Stator core, stator core member, stator and motor

Abstract

This stator core is provided with an annular ring core and a plurality of teeth. The plurality of teeth are each configured so as to be surrounded by a coil. At least one of the plurality of teeth includes a plurality of single layer teeth. The plurality of single layer teeth are overlapped with each other in the axial direction of the ring core. The stator core is provided with a plurality of divided cores. The plurality of divided cores include a first divided core and a second divided core. A target tooth of the plurality of single layer teeth is formed in such a way that the first divided core and the second divided core are connected to each other in the circumferential direction of the ring core.

Description

[Technical Field]

[0001] The present disclosure generally relates to a stator core, a stator core member, a stator, and a motor. More particularly, the present disclosure relates to a stator core including a plurality of split cores, a stator core member used in the stator core, and a stator and a motor including the stator core. [Background technology]

[0002] The brushless motor described in Patent Document 1 includes a stator core and a rotor. The stator core has a cylindrical yoke portion (ring core) and teeth portions that protrude from the inner circumferential surface of the yoke portion.

[0003] The stator core as described in Patent Document 1 is manufactured by assembling a plurality of split cores, for example. Therefore, there has been a demand for an improvement in the ease of assembly of the stator core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-086579 Summary of the Invention

[0005] The present disclosure aims to facilitate the assembly of a stator core.

[0006] A stator core according to one aspect of the present disclosure includes an annular ring core and a plurality of teeth. The plurality of teeth protrude from the ring core in a radial direction of the ring core. Each of the plurality of teeth is configured to be surrounded by a coil. At least one of the plurality of teeth includes a plurality of single-layer teeth. The plurality of single-layer teeth overlap each other in the axial direction of the ring core. The stator core includes a plurality of split cores. The plurality of split cores include a first split core and a second split core. The first split core and the second split core each have a portion of a target tooth among the plurality of single-layer teeth. The target tooth is formed by joining the first split core and the second split core to each other in the circumferential direction of the ring core.

[0007] A stator core member according to one aspect of the present disclosure is used as one of the divided cores in the stator core.

[0008] A stator according to one aspect of the present disclosure includes the stator core, and the stator includes a plurality of the coils.

[0009] A motor according to one aspect of the present disclosure includes a stator and a rotor, the rotor being disposed radially inside or outside the ring core with respect to the plurality of teeth, and the rotor rotating relative to the stator core.

[0010] The present disclosure has the advantage of facilitating assembly of the stator core. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a motor according to one embodiment. [Figure 2] FIG. 2 is an exploded view of a main part of the stator of the motor. [Figure 3] FIG. 3 is a plan view showing the assembled state of the stator of the same. [Figure 4]FIG. 4 is a diagram showing an assembly process of the stator of the same. [Figure 5] FIG. 5 is a diagram showing an assembly process of the stator of the same. [Figure 6] FIG. 6 is a diagram showing an assembly process of the stator of the same. [Figure 7] FIG. 7 is a diagram showing an assembly process of the stator of the same. [Figure 8] FIG. 8 is a diagram showing an assembly process of the stator of the same. [Figure 9] FIG. 9 is a plan view of a stator core of a stator according to a comparative example. [Figure 10] FIG. 10 is an exploded view of a main part of a stator core according to the first modification. [Figure 11] FIG. 11 is an exploded view of a main part of a stator core according to the second modification. [Figure 12] FIG. 12 is a perspective view of a main part of a stator core according to the third modification. [Figure 13] FIG. 13 is a perspective view of a main part of a stator core according to the fourth modification. [Figure 14A] FIG. 14A is a plan view of a main part of a stator core according to another modified example. [Figure 14B] FIG. 14B is a plan view of a main part of another stator core according to another modified example. [Figure 14C] FIG. 14C is a plan view of a main part of still another stator core according to another modified example. [Figure 14D] FIG. 14D is a plan view of a main portion of still another stator core according to another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] (Embodiment) The stator core 2, stator core member, stator 1, and motor M1 according to the embodiment will be described below with reference to the drawings. However, the embodiment described below is merely one of various embodiments of the present disclosure. The embodiment described below can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Furthermore, each figure described in the embodiment described below is a schematic diagram, and the ratios of the sizes and thicknesses of the components in the figures do not necessarily reflect the actual dimensional ratios.

[0013] (1) Overview FIG. 1 is a perspective view of a motor M1 according to one embodiment. FIG. 2 is an exploded view of a main portion of a stator 1 of the motor M1. FIG. 3 is a plan view showing the stator 1 in an assembled state. As shown in FIG. 1, the stator 1 of this embodiment includes a stator core 2. Furthermore, the stator 1 includes a plurality of coils 7.

[0014] The stator core 2 includes an annular ring core R1 and a plurality of teeth T1 (18 in FIG. 1). The teeth T1 protrude from the ring core R1 in the radial direction of the ring core R1. The teeth T1 are arranged in a line in the circumferential direction of the ring core R1. Each of the teeth T1 is configured to be surrounded by a coil 7. At least one of the teeth T1 includes a plurality of single-layer teeth ST1. The single-layer teeth ST1 overlap each other in the axial direction of the ring core R1. The stator core 2 includes a plurality of split cores (first to third split cores 4, 5, 6). The split cores include a first split core 4 and a second split core 5. The first split core 4 and the second split core 5 each include a portion of a corresponding tooth among the plurality of single-layer teeth ST1. The corresponding tooth is formed by joining the first split core 4 and the second split core 5 to each other in the circumferential direction of the ring core R1.

[0015] The stator core member is used as one of the divided cores (first divided core 4, second divided core 5 or third divided core 6) in the stator core 2.

[0016] According to this embodiment, the target teeth are divided into the first divided core 4 and the second divided core 5, which makes it easier to assemble the stator core 2 compared to when the target teeth are made up of a single member.

[0017] (2) Motor In this embodiment, the stator 1 is used in a motor M1 as an example. The stator 1 may also be used in a generator.

[0018] The motor M1 includes a stator 1 and a rotor 8. The stator core 2 is made of a magnetic material. The rotor 8 is disposed radially inside the ring core R1 with respect to the plurality of teeth T1. The rotor 8 rotates relative to the stator core 2.

[0019] The rotor 8 has a rotor core 81, a rotating shaft 82, and a plurality of permanent magnets 83. The rotor core 81 is made of a magnetic material. The rotor core 81 has a cylindrical shape. The rotor core 81 has a first through hole at its center, through which the rotating shaft 82 passes. The rotor core 81 also has a plurality of second through holes around the first through hole, into which the plurality of permanent magnets 83 are inserted. The rotor 8 has four permanent magnets 83 (only three are shown in FIG. 1 ). The four permanent magnets 83 are arranged in a square shape when viewed from the axial direction of the rotating shaft 82. Magnetic flux generated from the plurality of coils 7 of the stator 1 acts on the plurality of permanent magnets 83, causing the rotor 8 to rotate relative to the stator 1.

