresponding to the vertical portion 36 of each coil 16 (see Fig. 7).

[0070] In the cross section shown in FIG. 13 , the vertical portions 36 of the multiple coils 16 are stacked radially and arranged at equal intervals in the circumferential direction. When the vertical portions 36 of the multiple coils 16 are stacked radially, a first insulating layer 54A or a second insulating layer 54B is interposed between a pair of radially adjacent vertical portions 36. The first insulating layer 54A is the band member 34. The second insulating layer 54B is an insulating film, such as an insulating paint, formed to cover the coils 16 formed on the band member 34. Here, the vertical portions 36 of the multiple coils 16 stacked radially are referred to as a vertical portion laminate 56. When viewed in a cross section cut along the radial direction, this vertical portion laminate 56 has a rectangular cross section in which the radial dimension R1 is larger than the circumferential dimension S1. In this embodiment, the circumferential dimension S2 of the vertical portions 36 constituting the vertical portion laminate 56 is larger than the radial dimension R2.

[0071] Here, Figures 14, 15 and 16 show a vertical section laminate 56 whose radially inner end is U12T3, a vertical section laminate 56 whose radially inner end is U12T2, and a vertical section laminate 56 whose radially inner end is U12T1, respectively.

[0072] As shown in Figure 14, in the vertical section stack 56 whose radially inner end is U12T3, the vertical sections 36 are arranged in a row in the order U12T3, U11T1, U32T3, U31T1, U52T3, U51T1, U72T3, and U71T1 as they move radially outward.

[0073] As shown in Figure 15, in the vertical section stack 56 whose radially inner end is U12T2, the vertical sections 36 are arranged in a row in the order U12T2, U11T2, U32T2, U31T2, U52T2, U51T2, U72T2, and U71T2 as they move radially outward.

[0074] As shown in Figure 16, in the vertical section stack 56 whose radially inner end is U12T1, the vertical sections 36 are arranged in a row in the order U12T1, U11T3, U32T1, U31T3, U52T1, U51T3, U72T1, and U71T3 as they move radially outward.

[0075] 13 (see also FIGS. 14 to 16), a vertical section laminate 56 having a radially inner end portion designated U12T3, a vertical section laminate 56 having a radially inner end portion designated U12T2, and a vertical section laminate 56 having a radially inner end portion designated U12T1 are arranged in this order in the circumferential direction to constitute a U-phase conductor group 46U. In this embodiment, the circumferential dimension S3 of the radially inner end portion of the U-phase conductor group 46U is set to be larger than the radial dimension R1 of the vertical section laminate 56 that constitutes the U-phase conductor group 46U.

[0076] The vertical portions 36 of the other coils 16 also form the vertical portion laminate 56 in the same manner as above. The V-phase conductor group 46V and the W-phase conductor group 46W are also formed in the same manner as the U-phase conductor group 46U. The U-phase conductor group 46U, the V-phase conductor group 46V, and the W-phase conductor group 46W are arranged in this order along the circumferential direction.

[0077] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0078] 1, 2, 5, and 9, in the motor 10 of this embodiment, a rotating magnetic field is generated on the inner periphery of the stator 14 by switching the energization of the U-phase coil group 42U, the V-phase coil group 42V, and the W-phase coil group 42W, which constitute a part of the stator 14. This causes the rotor 12 to rotate.

[0079] In this embodiment, the coil body 32 includes a band member 34 formed in a band shape using an insulating material, and a plurality of coils 16 formed on the band member 34. The band member 34 is wound multiple times in the circumferential direction, thereby arranging the plurality of coils 16 at predetermined positions in the circumferential and radial directions. This configuration can prevent the coil body 32 from becoming too large in the radial direction. As a result, the motor 10 can be prevented from becoming too large.

[0080] 13, in this embodiment, the circumferential dimension S3 of the radially inner end (the end closest to the magnet 18 of the rotor 12) of each phase conductor group 46U, 46V, 46W is set to be larger than the radial dimension R1 of the vertical section laminate 56 that constitutes each phase conductor group 46U, 46V, 46W. This setting allows the radial thickness of the coil body 32 to be reduced, thereby reducing the gap between the magnet 18 of the rotor 12 and the stator core 26. This reduces magnetic resistance. This further improves the torque of the motor 10.

[0081] In addition, in this embodiment, the radial dimension R1 of the vertical section lamination body 56 is larger than the circumferential dimension S1. This makes it possible to reduce the area where the vertical section lamination body 56 faces the magnets 18 of the rotor 12 while ensuring the cross-sectional area of ​​the vertical section lamination body 56. This makes it possible to suppress eddy currents that are generated in the vertical section lamination body 56 by radial magnetic flux. As a result, the torque of the motor 10 can be further improved.

[0082] Furthermore, in this embodiment, the circumferential dimension S2 of the vertical sections 36 constituting the vertical section laminated body 56 is larger than the radial dimension R2. This suppresses eddy currents that are generated in the vertical section laminated body 56 due to leakage magnetic flux between the magnets 18 of the rotor 12. As a result, the torque of the motor 10 can be further improved.

[0083] In this embodiment, the U-phase coils 16 are arranged side by side in the circumferential direction, and the U-phase coils 16 are physically wound in one direction. Additionally, the U-phase coils 16 are connected so that, when current is applied to the U-phase coils 16, they function as if the U-phase coils 16 were alternately arranged with the left-handed U-phase coils 16 and the right-handed U-phase coils 16. The V-phase coils 16 and the W-phase coils 16 are also arranged in the same manner as the U-phase coils 16. As a result, in this embodiment, as shown in FIG. 14 and other figures, the potential difference between the vertical portions 36 stacked radially in the vertical portion laminate 56 can be reduced. Specifically, even in a configuration in which vertical portions 36 with different numbers of turns (T1 to T3) are arranged adjacent to each other in the radial direction, the potential difference between the vertical portions 36 stacked radially, such as U12T3 and U11T1, can be reduced. This makes it possible to improve the reliability of insulation between the vertical portions 36 stacked in the radial direction, and to reduce the thickness of the first insulating layer 54A and the second insulating layer 54B.

[0084] (Configuration for suppressing losses due to induced current) Next, a configuration for suppressing loss due to induced current will be described. Note that Figures 1 to 16 used in the above description do not reflect the configuration for suppressing loss due to induced current, which will be described below.

