JP2002359940A - Stator core and dynamo-electric motor utilizing the same stator core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core which can reduce cost by using few number of components. SOLUTION: In the annular stator core, where the specified number of yoke members 11 are laminated with a plurality of yokes 11a, including a magnetic pole teeth 11c on one side coupled via a bending part and external end portions of the yokes 11a allocated on both ends of the yoke member 11, are coupled by bending the bending part 11b to locate the magnetic pole teeth 11c at the internal side, a projected part 11e is provided at the external end part of both yokes 11a allocated at both ends of each yoke member 11. In this case, a coupling hole 18 is formed to the projected part 11, by overlapping the yoke members 11 under the condition that these yoke members 11 be formed in annular shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core formed by bending a bent portion of a laminated yoke member to form an annular shape, and a rotary motor to which the stator core is applied. The present invention relates to a structure of a positioning portion disposed near a bent portion.

[0002]

2. Description of the Related Art FIG. 15 is a plan view showing the configuration of a conventional rotary motor of this kind disclosed in, for example, Japanese Patent Application Laid-Open No. 8-19196. In the drawing, reference numeral 1 denotes a plurality of yoke portions 1a.
A bent portion 1b for connecting the respective yoke portions 1a in a bendable manner; a magnetic pole taste portion 1c formed to project from one side of each yoke portion 1a; and a magnetic pole taste portion 1c between adjacent yoke portions 1a. In the state in which a yoke member to be described later is formed in an annular shape and protrudes in a semicircular arc shape from an end on the side where is formed, a protruding portion 1e forming an annular portion 1d for positioning is located at both ends. A plate-like yoke comprising a projecting portion 1g forming an annular portion 1f for connection in a state in which a yoke member to be described later is formed in an annular shape so as to project from the outer end of the yoke portion 1a in a semicircular shape, and a yoke member described later is formed in an annular shape. It is a member.

[0003] Reference numeral 2 denotes a stator core formed by laminating a predetermined number of yoke members 1 and bending each bent portion 1b so that the side on which the magnetic pole teeth portion 1c is formed faces inward. A plurality of coils 4 respectively wound around each magnetic pole tooth 1c is a storage container arranged so as to surround the stator core 2, and a plurality of mounting holes 4a are provided in an outer peripheral portion. 5 is each mounting hole 4a of the storage container 4
The storage container 4 is formed on the base 5 by tightening a screw member (not shown) to each of the screw portions 5a of the base 5 through each of the mounting holes 4a. It is fixed to. Reference numeral 6 denotes a rotor disposed at the center of the stator core 2 and rotatably mounted on the base 5. The stator 7 is constituted by the stator core 2 and the coil 3, and the rotary electric motor 8 is constituted together with the rotor 6.

[0004]

SUMMARY OF THE INVENTION Conventional stator core 2
Is configured as described above, and is fixed and stored in the storage container 4 by, for example, bonding. Therefore, as the storage container 4 is required, the number of parts increases and the cost increases. For this reason, as shown in FIG. 16, for example, the yoke member 1 is directly fixed on the base 5 by the screw member 9 via the positioning annular portion 1d and the connecting annular portion 1f.
Although it is conceivable to make the storage container 4 unnecessary, as shown in FIG. 17, the annular portion 1d for positioning is loosened due to the springback of the material of the stator core 2, and it is not easy to obtain roundness. Ring part 1 for connection by vibration
There is a problem that f may come off.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and enables positioning and connection of a stator core without using a storage container or the like, thereby reducing the number of parts and cost. It is an object of the present invention to provide a stator core capable of performing the above-described operations and a rotary electric motor to which the stator core is applied.