[0020] (3) Multiple blocks The stator core 2 has a plurality of blocks 3. In this embodiment, the number of blocks 3 is an even number. More specifically, the number of blocks 3 is two. That is, the stator core 2 has a first block 3A and a second block 3B as the plurality of blocks 3. Each of the plurality of blocks 3 includes an annular single-layer ring core SR1 and a plurality of (18 in FIG. 1 ) single-layer teeth ST1. The plurality of single-layer teeth ST1 protrude from the single-layer ring core SR1 in the radial direction of the single-layer ring core SR1.

[0021] The ring core R1 and the teeth T1 are formed by stacking the blocks 3 in the axial direction of the single-layer ring core SR1. That is, the single-layer ring cores SR1 of each block 3 are stacked in that direction to form the ring core R1. The single-layer teeth ST1 of each block 3 correspond one-to-one to the single-layer teeth ST1 of the other blocks 3. The corresponding single-layer teeth ST1 are stacked in the axial direction of the single-layer ring core SR1 to form the teeth T1. One tooth T1 includes one single-layer tooth ST1 from each block 3 (i.e., one single-layer tooth ST1 from the first block 3A and one single-layer tooth ST1 from the second block 3B). Each of the blocks 3 includes a plurality of divided cores (first to third divided cores 4, 5, 6).

[0022] When viewed in the axial direction of the single-layer ring core SR1, the second block 3B of the stator core 2 has the same shape as the first block 3A. The second block 3B has the same structure as the first block 3A. The "same structure" includes a configuration in which the dimensions of each part when viewed in the axial direction of the single-layer ring core SR1 are the same. The "same structure" also includes a configuration in which the shapes of each part when viewed in the axial direction of the single-layer ring core SR1 are slightly different. For example, the "same structure" includes a configuration in which the shapes that contribute to the connection of multiple divided cores are different. The "same structure" includes a configuration in which the dimensions of each part in the axial direction of the single-layer ring core SR1 are the same as those of the first block 3A. In this disclosure, "same" does not necessarily mean "strickenly the same" but also includes a configuration in which the dimensions are different within an allowable error range.

[0023] The second block 3B overlaps the first block 3A with a rotation angle shifted relative to the first block 3A. Specifically, the second block 3B overlaps the first block 3A so that the set of the first divided core 4 and the second divided core 5 of one block 3 and the third divided core 6 of the other block 3 are aligned in the axial direction of the single-layer ring core SR1.

[0024] (4) Ring core In multiple blocks 3, the single-layer ring cores SR1 are stacked in the axial direction of the single-layer ring core SR1 to form an annular ring core R1. The axial direction of the single-layer ring core SR1 coincides with the axial direction of the ring core R1. The radial direction of the single-layer ring core SR1 coincides with the radial direction of the ring core R1. The circumferential direction of the single-layer ring core SR1 coincides with the circumferential direction of the ring core R1. Multiple single-layer teeth ST1 are connected to the inner edge of the single-layer ring core SR1 and are lined up in the circumferential direction of the single-layer ring core SR1. Multiple teeth T1 are connected to the inner edge of the ring core R1 and are lined up in the circumferential direction of the ring core R1.

[0025] (5) Teeth In the multiple blocks 3, the multiple single-layer teeth ST1 are stacked in the axial direction of the single-layer ring core SR1 to form teeth T1. That is, the multiple single-layer teeth ST1 in the first block 3A correspond one-to-one to the multiple single-layer teeth ST1 in the second block 3B, and two corresponding single-layer teeth ST1 are stacked to form teeth T1. In the stator core 2, the same number of teeth T1 as the number of single-layer teeth ST1 in each block 3 (18 in this embodiment) are formed.

[0026] (6) Coil Each tooth T1 is surrounded by a coil 7. That is, the stator 1 has the same number of coils 7 as the number of teeth T1 (18 in this embodiment). The teeth T1 correspond one-to-one to the coils 7, and each tooth T1 is surrounded by a corresponding coil 7. However, only six of the 18 coils 7 are shown in FIG. 1, and the remaining coils 7 are not shown.

[0027] Each of the multiple coils 7 is a formed coil. A formed coil is a coil that is formed in advance into a shape that surrounds an object. In this respect, a formed coil differs from a coil that is formed by winding a linear conductor around an object. In this embodiment, the object surrounded by the formed coil is the tooth T1.

[0028] Each coil 7 includes a conductor and an electrically insulating coating covering the surface of the conductor. Each coil 7 is formed by stacking plate-shaped conductors in a spiral shape. When viewed from the radial direction of the ring core R1, the outer and inner edges of each coil 7 are rectangular. Each coil 7 has terminals 71, 72 (see FIG. 2) at both ends for electrically connecting to another coil 7 or a power source.

[0029] (7) Split core The configuration of the plurality of blocks 3 will be described in more detail below.

[0030] Each block 3 includes a plurality of divided cores (first to third divided cores 4, 5, 6). Each block 3 is formed by joining a plurality of divided cores together. More specifically, each block 3 is formed by joining a plurality of divided cores together in the circumferential direction of the single-layer ring core SR1.

[0031] Each of the multiple split cores is a laminated steel plate. That is, each of the multiple split cores includes multiple steel plates, which are laminated. The multiple split cores are connected to each other in the circumferential direction of the single-layer ring core SR1. The multiple split cores include multiple first split cores 4, multiple second split cores 5, and multiple third split cores 6. Each block 3 includes the same number of first split cores 4, second split cores 5, and third split cores 6 (9 in this embodiment). Each block 3 is formed by multiple first split cores 4, multiple second split cores 5, and multiple third split cores 6 that are periodically arranged in the circumferential direction of the single-layer ring core SR1 and connected to each other in that direction. More specifically, each block 3 is formed by repeating the order of the first split cores 4, second split cores 5, and third split cores 6 multiple times.

[0032] Of the first block 3A and the second block 3B, the structure of the first block 3A will be described below. As described above, in this embodiment, the second block 3B has the same structure as the first block 3A, so the description of the structure of the first block 3A also applies to the second block 3B. Therefore, the description of the structure of the second block 3B will be omitted as appropriate.

[0033] Each of the divided cores (first to third divided cores 4, 5, 6) has a length from one end of the single-layer tooth ST1 opposite the single-layer ring core SR1 side to the end of the single-layer ring core SR1 opposite the single-layer tooth ST1 side (outside).

[0034] Each of a portion (9 pieces) of the single-layer teeth ST1 (target teeth) of the multiple single-layer teeth ST1 of the first block 3A is composed of one first divided core 4 and one second divided core 5. Each of the remaining (9 pieces) of the multiple single-layer teeth ST1 of the first block 3A is composed of one third divided core 6.

[0035] The plurality of third divided cores 6 in the first block 3A constitute half of the even number of single-layer teeth ST1 and at least a part of the single-layer ring core SR1. The plurality of first divided cores 4 and the plurality of second divided cores 5 in the first block 3A constitute the remaining half of the single-layer teeth ST1 that are not formed by the plurality of third divided cores 6 and at least a part of the single-layer ring core SR1.

[0036] The single-layer ring core SR1 is configured as follows. The multiple first divided cores 4 and multiple second divided cores 5 of the first block 3A constitute the entire region of the single-layer ring core SR1 that is not connected to the multiple single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1). The region of the single-layer ring core SR1 that is connected to half of the single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1) is constituted by the multiple first divided cores 4 and multiple second divided cores 5. The region that is connected to the remaining half of the single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1) is constituted by the multiple third divided cores 6.

