Stator core and motor

Abstract

To simplify manufacturing facilities.SOLUTION: A stator core comprises: a ring-shaped first core having two end parts which face each other in the circumferential direction; and a second core having a plurality of teeth which extend from one side to the other side in the radial direction. The plurality of teeth each have a base end part which circumferentially extends at a tip end on the other side. The base end parts of the plurality of teeth are coupled together in the circumferential direction. A tip end surface on one side of each of the plurality of teeth comes into contact with a circumferential surface on the other side of the first core.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] There is a stator core that has an inner core including a plurality of teeth having an outer peripheral surface located at the radial tip side, and an outer core including a cylindrical annular portion having an inner peripheral surface (see, for example, Patent Document 1).

[0003] The outer core is then rotated in a circumferential direction relative to the inner core to bring the outer peripheral surface of the inner core into contact with the inner peripheral surface of the outer core, thereby assembling the inner core to the outer core.

[0004] In some stator cores, the diameter of the outer circumferential surface of the inner core is larger than the diameter of the inner circumferential surface of the outer core at room temperature, and the inner core is assembled to the outer core by shrink fitting. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-278893 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional stator cores have room for improvement in terms of simplifying the manufacturing equipment.

[0007] The present invention has been made in view of the above, and has an object to provide a stator core that can be manufactured using simple equipment. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the stator core of the present invention comprises a ring-shaped first core having two circumferentially opposing ends, and a second core having a plurality of teeth extending radially from one side to the other side, each of the plurality of teeth having a base end extending in the circumferential direction at a tip of the other side, the base ends of each of the plurality of teeth being connected in the circumferential direction, and the tip surface on the one side of each of the plurality of teeth contacting the peripheral surface of the other side of the first core.

[0009] According to one aspect of the stator core of the present invention, the manufacturing equipment can be simplified. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view of a motor having a stator core according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the stator core shown in FIG. [Diagram 3] FIG. 3 is a plan view showing the assembly of the stator core shown in FIG. [Figure 4] FIG. 4 is a partial enlarged view showing two circumferentially opposing ends of the first core shown in FIG. [Diagram 5] FIG. 5 is a perspective view showing a stator core according to a first modified example of the first embodiment. [Figure 6] FIG. 6 is a perspective view showing assembly of a first core in the stator core shown in FIG. [Figure 7] FIG. 7 is a perspective view showing assembly of a first core in the stator core shown in FIG. [Figure 8] FIG. 8 is a perspective view showing assembly of the first core in the stator core shown in FIG. [Figure 9] FIG. 9 is a perspective view showing a first core in the stator core shown in FIG. [Figure 10] FIG. 10 is a perspective view showing an outer core which is a first core of a stator core according to a second modified example of the first embodiment. [Figure 11] FIG. 11 is a plan view of a motor having a stator core according to the second embodiment. [Figure 12] FIG. 12 is an exploded perspective view of the stator core shown in FIG. [Figure 13] FIG. 13 is a partial enlarged view showing a part of the first core (inner core) when the stator core shown in FIG. 12 is assembled. [Figure 14] FIG. 14 is a perspective view showing an inner core of a stator core according to a first modified example of the second embodiment. [Figure 15] FIG. 15 is a perspective view showing an inner core of a stator core according to a second modified example of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A stator core and a motor according to an embodiment will be described in detail below with reference to the drawings. The dimensional relationships of the elements in the drawings, the ratios of the elements, and the like may differ from the reality. The drawings may also include parts with different dimensional relationships and ratios. In principle, the contents described in one embodiment or modified example are similarly applied to other embodiments or modified examples.

[0012] [First embodiment] FIG. 1 is a plan view of a motor 1 having a stator core 41 according to the first embodiment. FIG. 2 is an exploded perspective view of the stator core 41 shown in FIG. 1. FIG. 3 is a plan view showing the assembly of the stator core 41 shown in FIG. 2. FIG. 4 is a partially enlarged view showing two ends 411a1 and 411a2 facing each other in the circumferential direction C of the outer core 411. In FIG. 1, the x marks on both sides of the teeth 412a, which will be described later, are shown without showing the windings that are wound around the teeth 412a to form the coils 42. In FIG. 3, for the sake of convenience, the coils 42 wound around the teeth 412a are omitted.

[0013] 1 to 3 according to the first embodiment, in order to facilitate understanding of directions, the direction in which a shaft 2 described later extends is referred to as the axial direction A, the direction in which a shaft 2 described later rotates is referred to as the circumferential direction C, and the direction that is included in a plane perpendicular to the axial direction A, passes through an axis 2o of the shaft 2, and is perpendicular to the circumferential direction C is referred to as the radial direction R. In addition, in the motor 1 according to this embodiment, for example, one direction side (e.g., the clockwise direction side) in the circumferential direction C is the rotation direction side C2 of the rotor 3 and the shaft 2, and the other direction side (e.g., the counterclockwise direction side) in the circumferential direction C is the reverse rotation direction side C1.

[0014] 1 according to the first embodiment is an inner rotor type in which, when viewed from the axial direction A, the stator 4 is located outside the rotor 3 in the radial direction R, and the shaft 2 is located inside the rotor 3 in the radial direction R, with the rotor 3 as the reference. Therefore, in the stator 4 according to this embodiment, the inside in the radial direction R is referred to as the rotor side R1 in the radial direction R, and the outside in the radial direction R is referred to as the opposite side R2 in the radial direction R.

