JPH03284145A - Laminated iron core for rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate the positioning of a bearing bracket by using a constitution such that the cut face of a projection engages with the inner periphery or the outer periphery of the spigot for positioning a bearing bracket. CONSTITUTION:A laminated iron core 11 is constituted by laminating many battens 12. Plural pieces of projections 13 are made in the circumferential direction with the directions of projections reversed alternately at the batten 12. At one end face of the laminated iron core 11 is set a bearing bracket 17 in such a manner that the outer periphery of the spigot part 19 is a little press-fit to the cut face on the periphery side of the projection 13. At the other end face of the laminated iron core 11 is set a bearing bracket 18 in such a manner that the inner periphery of the spigot part 19 is a little press-fit to the cut face on the periphery side of the projection 13. Hereby, both bearing brackets 17 and 18 can be mounted with high accuracy to both end faces of the laminated iron core 11.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a laminated iron core for a rotating electric machine, which is constructed by connecting a large number of punched plates in a laminated state through protrusions, and particularly relates to This relates to a bearing bracket that supports a rotor shaft attached to the rotor shaft.

There are those with frames and those without. For those with a stator frame, the laminated core that makes up the stator is press-fitted into the stator frame, and for the one that does not have a stator frame, end plates are welded to both ends of the laminated core that makes up the stator. Fixed. Then, a spigot part is formed on the stator frame or end plate,
By fitting the spigot part of the bearing bracket into this spigot part, the laminated core of the stator and the bearing bracket, as well as the stator and rotor, can be assembled with high concentric precision.

As a specific example, FIG. 17 shows an electric motor without a stator frame. 17, 1 is a laminated core of the stator, 2 is an end plate having a spigot part 3, 4 is a bearing bracket positioned by fitting the spigot part 5 into the spigot part 3 of the end plate 2, and 6 7 is a bearing fitted into this bearing bracket 4, and 7 is a rotating shaft of a rotor 8 supported by this bearing 6.

(Problems to be Solved by the Invention) The conventional structure described above requires a stator frame or an end plate in order to achieve concentric precision between the laminated core of the stator and the bearing bracket. However, the stator frame is large in size, and the inner peripheral surface into which the laminated core is press-fitted must also be machined with high precision, which increases the manufacturing cost of the stator frame and also increases the work cost for press-fitting the laminated core.

On the other hand, in the case without a stator frame, the end plate 2 must be welded while being adjusted so that the spigot part 3 is concentric with the laminated core 1, which is extremely time-consuming and costly. , the laminated core may become distorted due to the heat during welding.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to enable the use of protrusions for connecting punched plates as pilot parts, which can be press-fitted into the stator frame or used to connect end plates. To provide a laminated iron core for a rotating electrical machine that does not require fixing by welding and can also eliminate end plates.

[Structure of the Invention] (Means for Solving the Problems) The laminated core for a rotating electric machine of the present invention has a protrusion formed on a punched plate, with at least both sides separated from the punched plate by two cutting surfaces, and the protrusion is The punched plates are connected in a stacked state by fitting into the recess on the back side of the protrusion in another overlapping punched plate, and the protrusion is connected so that the two cut surfaces are aligned in the radial direction of the punched plate, and Of the two cut surfaces, the outer cut surface is inscribed in the inner circumferential surface of the pilot part for positioning the bearing bracket that supports the rotor shaft, or the inner cut surface is inscribed in the outer circumferential surface of the pilot part. It is characterized in that a plurality of them are formed so as to be in circumscribed positions.

In addition, a protrusion is formed on the punched board, which has a bridge shape on both sides connected to the punched board, and has a pair of protrusions protruding in opposite directions at the center, and this protrusion is used to connect other punched boards to be overlapped. The punched plates are connected in a stacked state by fitting into the recess on the back side of the protrusion, and the pair of projecting pieces protrude toward the outer circumference and the center of the punched plate, and The tip surface of the protruding piece that protrudes in the outer circumferential direction of the protruding piece is inscribed in the inner circumferential surface of the spigot part for positioning the bearing bracket that supports the rotor shaft, or protrudes toward the center of the punched plate. It is also possible to form a plurality of projecting pieces such that their tip surfaces are in circumscribed contact with the outer circumferential surface of the spigot part.

In this case, in a punched plate having radiation fins on the outer periphery, the protrusions are preferably formed at the base of the radiation fins or in the radiation fins.

(Function) Since the protrusion can be used as a spigot part on the side of the laminated core, there is no need to press fit it into the stator frame or fix the end plate by welding.