[0037] Each of the multiple single-layer teeth ST1 includes a coil arrangement portion T11 and a wide portion T12. Therefore, the single-layer tooth ST1 (target tooth) formed by the first divided core 4 and the second divided core 5 also includes the coil arrangement portion T11 and the wide portion T12. The coil arrangement portion T11 is surrounded by the coil 7. The wide portion T12 is located on the opposite side of the coil arrangement portion T11 from the ring core R1 side. More specifically, the wide portion T12 is located at the end of the single-layer tooth ST1 opposite to the ring core R1 side. In the circumferential direction of the ring core R1, the wide portion T12 is wider than the coil arrangement portion T11.

[0038] In this way, the single-layer tooth ST1 extends to both sides of the ring core R1 in the circumferential direction at the wide portion T12. In other words, the single-layer tooth ST1 has two protrusions T120 at the end opposite to the ring core R1, each having a length along the circumferential direction of the ring core R1.

[0039] Each protrusion T120 constitutes a part of a magnetic path through which magnetic flux passes between the rotor 8 and the stator 1. Therefore, compared to a case where the protrusions T120 (wide portions T12) are not provided, the magnetic efficiency of the motor M1 can be improved, and the output torque of the motor M1 can be increased.

[0040] The first divided core 4 has a portion of the coil arrangement portion T11, a portion of the wide portion T12, and a portion of the ring core R1 (single-layer ring core SR1). The second divided core 5 has another portion of the coil arrangement portion T11, another portion of the wide portion T12, and another portion of the ring core R1 (single-layer ring core SR1). When the first divided core 4 and the second divided core 5 are separated, each of the coil arrangement portion T11 and the wide portion T12 is separated along a center line having a length in the radial direction of the ring core R1. In other words, at this time, each of the coil arrangement portion T11 and the wide portion T12 is essentially divided into two equal parts.

[0041] 2, the first divided core 4 has a protrusion 41 and a recess 42 as a positioning structure 40 for positioning the second divided core 5. The first divided core 4 has a protrusion 43 as a positioning structure 40 for positioning the third divided core 6.

[0042] The second divided core 5 has a recess 51 and a protrusion 52 as a positioning structure 50 for positioning the first divided core 4. The second divided core 5 also has a protrusion 53 as a positioning structure 50 for positioning the third divided core 6.

[0043] The third divided core 6 includes a coil placement portion T11 and a wide portion T12. The third divided core 6 also has a recess 61 as a positioning structure 60 for positioning the first divided core 4. The third divided core 6 also has a recess 62 as a positioning structure 60 for positioning the second divided core 5.

[0044] In this manner, at least one (in this embodiment, all) of the multiple divided cores (first to third divided cores 4, 5, 6) has a positioning structure 40 (or 50, 60) that positions adjacent divided cores. The positioning structures 40, 50, 60 position the multiple divided cores that belong to the same block 3.

[0045] Figure 4 ~Figure 8 is the stator 1 10 is a diagram showing the assembly process of the above.

[0046] The convex portion 41 of the first divided core 4 fits into the concave portion 51 of the second divided core 5. The concave portion 42 of the first divided core 4 fits into the convex portion 52 of the second divided core 5. This positions the first divided core 4 and the second divided core 5 relative to each other. This joins the first divided core 4 and the second divided core 5 to each other. More specifically, the first divided core 4 and the second divided core 5 are joined by aligning the convex portion 41 and the concave portion 51 in the axial direction of the single-layer ring core SR1 (see FIG. 5), aligning the concave portion 42 and the convex portion 52 in the same direction (see FIG. 5), and then moving the first divided core 4 or the second divided core 5 in the same direction (see FIG. 6).

[0047] The protrusions 43 of the first divided core 4 fit into the recesses 61 of the third divided core 6. This positions the first divided core 4 and the third divided core 6 relative to each other.

[0048] The convex portion 53 of the second divided core 5 fits into the concave portion 62 of the third divided core 6. This positions the second divided core 5 and the third divided core 6 relative to each other.

[0049] The engagement of the convex and concave portions of each positioning structure 40 (or 50, 60) does not entail deformation of the divided cores (first to third divided cores 4, 5, 6), thereby reducing the possibility of a decrease in the magnetic efficiency of the motor M1 due to deformation of the divided cores.

[0050] The first block 3A and the second block 3B are assembled together, and the first divided core 4, the second divided core 5, and the third divided core 6 of each of the first block 3A and the second block 3B are positioned relative to each other. Thereafter, the first divided core 4, the second divided core 5, and the third divided core 6 are integrated in an integration process. In the integration process, the first divided core 4, the second divided core 5, and the third divided core 6 are molded with a molding material such as resin.

[0051] The stator core 2 has jig receiving portions 21 and 22 (see FIG. 3) on which a positioning jig 9 (see FIG. 3) is placed. The stator core 2 of this embodiment has a plurality of jig receiving portions (18 in FIG. 3). More specifically, the jig receiving portion 21 or 22 is provided in each region of the single-layer ring core SR1 that is connected to a plurality of single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1). In other words, each single-layer tooth ST1 and its corresponding jig receiving portion 21 or 22 are aligned in the radial direction of the single-layer ring core SR1. The jig receiving portions 21 and 22 are recesses provided on the outer peripheral surface of the single-layer ring core SR1.

[0052] As shown in FIG. 2, the third divided core 6 has a jig receiving portion 22.

[0053] The first divided core 4 has a notch 210. The second divided core 5 has a notch 211. When the first divided core 4 and the second divided core 5 are joined together, the notch 210 and the notch 211 are connected to form the jig receiving portion 21. In other words, the first divided core 4 and the second divided core 5 are joined together in the circumferential direction of the single-layer ring core SR1 to form the jig receiving portion 21.

[0054] The positioning jig 9 has at least a contact portion 92. The contact portion 92 is a portion that comes into contact with the jig receiving portion 21 or 22. In the example shown in FIG. 3, the jig 9 has a plurality of contact portions 92 (18 in FIG. 3) and a frame portion 91. The frame portion 91 is cylindrical in shape. The plurality of contact portions 92 protrude from the inner edge of the frame portion 91. The plurality of jig receiving portions 21, 22 correspond one-to-one to the plurality of contact portions 92, and each of the jig receiving portions 21, 22 comes into contact with the corresponding contact portion 92. This positions the plurality of split cores (first to third split cores 4, 5, 6).

[0055] (8) Relationship between Block 1 and Block 2 As described above, the second block 3B has the same structure as the first block 3A. Therefore, the second block 3B includes a plurality of first divided cores 4, a plurality of second divided cores 5, and a plurality of third divided cores 6. The first divided cores 4 and the second divided cores 5 are connected to each other in the circumferential direction of the single-layer ring core SR1 to form one target tooth among the multiple single-layer teeth ST1 of the second block 3B. Each third divided core 6 forms one single-layer tooth ST1 other than the target tooth among the multiple single-layer teeth ST1. The second block 3B is formed by periodically arranging a plurality of first divided cores 4, a plurality of second divided cores 5, and a plurality of third divided cores 6 in the circumferential direction of the single-layer ring core SR1 and connecting each other in that direction.

