Motor

Abstract

To provide an axial motor capable of achieving high efficiency.SOLUTION: A motor 100 includes a rotor 1 and a stator 30 facing the rotor 1 in a rotation axis direction, and the rotor 1 is obtained by including an annular magnetic body 10 having a plurality of air gaps 11A, 12A, and 13A arranged in the rotation axis direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Conventionally, an axial type motor in which a stator and a rotor are arranged facing each other in the axial direction can be made thin. For example, Patent Document 1 discloses an axial gap type motor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-174552 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the rotor of an axial motor has a complex shape, and is therefore made of a soft magnetic composite (SMC) material. However, because the magnetic permeability of a powdered iron core is low, when a rotor is formed using a powdered iron core, there are certain limitations on improving motor efficiency.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide an axial type motor that can achieve high efficiency. [Means for solving the problem]

[0006] A motor according to a representative embodiment of the present invention comprises a rotor and a stator facing the rotor in the direction of the rotation axis, the rotor comprising an annular magnetic body having a plurality of gaps aligned in the direction of the rotation axis. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a cross-sectional structure of a motor according to an embodiment of the present invention; [Figure 2] 1 is a perspective view showing the structure of an annular magnetic body and a stator of a motor according to an embodiment of the present invention; [Figure 3] FIG. 2 is a perspective view showing the structure of a ring-shaped magnetic body. [Figure 4] 1 is a diagram showing the structure of the outermost peripheral surface of an annular magnetic body as viewed from the outside in the circumferential direction. [Figure 5] FIG. 2 is a diagram showing the structure of the outermost surface of a ring-shaped magnetic body. [Figure 6] FIG. 10 is a diagram showing the structure of a ring-shaped magnetic body formed by winding when laid out on a plane. DETAILED DESCRIPTION OF THE INVENTION

[0008] First, a summary of a representative embodiment of the invention disclosed in this application will be described. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of elements may differ from the actual situation. The drawings may also include portions where the dimensional relationships and ratios differ from one another.

[0009] [Configuration of rotating machine] FIG. 1 is a perspective view showing a cross-sectional structure of a motor according to an embodiment of the present invention. As shown in FIG. 1, a motor 100 according to an embodiment of the present invention comprises a rotor 1, a stator 30 facing the rotor 1 in the direction of the rotation axis (hereinafter referred to as "shaft 40"), a first bearing 51 and a second bearing 52 supporting the shaft 40, a case 60, and a plate 70. The rotor 1 also includes an annular magnetic body 10 and a sleeve 20. In this embodiment, for convenience of explanation, the direction in which shaft 40 extends (longitudinal direction) is referred to as the rotational axis direction (Z-axis direction). The direction of rotation centered on the rotational axis direction (Z-axis direction) is referred to as the circumferential direction. Furthermore, the direction centered on the rotational axis direction (Z-axis direction) and away from shaft 40 in the XY plane is referred to as the radial direction.

[0010] Fig. 2 is a perspective view showing the structure of an annular magnetic body and a stator of a motor according to an embodiment of the present invention, and Fig. 3 is a perspective view showing the structure of the annular magnetic body. As shown in Figures 2 and 3, the annular magnetic body 10 is formed by winding a plate-shaped magnetic body 14 made of, for example, a silicon steel plate or soft electromagnetic iron in a circumferential direction, which is an example of a predetermined direction, as described below. The plate-shaped magnetic body 14 forming the annular magnetic body 10 has a plurality of voids 11A, 12A, and 13A arranged in the longitudinal direction of the shaft 40 (hereinafter referred to as the "rotation axis direction"), which are formed by a removal process such as punching, laser processing, or etching, as described below. The annular magnetic body 10 has a circular or approximately circular shape and includes a sleeve 20 disposed inside. A hole 10H surrounded by the inner periphery of the magnetic body 14 is provided at the center in the radial direction of the annular magnetic body 10. The sleeve 20 (see Figure 1) is inserted into the hole 10H. 1, the rotor 1 is disposed so as to face the stator 30 in the direction of the rotation axis. In other words, the motor 100 is an axial type motor.

[0011] The sleeve 20 is formed, for example, from a magnetic metal material or a non-magnetic metal material, and has a disk or approximately disk shape. The sleeve 20 has a hole 20H in the radial center, which is surrounded by the inner periphery of the sleeve 20. The shaft 40 is fitted into the hole 20H.