Furthermore, when the protrusions are provided at the base of the radiation fins or in the radiation fins, there is no possibility of affecting the flow of magnetic flux, so that a highly efficient laminated core with less loss can be obtained.

(Example) Hereinafter, the present invention will be specifically explained with reference to Examples.

First, a first embodiment shown in FIGS. 1 to 4 will be described. A laminated core 11 is constructed by laminating a large number of punched plates 12 obtained by punching, for example, an electromagnetic steel plate using a press. A large number of heat dissipating fins 1 are provided on the outer periphery of the punched plate 12.
2a are formed radially.

Now, the punching board 12 has a first protrusion 13 and a second protrusion 1.
4 are formed alternately along the circumferential direction.

As shown in FIG. 3, the protruding directions of both protrusions 13 and 14 are determined to be opposite to each other, with the first protrusion 13 protruding from one surface of the punching plate 12, and the second protrusion 14 protruding from one surface of the punching plate 12. protrudes from the opposite surface of the punching plate 12. Note that the protrusion amount of the protrusions 13 and 14 is several millimeters.

Both protrusions 13 and 14 are formed into a substantially "H" shape by so-called cutting and raising, and as is clear from FIG. 4, three sides are cut off from the punching board 12, and the remaining one side are connected as one. Cut surfaces 13 on two opposing sides of the three sides cut off from the punched board 12
a and 13b, 14a and 14b are parallel to each other.

These two parallel cut surfaces 13a and 13b114a
and 14b are arranged in parallel along the radial direction of the punched plate 12, with the cut surfaces 13a and 114a on the inner peripheral side, and the cut surfaces 13b, 1.
4b is the outer peripheral side. And these protrusions 13.
By cutting and raising 14, there are long holes 15 and 16 in the punching plate 12.
is occurring.

As shown in FIG. 2, the positions at which these protrusions 13.14 are formed are such that the cut surfaces 13b, 14b on the outer circumferential side have a diameter equal to the inner diameter dimension D1 of the pilot part 19 of the bearing bracket 17.18 in FIG. It is determined to be located above the circle S. Further, the cut surfaces 13a and 13b, 14a and 14b of the protrusions 13.14 are formed into arcuate surfaces centered on the center of the punched plate 12. Therefore, long hole 1
5.16 also has an arc shape.

These projections 13 and 14 are formed by cutting and raising the punching board 12 in the process of progressive press working, and when the punching board 12 is punched out from the strip, the projections 14 of the punched board 12 are punched out first. The recess on the back side of the protrusion 14 of the punched plate 12 that has been punched out, in this embodiment, is fitted into the elongated hole 16 with a slight press fit, and the protrusion 13 of the punched plate 12 punched earlier is inserted into the punched plate 12 punched later. The punched plates 12 are fitted into the elongated holes 15 with a slight press fit, whereby the punched plates 12 are connected to each other, and the laminated iron core 11 is integrated.

In the laminated core 11 consisting of a large number of punched plates 12 that are interconnected by fitting the protrusions 13.14 and the elongated holes 15.16, the protrusions 13.14 protrude in mutually opposite directions. As shown in FIG. 3, a protrusion 13 protrudes from one end face of the laminated core 11, and a protrusion 13 protrudes from the other end face.
4 (not shown in the figure) protrudes. And the first
As shown in the figure, a bearing bracket 17 is fitted onto one end surface of the laminated core 11 so that the inner circumferential surface of the spigot portion 19 thereof is slightly press-fitted into the cut surface 13b on the outer circumferential side of the protrusion 13. Further, on the other end surface of the laminated core 11, another bearing bracket 18 is fitted so that the inner peripheral surface of its spigot part 19 (not shown) is pressed into the outer peripheral cut surface 14b of the protrusion 14. . As a result, both bearing brackets 17 and 18 are mounted on both end surfaces of the laminated iron core 11 with high concentric precision. and,
Both bearing brackets 17.1g are fixedly integrated with the laminated iron core 11 by being tightened with through bolts 2o. Bearings 21 are attached to both bearing brackets 17 and 18 that are integrated with the laminated iron core 11 in this way.
is mounted, and the rotating shaft 2B of the rotor 22 is supported on this bearing 21.