[0056] 1, the plurality of third divided cores 6 in the second block 3B correspond one-to-one to the sets of the plurality of first divided cores 4 and the plurality of second divided cores 5 in the first block 3A, and are stacked in the axial direction of the single-layer ring core SR1 with the corresponding first divided cores 4 and second divided cores 5. Furthermore, the plurality of first divided cores 4 and second divided cores 5 in the second block 3B correspond one-to-one to the plurality of third divided cores 6 in the first block 3A, and are stacked in the axial direction of the single-layer ring core SR1 with the corresponding third divided cores 6.

[0057] The stator core 2 includes a plurality of first units U1 (see FIG. 8) and a plurality of second units U2 (see FIG. 8). Each of the plurality of first units U1 includes a first divided core 4 and a second divided core 5 of the first block 3A, a third divided core 6 of the second block 3B, and a coil 7. Each of the plurality of second units U2 includes a third divided core 6 of the first block 3A, a first divided core 4 and a second divided core 5 of the second block 3B, and a coil 7. In the stator core 2, the first units U1 and the second units U2 are arranged alternately in the circumferential direction of the single-layer ring core SR1 and are connected to each other in that direction.

[0058] The first divided cores 4 and second divided cores 5 of the multiple first units U1 face the third divided cores 6 of the multiple second units U2 in the circumferential direction of the ring core R1. The third divided cores 6 of the multiple first units U1 face the first divided cores 4 and second divided cores 5 of the multiple second units U2 in the circumferential direction of the ring core R1.

[0059] Furthermore, the first divided cores 4 and second divided cores 5 of the multiple first units U1 are coupled to the third divided cores 6 of the multiple second units U2. The third divided cores 6 of the multiple first units U1 are coupled to the first divided cores 4 and second divided cores 5 of the multiple second units U2.

[0060] As shown in FIG. 8, in the axial direction of the ring core R1, the length H1 of the coil arrangement portion T11 of the tooth T1 is shorter than the length H2 of the cavity of the coil 7. The length H1 is equal to the sum of the length of the first divided core 4 (or the second divided core 5) of the first block 3A and the length of the third divided core 6 of the second block 3B in the same direction. The length H1 is equal to the sum of the length of the third divided core 6 of the first block 3A and the length of the first divided core 4 (or the second divided core 5) of the second block 3B in the same direction. The lengths H3 of the single-layer teeth ST1 in the length H1 direction are equal to each other. The length H3 of the single-layer teeth ST1 in the length H1 direction matches the length of each divided core in that direction.

[0061] In the direction along the circumferential direction of the single-layer ring core SR1, the length W1 of the coil arrangement portion T11 of the single-layer tooth ST1 (tooth T1) is shorter than the length W2 of the cavity of the coil .

[0062] Further, the shape of the coil arrangement portion T11 of the single-layer tooth ST1 in a cross section including the length H1 direction and the length W1 direction is rectangular.

[0063] (9) Assembly process Next, an example of an assembly process for the stator core 2 will be described with reference to Figures 4 to 8 and 3. Hereinafter, the portion of the first split core 4 that constitutes a portion of the single-layer tooth ST1 will be referred to as the split tooth 4t, and the portion of the first split core 4 that constitutes a portion of the single-layer ring core SR1 will be referred to as the split ring core 4r. The portion of the second split core 5 that constitutes a portion of the single-layer tooth ST1 will be referred to as the split tooth 5t, and the portion of the second split core 5 that constitutes a portion of the single-layer ring core SR1 will be referred to as the split ring core 5r. The portion of the third split core 6 that constitutes the single-layer tooth ST1 will be referred to as the split tooth 6t, and the portion of the third split core 6 that constitutes a portion of the single-layer ring core SR1 will be referred to as the split ring core 6r.

[0064] First, as shown in Fig. 4, the split teeth 5t of the second split core 5 are inserted inside the coil 7. Inside the coil 7, the split teeth 5t occupy a length that is shorter than half the length H2 of the cavity of the coil 7. In the height direction (length H3 direction), a space longer than the length H3 of the first split core 4 (split teeth 4t) is left between the inner edge of the coil 7 and the split teeth 5t.

[0065] Next, as shown in Fig. 5, the split teeth 4t of the first split core 4 are inserted inside the coil 7. Here, it is not possible to insert the split teeth 4t from the same height as the second split core 5 because the convex portions 41 of the split teeth 4t and the protrusions T120 (see Fig. 4) at the ends of the split teeth 4t would interfere with the second split core 5. Therefore, as shown in Fig. 5, the split teeth 4t are inserted from a different height than the second split core 5.

[0066] 6, the first divided core 4 is moved to the same height as the second divided core 5. At this time, the convex portion 41 of the first divided core 4 is fitted into the concave portion 51 of the second divided core 5, and the concave portion 42 of the first divided core 4 is fitted into the convex portion 52 of the second divided core 5.

[0067] Next, as shown in FIG. 7, the split teeth 6t of the third split core 6 are inserted inside the coil 7. Here, the side of the third split core 6 that does not have the two protrusions T120 (see FIG. 6) (the split ring core 6r side) is inserted inside the coil 7 first. Also, here, the third split core 6 is inserted from a different height than the first split core 4 and the second split core 5. In other words, the third split core 6 is inserted into the gap that exists between the first split core 4 and the second split core 5 and the inner edge of the coil 7 in the length H3 direction.

[0068] Through the above steps, the first split core 4, the second split core 5, and the third split core 6 can be inserted inside the coil 7. The structure formed through the above steps is referred to as the first unit U1. Note that in the process of forming the first unit U1, the split tooth 4t of the first split core 4 may be inserted inside the coil 7 first, and then the split tooth 5t of the second split core 5 may be inserted inside the coil 7.

[0069] By performing the above steps for each of the multiple coils 7, multiple first units U1 and second units U2 are formed as shown in FIG. 8. Each of the first unit U1 and the second unit U2 includes a coil 7. The first unit U1 and the second unit U2 have the same number of first units U1 and second units U2. In the first unit U1, the first divided core 4 and the second divided core 5 are arranged in the upper tier (one side in the height H1 direction), and the third divided core 6 is arranged in the lower tier (the other side in the height H1 direction). In the second unit U2, the first divided core 4 and the second divided core 5 are arranged in the lower tier, and the third divided core 6 is arranged in the upper tier. In other words, each of the first unit U1 and the second unit U2 has alternating first-type tiers (tiers where the first divided cores 4 and the second divided cores 5 are arranged) and second-type tiers (tiers where the third divided cores 6 are arranged). The first unit U1 has a first-type tier at the top tier, and the second unit U2 has a second-type tier at the top tier.

[0070] Each first unit U1 and two adjacent second units U2 are connected to each other at each divided core (first to third divided cores 4, 5, 6). As a result, all of the first units U1 and second units U2 are connected in an annular shape to form the stator core 2. As shown in FIG. 3, the divided cores (first to third divided cores 4, 5, 6) are positioned using a jig 9.

