Stator core, stator core components, stator and motor

Abstract

The stator core has an annular core and multiple teeth. Each tooth is configured to be surrounded by a coil. At least one of the teeth comprises multiple single-layer teeth. The multiple single-layer teeth overlap each other axially within the annular core. The stator core also has multiple segmented cores. These segmented cores include a first segmented core and a second segmented core. The opposing teeth in the multiple single-layer teeth are formed by the first and second segmented cores being joined together circumferentially within the annular core.

Description

Technical Field

[0001] This disclosure generally relates to a stator core, a stator core assembly, a stator, and an electric motor. More specifically, this disclosure relates to a stator core having a plurality of segmented cores, a stator core assembly for the stator core, a stator having the stator core, and an electric motor. Background Technology

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

[0003] The stator core described in Patent Document 1 is manufactured, for example, by assembling multiple segmented cores. Therefore, there are situations where it is desirable to improve the assemblability of the stator core.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-086579 Summary of the Invention

[0007] This disclosure aims to facilitate the assembly of the stator core.

[0008] One aspect of this disclosure includes a stator core comprising an annular core and a plurality of teeth. The plurality of teeth project radially from the annular core. Each of the plurality of teeth is configured to be surrounded by a coil. At least one of the plurality of teeth comprises a plurality of single-layer teeth. The plurality of single-layer teeth overlap each other axially within the annular core. The stator core also includes a plurality of segmented cores. The plurality of segmented cores includes a first segmented core and a second segmented core. The first segmented core and the second segmented core each have a portion of a target tooth among the plurality of single-layer teeth. The target tooth is formed by the first segmented core and the second segmented core being joined together circumferentially within the annular core.

[0009] In one embodiment of this disclosure, the stator core component is used as one of the plurality of segmented cores.

[0010] One embodiment of this disclosure has a stator having the stator core. The stator has a plurality of the coils.

[0011] One embodiment of the electric motor disclosed herein includes a stator and a rotor. The rotor is arranged radially inside or outside the ring core relative to the plurality of teeth. The rotor rotates relative to the stator core.

[0012] This disclosure has the advantage of making the assembly of the stator core easier. Attached Figure Description

[0013] Figure 1 This is a perspective view of an electric motor according to one embodiment.

[0014] Figure 2 This is an exploded view of the main parts of the stator of the aforementioned electric motor.

[0015] Figure 3 This is a top view showing the assembled state of the stator described above.

[0016] Figure 4 This is a diagram illustrating the assembly process of the stator described above.

[0017] Figure 5 This is a diagram illustrating the assembly process of the stator described above.

[0018] Figure 6 This is a diagram illustrating the assembly process of the stator described above.

[0019] Figure 7 This is a diagram illustrating the assembly process of the stator described above.

[0020] Figure 8 This is a diagram illustrating the assembly process of the stator described above.

[0021] Figure 9 This is a top view of the stator core of the comparative example stator.

[0022] Figure 10 This is an exploded view of the main part of the stator core of Modified Example 1.

[0023] Figure 11 This is an exploded view of the main part of the stator core of variant example 2.

[0024] Figure 12 This is a perspective view of the main part of the stator core of variant example 3.

[0025] Figure 13 This is a three-dimensional view of the main part of the stator core of variant example 4.

[0026] Figure 14A This is a top view of the main part of the stator core in other variations.

[0027] Figure 14B This is a top view of the main part of another stator core in other variations.

[0028] Figure 14C This is a top view of the main part of another oscillator core in other variations.

[0029] Figure 14D This is a top view of the main part of the oscillator core in other variations. Detailed Implementation

[0030] (Implementation Method)

[0031] The stator core 2, stator core components, stator 1, and motor M1 of the embodiments will be described below using the accompanying drawings. However, the following embodiments are merely one of many embodiments of this disclosure. Various modifications can be made to the following embodiments, depending on the design, etc., as long as the objectives of this disclosure are achieved. Furthermore, the figures described in the following embodiments are schematic, and the ratios of the size and thickness of each component in the figures may not reflect the actual dimensional ratios.

[0032] (1) Summary

[0033] Figure 1 This is a perspective view of an electric motor M1 according to one embodiment. Figure 2 This is an exploded view of the main part of the stator 1 of the electric motor M1. Figure 3 This is a top view showing the assembled state of stator 1. For example... Figure 1 As shown, the stator 1 of this embodiment includes a stator core 2. Furthermore, the stator 1 includes a plurality of coils 7.

[0034] The stator core 2 has an annular ring core R1 and multiple (in) Figure 1 The stator core 2 has 18 teeth T1. Multiple teeth T1 protrude radially from the ring core R1. Multiple teeth T1 are arranged circumferentially along the ring core R1. Each of the multiple teeth T1 is configured to be surrounded by a coil 7. At least one of the multiple teeth T1 includes multiple single-layer teeth ST1. The multiple single-layer teeth ST1 overlap each other axially in the ring core R1. The stator core 2 has multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6). The multiple segmented cores include the first segmented core 4 and the second segmented core 5. The first segmented core 4 and the second segmented core 5 each have a portion of the target tooth among the multiple single-layer teeth ST1. The target tooth is formed by the first segmented core 4 and the second segmented core 5 being joined together circumferentially in the ring core R1.

[0035] The stator core component is used in stator core 2 as one of a plurality of segmented cores (first segmented core 4, second segmented core 5 or third segmented core 6).

[0036] According to this embodiment, since the target tooth is divided into a first segmented core 4 and a second segmented core 5, the assembly of the stator core 2 becomes easier compared to the case where the target tooth is composed of a single component.

[0037] (2) Electric motor

[0038] In this embodiment, the stator 1 is used as an example for motor M1. However, the stator 1 can also be used as a generator.

[0039] The electric motor M1 has a stator 1 and a rotor 8. The stator core 2 is formed of a magnetic material. The rotor 8 is arranged radially inside the ring core R1 with respect to a plurality of teeth T1. The rotor 8 rotates relative to the stator core 2.

[0040] The rotor 8 has a rotor core 81, a rotating shaft 82, and a plurality of permanent magnets 83. The rotor core 81 is formed of a magnetic material. The rotor core 81 is cylindrical in shape. The rotor core 81 has a first through hole at its center for the rotating shaft 82 to pass through. Additionally, in the rotor core 81, around the first through hole, there are a plurality of second through holes for the insertion of the plurality of permanent magnets 83. The rotor 8 has four (in...) Figure 1 (Only 3 permanent magnets are shown in the figure) The four permanent magnets 83 are arranged in a square when viewed from the axial direction of the rotation axis 82. The magnetic flux generated by the multiple coils 7 of the stator 1 acts on the multiple permanent magnets 83, thereby causing the rotor 8 to rotate relative to the stator 1.

[0041] (3) Multiple blocks

[0042] The stator core 2 has a plurality of blocks 3. In this embodiment, the number of blocks 3 is even. 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 a plurality of blocks 3. The plurality of blocks 3 each have an annular single-layer ring core SR1 and a plurality of (in Figure 1 There are 18 single-layer teeth ST1. Multiple single-layer teeth ST1 protrude radially from the single-layer ring core SR1.

