Stator core and motor

Abstract

To prevent detachment of one core from the other core.SOLUTION: A stator core comprises: a ring-shaped first core; 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 plurality of protrusions are formed on a circumferential surface of the first core which faces a tip end surface on the one side of each of the plurality of teeth. The plurality of protrusions each have a contact surface which comes into contact with the tip end surface on the one side of each of the plurality of teeth. The contact surface has two inclined surfaces which intersect each other. The two inclined surfaces intersect each other in a manner being recessed to one side in the radial direction, or they intersect each other in a manner protruding to the other side in the radial direction.SELECTED DRAWING: Figure 5

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] Then, the outer core is rotated in the 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 preventing one of the outer core and the inner core from coming loose from the other core.

[0007] The present invention has been made in consideration of the above, and has an object to provide a stator core that can prevent the core from coming off. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, a stator core according to the present invention includes a ring-shaped first core and a second core having a plurality of teeth extending from one side to the other side in a radial direction. Each of the plurality of teeth has a base end portion extending in a circumferential direction at a tip end on the other side. The base ends of the plurality of teeth are connected in the circumferential direction. A plurality of protrusions are formed on the peripheral surface of the first core facing the tip end faces on the one side of each of the plurality of teeth. Each of the plurality of protrusions has a contact surface that contacts the tip end face on the one side of each of the plurality of teeth. The contact surfaces include two intersecting inclined surfaces. The two inclined surfaces intersect so as to be recessed toward one side in the radial direction, or intersect so as to protrude toward the other side in the radial direction.

[0009] According to one aspect of the stator core of the present invention, it is possible to prevent the core from coming off. [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 partial enlarged view showing the assembly of the stator core shown in FIG. [Figure 4] FIG. 4 is a partially enlarged view showing a part of FIG. [Diagram 5] FIG. 5 is an enlarged plan view showing a portion of the first core and the second core shown in FIG. [Figure 6] FIG. 6 is an enlarged plan view showing a part of a stator core according to a first modified example of the first embodiment. [Figure 7] FIG. 7 is a partial enlarged view showing the assembly of the stator core shown in FIG. [Figure 8] FIG. 8 is a plan view of a motor having a stator core according to the second embodiment. [Figure 9] FIG. 9 is an exploded perspective view of the stator core shown in FIG. [Figure 10] FIG. 10 is an enlarged plan view showing a part of the stator core according to the second embodiment. [Figure 11] FIG. 11 is a partial enlarged view showing the assembly of the stator core shown in FIG. [Figure 12] FIG. 12 is an enlarged plan view showing a part of a stator core according to a first modified example of the second embodiment. [Figure 13] FIG. 13 is a partial enlarged view showing the assembly of the stator core shown in FIG. 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. Note that the dimensional relationships and ratios of elements in the drawings may differ from the reality. The dimensional relationships and ratios of elements may differ between the drawings.

[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 partially enlarged view showing the assembly of the stator core 41 shown in FIG. 2. FIG. 4 is a partially enlarged view showing a part of FIG. 3. FIG. 5 is an enlarged plan view showing a part of the first core (outer core 411) and the second core (inner core 412) shown in FIG. 1. In FIG. 1, the x's on both sides of teeth 412a, which will be described later, are used to omit windings that are wound around teeth 412a to form coils 42.

[0013] 1 to 5 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.

[0025] When viewed from the axial direction A, the outer core 411 shown in FIG. 2 has a main body 411a formed in a ring shape 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 protruding portion 411b protrudes from an inner peripheral 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 teeth 412a. Furthermore, the protruding portion 411b has a pair of side surfaces 411bf that face each other in the circumferential direction C when viewed from the axial direction A (hereinafter referred to as "when viewed from above") (see FIG. 4).

[0028] The contact surface 411bi shown in FIG. 4 has a first inclined surface bi1 and a second inclined surface bi2 in top view.

[0029] In addition, when viewed from above, the intersection angle between the first inclined surface bi1 and a parallel line L1 that is parallel to a virtual line along the radial direction R is α1.

[0030] Furthermore, in the top view, the intersection angle between the second inclined surface bi2 and the parallel line L1 is β1.

[0031] The contact surface 411bi has intersecting portions bi1e and bi2e intersecting with a pair of side surfaces 411bf in a top view. The intersecting portion bi1e is a portion where the first inclined surface bi1 intersects with the side surface 411bf on the reverse rotation direction side C1, and the intersecting portion bi2e is a portion where the second inclined surface bi2 intersects with the side surface 411bf on the rotation direction side C2. The intersecting portion bi1e is located closer to the rotor side R1 in the radial direction R than the intersecting portion bi2e. As a result, a virtual inclined surface passing through the intersecting portions bi1e and bi2e has an inclination that rises to the right in FIG. 4. Furthermore, the intersecting portion 411bc of the contact surface 411bi is located on one side in the radial direction R (i.e., the opposite side R2 in the radial direction R) with respect to the virtual inclined surface passing through the intersecting portions bi1e and bi2e.