[0015] The motor 1 according to the first embodiment is, for example, an electric motor that converts electric energy from a power source into a driving force that rotates a shaft 2 in a circumferential direction C. The motor 1 is housed, for example, in a frame (not shown).

[0016] The motor 1 includes, for example, a shaft 2, a rotor 3, and a stator 4. The shaft 2 is a so-called rotating shaft, and is formed, for example, from a metal member in a cylindrical shape extending along an axial direction A. The shaft 2 has an axis 2o, and is provided so as to be rotatable about the axis 2o. The shaft 2 transmits power to the outside by rotating in a circumferential direction C.

[0017] The rotor 3 is provided to be rotatable around the axis 2o of the shaft 2. The rotor 3 according to this embodiment is disposed opposite the stator 4 in the radial direction R, and is fixed to the shaft 2. Furthermore, in the motor 1 according to this embodiment, the shaft 2 and the rotor 3 are formed as separate bodies, and the inner peripheral surface of the rotor 3 is fixed to the outer peripheral surface of the shaft 2.

[0018] The rotor 3 is disposed, for example, inside the stator 4 in the radial direction R and faces the stator 4 in the radial direction R with a gap 3s between them.

[0019] The rotor 3 includes a yoke 31 and a magnet 32. The yoke 31 is made of a magnetic material such as iron. The yoke 31 is formed, for example, in a cylindrical shape, and the magnet 32 ​​is embedded inside.

[0020] The magnets 32 are, for example, permanent magnets. The magnets 32 are disposed at equal intervals in the circumferential direction C.

[0021] The stator 4 is a part that generates a force for rotating the rotor 3 in the circumferential direction C. The stator 4 includes a stator core 41 and a plurality of coils .

[0022] The coil 42 is formed, for example, by winding a wire around the teeth 412a via an insulator (not shown). The wire has a conductive core wire (not shown) and an insulating covering portion (not shown) that covers the periphery of the core wire.

[0023] Stator core 41 is formed of a magnetic material such as a silicon steel plate. In other words, stator core 41 has magnetism. Stator core 41 includes outer core 411, which is a first core, and inner core 412, which is a second core. In stator core 41 according to this embodiment, outer core 411 and inner core 412 are formed separately.

[0024] The outer core 411 is formed in a ring shape and is located on the opposite side R2 in the radial direction R to the inner core 412. The outer core 411 is formed by stacking magnetic plate materials bo (see FIG. 4) in the axial direction A. The plate material bo is formed in a ring shape with a small thickness in the axial direction A and two ends facing each other in the circumferential direction C. The outer core 411 and the plate material bo according to this embodiment are formed in the same shape when viewed from above (when viewed from the axial direction A), and only the thickness in the axial direction A is different. In other words, the outer core 411, which is the first core, is formed by arranging multiple ring-shaped plate materials (portions) having two ends facing each other in the circumferential direction C in the axial direction A. Therefore, in the following description, the same reference numerals are used for the portions of the plate material bo that are the same in shape as those of the outer core 411, and the description is omitted.

[0025] When viewed in the axial direction A, the outer core 411 shown in FIG. 2 has a main body 411a and a protruding portion 411b.

[0026] The main body 411a has an inner circumferential surface (circumferential surface) 411ai located on the rotor side R1 in the radial direction R, and an outer circumferential surface 411ao located on the opposite side R2 in the radial direction R. A contact surface 411bi of the main body 411a, which will be described later, faces one outer end surface (tip surface) 412ao of each of the multiple teeth 412a in the radial direction R.

[0027] The main body 411a is formed to be continuous in the circumferential direction C and is formed to be elastically deformable. Furthermore, as shown in Fig. 4, the main body 411a has two end portions 411a1 and 411a2 that face each other in the circumferential direction C. Each of the end portions 411a1 and 411a2 includes, for example, a plane that extends in the axial direction A and also in the radial direction R, and these two planes become two opposing surfaces that face each other in the circumferential direction C.

[0028] In this embodiment, the two ends 411a1 and 411a2 facing each other in the circumferential direction C are disposed, for example, in a portion of the main body 411a where the protruding portion 411b is located. In addition, holes H1 and H2 are formed near the two ends 411a1 and 411a2, respectively. The holes H1 and H2 extend, for example, in the axial direction A.

[0029] The protruding portion 411b protrudes from an inner circumferential surface 411ai of the main body 411a toward the rotor side R1 in the radial direction R. Each of the protruding portions 411b has a contact surface 411bi that comes into contact with one outer end surface 412ao of each of the multiple teeth 412a.

[0030] Each of the teeth 412a extends from one side, that is, the outside, to the other side (inner side) in the radial direction R, and has a base end portion 412b extending in the circumferential direction C at the tip of the other side (see FIG. 2), and the base ends 412b of the multiple teeth 412a are connected to each other in the circumferential direction C. In other words, the base end portion 412b is formed in an annular shape when viewed from the axial direction A.

[0031] The base end portion 412b shown in FIG. 2 has an inner circumferential surface 412bi located on the rotor side R1 in the radial direction R, and an outer circumferential surface 412bo located on the opposite side R2 in the radial direction R.