[0043] The ring core R1 and multiple teeth T1 are formed by overlapping multiple blocks 3 along the axial direction of the single-layer ring core SR1. That is, the single-layer ring cores SR1 of each block 3 overlap along this direction to form the ring core R1. The multiple single-layer teeth ST1 of each block 3 correspond one-to-one with the multiple single-layer teeth ST1 of other blocks 3. The corresponding single-layer teeth ST1 overlap along the axial direction of the single-layer ring core SR1 to form multiple teeth T1. Each tooth T1 originates from each block 3 having one single-layer tooth ST1 (i.e., one single-layer tooth ST1 of the first block 3A and one single-layer tooth ST1 of the second block 3B). The multiple blocks 3 each have multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6).

[0044] Viewed axially from 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 construction as the first block 3A. "Same construction" includes a shape where the dimensions of each part are equal when viewed axially from the single-layer ring core SR1. Additionally, "same construction" includes a shape where the shapes of each part differ slightly when viewed axially from the single-layer ring core SR1. For example, "same construction" includes a shape that differs in shape to facilitate the joining of multiple segmented cores. Furthermore, "same construction" includes a shape where the dimensions of the single-layer ring core SR1 are equal in the axial direction, and a shape where the dimensions of the single-layer ring core SR1 are different in the axial direction. In this embodiment, the dimensions of each part of the second block 3B are equal to the dimensions of each part of the first block 3A. Furthermore, in this disclosure, "equal" is not limited to a strictly identical case, but also includes cases where they differ within an allowable error range.

[0045] The second block 3B is overlapped with the first block 3A at a staggered rotation angle relative to the first block 3A. Specifically, the second block 3B is overlapped with the first block 3A in such a way that the first segment core 4 and the second segment core 5 of one block 3 and the third segment core 6 of another block 3 are arranged in the axial direction of the single-layer ring core SR1.

[0046] (4) Ring core

[0047] In multiple blocks 3, single-layer ring cores SR1 overlap along their axial direction to form a ring-shaped ring core R1. The axial direction of the single-layer ring core SR1 is consistent with the axial direction of the ring core R1. The radial direction of the single-layer ring core SR1 is consistent with the radial direction of the ring core R1. The circumferential direction of the single-layer ring core SR1 is consistent 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 arranged along its circumferential direction. Multiple teeth T1 are connected to the inner edge of the ring core R1 and arranged along its circumferential direction.

[0048] (5) Teeth

[0049] In multiple blocks 3, multiple single-layer teeth ST1 overlap along the axial direction of the single-layer ring core SR1 to form teeth T1. That is, the multiple single-layer teeth ST1 of the first block 3A and the multiple single-layer teeth ST1 of the second block 3B correspond one-to-one, and the two corresponding single-layer teeth ST1 overlap 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.

[0050] (6) Coil

[0051] 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). Multiple teeth T1 correspond one-to-one with multiple coils 7, and each tooth T1 is surrounded by its corresponding coil 7. However, in Figure 1The diagram only shows 6 of the 18 coils 7, omitting the diagram of the remaining coils 7.

[0052] The multiple coils 7 are shaped coils. A shaped coil is a coil pre-formed to surround an object. In this respect, a shaped coil differs from a coil formed by winding a linear conductor around an object. In this embodiment, the object surrounded by the shaped coil is a tooth T1.

[0053] Each coil 7 includes a conductor and an electrically insulating sheath covering the surface of the conductor. Each coil 7 is formed by stacking plate-shaped conductors in a spiral pattern. Viewed radially from the core R1, the outer and inner edges of each coil 7 are rectangular. Each coil 7 has terminals 71, 72 at both ends for electrical connection to other coils 7 or a power source (see reference). Figure 2 ).

[0054] (7) Segmented Core

[0055] The structure of multiple blocks 3 will be explained in further detail below.

[0056] Each block 3 has multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6). Each block 3 is formed by combining multiple segmented cores together. More specifically, each block 3 is formed by combining multiple segmented cores together in the circumferential direction of a single-layer ring core SR1.

[0057] The multiple segmented cores are each a stacked steel plate. That is, each segmented core comprises multiple steel plates, which are stacked. The multiple segmented cores are joined together in the circumferential direction of the single-layer ring core SR1. The multiple segmented cores include multiple first segmented cores 4, multiple second segmented cores 5, and multiple third segmented cores 6. Each block 3 has the same number of first segmented cores 4, second segmented cores 5, and third segmented cores 6 (9 in this embodiment). Each block 3 is formed by periodically arranging and joining the multiple first segmented cores 4, multiple second segmented cores 5, and multiple third segmented cores 6 in the circumferential direction of the single-layer ring core SR1. More specifically, each block 3 is constructed by repeatedly arranging the first segmented cores 4, second segmented cores 5, and third segmented cores 6 in that order.

[0058] The structure of the first block 3A, of the first block 3A and the second block 3B, will now be described. 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 can also be considered a description of the structure of the second block 3B. Therefore, the description of the structure of the second block 3B is appropriately omitted.

[0059] The dividing cores (first dividing core 4, second dividing core 5, and third dividing core 6) each have a length from one end of the single-layer tooth ST1 opposite to the side of the single-layer ring core SR1 to the end of the single-layer ring core SR1 opposite to the side of the single-layer tooth ST1 (outer side).

[0060] A portion (9) of the multiple single-layer teeth ST1 in the first block 3A consists of one first dividing core 4 and one second dividing core 5. The remaining (9) of the multiple single-layer teeth ST1 in the first block 3A consists of one third dividing core 6.

[0061] The plurality of third segmented cores 6 of the first block 3A constitute half of the even-numbered single-layer teeth ST1 and at least a portion of the single-layer ring core SR1. The plurality of first segmented cores 4 and the plurality of second segmented cores 5 of the first block 3A constitute the remaining half of the single-layer teeth ST1 not formed by the plurality of third segmented cores 6 and at least a portion of the single-layer ring core SR1.

[0062] The single-layer ring core SR1 is constructed as follows. The plurality of first segmented cores 4 and the plurality of second segmented cores 5 of the first block 3A constitute the entire region of the single-layer ring core SR1 that is not connected to the plurality of single-layer teeth ST1 in the radial direction. The region of the single-layer ring core SR1 that is connected to half of the single-layer teeth ST1 in the radial direction is composed of the plurality of first segmented cores 4 and the plurality of second segmented cores 5. The region that is connected to the remaining half of the single-layer teeth ST1 in the radial direction is composed of the plurality of third segmented cores 6.

[0063] 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 (object tooth) formed by the first segmented core 4 and the second segmented core 5 also 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 exists on the side opposite to the toroidal core R1 when viewed from the coil arrangement portion T11. More specifically, the wide portion T12 exists at the end of the single-layer tooth ST1 on the side opposite to the toroidal core R1. In the circumferential direction of the toroidal core R1, the wide portion T12 is wider than the coil arrangement portion T11.

[0064] Thus, in the single-layer tooth ST1, the wide portion T12 extends to both sides in the circumferential direction of the ring core R1. In other words, in the single-layer tooth ST1, the end on the side opposite to the ring core R1 has two protrusions T120 with a length along the circumferential direction of the ring core R1.

