JP2020178430A - Stator and motor - Google Patents

Abstract

To propose an outer rotor type stator that can reduce leakage flux and improve the efficiency.SOLUTION: A stator includes a stator core having a plurality of split cores (40) arranged in an annular shape. The split core (40) includes a yoke portion (41) on the inner side in the radial direction and a teeth portion (31) protruding outward in the radial direction from the yoke portion (41). A fitting portion (42) is provided as to be biased inward in a radial direction from the teeth portion (31) side on the joint surface (43) side where the yoke portions (41) of the split cores (40) adjacent to each other are connected to each other. Each of a convex portion (41a) and a concave portion (41b) of the fitting portion (42) includes two linear portions (L11, L12, L21, L22) parallel to each other extending from one end on the joint surface (43) side so as to form a predetermined angle with respect to the joint surface (43), and curved portions (C11, C21) that connect the other ends of the two linear portions (L11, L12, L21, L22) and bulge to the side opposite to the joint surface (43) side.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to stators and motors.

Conventionally, as a stator, there is an inner rotor type stator having a stator core formed by connecting a plurality of divided cores at a joint surface (see, for example, Japanese Patent Application Laid-Open No. 2012-17026 (Patent Document 1)). The plurality of divided cores of the stator each have a yoke portion extending in the circumferential direction and two tooth portions extending radially inward from the inner peripheral side end portion of the yoke portion.

In the above-mentioned stator, a plurality of electromagnetic steel plates having laminated cores are bonded to each other by caulking provided on the outer peripheral side.

Japanese Unexamined Patent Publication No. 2012-17026

However, in the above-mentioned conventional inner rotor type stator, adjacent split cores are connected to each other by fitting the convex and concave abutting portions provided on the joint surface of the yoke portion of the split core. Since the abutting portion is a portion having a high magnetic flux density, the leakage flux becomes large.

On the other hand, in the outer rotor type stator, in the split core constituting the stator core, there is a region having a high magnetic flux density on the joint surface of the yoke portion of the split core, and a fitting portion for connecting the split core is provided in such a region. If it is provided, there is a problem that the leakage flux becomes large.

The present disclosure proposes an outer rotor type stator capable of reducing leakage flux and improving efficiency, and a motor including the stator.

The stator of the present disclosure is
It has a stator core with a plurality of split cores arranged in an annular shape.
The split core has a yoke portion on the inner side in the radial direction of the stator core, and a tooth protruding from the yoke portion on the radial side of the stator core.
On the joint surface side where the yoke portions of the split cores adjacent to each other are connected to each other, the fitting portion is provided so as to be biased inward in the radial direction from the teeth portion side.
The fitting portion has a convex portion of the yoke portion provided on one side of the stator core in the circumferential direction and a concave portion of the yoke portion provided on the other side of the circumferential direction.
Each of the convex portion and the concave portion is between two straight portions parallel to each other extending from one end on the joint surface side so as to form a predetermined angle with respect to the joint surface and the other end of the two straight portions. It is characterized by having a curved portion that bulges on the side opposite to the joint surface side.

According to the present disclosure, the magnetic flux of the fitting portion is provided by providing the fitting portion on the joint surface side where the yoke portions of the split cores adjacent to each other are connected to each other in a radial direction of the stator core rather than the teeth portion side. Since the density is lower than the magnetic flux density on the radially outer side of the fitting portion, the leakage flux due to the fitting portion can be reduced and the efficiency can be improved. Further, the divided cores adjacent to each other can be easily separated by the convex portion and the concave portion having two straight portions parallel to each other extending from one end on the joint surface side and a curved portion connecting between the other ends of the two straight portions. Can be combined with.

Further, in the stator according to one aspect of the present disclosure,
The two straight portions form an angle of 90 deg with respect to the joint surface.

Further, in the stator according to one aspect of the present disclosure,
Of the two straight portions of the convex portion, the linear portion on the outer side in the radial direction has an angle θ1 formed with respect to the joint surface of 81 deg or more and 89 deg or less.
The radial outer straight portion of the two linear portions of the concave portion has an angle θ2 formed with respect to the joint surface (180 deg−θ1).

According to the present disclosure, the fitting portion provided in the yoke portion of the split core extends diagonally outward with respect to the direction orthogonal to the joint surface, and therefore extends in the direction orthogonal to the joint surface with respect to the split core. Since the fitting portion is less likely to be disengaged with respect to the working force, the coupling force between the divided cores can be maintained.