[0006]

According to a first aspect of the present invention, there is provided a stator core comprising a plurality of yoke members each having a plurality of yoke portions each having a magnetic pole taste portion connected to each other via a bent portion, In the stator core formed in an annular shape by bending the bent portion so that the magnetic pole taste portion is on the inner side and connecting the outer ends of the yoke portions disposed at both ends of the yoke member, the stator core is disposed at both ends of each yoke member At the outer ends of the two yoke portions, projecting portions are formed which overlap with each other in a state where the yoke members are formed in an annular shape to form a connection hole.

A stator core according to a second aspect of the present invention is characterized in that, in the first aspect, the stator core is formed to protrude in an arc shape in the bending direction of the bent portion from the ends of the yoke portions adjacent to each other in the connecting direction. In the state in which the yoke member is formed in a ring shape, the tip portions of the yoke members overlap with each other to form a projection for forming a positioning hole.

According to a third aspect of the present invention, in the stator core according to the first aspect, each of the yoke portions adjacent to each other in the connecting direction protrudes in an arc shape in the bending direction of the bent portion from one of the ends. In this state, each of the yoke members is formed in a ring shape, and is provided with a projection for forming a positioning hole.

According to a fourth aspect of the present invention, in the stator core according to the third aspect, the protruding portions are formed to protrude from both ends of the same yoke portion.

According to a fifth aspect of the present invention, in the stator core according to the first or second aspect, the yokes are adjacent to each other except for the yoke members at both ends in the laminating direction in a state where each yoke member is formed in a ring shape. One of the protruding portions that are protruded from the portions and overlap each other is cut out.

According to a sixth aspect of the present invention, in the stator core according to the fifth aspect, the protruding portion is formed on a surface of the protruding portion of one of the yoke members adjacent to the yoke member having the protruding portion. On the side of the missing yoke member, there is provided a projection which is substantially equal to or less than the thickness of the yoke member and protrudes.

A rotary motor according to a seventh aspect of the present invention includes: a base having a fixing projection projecting at a predetermined position;
2. The stator core according to claim 1, wherein the connecting hole is mounted on the fixing protrusion of the base and is mounted on the base, a plurality of coils wound around each of the magnetic pole teeth of the stator core, and a center of the stator core. And a rotor rotatably mounted on the base.

According to a further aspect of the present invention, there is provided a rotary motor, wherein a plurality of fixing protrusions are provided at predetermined positions, and a plurality of connecting and positioning holes are provided for fixing the base. 4. The stator core according to claim 2, which is fitted on the projection and installed on the base, a plurality of coils wound around each of the magnetic pole teeth of the stator core, and arranged on the center of the stator core and rotated on the base. And a rotatably installed rotor.

According to a ninth aspect of the present invention, there is provided a rotary electric motor according to the seventh or eighth aspect, wherein the fixing projection is a pin member projecting from the base.

According to a tenth aspect of the present invention, in the rotary electric motor according to the seventh or eighth aspect, the fixing protrusion is a cylindrical member formed on the base and integrally formed with the base. .

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a plan view showing the configuration of the rotary motor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing the configuration of the rotary motor shown in FIG. 1 in an exploded manner, and FIG. 3 is an illustration showing the configuration of the stator core shown in FIG. FIG. 4 is a perspective view showing in detail the configuration of the connecting portion shown by arrows A and B in FIG. 3, FIG. 5 is a cross-sectional view showing the configuration of the fixing projection shown in FIG. 2, and FIG. FIG. 3 is a perspective view showing in detail a structure different from FIG. 4 of the connecting portion indicated by arrows A and B, and FIG. 7 is a sectional view showing a structure of the fixing projection shown in FIG. 2 which is different from FIG.