[0032] Each of the multiple teeth 412a has an outer end face (tip face) 412ao on one side in the radial direction R. The outer end face 412ao faces, in the radial direction R, a contact surface 411bi of the outer core 411, which is a first core.

[0033] Next, the assembly of the stator core 41 will be described with reference to Figures 2, 3, and 4. First, an operator winds the coil 42 around the teeth 412a, and then places the outer core 411 on one side in the axial direction A with respect to the inner core 412, as shown in Figure 2.

[0034] Next, as shown in FIG. 3, the worker applies an external force F1 to the main body 411a to elastically deform it in the circumferential direction C so that a gap 4s is formed between one end 411a1 and the other end 411a2.

[0035] More specifically, the worker inserts one end 49a1 of the first jig 49A into a hole H1 formed near one end 411a1, and inserts the end 49b1 of the second jig 49B into a hole H2 formed near the other end 411a2. After that, the worker applies an external force F1 to the first jig 49A and the second jig 49B in the circumferential direction C to cause elastic deformation so that the first jig 49A and the second jig 49B are separated from each other, forming a gap 4s between the one end 411a1 and the other end 411a2. Therefore, a gap 4s exists between the contact surface 411bi and the outer end surface 412ao.

[0036] Next, the operator moves the outer core 411 to the other side in the axial direction A relative to the inner core 412 .

[0037] Next, the worker releases the external force F1 to elastically restore the main body 411a, and makes one end 411a1 and the other end 411a2 face each other in the circumferential direction C. In the circumferential direction C of the stator core 41 according to the present embodiment, the one end 411a1 and the other end 411a2 face each other with a small gap therebetween in the circumferential direction C, or the one end 411a1 and the other end 411a2 come into contact with each other in the circumferential direction C.

[0038] When one end 411a1 and the other end 411a2 face or contact each other with a small gap in the circumferential direction C, the contact surfaces 411bi of the multiple protrusions 411b come into contact with the outer end surfaces 412ao of the multiple teeth 412a, allowing the inner core 412 to be assembled to the outer core 411, and the stator core 41 can be assembled.

[0039] As described above, the stator core 41 of this embodiment has the outer core 411 and the inner core 412 provided separately, so that the outer core 411 does not get in the way when winding the coil 42 around the teeth 412a of the inner core 412, improving the workability of winding the coil 42 around the teeth 412a.

[0040] The stator core 41 according to this embodiment includes an outer core (first core) 411 having two ends 411a1, 411a2 facing each other in the circumferential direction C and an inner core (second core) 412 having a plurality of teeth 412a extending from one side to the other side in the radial direction R. Each of the plurality of teeth 412a has a base end 412b extending in the circumferential direction C at the tip of the other side. The base ends 412b of the plurality of teeth 412a are connected in the circumferential direction C. An outer end surface (tip surface) 412ao on one side of each of the plurality of teeth 412a contacts the circumferential surface on the other side of the outer core 411 (contact surface 411bi of the protrusion 411b). Moreover, in the outer core 411, the inner core 412 can be inserted into the rotor side R1 in the radial direction R of the outer core 411 in a state where the two ends 411a1, 411a2 facing each other in the circumferential direction C are separated. Therefore, when the outer core 411 is moved in the axial direction A relative to the inner core 412, the contact surface 411bi of the protruding portion 411b and the outer end surface 412ao of the tooth 412a can be prevented from coming into contact with each other. As a result, the friction between the contact surface 411bi and the outer end surface 412ao can be prevented. As described above, the stator core 41 can be assembled without going through a special process, and thus the manufacturing equipment can be simplified. In other words, according to the stator core 41 according to this embodiment, the time required to manufacture one stator core 41 (so-called tact time) can be shortened.

[0041] In the stator core 41 according to this embodiment, a plurality of protrusions 411b are formed on the peripheral surface of the outer core 411 facing one outer end surface 412ao of each of the plurality of teeth 412a, and each of the plurality of protrusions 411b has a contact surface 411bi that comes into contact with one outer end surface 412ao of each of the plurality of teeth 412a.

[0042] In the stator core 41 according to this embodiment, the outer core 411 is formed by arranging in the axial direction A a plurality of ring-shaped plate members (portions) bo each having two ends opposed to each other in the circumferential direction C.

[0043] The motor 1 according to this embodiment includes the stator core 41 and the rotor 3 described above.

[0044] In the above embodiment, outer core 411 includes main body 411a and protruding portion 411b. However, outer core 411 according to the present embodiment is not limited to this, and does not necessarily have to include protruding portion 411b.

[0045] Furthermore, in the stator core 41 according to the embodiment described above, the two ends 411a1, 411a2 are arranged in a portion where the protruding portion 411b is located in the circumferential direction C of the main body 411a. However, the stator core 41 according to the present embodiment is not limited to this. For example, the stator core 41 may have the two ends 411a1, 411a2 arranged on the main body 411a at a position away from the protruding portion 411b in the circumferential direction C of the main body 411a1.