As described above, according to this embodiment, the protrusions 13.
14 as the spigot part on the side of the laminated iron core 11, and the protrusion 1
3.14 is positioned by fitting into the spigot part 19 of the bearing bracket 17.18, so the laminated core 11 can be press-fitted into the stator frame with the spigot part, or the end plate with the spigot part can be fixed by welding. You don't have to do it. Therefore, the number of parts is reduced and assembly can be performed in a short time. Moreover, since the bearing bracket 17.18 is directly positioned by the protrusions 13.14 of the laminated core 11, the laminated core 11 and the bearing bracket The concentric accuracy with 17.1g becomes higher.

In the above embodiment, the protrusions 13 and 14 are connected to the spigot part 19.
Although the bearing brackets 17.18 are positioned by fitting the protrusions 13.14 onto the inner periphery of the spigot part 19, the protrusions 13.14 may also be fitted onto the outer periphery of the spigot part 19. In this case, the protrusions 13. The formation position of 14 is the cut surface 1 on the inner circumferential side.
3 a s 14 a is determined to exist on a circle having the same size as the outer diameter of the spigot part 19.

5 and 6'' show a second embodiment, in which when the protrusion 13.14 of the first embodiment is fitted to the inner peripheral surface of the spigot part 19 of the bearing bracket 17.18, This corresponds to the case where the protrusions 13 and 14 alone are insufficient in terms of strength.

In this embodiment, a plurality of auxiliary punched plates 24 having a shape obtained by removing the radiation fins 12a of the punched plate 12 are attached to both ends of the laminated core 11. The outer diameter of the auxiliary punching plate 24 is set to be equal to the inner diameter D1 of the spigot part 19, and a notch 25 that fits into the projection 13 or 14 is formed on the outer periphery thereof. A plurality of auxiliary punching plates 24 are attached to both ends of the laminated core 11 by fitting the notches 25 into the projections 13 or 14.

At both ends of the laminated core 11 to which the auxiliary punching plates 24 are attached, the inner circumferential surface of the pilot part 19 is fitted with protrusions 13.14.
By fitting into the auxiliary punching plate 24, the bearing brackets 17, 18 are installed in position.

7 and 8 show a third embodiment, in which when the protrusion 13.14 of the first embodiment is fitted to the outer peripheral surface of the spigot part 19 of the bearing bracket 17.18, the protrusion 13. This is for cases where the strength is insufficient with only .14.

In this embodiment, a plurality of auxiliary punching plates 26 having a shape without the slot 12b portion of the punching plate 12 are attached to both ends of the laminated core 11. The inner diameter dimension of this auxiliary punching plate 26 is set equal to the outer diameter dimension D2 (see FIG. 1) of the spigot part 19, and a notch 27 that fits into the projection 13 or 14 is formed on the inner circumference thereof. . Then, by fitting the notches 27 into the protrusions 13 or 14, the auxiliary punching plates 2 are attached to both ends of the laminated core 11.
6 are attached in multiple numbers. At both ends of the laminated core 11 to which the auxiliary punching plates 26 are attached, a bearing bracket 17 is formed by fitting the outer peripheral surface of the spigot part 19 into the protrusion 13.14 and the auxiliary punching plate 26.
．． 18 is mounted in position.

FIG. 9 shows a fourth embodiment that deals with the case where, for example, only the protrusions 13 are provided on the punched plate 12, instead of providing the protrusions 13 and 14 projecting in opposite directions as described in the first embodiment. Give an example.

In this embodiment, the laminated core 11 is divided into two parts, and one divided core 11a and the other divided core 11b are placed back to back, so that the protrusions 13 protrude in opposite directions at both ends of the laminated core 11. It is something. Then, one bearing bracket 1 is attached to the protrusion 13 of one split iron core 11a.
Fitting the inner peripheral surface of the spigot part 3 of 7 and the protrusion 1 of the other split core 11b
3, the spigot part 19 of the other bearing bracket 18
By fitting the inner peripheral surfaces of the bearing brackets 17 and 18, the bearing brackets 17 and 18 are positioned and attached to both ends of the laminated iron core 11.

FIG. 10 shows a fifth embodiment, in which the spigot portions 19 of the bearing bracket 17.18 are not directly fitted into the projections 13.14 at both ends of the laminated core 11 of the first embodiment, but instead By fitting the annular groove 30 as a pilot part formed in the end plate 28.29 into 13.14, the end plate 28.29 is attached to both ends of the laminated core 11 in a positioned state, and further these end plates 28 The spigot part 19 of the bearing bracket 17.18 is fitted into the spigot part 31 of .29.