In FIG. 1, reference numeral 11 denotes a plate-like yoke member.
For example, as shown in FIG. 3, six yoke portions 11a and bent portions 11b connecting these yoke portions 11a in a bendable manner.
And one of the yoke portions 11a adjacent to each other in the connection direction, and the first yoke in the figure, and a magnetic pole taste portion 11c formed by protruding three pieces on one side of each yoke portion 11a. Pole taste portions 11c at both ends of the inner end of the portion 11a and the third and fifth yoke portions 11a.
And a first or seventh yoke 1
Annular protrusion 11e formed so as to protrude from the outer end of 1a
It is composed of

Reference numeral 12 denotes a predetermined number (five in the figure) of the yoke members 11 configured as described above,
1e is formed on the yoke member 11 and
The yoke member 11 on which 1e is formed is laminated in such a manner that two or three yoke members are separated from each other in the laminating direction. A bent stator core 13 is a plurality of coils wound around each of the magnetic pole teeth 11c.
Is composed. Reference numeral 14 denotes a base on which a rotor 15 is rotatably installed via a bearing (not shown) at a center portion, and reference numeral 16 denotes a projection on the base 14 at a predetermined interval on a circumference centered on the rotor 15. As shown in FIG. 5, a seat 16a is formed at a position in contact with the upper surface of the base 14 with the pin member serving as the fixing protrusion. Reference numeral 30 denotes a rotary electric motor composed of the rotor 15 and the stator 20.

Next, a method for assembling the rotary electric motor according to Embodiment 1 of the present invention configured as described above will be described with reference to the drawings. First, as shown in FIG.
1a, bent portion 11b, magnetic pole taste portion 11c, projecting portion 1
The plate-shaped yoke member 11 composed of 1d and the protruding portion 11e is sequentially punched, and a predetermined number, specifically, FIG.
As shown in the figure, the yoke member 11 having the protruding portion 11e formed on one end side and the yoke member 11 having the protruding portion 11e formed on the other end side are separated in the laminating direction into two and three pieces respectively. Although not shown, they are punched and caulked at the same time to be integrated.

Next, after winding the coil 13 around each magnetic pole tooth 11c, as shown in FIG.
The stator 20 is formed by sequentially bending the protrusions 1b and overlapping the protrusions 11e formed at both ends with each other to form an annular shape. At this time, the bending holes 11b cause the positioning holes 17 to be formed in the respective arc-shaped protrusions 11d.
Further, annular projecting portions 11e formed at both ends are overlapped with each other to form connecting holes 18 respectively. Finally, each of the holes 17 and 18 is fitted into the corresponding pin member 16 on the base 14 and is brought into contact with the seat 16a of the pin member 16 as shown in FIG. By crushing the tip of the pin member 16 as shown in (B), the stator 20 is fixed to each pin member 16 and the rotary electric motor 30 is completed.

As described above, according to the first embodiment, the annular projections 11e are provided at both ends of the yoke member 11, and the yoke members 11 are overlapped in a state of being formed in an annular shape, so that the connection hole 18 is formed. Since the hole 18 is formed and fixed by fitting it into the pin member 16 on the base 14, the connecting portion of the yoke member 11 does not come off due to vibration. Therefore, the number of parts can be reduced and the cost can be reduced.

Further, the yoke portion 1 adjacent to the yoke member 11
An arc-shaped protruding portion 11d is provided from either one end of each of the bending portions 11a to the bending direction of the bending portion 11b, that is, on the side where the magnetic pole teeth 11c are formed, and the yoke member 11 is positioned in an annular shape. Forming a hole 17 for
Since the holes 17 are fitted and fixed to the pin members 16 at the corresponding positions on the base 14, the positioning portions are not loosened, and it is not necessary to surround them with the storage container as described above. Therefore, not only can the cost be reduced, but also the roundness can be easily maintained.

Also, as shown in FIG. 3, an arc-shaped protruding portion 11d provided at one end of the adjacent yoke portions 11a is connected to the first inner end side from the left end of the yoke portion 11a. The first, third, and fifth yoke parts 1 are made to protrude from the third and fifth ends.
Since both ends of 1a are firmly positioned and fixed by the pin member 16, the second and fourth yoke portions 11a located in the middle can also maintain sufficient roundness with desired accuracy. Further, the fixing projection is formed on the base 1.
Since the pin member 16 protrudes from the top 4, highly accurate positioning is possible.