[0071] The multiple split cores are integrated in an integration process. In the integration process, the multiple split cores are integrated by welding, such as laser welding or TIG (Tungsten Inert Gas) welding. Alternatively, in the integration process, the multiple split cores are integrated by press-fitting the multiple split cores into the frame of the motor M1 so that the frame covers the multiple split cores from the axial direction (of the single-layer ring core SR1). Alternatively, in the integration process, the multiple split cores are integrated by molding the multiple split cores with resin. Alternatively, the multiple split cores are integrated by bonding the multiple split cores with an adhesive. Note that the integration process may be omitted, and the multiple split cores may be supported by the contact pressure generated between them.

[0072] Through the above steps, the stator core 2 is formed.

[0073] (10) Advantages FIG. 9 illustrates a stator core 2P according to a comparative example. Each block 3 of the stator core 2P includes a single-layer ring core SR1 and a plurality of single-layer teeth ST1. The single-layer ring core SR1 is formed from a single member. Each single-layer tooth ST1 is also formed from a single member. The stator core 2P is formed by coupling each single-layer tooth ST1 to the single-layer ring core SR1.

[0074] In contrast, in the stator core 2 of the present embodiment, some of the single-layer teeth ST1 (target teeth) among the multiple single-layer teeth ST1 are divided into the first divided core 4 and the second divided core 5. This makes it easier to assemble the stator core 2 compared to when the target teeth are made of a single member. In other words, because the target teeth are divided into multiple divided cores (the first divided core and the second divided core 5), it is possible to reduce the possibility that, when inserting the target teeth inside the coil 7, the wide portion T12 and the single-layer ring core SR1 will get in the way, making it impossible to insert the target teeth into the coil 7.

[0075] If the target teeth are made of a single member, manufacturing errors may occur depending on the dimensions of the target teeth. In contrast, in the stator core 2 of this embodiment, the target teeth are divided into a first divided core 4 and a second divided core 5, so manufacturing errors may occur depending on the dimensions of the first divided core 4 and the second divided core 5, which are smaller than the target teeth. Therefore, manufacturing errors in the dimensions of the target teeth may be reduced compared to when the target teeth are made of a single member. Furthermore, manufacturing machines can be made more compact compared to when the target teeth are made of a single member.

[0076] In the stator core 2 of this embodiment, the single-layer ring core SR1 is divided into multiple divided cores (first to third divided cores 4, 5, and 6). Therefore, compared to when the single-layer ring core SR1 is made of a single member, manufacturing errors in the dimensions of the single-layer ring core SR1 can be reduced in some cases. Compared to when the single-layer ring core SR1 is made of a single member, manufacturing machinery can be made more compact.

[0077] In this embodiment, the target tooth is divided in the circumferential direction of the single-layer ring core SR1. On the other hand, the target tooth is not divided in the radial direction of the single-layer ring core SR1. More specifically, each of the divided cores (first to third divided cores 4, 5, 6) has a length from one end of the single-layer tooth ST1 opposite the single-layer ring core SR1 side to the end of the single-layer ring core SR1 opposite (outside) the single-layer tooth ST1 side. Therefore, compared to when the target tooth is divided in the radial direction of the single-layer ring core SR1, the possibility of a decrease in magnetic strength along the radial direction can be reduced, and the magnetic efficiency of the motor M1 can be improved.

[0078] (Variation 1) The stator core 2 according to the first modification will be described below with reference to Fig. 10. Fig. 10 is an exploded view of the main part of the stator core 2 according to the first modification. The same components as those in the embodiment are denoted by the same reference numerals and will not be described again.

[0079] It is not essential that the multiple divided cores (first to third divided cores 4, 5, 6) have the positioning structures 40, 50, 60. For example, the contact surfaces of the multiple divided cores may be flat.

[0080] The first divided core 4 of the first modification has a convex portion 41 and a concave portion 42 as a positioning structure 40 at the joint portion with the second divided core 5, but does not have a positioning structure 40 (convex portion 43 (see FIG. 2)) at the contact portion with the third divided core 6. The first divided core 4 has a flat contact surface 430 at the contact portion with the third divided core 6.

[0081] The second divided core 5 of the first modification has a recess 51 and a protrusion 52 as a positioning structure 50 at the joint with the first divided core 4, but does not have a positioning structure 50 (protrusion 53 (see FIG. 2)) at the contact portion with the third divided core 6. The second divided core 5 has a flat contact surface 530 at the contact portion with the third divided core 6.

[0082] The third divided core 6 of the first modification does not have a positioning structure 60 (recess 61 (see FIG. 2)) at the contact portion with the first divided core 4. The third divided core 6 has a flat contact surface 610 at the contact portion with the first divided core 4. The contact surface 610 comes into contact with the contact surface 430.

[0083] The third divided core 6 does not have a positioning structure 60 (recess 62 (see FIG. 2)) at the contact portion with the second divided core 5. The third divided core 6 has a flat contact surface 620 at the contact portion with the second divided core 5. The contact surface 620 comes into contact with the contact surface 530.

[0084] Even if at least some of the positioning structures 40, 50, 60 are missing, the stator core 2 can be assembled by using a jig 9 (see Figure 3) to position the multiple split cores (first to third split cores 4, 5, 6) and by welding or bonding the multiple split cores at their contact surfaces.

[0085] Furthermore, the convex portion 41 and concave portion 42 as the positioning structure 40 and the concave portion 51 and convex portion 52 as the positioning structure 50 are not essential components, and the contact portion between the first divided core 4 and the second divided core 5 may be flat.

[0086] (Variation 2) The stator core 2 according to the modified example 2 will be described below with reference to Fig. 11. Fig. 11 is an exploded view of a main part of the stator core 2 according to the modified example 2. The same components as those in the embodiment are denoted by the same reference numerals and will not be described again.

[0087] The split cores (first to third split cores 4, 5, 6) of Modification 2 differ from those of the embodiment in the shapes of some of the convex and concave portions of the positioning structures 40, 50, 60. That is, the convex portion 43 of the first split core 4 at the joint with the third split core 6 is cylindrical. The convex portion 53 of the second split core 5 at the joint with the third split core 6 is cylindrical. The concave portion 61 of the third split core 6 at the joint with the first split core 4 is cylindrical and hollow so as to fit with the convex portion 43. The concave portion 62 of the third split core 6 at the joint with the second split core 5 is cylindrical and hollow so as to fit with the convex portion 53.

[0088] The plurality of split cores are joined together by aligning the recesses and protrusions in the axial direction of the single-layer ring core SR1 and moving them in the same direction.

[0089] According to the second modification, the bonding strength between the multiple divided cores can be increased compared to the embodiment.

[0090] The engagement between the convex portion 43 and the concave portion 61 may involve deformation of the first divided core 4 and the third divided core 6. For example, the convex portion 43 and the concave portion 61 may be engaged with each other while one of the first divided core 4 and the third divided core 6 moves in the circumferential direction of the single-layer ring core SR1. This joins the first divided core 4 and the third divided core 6 to each other.