[0012] As shown in FIGS. 1 and 2, the stator 30 is composed of a magnetic body 31 and a coil 32. The magnetic body 31 is formed by stacking annular plate-shaped members such as electromagnetic steel plates in an axial direction, which is an example of a predetermined direction. The magnetic body 31 has a circular or approximately circular ring shape, and has a hole in the center in the radial direction, which is surrounded by the inner periphery of the magnetic body 31. The magnetic body 31 of the stator 30 has the same axis as the annular magnetic body 10 and the sleeve 20. The magnetic body 31 includes a base 31B that is an annular region, and magnetic pole portions 31P that are multiple convex regions that protrude from the base 31B in the rotation axis direction toward the annular magnetic body 10. Multiple coils 32 are wound around the multiple magnetic pole portions 31P.

[0013] The shaft 40 is made of, for example, a metal material and has a cylindrical or approximately cylindrical shape. The shaft 40 is fitted into the sleeve 20. Therefore, the annular magnetic body 10 and the sleeve 20 rotate integrally with the shaft 40 as the central axis.

[0014] 1, the first bearing 51 and the second bearing 52 are disposed on the outer side (direction away from the center) of the rotor 1 and the stator 30 in the axial direction. In other words, the rotor 1 and the stator 30 are disposed between the first bearing 51 and the second bearing 52 in the axial direction. The first bearing 51 and the second bearing 52 support the shaft 40 rotatably relative to the stator 30.

[0015] The first bearing 51 is one of a pair of bearings provided in the motor 100 and is provided on the stator 30 side of the shaft 40. The first bearing 51 is, for example, a ball bearing including an inner ring, an outer ring, and a plurality of rolling elements provided between the inner ring and the outer ring. The inner peripheral surface of the inner ring of the first bearing 51 is attached to the outer peripheral surface of a portion of the shaft 40 on one end side. The outer peripheral surface of the outer ring of the first bearing 51 is attached to a hole 61 provided on the lower surface (the stator 30 side) of the case 60. In addition to ball bearings, plain bearings can also be used for the first bearing 51 and the second bearing 52. In this case, bearings such as sintered oil-impregnated bearings, gas bearings, and magnetic bearings can be used.

[0016] The second bearing 52 is one of a pair of bearings provided in the motor 100 and is provided at the other end side of the shaft 40. The second bearing 52 is, for example, a ball bearing including an inner ring, an outer ring, and a plurality of rolling elements provided between the inner ring and the outer ring. The inner peripheral surface of the inner ring of the second bearing 52 is attached to the outer peripheral surface of the shaft 40. Furthermore, the outer peripheral surface of the outer ring of the second bearing 52 is attached to a hole 62 provided in the radial center of the plate 70.

[0017] Case 60 is made of, for example, a metal material and has a hollow cylindrical or approximately cylindrical shape. Rotor 1 and stator 30 are arranged in the inner space surrounded by case 60. A bottom with a hole is provided on the lower side (stator 30 side) of case 60, and a first bearing 51 is attached to this hole. An opening is formed on the upper side (rotor 1 side) of case 60, and a plate 70 is attached to cover this opening.

[0018] The plate 70 is made of, for example, a metal material and has a disk or approximately disk shape. The plate 70 is attached to the upper side (rotor 1 side) of the case 60. A hole is provided in the center of the plate 70 in the radial direction, and the second bearing 52 is attached to this hole.

[0019] [Configuration of annular magnetic body and stator] As shown in FIG. 2, the annular magnetic body 10 has a plurality of voids 11, 12, 13 aligned in the longitudinal direction of the shaft 40, which are formed by a removal process such as punching, laser processing, or etching.

[0020] The multiple gaps 11, 12, 13 are formed by a first gap 11C, a second gap 12C, and a third gap 13C, which extend in the circumferential direction, and a first gap 11A, a second gap 12A, and a third gap 13A, which extend in the rotation axis direction, respectively.

[0021] The first gap 11 includes a first gap 11C extending in the circumferential direction and a first gap 11A extending in the rotation axis direction. Of the gaps 11C, 12C, and 13C extending in the circumferential direction, the first gap 11C is located at a position farthest from the stator 30 in the direction of the rotation axis. The first gaps 11A extending in the rotation axis direction are formed so as to extend from both circumferential ends of the first gaps 11C extending in the circumferential direction toward the stator 30 in the rotation axis direction.

[0022] The second gap 12 includes a second gap 12C extending in the circumferential direction and a second gap 12A extending in the rotation axis direction. Of the gaps 11C, 12C, and 13C extending in the circumferential direction, the second gap 12C is located between the first gap 11C and the third gap 13C in the rotation axis direction. The second gaps 12A extending in the rotation axis direction are formed so as to extend from both circumferential ends of the second gaps 12C extending in the circumferential direction toward the stator 30 in the rotation axis direction.