[0065] Each protrusion T120 constitutes part of the magnetic circuit through which the magnetic flux passes through the rotor 8 and the stator 1. Therefore, compared with the case where there is no protrusion T120 (wide portion T12), the magnetic efficiency of the motor M1 can be improved, and the output torque of the motor M1 can be increased.

[0066] The first segmented core 4 has a portion of the coil arrangement section T11, a portion of the wide section T12, and a portion of the toroidal core R1 (single-layer toroidal core SR1). The second segmented core 5 has another portion of the coil arrangement section T11, another portion of the wide section T12, and another portion of the toroidal core R1 (single-layer toroidal core SR1). When the first segmented core 4 and the second segmented core 5 separate, the coil arrangement section T11 and the wide section T12 are separated along a centerline having a length in the radial direction of the toroidal core R1. That is, at this time, the coil arrangement section T11 and the wide section T12 are substantially divided into two equal parts.

[0067] like Figure 2 As shown, the first dividing core 4 has a protrusion 41 and a recess 42, which serve as a positioning structure 40 for positioning the second dividing core 5. The first dividing core 4 also has a protrusion 43, which serves as a positioning structure 40 for positioning the third dividing core 6.

[0068] The second dividing core 5 has a recess 51 and a protrusion 52, which serve as a positioning structure 50 for positioning the first dividing core 4. In addition, the second dividing core 5 has a protrusion 53, which serves as a positioning structure 50 for positioning the third dividing core 6.

[0069] The third segmented core 6 includes a coil arrangement portion T11 and a wide portion T12. Additionally, the third segmented core 6 has a recess 61, which serves as a positioning structure 60 for positioning the first segmented core 4. Furthermore, the third segmented core 6 has a recess 62, which serves as a positioning structure 60 for positioning the second segmented core 5.

[0070] Thus, at least one (in this embodiment, all) of the multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6) has a positioning structure 40 (or 50, 60) for positioning adjacent segmented cores. Positioning structures 40, 50, and 60 position multiple segmented cores belonging to the same block 3.

[0071] Figures 4-8 This is a diagram showing the assembly process of stator 1.

[0072] The protrusion 41 of the first segmented core 4 engages with the concave portion 51 of the second segmented core 5. The concave portion 42 of the first segmented core 4 engages with the protrusion 52 of the second segmented core 5. Thus, the first segmented core 4 and the second segmented core 5 are positioned relative to each other. Thus, the first segmented core 4 and the second segmented core 5 are joined together. More specifically, the first segmented core 4 and the second segmented core 5 are joined by positioning the protrusion 41 and the concave portion 51 axially opposite each other on the single-layer ring core SR1 (see reference). Figure 5 And the recess 42 and the protrusion 52 are opposite each other in the axial direction (see reference). Figure 5 ) and cause the first segment core 4 or the second segment core 5 to move along this axis and be joined (see reference). Figure 6 ).

[0073] The protrusion 43 of the first dividing core 4 engages with the concave portion 61 of the third dividing core 6. Thus, the first dividing core 4 and the third dividing core 6 are positioned relative to each other.

[0074] The protrusion 53 of the second dividing core 5 engages with the concave portion 62 of the third dividing core 6. Thus, the second dividing core 5 and the third dividing core 6 are positioned relative to each other.

[0075] The engagement of the protrusions and concave parts in each positioning structure 40 (or 50, 60) does not result in deformation of the segmented cores (first segmented core 4, second segmented core 5, third segmented core 6). Therefore, the possibility of a decrease in the magnetic efficiency of the motor M1 due to deformation of the segmented cores can be reduced.

[0076] Furthermore, the first piece 3A and the second piece 3B are assembled together, and the first segment 4, the second segment 5, and the third segment 6 of each of the first piece 3A and the second piece 3B are positioned relative to each other. Then, the first segment 4, the second segment 5, and the third segment 6 are integrated through an integration process. In the integration process, for example, the first segment 4, the second segment 5, and the third segment 6 are molded using a molding material such as resin.

[0077] Stator core 2 has a fixture 9 for positioning (see reference) Figure 3 The clamp bearing parts 21 and 22 (refer to) Figure 3 The stator core 2 of this embodiment has multiple (in) Figure 3 There are 18 clamping support portions. More specifically, each region of the single-layer ring core SR1 that is connected to multiple single-layer teeth ST1 in the radial direction is provided with a clamping support portion 21 or clamping support portion 22. In other words, each single-layer tooth ST1 and its corresponding clamping support portion 21 or clamping support portion 22 are arranged radially along the single-layer ring core SR1. The clamping support portions 21 and 22 are recesses provided on the outer peripheral surface of the single-layer ring core SR1.

[0078] like Figure 2 As shown, the third segment 6 has a clamp receiving part 22.

[0079] The first segmented core 4 has a cut 210. The second segmented core 5 has a cut 211. The first segmented core 4 and the second segmented core 5 are joined together, thereby connecting the cuts 210 and 211 to form the clamp receiving part 21. That is, the first segmented core 4 and the second segmented core 5 are joined together in the circumferential direction of the single-layer ring core SR1 to form the clamp receiving part 21.

[0080] The positioning fixture 9 has at least a contact portion 92. The contact portion 92 is the part that contacts the fixture receiving portion 21 or the fixture receiving portion 22. Figure 3 In the example shown, fixture 9 has multiple (in) Figure 3 The system comprises 18 contact portions 92 and a frame portion 91. The frame portion 91 is cylindrical in shape. Multiple contact portions 92 protrude from the inner edge of the frame portion 91. Multiple clamping portions 21 and 22 correspond one-to-one with the multiple contact portions 92, and each clamping portion 21 and 22 contacts the corresponding contact portion 92. Thus, multiple dividing cores (first dividing core 4, second dividing core 5, and third dividing core 6) are positioned.

[0081] (8) The relationship between the first and second pieces

[0082] 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 segmented cores 4, a plurality of second segmented cores 5, and a plurality of third segmented cores 6. The first segmented cores 4 and second segmented cores 5 are joined together in the circumferential direction of the single-layer ring core SR1 to form one of the multiple single-layer teeth ST1 of the second block 3B, which is the target tooth. Each third segmented core 6 forms one single-layer tooth ST1 that is different from the target tooth. The second block 3B is formed by arranging the plurality of first segmented cores 4, the plurality of second segmented cores 5, and the plurality of third segmented cores 6 periodically along the circumferential direction of the single-layer ring core SR1 and joining them together in that direction.

[0083] like Figure 1 As shown, the plurality of third segmented cores 6 of the second block 3B correspond one-to-one with the plurality of first segmented cores 4 and the plurality of second segmented cores 5 of the first block 3A, and overlap with the corresponding first segmented cores 4 and second segmented cores 5 along the axial direction of the single-layer ring core SR1. Furthermore, the plurality of first segmented cores 4 and the plurality of second segmented cores 5 of the second block 3B correspond one-to-one with the plurality of third segmented cores 6 of the first block 3A, and overlap with the corresponding third segmented core 6 along the axial direction of the single-layer ring core SR1.