In the above configuration, as shown in FIG. 4, the yoke member 11 having the protruding portion 11e formed on one end, and the yoke member 11 having the protruding portion 11e formed on the other end,
Although the two yoke members 11 are stacked so as to be separated from each other in the stacking direction to form two or three sheets, the same effect as described above can be obtained by alternately stacking the two yoke members 11 as shown in FIG. It goes without saying that you get it. Further, the protruding portion 11e is formed in an annular shape, but may be formed in an arc shape so as to sufficiently surround the periphery of the pin member 16. Further, the fixing projection is formed into a tubular member 19 formed by pressing or the like integrally with the base 14 as shown in FIG. 7A, and the tip thereof is crushed as shown in FIG. 7B. The stator core 12 may be fixed, and since the tubular member 19 is formed integrally with the base 14 by pressing or the like, the productivity can be improved, the number of parts can be reduced, and the cost can be further reduced. Can be achieved.

Embodiment 2 8 is an exploded perspective view showing a configuration of a stator core of a rotary electric motor according to Embodiment 2 of the present invention, FIG. 9 is a perspective view showing in detail a configuration of a positioning portion indicated by an arrow A in FIG. 8, and FIG. FIG. 10 is a perspective view showing in detail a configuration different from that of FIG. 9 of the positioning portion indicated by an arrow A in FIG. 8. In the drawing, reference numeral 21 denotes a plate-like yoke member, for example, as shown in FIG. 8, six yoke portions 21a, a bent portion 21b for connecting these yoke portions 21a in a bendable manner, and one side of each yoke portion 21a. , A magnetic pole taste portion 21c formed by projecting three from each other, an annular projecting portion 21d formed by projecting from the outer end of the yoke portion 21a at one end in the connection direction, and an annular projecting portion 21d of each yoke portion 21a. Protruding portions 2 which are formed to protrude in an arc shape from the end on the side different from the side where the magnetic pole taste portion 21c is formed.
1e.

Reference numeral 22 denotes the yoke 2 configured as described above.
1 is a predetermined number (five in the drawing), that is,
Two pieces are stacked so that 1d is on one end side in the connection direction and three pieces are set on the other end side in the connection direction so as to be separated from each other in the stacking direction. The stator core is bent and formed in an annular shape so that the side to be formed is on the inside, and as shown in FIG. 9, a positioning hole 23 is provided between the yoke portions 21a by the respective projecting portions 21e so as to be connected to the connecting portion. Each of the projecting portions 21d has a connecting hole 24 formed therein.

As in the first embodiment, a coil is wound around each of the magnetic pole teeth portions 21c in a pre-process (not shown) before the stator core 22 is formed in an annular shape. Is configured.
Next, the stator is formed by fitting and fixing the positioning holes 23 and the connection holes 24 of the stator core 22 to respective pin members protruding at corresponding positions on the base. A rotary electric motor is configured together with the rotor installed on the base and also on the base.

As described above, according to the second embodiment, the annular projecting portions 21d are provided at both ends of the yoke member 21, and the yoke members 21 are overlapped in a state of being formed in an annular shape to form the connecting hole 24. The connecting portion of the yoke member 21 does not come off due to vibration because the hole 24 is fitted to and fixed to the pin member on the base. Therefore, the number of parts can be reduced and the cost can be reduced.

Also, arc-shaped protruding portions 21e are provided on the ends of the yoke portions 21a adjacent to each other in the connection direction on the side where the magnetic pole taste portions 21c are formed, and the yoke member 21 is formed in an annular shape. The projections 21e on both sides cooperate to form a positioning hole 23, and the holes 23 are fitted and fixed to the pin members at the corresponding positions on the base. Since the portion does not loosen further, and it is not necessary to surround the container with the storage container as in the above case, it is possible not only to reduce the cost but also to easily maintain the roundness.