Further, in the stator according to one aspect of the present disclosure,
On the joint surface of the yoke portion of the split core, the end of the fitting portion is located on the inner side in the radial direction from the center between the outer end in the radial direction and the inner end in the radial direction.

According to the present disclosure, on the joint surface of the yoke portion of the split core, the end of the fitting portion is located radially inside the stator core with respect to the center of the radial dimension of the yoke portion, so that the joint surface of the yoke portion is located. Leakage flux due to the mating part can be reliably reduced.

Further, in the stator according to one aspect of the present disclosure,
A coil wound in a concentrated winding is provided around the teeth portion of the stator core.

According to the present disclosure, when the coil is wound around the teeth portion of the stator core by concentrated winding, the magnetic flux density on the outer side in the radial direction is high and the magnetic flux density on the inner side in the radial direction is low at the joint surface of the yoke portion of the split core. , The fitting portion can be provided in a region where the magnetic flux density is lower in the radial direction than the teeth portion side of the yoke portion.

Further, in the stator according to one aspect of the present disclosure,
The fitting portion is crimped on at least one of the upper end surface and the lower end surface of the stator core.

According to the present disclosure, by providing the fitting portion with caulking on at least one of the upper end surface and the lower end surface of the stator core, the fitting portion is plastically deformed, so that the fastening force between the divided cores can be improved. Therefore, even if the fitting portion has a small shape, the fastening force between the divided cores can be secured, the length of the contact portion in the fitting portion can be shortened, and the leakage flux can be reduced. Further, since the strain due to caulking stays at at least one of the upper end side and the lower end side of the stator core, the influence of iron loss due to the caulking strain is small.

Further, the motor of the present disclosure is
With any one of the above stators
It is characterized by including a rotor arranged so as to face the radial outer side of the stator.

According to the present disclosure, the leakage flux of the stator can be reduced and the efficiency can be improved.

It is sectional drawing of the motor provided with the stator of 1st Embodiment of this disclosure. It is sectional drawing of the motor seen from the line II-II of FIG. It is a top view of the stator core. It is a top view of the split core which constitutes the stator core. It is a top view which shows the state which connected the said division cores. It is an enlarged view of the main part including the fitting part of the split core of 1st example. It is an enlarged view of the main part including the fitting part of the split core of the 2nd example. It is an enlarged view of the main part including the fitting part of the split core of 3rd example. It is an enlarged view of the main part including the fitting part of the split core of 4th example. It is an enlarged view of the main part including the fitting part of the split core of 5th example. It is an enlarged view of the main part including the fitting part of the split core of 6th example. It is a figure which shows the magnetic flux distribution of the said stator core. It is a top view of the split core which constitutes the stator core of the stator of the 2nd Embodiment of this disclosure. It is a schematic diagram of the 1st assembly explaining the manufacturing method of the stator of this disclosure. It is a schematic diagram of the 2nd assembly explaining the manufacturing method of a stator. It is a schematic diagram of the 3rd assembly explaining the manufacturing method of a stator. It is a schematic diagram of a plurality of third assemblies explaining the manufacturing method of a stator. It is a schematic diagram of the stator explaining the manufacturing method of the stator.

Hereinafter, embodiments will be described. In the drawings, the same reference number represents the same part or the corresponding part. In addition, the dimensions on the drawing such as length, width, thickness, and depth are appropriately changed from the actual scale for the purpose of clarifying and simplifying the drawing, and do not represent the actual relative dimensions.

[First Embodiment]
FIG. 1 is a cross-sectional view of the motor 100 provided with the stator 1 of the first embodiment of the present disclosure, and shows a cross-sectional view of the motor 100 as seen from the line II of FIG. Further, FIG. 2 is a cross-sectional view of the motor 100 as viewed from the line II-II of FIG.

As shown in FIG. 1, the motor 100 is a so-called outer rotor type motor 100, and includes an annular stator 1 and a rotor 2 arranged so as to face the radial outer side of the stator 1. The motor 100 rotationally drives a member such as a fan (not shown) via a shaft 3.

As shown in FIGS. 1 and 2, the rotor 2 includes a mold resin 20, a plurality of back yokes 21, and a plurality of magnets 22.