[0032] In other words, a portion 411bc where the two inclined surfaces bi1, bi2 of the contact surface 411bi intersect (hereinafter referred to as an intersection portion) is recessed toward one side in the radial direction R (that is, recessed toward the opposite side R2 in the radial direction R).

[0033] In addition, in the circumferential direction C of the stator core 41 according to this embodiment, the intersection portion 411bc is closer to the side surface 411bf on the reverse rotation direction side C1 than to the side surface 411bf on the rotation direction side C2. Therefore, the length of the second inclined surface bi2 is longer than that of the first inclined surface bi1, and the intersection angle α1 and the intersection angle β1 are different. More specifically, the intersection angle α1 is larger than the intersection angle β1. As a result, the inclination of the second inclined surface bi2 is gentler than the inclination of the first inclined surface bi1.

[0034] Each of the teeth 412a extends from one side, that is, the outer side, 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 in the circumferential direction C. In other words, the base ends 412b are formed in an annular shape when viewed from the axial direction A. Furthermore, each of the teeth 412a has a pair of side surfaces 412af facing each other in the circumferential direction C in a top view (see FIG. 4).

[0035] 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.

[0036] 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.

[0037] The outer end surface 412ao shown in FIG. 4 has a third inclined surface ao3 and a fourth inclined surface ao4 in top view.

[0038] Moreover, when viewed from above, the intersection angle between the third inclined surface ao3 and the parallel line L1 is γ1.

[0039] Furthermore, in the top view, the intersection angle between the fourth inclined surface ao4 and the parallel line L1 is δ1.

[0040] The outer end surface 412ao has intersection parts ao3e and ao4e intersecting with a pair of side surfaces 412af in a top view. The intersection part ao3e is a part where the third inclined surface ao3 intersects with the side surface 412af on the reverse rotation direction side C1, and the intersection part ao4e is a part where the fourth inclined surface ao4 intersects with the side surface 412af on the rotation direction side C2. The intersection part ao3e is located closer to the rotor side R1 in the radial direction R than the intersection part ao4e. As a result, a virtual inclined surface passing through the intersection parts ao3e and ao4e has an inclination that rises to the right in FIG. 4. Furthermore, the intersection part 412ac of the outer end surface 412ao is located on one side in the radial direction R (i.e., the opposite side R2 in the radial direction R) with respect to the virtual inclined surface passing through the intersection parts ao3e and ao4e.

[0041] In other words, an intersection portion 412ac where the two inclined surfaces ao3, ao4 of the outer end surface 412ao intersect protrudes to one side in the radial direction R. (That is, it protrudes to the opposite side R2 in the radial direction R).

[0042] In addition, in the circumferential direction C of the stator core 41 according to this embodiment, the intersection portion 412ac is closer to the side surface 412af on the reverse rotation direction side C1 than to the side surface 412af on the rotation direction side C2. Therefore, the length of the fourth inclined surface ao4 is longer than that of the third inclined surface ao3, and the intersection angles γ1 and δ1 are different. More specifically, the intersection angle γ1 is smaller than the intersection angle δ1. As a result, the inclination of the fourth inclined surface ao4 is gentler than the inclination of the third inclined surface ao3.

[0043] Next, the assembly of the stator core 41 will be described with reference to Figures 2, 4, and 5. 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.

[0044] Next, the worker moves the outer core 411 to the other side in the axial direction A relative to the inner core 412, and positions the outer core 411 on the opposite side R2 in the radial direction R of the inner core 412 so that at least the first inclined surface bi1 and the third inclined surface ao3 are not opposed to each other in the radial direction R.

[0045] Next, the worker moves the outer core 411 relative to the inner core 412 in the circumferential direction C (more specifically, in the rotational direction C2) as indicated by an arrow F1 in FIG.

[0046] Then, as shown in Figure 5, the second inclined surface bi2 comes into contact with the fourth inclined surface ao4, and the first inclined surface bi1 comes into contact with the third inclined surface ao3, so that the inner core 412 can be assembled to the outer core 411, and the stator core 41 can be assembled.

[0047] 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.

[0048] The stator core 41 according to the present embodiment includes a ring-shaped outer core 411 and an inner core 412 having a plurality of teeth 412a extending from one side to the other side in the radial direction R. Moreover, in the stator core 41, each of the plurality of teeth 412a has a base end portion 412b extending in the circumferential direction C at the tip end on the other side, and the base end portions 412b of the plurality of teeth 412a are connected in the circumferential direction C. A plurality of protrusions 411b are formed on an inner peripheral surface (peripheral surface) 411ai of the outer core (first core) 411. Furthermore, in the stator core 41, each of the plurality of protrusions 411b has a contact surface 411bi that contacts an outer end surface (tip end surface) 412ao on one side of each of the plurality of teeth 412a, and the contact surface 411bi includes two intersecting inclined surfaces bi1 and bi2. The two inclined surfaces bi1 and bi2 intersect so as to be recessed toward one side of the radial direction R.