In the above configuration, two yoke members 21 are arranged so that the protruding portion 21d is on one end, and the yoke members 2 are arranged so that the protruding portion 21d is on the other end.
3 are laminated so that they are separated in the laminating direction.
As shown in FIG. 9, two or three protruding portions 21e arranged on both sides respectively form the positioning holes 23, but are arranged such that the protruding portions 21d are on one end side. The yoke member 21 and the yoke members 21 arranged such that the protruding portions 21d are on the other end side are alternately laminated, and the positioning holes are formed by the protruding portions 21 arranged on both sides as shown in FIG. Even if the portion 23 is formed, the same effect as described above can be obtained.

Embodiment 3 FIG. 11 is a perspective view showing a configuration of a main part of a stator core of a rotary electric motor according to Embodiment 3 of the present invention, FIG. 12 shows a configuration of a main part of a stator core in FIG. 11, (A) is a plan view, and (B) Is a front view,
13 is a perspective view showing a configuration of a main part of a stator core of a rotary electric motor according to Embodiment 3 of the present invention, which is different from FIG. 11, FIG. 14 shows a configuration of a main part of the stator core in FIG. 13, and FIG. FIG. 2B is a front view.

In the figure, the same parts as those in the second embodiment are denoted by the same reference numerals, and the description is omitted. The stator core 22 according to the third embodiment has substantially the same configuration as the stator core 22 according to the second embodiment. However, as shown in detail in FIG. Among them, for example, the protruding portion 21e of the innermost yoke member 21 is cut out.

In general, the stator core 22 is coated with an insulating coating in a process prior to being formed in a ring shape and a coating film is formed on the surface. Since the surfaces interfere with each other, it is difficult to smoothly overlap the surfaces, and it is difficult to form the holes 23. Therefore, there is a problem that the assembling workability is reduced.

Therefore, as in the third embodiment, the protruding portion 21e of the innermost yoke member 21, for example, is cut out of the three yoke members 21 on the side where the three layers are stacked, so that Providing a gap (indicated by G in the drawing) prevents the surfaces of the protruding portions 21e from interfering with each other, thereby facilitating the formation of the holes 23 and improving the assembling workability. The yoke member 21 with the protruding portion 21e cut out is not limited to the innermost yoke member 21 among the three yoke members 21 stacked as described above. Is formed in an annular shape, except for the yoke members 21 at both ends in the stacking direction, and the same effect can be obtained as long as it is one of the protruding portions 21e that protrude from the adjacent yoke portions 21a and overlap each other. Can be.

As shown in FIG. 13 and FIG. 14, one of the yoke members 21 adjacent to the yoke member 21 in which the protruding portion 21e is notched, that is, as shown in detail in FIG. Yoke member 21 on the side where three sheets are stacked
Among them, for example, on the surface of the projecting portion 21e of the middle yoke member 21, on the yoke member 21 side where the projecting portion 21e is cut out, a plurality of protrusions having a thickness equal to or less than the thickness of the yoke member 21 and substantially the same height If the protrusions 25 are formed by, for example, a punching process, the gap G is maintained.
In addition to preventing interference between the surfaces of e, it is also possible to provide rigidity at the time of fixing, thereby improving reliability.

[0036]

As described above, according to the first aspect of the present invention, a predetermined number of yoke members each having a plurality of yoke portions each having a magnetic pole taste portion connected via a bent portion are stacked. In the stator core formed in an annular shape by bending the bent portion so that the magnetic pole taste portion is on the inner side and connecting the outer ends of the yoke portions disposed at both ends of the yoke member, the stator core is disposed at both ends of each yoke member The outer ends of the two yoke portions are provided with projections that overlap each other in a state where the yoke members are formed in an annular shape to form a connection hole, thereby reducing the number of parts and reducing costs. Can be provided.