[0046] [First Modification of the First Embodiment] Next, a stator core 41A according to a first modified example of the first embodiment will be described with reference to Figs. 5, 6, 7, 8, and 9. Fig. 5 is a perspective view showing a stator core 41A according to a first modified example of the first embodiment. Fig. 6 is a perspective view showing an assembly of a first core (outer core 411A) in the stator core 41A shown in Fig. 5. Fig. 7 is a perspective view showing an assembly of a first core (outer core 411A) in the stator core 41A shown in Fig. 5. Fig. 8 is a perspective view showing an assembly of a first core (outer core 411A) in the stator core 41A shown in Fig. 5. Fig. 9 is a perspective view showing a first core (outer core 411A) in the stator core 41A shown in Fig. 5.

[0047] In a stator core 41A according to this modification, an outer core 411A shown in FIG.

[0048] 6 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two end portions 4111a1, 4111a2 facing each other in the circumferential direction C of each of the plurality of plate materials constituting the first partial core 4111 shown in FIG.

[0049] In the first partial core 4111 according to this modification, the two ends 4111a1, 4111a2 facing each other in the circumferential direction C are disposed in a portion where the protruding portion 411b is disposed in the circumferential direction C. The thickness in the radial direction R of the main body 411a where the protruding portion 411b is disposed is greater than the thickness in the radial direction R of the main body 411a where the protruding portion 411b is not disposed. This makes it possible to increase the contact area between the two ends 4111a1, 4111a2.

[0050] The method of assembling stator core 41A according to the first modified example described below is also applicable to stator core 41 according to the above-mentioned first embodiment.

[0051] Then, the worker applies an external force to the main body 411a to elastically deform the main body 411a so that a gap is formed between one end 4111a1 and the other end 4111a2 in the circumferential direction C of the first partial core 4111. Therefore, a gap is formed between the contact surface 411bi and the outer end surface 412ao. After that, the worker places the inner core 412 on the rotor side R1 in the radial direction R of the first partial core (partial core) 4111, and then releases the external force to elastically restore the main body 411a of the first partial core 4111, and makes the one end 4111a1 and the other end 4111a2 face each other in the circumferential direction C.

[0052] 7 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two end portions 4112a1, 4112a2 facing each other in the circumferential direction C of each of the plurality of plate materials constituting the second partial core 4112 shown in FIG.

[0053] Then, the worker applies an external force to the main body 411a to elastically deform the main body 411a so that a gap is formed between one end 4112a1 and the other end 4112a2 in the circumferential direction C of the second partial core 4112 shown in FIG. 9. Therefore, a gap is formed between the contact surface 411bi and the outer end surface 412ao. After that, the worker places the inner core 412 on the rotor side R1 in the radial direction R of the second partial core (partial core) 4112, and then releases the external force to elastically restore the main body 411a of the second partial core 4112, so that one end 4112a1 and the other end 4112a2 face each other in the circumferential direction C. In addition, the first partial core 4111 and the second partial core 4112 are in contact with each other in the axial direction.

[0054] In this case, one end 4112a1 of the second partial core 4112 and one end 4111a1 of the first partial core 4111 are arranged at the same position in the circumferential direction C, and the other end 4112a2 of the second partial core 4112 and the other end 4111a2 of the first partial core 4111 are arranged at the same position in the circumferential direction C. In other words, two ends 4111a1, 4111a2, 4112a1, 4112a2 facing each other in the circumferential direction C of each of the multiple partial cores 4111, 4112 constituting the outer core 411A are arranged at the same position in the circumferential direction C.

[0055] Moreover, during the above-mentioned work, the multiple protrusions 411b and the multiple teeth 412a are arranged to face each other in the radial direction R. This work is performed in the same manner, although a description thereof will be omitted below.

[0056] The third partial core (partial core) 4113 shown in Fig. 8 is formed by arranging a plurality of the above-mentioned plate materials (parts) in the axial direction A. Two end portions 4113a1, 4113a2 opposing each other in the circumferential direction C of each of the plurality of plate materials constituting the third partial core 4113 shown in Fig. 9 are disposed at the same position in the circumferential direction C.

[0057] Then, the worker performs the same operation as for the second partial core 4112 to place the third partial core 4113 on the opposite side R2 in the radial direction R of the inner core 412.

[0058] 8 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two end portions 4114a1, 4114a2 opposing each other in the circumferential direction C of the plurality of plate materials constituting the fourth partial core 4114 shown in FIG.

[0059] Then, the worker performs the same operation as for the second partial core 4112 to place the fourth partial core 4114 on the opposite side R2 in the radial direction R of the inner core 412.

[0060] 5 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two ends 4115a1, 4115a2 opposing each other in the circumferential direction C of the plurality of plate materials constituting the fifth partial core 4115 shown in FIG.

[0061] Then, the worker performs the same operation as for the second partial core 4112 to place the fifth partial core 4115 on the opposite side R2 in the radial direction R of the inner core 412. Through the above-mentioned operation, the stator core 41A can be assembled.

[0062] In the stator core 41A according to this modification, two ends of each of the multiple partial cores 4111, 4112, 4113, 4114, and 4115 constituting the outer core 411A that face each other in the circumferential direction C are disposed at the same position in the circumferential direction C. This improves the ease of operation when applying an external force to the partial cores 4111, 4112, 4113, 4114, and 4115.