[0085] 17, in this embodiment, the first straight line portion A1, B1, C1, the second straight line portion A2, B2, C2, the third straight line portion A3, B3, C3, the fourth straight line portion A4, B4, C4, the fifth straight line portion A5, B5, C5, and the sixth straight line portion A6, B6, C6 of the coil 16 are divided into two in a direction perpendicular to the direction in which they extend. In the following description, the portion of the first straight line portion A1 that is located inside the coil 16 will be referred to as the "first straight line portion A1 (inner)," and the portion of the first straight line portion A1 that is located outside the coil 16 will be referred to as the "first straight line portion A1 (outer)." Similarly, the first straight line portion B1, the first straight line portion C1, the second straight line portion A2, the second straight line portion B2, the second straight line portion C2, the third straight line portion A3, the third straight line portion B3, the third straight line portion C3, the fourth straight line portion A4, the fourth straight line portion B4, the fourth straight line portion C4, the fifth straight line portion A5, the fifth straight line portion B5, the fifth straight line portion C5, the sixth straight line portion A6, the sixth straight line portion B6, and the sixth straight line portion C6 will be described with an indication of (inside) or (outside) at the end of their reference numerals. In addition, in each drawing, the indication of (inside) or (outside) is omitted in some places in consideration of ease of viewing the drawings.

[0086] As shown in FIG. 17, the first linear portion A1 (inner) and the first linear portion A1 (outer) are spaced apart via a slit 60 (see FIG. 18) formed therebetween and extend parallel to each other.

[0087] The second straight line portion A2 (inner) and the second straight line portion A2 (outer) are spaced apart via a slit 60 formed therebetween and extend parallel to each other. Furthermore, the second straight line portion A2 (inner) and the second straight line portion A2 (outer) are connected to the first straight line portion A1 (inner) and the first straight line portion A1 (outer), respectively.

[0088] The third straight line portion A3 (inner) and the third straight line portion A3 (outer) are spaced apart from each other by a slit 60 formed therebetween and extend parallel to each other. Furthermore, the third straight line portion A3 (inner) and the third straight line portion A3 (outer) are connected to the second straight line portion A2 (inner) and the second straight line portion A2 (outer), respectively.

[0089] The fourth straight line portion A4 (inner) and the fourth straight line portion A4 (outer) are spaced apart from each other by a slit 60 formed therebetween and extend parallel to each other. Furthermore, as shown in Fig. 18, the fourth straight line portion A4 (inner) and the fourth straight line portion A4 (outer) are connected to the third straight line portion A3 (inner) and the third straight line portion A3 (outer), respectively.

[0090] 17, the fifth straight portion A5 (inner) and the fifth straight portion A5 (outer) are spaced apart via a slit 60 formed therebetween and extend parallel to each other. Furthermore, the fifth straight portion A5 (inner) and the fifth straight portion A5 (outer) are connected to the fourth straight portion A4 (inner) and the fourth straight portion A4 (outer), respectively.

[0091] The sixth straight portion A6 (inner) and the sixth straight portion A6 (outer) are spaced apart from each other via a slit 60 formed therebetween and extend parallel to each other. Furthermore, the sixth straight portion A6 (inner) and the sixth straight portion A6 (outer) are connected to the fifth straight portion A5 (inner) and the fifth straight portion A5 (outer), respectively.

[0092] The first straight line section B1 (inner), first straight line section B1 (outer), second straight line section B2 (inner), second straight line section B2 (outer), third straight line section B3 (inner), third straight line section B3 (outer), fourth straight line section B4 (inner), fourth straight line section B4 (outer), fifth straight line section B5 (inner), fifth straight line section B5 (outer), sixth straight line section B6 (inner), and sixth straight line section B6 (outer) are configured in the same manner as the first straight line section A1 (inner), first straight line section A1 (outer), second straight line section A2 (inner), second straight line section A2 (outer), third straight line section A3 (inner), third straight line section A3 (outer), fourth straight line section A4 (inner), fourth straight line section A4 (outer), fifth straight line section A5 (inner), fifth straight line section A5 (outer), sixth straight line section A6 (inner), and sixth straight line section A6 (outer), respectively. In addition, the first straight part C1 (inside), the first straight part C1 (outside), the second straight part C2 (inside), the second straight part C2 (outside), the third straight part C3 (inside), the third straight part C3 (outside), 4th straight part C4 (inside), 4th straight part C4 (outside), 5th straight part C5 (inside), 5th straight part C5 (outside), 6th straight part C6 (inside), 6th straight part C6 (outside) is also the 1st straight part A The coils 16 (U11-U13) have the same configuration as the coils 16 (U11-U13), respectively. The coils 16 (U21-U83, V11-V83, W11-W83) (not shown) have the same configuration as the coils 16 (U11-U13). ...

[0093] An end of the first straight portion A1 (inner) opposite the second straight portion A2 (inner) and an end of the first straight portion A1 (outer) opposite the second straight portion A2 (outer) are connected via a first connection portion 62. Note that this first connection portion 62 is, for example, a part of the connection portion 43. Furthermore, an end of the sixth straight portion A6 (inner) opposite the fifth straight portion A5 (inner) and an end of the sixth straight portion A6 (outer) opposite the fifth straight portion A5 (outer) are connected via a second connection portion 64. Note that, for example, this second connection portion 64 is a portion where the sixth straight portion A6 (inner) and the sixth straight portion A6 (outer) are integrally joined, or a via that straddles the sixth straight portion A6 (inner) and the sixth straight portion A6 (outer) attached to the band member 34 (see FIG. 7 ). As a result, a closed circuit 66 is formed in which the path formed by the first straight section A1 (outer), the second straight section A2 (outer), the third straight section A3 (outer), the fourth straight section A4 (outer), the fifth straight section A5 (outer) and the sixth straight section A6 (outer) and the path formed by the first straight section A1 (inner), the second straight section A2 (inner), the third straight section A3 (inner), the fourth straight section A4 (inner), the fifth straight section A5 (inner) and the sixth straight section A6 (inner) are connected by the first connection section 62 and the second connection section 64.