The mold resin 20 is formed in a cup shape and covers the stator core 10 of the stator 1. The mold resin 20 is fixed to the shaft 3 via the connecting member 23. In this embodiment, BMC (Bulk Molding Compound) is used for the molding resin 20.

The back yoke 21 and the magnet 22 are integrally molded by the molding resin 20. In this first embodiment, eight back yokes 21 are arranged in a ring shape. Eight magnets 22 are arranged in an annular shape inside the back yoke 21 in the radial direction. The magnets 22, 22 adjacent to each other in the circumferential direction have different magnetisms.

The stator 1 includes a stator core 10, an insulator 11, and a coil 12.

The stator core 10 is composed of a plurality of laminated electromagnetic steel plates. The stator core 10 has an annular stator yoke 30 and a plurality of tooth portions 31 projecting radially outward from the outer peripheral surface of the stator yoke 30. In this first embodiment, twelve tooth portions 31 are arranged at intervals in the circumferential direction.

The insulator 11 is attached to each tooth portion 31 of the stator core 10. The insulator 11 is made of an insulating material such as resin.

The coil 12 is wound around the teeth portion 31 of the stator core 10 in a concentrated manner via an insulator 11. An electric current is passed through the coil 12 to generate an electromagnetic force in the stator core 10, and the electromagnetic force causes the rotor 2 to rotate together with the shaft 3.

The mold resin portion 13 integrally molds the stator core 10, the insulator 11, and the coil 12. The mold resin portion 13 is made of, for example, a BMC (Bulk Molding Compound).

The mold resin portion 13 supports the shaft 3 via a bearing 14. The mold resin portion 13 is provided with a mounting base 15 for mounting the motor 100 to another member (not shown). A cover 16 is attached to the mounting base 15. The cover 16 covers the rotor 2 to prevent dust, water, and the like from entering. The cover 16 is formed by integrally molding the bearing housing 17 with a molding resin. The cover 16 supports the shaft 3 via a bearing 18.

FIG. 3 is a plan view of the stator core 10. As shown in FIG. 3, the stator core 10 has a plurality of divided cores 40 arranged in an annular shape. The split core 40 has a yoke portion 41 on the inner side in the radial direction and a teeth portion 31 protruding radially outward from the yoke portion 41.

Twelve split cores 40 are arranged in a ring shape, and the yoke portions 41 of the adjacent split cores 40 are connected to each other to form the stator core 10.

FIG. 4 is a plan view of the split core 40 constituting the stator core 10. As shown in FIG. 4, the yoke portion 41 of the split core 40 is located on one of the joint surfaces 43 in the circumferential direction of the stator core 40. 41a of the convex portion 41a provided along the axial direction of the stator core 10 from the upper end surface to the lower end surface of the above, and the stator core 10 from the upper end surface to the lower end surface of the split core 40 on the other joint surface 43 side in the circumferential direction. It has a recess 41b provided along the axial direction.

In a plan view, the convex portion 41a of the yoke portion 41 connects two linear portions L11 and L12 parallel to each other extending from one end on the joint surface 43 side and the other ends of the two straight portions L11 and L12. It has an arc portion C11 that bulges on the side opposite to the joint surface 43 side. The arc portion C11 is an example of a curved portion.

The straight portions L11 and L12 each form an angle of 90 deg with respect to the joint surface 43 on one side in the circumferential direction of the yoke portion 41.

Further, the concave portion 41b of the yoke portion 41 connects the two parallel straight portions L21 and L22 extending from one end on the joint surface 43 side and the other ends of the two straight portions L21 and L22, and the joint surface 43. It has an arc portion C21 that bulges on the side opposite to the side. The arc portion C21 is an example of a curved portion.

The straight portions L21 and L22 each form an angle of 90 deg with respect to the joint surface 43 on the other side in the circumferential direction of the yoke portion 41.

Further, a caulking 47 is provided on the yoke portion 41 side of the split core 40, and a caulking 48 is provided on the radial outer side of the teeth portion 31. By the caulking 47, 48, a plurality of electromagnetic steel plates constituting the split core 40 are integrally fixed.

FIG. 5 is a plan view showing a state in which two divided cores 40 are connected, and in FIG. 5, L1 is a center line in the radial direction of each divided core 40. As shown in FIG. 5, in the yoke portions 41 and 41 of the adjacent split cores 40, the convex portion 41a of the yoke portion 41 of one split core 40 and the concave portion 41b of the yoke portion 41 of the other split core 40 are fitted. Adjacent yoke portions 41 are joined to each other. The fitting portion 42 is composed of the convex portion 41a and the concave portion 41b of the yoke portion 41.