[0023] The third gap 13 includes a third gap 13C extending in the circumferential direction and a third gap 13A extending in the rotation axis direction. Of the gaps 11C, 12C, and 13C extending in the circumferential direction, the third gap 13C is located closest to the stator 30 in the direction of the rotation axis. The third gaps 13A extending in the rotation axis direction are formed so as to extend from both circumferential ends of the third gaps 13C extending in the circumferential direction toward the stator 30 in the rotation axis direction.

[0024] The first gap 11A extending in the direction of the rotation axis, the second gap 12A extending in the direction of the rotation axis, and the third gap 13A extending in the direction of the rotation axis are aligned in the direction of the rotation axis. In addition, two second gaps 12A extending in the direction of the rotation axis are arranged between two first gaps 11A extending in the direction of the rotation axis, and two third gaps 13A extending in the direction of the rotation axis are arranged between two second gaps 12A extending in the direction of the rotation axis.

[0025] [Configuration of ring-shaped magnetic material] FIG. 4 is a diagram showing the structure of the outermost peripheral surface of the annular magnetic body when viewed from the outside in the circumferential direction. FIG. 5 is a diagram showing the structure of the outermost surface of the annular magnetic body. FIG. 6 is a diagram showing the structure of the annular magnetic body formed by winding when laid out on a plane.

[0026] As described above, the annular magnetic body 10 is formed by winding a plate-shaped magnetic body 14 made of, for example, silicon steel plate or soft electromagnetic iron a certain number of times in the circumferential direction, which is an example of a predetermined direction. In this embodiment, as shown in Figures 3 to 6, the annular magnetic body 10 is formed by winding the magnetic body 14 clockwise in the circumferential direction, for example, 15 times, starting from one end 16 of the plate-shaped magnetic body 14.

[0027] When one end 16 of the magnetic body 14 is compared with the other end 15 of the magnetic body 14 after winding the plate-shaped magnetic body 14, the one end 16 of the magnetic body 14 is located toward the center (inner periphery) in the radial direction, and the other end 15 of the magnetic body 14 is located toward the outer periphery in the radial direction. Furthermore, the one end 16 of the magnetic body 14 and the other end 15 of the magnetic body 14 are located at approximately the same position in the circumferential direction. Hereinafter, one end 16 of the magnetic body 14 will also be referred to as the innermost end 16 of the magnetic body 14, and the other end 15 of the magnetic body 14 will also be referred to as the outermost end 15 of the magnetic body 14.

[0028] As described above, the plate-shaped magnetic body 14 that forms the annular magnetic body 10 has multiple voids 11, 12, and 13 aligned in the direction of the rotation axis, which are formed by removal processing such as punching, laser processing, or etching.

[0029] As described above, the plurality of voids 11, 12, and 13 are formed by the first void 11C extending in the circumferential direction, the second void 12C extending in the circumferential direction, the third void 13C extending in the circumferential direction, the first void 11A extending in the rotational axis direction, the second void 12A extending in the rotational axis direction, and the third void 13A extending in the rotational axis direction. There are L sets of these voids 11C, 12C, 13C, 11A, 12A, and 13A arranged along the circumferential direction.

[0030] Specifically, the gaps 11C, 12C, 13C, 11A, 12A, and 13A are arranged at predetermined intervals in the circumferential direction from the innermost end 16 of the magnetic body 14 to the outermost end 15 of the magnetic body 14. In this embodiment, for the sake of simplicity, the gaps 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN may be designated as the first, second, third, ..., Nth, ..., Lth groups of gaps, counting from the innermost end 16 of the magnetic body 14. Furthermore, the voids 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN may be counted from the outermost end 15 of the magnetic body 14. In this case, the void located at the outermost end 15 of the magnetic body 14 is designated as the Tth void, and the voids may be designated by group as being located from there toward the innermost end 16 of the magnetic body 14 as the T1th group, the T2th group, the T3th group, ..., the TNth group, ..., the TLth group. In summary, each of the gaps 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN may be designated as the first, second, third, ..., Nth, ..., T3th, T2th, and T1th sets in the circumferential direction from the innermost end 16 of the magnetic body 14. However, for convenience of explanation, only some of the gaps 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN are shown in the drawings. Therefore, when specifying gaps not shown in the drawings, a distinguishing code B may be added to the end of the reference code to indicate that the gaps are not shown in the drawings, and the gaps may be specified as 11CNB, 12CNB, 13CNB, 11ANB, 12ANB, and 13ANB.