[0094] An end of the first straight portion B1 (inner) opposite to the second straight portion B2 (inner) and an end of the first straight portion B1 (outer) opposite to the second straight portion B2 (outer) are connected via a first connecting portion 62. Note that, as an example, this first connecting portion 62 is a portion where the first straight portion B1 (inner) and the first straight portion B1 (outer) are integrally joined, or a via that straddles the first straight portion B1 (inner) and the first straight portion B1 (outer) attached to the band member 34 (see FIG. 7 ). Furthermore, an end of the sixth straight portion B6 (inner) opposite to the fifth straight portion B5 (inner) and an end of the sixth straight portion B6 (outer) opposite to the fifth straight portion B5 (outer) are connected via a second connecting portion 64. Note that the second connection portion 64 is, for example, a portion where the sixth straight portion B6 (inner) and the sixth straight portion B6 (outer) are integrally joined, or a via that straddles the sixth straight portion B6 (inner) and the sixth straight portion B6 (outer) attached to the band member 34 (see FIG. 7 ). As a result, a closed circuit 66 is formed in which the path formed by the first straight portion B1 (outer), the second straight portion B2 (outer), the third straight portion B3 (outer), the fourth straight portion B4 (outer), the fifth straight portion B5 (outer), and the sixth straight portion B6 (outer) is connected to the path formed by the first straight portion B1 (inner), the second straight portion B2 (inner), the third straight portion B3 (inner), the fourth straight portion B4 (inner), the fifth straight portion B5 (inner), and the sixth straight portion B6 (inner) by the first connection portion 62 and the second connection portion 64.

[0095] An end of the first straight portion C1(inner) opposite to the second straight portion C2(inner) and an end of the first straight portion C1(outer) opposite to the second straight portion C2(outer) are connected via a first connection portion 62. Note that, as an example, this first connection portion 62 is a portion where the first straight portion C1(inner) and the first straight portion C1(outer) are integrally joined, or a via that straddles the first straight portion C1(inner) and the first straight portion C1(outer) attached to the band member 34 (see FIG. 7). Furthermore, an end of the sixth straight portion C6(inner) opposite to the fifth straight portion C5(inner) and an end of the sixth straight portion C6(outer) opposite to the fifth straight portion C5(outer) are connected via a second connection portion 64. Note that, as an example, this second connection portion 64 is a part of the connection pattern portion 40. As a result, a closed circuit 66 is formed in which the path formed by the first straight section C1 (outer), the second straight section C2 (outer), the third straight section C3 (outer), the fourth straight section C4 (outer), the fifth straight section C5 (outer) and the sixth straight section C6 (outer) and the path formed by the first straight section C1 (inner), the second straight section C2 (inner), the third straight section C3 (inner), the fourth straight section C4 (inner), the fifth straight section C5 (inner) and the sixth straight section C6 (inner) are connected by the first connection section 62 and the second connection section 64.

[0096] As described above, in this embodiment, the closed circuit 66 is formed in each of the first, second, and third turns of the coil 16. In other words, the closed circuit 66 is formed for each turn of the coil 16.

[0097] 19 schematically shows a portion of the coil 16 where the first turn is formed and the magnet 18 that constitutes a part of the rotor 12. Here, the circumferential pitch from the second straight portion A1 (outside) to the fifth straight portion A5 (inside) is defined as P1 (deg), and the circumferential pitch from the end of the N-pole magnet 18 on one side in the rotation direction to the end of the S-pole magnet 18 on one side in the rotation direction is defined as P2 (deg). In this embodiment, P1 and P2 are set to the same circumferential pitch. Note that the circumferential pitch P1 from the second straight portion B1 (outside) to the fifth straight portion B5 (inside) and the circumferential pitch P1 from the second straight portion C1 (outside) to the fifth straight portion C5 (inside) are also set to the same circumferential pitch as P2.

[0098] 19 and 20, the arrow i1 indicates the induced current generated in the coil 16 when the north-pole magnet 18 passes over the coil 16. This induced current i1 flows through the third straight section A3 (inner), the second straight section A2 (inner), the first straight section A1 (inner), the first connection section 62, the first straight section A1 (outer), the second straight section A2 (outer), and the third straight section A3 (outer) in this order.

[0099] 21 and 22, the arrow i2 indicates the induced current generated in the coil 16 when the south pole magnet 18 passes over the coil 16. This induced current i2 flows through the fourth straight section A4 (inner), the fifth straight section A5 (inner), the sixth straight section A6 (inner), the second connection section 64, the sixth straight section A6 (outer), the fifth straight section A5 (outer), and the fourth straight section A4 (outer) in this order.

[0100] 23 and 24, the induced currents i1 and i2 flowing in the coil 16 flow so as to cancel each other out. That is, the electromotive force that tries to pass the induced current i1 and the electromotive force that tries to pass the induced current i2 cancel each other out. In this embodiment, as shown in FIG. 25, when the rotor 12 rotates through an electrical machine angle of 360 degrees, the induced currents i1 and i2 cancel each other out, and the combined current i3 of the induced currents flowing in the coil 16 becomes almost zero.

[0101] As described above, in the motor 10 of this embodiment, by dividing the multiple straight sections into two, the opposing area with the magnet 18 is reduced, making it possible to reduce the local induced current generated in the coil 16 when the magnet 18 passes over the coil 16. In addition, the combined current i3 of the induced currents generated in the closed circuit 66 formed by dividing the multiple straight sections into two when the magnet 18 passes over the coil 16 can be reduced to almost zero. This suppresses the occurrence of loss due to the induced current. As a result, it is possible to improve torque while suppressing an increase in the physical size of the motor 10. Furthermore, by suppressing the occurrence of loss due to the induced current, it is possible to suppress heat generation in the coil 16. This allows for a motor 10 with low heat generation.

[0102] Furthermore, in this embodiment, a closed circuit 66 is formed in each of the first, second, and third turns of the coil 16. This allows induced current to be canceled in each turn, allows the ends of one side of the coils 16 to be connected in parallel, and makes it easy to connect the wires between the coils 16 and to connect the neutral point.

[0103] (Second embodiment) Next, a motor 48 of a second embodiment will be described. In the motor 48 of the second embodiment, the members and parts corresponding to those of the motor 10 of the first embodiment described above will be denoted by the same reference numerals as those corresponding to those of the motor 10 of the first embodiment, and the description thereof may be omitted.

[0104] As shown in Figures 26, 27, and 28, the motor 48 of this embodiment is configured in the same way as the motor 10 of the first embodiment described above, except that one closed circuit 66 is formed for one coil 16.