[0084] Stator core 2 includes multiple first units U1 (refer to...) Figure 8 ) and multiple Unit 2 U2 (refer to Figure 8Multiple first units U1 respectively include the first segmented core 4 and the second segmented core 5 of the first block 3A, the third segmented core 6 of the second block 3B, and a coil 7. Multiple second units U2 respectively include the third segmented core 6 of the first block 3A, the first segmented core 4 and the second segmented 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 along the circumference of the single-layer ring core SR1 and are coupled to each other in this direction.

[0085] The first segment 4 and the second segment 5 of multiple first units U1 are opposite to the third segment 6 of multiple second units U2 in the circumferential direction of the ring core R1. The third segment 6 of multiple first units U1 are opposite to the first segment 4 and the second segment 5 of multiple second units U2 in the circumferential direction of the ring core R1.

[0086] Furthermore, the first segment core 4 and the second segment core 5 of the plurality of first units U1 are combined with the third segment core 6 of the plurality of second units U2. The third segment core 6 of the plurality of first units U1 are combined with the first segment core 4 and the second segment core 5 of the plurality of second units U2.

[0087] like Figure 8 As shown, in the axial direction of the ring core R1, the length H1 of the coil arrangement portion T11 of tooth T1 is shorter than the length H2 of the cavity of coil 7. Length H1 is equal to the sum of the length of the first segmented core 4 (or the second segmented core 5) of the first block 3A in the axial direction of the ring core R1 and the length of the third segmented core 6 of the second block 3B in the axial direction of the ring core R1. Length H1 is equal to the sum of the length of the third segmented core 6 of the first block 3A in the axial direction of the ring core R1 and the length of the first segmented core 4 (or the second segmented core 5) of the second block 3B in the axial direction of the ring core R1. The length H3 of each single-layer tooth ST1 in the length H1 direction is equal to the length of each segmented core in that direction.

[0088] In the circumferential direction along the single-layer ring core SR1, the length W1 of the coil configuration section T11 of the single-layer tooth ST1 (tooth T1) is shorter than the length W2 of the hole of the coil 7.

[0089] In addition, the coil configuration section T11 of the single-layer tooth ST1 in the cross section including the length H1 direction and the length W1 direction is rectangular in shape.

[0090] (9) Assembly process

[0091] Next, refer to Figures 4-8 and Figure 3An example of the assembly process for stator core 2 will be described. Hereinafter, the portion of the first segmented core 4 that constitutes part of the single-layer tooth ST1 will be referred to as segmented tooth 4t, and the portion of the first segmented core 4 that constitutes part of the single-layer ring core SR1 will be referred to as segmented ring core 4r. The portion of the second segmented core 5 that constitutes part of the single-layer tooth ST1 will be referred to as segmented tooth 5t, and the portion of the second segmented core 5 that constitutes part of the single-layer ring core SR1 will be referred to as segmented ring core 5r. The portion of the third segmented core 6 that constitutes the single-layer tooth ST1 will be referred to as segmented tooth 6t, and the portion of the third segmented core 6 that constitutes part of the single-layer ring core SR1 will be referred to as segmented ring core 6r.

[0092] First, such as Figure 4 As shown, the dividing tooth 5t of the second dividing core 5 is inserted into the inside of the coil 7. Inside the coil 7, the dividing tooth 5t occupies a length shorter than half the length H2 of the cavity in the coil 7. In the height direction (length H3 direction), a space longer than the length H3 of the first dividing core 4 (dividing tooth 4t) is left between the inner edge of the coil 7 and the dividing tooth 5t.

[0093] Next, as Figure 5 As shown, the dividing tooth 4t of the first dividing core 4 is inserted into the inside of the coil 7. Here, it is impossible to insert the dividing tooth 4t from the same height as the second dividing core 5 because of the protrusion 41 of the dividing tooth 4t and the protrusion T120 at the tip of the dividing tooth 4t (see reference). Figure 4 ) etc., interfere with the second segment core 5. Therefore, such as Figure 5 As shown, the dividing tooth 4t is inserted at a different height than the second dividing core 5.

[0094] Next, as Figure 6 As shown, the first dividing core 4 is moved to the same height as the second dividing core 5. At this time, the protrusion 41 of the first dividing core 4 and the concave portion 51 of the second dividing core 5 are engaged, and the concave portion 42 of the first dividing core 4 and the protrusion 52 of the second dividing core 5 are engaged.

[0095] Next, as Figure 7 As shown, the dividing teeth 6t of the third dividing core 6 are inserted into the inside of the coil 7. Here, two protrusions T120 (refer to) are not provided in the third dividing core 6. Figure 6 The third segmented core 6 is inserted into the inner side of the coil 7 first, on one side (the side of the segmented core 6r). Furthermore, the third segmented core 6 is inserted at a different height than the first segmented core 4 and the second segmented core 5. That is, the third segmented core 6 is inserted into the gap between the first segmented core 4 and the second segmented core 5 and the inner edge of the coil 7, which exists in the length H3 direction.

[0096] Through the above steps, the first segmented core 4, the second segmented core 5, and the third segmented core 6 can be inserted into the inside of the coil 7. The structure formed by the above steps is called the first unit U1. In addition, in the process of forming the first unit U1, after inserting the segmenting teeth 4t of the first segmented core 4 into the inside of the coil 7, the segmenting teeth 5t of the second segmented core 5 can be inserted into the inside of the coil 7.

[0097] By performing the above processes on multiple coils 7 respectively, and as... Figure 8 As shown, multiple first units U1 and multiple second units U2 are formed. Each first unit U1 and each second unit U2 includes a coil 7. The number of first units U1 and second units U2 is the same. In the first unit U1, the first segmented core 4 and the second segmented core 5 are arranged in the upper layer (on one side in the height H1 direction), and the third segmented core 6 is arranged in the lower layer (on the other side in the height H1 direction). In the second unit U2, the first segmented core 4 and the second segmented core 5 are arranged in the lower layer, and the third segmented core 6 is arranged in the upper layer. In summary, in each first unit U1 and second unit U2, a first type of layer (the layer with the first segmented core 4 and the second segmented core 5) and a second type of layer (the layer with the third segmented core 6) are alternately provided. The first type of layer is provided at the top of the first unit U1, and the second type of layer is provided at the top of the second unit U2.

[0098] Each first unit U1 and two adjacent second units U2 are joined together in each segmented core (first segmented core 4, second segmented core 5, third segmented core 6). Thus, all the first units U1 and second units U2 are joined in a ring to form the stator core 2. Furthermore, as... Figure 3 As shown, the fixture 9 is used to position multiple segment cores (first segment core 4, second segment core 5, and third segment core 6).

[0099] Multiple segmented cores are integrated in an integration process. This integration process can be achieved, for example, by laser welding or TIG (Tungsten Inert Gas) welding. Alternatively, the multiple segmented cores can be integrated by pressing them into the frame of the motor M1, axially covering the single-layer ring core SR1. Alternatively, the multiple segmented cores can be integrated by molding them with resin, for example. Alternatively, the multiple segmented cores can be integrated by bonding them with an adhesive. Furthermore, the integration process can be omitted, and the multiple segmented cores can be supported by the contact pressure generated between them.