[0031] For example, on the outermost peripheral surface of the annular magnetic body 10 in Figures 3 and 4, the gap located in front is the T2th set of gaps counting from the outermost end 15 of the magnetic body 14, and these gaps are 11CT2, 12CT2, 13CT2, 11AT2, 12AT2, and 13AT2. Similarly, on the innermost peripheral surface of the annular magnetic body 10 in Figures 3 and 5, the gaps located at the front are the first set of gaps counting from the innermost peripheral end 16 of the magnetic body 14, and so these gaps are 11C1, 12C1, 13C1, 11A1, 12A1, and 13A1.

[0032] Next, the methods of expressing the widths of the gaps 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN in the circumferential direction and the rotation axis direction will be described.

[0033] The circumferential widths of the circumferentially extending gaps 11CN, 12CN, and 13CN are represented as WCN1 for gap 11CN, WCN2 for gap 12CN, and WCN3 for gap 13CN. For example, as shown in FIG. 6, the gap 11C1 is represented as WC11, the gap 12C1 as WC12, and the gap 13C1 as WC13. Also, for example, as shown in FIGS. 4 and 6, the gap 11CT2 is represented as WCT21, the gap 12CT2 as WCT22, and the gap 13CT2 as WCT23.

[0034] The circumferential widths of the gaps 11AN, 12AN, and 13AN extending in the rotation axis direction are represented as WAN1 for the gap 11AN, WAN2 for the gap 12AN, and WAN3 for the gap 13AN. For example, as shown in FIG. 4, the gap 11AT2 is represented as WAT21, the gap 12AT2 as WAT22, and the gap 13AT2 as WAT23. However, for ease of explanation, when specifying the width of a gap not shown in the drawings, the identification symbol B may be added to the end of the reference symbol to indicate that it is the width of a gap not shown in the drawings, and each gap may be specified as WCN1B, WCN2B, WCN3B, WAN1B, WAN2B, or WAN3B.

[0035] The width of each of the circumferentially extending gaps 11C, 12C, and 13C in the rotational axis direction is constant. More specifically, the width of each of the circumferentially extending gaps 11CN, 12CN, and 13CN in the rotational axis direction is constant, regardless of the circumferential position (Nth set). Therefore, as shown in FIG. 4, the gap 11CN is represented as TC1, the gap 12CN as TC2, and the gap 13CN as TC3.

[0036] Next, the numbers of voids 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN included in each turn when the magnetic body 14 is wound and their corresponding relationships will be described.

[0037] As described above, the annular magnetic body 10 is formed by winding the plate-shaped magnetic body 14 clockwise in the circumferential direction, starting from the innermost end 16 of the plate-shaped magnetic body 14. In this case, the portion of the magnetic body 14 corresponding to one circumference includes a plurality of voids 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN.

[0038] In this embodiment, four sets of air gaps 11C1, 12C1, 13C1, 11A1, 12A1, 13A1, 11C2, 12C2, 13C2, 11A2, 12A2, 13A2, 11C3, 12C3, 13C3, 11A3, 12A3, 13A3, 11C4B, 12C4B, 13C4B, 11A4B, 12A4B, and 13A4B (see FIGS. 3, 4, and 6). Note that for convenience of explanation, reference numerals for air gaps 11C2, 12C2, 13C2, 11A2, 12A2, 13A2, 11A3, 12A3, and 13A3 are omitted in FIG. 6. Furthermore, the portion corresponding to the outermost periphery of the magnetic body 14 includes four sets of gaps 11CT4B, 12CT4B, 13CT4B, 11AT4B, 12AT4B, 13AT4B, 11CT3, 12CT3, 13CT3, 11AT3, 12AT3, 13AT3, 11CT2, 12CT2, 13CT2, 11AT2, 12AT2, 13AT2, 11CT1, 12CT1, 13CT1, 11AT1, 12AT1, and 13AT1.

[0039] In this case, the gaps 11C1, 12C1, 13C1, 11A1, 12A1, and 13A1 and the gaps 11CT4B, 12CT4B, 13CT4B, 11AT4B, 12AT4B, and 13AT4B are aligned in the radial direction and are disposed at the same position in the circumferential direction. Furthermore, the gaps 11C2, 12C2, 13C2, 11A2, 12A2, and 13A2, and the gaps 11CT3, 12CT3, 13CT3, 11AT3, 12AT3, and 13AT3 are aligned in the radial direction and are disposed at the same position in the circumferential direction. Furthermore, the gaps 11C3, 12C3, 13C3, 11A3, 12A3, and 13A3, and the gaps 11CT2, 12CT2, 13CT2, 11AT2, 12AT2, and 13AT2 are aligned in the radial direction and are disposed at the same position in the circumferential direction. Furthermore, the gaps 11C4B, 12C4B, 13C4B, 11A4B, 12A4B, and 13A4B and the gaps 11CT1, 12CT1, 13CT1, 11AT1, 12AT1, and 13AT1 are aligned in the radial direction and are disposed at the same position in the circumferential direction.