[0105] As shown in Figures 26 and 28, the path of the first straight line portion A1 (outer), the second straight line portion A2 (outer), the third straight line portion A3 (outer), the fourth straight line portion A4 (outer), the fifth straight line portion A5 (outer), the sixth straight line portion A6 (outer), the first straight line portion B1 (outer), the second straight line portion B2 (outer), the third straight line portion B3 (outer), the fourth straight line portion B4 (outer), the fifth straight line portion B5 (outer), the sixth straight line portion B6 (outer), the first straight line portion C1 (outer), the second straight line portion C2 (outer), the third straight line portion C3 (outer), the fourth straight line portion C4 (outer), the fifth straight line portion C5 (outer) and the sixth straight line portion C6 (outer) is shown. A closed circuit 66 is formed by connecting the path of the second straight section A2 (inside), the third straight section A3 (inside), the fourth straight section A4 (inside), the fifth straight section A5 (inside), the sixth straight section A6 (inside), the first straight section B1 (inside), the second straight section B2 (inside), the third straight section B3 (inside), the fourth straight section B4 (inside), the fifth straight section B5 (inside), the sixth straight section B6 (inside), the first straight section C1 (inside), the second straight section C2 (inside), the third straight section C3 (inside), the fourth straight section C4 (inside), the fifth straight section C5 (inside) and the sixth straight section C6 (inside) by the first connecting section 62 and the second connecting section 64.

[0106] 27 and 28, in the motor 48 of this embodiment, the induced currents i1 and i2 flowing in the coil 16 also flow so as to cancel each other out. This suppresses the occurrence of loss due to the induced currents, and improves the torque while suppressing an increase in the physical size of the motor 48.

[0107] Furthermore, in this embodiment, one closed circuit 66 is formed for one coil 16. This allows the induced current to be cancelled for each coil 16.

[0108] (Third embodiment) Next, a motor according to a third embodiment will be described. In the motor according to the third embodiment, the components and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and their description may be omitted.

[0109] As shown in Figures 29 and 30, the motor of this embodiment is configured in the same way as the motor 10 of the first embodiment described above, except that one closed circuit 66 is formed for three coils 16 connected in series.

[0110] A closed circuit 66 is formed by connecting the path from the first straight portion A1 (outside) to the sixth straight portion C6 (outside) of the first coil 16 (U11), the sixth straight portion C6 (outside) to the first straight portion A1 (outside) of the second coil 16 (U12), and the first straight portion A1 (outside) to the sixth straight portion C6 (outside) of the third coil 16 (U13) with the path from the first straight portion A1 (inside) to the sixth straight portion C6 (inside) of the first coil 16 (U11), the sixth straight portion C6 (inside) to the first straight portion A1 (inside) of the second coil 16 (U12), and the first straight portion A1 (inside) to the sixth straight portion C6 (inside) of the third coil 16 (U13) by the first connecting portion 62 and the second connecting portion 64. The coils 16 (U21 to U83, V11 to V83, W11 to W83) not shown in the figure have the same relationship as the coils 16 (U11 to U13).

[0111] In order to connect the three coils 16 in series as described above, each part of the connection pattern portion 40 is appropriately formed on one surface 34A and the other surface 34B of the band member 34 (see Figure 7, etc.) through vias 70.

[0112] 29 and 30, in the motor of this embodiment, the induced currents i1 and i2 flowing in the coil 16 also flow so as to cancel each other out. Note that the double arrows indicating the induced currents in Fig. 29 respectively indicate the induced currents flowing on one surface 34A of the band member 34 and the induced currents flowing on the other surface 34B. This suppresses losses due to the induced currents, and improves torque while suppressing an increase in the motor size.

[0113] Furthermore, in this embodiment, one closed circuit 66 is formed for the plurality of coils 16. This allows the induced current to be cancelled for each of the plurality of coils 16.

[0114] (Fourth embodiment) Next, a motor according to a fourth embodiment will be described. In the motor according to the fourth embodiment, the components and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and their description may be omitted.

[0115] As shown in FIGS. 31 and 32, the motor of this embodiment is configured similarly to the motor of the third embodiment described above, except that the configuration of the connection pattern section 40 is different.

[0116] As shown in FIG. 31 , the sixth straight portion C6 (outside) of the first coil 16 (U11) and the sixth straight portion C6 (inside) of the second coil 16 (U12) are connected via a connection pattern portion 40. The sixth straight portion C6 (inside) of the first coil 16 (U11) and the sixth straight portion C6 (outside) of the second coil 16 (U12) are connected via a connection pattern portion 40. The first straight portion C1 (outside) of the second coil 16 (U12) and the first straight portion C1 (inside) of the third coil 16 (U13) are connected via a connection pattern portion 40. The first straight portion C1 (inside) of the second coil 16 (U12) and the first straight portion C1 (outside) of the third coil 16 (U13) are connected via a connection pattern portion 40. In this embodiment, the connection pattern portion 40 does not include a via 70 (see FIG. 29 ).

[0117] 31 and 32, in the motor of this embodiment, the induced currents i1 and i2 flowing in the coil 16 also flow so as to cancel each other out. This prevents losses caused by the induced currents, and improves torque while preventing an increase in the motor size.

[0118] (Fifth embodiment) Next, a motor 72 of a fifth embodiment will be described. In the motor 72 of the fifth embodiment, the members and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and the description thereof will be omitted.

[0119] As shown in FIGS. 33 and 34, the motor 72 of this embodiment has a first straight line portion A1 (outer), a second straight line portion A2 (outer), a third straight line portion A3 (outer), a fourth straight line portion A4 (outer), a fifth straight line portion A5 (outer), a sixth straight line portion A6 (outer), a first straight line portion B1 (outer), a second straight line portion B2 (outer), a third straight line portion B3 (outer), a fourth straight line portion B4 (outer), a fifth straight line portion B5 (outer), a sixth straight line portion B6 (outer), a first straight line portion C1 (outer), a second straight line portion C2 (outer), a third straight line portion C3 (outer), a fourth straight line portion C4 (outer), a fifth straight line portion C5 (outer), and a sixth straight line portion A6 (outer). The straight line portion C6 (outer) is connected in parallel to the first straight line portion A1 (inner), the second straight line portion A2 (inner), the third straight line portion A3 (inner), the fourth straight line portion A4 (inner), the fifth straight line portion A5 (inner), the sixth straight line portion A6 (inner), the first straight line portion B1 (inner), the second straight line portion B2 (inner), the third straight line portion B3 (inner), the fourth straight line portion B4 (inner), the fifth straight line portion B5 (inner), the sixth straight line portion B6 (inner), the first straight line portion C1 (inner), the second straight line portion C2 (inner), the third straight line portion C3 (inner), the fourth straight line portion C4 (inner), the fifth straight line portion C5 (inner) and the sixth straight line portion C6 (inner).