[0100] Through the above processes, stator core 2 is formed.

[0101] (10) Advantages

[0102] Figure 9 The diagram illustrates a stator core 2P as a comparative example. Each block 3 of the stator core 2P has a single-layer ring core SR1 and multiple single-layer teeth ST1. The single-layer ring core SR1 is formed from a single component. Each single-layer tooth ST1 is formed from a single component. Each single-layer tooth ST1 is coupled to the single-layer ring core SR1, thereby forming the stator core 2P.

[0103] In contrast, in the stator core 2 of this embodiment, a portion of the multiple single-layer teeth ST1 (target teeth) are divided into a first segmented core 4 and a second segmented core 5. Therefore, the assembly of the stator core 2 becomes easier compared to the case where the target teeth are composed of a single component. That is, since the target teeth are divided into multiple segmented cores (the first segmented core and the second segmented core 5), when inserting the target teeth into the inside of the coil 7, for example, the possibility that the wide portion T12 and the single-layer ring core SR1 will become obstacles preventing the insertion of the target teeth into the coil 7 can be reduced.

[0104] When the target tooth is constructed from a single component, manufacturing errors corresponding to the size of the target tooth may occur. In contrast, in the stator core 2 of this embodiment, since the target tooth is divided into a first segmented core 4 and a second segmented core 5, manufacturing errors corresponding to the individual sizes of the first segmented core 4 and the second segmented core 5, which are smaller than the target tooth, may occur. Therefore, compared to the case where the target tooth is constructed from a single component, manufacturing errors in the size of the target tooth can sometimes be suppressed. Furthermore, compared to the case where the target tooth is constructed from a single component, the manufacturing machinery can be miniaturized.

[0105] In the stator core 2 of this embodiment, the single-layer ring core SR1 is divided into multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6). Therefore, compared to the case where the single-layer ring core SR1 is composed of a single component, manufacturing errors in the dimensions of the single-layer ring core SR1 can sometimes be suppressed. Compared to the case where the single-layer ring core SR1 is composed of a single component, the manufacturing machinery can be miniaturized.

[0106] In this embodiment, the target teeth are divided along the circumference of the single-layer ring core SR1. On the other hand, the target teeth are not divided along the radial direction of the single-layer ring core SR1. More specifically, the dividing cores (first dividing core 4, second dividing core 5, and third dividing core 6) each have a length from one end of the single-layer tooth ST1 opposite to the side of the single-layer ring core SR1 to the end of the single-layer ring core SR1 opposite to the side of the single-layer tooth ST1 (outer side). Therefore, compared to the case where the target teeth are divided along the radial direction of the single-layer ring core SR1, the possibility of a decrease in magnetic intensity along the radial direction can be reduced, and the magnetic efficiency of the motor M1 can be improved.

[0107] (Variation Example 1)

[0108] The following uses Figure 10 The stator core 2 of modified example 1 will be described. Figure 10 This is an exploded view of the main part of the stator core 2 in Modified Example 1. Structures identical to those in the embodiment are labeled with the same reference numerals, and descriptions are omitted.

[0109] Multiple segmented cores (first segmented core 4, second segmented core 5, third segmented core 6) do not necessarily have positioning structures 40, 50, 60. For example, the contact surfaces between the multiple segmented cores can also be planar.

[0110] In Modification 1, the first segmented core 4 has a protrusion 41 and a recess 42 at the joint portion where it engages with the second segmented core 5, serving as a positioning structure 40. On the other hand, it does not have a positioning structure 40 at the contact portion where it contacts the third segmented core 6 (protrusion 43 (see reference)). Figure 2 The first segment 4 has a planar contact surface 430 in the contact portion that contacts the third segment 6.

[0111] In Modification 1, the second segment 5 has a recess 51 and a protrusion 52 at the joint portion where it engages with the first segment 4, serving as a positioning structure 50. On the other hand, it does not have a positioning structure 50 at the contact portion where it contacts the third segment 6 (protrusion 53 (see reference)). Figure 2 The second segment 5 has a planar contact surface 530 at the contact portion that contacts the third segment 6.

[0112] In Modification 1, the third segmented core 6 does not have a positioning structure 60 (recess 61, see reference) at the contact portion with the first segmented core 4. Figure 2 The third segment 6 has a planar contact surface 610 at the contact portion that contacts the first segment 4. The contact surface 610 contacts the contact surface 430.

[0113] The third segment 6 does not have a positioning structure 60 (recess 62) at the contact portion with the second segment 5. Figure 2 The third segment 6 has a planar contact surface 620 at the contact portion that contacts the second segment 5. The contact surface 620 contacts the contact surface 530.

[0114] Even in cases where at least a portion of the positioning structures 40, 50, and 60 are absent, the clamp 9 (see reference) can be used. Figure 3 The stator core 2 is assembled by positioning multiple segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6) or by welding or bonding multiple segmented cores at the contact surfaces.

[0115] Furthermore, the protrusions 41 and 42 of the positioning structure 40 and the 51 and 52 of the positioning structure 50 are not essential structures, and the contact portion where the first dividing core 4 and the second dividing core 5 contact can also be planar.

[0116] (Variation Example 2)

[0117] The following uses Figure 11 The stator core 2 of modified example 2 will be described. Figure 11 This is an exploded view of the main part of the stator core 2 in Modified Example 2. Structures identical to those in the embodiment are labeled with the same reference numerals, and descriptions are omitted.

[0118] For the segmented cores (first segmented core 4, second segmented core 5, and third segmented core 6) in Modified Example 2, the shapes of the protrusions and recesses that form the positioning structures 40, 50, and 60 differ from those in the previous embodiment. Specifically, the protrusion 43 of the joint portion in the first segmented core 4 that engages with the third segmented core 6 is cylindrical. The protrusion 53 of the joint portion in the second segmented core 5 that engages with the third segmented core 6 is cylindrical. The recess 61 of the joint portion in the third segmented core 6 that engages with the first segmented core 4 is a cylindrical cavity to fit with the protrusion 43. The recess 62 of the joint portion in the third segmented core 6 that engages with the second segmented core 5 is a cylindrical cavity to fit with the protrusion 53.

[0119] Multiple segmented cores are joined together by making the concave and convex portions opposite each other in the axial direction of the single-layer ring core SR1 and moving in the same direction.

[0120] According to this modified example 2, the bonding strength between multiple segmented cores can be improved compared to the implementation method.

[0121] The engagement of the protrusion 43 and the concave portion 61 can also be accompanied by the deformation of the first segmented core 4 and the third segmented core 6. For example, while one of the first segmented core 4 and the third segmented core 6 moves circumferentially along the single-layer ring core SR1, the protrusion 43 and the concave portion 61 are engaged. Thus, the first segmented core 4 and the third segmented core 6 are joined together.

[0122] The engagement of the protrusion 53 and the recess 62 can also be accompanied by the deformation of the second segment core 5 and the third segment core 6. For example, while one of the second segment core 5 and the third segment core 6 moves circumferentially along the single-layer ring core SR1, the protrusion 53 and the recess 62 are engaged. Thus, the second segment core 5 and the third segment core 6 are joined together.