[0049] In addition, in the stator core 41 according to this embodiment, the inclined surface bi2 is moved in the circumferential direction C facing the third inclined surface ao3 during assembly, so that the assembly work is easy. In the stator core 41 according to this embodiment, in a state in which the first inclined surface bi1 and the third inclined surface ao3 are in contact with each other and the second inclined surface bi2 and the fourth inclined surface ao4 are in contact with each other, in order for the teeth 412a to move toward the reverse rotation direction side C1, the intersection portion 412ac must overcome the first inclined surface bi1, which has a steep inclination and includes the intersection portion bi1e. Therefore, in order for the teeth 412a to move toward the reverse rotation direction side C1, a large force is required to elastically deform the protruding portion 411b including the first inclined surface bi1, so that the movement of the teeth 412a toward the reverse rotation direction side C1 can be suppressed. As described above, according to this embodiment, the stator core 41 can be assembled without going through a special process, and thus the manufacturing equipment can be simplified. In other words, the stator core 41 according to this embodiment can shorten the time (so-called tact time) required to manufacture one stator core 41. Moreover, the stator core 41 according to this embodiment can prevent one of the outer core 411 and the inner core 412 from coming off relative to the other. In other words, the stator core 41 according to this embodiment can prevent one of the outer core 411 and the inner core 412 from coming off relative to the other.

[0050] Furthermore, the motor 1 according to this embodiment is, for example, a motor 1 used in a device such as a fan, and when the rotation direction of the rotor 3 relative to the stator 4 during driving is one side of the circumferential direction C (for example, the rotation direction side C1), the following actions and effects are achieved. When assembling the stator core 41, the outer core 411 is moved toward the rotation direction side C2 in the circumferential direction C relative to the inner core 412, so that the third inclined surface ao3 comes into contact with the first inclined surface bi1, and the fourth inclined surface ao4 comes into contact with the second inclined surface bi2, thereby assembling the outer core 411 to the inner core 412. Then, even when the motor 1 is driven, the rotor 3 is rotated toward the rotation direction side C1 in the circumferential direction C relative to the stator 4. That is, when the rotor 3 is rotated toward the rotation direction side C1, a torque is applied to the inner core 412 in the reverse rotation direction side C2. On the other hand, since a torque is applied to the outer core 411 in the direction of the rotational direction C1 relative to the inner core 412, movement in the direction of the rotational direction C1 can be suppressed. As a result, movement of the outer core 411 in the reverse rotational direction C2 in the circumferential direction C relative to the inner core 412 can be suppressed, and the outer core 411 can be suppressed from coming off the inner core 412.

[0051] In the stator core 41 according to this embodiment, an outer end surface (tip surface) 412ao of the inner core 412 is aligned along two inclined surfaces bi1, bi2 of the outer core 411.

[0052] The motor 1 according to this embodiment includes the stator core 41 and the rotor 3 described above.

[0053] In the motor 1 according to the first embodiment described above, the rotation direction of the rotor 3 relative to the stator 4 when driven is one side of the circumferential direction C. However, the motor 1 according to the present embodiment is not limited to this. For example, when the motor 1 is driven, the rotor 3 may rotate to one side of the circumferential direction C relative to the stator 4, and the rotor 3 may rotate to the other side of the circumferential direction C relative to the stator 4 in response to an appropriate switching operation.

[0054] In addition, in the stator core 41 according to the first embodiment described above, the intersecting angle α1 and the intersecting angle β1 are different. However, in the stator core 41 according to the present embodiment, the intersecting angle α1 and the intersecting angle β1 may be the same. The same applies to the intersecting angle γ1 and the intersecting angle δ1.

[0055] [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. 6 and 7. Fig. 6 is an enlarged plan view showing a part of the stator core 41A according to the first modified example of the first embodiment. Fig. 7 is a partially enlarged view showing the assembly of the stator core 41A shown in Fig. 6. In the configuration of the stator core 41A according to the first modified example of the first embodiment, differences from the configuration of the stator core 41 according to the first embodiment will be described below, and the same configuration will be denoted by the same reference numerals and description thereof will be omitted.

[0056] The protrusion 411bA shown in FIG. 7 has a pair of side surfaces 411bAf opposing each other in the circumferential direction C in a top view.

[0057] The contact surface 411biA shown in FIG. 6 has a first inclined surface bi1A and a second inclined surface bi2A when viewed from above.

[0058] In addition, when viewed from above, the first inclined surface bi1A intersects with the parallel line L1 at an angle of α2.

[0059] Furthermore, in the top view, the intersection angle between the second inclined surface bi2A and the parallel line L1 is β2.

[0060] The contact surface 411biA has intersecting portions bi1eA and bi2eA intersecting with a pair of side surfaces 411bAf in a top view. The intersecting portion bi1eA is a portion where the first inclined surface bi1A intersects with the side surface 411bAf on the reverse rotation direction side C1, and the intersecting portion bi2eA is a portion where the second inclined surface bi2A intersects with the side surface 411bAf on the rotation direction side C2. The intersecting portion bi2eA is located closer to the rotor side R1 in the radial direction R than the intersecting portion bi1eA. As a result, a virtual inclined surface passing through the intersecting portions bi1eA and bi2eA is inclined downward to the right in FIG. 7. Moreover, the intersecting portion 411bcA of the contact surface 411biA is located on the other side in the radial direction R (i.e., the rotor side R1 in the radial direction R) with respect to the virtual inclined surface passing through the intersecting portions bi1eA and bi2eA.