According to a second aspect of the present invention, in the first aspect, each of the yokes is formed so as to protrude in an arc shape in the bending direction of the bent portion from the ends of the yokes adjacent to each other in the connecting direction. In the state where the members are formed in an annular shape, the tip portions of the members overlap each other to form a projection for forming a positioning hole, so that it is possible to provide a stator core capable of reducing the number of parts and reducing cost. it can.

According to a third aspect of the present invention, in the first aspect, each of the yoke portions adjacent to each other in the connection direction is formed to protrude in an arc shape in the bending direction of the bent portion from one of the ends. And, since each yoke member is provided with a protruding portion forming a positioning hole in a state formed in an annular shape,
A stator core capable of reducing the number of parts and reducing costs can be provided.

According to a fourth aspect of the present invention, in the third aspect, since the protruding portions are formed to protrude from both ends of the same yoke portion, the roundness can be sufficiently maintained. A stator core can be provided.

According to a fifth aspect of the present invention, in the first or second aspect, the yoke members are formed adjacent to each other except that the yoke members at both ends in the stacking direction are formed in a ring shape. Any one of the projecting portions that are projected from and overlap each other is cut out, so that it is possible to provide a stator core capable of improving productivity.

According to a sixth aspect of the present invention, in the fifth aspect, the protruding portion is notched on the surface of the protruding portion of one of the yoke members adjacent to the yoke member having the protruding portion. Since the projections are provided on the side of the yoke member having a thickness substantially equal to or less than the thickness of the yoke member and projecting, the productivity can be improved as well as the reliability. A stator core that can be improved can be provided.

According to the seventh aspect of the present invention, the base having the fixing projection projecting at a predetermined position and the connecting hole is fitted to the fixing projection of the base, and the base is provided on the base. Since the stator core according to claim 1 to be installed, a plurality of coils wound around each of the magnetic pole teeth portions of the stator core, and a rotor arranged at the center of the stator core and rotatably installed on the base, A rotary electric motor capable of reducing costs can be provided.

According to the eighth aspect of the present invention, a base having a plurality of fixing projections protruding at predetermined positions, and connecting and positioning holes formed in the base are each fixing projection. 4. The stator core according to claim 2, which is fitted on the base and installed on the base, a plurality of coils wound around each of the magnetic pole teeth portions of the stator core, and arranged on the center of the stator core so as to be rotatable on the base. With the provision of the rotor to be installed, it is possible to provide a rotary electric motor capable of reducing costs.

According to the ninth aspect of the present invention, in the seventh or eighth aspect, the fixing projection is a pin member projecting from the base, so that the rotary motor can be positioned with high accuracy. Can be provided.

According to the tenth aspect of the present invention, in the seventh or eighth aspect, the fixing projection is a cylindrical member formed on the base so as to project integrally with the base.
A rotary electric motor capable of improving productivity can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a rotary electric motor according to Embodiment 1 of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of the rotary electric motor in FIG. 1;

FIG. 3 is an exploded perspective view showing a configuration of the stator core shown in FIG. 1;

FIG. 4 is a perspective view showing in detail a configuration of a connecting portion indicated by arrows A and B in FIG.

FIG. 5 is a cross-sectional view showing a configuration of a fixing projection shown in FIG.

FIG. 6 is a perspective view showing in detail a configuration different from that of FIG. 4 of a connecting portion indicated by arrows A and B in FIG. 3;

7 is a cross-sectional view showing a configuration of the fixing projection shown in FIG. 2 which is different from FIG. 5;

FIG. 8 is an exploded perspective view showing a configuration of a stator core of a rotary electric motor according to Embodiment 2 of the present invention.

9 is a perspective view showing in detail a configuration of a positioning portion indicated by an arrow A in FIG.

10 is a perspective view showing in detail a configuration different from that of FIG. 9 of the positioning portion indicated by an arrow A in FIG. 8;

FIG. 11 is a perspective view showing a configuration of a main part of a stator core of a rotary electric motor according to Embodiment 3 of the present invention.