[0123] (Variation Example 3)

[0124] The following uses Figure 12 The stator core 2 of modified example 3 will be described. Figure 12This is a perspective view of the main part of the stator core 2 in Modified Example 3. Structures identical to those in the embodiment are labeled with the same reference numerals, and descriptions are omitted.

[0125] In the stator core 2 of Modified Example 3, in addition to the first block 3A and the second block 3B, there are also a third block 3C and a fourth block 3D to serve as multiple blocks 3. That is, the number of blocks 3 in Modified Example 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. Figure 12 The diagram only shows a portion of each block 3. That is, in Figure 12 The figure shows a first unit U1 and a second unit U2. The first unit U1 and the second unit U2 each include a coil 7 and a segmented core (first segmented core 4, second segmented core 5, and third segmented core 6) of each block 3, including a single-layer tooth ST1 into which the coil 7 is inserted.

[0126] In unit 1 U1 and unit 2 U2, a first type of layer (a layer with a first dividing core 4 and a second dividing core 5) and a second type of layer (a layer with a third dividing core 6) are alternately provided. The first type of layer is provided on the top layer of unit 1 U1, and the second type of layer is provided on the top layer of unit 2 U2.

[0127] Unit 1 U1 and Unit 2 U2 are formed, for example, by inserting the single-layer tooth ST1 of the first block 3A and the single-layer tooth ST1 of the second block 3B into the inside of the coil 7 through the same process as in the embodiment. Then, the single-layer tooth ST1 of the third block 3C and the single-layer tooth ST1 of the fourth block 3D are also inserted into the inside of the coil 7 through the same process.

[0128] Multiple first units U1 and second units U2 are formed respectively. Each first unit U1 and two adjacent second units U2 are joined together in each segment core (first segment core 4, second segment core 5, third segment core 6). Thus, all the first units U1 and second units U2 are joined in a ring to form the stator core 2.

[0129] (Variation Example 4)

[0130] The following uses Figure 13 The stator core 2 of modified example 4 will be described. Figure 13 This is a perspective view of the main part of the stator core 2 in Modified Example 4. Structures identical to those in the embodiment are labeled with the same reference numerals, and descriptions are omitted.

[0131] Unit 1 U1 and Unit 2 U2 are each formed by stacking two or more layers of dividing cores along the axial direction of the ring core R1. Here, the number of layers of dividing cores stacked along the axial direction of the ring core R1 for each Unit 1 U1 and each Unit 2 U2 is referred to as the number of layers. At least one of Unit 1 U1 and Unit 2 U2 may have three or more layers. The number of layers in Unit 1 U1 and Unit 2 U2 may be the same or different. That is, multiple teeth T1 and ring core R1 may be formed from Unit 1 U1 and Unit 2 U2 with different numbers of layers.

[0132] In addition, multiple first units U1 can also include first units U1 with different numbers of layers (i.e., multiple types of first units U1). Multiple second units U2 can also include second units U2 with different numbers of layers.

[0133] Figure 13 This illustrates a structural example of the second unit U2, which has three layers. In addition to coil 7 and the first segmented core 4, second segmented core 5, and third segmented core 6, the second unit U2 also includes a fourth segmented core 31 and a fifth segmented core 32. Figure 13 In the diagram, the density of points is used to distinguish and illustrate the fourth segment core 31 and the fifth segment core 32.

[0134] The fourth segment core 31 and the fifth segment core 32 constitute a layer between the layer containing the first segment core 4 and the second segment core 5 and the layer containing the third segment core 6.

[0135] The fourth segmented core 31 has a lower portion 311 and an upper portion 312. The lower portion 311 and the upper portion 312 are integrally connected. The lower portion 311 is connected to the first segmented core 4. The shape of the lower portion 311 follows the shape of the first segmented core 4. The upper portion 312 is connected to the third segmented core 6. The upper portion 312 is formed along the shape of the first member of the first member and the second member, assuming that the third segmented core 6 is divided into two parts along the circumference of the ring core R1.

[0136] The fifth segmented 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 is connected to the second segmented core 5. The shape of the lower portion 321 follows the shape of the second segmented core 5. The upper portion 322 is connected to the third segmented core 6. The upper portion 322 is formed along the shape of the second member of the first and second members, assuming that the third segmented core 6 is divided into two parts along the circumference of the ring core R1.

[0137] When assembling the second unit U2, for example, the first segment core 4 and the second segment core 5 are inserted into the coil 7, then the fourth segment core 31 and the fifth segment core 32 are inserted into the coil 7, and finally the third segment core 6 is inserted into the coil 7.

[0138] In this way, even if at least one of the multiple first units U1 and multiple second units U2 has more than three layers, it can still form the stator core 2.

[0139] In a single unit (unit 1 U1 or unit 2 U2), the number of layers of tooth T1 and the number of layers of ring core R1 can also be different. That is, the number of single-layer teeth ST1 included in tooth T1 and the number of single-layer ring cores SR1 included in ring core R1 can also be different.

[0140] The structure of the second unit U2 in variation example 4 can also be applied to the first unit U1.

[0141] (Other variations of the implementation method)

[0142] The following are other variations of the embodiments. These variations can also be implemented through appropriate combinations. Furthermore, these variations can also be implemented through appropriate combinations with the variations described above.

[0143] Figures 14A to 14D These represent multiple segmented cores in the modified example. Furthermore, in Figures 14A to 14D In the middle, multiple segmented cores are arranged in a straight line, but Figures 14A to 14D Ultimately, this is just a schematic diagram; in reality, multiple segmented cores are arranged in a ring. Furthermore, in Figures 14A to 14D The positioning structure 40 (or 50, 60) for positioning between the split cores is not provided, but positioning structure 40 (or 50, 60) may be provided.

[0144] The types of dividing cores are not limited to the three types: the first dividing core 4, the second dividing core 5, and the third dividing core 6. For example, such as... Figure 14A As shown, the plurality of segmented cores may also include a fourth segmented core 200 disposed between the first segmented core 4 and the second segmented core 5. The fourth segmented core 200 is combined with the first segmented core 4 and the second segmented core 5.

[0145] In addition, such as Figure 14B As shown, the plurality of segmented cores may also include a fifth segmented core 201 disposed between the first segmented core 4 and the third segmented core 6. The fifth segmented core 201 is coupled to both the first segmented core 4 and the third segmented core 6. The fifth segmented core 201 includes a region in the monolayer ring core SR1 that is not radially connected to the plurality of monolayer teeth ST1.

[0146] In addition, such as Figure 14BAs shown, the plurality of segmented cores may also include a sixth segmented core 202 disposed between the second segmented core 5 and the third segmented core 6. The sixth segmented core 202 is coupled to the second segmented core 5 and the third segmented core 6. The sixth segmented core 202 includes a region in the monolayer ring core SR1 that is not radially connected to the plurality of monolayer teeth ST1.