[0063] Furthermore, in the stator core 41A according to this modified example, multiple partial cores are individually assembled to the inner core 412, so that the magnitude of the external force required when assembling one partial core can be reduced, thereby improving workability.

[0064] In the stator core 41A according to this modification, the outer core 411A includes five partial cores. However, the outer core 411A according to this modification is not limited to this, and may include two or more partial cores.

[0065] [Second Modification of the First Embodiment] Next, the outer core 411B of the stator core 41B according to the second modified example of the first embodiment will be described with reference to FIG. 10. FIG. 10 is a perspective view showing the outer core 411B, which is the first core of the stator core 41B according to the second modified example of the first embodiment. In the configuration of the stator core 41B according to the second modified example of the first embodiment, differences from the configuration of the stator core 41 according to the first embodiment and the stator core 41A according to the first modified example will be described below, and the same configuration will be assigned the same reference numerals and description will be omitted. Note that the stator core 41B according to this modified example has the same inner core as the inner core 412 according to the first embodiment, so the description of the configuration of the inner core will be omitted.

[0066] In a stator core 41B according to this modification, an outer core 411B is formed by arranging a plurality of partial cores 4111, 4112, 4113, 4114, and 4115 in the axial direction A.

[0067] One end 4112a1 of the second partial core 4112 and one end 4111a1 of the first partial core 4111 are disposed at different positions in the circumferential direction C, and the other end 4112a2 of the second partial core 4112 and the other end 4111a2 of the first partial core 4111 are disposed at different positions in the circumferential direction C. In other words, two ends 4111a1, 4111a2, 4112a1, 4112a2 facing each other in the circumferential direction C of each of the multiple partial cores 4111, 4112 constituting the outer core 411B are disposed at different positions in the circumferential direction C.

[0068] At this time, the two ends 4111a1, 4111a2, 4112a1, 4112a2 of the multiple partial cores 4111, 4112 facing each other in the circumferential direction C are disposed at different positions in the circumferential direction C, but the multiple protrusions 411b and the multiple teeth 412a are disposed to face each other in the radial direction R. This operation is performed in a similar manner, although a description thereof will be omitted below.

[0069] One end 4113a1 of the third partial core 4113 and one end 4112a1 of the second partial core 4112 are disposed at different positions in the circumferential direction C, and the other end 4113a2 of the third partial core 4113 and the other end 4112a2 of the second partial core 4112 are disposed at different positions in the circumferential direction C. In other words, the two ends 4112a1, 4112a2, 4113a1, 4113a2 facing each other in the circumferential direction C of each of the multiple partial cores 4112, 4113 constituting the outer core 411B are disposed at different positions in the circumferential direction C.

[0070] One end 4114a1 of the fourth partial core 4114 and one end 4113a1 of the third partial core 4113 are disposed at different positions in the circumferential direction C, and the other end 4114a2 of the fourth partial core 4114 and the other end 4113a2 of the third partial core 4113 are disposed at different positions in the circumferential direction C. In other words, the two ends 4113a1, 4113a2, 4114a1, 4114a2 facing each other in the circumferential direction C of each of the multiple partial cores 4113, 4114 constituting the outer core 411B are disposed at different positions in the circumferential direction C.

[0071] One end 4115a1 of the fifth partial core 4115 and one end 4114a1 of the fourth partial core 4114 are disposed at different positions in the circumferential direction C, and the other end 4115a2 of the fifth partial core 4115 and the other end 4114a2 of the fourth partial core 4114 are disposed at different positions in the circumferential direction C. In other words, the two ends 4114a1, 4114a2, 4115a1, 4115a2 facing each other in the circumferential direction C of each of the multiple partial cores 4114, 4115 constituting the outer core 411B are disposed at different positions in the circumferential direction C.

[0072] In the stator core 41B according to this modification, two ends of each of the multiple partial cores 4111, 4112, 4113, 4114, and 4115 constituting the outer core 411B that face each other in the circumferential direction C are disposed at different positions in the circumferential direction C. Therefore, in the partial cores 4111, 4112, 4113, 4114, and 4115, the positions of the two ends that face each other in the circumferential direction C can be shifted in the circumferential direction C. As a result, the positions of the two ends at which a gap may occur can be shifted in the circumferential direction C.

[0073] [Second embodiment] Next, the stator core 41D according to the second embodiment will be described with reference to FIGS. 11, 12, and 13. FIG. 11 is a plan view of a motor 1D having a stator core 41D according to the second embodiment. FIG. 12 is an exploded perspective view of the stator core 41D shown in FIG. 11. FIG. 13 is a partially enlarged view showing a part of the first core (inner core 411D) when assembling the stator core 41D shown in FIG. 12. In the configuration of the motor 1D according to the second embodiment, differences from the configuration of the motor 1 according to the first embodiment will be described below, and the same configuration will be assigned the same reference numerals and description will be omitted. In FIG. 11, the x's on both sides of the teeth 412aD are shown without showing the windings wound around the teeth 412aD to form the coils 42.

[0074] The motor 1D according to the second embodiment is an outer rotor type in which, when viewed from the axial direction A, the rotor 3D is taken as a reference, the stator 4D is located inside the rotor 3D in the radial direction R, and the shaft (not shown) is located inside the stator 4D in the radial direction R. Therefore, in the stator 4D according to this embodiment, the outside in the radial direction R (the other side in the radial direction) is referred to as the rotor side R12 in the radial direction R, and the inside in the radial direction R (one side in the radial direction) is referred to as the opposite side R11 in the radial direction R.