[0040] Next, with regard to the magnetic body 14 wound around the annular magnetic body 10, how to represent the portion corresponding to one turn of the magnetic body 14 will be described.

[0041] As mentioned above, when the magnetic body 14 is wound clockwise in the circumferential direction starting from the innermost end 16 of the magnetic body 14, it is necessary to indicate which turn corresponds to which.

[0042] In this embodiment, for the sake of simplicity, when the innermost end 16 of the magnetic body 14 is taken as the starting point, the portions corresponding to the first, second, third, ..., Nth, ... turns counting from the innermost end 16 of the magnetic body 14 may be designated as the first region 141, the second region 142, the third region 143, ..., the Nth region 14N, ..., the Lth region 14L. Furthermore, when the outermost end 15 of the magnetic body 14 is used as the starting point, the portions corresponding to the T1 turn, T2 turn, T3 turn, ..., TN turn, ..., TL turn counting from the outermost end 15 of the magnetic body 14 may be designated as the first portion 14T1, the second portion 14T2, the third portion 14T3, ..., the Nth portion 14TN, ..., the Lth portion 14TL.

[0043] Next, the plurality of voids 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN included in the Nth region 14N and the Nth portion 14TN will be described.

[0044] The Nth region 14N and the Nth portion 14TN may include any number of pairs of voids 11CN, 12CN, 13CN, 11AN, 12AN, and 13AN.

[0045] In this embodiment, the Nth region 14N and the Nth portion 14TN include four pairs of voids.

[0046] For example, the first region 141 includes four sets of voids 11C1, 12C1, 13C1, 11A1, 12A1, 13A1, 11C2, 12C2, 13C2, 11A2, 12A2, 13A2, 11C3, 12C3, 13C3, 11A3, 12A3, 13A3, 11C4B, 12C4B, 13C4B, 11A4B, 12A4B, and 13A4B.

[0047] Also, for example, the first portion 14T1 includes four sets of voids 11CT4B, 12CT4B, 13CT4B, 11AT4B, 12AT4B, 13AT4B, 11CT3, 12CT3, 13CT3, 11AT3, 12AT3, 13AT3, 11CT2, 12CT2, 13CT2, 11AT2, 12AT2, 13AT2, 11CT1, 12CT1, 13CT1, 11AT1, 12AT1, 13AT1.

[0048] Next, the relationship between the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially extending gaps 11CN, 12CN, and 13CN will be described.

[0049] Comparing the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially extending gaps 11CN, 12CN, and 13CN, the width WCN1 of the first gap is the largest, followed by the width WCN2 of the second gap, and the width WCN3 of the third gap is the smallest.

[0050] For example, of the circumferential widths WC11, WC12, and WC13 of the first set of gaps 11C1, 12C1, and 13C1 counting from the innermost end 16 of the magnetic body 14, WC11 is the largest, WC12 is the next largest, and WC13 is the smallest.

[0051] Comparing the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially extending gaps 11CN, 12CN, and 13CN, the circumferential widths WC11, WC12, and WC13 of the first set of gaps 11C1, 12C1, and 13C1 counting from the innermost end 16 of the magnetic body 14 are the smallest.

[0052] In the circumferential direction, the circumferential widths WCN1, WCN2, WCN3 of the gaps 11CN, 12CN, 13CN increase toward the outermost end 15 of the magnetic body 14. As a result, the circumferential widths WCT11, WCT12, WCT13 of the first set of gaps 11CT1, 12CT1, 13CT1 counting from the outermost end 15 of the magnetic body 14 are the largest.

[0053] That is, in the magnetic body 14, when a first portion 14T1 forming the outermost peripheral surface of the annular magnetic body 10 is compared with a second portion 14T2 forming the outer peripheral surface facing the first portion 14T1 in the radial direction, widths WCT11, WCT12, WCT13, WCT21, WCT22, WCT23, WCT Widths WCT51B, WCT52B, WCT53B, WCT61B, WCT62B, WCT63B, WCT71B, WCT72B, WCT73B, WCT81B, WCT82B, WCT83B of gaps 11CT5B, 12CT5B, 13CT5B, 11CT6B, 12CT6B, 13CT6B, 11CT7B, 12CT7B, 13CT7B, 11CT8B, 12CT8B, 13CT8B of the second portion 14T2 are different.

[0054] Specifically, for the first portion 14T1 and the second portion 14T2 aligned radially, when the widths WCT11, WCT12, WCT13 of the gaps 11CT1, 12CT1, 13CT1 of the first portion 14T1 are compared with the widths WCT51B, WCT52B, WCT53B of the gaps 11CT5B, 12CT5B, 13CT5B of the second portion 14T2, the widths WCT11, WCT12, WCT13 are larger than the widths WCT51B, WCT52B, WCT53B.