[0091] The engagement between the convex portion 53 and the concave portion 62 may involve deformation of the second divided core 5 and the third divided core 6. For example, the convex portion 53 and the concave portion 62 may be engaged with each other while one of the second divided core 5 and the third divided core 6 moves in the circumferential direction of the single-layer ring core SR1. This joins the second divided core 5 and the third divided core 6 to each other.

[0092] (Variation 3) The stator core 2 according to the third modification will be described below with reference to Fig. 12. Fig. 12 is a perspective view of a main part of the stator core 2 according to the third modification. The same components as those in the embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0093] The stator core 2 of Modification 3 has multiple blocks 3, including a first block 3A, a second block 3B, a third block 3C, and a fourth block 3D. That is, the number of blocks 3 in Modification 3 is four. The third block 3C has the same structure as the first block 3A, and the fourth block 3D has the same structure as the second block 3B. FIG. 12 illustrates only a portion of each block 3. That is, FIG. 12 illustrates one first unit U1 and one second unit U2. Each of the first unit U1 and the second unit U2 includes one coil 7 and one of the multiple split cores (first to third split cores 4, 5, 6) of each block 3, the split core including the single-layer tooth ST1 inserted into the coil 7.

[0094] The first unit U1 and the second unit U2 are provided with alternating first-type stages (stages in which the first divided cores 4 and the second divided cores 5 are arranged) and second-type stages (stages in which the third divided cores 6 are arranged). The first unit U1 has a first-type stage at the top, and the second unit U2 has a second-type stage at the top.

[0095] Each of the first unit U1 and the second unit U2 is formed, for example, by inserting the single-layer teeth ST1 of the first block 3A and the second block 3B inside the coil 7 using a process similar to that of the embodiment, and then inserting the single-layer teeth ST1 of the third block 3C and the fourth block 3D inside the coil 7 using a similar process.

[0096] A plurality of first units U1 and a plurality of second units U2 are formed. Each first unit U1 and two adjacent second units U2 are connected to each other at each divided core (first to third divided cores 4, 5, 6). In this way, all of the first units U1 and second units U2 are connected in an annular shape to form the stator core 2.

[0097] (Variation 4) The stator core 2 according to the fourth modification will be described below with reference to Fig. 13. Fig. 13 is a perspective view of a main part of the stator core 2 according to the fourth modification. The same components as those in the embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0098] Each of the first unit U1 and the second unit U2 is formed by stacking split cores in two or more stages in the axial direction of the ring core R1. Here, for each of the first unit U1 and the second unit U2, the number of stacked split cores in the axial direction of the ring core R1 is referred to as the number of stages. At least one of the first unit U1 and the second unit U2 may have three or more stages. The number of stages in the first unit U1 and the second unit U2 may be the same or different. In other words, multiple teeth T1 and ring core R1 may be formed by first units U1 and second units U2 having different numbers of stages.

[0099] Furthermore, the plurality of first units U1 may include first units U1 with different numbers of stages (i.e., several types of first units U1). The plurality of second units U2 may include second units U2 with different numbers of stages.

[0100] Fig. 13 shows an example of the configuration of the second unit U2 having three stages. The second unit U2 includes a coil 7, first to third divided cores 4, 5, and 6, as well as a fourth divided core 31 and a fifth divided core 32. In Fig. 13, the fourth divided core 31 and the fifth divided core 32 are distinguished by the density of the dots.

[0101] The fourth divided core 31 and the fifth divided core 32 form a stage between the stage in which the first divided core 4 and the second divided core 5 are arranged and the stage in which the third divided core 6 is arranged.

[0102] The fourth divided core 31 has a lower section 311 and an upper section 312. The lower section 311 and the upper section 312 are integrally connected. The lower section 311 contacts the first divided core 4. The shape of the lower section 311 follows the shape of the first divided core 4. The upper section 312 contacts the third divided core 6. The upper section 312 is formed to follow the shape of the first of the first and second members that are formed if the third divided core 6 were to be divided into two in the circumferential direction of the ring core R1.

[0103] The fifth divided core 32 has a lower portion 321 and an upper portion 322. The lower portion 321 and the upper portion 322 are integrally connected. The lower portion 321 contacts the second divided core 5. The shape of the lower portion 321 follows the shape of the second divided core 5. The upper portion 322 contacts the third divided core 6. The upper portion 322 is formed to follow the shape of the second of the first and second members that are formed if the third divided core 6 were to be divided into two in the circumferential direction of the ring core R1.

[0104] When assembling the second unit U2, for example, the first split core 4 and the second split core 5 are inserted into the coil 7, then the fourth split core 31 and the fifth split core 32 are inserted into the coil 7, and finally the third split core 6 is inserted into the coil 7.

[0105] In this way, the stator core 2 can be configured even if at least one of the plurality of first units U1 and the plurality of second units U2 has three or more stages.

[0106] In one unit (first unit U1 or second unit U2), the number of rows of teeth T1 may be different from the number of rows of ring cores R1. In other words, the number of single-layer teeth ST1 included in teeth T1 may be different from the number of single-layer ring cores SR1 included in ring core R1.

[0107] The configuration of the second unit U2 of the fourth modification may be applied to the first unit U1.

[0108] (Other Modifications of the Embodiments) Other variations of the embodiment are listed below. The following variations may be implemented in appropriate combination. The following variations may also be implemented in appropriate combination with the above-described variations.

[0109] 14A to 14D each show a plurality of split cores according to a modified example. Although the split cores are arranged linearly in FIGS. 14A to 14D, these are merely schematic diagrams, and in reality, the split cores are arranged in a circular pattern. Furthermore, although positioning structure 40 (or 50, 60) for positioning the split cores is not provided in FIGS. 14A to 14D, a positioning structure 40 (or 50, 60) may be provided.

[0110] The types of divided cores are not limited to the three types of the first to third divided cores 4, 5, and 6. For example, as shown in FIG. 14A, the multiple divided cores may include a fourth divided core 200 disposed between the first divided core 4 and the second divided core 5. The fourth divided core 200 is coupled to the first divided core 4 and the second divided core 5.

[0111] 14B, the multiple divided cores may include a fifth divided core 201 disposed between the first divided core 4 and the third divided core 6. The fifth divided core 201 is coupled to the first divided core 4 and the third divided core 6. The fifth divided core 201 includes an area of ​​the single-layer ring core SR1 that is not connected to the multiple single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1).

[0112] 14B, the multiple divided cores may include a sixth divided core 202 disposed between the second divided core 5 and the third divided core 6. The sixth divided core 202 is coupled to the second divided core 5 and the third divided core 6. The sixth divided core 202 includes an area of ​​the single-layer ring core SR1 that is not connected to the multiple single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1).