[0075] The stator 4D includes a stator core 41D and a plurality of coils .

[0076] Stator core 41D is formed of a magnetic material such as a silicon steel plate. In other words, stator core 41D has magnetism. Stator core 41D includes inner core 411D, which is a first core, and outer core 412D, which is a second core. In stator core 41D according to the present embodiment, inner core 411D and outer core 412D are formed separately.

[0077] The inner core 411D is formed in a ring shape having two ends, and is located on the opposite side R11 of the outer core 412D in the radial direction R. The inner core 411D is formed by stacking, in the axial direction A, plate materials having the same magnetic properties as the outer core 411 of the first embodiment.

[0078] The inner core 411D has a main body 411aD and a protruding portion 411bD when viewed from the axial direction A. The main body 411aD is formed in a ring shape having two end portions when viewed from the axial direction A.

[0079] The main body 411aD has an outer circumferential surface (peripheral surface) 411ao located on the rotor side R12 in the radial direction R, and an inner circumferential surface 411ai located on the opposite side R11 in the radial direction R. A contact surface 411boD of the main body 411aD, which will be described later, faces one inner end surface (tip surface) 412aiD of each of the multiple teeth 412aD in the radial direction R.

[0080] The main body 411aD is formed to be continuous with respect to the circumferential direction C and is formed to be elastically deformable. The main body 411aD also has two end portions 411a1D, 411a2D that face each other in the circumferential direction C. Each of the end portions 411a1D, 411a2D includes, for example, a plane that extends in the axial direction A and also in the radial direction R, and these two planes become two opposing surfaces that face each other in the circumferential direction C.

[0081] According to this embodiment, two ends 411a1D, 411a2D facing each other in the circumferential direction C are disposed on a main body 411aD. In addition, holes H1, H2 are formed near the two ends 411a1D, 411a2D facing each other in the circumferential direction C, respectively.

[0082] The protruding portion 411bD protrudes from an outer circumferential surface 411ao of the main body 411aD toward the rotor side R12 in the radial direction R. Each of the protruding portions 411bD has a contact surface 411boD that comes into contact with an inner end surface 412aiD (tip surface) on one side of each of the multiple teeth 412aD.

[0083] Each of the teeth 412aD extends from one side to the other side in the radial direction R. More specifically, each of the teeth 412aD has a base end portion 412bD extending in the circumferential direction C at a tip end of the other side (in this embodiment, the rotor side R12 in the radial direction R), and the base ends 412bD of the multiple teeth 412aD are connected in the circumferential direction C. In other words, the base end portion 412bD is formed in an annular shape when viewed from the axial direction A.

[0084] The base end 412bD has an outer circumferential surface 412bo located on the rotor side R12 in the radial direction R, and an inner circumferential surface 412bi located on the opposite side R11 in the radial direction R.

[0085] Each of the multiple teeth 412aD has an inner end surface 412aiD on one side in the radial direction R. The inner end surface 412aiD faces in the radial direction R a contact surface 411boD of an inner core 411D which is a first core.

[0086] Next, regarding the assembly of the stator core 41D, first, the worker winds the coil 42 around the teeth 412aD, and then places the inner core 411D on one side in the axial direction A with respect to the outer core 412D.

[0087] In the main body 411aD according to this embodiment, when no external force is applied, a small gap is formed between one end 411a2D and the other end 411a2D in the radial direction R. Next, as shown in Fig. 13, the worker applies an external force to the main body 411aD to elastically deform it so that a larger gap is formed between one end 411a2D and the other end 411a2D in the radial direction R than when no external force is applied. Transform.

[0088] More specifically, the worker inserts one end of the first jig into a hole H1 formed near one end 411a1D, and inserts the end of the second jig into a hole H2 formed near the other end 411a2D. After that, the worker elastically deforms the main body 411aD by applying an external force in the circumferential direction C between the one end 411a1D and the other end 411a2D so that the above-mentioned large gap is formed. Therefore, a gap is formed between the contact surface 411boD and the inner end surface 412aiD.

[0089] Next, the operator moves the inner core 411D to the other side in the axial direction A relative to the outer core 412D.

[0090] Next, when the worker releases the external force, an elastic restoring force F2 acts on the main body 411aD in the circumferential direction C, causing one end 411a1D and the other end 411a2D to face or come into contact with each other in the circumferential direction C with a small gap therebetween.

[0091] When one end 411a1D and the other end 411a2D are facing or in contact with each other in the circumferential direction C with a small gap between them, the contact surfaces 411boD of the multiple protrusions 411bD come into contact with the inner end surfaces 412aiD of the multiple teeth 412aD, allowing the outer core 412D to be assembled to the inner core 411D, and the stator core 41D can be assembled.