[0120] Furthermore, in the motor 72 of this embodiment, the first straight line portion A1 (outer), the second straight line portion A2 (outer), the third straight line portion A3 (outer), the fourth straight line portion A4 (outer), the fifth straight line portion A5 (outer), the sixth straight line portion A6 (outer), the first straight line portion B1 (outer), the second straight line portion B2 (outer), the third straight line portion B3 (outer), the fourth straight line portion B4 (outer), the fifth straight line portion B5 (outer), the sixth straight line portion B6 (outer), the first straight line portion C1 (outer), the second straight line portion C2 (outer), the third straight line portion C3 (outer), the fourth straight line portion C4 (outer), the fifth straight line portion C5 (outer), and the sixth straight line portion C6 (outer) can be said to form an outer coil 74, which is a part of the coil 16.

[0121] In addition, in the motor 72 of this embodiment, the first straight portion A1 (inside), the second straight portion A2 (inside), the third straight portion A3 (inside), the fourth straight portion A4 (inside), the fifth straight portion A5 (inside), the sixth straight portion A6 (inside), the first straight portion B1 (inside), the second straight portion B2 (inside), the third straight portion B3 (inside), the fourth straight portion B4 (inside), the fifth straight portion B5 (inside), the sixth straight portion B6 (inside), the first straight portion C1 (inside), the second straight portion C2 (inside), the third straight portion C3 (inside), the fourth straight portion C4 (inside), the fifth straight portion C5 (inside), and the sixth straight portion C6 (inside) form an inner coil 76, which is another part of the coil 16. The inner coil 76 is disposed inside the outer coil 74.

[0122] The other configurations of the motor 72 of this embodiment are the same as those of the motor 48 of the second embodiment described above.

[0123] 33, 34, and 35, in the motor 72 of this embodiment, the induced currents i1 and i2 flowing in the outer coil 74 and the inner coil 76 also flow so as to cancel each other out. This suppresses the occurrence of loss due to the induced currents, and improves torque while suppressing an increase in the physical size of the motor 72.

[0124] Furthermore, in this embodiment, one closed circuit 66 is formed for each pair of the outer coil 74 and the inner coil 76. This allows the induced current to be cancelled for each pair of the outer coil 74 and the inner coil 76.

[0125] (Sixth embodiment) Next, a motor according to a sixth embodiment will be described. In the motor according to the sixth embodiment, the components and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and their description may be omitted.

[0126] As shown in FIG. 36, in the coil 16 of the motor of this embodiment, the fourth straight portion A4 (inner) and the fourth straight portion A4 (outer) are connected to the third straight portion A3 (outer) and the third straight portion A3 (inner), respectively. Furthermore, the first straight portion B1 (inner) and the first straight portion B1 (outer) are connected to the sixth straight portion A6 (outer) and the sixth straight portion A6 (inner), respectively. Similarly, as shown in FIG. 37, the fourth straight portion B4 (inner) and the fourth straight portion B4 (outer) are connected to the third straight portion A3 (outer) and the third straight portion A3 (inner), respectively. Furthermore, the first straight portion C1 (inner) and the first straight portion C1 (outer) are connected to the sixth straight portion B6 (outer) and the B straight portion A6 (inner), respectively. That is, in the coil 16 of this embodiment, the relationship between "(inside)" and "(outside)" is reversed in the portion of the path of the coil 16 where it folds back from one side in the axial direction to the other side, and the relationship between "(inside)" and "(outside)" is reversed in the portion of the path of the coil 16 where it folds back from the other side in the axial direction to one side.

[0127] Furthermore, as shown in Figures 36 and 37, in the motor of this embodiment, the axial positions of the portions of the path of the coil 16 that are folded back from one axial side to the other are the same, and the axial positions of the portions of the path of the coil 16 that are folded back from the other axial side to one side are the same.

[0128] In detail, the axial position of the portion that folds back from the third straight section A3 (outside) to the fourth straight section A4 (inside), the axial position of the portion that folds back from the third straight section A3 (inside) to the fourth straight section A4 (outside), the axial position of the portion that folds back from the third straight section B3 (outside) to the fourth straight section B4 (inside), the axial position of the portion that folds back from the third straight section B3 (inside) to the fourth straight section B4 (outside), the axial position of the portion that folds back from the third straight section C3 (outside) to the fourth straight section C4 (inside), and the axial position of the portion that folds back from the third straight section C3 (inside) to the fourth straight section C4 (outside) are all arranged at the same axial position.

[0129] In addition, the axial position of the portion that folds back from the sixth straight section A6 (outside) to the first straight section B1 (inside), the axial position of the portion that folds back from the sixth straight section A6 (inside) to the first straight section B1 (outside), the axial position of the portion that folds back from the sixth straight section B6 (outside) to the first straight section C1 (inside), and the axial position of the portion that folds back from the sixth straight section B6 (inside) to the first straight section C1 (outside) are all arranged at the same axial position.

[0130] 38, the sixth straight portion C6 (inner) of the coil 16 (U13) constituting the U phase, the sixth straight portion C6 (inner) of the coil 16 (V13) constituting the V phase, and the sixth straight portion C6 (inner) of the coil 16 (W13) constituting the W phase are connected to one another by a neutral point 44. In addition, the sixth straight portion C6 (outer) of the coil 16 (U13) constituting the U phase, the sixth straight portion C6 (outer) of the coil 16 (V13) constituting the V phase, and the sixth straight portion C6 (outer) of the coil 16 (W13) constituting the W phase are connected to one another by a neutral point 44.

[0131] With the above configuration, as shown in FIG. 38, a closed circuit 66 is formed in which a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (U11), the sixth straight portion C6 (inner) to the first straight portion A1 (outer) of the coil 16 (U12), and the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (U13), and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (U11), the sixth straight portion C6 (outer) to the first straight portion A1 (inner) of the coil 16 (U12), and the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (U13), are connected by the first wiring portion 62 of the U phase, the first wiring portion 62 of the V phase, and the first wiring portion 62 of the W phase. That is, when viewed from the U-phase, the first wire connection 62 of the V-phase and the first wire connection 62 of the W-phase function as the second wire connection 64.

[0132] In addition, a closed circuit 66 is formed in which a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (V11), the sixth straight portion C6 (inner) to the first straight portion A1 (outer) of the coil 16 (V12), and the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (V13), and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (V11), the sixth straight portion C6 (outer) to the first straight portion A1 (inner) of the coil 16 (V12), and the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (V13), are connected by a first wiring portion 62 of the V phase, a first wiring portion 62 of the U phase, and a first wiring portion 62 of the W phase. That is, when viewed from the V-phase, the first wire connection 62 of the U-phase and the first wire connection 62 of the W-phase function as the second wire connection 64.