[0055] Similarly, for the first portion 14T1 and the second portion 14T2 aligned radially, when the widths WCT21, WCT22, WCT23 of the gaps 11CT2, 12CT2, 13CT2 of the first portion 14T1 are compared with the widths WCT61B, WCT62B, WCT63B of the gaps 11CT6B, 12CT6B, 13CT6B of the second portion 14T2, the widths WCT21, WCT22, WCT23 are larger than the widths WCT61B, WCT62B, WCT63B.

[0056] Similarly, for the first portion 14T1 and the second portion 14T2 aligned radially, when the widths WCT31, WCT32, WCT33 of the gaps 11CT3, 12CT3, 13CT3 of the first portion 14T1 are compared with the widths WCT71B, WCT72B, WCT73B of the gaps 11CT7B, 12CT7B, 13CT7B of the second portion 14T2, WCT31, WCT32, WCT33 are larger than the widths WCT71B, WCT72B, WCT73B.

[0057] Similarly, for the first portion 14T1 and the second portion 14T2 aligned radially, when comparing the widths WCT41B, WCT42B, WCT43B of the gaps 11CT4B, 12CT4B, 13CT4B of the first portion 14T1 with the widths WCT81B, WCT82B, WCT83B of the gaps 11CT8B, 12CT8B, 13CT8B of the second portion 14T2, WCT41B, WCT42B, WCT43B are larger than the widths WCT81B, WCT82B, WCT83B.

[0058] Next, the relationship between the circumferential widths of the gaps 11AN, 12AN, and 13AN extending in the direction of the rotation axis will be described.

[0059] Comparing the circumferential widths WAN1, WAN2, and WAN3 of the gaps 11AN, 12AN, and 13AN extending in the direction of the rotation axis, the width WAN1 of the first gap is the largest, followed by the width WAN2 of the second gap, and the width WAN3 of the third gap is the smallest.

[0060] For example, as shown in FIG. 4, when comparing the circumferential widths WAT21, WAT22, and WAT23 of the gaps 11AT2, 12AT2, and 13AT2 extending in the direction of the rotation axis, the width WAT21 of the first gap is the largest, followed by the width WT22 of the second gap, and the width WT23 of the third gap is the smallest.

[0061] Next, the relationship between the widths of the circumferentially extending gaps 11CN, 12CN, and 13CN in the direction of the rotation axis will be described.

[0062] As described above, the widths TC1, TC2, and TC3 of the gaps 11CN, 12CN, and 13CN extending in the circumferential direction in the direction of the rotation axis each have a fixed size. As shown in FIG. 4, widths TC1, TC2, and TC3 of gaps 11CN, 12CN, and 13CN extending circumferentially in the rotation axis direction are different from each other.

[0063] The widths TC1, TC2, and TC3 of the circumferentially extending gaps 11CN, 12CN, and 13CN in the rotational axis direction become smaller toward the stator 30 side. Specifically, the width TC1 of the first gap in the rotational axis direction is the largest, the width TC2 of the second gap in the rotational axis direction is the next largest, and the width TC3 of the third gap in the rotational axis direction is the smallest.

[0064] As described above, the motor 100 according to the embodiment of the present invention comprises an annular magnetic body 10 and a stator 30 facing the annular magnetic body 10 in the direction of the rotation axis, and the annular magnetic body 10 comprises a plurality of gaps 11A, 12A, 13A aligned in the direction of the rotation axis.

[0065] According to this, the portion where the plurality of voids 11A, 12A, and 13A are provided has lower magnetic permeability compared to the surrounding magnetic body 14, and therefore the plurality of voids 11A, 12A, and 13A can control the magnetic flux of the annular magnetic body 10. For example, the plurality of voids 11A, 12A, and 13A can impart magnetic salience to the annular magnetic body 10. Therefore, it is possible to provide an axial type motor 100 that can achieve high efficiency.

[0066] In motor 100 according to the embodiment of the present invention, gaps 11, 12, and 13 extend in circumferential directions 11C, 12C, and 13C and in rotational axis directions 11A, 12A, and 13A.

[0067] This makes it possible to control the magnetic flux of the annular magnetic body 10 in the circumferential direction and the direction of the rotation axis.

[0068] In the motor 100 according to the embodiment of the present invention, the annular magnetic body 10 includes a magnetic body 14 wound around the circumference.

[0069] According to this, since the annular magnetic body 10 is formed by the magnetic body 14, the difference in magnetic permeability with the gaps 11, 12, and 13 can be increased, and the magnetic saliency given to the annular magnetic body 10 can be increased.