Here, the fitting portion 42 includes a convex portion 41a of the yoke portion 41 of one split core 40 and a peripheral portion of the concave portion 41b forming the recess 41b in the yoke portion 41 of the other split core 40.

At the joint surface 43 of the yoke portion 41 of the split core 40, from the center P1 (the intersection of the virtual circle VC shown in FIG. 5 and the joint surface 43) between the radial outer end and the radial inner end of the stator core 10. The end of the fitting portion 42 is located inside in the radial direction. The virtual circle VC is a circle centered on the center O1 of the stator core 10 and passes through the center P1 of the joint surface 43 of the yoke portion 41 of each divided core 40. The plane along the joint surface 43 of the yoke portion 41 passes through the center O1 of the stator core 10.

On the other hand, in the teeth portions 31 of all the divided cores 40, the outer peripheral portions of the adjacent teeth portions 31, 31 are separated from each other.

In this way, the adjacent yoke portions 41 are connected to each other, and the 12 yoke portions 41 connected together form the stator yoke 30.

Before connecting the adjacent yoke portions 41 to each other, each split core 40 covers the teeth portion 31 with an insulator 11 (shown in FIGS. 1 and 2) and coiles the teeth portion 31 covered with the insulator 11. Wind 12 (shown in FIG. 1).

In the stator 1 of the first embodiment, the fitting portion 42 provided in the yoke portion 41 of the split core 40 extends in a direction orthogonal to the joint surface 43.

Here, as shown in the first to sixth examples of FIGS. 6 to 11, any of the caulking 44A to 44G is provided on the fitting portion 42 on the upper end surface and the lower end surface of the stator core 10. As a result, the fitting portion 42 is plastically deformed, so that the fastening force between the split cores 40 can be improved. Further, even if the fitting portion 42 has a small shape, the fastening force between the split cores 40 can be secured by the caulking 44A to 44G, so that the length of the contact portion in the fitting portion 42 is shortened to reduce the leakage flux. can do. Further, since the strain caused by the caulking 44A to 44G stays on the upper end side and the lower end side of the stator core 10, the influence of the iron loss due to the strain of the caulking 44A to 44G is small.

FIG. 6 shows an enlarged view of a main part including the fitting portion 42 of the split core 40 of the first example, and as shown in FIG. 6, a length is formed on the convex portion 41a of the fitting portion 42 of the yoke portion 41. A thick linear caulking 44A is provided so that the direction is along the circumferential direction of the stator core 10.

FIG. 7 shows an enlarged view of a main part including the fitting portion 42 of the split core 40 of the second example, and as shown in FIG. 7, a circle is formed on the convex portion 41a of the fitting portion 42 of the yoke portion 41. A caulking 44B having a shape is provided.

FIG. 8 shows an enlarged view of a main part including the fitting portion 42 of the split core 40 of the third example, and as shown in FIG. 8, with the tip portion of the convex portion 41a of one of the adjacent yoke portions 41. A thick linear caulking 44C is provided so as to straddle the other adjacent yoke portion 41 so that the longitudinal direction is along the circumferential direction of the stator core 10.

FIG. 9 shows an enlarged view of a main part including the fitting portion 42 of the split core 40 of the fourth example, and as shown in FIG. 9, the convex portion 41a of one of the adjacent yoke portions 41 and the convex portion 41a thereof. A thick linear caulking 44D is provided so as to straddle both sides of the portion 41a in the radial direction and the other adjacent yoke portion 41 so that the longitudinal direction is along the radial direction.

FIG. 10 shows an enlarged view of a main part including the fitting part of the split core 40 of the fifth example, and as shown in FIG. 10, the convex portion 41a of one of the adjacent yoke portions 41 has a longitudinal direction. A thick linear caulking 44E is provided along the radial direction.

FIG. 11 shows an enlarged view of a main part including the fitting portion 42 of the split core 40 of the sixth example, and as shown in FIG. 11, on both sides of the concave portion 41b of one of the adjacent yoke portions 41 in the radial direction. Thick linear caulking 44F, 44G is provided so that the longitudinal direction is along the circumferential direction of the stator core 10.