[0147] Furthermore, the types of split cores are not limited to three or more; they can also be one or two. For example, in Figure 14A or Figure 14B In this context, the first segmented core 4 and the second segmented core 5 can also be cores of the same shape (i.e., of the same type). Additionally, for example, such as... Figure 14C As shown, the stator core 2 can also be formed by combining multiple segmented cores (first segmented core 4) including a portion of a single-layer tooth ST1 and a portion of a single-layer ring core SR1. Alternatively, as... Figure 14D As shown, a stator core 2 can also be formed by combining multiple first segmented cores 4 and multiple second segmented cores 5. Figure 14D In the first segmented core 4, there are: a portion of the single-layer tooth ST1, a region of the single-layer ring core SR1 that is radially connected to multiple single-layer teeth ST1, and a region of the single-layer ring core SR1 that is radially not connected to multiple single-layer teeth ST1. Figure 14D In the middle, the second segment core 5 includes: a portion of the single-layer tooth ST1, and a region in 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).

[0148] Multiple segmented cores (e.g., segmented core 4, segmented core 5, segmented core 6) may also be arranged not periodically along the circumference of the single-layer ring core SR1.

[0149] The second piece 3B may not have the same construction as the first piece 3A. For example, the second piece 3B may not be divided into multiple segmented cores but may be formed integrally. Alternatively, the second piece 3B may be divided into a single-layer ring core SR1 and multiple single-layer teeth ST1.

[0150] The shape of the outer edge and the inner edge of each coil 7 are not limited to a rectangle; for example, they can also be a square or a ring.

[0151] Each coil 7 is not limited to a shaped coil, but can also be a coil formed by winding a linear conductor around an object (tooth T1). The cross-sectional shape of the linear conductor can be, for example, a loop, a rectangle, or a square.

[0152] The number of blocks 3 is not limited to two; it can also be three or more.

[0153] Multiple teeth T1 can also be connected to the outer edge of the ring core R1. In this case, the rotor 8 can be arranged radially outside the ring core R1 relative to the multiple teeth T1.

[0154] In the stator core 2, in addition to the first unit U1 and the second unit U2, it may also have magnetic components different from the first unit U1 and the second unit U2. For example, if the number of teeth T1 in the stator core 2 is odd, the stator core 2 may have multiple first units U1 and multiple second units U2, one more and one less than the number of first units U1. Thus, a pair of first units U1 or a pair of second units U2 are adjacent to each other in the circumferential direction of the ring core R1. Therefore, the stator core 2 may also have magnetic components that connect adjacent pairs of first units U1 or pairs of second units U2.

[0155] (Summarize)

[0156] Based on the embodiments described above, the following configurations are disclosed.

[0157] The stator core (2) of the first form has an annular core (R1) and a plurality of teeth (T1). The plurality of teeth (T1) protrude radially from the annular core (R1). The plurality of teeth (T1) are arranged circumferentially along the annular core (R1). The plurality of teeth (T1) are each 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 annular core (R1). The stator core (2) has a plurality of segmented cores (first segmented core 4, second segmented core 5, third segmented core 6). The plurality of segmented cores include a first segmented core (4) and a second segmented core (5). The first segmented core (4) and the second segmented core (5) each have a portion of the target teeth in the plurality of single-layer teeth (ST1). The target teeth are formed by the first segmented core (4) and the second segmented core (5) being joined together in the circumferential direction of the annular core (R1).

[0158] According to the above structure, since the object teeth are divided into multiple segmented cores, the assembly of the stator core (2) becomes easier compared to the case where the object teeth are composed of a single component.

[0159] Furthermore, for the stator core (2) of the second configuration, in the first configuration, the 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) exists on the side opposite to the toroidal core (R1) when viewed from the coil arrangement portion (T11). The wide portion (T12) is wider than the coil arrangement portion (T11) in the circumferential direction.

[0160] According to the above structure, since the target tooth is divided into multiple segmented cores, when the target tooth is inserted into the inside of the coil (7), the possibility that the wide portion (T12) and the ring core (R1) will become obstacles and make it impossible to insert the target tooth into the coil (7) can be reduced.

[0161] Furthermore, for the stator core (2) of the third form, in the second form, the first segmented core (4) has a portion of the coil arrangement section (T11), a portion of the wide section (T12), and a portion of the toroidal core (R1). The second segmented core (5) has another portion of the coil arrangement section (T11), another portion of the wide section (T12), and another portion of the toroidal core (R1).

[0162] According to the above structure, the stator core (2) can be assembled by supporting a portion of the ring core (R1) in the first segmented core (4) and the second segmented core (5), thus making the assembly of the stator core (2) easier.

[0163] Furthermore, for the stator core (2) of the fourth configuration, in any of the configurations from the first to the third configuration, the plurality of segmented cores includes a third segmented core (6). The third segmented core (6) has one of the plurality of single-layer teeth (ST1). The third segmented core (6) overlaps the first segmented core (4) and the second segmented core (5) along the axial direction of the ring core (R1).

[0164] Based on the above structure, the assembly of the stator core (2) becomes easier compared to the case where the third segmented core (6) is not present.

[0165] Furthermore, for the stator core (2) of the fifth configuration, in the fourth configuration, the multiple segmented cores include multiple first segmented cores (4), multiple second segmented cores (5), and multiple third segmented cores (6). The multiple first segmented cores (4), multiple second segmented cores (5), and multiple third segmented cores (6) are arranged periodically along the circumference of the ring core (R1) and are interlocked in that direction.

[0166] Based on the above structure, the number of types of components constituting the stator core (2) can be suppressed.

[0167] Furthermore, for the stator core (2) of the sixth configuration, in the fourth or fifth configuration, it comprises multiple first units (U1) and multiple second units (U2). The second units (U2) are coupled to the first units (U1) along the circumferential direction of the ring core (R1). The multiple first units (U1) and multiple second units (U2) each include a first segmented core (4), a second segmented core (5), and a third segmented core (6). The first segmented core (4) and the second segmented core (5) of the multiple first units (U1) are opposite to the third segmented core (6) of the multiple second units (U2) in the circumferential direction of the ring core (R1). The third segmented core (6) of the multiple first units (U1) is opposite to the first segmented core (4) and the second segmented core (5) of the multiple second units (U2) in the circumferential direction of the ring core (R1).

[0168] According to the above structure, the assembly of the stator core (2) becomes easy by forming multiple first units (U1) and multiple second units (U2).

[0169] Furthermore, for the stator core (2) of the seventh configuration, in the sixth configuration, the first segmented core (4) and the second segmented core (5) of the plurality of first units (U1) are combined with the third segmented core (6) of the plurality of second units (U2). The third segmented core (6) of the plurality of first units (U1) is combined with the first segmented core (4) and the second segmented core (5) of the plurality of second units (U2).

[0170] According to the above structure, the first unit (U1) and the second unit (U2) can support each other, thereby improving the mechanical strength of the stator core (2).

[0171] In addition, for the stator core (2) of the eighth form, in the sixth or seventh form, a plurality of first units (U1) and a plurality of second units (U2) are alternately arranged in the circumferential direction of the ring core (R1) and are combined with each other in that direction.

[0172] According to the above structure, the first unit (U1) and the second unit (U2) can support each other, thereby improving the mechanical strength of the stator core (2).

[0173] In addition, for the stator core (2) of the ninth form, in any of the forms from the first to the eighth forms, at least one of the multiple segmented cores also has a portion of a ring core (R1).