[0061] In other words, an intersection portion 411bcA where the two inclined surfaces bi1A, bi2A of the contact surface 411biA intersect protrudes to the other side in the radial direction R (that is, protrudes to the rotor side R1 in the radial direction R).

[0062] In addition, in the circumferential direction C of the stator core 41A according to this modification, the intersection portion 411bcA is closer to the side surface 411bAf on the rotation direction side C2 than to the side surface 411bAf on the reverse rotation direction side C1. Therefore, the length of the first inclined surface bi1A is longer than the length of the second inclined surface bi2A, and the intersection angle α2 and the intersection angle β2 are different. More specifically, the intersection angle α2 is smaller than the intersection angle β2. As a result, the inclination of the second inclined surface bi2A is gentler than the inclination of the first inclined surface bi1A.

[0063] Each of the teeth 412aA has a pair of side surfaces 412aAf opposing each other in the circumferential direction C in a top view. In addition, each of the plurality of teeth 412aA has an outer end surface 412aoA on one side in the radial direction R.

[0064] The outer end surface 412aoA has a third inclined surface ao3A and a fourth inclined surface ao4A in top view.

[0065] Moreover, in the top view, the intersection angle between the third inclined surface ao3A and the parallel line L1 is γ2.

[0066] Furthermore, in the top view, the intersection angle between the fourth inclined surface ao4A and the parallel line L1 is δ2.

[0067] The outer end surface 412aoA has intersections ao3eA and ao4eA intersecting with a pair of side surfaces 412aAf in a top view. The intersection ao3eA is a portion where the third inclined surface ao3A intersects with the side surface 412aAf on the reverse rotation direction side C1, and the intersection ao4eA is a portion where the fourth inclined surface ao4A intersects with the side surface 412aAf on the rotation direction side C2. The intersection ao4eA is located closer to the rotor side R1 in the radial direction R than the intersection ao3eA. As a result, a virtual inclined surface passing through the intersections ao3eA and ao4eA is inclined downward to the right in FIG. 7. Furthermore, the intersection 412acA of the outer end surface 412aoA is located on the other side in the radial direction R (i.e., the rotor side R1 in the radial direction R) with respect to the virtual inclined surface passing through the intersections ao3eA and ao4eA.

[0068] In other words, an intersection portion 412acA where the two inclined surfaces ao3A and ao4A of the outer end surface 412aoA intersect is recessed toward the other side in the radial direction R (that is, recessed toward the rotor side R1 in the radial direction R).

[0069] In addition, in the circumferential direction C of the stator core 41A according to this modification, the intersection portion 412acA is closer to the side surface 412aAf on the rotation direction side C2 than to the side surface 412aAf on the reverse rotation direction side C1. Therefore, the length of the third inclined surface ao3A is longer than the length of the fourth inclined surface ao4A, and the intersection angle γ2 and the intersection angle δ2 are different. More specifically, the intersection angle δ2 is smaller than the intersection angle γ2. As a result, the inclination of the fourth inclined surface ao4A is gentler than the inclination of the third inclined surface ao3A.

[0070] Next, the assembly of the stator core 41A will be described. First, after winding the coil 42 around the teeth 412aA, an operator places the outer core 411A on one side in the axial direction A relative to the inner core 412A.

[0071] Next, the worker moves the outer core 411A to the other side in the axial direction A relative to the inner core 412A, and positions the outer core 411A on the opposite side R2 in the radial direction R of the inner core 412A so that at least the second inclined surface bi2A and the fourth inclined surface ao4A are not opposed to each other in the radial direction R.

[0072] Next, as indicated by an arrow F2 in FIG. 7, the worker moves the outer core 411A in the circumferential direction C (more specifically, toward the reverse rotational direction C1) relative to the inner core 412A.

[0073] Then, as shown in FIG. 6, the second inclined surface bi2A comes into contact with the fourth inclined surface ao4A, and the first inclined surface bi1A comes into contact with the third inclined surface ao3A, so that the inner core 412A can be attached to the outer core 411A, and the stator core 41A can be assembled.