[0133] In addition, a closed circuit 66 is formed in which a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (W11), the sixth straight portion C6 (inner) to the first straight portion A1 (outer) of the coil 16 (W12), and the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the coil 16 (W13), and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (W11), the sixth straight portion C6 (outer) to the first straight portion A1 (inner) of the coil 16 (W12), and the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the coil 16 (W13), are connected by a first wiring portion 62 of the W phase, a first wiring portion 62 of the U phase, and a first wiring portion 62 of the V phase. That is, when viewed from the W-phase, the first wire connection 62 of the U-phase and the first wire connection 62 of the V-phase function as the second wire connection 64.

[0134] The coils 16 (U21 to U83, V21 to V83, W21 to W83) not shown in the figure have the same relationship as the coils 16 (U11 to U13, V11 to V13, W11 to W13).

[0135] In the motor of this embodiment described above, as shown in FIG. 39 , the induced current iU flowing through the U-phase coil 16 can be canceled out by the induced current iV flowing through the V-phase coil 16 and the induced current iW flowing through the W-phase coil 16. As an example, let the induced current iU flowing through the U-phase coil 16 be 1, and let the induced current iV flowing through the V-phase coil 16 and the induced current iW flowing through the W-phase coil 16 be −0.5. Then, the induced current iU flowing through the U-phase coil 16 is canceled out by the induced current iV flowing through the V-phase coil 16 and the induced current iW flowing through the W-phase coil 16. In this way, in the motor of this embodiment, the combined current i3 of the induced currents flowing through the coils 16 of each phase is approximately zero. This suppresses losses due to induced currents, thereby improving torque while minimizing an increase in the motor's size.

[0136] 36 and 37, in the motor of this embodiment, the axial positions of the portions of the path of the coil 16 that are folded back from one axial side to the other are the same, and the axial positions of the portions of the path of the coil 16 that are folded back from the other axial side to one side are the same. This makes it possible to suppress an increase in the axial dimension of the coil end portion 38. As a result, it is possible to suppress an increase in the axial dimension of the coil 16.

[0137] Seventh embodiment Next, a motor according to a seventh embodiment will be described. In the motor according to the seventh embodiment, the members and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and their description may be omitted.

[0138] 40 and 41, the motor of this embodiment has a configuration that combines the configuration of the motor 72 of the fifth embodiment and the configuration of the motor of the sixth embodiment. Here, in the motor of this embodiment, the first coil 78 and the second coil 80, which correspond to the outer coil 74 and the inner coil 76 in the motor 72 of the fifth embodiment, have the same shapes and dimensions as each other. In addition, the second coil 80 is disposed offset to one side in the circumferential direction with respect to the first coil 78.

[0139] In the motor of the present embodiment described above, the induced current iU flowing through the U-phase first coil 78 and second coil 80 can also be canceled out by the induced current iV flowing through the V-phase first coil 78 and second coil 80 and the induced current iW flowing through the W-phase first coil 78 and second coil 80. This prevents losses due to induced currents, and improves torque while preventing an increase in the motor size.

[0140] (Eighth embodiment) Next, a motor 82 of an eighth embodiment will be described. In the motor 82 of the eighth embodiment, the members and parts corresponding to those of the motor 10 of the first embodiment described above will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and the description thereof may be omitted.

[0141] 42 and 43 show the multiple coils 16 that constitute the U phase in the motor 82 of this embodiment. As shown in these figures, the number of the multiple coils 16 that constitute the U phase is an even number. That is, the number of the multiple coils 16 that constitute the U phase is 2n (n is a natural number). In this embodiment, n is 3. Here, the six coils 16 that constitute the U phase will be referred to as the first coil 16 to the sixth coil 16 in order from the other circumferential side to the one circumferential side. Counting the multiple coils 16 that constitute the U phase from the side opposite the neutral point 44, one end of the 2m-1th coil 16 is connected via the first connection 62, and one end of the 2mth coil 16 is connected via the second connection 64. The other end of the 2m-1th coil 16 is connected to the other end of the 2mth coil 16. Note that m is a natural number that satisfies m≦n. As a result, one closed circuit 66 is formed for two coils 16 that constitute the U phase and are electrically continuous.

[0142] More specifically, the configuration of each coil 16 constituting the U phase is similar to that of the coil 16 of the motor of the sixth embodiment. A closed circuit 66 is formed by connecting a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the first coil 16 and the sixth straight portion C6 (outer) to the first straight portion A1 (inner) of the second coil 16 and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the first coil 16 and the sixth straight portion C6 (inner) to the first straight portion A1 (outer) of the second coil 16 by a first connection portion 62 and a second connection portion 64.

[0143] In addition, a closed circuit 66 is formed in which a path including the first straight portion A1 (outside) to the sixth straight portion C6 (inside) of the third coil 16 and the sixth straight portion C6 (outside) to the first straight portion A1 (inside) of the fourth coil 16 is connected to a path including the first straight portion A1 (inside) to the sixth straight portion C6 (outside) of the third coil 16 and the sixth straight portion C6 (inside) to the first straight portion A1 (outside) of the fourth coil 16 by a first connection portion 62 and a second connection portion 64.

[0144] In addition, a closed circuit 66 is formed in which a path including the first straight portion A1 (outside) to the sixth straight portion C6 (inside) of the fifth coil 16 and the sixth straight portion C6 (outside) to the first straight portion A1 (inside) of the sixth coil 16 is connected to a path including the first straight portion A1 (inside) to the sixth straight portion C6 (outside) of the fifth coil 16 and the sixth straight portion C6 (inside) to the first straight portion A1 (outside) of the sixth coil 16 by a first connection portion 62 and a second connection portion 64.

[0145] The plurality of coils 16 constituting the V phase and the plurality of coils 16 constituting the W phase (not shown) are also connected in the same manner as the plurality of coils 16 constituting the U phase.

[0146] 42 and 43, in the motor 82 of the present embodiment described above, one closed circuit 66 is formed for two coils 16 of the same phase that are adjacent in the circumferential direction. This makes it possible to cancel out the induced current for every two coils 16. As a result, the occurrence of loss due to the induced current is suppressed, and torque can be improved while suppressing an increase in the physical size of the motor 82.

[0147] (Ninth embodiment) Next, a motor according to a ninth embodiment will be described. In the motor according to the ninth embodiment, the components and parts corresponding to those of the motor 10 of the first embodiment will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and their description may be omitted.