FIG. 12 shows the magnetic flux distribution of the stator core 10 obtained by simulation. Note that, in FIG. 12, the rotor 2 has a configuration for simulation, unlike the configuration shown in FIG.

As shown in FIG. 12, the magnetic flux density in the fitting portion 42 of the split core 40 is lower than the magnetic flux density in the region radially outer of the fitting portion 42 in the joint surface 43 of the split core 40. Therefore, the leakage flux due to the fitting portion 42 can be reduced.

According to the stator 1 having the above configuration, the fitting portion 42 is biased to the joint surface 43 side where the yoke portions 41 of the split cores 40 adjacent to each other are connected to each other, and the fitting portion 42 is biased in the radial direction of the stator core 10 from the teeth portion 31 side. By providing the fitting portion 42, the magnetic flux density of the fitting portion 42 is lower than the magnetic flux density on the radially outer side of the fitting portion 42, so that the leakage flux due to the fitting portion 42 can be reduced and the efficiency can be improved.

Further, on the joint surface 43 of the yoke portion 41 of the split core 40, the end of the fitting portion 42 is located radially inside the center P1 between the radially outer end and the radial inner end of the stator core 10. As a result, the leakage flux due to the fitting portion 42 on the joint surface 43 of the yoke portion 41 can be reliably reduced.

Further, the convex portion 41a of the fitting portion 42 is an arc portion that connects two straight portions L11 and L12 that are parallel to each other extending from one end on the joint surface 43 side and the other ends of the two straight portions L11 and L12. The recess 41b of the fitting portion 42 has a shape having C11, and the recess 41b of the fitting portion 42 is formed between two parallel straight portions L21 and L22 extending from one end on the joint surface 43 side and the other ends of the two straight portions L21 and L22. By forming the shape having the arcuate portion C21 to be connected, the convex portion 41a of one of the split cores 40 adjacent to each other is inserted into the concave portion 41b of the other split core 40 from the circumferential direction of the stator core 10. The split cores 40 can be easily connected to each other.

Further, when the coil 12 is wound around the teeth portion 31 of the stator core 10 by concentrated winding, the magnetic flux density on the outer side in the radial direction is high and the magnetic flux density on the inner side in the radial direction is low on the joint surface 43 of the yoke portion 41 of the split core 40. Therefore, the fitting portion 42 can be provided in a region where the magnetic flux density is lower in the radial direction than the teeth portion 31 side of the yoke portion 41.

Further, according to the motor 100 having the above configuration, the leakage flux of the stator 1 can be reduced and the efficiency can be improved.

In the first embodiment, in a plan view, a virtual circle VC in which the convex portion 41a and the concave portion 41b of the fitting portion 42 are centered on the center O1 of the stator core 10 and pass through the center P1 of the joint surface 43 of the yoke portion 41. Although it is provided inside the stator core 10 in the radial direction, the convex portion and the concave portion of the fitting portion have a portion radially outer and a portion radially inside the virtual circle VC, and the portion inside the radial direction. The fitting portion may be provided so that the area is larger than the area of the portion outside in the radial direction.

Further, in the first embodiment, the fitting portion 42 is provided with any of caulking 44A to 44G on the upper end surface and the lower end surface of the stator core 10, but the fitting portion 42 is fitted on either the upper end surface or the lower end surface of the stator core. Caulking may be provided at the joint. If the coupling force of the fitting portion is sufficient, it is not necessary to provide the fitting portion with caulking, but the rigidity of the stator can be increased by providing the fitting portion with caulking.

Next, a method of manufacturing the stator 1 of the first embodiment will be described.

First, the insulator 50 is attached to the split core 40 in which a plurality of laminated electromagnetic steel plates are integrally fixed so as to sandwich the insulator 50 from above and below, and the split core 40 and the insulator 50 form a first assembly A (shown in FIG. 14). To do.

Next, the first assembly A is mounted on a winding machine (not shown).

Next, the coil 12 is wound around the split core 40 mounted on the winding machine to form the second assembly B (shown in FIG. 15).

Next, the convex portion 41a and the concave portion 41b of the yoke portion 41 of the split core 40 of the two second assemblies B are fitted together, and the yoke portions 41 are joined to each other. As a result, one third assembly C (shown in FIG. 16) is formed by the two second assemblies B.