[0174] Based on the above structure, since the ring core (R1) can be formed in sections, the manufacturing machinery can be miniaturized.

[0175] Furthermore, for the stator core (2) of the 10th configuration, in any of the 1st to 9th configurations, it has multiple blocks (3). Each of the multiple blocks (3) has an annular single-layer ring core (SR1) and multiple single-layer teeth (ST1). The multiple single-layer teeth (ST1) protrude radially from the single-layer ring core (SR1). The ring core (R1) and the multiple teeth (T1) are formed by overlapping the multiple blocks (3) along the axial direction of the single-layer ring core (SR1). Each of the multiple blocks (3) has multiple segmented cores.

[0176] Based on the above structure, compared with the case where the stator core (2) is composed of a single block (3), the manufacturing machinery of the stator core (2) can be miniaturized.

[0177] In addition, for the stator core (2) of the 11th form, in any of the forms from the 1st to the 10th forms, at least one of the multiple segmented cores (the 1st segmented core 4, the 2nd segmented core 5, and the 3rd segmented core 6) has a positioning structure (40, 50, 60) for positioning adjacent segmented cores.

[0178] Based on the above structure, the assembly of the stator core (2) becomes easier.

[0179] Furthermore, the stator core (2) of the 12th form has a clamp receiving portion (21, 22) in any of the 1st to 11th forms. A positioning clamp (9) is arranged in the clamp receiving portion (21, 22). The first segmented core (4) and the second segmented core (5) are joined together in the circumferential direction to form the clamp receiving portion (21).

[0180] Based on the above structure, the assembly of the stator core (2) becomes easier.

[0181] The structures other than the first form are not necessary for the stator core (2) and can be appropriately omitted.

[0182] In addition, the stator core member of the 13th form is used as one of the multiple segmented cores (1st segmented core 4, 2nd segmented core 5, 3rd segmented core 6) in any of the stator cores (2) of the 1st to 12th forms.

[0183] Based on the above structure, the assembly of the stator core (2) becomes easy.

[0184] In addition, the stator (1) of the 14th form has a stator core (2) of any one of the 1st to 12th forms. The stator (1) has multiple coils (7).

[0185] Based on the above structure, the assembly of the stator core (2) becomes easy.

[0186] Furthermore, the motor (M1) of the 15th form includes the stator (1) of the 14th form and the rotor (8). The rotor (8) is arranged radially inside or outside the ring core (R1) relative to a plurality of teeth (T1). The rotor (8) rotates relative to the stator core (2).

[0187] Based on the above structure, the assembly of the stator core (2) becomes easy.

[0188] Industrial availability

[0189] The stator core, stator core components, stator, and electric motor disclosed herein are effective for industrial equipment including electric motors.

[0190] Explanation of reference numerals in the attached figures

[0191] 1. Stator; 2. Stator core; 2P. Stator core; 3. Block; 3A. Block 1; 3B. Block 2; 3C. Block 3; 3D. Block 4; 4. First segmented core (segmented core); 5. Second segmented core (segmented core); 6. Third segmented core (segmented core); 7. Coil; 8. Rotor; 9. Fixture; 21, 22. Fixture bearing part; 40, 50, 60. Positioning structure; 200. Fourth segmented core; 201. Fifth segmented core; 202. Sixth segmented core; M1. Motor; R1. Ring core; SR1. Single-layer ring core; ST1. Single-layer tooth; T1. Tooth; T11. Coil arrangement part; T12. Wide part; U1. Unit 1; U2. Unit 2.

Claims

1. A stator core comprising an annular core and a plurality of teeth arranged to project radially from the annular core and surrounded by coils, wherein, At least one of the plurality of teeth comprises a plurality of single-layer teeth that overlap each other in the axial direction of the ring core. The stator core includes a plurality of segmented cores, each of which includes a first segmented core and a second segmented core, each having a portion of an object tooth among the plurality of single-layer teeth. The object tooth is formed by the first segmented core and the second segmented core being joined together in the circumferential direction of the ring core. The plurality of segmented cores includes a third segmented core having one of the plurality of single-layer teeth, the third segmented core overlapping the first segmented core and the second segmented core along the axial direction. In the axial direction of the ring core, the length of the coil configuration portion of the tooth surrounded by the coil is shorter than the length of the hole of the coil. The length of the coil configuration portion of the tooth is equal to the sum of the length of the first segmented core or the length of the second segmented core and the length of the third segmented core. The lengths of the first segmented core, the second segmented core, and the third segmented core are equal to each other in the length direction.

2. The stator core according to claim 1, wherein, The object teeth include: The coil configuration section; and The wide portion exists on the side opposite to the core side when viewed from the coil configuration portion and is wider than the coil configuration portion in the circumferential direction.

3. The stator core according to claim 2, wherein, The first segmented core has a portion of the coil configuration portion, a portion of the wide portion, and a portion of the toroidal core, and the second segmented core has another portion of the coil configuration portion, another portion of the wide portion, and another portion of the toroidal core.

4. The stator core according to claim 3, wherein, The plurality of segmented cores includes a plurality of first segmented cores, a plurality of second segmented cores, and a plurality of third segmented cores, which are arranged periodically along the circumferential direction and are coupled to each other in the circumferential direction.

5. The stator core according to claim 3, wherein, The stator core includes a plurality of first units and a second unit that is coupled to the first units along the circumferential direction. The plurality of first units and the plurality of second units respectively include a first segmented core, a second segmented core and a third segmented core. The first segmented core and the second segmented core of the plurality of first units are opposite to the third segmented core of the plurality of second units in the circumferential direction, and the third segmented core of the plurality of first units is opposite to the first segmented core and the second segmented core of the plurality of second units in the circumferential direction.

6. The stator core according to claim 5, wherein, The first and second segmented cores of the plurality of first units are combined with the third segmented core of the plurality of second units, and the third segmented core of the plurality of first units is combined with the first and second segmented cores of the plurality of second units.

7. The stator core according to claim 5, wherein, The plurality of first units and the plurality of second units are arranged alternately in the circumferential direction and are combined with each other in the circumferential direction.

8. The stator core according to claim 1, wherein, At least one of the plurality of segmented cores also has a portion of the ring core.

9. The stator core according to claim 1, wherein, The stator core has multiple blocks. Each of the plurality of blocks has: A single-layered ring core in the shape of a ring; and The plurality of single-layer teeth protrude radially from the single-layer ring core. The ring core and the plurality of teeth are formed by overlapping the plurality of blocks along the axial direction of the single-layer ring core, and the plurality of blocks each have the plurality of segmented cores.

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

11. The stator core according to any one of claims 1 to 10, wherein, The stator core has a clamping support portion for arranging a positioning fixture, and the first segmented core and the second segmented core are joined together in the circumferential direction to form the clamping support portion.

12. A stator core component, wherein, The stator core component is used as one of the plurality of segmented cores in the stator core according to any one of claims 1 to 11.

13. A stator, wherein, The stator has a stator core as described in any one of claims 1 to 11, and has a plurality of said coils.

14. An electric motor, wherein, The electric motor includes a stator as described in claim 13, and a rotor that is arranged radially inside or outside the ring core relative to the plurality of teeth and rotates relative to the stator core.

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