[0074] A stator core 41A according to this modification includes a ring-shaped outer core 411A and an inner core 412A having a plurality of teeth 412aA extending from one side to the other side in the radial direction R. Moreover, in the stator core 41A, each of the plurality of teeth 412aA has a base end portion 412b extending in the circumferential direction C at the tip end on the other side, and the base ends 412b of the plurality of teeth 412aA are connected in the circumferential direction C, and a plurality of protrusions 411bA are formed on an inner circumferential surface (circumferential surface) 411ai of the outer core (first core) 411A facing an outer end surface (tip end surface) 412aoA on one side of each of the plurality of teeth 412aA. Furthermore, in the stator core 41A, each of the multiple protrusions 411bA has a contact surface 411biA that contacts with one side outer end surface (tip surface) 412aoA of each of the multiple teeth 412aA, and the contact surface 411biA has two intersecting inclined surfaces bi1A and bi2A. The two inclined surfaces bi1A and bi2A intersect so as to protrude to the other side of the radial direction R. As described above, according to this modification, the stator core 41A 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 41A according to this modification, the time (so-called tact time) for manufacturing one stator core 41A can be shortened. Moreover, according to the stator core 41A according to this modification, it is possible to prevent one core from coming off from the other core in the outer core 411A and the inner core 412A. In other words, according to stator core 41A of this modification, it is possible to prevent one of outer core 411A and inner core 412A from coming loose with respect to the other.

[0075] [Second embodiment] Next, the stator core 41 and the like according to the second embodiment will be described with reference to FIGS. 8, 9, 10, and 11. FIG. 8 is a plan view of a motor 1B having a stator core 41B according to the second embodiment. FIG. 9 is an exploded perspective view of the stator core 41B shown in FIG. 8. FIG. 10 is an enlarged plan view showing a part of the stator core 41B according to the second embodiment. FIG. 11 is a partially enlarged view showing the assembly of the stator core 41B shown in FIG. 8. In the configuration of the motor 1B 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. 8, the x's on both sides of the teeth 412aB are shown omitting the windings wound around the teeth 412aB to form the coils 42.

[0076] 8 according to the second embodiment is an outer rotor type in which, when viewed from the axial direction A, the stator 4B is located inside the rotor 3B in the radial direction R, and the shaft (not shown) is located inside the stator 4B in the radial direction R, with the rotor 3B as the reference. Therefore, in the stator 4B according to this embodiment, the outer side in the radial direction R is referred to as the rotor side R12 in the radial direction R, and the inner side in the radial direction R is referred to as the opposite side R11 in the radial direction R.

[0077] The stator 4B shown in FIG. 8 includes a stator core 41B and a plurality of coils .

[0078] Stator core 41B is formed of a magnetic material such as a silicon steel plate. In other words, stator core 41B has magnetism. Stator core 41B includes inner core 411B which is a first core, and outer core 412B which is a second core. In stator core 41B according to the present embodiment, inner core 411B and outer core 412B are formed separately.

[0079] The inner core 411B is formed in a ring shape, and is located on the opposite side R11 in the radial direction R to the outer core 412B.

[0080] As shown in Fig. 9, when viewed from the axial direction A, the inner core 411B has a main body 411aB and a protruding portion 411bB. When viewed from the axial direction A, the main body 411aB is formed in a ring shape (see Fig. 8).

[0081] 9, the main body 411aB 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 411boB of the main body 411aB, which will be described later, faces one inner end surface (tip surface) 412aiB of each of the multiple teeth 412aB in the radial direction R.

[0082] The protruding portion 411bB protrudes from the outer circumferential surface 411ao of the main body 411aB toward the rotor side R12 in the radial direction R. Each of the protruding portions 411bB has a contact surface 411boB that comes into contact with an inner end surface 412aiB (tip surface) on one side of each of the teeth 412aB. Furthermore, the protruding portion 411bB has a pair of side surfaces 411bBf that face each other in the circumferential direction C in a top view (see FIG. 11).

[0083] The contact surface 411boB shown in FIG. 11 has a first inclined surface bo1B and a second inclined surface bo2B when viewed from above.

[0084] In addition, when viewed from above, the intersection angle between the first inclined surface bo1B and the parallel line L1 is α3.

[0085] Furthermore, in the top view, the intersection angle between the second inclined surface bo2B and the parallel line L1 is β3.

[0086] The contact surface 411boB has intersecting portions bo1eB and bo2eB intersecting with a pair of side surfaces 411bBf in a top view. The intersecting portion bo1eB is a portion where the first inclined surface bo1B intersects with the side surface 411bBf on the reverse rotation direction side C1, and the intersecting portion bo2eB is a portion where the second inclined surface bo2B intersects with the side surface 411bBf on the rotation direction side C2. The intersecting portion bo2eB is located closer to the rotor side R12 in the radial direction R than the intersecting portion bo1eB. As a result, a virtual inclined surface passing through the intersecting portions bo1eB and bo2eB has an inclination that rises to the right in FIG. 11. In addition, the intersecting portion 411bcB of the contact surface 411boB is located on one side of the radial direction R (i.e., the opposite side R11 in the radial direction R) with respect to the virtual inclined surface passing through the intersecting portions bo1eB and bo2eB.

[0087] In other words, an intersection portion 411bcB where the two inclined surfaces bo1B and bo2B intersect on the contact surface 411boB is recessed toward one side in the radial direction R (that is, recessed toward the opposite side R11 in the radial direction R).