[0070] Furthermore, in the motor 100 according to the embodiment of the present invention, the magnetic body 14 includes a first portion 14T1 that forms the outermost peripheral surface of the annular magnetic body 10, and a second portion 14T2 that forms an outer peripheral surface that faces the first portion 14T1 in the radial direction. In the circumferential direction, widths WCT11, WCT12, WCT13, WCT21, WCT22, WCT23, WCT24, WCT25, WCT26, WCT27, WCT28, WCT29, WCT30, WCT31, WCT32, WCT33, WCT34, WCT35, WCT36, WCT37, WCT38, WCT39, WCT40, WCT41, WCT42, WCT43, WCT44, WCT45, WCT46, WCT47, WCT48, WCT49, WCT50, WCT51, WCT52, WCT53, WCT54, WCT55, WCT56, WCT57, WCT58, WCT59, WCT60, WCT61, WCT62, WCT63, WCT64, WCT65, WCT66, WCT67, WCT68, WCT69, WCT70, WCT71, WCT72, WCT73, WCT74, WCT75, WCT76, WCT77, WCT78, WCT79, WCT80, WCT81, WCT82, WCT83, WCT84, WCT85, WCT86, WCT87, WCT88, WCT89, WCT90, WCT91, WCT92, WCT93, WCT94, WCT95, WCT96, WCT97, WCT98, WCT99, WCT90, WCT91 Widths WCT51B, WCT52B, WCT53B, WCT61B, WCT62B, WCT63B, WCT71B, WCT72B, WCT73B, WCT81B, WCT82B, WCT83B of WCT23, WCT31, WCT32, WCT33, WCT41B, WCT42B, WCT43B and widths WCT51B, WCT52B, WCT53B, WCT61B, WCT62B, WCT63B, WCT71B, WCT72B, WCT73B, WCT81B, WCT82B, WCT83B of gaps 11CT5B, 12CT5B, 13CT5B, 11CT6B, 12CT6B, 13CT6B, 11CT7B, 12CT7B, 13CT7B, 11CT8B, 12CT8B, 13CT8B of second portion 14T2 are different.

[0071] This allows the circumferential widths WCN1, WCN2, WCN3 of the circumferentially extending gaps 11CN, 12CN, 13CN to be changed as one moves radially from the center to the outside, making it possible to adjust the magnetic flux passing through the annular magnetic body 10 in the circumferential direction.

[0072] In addition, in the motor 100 according to the embodiment of the present invention, the widths TC1, TC2, and TC3 of the multiple gaps 11CT1, 12CT1, 13CT1, 11CT2, 12CT2, 13CT2, 11CT3, 12CT3, 13CT3, 11CT4B, 12CT4B, and 13CT4B in the first portion 14T1 are different from each other in the direction of the rotation axis.

[0073] This allows the widths TC1, TC2, and TC3 of the circumferentially extending gaps 11CN, 12CN, and 13CN in the rotational axis direction to be changed, making it possible to adjust the magnetic flux passing through the annular magnetic body 10 in the rotational axis direction.

[0074] In motor 100 according to the embodiment of the present invention, multiple air gaps 11, 12, and 13 are flux barriers.

[0075] This makes it possible to easily adjust the direction of the magnetic flux passing through the annular magnetic body 10 by means of the flux barrier.

[0076] Furthermore, in the motor 100 according to the embodiment of the present invention, the stator 30 includes a magnetic body 31 and a plurality of coils 32, and the magnetic body 31 includes a plurality of magnetic pole portions 31P and a base 31B, and the plurality of coils 32 are wound around the plurality of magnetic pole portions 31P.

[0077] According to this, by winding a plurality of coils 32 around a plurality of magnetic pole portions 31P, the width of the stator 30 in the rotation axis direction can be reduced, and therefore the motor 100 can be made thinner.

[0078] The invention made by the inventor has been specifically described above based on an embodiment, but it goes without saying that the invention is not limited thereto and can be modified in various ways without departing from the spirit of the invention.

[0079] For example, with regard to the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially extending gaps 11CN, 12CN, and 13CN aligned in the rotation axis direction, the width WCN1 of the first gap is the largest, followed by the width WCN2 of the second gap, and the width WCN3 of the third gap is the smallest. However, it is also possible to have the width WCN1 of the first gap be the smallest, followed by the width WCN2 of the second gap, and the width WCN3 of the third gap be the largest.

[0080] Furthermore, for example, the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially extending gaps 11CN, 12CN, and 13CN aligned in the rotation axis direction may all be the same width.