Even with this configuration, unlike the conventional case, the end plate 28.2
It is not necessary to fix the laminated iron core 9 by welding while adjusting it so that it is concentric with the laminated iron core 11, and it is possible to reduce costs and to inherently prevent the laminated iron core 11 from deforming due to heat. .

11 and 12 show the sixth and seventh embodiments in which the shapes of the protrusions are different. Protrusions 32 and 33 in both embodiments
is separated from the punching board 12 at two cut surfaces, an inner circumference side cut surface and an outer circumference side cut surface of the punching plate 12, and the image side in the circumferential direction is integrally connected to the punching plate 12. And the first
The protrusion 32 in FIG. 1 has a substantially V-shaped protrusion, and the protrusion 33 in FIG. 12 has a substantially trapezoidal shape.

13 to 16 show an eighth embodiment, which will be explained below. In Figure 13, punching board 1
A plurality of first protrusions 34 and second protrusions 35 are alternately formed at the root portion of the second heat dissipation fin 12a with a small circle as the outer edge. As shown in FIG. 14, the protruding directions of both protrusions 34 and 35 are determined to be opposite to each other, with the first protrusion 34 protruding from one surface of the punching plate 12, and the second protrusion 35 protruding from one surface of the punching plate 12. protrudes from the opposite surface of the punching plate 12.

As shown in FIG. 15, both protrusions 34 and 35 are separated from the punched plate 12 on both sides, and are integrally connected to the punched plate 12 on other sides perpendicular to the separated sides, forming a bridge shape as a whole. I am doing it. A pair of protruding pieces 36.37 are formed in the center of these protrusions 34.35 so as to protrude in opposite directions, and these protrusions 36.37 gradually become wider toward the protruding pressure end. The side edges are formed in an arc shape, and the tip surfaces 36a, 3
7a is also formed in an arc shape.

Thus, the protrusions 34 and 35 are formed such that the protruding direction of one protruding piece 36 is in the direction of the outer circumference of the punched plate 12, and the protruding direction of the other protruding piece 37 is in the direction of the center of the punched plate 12. . A predetermined plurality of protrusions 34 and 35 are formed at the distal end surface 3 of the protrusion portion 36 facing toward the outer circumference.
6a is the bearing bracket 17.1g shown in FIG.
The inner diameter of the spigot part 19 is inscribed in a circle S2 having a diameter of .

These protrusions 34 and 35 are formed by cutting and raising the punched board 12 in the process of progressive press working, and when the punched board 12 is punched out from the strip, the protrusions 35 of the punched board 12 Section 36.37 is
A recess on the back side of the protrusion 35 of the previously punched board 12,
In this embodiment, the punched plate 1 is
2 and the protruding pieces 36 and 37 are connected to the bridge part 3.
9.40 by separating it from the bridge section 39.
The protrusion 34 of the punched plate 12 that was previously punched out fits between the cut surface 39 a and the cut surface 39 a of the punched plate 40 .
It fits between the hole 38 of the punched plate 12 punched later and the cut surface 39a%40a formed in the bridge portion 39.40, thereby connecting the punched plates 12 more firmly to each other, and forming the laminated iron core. 11 and is in an integrated state.

In the laminated core 11 consisting of a large number of punched plates 12 connected in this way, the protrusions 34 and 35 protrude in opposite directions, so that one side of the laminated core 11 is formed as shown in FIG. A protrusion 34 protrudes from one end face, and a protrusion 35 (not shown in the figure) protrudes from the other end face. 7. The bearing bracket 17 is attached to one end surface of the laminated core 11 by fitting the inner circumferential surface of the spigot part 19 to the tip surface 37a of the protruding piece 37 of the protrusion 34.
It is fixed concentrically with 1. Further, another bearing bracket 18 is attached to the other end surface of the laminated core 11 by fitting the inner circumferential surface of the spigot part 19 into the tip surface 37a of the protruding piece 37 of the protrusion 35, so that the other bearing bracket 18 is concentric with the laminated core 11. fixed in state.

Even with this configuration, the same effects as in the first embodiment can be obtained, and the protrusions 34.35 can connect the punched plates 12 more firmly. Since the projection 34 is formed in the
．． 35 has no adverse effect on the flow of magnetic flux in the laminated core 11, and the laminated core 11 can have low loss and high efficiency.

Note that the protrusions 34 and 35 may be formed in the radiation fin 12a. In this case as well, there is no fear that the protrusions 34, 35 will have an adverse effect on the flow of magnetic flux in the laminated core 11, and the laminated core 11 can have low loss and high efficiency. In addition, since the radiation fins 12a are more firmly bound together by the projections 34, 35, it is possible to prevent noise generation due to resonance of the radiation fins 12a.
A low-noise laminated core is formed.