[0113] The number of types of split cores is not limited to three or more, and may be one or two. For example, in FIG. 14A or 14B, the first split core 4 and the second split core 5 may be cores of the same shape (i.e., the same type). Furthermore, as shown in FIG. 14C, the stator core 2 may be formed by combining a plurality of split cores (first split cores 4) of one type, each including a portion of the single-layer tooth ST1 and a portion of the single-layer ring core SR1. Alternatively, as shown in FIG. 14D, the stator core 2 may be formed by combining a plurality of first split cores 4 and a plurality of second split cores 5. In FIG. 14D, the first split core 4 includes a portion of the single-layer tooth ST1, a region of the single-layer ring core SR1 that is connected to the plurality of single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1), and a region of the single-layer ring core SR1 that is not connected to the plurality of single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1). In FIG. 14D, the second divided core 5 includes a part of the single-layer tooth ST1 and a region of the single-layer ring core SR1 that is connected to a plurality of single-layer teeth ST1 in the radial direction (of the single-layer ring core SR1).

[0114] The multiple divided cores (for example, the first to third divided cores 4, 5, and 6) do not have to be arranged periodically in the circumferential direction of the single-layer ring core SR1.

[0115] The second block 3B does not have to have the same structure as the first block 3A. For example, the second block 3B may be integrally formed without being divided into multiple divided cores. Alternatively, the second block 3B may be divided into a single-layer ring core SR1 and multiple single-layer teeth ST1.

[0116] The shape of the outer edge and the inner edge of each coil 7 is not limited to a rectangular shape, but may be, for example, a square shape or a ring shape.

[0117] Each coil 7 is not limited to a molded coil, but may be a coil formed by winding a linear conductor around the tooth T1. The cross-sectional shape of the linear conductor may be, for example, annular, rectangular, or square.

[0118] The number of blocks 3 is not limited to two, but may be three or more.

[0119] The teeth T1 may be connected to the outer edge of the ring core R1. In this case, the rotor 8 may be disposed radially outward of the ring core R1 relative to the teeth T1.

[0120] In addition to the first unit U1 and the second unit U2, the stator core 2 may further include a magnetic member other than these. When the stator core 2 has an odd number of teeth T1, the stator core 2 will, for example, include a plurality of first units U1 and a plurality of second units U2, the number of which is one more or one less than the number of first units U1. In this case, a pair of first units U1 or a pair of second units U2 will be adjacent to each other in the circumferential direction of the ring core R1. Therefore, the stator core 2 may further include a magnetic member connecting the pair of adjacent first units U1 or the pair of second units U2.

[0121] (summary) The above-described embodiments and the like disclose the following aspects.

[0122] A stator core (2) according to a first aspect includes an annular ring core (R1) and a plurality of teeth (T1). The plurality of teeth (T1) protrude from the ring core (R1) in a radial direction of the ring core (R1). The plurality of teeth (T1) are arranged in a circumferential direction of the ring core (R1). Each of the plurality of teeth (T1) is configured to be surrounded by a coil (7). At least one of the plurality of teeth (T1) includes a plurality of single-layer teeth (ST1). The plurality of single-layer teeth (ST1) overlap each other in the axial direction of the ring core (R1). The stator core (2) includes a plurality of divided cores (first to third divided cores 4, 5, 6). The plurality of divided cores include a first divided core (4) and a second divided core (5). The first divided core (4) and the second divided core (5) each include a portion of corresponding teeth among the plurality of single-layer teeth (ST1). The target teeth are formed by joining a first divided core (4) and a second divided core (5) together in the circumferential direction of the ring core (R1).

[0123] According to the above configuration, since the target teeth are divided into a plurality of split cores, the assembly of the stator core (2) becomes easier compared to when the target teeth are made up of a single member.

[0124] In a stator core (2) according to a second aspect, in the first aspect, the target tooth includes a coil arrangement portion (T11) and a wide portion (T12). The coil arrangement portion (T11) is surrounded by the coil (7). The wide portion (T12) is located on the opposite side of the coil arrangement portion (T11) from the ring core (R1). The wide portion (T12) is wider in the circumferential direction than the coil arrangement portion (T11).

[0125] According to the above configuration, the target tooth is divided into multiple split cores, so that when inserting the target tooth inside the coil (7), the wide portion (T12) and the ring core (R1) can get in the way, reducing the possibility that the target tooth cannot be inserted into the coil (7).

[0126] In the stator core 2 according to the third aspect, the first divided core 4 has a part of the coil arrangement portion T11, a part of the wide portion T12, and a part of the ring core R1 in the second aspect, and the second divided core 5 has another part of the coil arrangement portion T11, another part of the wide portion T12, and another part of the ring core R1.

[0127] According to the above configuration, the stator core (2) can be assembled by supporting a portion of the ring core (R1) of the first divided core (4) and the second divided core (5), which makes it even easier to assemble the stator core (2).

[0128] In addition, in a stator core 2 according to a fourth aspect, in any one of the first to third aspects, the plurality of divided cores includes a third divided core 6. The third divided core 6 has one of the plurality of single-layer teeth ST1. The third divided core 6 overlaps with the first divided core 4 and the second divided core 5 in the axial direction of the ring core R1.

[0129] According to the above configuration, the stator core (2) can be assembled more easily than when the third split core (6) is not provided.

[0130] In addition, in a stator core 2 according to a fifth aspect, in the fourth aspect, the plurality of divided cores include a plurality of first divided cores 4, a plurality of second divided cores 5, and a plurality of third divided cores 6. The plurality of first divided cores 4, the plurality of second divided cores 5, and the plurality of third divided cores 6 are periodically arranged in the circumferential direction of the ring core R1 and are connected to each other in that direction.

[0131] According to the above configuration, the number of types of members constituting the stator core (2) can be reduced.

[0132] Furthermore, a stator core (2) according to a sixth aspect is the stator core (2) of the fourth or fifth aspect, and includes a plurality of first units (U1) and a plurality of second units (U2). The second units (U2) are coupled to the first units (U1) in the circumferential direction of the ring core (R1). Each of the plurality of first units (U1) and the plurality of second units (U2) includes a first divided core (4), a second divided core (5), and a third divided core (6). The first divided core (4) and the second divided core (5) of the plurality of first units (U1) face the third divided core (6) of the plurality of second units (U2) in the circumferential direction of the ring core (R1). The third divided core (6) of the plurality of first units (U1) face the first divided core (4) and the second divided core (5) of the plurality of second units (U2) in the circumferential direction of the ring core (R1).

[0133] According to the above configuration, by forming a plurality of first units (U1) and a plurality of second units (U2), the stator core (2) can be easily assembled.

[0134] In addition, in the stator core (2) according to the seventh aspect, in the sixth aspect, the first divided cores (4) and second divided cores (5) of the plurality of first units (U1) are joined to the third divided cores (6) of the plurality of second units (U2). The third divided cores (6) of the plurality of first units (U1) are joined to the first divided cores (4) and second divided cores (5) of the plurality of second units (U2).

[0135] According to the above configuration, the first unit (U1) and the second unit (U2) are mutually supported, and the mechanical strength of the stator core (2) can be improved.

[0136] In addition, in the stator core (2) according to the eighth aspect, in the sixth or seventh aspect, the plurality of first units (U1) and the plurality of second units (U2) are arranged alternately in the circumferential direction of the ring core (R1) and are connected to each other in that direction.

[0137] According to the above configuration, the first unit (U1) and the second unit (U2) are mutually supported, and the mechanical strength of the stator core (2) can be improved.