[0088] In addition, in the circumferential direction C of the stator core 41B according to this embodiment, the intersection portion 411bcB is closer to the side surface 411bBf on the reverse rotation direction side C1 than to the side surface 411bBf on the rotation direction side C2. Therefore, the length of the second inclined surface bo2B is longer than the length of the first inclined surface bo1B, and the intersection angle α3 and the intersection angle β3 are different. More specifically, the intersection angle β3 is larger than the intersection angle α3. As a result, the inclination of the first inclined surface bo1B is gentler than the inclination of the second inclined surface bo2B.

[0089] Each of the teeth 412aB shown in FIG. 9 extends from one side to the other side in the radial direction R. More specifically, each of the teeth 412aB has a base end portion 412bB 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 412bB of the multiple teeth 412aB are connected in the circumferential direction C. In other words, the base ends 412bB are formed in an annular shape when viewed from the axial direction A. Furthermore, each of the teeth 412aB has a pair of side surfaces 412aBf facing each other in the circumferential direction C in a top view (see FIG. 11).

[0090] The base end 412bB 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.

[0091] Each of the multiple teeth 412aB has an inner end surface 412aiB on one side in the radial direction R. The inner end surface 412aiB faces, in the radial direction R, a contact surface 411boB of the inner core 411B which is the first core.

[0092] The inner end surface 412aiB shown in FIG. 11 has a third inclined surface ai3B and a fourth inclined surface ai4B when viewed from above.

[0093] Moreover, when viewed from above, the intersection angle between the third inclined surface ai3B and the parallel line L1 is γ3.

[0094] Furthermore, in the top view, the intersection angle between the fourth inclined surface ai4B and the parallel line L1 is δ3.

[0095] The inner end surface 412aiB has intersections ai3eB and ai4eB intersecting with a pair of side surfaces 412aBf in a top view. The intersection ai3eB is a portion where the third inclined surface ai3B intersects with the side surface 412aBf on the reverse rotation direction side C1, and the intersection ai4eB is a portion where the fourth inclined surface ai4B intersects with the side surface 412aBf on the rotation direction side C2. The intersection ai3eB is located on the opposite side R11 in the radial direction R from the intersection ai4eB. As a result, a virtual inclined surface passing through the intersections ai3eB and ai4eB has an upward inclination to the right in FIG. 11. In addition, the intersection 412acB of the inner end surface 412aiB is located on one side in the radial direction R (i.e., the opposite side R11 in the radial direction R) with respect to the virtual inclined surface passing through the intersections ai3eB and ai4eB.

[0096] In other words, an intersection portion 412acB where the two inclined surfaces ai3B, ai4B of the inner end surface 412aiB intersect protrudes to one side in the radial direction R (that is, protrudes to the opposite side R11 in the radial direction R).

[0097] In addition, in the circumferential direction C of the stator core 41B according to this embodiment, the intersection portion 412acB is closer to the side surface 412aBf on the reverse rotation direction side C1 than to the side surface 412aBf on the rotation direction side C2. Therefore, the length of the fourth inclined surface ai4B is longer than the length of the third inclined surface ai3B, and the intersection angle γ3 is different from the intersection angle δ3. More specifically, the intersection angle γ3 is larger than the intersection angle δ3. As a result, the inclination of the third inclined surface ai3B is gentler than the inclination of the fourth inclined surface ai4B.

[0098] Next, assembly of the stator core 41B will be described with reference to Figures 9, 10 and 11. First, as shown in Figure 9, an operator places the inner core 411B on one side in the axial direction A relative to the outer core 412B.

[0099] Next, the worker moves the inner core 411B to the other side in the axial direction A relative to the outer core 412B, and positions the inner core 411B on the opposite side R11 in the radial direction R of the outer core 412B so that at least the first inclined surface bo1B and the third inclined surface ai3B are not opposed to each other in the radial direction R.

[0100] Next, as indicated by an arrow F3 in FIG. 11, the worker moves the outer core 412B in the circumferential direction C (more specifically, toward the rotational direction C2) relative to the inner core 411B.

[0101] Then, as shown in FIG. 10, the second inclined surface bo2B comes into contact with the fourth inclined surface ai4B, and the first inclined surface bo1B comes into contact with the third inclined surface ai3B, so that the outer core 412B can be attached to the inner core 411B, and the stator core 41B can be assembled.