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects can be obtained.

In the laminated iron core for a rotating electric machine according to claim 1, the cut surface of the protrusion fits into the inner circumferential surface or outer circumferential surface of the spigot part for positioning the bearing bracket. In laminated iron cores for electrical machinery, the projecting piece of the protrusion fits into the inner or outer circumferential surface of the spigot part for positioning the bearing bracket, making it possible to utilize the protrusion to connect the punched plates. The bearing bracket can be positioned, and there is no need to press fit it into the stator frame or weld and fix the end plates. You can connect them more firmly.

In the laminated core for a rotating electric machine according to claim 3, in the punched plate having heat dissipating fins on the outer periphery, the protrusion is formed at the base of the heat dissipating fin or in the heat dissipating fin, which may affect the flow of magnetic flux. Since this eliminates this, it is possible to obtain a highly efficient laminated core with less loss.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway side view of the electric motor, FIG. 2 is an enlarged front view of the laminated core, and FIG. 3 is a partially cutaway side view of the motor. FIG. 4 is an enlarged longitudinal cross-sectional view showing a state in which the punched plates are connected by the protrusion, and FIG. 4 is an enlarged perspective view of the protrusion. 5 and 6 are a front view and a partial longitudinal sectional side view of a laminated core showing a second embodiment of the present invention, and a seventh embodiment of the present invention is shown in FIGS.
8 and 8 are views corresponding to FIGS. 5 and 6 showing a third embodiment of the present invention, FIG. 9 is a vertical sectional side view showing a fourth embodiment of the present invention, and FIG. 10 is a view corresponding to FIGS. 11 and 120 are longitudinal sectional side views showing the sixth and seventh embodiments of the present invention, and FIGS. 13 to 16 are exploded longitudinal side views showing the fifth embodiment of the present invention. FIGS. 2 to 4 and 1 are views corresponding to FIG. 1, and FIG. 17 is a view corresponding to FIG. 2, showing an embodiment in which projections for spigots and projections for bundling heat radiation fins are provided. FIG. 18 is a diagram corresponding to FIG. 1 showing a conventional example. In the figure, 11 is a laminated core, 12 is a punched plate, and 1314 is a first
．． 2nd projection, 15.16 is a long hole, 17.18 is a bearing bracket, 19 is a spigot part, 22 rotor, 24
．． 26 is an auxiliary punching plate, 28.29 is an end plate, 30 is an annular groove (spigot part), 3.2.33 is a protrusion, 34.35 is a first. The second protrusion 36.37 is a protruding piece.

Claims (1)

[Claims] 1. A protrusion is formed on the punched plate, and the protrusion is separated from the punched plate by at least two cutting surfaces on both sides, and this protrusion is fitted into a recess on the back side of the protrusion in another overlapping die cut plate. By this, the punched plates are connected in a laminated state,
The protrusion is arranged such that two cut surfaces are arranged in the radial direction of the punched plate, and of the two cut surfaces, the outer circumferential cut surface is on the inner circumferential surface of the spigot part for positioning the bearing bracket that supports the rotor shaft. 1. A laminated iron core for a rotating electric machine, characterized in that a plurality of laminated iron cores are formed so that the inner circumferential surface is inscribed or the cut surface on the inner circumferential side is circumscribed to the outer circumferential surface of the spigot part. 2. A protrusion is formed on the punched board, which has a bridge shape on both sides connected to the punched board, and has a pair of protrusions protruding in opposite directions at the center, and this protrusion is used to connect other punched boards to be overlapped. The punched plates are connected in a stacked state by fitting into the recess on the back side of the protrusion, and the pair of projecting pieces protrude toward the outer circumference and the center of the punched plate, and The tip surface of the protruding piece that protrudes in the outer circumferential direction of the protruding piece is inscribed in the inner circumferential surface of the spigot part for positioning the bearing bracket that supports the rotor shaft, or protrudes toward the center of the punched plate. A laminated iron core for a rotating electric machine, characterized in that a plurality of protruding pieces are formed such that the tip surfaces thereof are in circumferential contact with the outer circumferential surface of the spigot part. 3. The laminated iron core for a rotating electric machine according to claim 1 or 2, wherein the punched plate has a radiation fin on its outer periphery, and the protrusion is formed at the base of the radiation fin or in the radiation fin.