[0092] The stator core 41D according to this embodiment includes an inner core (first core) 411D having two ends 411a1D, 411a2D facing each other in the circumferential direction C and an outer core (second core) 412D having a ring-shaped elastically deformable inner core 411D and a plurality of teeth 412aD extending from one side to the other side in the radial direction R. Each of the plurality of teeth 412aD has a base end 412bD extending in the circumferential direction C at the tip of the other side. The base ends 412bD of the plurality of teeth 412aD are connected in the circumferential direction C. An inner end surface (tip surface) 412aiD on one side of each of the plurality of teeth 412aD contacts the circumferential surface (contact surface 411boD of the protruding portion 411bD) on the other side of the inner core 411D. Moreover, the inner core 411D can be inserted into the opposite side R11 in the radial direction R of the outer core 412D in a state in which the two ends 411a1D and 411a2D of the inner core 411D facing each other in the circumferential direction C are facing or in contact with a small gap. Therefore, when the inner core 411D is moved in the axial direction A relative to the outer core 412D, the contact surface 411boD of the protruding portion 411bD and the inner end surface 412aiD of the tooth 412aD can be prevented from coming into contact with each other. As a result, the friction between the contact surface 411boD and the inner end surface 412aiD can be prevented. As described above, the stator core 41D can be assembled without going through a special process, and the manufacturing equipment can be simplified. In other words, according to the stator core 41D according to this embodiment, the time required to manufacture one stator core 41D (so-called tact time) can be shortened.

[0093] Moreover, the inner core 411D according to this embodiment has been described as including the main body 411aD and the protruding portion 411bD. However, the outer core 411 according to this embodiment is not limited to this, and does not necessarily have to include the protruding portion 411bD.

[0094] [First Modification of the Second Embodiment] Next, a stator core 41E according to a first modified example of the second embodiment will be described with reference to FIG. 14. FIG. 14 is a perspective view showing an inner core 411E of a stator core 41E according to a first modified example of the second embodiment. In the configuration of the stator core 41E according to the first modified example of the second embodiment, differences from the configuration of the stator core 41D according to the second embodiment will be described below, and the same configuration will be assigned the same reference numerals and description will be omitted. Note that the stator core 41E according to this modification has an outer core that is the same as the outer core 412D according to the second embodiment, and therefore description of the configuration of the outer core will be omitted.

[0095] In a stator core 41E according to this modification, an inner core 411E is formed by arranging partial cores 4116, 4117, 4118, 4119, and 4110 in the axial direction A.

[0096] The first partial core (partial core) 4116 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two ends 4116a1, 4116a2 facing each other in the circumferential direction C of each of the plurality of plate materials constituting the first partial core 4116 are disposed at the same position in the circumferential direction C.

[0097] The second partial core (partial core) 4117 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two ends 4117a1, 4117a2 facing each other in the circumferential direction C of each of the plurality of plate materials constituting the second partial core 4117 are disposed at the same position in the circumferential direction C.

[0098] The third partial core (partial core) 4118 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two end portions 4118a1, 4118a2 facing each other in the circumferential direction C of each of the plurality of plate materials constituting the third partial core 4118 are disposed at the same position in the circumferential direction C.

[0099] The fourth partial core (partial core) 4119 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two ends 4119a1, 4119a2 opposing each other in the circumferential direction C of each of the plurality of plate materials constituting the fourth partial core 4119 are disposed at the same position in the circumferential direction C.

[0100] The fifth partial core (partial core) 4110 is formed by arranging a plurality of the above-mentioned plate materials (portions) in the axial direction A. Two ends 4110a1, 4110a2 opposing each other in the circumferential direction C of each of the plurality of plate materials constituting the fifth partial core 4110 are disposed at the same position in the circumferential direction C.

[0101] In a stator core 41E according to this modification, two ends of each of the multiple partial cores 4116, 4117, 4118, 4119, and 4110 constituting an inner core 411E that face each other in the circumferential direction C are disposed at the same position in the circumferential direction C. This improves the ease of operation when applying an external force to the partial cores 4116, 4117, 4118, 4119, and 4110.

[0102] In the stator core 41E according to this modification, the inner core 411E includes five partial cores. However, the inner core 411E according to this modification is not limited to this, and may include two or more partial cores.

[0103] [Second Modification of the Second Embodiment] Next, a stator core 41F according to a second modified example of the second embodiment will be described with reference to FIG. 15. FIG. 15 is a perspective view showing an inner core 411F of a stator core 41F according to a second modified example of the second embodiment. In the configuration of the stator core 41F according to the second modified example of the second embodiment, differences from the configuration of the stator core 41D according to the second embodiment will be described below, and the same configuration will be assigned the same reference numerals and description will be omitted. Note that the stator core 41F according to this modification has an outer core that is the same as the outer core 412D according to the second embodiment, and therefore description of the configuration of the outer core will be omitted.

[0104] In a stator core 41F according to this modification, an inner core 411F is formed by arranging a plurality of partial cores 4116, 4117, 4118, 4119, and 4110 in the axial direction A.

[0105] One end 4117a1 of the second partial core 4117 and one end 4116a1 of the first partial core 4116 are disposed at different positions in the circumferential direction C, and the other end 4117a2 of the second partial core 4117 and the other end 4116a2 of the first partial core 4116 are disposed at different positions in the circumferential direction C. In other words, the two ends 4116a1, 4116a2, 4117a1, 4117a2 facing each other in the circumferential direction C of each of the multiple partial cores 4116, 4117 constituting the inner core 411F are disposed at different positions in the circumferential direction C.