[0081] Furthermore, for example, with respect to the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially aligned gaps 11CN, 12CN, and 13CN extending in the circumferential direction, the circumferential widths WC11, WC12, and WC13 of the first set of gaps 11C1, 12C1, and 13C1 counting from the innermost end 16 of the magnetic body 14 are the smallest, and the widths of the gaps 11CN, 12CN, and 13CN become smaller as they move toward the outermost end 15 of the magnetic body 14 in the circumferential direction. Although the circumferential widths WCN1, WCN2, and WCN3 are set to be large, it is also possible that the circumferential widths WC11, WC12, and WC13 of the first set of gaps 11C1, 12C1, and 13C1 counting from the innermost end 16 of the magnetic body 14 are the largest, and that the circumferential widths WCN1, WCN2, and WCN3 of the gaps 11CN, 12CN, and 13CN become smaller in the circumferential direction as they move toward the outermost end 15 of the magnetic body 14.

[0082] Furthermore, for example, with regard to the circumferential widths WCN1, WCN2, and WCN3 of the circumferentially aligned voids 11CN, 12CN, and 13CN extending in the circumferential direction, the circumferential widths WCN1, WCN2, and WCN3 of the circumferential gaps 11CN, 12CN, and 13CN may not change in size from the size of the circumferential widths WC11, WC12, and WC13 of the first set of voids 11C1, 12C1, and 13C1 counting from the innermost end 16 of the magnetic body 14 toward the outermost end 15 of the magnetic body 14, and may all be the same width.

[0083] Furthermore, for example, with regard to the circumferential widths WAN1, WAN2, and WAN3 of the gaps 11AN, 12AN, and 13AN extending in the direction of the rotation axis, the width WAN1 of the first gap is the largest, the width WAN2 of the second gap is the next largest, and the width WAN3 of the third gap is the smallest. However, the width WAN1 of the first gap may be the smallest, the width WAN2 of the second gap is the next smallest, and the width WAN3 of the third gap is the largest.

[0084] Furthermore, for example, the widths WAN1, WAN2, and WAN3 in the circumferential direction of the gaps 11AN, 12AN, and 13AN extending in the rotation axis direction may all be the same width.

[0085] Furthermore, for example, the widths TC1, TC2, and TC3 of the circumferentially extending gaps 11CN, 12CN, and 13CN in the direction of the rotational axis are set to become smaller toward the stator 30 side, but the widths TC1, TC2, and TC3 of the circumferentially extending gaps 11CN, 12CN, and 13CN in the direction of the rotational axis may also be set to become larger toward the stator 30 side.

[0086] Furthermore, for example, the widths TC1, TC2, and TC3 of the circumferentially extending gaps 11CN, 12CN, and 13CN in the rotational axis direction may all be the same width. [Explanation of symbols]

[0087] 1...rotor, 10...annular magnetic body, 11, 11AN, 11CN...first air gap, 12, 12AN, 12CN...second air gap, 13, 13AN, 13CN...third air gap, 14...magnetic body, 14N...Nth region, 14TN...Nth portion, 15...outermost peripheral end of magnetic body, 16...innermost peripheral end of magnetic body, 20...sleeve, 30...stator, 31...magnetic body, 31B...base, 31P...magnetic pole portion, 32...coil, 40...rotating shaft, 51...first bearing, 52...second bearing, 60...case, 70...plate, 100...motor, TC1, TC2, TC3...width of circumferentially extending air gap in the rotational axis direction, WCN1, WCN2, WCN3...circumferential width of circumferentially extending air gap, WAN1, WAN2, WAN3...circumferential width of circumferentially extending air gap in the rotational axis direction

Claims

1. A rotor, a stator facing the rotor in the direction of the rotation axis; Equipped with The rotor includes an annular magnetic body having a plurality of gaps arranged in the direction of the rotation axis. Motor.

2. The gap extends in the circumferential direction and the rotation axis direction. The motor according to claim 1 .

3. The annular magnetic body includes a magnetic body wound in a circumferential direction.

3. The motor according to claim 1 or 2.

4. the annular magnetic body includes a first portion forming an outermost peripheral surface and a second portion forming an outer peripheral surface facing the first portion in a radial direction, In the circumferential direction, the width of the gap in the first portion is different from the width of the gap in the second portion. The motor according to claim 3.

5. In the rotation axis direction, widths of the plurality of gaps in the first portion are different from each other.

5. The motor according to claim 4.

6. the plurality of voids are flux barriers; 3. The motor according to claim 1 or 2.

7. the stator includes a magnetic body and a plurality of coils; the magnetic body includes a plurality of magnetic pole portions and a base, The plurality of coils are wound around the plurality of magnetic pole portions.

3. The motor according to claim 1 or 2.

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