[0148] FIG. 44 shows the multiple coils 16 that constitute the U phase in the motor of this embodiment. As shown in this figure, the number of the multiple coils 16 that constitute the U phase is an odd number. That is, the number of the multiple coils 16 that constitute the U phase is 2n+1 (n is a natural number). In this embodiment, n is 2. Here, the five coils 16 that constitute the U phase will be referred to as the first coil 16 to the fifth coil 16 in order from the other circumferential side to one side. Counting the multiple coils 16 that constitute the U phase from the side opposite the neutral point 44, one end of the 2m-1th coil 16 is connected via a first connection 62, and one end of the 2mth coil 16 is connected via a second connection 64. The other end of the 2m-1th coil 16 is connected to the other end of the 2mth coil 16. Note that m is a natural number that satisfies m≦n. This results in one closed circuit 66 being formed between the first coil 16 and the second coil 16 which are electrically continuous, and one closed circuit 66 being formed between the third coil 16 and the fourth coil 16 which are electrically continuous.

[0149] The arrangement and wiring of the first coil 16 to the fifth coil 16 are the same as those of the motor 82 of the eighth embodiment, except for the points described below.

[0150] 45, the sixth straight portion C6 (inner) of the fifth coil 16 constituting the U phase, the sixth straight portion C6 (inner) of the fifth coil 16 constituting the V phase, and the sixth straight portion C6 (inner) of the fifth coil 16 constituting the W phase are connected to one another by a neutral point 44. In addition, the sixth straight portion C6 (outer) of the fifth coil 16 constituting the U phase, the sixth straight portion C6 (outer) of the fifth coil 16 constituting the V phase, and the sixth straight portion C6 (outer) of the fifth coil 16 constituting the W phase are connected to one another by a neutral point 44.

[0151] With the above configuration, a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the fifth coil 16 constituting the U phase and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the fifth coil 16 constituting the U phase are connected by the U-phase first connection portion 62, the V-phase first connection portion 62, and the W-phase first connection portion 62 to form a closed circuit 66. In other words, when viewed from the U phase, the V-phase first connection portion 62 and the W-phase first connection portion 62 function as the second connection portion 64.

[0152] Furthermore, a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the fifth coil 16 constituting the V phase and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the fifth coil 16 constituting the V phase are connected by a V-phase first connection portion 62, a U-phase first connection portion 62, and a W-phase first connection portion 62 to form a closed circuit 66. In other words, when viewed from the V phase, the U-phase first connection portion 62 and the W-phase first connection portion 62 function as a second connection portion 64.

[0153] Furthermore, a path including the first straight portion A1 (outer) to the sixth straight portion C6 (inner) of the fifth coil 16 constituting the W phase and a path including the first straight portion A1 (inner) to the sixth straight portion C6 (outer) of the fifth coil 16 constituting the W phase are connected by a W-phase first connection portion 62, a U-phase first connection portion 62, and a V-phase first connection portion 62 to form a closed circuit 66. In other words, when viewed from the W phase, the U-phase first connection portion 62 and the V-phase first connection portion 62 function as a second connection portion 64.

[0154] In the motor of this embodiment described above, in the first to fourth coils 16 of each phase, induced currents can be canceled out between every two circumferentially adjacent coils 16 of the same phase. Furthermore, in the motor of this embodiment, induced current iU flowing in the fifth coil 16 of one phase (U phase in FIG. 45) can be canceled out by induced currents iV and iW flowing in the fifth coils 16 of the other two phases (V phase and W phase in FIG. 45). As a result, loss due to induced currents is suppressed, and torque can be improved while suppressing an increase in the motor size.

[0155] (Tenth embodiment) Next, a motor 84 of a tenth embodiment will be described. In the motor 84 of the tenth embodiment, the members and parts corresponding to those of the motor 10 of the first embodiment described above will be denoted by the same reference numerals as those of the motor 10 of the first embodiment, and the description thereof may be omitted.

[0156] As shown in Figures 46 to 48, in the motor 84 of the tenth embodiment, the coils 16 of a predetermined phase formed in one layer and the coils 16 of a predetermined phase formed in another layer are arranged in a radially overlapping state with being offset in the circumferential direction.

[0157] More specifically, each coil 16 arranged in the second layer is offset by an angle P3 toward the other circumferential side from each coil 16 arranged in the first layer. Each coil 16 arranged in the third layer is offset by an angle P3 toward the other circumferential side from each coil 16 arranged in the second layer. Each coil 16 arranged in the fourth layer is offset by an angle P3 toward the other circumferential side from each coil 16 arranged in the third layer. The coils 16 may be divided via the slits 60 described above, or may not be divided (i.e., without the slits 60). The figures of this embodiment show a configuration without the slits 60.

[0158] FIG. 47 is a schematic diagram showing three U-phase coils 16 arranged in the first layer and connected in series, offset from three U-phase coils 16 arranged in the second layer and connected in series, in an axial direction. As shown in this figure, the other ends of the three U-phase coils 16 arranged in the first layer and connected in series are connected in parallel to the other ends of the three U-phase coils 16 arranged in the second layer and connected in series, forming a first connection 62. A similar relationship is established for the V-phase and W-phase coils (not shown). Furthermore, one end of each of the three U-phase coils 16 arranged in the first layer and connected in series is connected to the neutral point of the other phase. The neutral point of the other phase here refers to one end of each of the three V-phase coils 16 arranged in the first layer and connected in series, and one end of each of the three W-phase coils 16 arranged in the first layer and connected in series, as shown in FIG. 48. Furthermore, one end of each of the three U-phase coils 16 arranged in the second layer and connected in series is connected to the neutral point of the other phase. The neutral point of the other phase here refers to one end of each of the three V-phase coils 16 arranged in the second layer and connected in series, and one end of each of the three W-phase coils 16 arranged in the second layer and connected in series, as shown in FIG. 48 . As a result, a closed circuit 66 is formed by connecting the U-phase first connection 62 with the V-phase first connection 62 and the W-phase first connection 62. That is, when viewed from the U-phase, the V-phase first connection 62 and the W-phase first connection 62 function as the second connection 64. When viewed from the V-phase, the U-phase first connection 62 and the W-phase first connection 62 function as the second connection 64. When viewed from the W-phase, the first wire connection 62 of the U-phase and the first wire connection 62 of the V-phase function as the second wire connection 64.