[0106] One end 4118a1 of the third partial core 4118 and one end 4117a1 of the second partial core 4117 are disposed at different positions in the circumferential direction C, and the other end 4118a2 of the third partial core 4118 and the other end 4117a2 of the second partial core 4117 are disposed at different positions in the circumferential direction C. In other words, the two ends 4117a1, 4117a2, 4118a1, 4118a2 facing each other in the circumferential direction C of each of the multiple partial cores 4117, 4118 constituting the inner core 411F are disposed at different positions in the circumferential direction C.

[0107] One end 4119a1 of the fourth partial core 4119 and one end 4118a1 of the third partial core 4118 are disposed at different positions in the circumferential direction C, and the other end 4119a2 of the fourth partial core 4119 and the other end 4118a2 of the third partial core 4118 are disposed at different positions in the circumferential direction C. In other words, the two ends 4118a1, 4118a2, 4119a1, 4119a2 facing each other in the circumferential direction C of each of the multiple partial cores 4118, 4119 constituting the inner core 411F are disposed at different positions in the circumferential direction C.

[0108] One end 4110a1 of the fifth partial core 4110 and one end 4119a1 of the fourth partial core 4119 are disposed at different positions in the circumferential direction C, and the other end 4110a2 of the fifth partial core 4110 and the other end 4119a2 of the fourth partial core 4119 are disposed at different positions in the circumferential direction C. In other words, the two ends 4119a1, 4119a2, 4110a1, 4110a2 facing each other in the circumferential direction C of each of the multiple partial cores 4119, 4110 constituting the inner core 411F are disposed at different positions in the circumferential direction C.

[0109] In a stator core 41F according to this modification, two ends of each of the multiple partial cores 4116, 4117, 4118, 4119, and 4110 constituting an inner core 411F that face each other in the circumferential direction C are disposed at different positions in the circumferential direction C. Therefore, in the partial cores 4116, 4117, 4118, 4119, and 4110, the positions of the two ends that face each other in the circumferential direction C can be shifted in the circumferential direction C. As a result, the positions of the two ends at which a gap may occur can be shifted in the circumferential direction C.

[0110] Although the partial core has been described as having five stages as shown in Fig. 5, the number of stages is not limited to five. For example, by using six stages, when the teeth have 12 slots, the offset can be distributed evenly.

[0111] The above has been described based on the embodiments and modifications of the stator cores 41, 41A, 41B, 41D, 41E, 41F, etc. according to the present invention, but the present invention is not limited to the embodiments and modifications, and it goes without saying that various modifications are possible within the scope of the present invention. The present invention also includes configurations in which the components of the above-mentioned embodiments and the components of the modifications are appropriately combined. Such modifications that do not depart from the scope of the present invention are also included in the technical scope of the present invention, and this is clear to those skilled in the art from the description of the claims. [Explanation of symbols]

[0112] 1, 1D, motor, 3, 3D rotor, 41, 41A, 41B, 41D, 41E, 41F stator core, 411 outer core (first core), 411D inner core (first core), 411b, 411bD protrusion, 411ai inner circumferential surface (circumferential surface), 411bi, 411boD contact surface, 411ao outer circumferential surface (circumferential surface), 412 inner core (second core), 412a, 412aD teeth, 412aiD inner end surface (tip surface), 412ao outer end surface (tip surface), 412b, 412bD base end portion, 412D outer core (second core), 411a1, 411a2, 4111a1, 4111a2, 4112a1, 4112a2, 4113a1, 4113a2, 4114a1, 4114a2, 4115a1, 4115a2, 4116a1, 4116a2, 4117a1, 4117a2, 4118a1, 4118a2, 4119a1, 4119a2, 4110a1, 4110a2 End, 4111, 4112, 4113, 4114, 4115, 4116, 4117, 4118, 4119, 4110 Partial core, A axial direction, C circumferential direction, R radial direction

Claims

1. a first core having a ring shape and two ends opposed to each other in a circumferential direction; a second core having a plurality of teeth extending from one radial side to the other radial side; Equipped with Each of the plurality of teeth has a base end portion extending in the circumferential direction at a tip end on the other side, base ends of the teeth are connected in the circumferential direction, a tip surface on the one side of each of the plurality of teeth contacts a peripheral surface on the other side of the first core; Stator core.

2. A plurality of protrusions are formed on a peripheral surface of the first core that faces the tip end surfaces on the one side of each of the plurality of teeth, Each of the plurality of protrusions has a contact surface that contacts a tip end surface on the one side of each of the plurality of teeth. The stator core according to claim 1 .

3. The first core is formed by arranging a plurality of ring-shaped portions, each having two ends opposed to each other in the circumferential direction, in the axial direction. The stator core according to claim 2 .

4. The first core is formed by arranging a plurality of partial cores in the axial direction, the partial cores being each formed by arranging a plurality of the portions in the axial direction, two ends of each of the plurality of portions constituting the partial core, the two ends facing each other in the circumferential direction, are disposed at the same position in the circumferential direction, two ends of each of the partial cores constituting the first core, the two ends facing each other in the circumferential direction, are disposed at different positions in the circumferential direction. The stator core according to claim 3 .

5. A stator core according to any one of claims 1 to 4, A rotor; A motor comprising:

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