[0102] As described above, the stator core 41B according to this embodiment includes a ring-shaped inner core 411B and an outer core 412B having a plurality of teeth 412aB extending from one side to the other side in the radial direction R. Moreover, in the stator core 41B, each of the plurality of teeth 412aB has a base end portion 412bB extending in the circumferential direction C at the tip end on the other side, and the base ends 412bB of the plurality of teeth 412aB are connected in the circumferential direction C, and a plurality of protrusions 411bB are formed on an outer circumferential surface (peripheral surface) 411ao of the inner core (first core) 411B facing an inner end surface 412aiB on one side of each of the plurality of teeth 412aB. Furthermore, in the stator core 41B, each of the multiple protrusions 411bB has a contact surface 411boB that contacts with one inner end surface 412aiB of each of the multiple teeth 412aB, and the contact surface 411boB has two intersecting inclined surfaces bo1B and bo2B. The two inclined surfaces bo1B and bo2B intersect so as to be recessed toward one side of the radial direction R. As described above, according to the present embodiment, the stator core 41B can be assembled without a special process, and thus the manufacturing equipment can be simplified. In other words, according to the stator core 41B according to the present embodiment, the time (so-called tact time) for manufacturing one stator core 41B can be shortened. Furthermore, according to the stator core 41B according to the present embodiment, it is possible to prevent one core of the outer core 412B and the inner core 411B from coming off relative to the other core. In other words, according to the stator core 41B according to the present embodiment, it is possible to prevent one core of the inner core 411B and the outer core 412B from coming off relative to the other core.

[0103] In a stator core 41B according to this embodiment, an inner end surface (tip surface) 412aiB of an outer core 412B is aligned along two inclined surfaces bo1B, bo2B of an inner core 411B.

[0104] [First Modification of the Second Embodiment] Next, a stator core 41C according to a first modified example of the second embodiment will be described with reference to Figs. 12 and 13. Fig. 12 is an enlarged plan view showing a part of the stator core 41C according to the first modified example of the second embodiment. Fig. 13 is a partially enlarged view showing the assembly of the stator core 41C shown in Fig. 12. Differences between the configuration of the stator core 41C according to the first modified example of the second embodiment and the configuration of the stator core 41B according to the second embodiment will be described below, and the same configuration will be denoted by the same reference numerals and description thereof will be omitted.

[0105] The protrusion 411bC shown in FIG. 13 has a pair of side surfaces 411bCf opposing each other in the circumferential direction C in a top view (see FIG. 13).

[0106] The contact surface 411boC shown in FIG. 13 has a first inclined surface bo1C and a second inclined surface bo2C when viewed from above.

[0107] In addition, when viewed from above, the intersection angle between the first inclined surface bo1C and the parallel line L1 is α4.

[0108] Furthermore, in the top view, the intersection angle between the second inclined surface bo2C and the parallel line L1 is β4.

[0109] The contact surface 411boC has intersecting portions bo1eC and bo2eC intersecting with a pair of side surfaces 411bCf in a top view. The intersecting portion bo1eC is a portion where the first inclined surface bo1C intersects with the side surface 411bCf on the reverse rotation direction side C1, and the intersecting portion bo2eC is a portion where the second inclined surface bo2C intersects with the side surface 411bCf on the rotation direction side C2. The intersecting portion bo1eC is located closer to the rotor side R12 in the radial direction R than the intersecting portion bo2eC. As a result, a virtual inclined surface passing through the intersecting portions bo1eC and bo2eC is inclined downward to the right in FIG. 13. In addition, the intersecting portion 411bcC of the contact surface 411boC is located on the other side of the radial direction R (i.e., the rotor side R12 in the radial direction R) with respect to the virtual inclined surface passing through the intersecting portions bo1eC and bo2eC.

[0110] In other words, an intersection portion 411bcC where the two inclined surfaces bo1C, bo2C of the contact surface 411boC intersect protrudes to the other side in the radial direction R (that is, protrudes to the rotor side R12 in the radial direction R).

[0111] In addition, in the circumferential direction C of the stator core 41C according to this modification, the intersection portion 411bcC is closer to the side surface 411bCf on the rotation direction side C2 than to the side surface 411bCf on the reverse rotation direction side C1. Therefore, the length of the first inclined surface bo1C is longer than the length of the second inclined surface bo2C, and the intersection angle α4 and the intersection angle β4 are different. More specifically, the intersection angle α4 is larger than the intersection angle β4. As a result, the inclination of the first inclined surface bo1C is gentler than the inclination of the second inclined surface bo2C.

[0112] In top view, each of the teeth 412aC has a pair of side surfaces 412aCf opposing each other in the circumferential direction C. Each of the teeth 412aC also has an inner end surface 412aiC on one side in the radial direction R. The inner end surface 412aiC faces in the radial direction R a contact surface 411boC of an inner core 411C serving as a first core.

[0113] The inner end surface 412aiC shown in FIG. 13 has a third inclined surface ai3C and a fourth inclined surface ai4C in top view.

[0114] Moreover, in the top view, the intersection angle between the third inclined surface ai3C and the parallel line L1 is γ4.

[0115] Furthermore, in the top view, the intersection angle between the fourth inclined surface ai4C and the parallel line L1 is δ4.

[0116] The inner end surface 412aiC has intersections ai3eC and ai4eC intersecting with a pair of side surfaces 412aCf in a top view. The intersection ai3eC is a portion where the third inclined surface ai3C intersects with the side surface 412aCf on the reverse rotation direction side C1, and the intersection ai4eC is a portion where the fourth inclined surface ai4C intersects with the side surface 412aCf on the rotation direction side C2. The intersection ai3eC is located closer to the rotor side R12 in the radial direction R than the intersection ai4eC. As a result, a virtual inclined surface passing through the intersections ai3eC and ai4eC is inclined downward to the right in FIG. 13. Furthermore, the intersection 412acC of the inner end surface 412aiC is located on the other side of the radial direction R (i.e., the rotor side R12 in the radial direction R) with respect to the virtual inclined surface passing through the intersections ai3eC and ai4eC.