Next, the six third assemblies C (shown in FIG. 17) are press-fitted in the thrust direction so as to be combined in an annular shape. As a result, the convex portion 41a of the yoke portion 41 of one split core 40 and the concave portion 41b of the yoke portion 41 of the other split core 40 are fitted between the third assembly C to join the yoke portions 41 to each other. Then, the stator 1 (shown in FIG. 18) composed of the six third assemblies C is completed.

[Second Embodiment]
FIG. 13 is a plan view of the split core 140 constituting the stator core of the stator of the second embodiment of the present disclosure. The split core 140 of the stator of the second embodiment has the same configuration as the split core 40 of the stator 1 of the first embodiment except for the fitting portion 142 composed of the convex portion 141a and the concave portion 141b of the yoke portion 141. Therefore, Fig. 1 and Fig. 2 are used.

As shown in FIG. 13, the yoke portion 141 of the split core 140 has a convex portion 141a provided on one side in the circumferential direction of the stator core 10 and a concave portion 141b provided on the other side in the circumferential direction.

In a plan view, the convex portion 141a of the yoke portion 141 connects two linear portions L31 and L32 parallel to each other extending from one end on the joint surface 143 side and the other ends of the two straight portions L31 and L32. It has an arc portion C31 that bulges on the side opposite to the joint surface 143 side. The arc portion C31 is an example of a curved portion.

The straight portion L31 forms an angle of 85 deg with respect to the joint surface 143 on one side of the yoke portion 141 in the circumferential direction. In other words, the radial outer straight portion L31 of the two straight portions L31 and L32 of the convex portion 141a has an angle θ1 formed with respect to the joint surface 143 of 85 deg. Further, the straight portion L32 forms an angle of 95 deg with respect to the joint surface 143 on one side in the circumferential direction of the yoke portion 141. In other words, the radial inner straight portion L32 of the two straight portions L31 and L32 of the convex portion 141a has an angle θ2 formed with respect to the joint surface 143 of 95 deg.

Further, the recess 141b of the yoke portion 141 connects the two parallel straight portions L41 and L42 extending from one end on the joint surface 143 side and the other ends of the two straight portions L41 and L42, and connects the other ends of the two straight portions L41 and L42, and the joint surface 143 It has an arc portion C41 that bulges on the side opposite to the side. The arc portion C41 is an example of a curved portion.

The straight portion L41 forms an angle of 95 deg with respect to the joint surface 143 on the other side of the yoke portion 141 in the circumferential direction. In other words, the radial outer straight portion L41 of the two straight portions L41 and L42 of the recess 141b forms an angle of 95 deg with respect to the joint surface 143. Further, the straight portion L42 forms an angle of 85 deg with respect to the joint surface 143 on one side in the circumferential direction of the yoke portion 141. In other words, the radial inner straight portion L42 of the two straight portions L41 and L42 of the recess 141b forms an angle of 85 deg with respect to the joint surface 143.

A caulking 147 is provided on the yoke portion 141 side of the split core 140, and a caulking 148 is provided on the radial outer side of the tooth portion 131. A plurality of electromagnetic steel plates constituting the divided core 40 are integrally fixed by the caulking 147,148.

The stator of the second embodiment has the same effect as the stator 1 of the first embodiment.

Further, in the stator of the second embodiment, the fitting portion 142 provided in the yoke portion 141 of the split core 140 extends obliquely outward with respect to the direction orthogonal to the joint surface 143. As a result, the fitting portion 142 is less likely to be disengaged from the force acting on the split core 140 in the direction orthogonal to the joint surface 143, so that the coupling force between the split cores 140 can be maintained.

In the stator of the second embodiment, the radial outer straight portion L31 of the two straight portions L31 and L32 of the convex portion 141a has an angle θ1 formed with respect to the joint surface 143 of 85 deg, but is convex. Of the two straight portions L31 and L32 of the portion 141a, the linear portion L31 on the outer side in the radial direction has an angle θ1 formed with respect to the joint surface 143.
81deg ≤ θ1 ≤ 89deg
It may be within the range of. In this case, the radial outer straight portion L41 of the two straight portions L41 and L42 of the recess 141b has an angle θ2 formed with respect to the joint surface 143.
θ2 = 180deg−θ1
Will be.