[0159] In the motor 84 of the tenth embodiment described above, the induced current iU flowing through the U-phase coils 16 in the first and second layers can also be canceled out by the induced current iV flowing through the V-phase coils 16 in the first and second layers and the induced current iW flowing through the W-phase coils 16 in the first and second layers. Furthermore, because the first through fourth layers are configured in a similar relationship, the induced currents flowing through the coils 16 of each phase, between the second and third layers, between the third and fourth layers, and between the fourth and first layers, can be canceled out. This reduces losses due to induced currents, improving torque while minimizing an increase in the motor's size.

[0160] In this embodiment, the coils 16 of a predetermined phase formed on one layer and the coils 16 of a predetermined phase formed on another layer are radially overlapped and offset in the circumferential direction. This allows for sequential, stepwise switching of the magnetic flux. This allows for smoother rotation of the motor 84 (rotation of the rotor 12) and quieter operation of the motor 84. The offset angle P3 of the coils 16 may be constant or may vary between layers. This also includes unintentional offset angles due to manufacturing variations in the formation of the coil body 32. When the coils 16 are configured to be divided via the slits 60, any of the configurations shown in the first to ninth embodiments may be combined.

[0161] In the above example, each portion of the coil 16 is divided into two parts via the slits 60, but the present invention is not limited to this. For example, each portion of the coil 16 may be divided into three parts via the slits 60, as in the coil 16 of the motor of the eleventh embodiment shown in Fig. 49. Furthermore, although not shown in the drawings, each portion of the coil 16 may be divided into four or more parts via the slits 60.

[0162] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above and can be implemented in various other modified forms without departing from the spirit of the present disclosure. Furthermore, all or part of the configurations of the embodiments described above can be combined with each other.

[0163] For example, although the example has been shown in which the multiple coils 16 on the band member 34 are connected in a star connection, they may also be connected in a delta connection. Furthermore, the number of poles, number of coils, number of phases, and number of coils connected in series or in parallel of the motor 10 or the like may be appropriately selected depending on the application of the motor 10 or the like. The configuration of the motor 10 or the like may also be applied to a generator. The configuration of the motor 10 or the like may also be applied to an outer rotor brushless motor in which the rotor 12 is disposed radially outside the stator 14. The configuration of the present disclosure may also be applied to a rotor configured to include a coil body 32. [Explanation of symbols]

[0164] 10 motor (rotating electric machine), 12 rotor (rotor), 14 stator (armature, stator), 16 coil, 18 magnet, 32 coil body, 34 band member, 62 first connection portion, 64 second connection portion, 66 closed circuit, 68 motor (rotating electric machine), 72 motor (rotating electric machine), 82 motor (rotating electric machine), 84 motor (rotating electric machine)

Claims

1. a belt member (34) formed in a belt shape using an insulating material and wound in a circumferential direction; a plurality of coils (16) formed on the band member using a conductive material and arranged side by side along a circumferential direction, the coils having a plurality of paths through which a current flows and which form part of a closed circuit (66); a first connection portion (62) that forms part of the closed circuit and connects the plurality of paths; a second connection portion (64) that constitutes another part of the closed circuit and connects the plurality of paths or the plurality of coils so that currents flowing in the closed circuit due to electromagnetic induction caused by circumferential movement of the magnet are canceled out in the closed circuit; and Equipped with The coil portion includes a first straight line portion (A1) inclined toward the other circumferential side as it extends toward the other axial side, a second straight line portion (A2) extending from the first straight line portion toward the other axial side, a third straight line portion (A3) inclined toward one circumferential side as it extends from the second straight line portion toward the other axial side, a fourth straight line portion (A4) inclined toward one circumferential side as it extends from the third straight line portion (A3) toward the one axial side, a fifth straight line portion (A5) extending from the fourth straight line portion toward the one axial side, and a sixth straight line portion (A6) inclined toward the other circumferential side as it extends from the fifth straight line portion toward the one axial side, each straight portion of the coil is divided in a direction intersecting the direction in which the straight portion of the coil extends, and one of the divided straight portions of the coil is one of the paths, and the other of the divided straight portions of the coil is another of the paths, The one path and the other path are arranged side by side in the circumferential direction, A coil body (32) in which one of the paths and another of the paths are connected by the first connection portion and the second connection portion, thereby forming a closed circuit in which one of the paths, another of the paths, the first connection portion, and the second connection portion are connected in a closed circuit shape.

2. 2. The coil body according to claim 1, wherein each of the coils has a plurality of turns, and the closed circuit is formed for each turn.

3. 2. The coil body according to claim 1, wherein each of the coils has a plurality of turns, and one closed circuit is formed for one of the coils.

4. The coil body according to claim 1 , wherein one closed circuit is formed for a plurality of the coils.

5. A coil body as described in claim 1, wherein the axial positions of the portions of each coil path that are folded back from one axial side to the other axial side are the same, and the axial positions of the portions of each coil path that are folded back from the other axial side to one side are the same.

6. The number of the coils constituting the same phase is 2n (n is a natural number), Counting the coils constituting the same phase in order from the other circumferential side to the one side, one end of the 2m-1th coil (m is a natural number that satisfies m≦n) is connected via the first connection portion (62), one end of the 2mth coil is connected via the second connection portion (64), and the other end of the 2m-1th coil and the other end of the 2mth coil are connected, 6. The coil body according to claim 5, wherein the closed circuit is formed to include two coils that constitute the same phase and are electrically continuous.

7. The number of the coils constituting the same phase is 2n+1 (n is a natural number), Counting the coils constituting the same phase in order from the other side to the one side in the circumferential direction, one end of the 2m-1th coil (m is a natural number that satisfies m≦n) is connected via the first connection part, one end of the 2mth coil is connected via the second connection part, and the other end of the 2m-1th coil and the other end of the 2mth coil are connected, In the 2m-1th to 2nth coils, the closed circuit is formed including two coils that constitute the same phase and are electrically continuous, 6. The coil body according to claim 5, wherein the closed circuit is formed by including the coils in one layer that is 2n+1th and the coils in another layer that is 2n+1th.

8. The belt member has a plurality of layers in the radial direction, A coil body as described in any one of claims 1 to 7, wherein the coil of a predetermined phase formed in one layer and the coil of a predetermined phase formed in another layer are radially stacked and arranged with a circumferential offset.

9. An armature (14) configured to include the coil body according to any one of claims 1 to 8.

10. One of a stator (14) and a rotor (12) comprising the armature of claim 9; the other of the stator and the rotor having a magnet (18) arranged radially opposite the coil body; A rotating electric machine (10, 68, 72, 82, 84) comprising the above.

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