12 shows a configuration of a main part of the stator core in FIG. 11, (A) is a plan view, and (B) is a front view.

FIG. 13 is a perspective view showing a configuration of a main part of a stator core of a rotary electric motor according to Embodiment 3 of the present invention, which is different from FIG. 11;

14 shows a configuration of a main part of the stator core in FIG. 13, (A) is a plan view, and (B) is a front view.

FIG. 15 is a front view showing a configuration of a conventional rotary electric motor.

FIG. 16 is a front view showing a configuration of a conventional rotary motor different from that of FIG. 15;

FIG. 17 is a plan view for explaining a problem of the stator core of the rotary electric motor in FIG. 16;

[Explanation of symbols]

11, 21 yoke member, 11a, 21a yoke part,
11b, 21b bent portion, 11c, 21c magnetic pole taste portion, 11d, 21d, 11e, 21e projecting portion, 1
2,22 Stator core, 13 coil, 14 base, 15 rotor, 16 pin member, 17, 18, 2
3, 24 holes, 19 cylindrical member, 20 stator, 2
5 Projection, G gap.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H002 AA07 AB01 AC03 AC08 AE08 5H615 AA01 BB01 BB02 PP01 PP06 SS03 SS05 SS10 SS20

Claims (10)

[Claims] 1. A predetermined number of yoke members having a plurality of yoke portions each having a magnetic pole taste portion connected to each other via a bent portion are laminated, and the bent portion is bent so that the magnetic pole taste portion is on the inside. In the stator core formed in an annular shape by connecting outer end portions of the yoke portions disposed at both ends of the yoke member to each other, outer end portions of both yoke portions disposed at both ends of the yoke members are formed. A stator core, wherein the yoke member is formed in a ring shape and provided with a projection that overlaps with each other to form a connection hole. 2. The end portions of the yoke portions adjacent to each other in the connecting direction are formed to protrude in an arc shape in the bending direction of the bent portion, and the respective tip portions overlap each other in a state where each yoke member is formed in an annular shape. 2. The stator core according to claim 1, further comprising a projection that forms a positioning hole. 3. A positioning member which is formed so as to protrude in an arc shape in a bending direction of a bent portion from one end of the yoke portions adjacent to each other in a connecting direction, and each yoke member is formed in an annular shape. 2. The stator core according to claim 1, further comprising: a protrusion that forms the hole. 4. The stator core according to claim 3, wherein the projecting portions are formed so as to project from both ends of the same yoke portion. 5. In a state where each yoke member is formed in an annular shape, except for the yoke members at both ends in the stacking direction, one of the protruding portions that are respectively protruded from the adjacent yoke portions and overlap each other is cut out. The stator core according to claim 1, wherein the stator core is provided. 6. The surface of one of the yoke members adjacent to the yoke member having the notch protruded thereon is provided on the surface of the yoke member having the notch protruded therein at a thickness not more than the thickness of the yoke member. 6. The stator core according to claim 5, wherein a projection having substantially the same height is provided. 7. The stator core according to claim 1, wherein a base having the fixing projection projecting at a predetermined position and a coupling hole are fitted on the fixing projection of the base and installed on the base. And a plurality of coils wound around each of the magnetic pole teeth of the stator core, and a rotor disposed at the center of the stator core and rotatably mounted on the base. . 8. A base having a plurality of fixing projections projecting at predetermined positions, and connecting and positioning holes respectively fitted to the fixing projections of the base, and mounted on the base. 4. A stator core according to claim 2 or 3, wherein a plurality of coils are respectively wound around each of the magnetic pole teeth of the stator core, and a rotor which is disposed at the center of the stator core and rotatably mounted on the base. A rotary electric motor comprising: 9. The rotary electric motor according to claim 7, wherein the fixing protrusion is a pin member projecting from the base. 10. The rotary electric motor according to claim 7, wherein the fixing protrusion is a cylindrical member formed on the base and integrally protruding from the base.