In the first and second embodiments, the yoke portions 41,141 of the divided cores 40, 140 arranged in an annular shape are connected by the fitting portions 42, 142, but the shapes of the fitting portions are not limited to this, and they are not limited to each other. Any fitting structure may be used as long as it is provided on the joint surface side where the yoke portions of the adjacent split cores are connected to each other in the radial direction from the teeth portion side.

Further, it is preferable that the end of the fitting portion is located radially inside the joint surface of the yoke portion of the split core with respect to the center between the radially outer end and the radial inner end of the stator core. In this case, a part of the fitting portion on the side opposite to the joint surface is a virtual circle centered on the center of the stator core, and is between the radial outer end and the radial inner end of the joint surface. It may be located radially outside the virtual circle passing through the center of.

Although the specific embodiments of the present disclosure have been described, the present disclosure is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the present disclosure.

1 ... stator 2 ... rotor 3 ... shaft 10 ... stator core 11 ... insulator 12 ... coil 13 ... mold resin part 14 ... bearing 15 ... mounting base 16 ... cover 17 ... bearing housing 18 ... bearing 20 ... mold resin 21 ... back yoke 22 ... Magnet 23 ... Connecting member 30 ... Stator yoke 31,131 ... Teeth part 40,140 ... Divided core 41,141 ... Yoke part 41a, 141a ... Convex part 41b, 141b ... Recessed part 42,142 ... Fitting part 43,143 ... Joining Surfaces 44A to 44G ... Caulking 47,48,147,148 ... Caulking 50 ... Insulator 100 ... Motors L11, L12, L21, L22, L31, L32, L41, L42 ... Straight parts C11, C21, C31, C41 ... Arc parts ( Curved part)

Claims (7)

It comprises a stator core (10) having a plurality of split cores (40,140) arranged in an annular shape.
The split core (40,140) projects from the yoke portion (41,141) inside the stator core (10) in the radial direction and the yoke portion (41,141) to the outside in the radial direction of the stator core (10). It has a teeth part (31,131) and
On the joint surface (43,143) side where the yoke portions (41,141) of the split cores (40,140) adjacent to each other are connected to each other, the diameterwise inside of the teeth portion (31,131) side. The fitting portion (42,142) is unevenly provided in the.
The fitting portion (42,142) includes a convex portion (41a, 141a) provided on one side of the yoke portion (41,141) in the circumferential direction of the stator core (10) and the yoke portion (41, 141). 141) has recesses (41b, 141b) provided on the other side in the circumferential direction, and has a recess (41b, 141b).
Each of the convex portion (41a, 141a) and the concave portion (41b, 141b) forms a predetermined angle from one end on the joint surface (43,143) side with respect to the joint surface (43,143). Two straight portions (L11, L12, L21, L22, L31, L32, L41, L42) extending respectively and parallel to each other and the two straight portions (L11, L12, L21, L22, L31, L32, L41, L42) The stator (1) is characterized by having curved portions (C11, C21, C31, C41) that are connected to each other and bulge on the side opposite to the joint surface (43,143) side. In the stator (1) according to claim 1,
The stator (1) is characterized in that the two straight portions (L11, L12, L21, L22) form an angle of 90 deg with respect to the joint surface (43). In the stator (1) according to claim 1,
The radial outer straight portion (L31) of the two linear portions (L31, L32) of the convex portion (141a) has an angle θ1 formed with respect to the joint surface (143) of 81 deg or more and 89 deg or less. With
The radial outer straight portion (L41) of the two straight portions (L41, L42) of the recess (141b) has an angle θ2 formed with respect to the joint surface (143) of (180deg−θ1). The stator (1), characterized in that. In the stator (1) according to any one of claims 1 to 3,
At the joint surface (43,143) of the yoke portion (41,141) of the split core (40,140), the diameter is larger than the center between the radial outer end and the radial inner end. The stator (1), characterized in that the ends of the fitting portions (42, 142) are located inside in the direction. In the stator (1) according to any one of claims 1 to 4.
The stator (1) is provided with a coil (12) wound in a concentrated winding around the teeth portion (31,131) of the stator core (10). In the stator (1) according to any one of claims 1 to 5,
The stator (1) is characterized in that the fitting portions (42, 142) are provided with caulking (44A to 44G) on at least one of the upper end surface and the lower end surface of the stator core (10). The stator (1) according to any one of claims 1 to 6,
A motor (100) including a rotor (2) arranged so as to face the outer side of the stator (1) in the radial direction.