[0138] In addition, the stator core (2) according to a ninth aspect is any one of the first to eighth aspects, wherein at least one of the plurality of split cores further includes a part of the ring core (R1).

[0139] According to the above configuration, the ring core (R1) can be formed in sections, so that the manufacturing machine can be made smaller.

[0140] Furthermore, a stator core (2) according to a tenth aspect is any one of the first to ninth aspects and has a plurality of blocks (3). Each of the plurality of blocks (3) includes an annular single-layer ring core (SR1) and a plurality of single-layer teeth (ST1). The plurality of single-layer teeth (ST1) protrude from the single-layer ring core (SR1) in a radial direction of the single-layer ring core (SR1). The ring core (R1) and the plurality of teeth (T1) are formed by stacking a plurality of blocks (3) in the axial direction of the single-layer ring core (SR1). Each of the plurality of blocks (3) includes a plurality of divided cores.

[0141] According to the above configuration, the manufacturing machine for the stator core (2) can be made smaller than when the stator core (2) is made of a single block (3).

[0142] In addition, in a stator core (2) according to an eleventh aspect, in any one of the first to tenth aspects, at least one of the plurality of divided cores (first to third divided cores 4, 5, 6) has a positioning structure (40, 50, 60) that positions adjacent divided cores.

[0143] According to the above configuration, the assembly of the stator core (2) becomes even easier.

[0144] Furthermore, the stator core (2) according to a twelfth aspect is the same as any one of the first to eleventh aspects, and further includes jig receiving portions (21, 22). A positioning jig (9) is disposed in the jig receiving portions (21, 22). The first divided core (4) and the second divided core (5) are joined to each other in the circumferential direction to form the jig receiving portion (21).

[0145] According to the above configuration, the assembly of the stator core (2) becomes even easier.

[0146] The configurations other than the first aspect are not essential for the stator core (2) and can be omitted as appropriate.

[0147] The stator core member according to the thirteenth aspect is used as one of the divided cores (first to third divided cores 4, 5, 6) in the stator core (2) according to any one of the first to twelfth aspects.

[0148] According to the above configuration, the stator core (2) can be easily assembled.

[0149] A stator (1) according to a fourteenth aspect includes the stator core (2) according to any one of the first to twelfth aspects. The stator (1) includes a plurality of coils (7).

[0150] According to the above configuration, the stator core (2) can be easily assembled.

[0151] A motor (M1) according to a fifteenth aspect includes the stator (1) according to the fourteenth aspect and a rotor (8). The rotor (8) is disposed radially inside or outside the ring core (R1) with respect to the plurality of teeth (T1). The rotor (8) rotates relative to the stator core (2).

[0152] According to the above configuration, the stator core (2) can be easily assembled. [Industrial Applicability]

[0153] The stator core, stator core member, stator, and motor of the present disclosure are useful in industrial equipment including a motor. [Explanation of symbols]

[0154] 1 stator 2 stator core 2P stator core 3 blocks 3A Block 1 3B 2nd Block 3C 3rd Block 3D Block 4 4. First split core (split core) 5 Second split core (split core) 6 Third split core (split core) 7 coils 8 rotors 9 Jig 21, 22 Jig receiving part 40, 50, 60 positioning structure 200 4th division core 201 5th division core 202 6th division core M1 motor R1 Ring Core SR1 Single-layer Ring Core ST1 Single layer teeth T1 Teeth T11 Coil placement section T12 wide part U1 1st Unit U2 2nd Unit

Claims

1. A stator core comprising an annular ring core and a plurality of teeth protruding from the ring core in a radial direction of the ring core and each configured to be surrounded by a coil, wherein at least one of the plurality of teeth comprises a plurality of single-layer teeth overlapping each other in the axial direction of the ring core, the stator core comprises a plurality of split cores, the plurality of split cores including a first split core and a second split core each having a portion of a target tooth among the plurality of single-layer teeth, the target tooth being formed by joining the first split core and the second split core to each other in the circumferential direction of the ring core, The plurality of split cores include a third split core having one of the plurality of single-layer teeth, and the third split core overlaps the first split core and the second split core in the axial direction. In the axial direction of the ring core, the length of a coil arrangement portion surrounded by the coil of the tooth is shorter than the length of the cavity of the coil. The length of the coil arrangement portion of the tooth is equal to the sum of the lengths of the first split core, the second split core, and the third split core. The lengths of the first split core, the second split core, and the third split core in the longitudinal direction are equal to one another. Stator core.

2. The target teeth are: the coil arrangement section; 2. The stator core according to claim 1, further comprising: a wide portion that is located on an opposite side of the ring core from the coil arrangement portion and that is wider than the coil arrangement portion in the circumferential direction.

3. 3. The stator core according to claim 2, wherein the first divided core has a portion of the coil arrangement portion, a portion of the wide portion, and a portion of the ring core, and the second divided core has another portion of the coil arrangement portion, another portion of the wide portion, and another portion of the ring core.

4. 2. The stator core according to claim 1, wherein the plurality of split cores include a plurality of the first split cores, a plurality of the second split cores, and a plurality of the third split cores, and the plurality of the first split cores, the plurality of the second split cores, and the plurality of the third split cores are arranged periodically in the circumferential direction and are connected to each other in the circumferential direction.

5. 5. The stator core according to claim 1, further comprising: a first unit; and a second unit coupled to the first unit in the circumferential direction, wherein each of the first units and the second units includes the first split core, the second split core, and the third split core, wherein the first split core and the second split core of the first units face the third split core of the second units in the circumferential direction, and the third split core of the first units faces the first split core and the second split core of the second units in the circumferential direction.

6. 6. The stator core of claim 5, wherein the first split core and the second split core of the plurality of first units are coupled to the third split core of the plurality of second units, and the third split core of the plurality of first units is coupled to the first split core and the second split core of the plurality of second units.

7. The stator core according to claim 5 or 6, wherein the plurality of first units and the plurality of second units are arranged alternately in the circumferential direction and are connected to one another in the circumferential direction.

8. The stator core according to any one of claims 1 to 7, wherein at least one of the plurality of split cores further includes a part of the ring core.

9. A plurality of blocks, each of the plurality of blocks comprising: an annular single-layer ring core; A stator core as described in any one of claims 1 to 8, comprising: a plurality of single-layer teeth protruding from the single-layer ring core in the radial direction of the single-layer ring core, wherein the ring core and the plurality of teeth are formed by stacking the plurality of blocks in the axial direction of the single-layer ring core, and each of the plurality of blocks comprises the plurality of split cores.

10. 10. The stator core according to claim 1, wherein at least one of the plurality of divided cores has a positioning structure for positioning adjacent divided cores.

11. A stator core according to any one of claims 1 to 10, having a jig receiving portion on which a positioning jig is placed, and the first divided core and the second divided core are joined to each other in the circumferential direction to form the jig receiving portion.

12. 12. A stator core member used as one of the plurality of split cores in the stator core according to claim 1.

13. A stator comprising the stator core according to any one of claims 1 to 11 and a plurality of the coils.

14. A motor comprising: the stator according to claim 13; and a rotor arranged radially inside or outside the ring core with respect to the plurality of teeth and rotating relative to the stator core.

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