[0117] In other words, an intersection portion 412acC where the two inclined surfaces ai3C, ai4C of the inner end surface 412aiC intersect is recessed to one side in the radial direction R (that is, recessed toward the rotor side R12 in the radial direction R).

[0118] In addition, in the circumferential direction C of the stator core 41C according to this modification, the intersection portion 412acC is closer to the side surface 412aCf on the rotation direction side C2 than to the side surface 412aCf on the reverse rotation direction side C1. Therefore, the length of the third inclined surface ai3C is longer than the length of the fourth inclined surface ai4C, and the intersection angles γ4 and δ4 are different. More specifically, the intersection angle δ4 is larger than the intersection angle γ4. As a result, the inclination of the third inclined surface ai3C is gentler than the inclination of the fourth inclined surface ai4C.

[0119] Next, the assembly of the stator core 41C will be described. First, after winding the coil 42 around the teeth 412aC, an operator places the inner core 411C on one side in the axial direction A relative to the outer core 412C.

[0120] Next, the worker moves the inner core 411C to the other side in the axial direction A relative to the outer core 412C, and positions the inner core 411C on the opposite side R11 in the radial direction R of the outer core 412C so that at least the second inclined surface bo2C and the fourth inclined surface ai4C are not opposed to each other in the radial direction R.

[0121] Next, as indicated by an arrow F4 in FIG. 13, the worker moves the outer core 412C in the circumferential direction C (more specifically, toward the reverse rotational direction C1) relative to the inner core 411C.

[0122] Then, as shown in FIG. 12, the second inclined surface bo2C comes into contact with the fourth inclined surface ai4C, and the first inclined surface bo1C comes into contact with the third inclined surface ai3C, so that the outer core 412C can be attached to the inner core 411C, and the stator core 41C can be assembled.

[0123] As described above, the stator core 41C according to this modification includes the ring-shaped inner core 411C and the outer core 412C having the plurality of teeth 412aC extending from one side to the other side in the radial direction R. Moreover, in the stator core 41C, each of the plurality of teeth 412aC has a base end portion 412bB extending in the circumferential direction C at the tip end on the other side, and the base end portions 412bB of the plurality of teeth 412aC are connected in the circumferential direction C. A plurality of protrusions 411bC are formed on the outer circumferential surface (circumferential surface) 411ao of the inner core (first core) 411C. Furthermore, in the stator core 41C, each of the plurality of protrusions 411bC has a contact surface 411boC that contacts with the inner end surface 412aiC on one side of each of the plurality of teeth 412aC, and the contact surface 411boC includes two intersecting inclined surfaces bo1C and bo2C. The two inclined surfaces bo1C and bo2C intersect so as to protrude toward the other side in the radial direction R. As described above, according to this modification, the stator core 41C can be assembled without a special process, and the manufacturing equipment can be simplified. In other words, according to the stator core 41C of this modification, the time required to manufacture one stator core 41C (so-called tact time) can be shortened. Furthermore, according to the stator core 41C of this modification, it is possible to prevent one of the outer core 412C and the inner core 411C from coming off relative to the other core. In other words, according to the stator core 41C of the modification, it is possible to prevent one of the inner core 411C and the outer core 412C from coming off relative to the other core.

[0124] The above has been described based on the embodiments and modifications of the stator cores 41, 41A, 41B, 41C, 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 will be clear to those skilled in the art from the description of the claims. [Explanation of symbols]

[0125] 1, 1B, motor, 3, 3B rotor, 41, 41A, 41B, 41C stator core, 411, 411A outer core (first core), 411B, 411C inner core (first core), 411b protrusion, 412, 412A inner core (second core), 412B, 412C outer core (second core), 412a teeth, 412aiB, 412aiC inner end surface (tip surface), 412ao, 412aoA outer end surface (tip surface), 412b base end portion, 411bi contact surface, 411bc, 411bcA, 412acB, 412acC intersection portion (intersecting portion), bi1, bi1A, bo1B, bo1C first inclined surface (inclined surface), bi2, bi2A, bo2B, bo2C 2nd inclined surface (inclined surface), C circumferential direction, R radial direction

Claims

1. A ring-shaped first core; 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 a circumferential direction at a tip end on the other side, The base ends of the teeth are connected in a circumferential direction, 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 comes into contact with a tip end surface on the one side of each of the plurality of teeth; The contact surface comprises two intersecting inclined surfaces; The two inclined surfaces intersect so as to be recessed in one radial direction, or intersect so as to be protruded in the other radial direction. Stator core.

2. The tip surface of the second core is aligned along the two inclined surfaces. The stator core according to claim 1 .

3. The stator core according to claim 1 or 2, A rotor; Equipped with Motor.

Images