JP2835091B2 - Method of manufacturing stator core for motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a stator for a motor manufactured by press-fitting connecting portions provided on an iron core body and a split iron core. The present invention relates to a method for manufacturing an iron core.

(Conventional technology) For example, in the case of the stator core of a shaded coil type motor,
As shown in FIG. 6, the iron core body 1 has a pair of protrusions 2 integrally on the outer side, and a trapezoidal protrusion 3 as a connecting portion is provided at the distal end of each of the protrusions 2 symmetrically. Are protruded integrally. On the other hand, trapezoidal concave portions 5 as connecting portions are formed symmetrically on both sides of one side surface of the split core 4. Then, the shading coil 6 is mounted on the iron core body 1, and the bobbin 8 on which the coil 7 is wound is inserted into the split iron core 4, and then the recess 5 is fitted into the projection 3 by press-fitting. The core body 1 and the split core 4 are integrated.

As shown in FIG. 7, the iron core body 1 and the split iron core 4 are formed by laminating a large number of laminated plates 1a and 4a made of electromagnetic steel sheets, and both laminated plates 1a and 4a are made of one sheet material. Is obtained by cutting and separating with a press die and a punch, so that the protrusion 3 and the recess 5 can be closely fitted.

When a plate material is cut by a die and a punch, as is well known, one of the upper and lower edges of the cut surface has an arc shape and the other has a flash shape. Therefore, this laminate
Even when 1a and 4a are cut and separated by a die and a punch, for example, in the case of the laminated plate 1a, if the upper edge at the time of cutting becomes an arc shape and the lower edge becomes a beam shape, lamination is performed. Conversely, in the plate 4a, the upper edge at the time of cutting becomes a flash shape, and the lower edge becomes an arc shape. Then, the laminated plates 1a and 4a are laminated as they are and a predetermined number of them are caulked and joined, and the core body 1 and the divided
Is configured as

In the iron core body 1 and the split iron core 4, since the both protrusions 3 and the two recesses 5 are formed symmetrically, respectively, when mounting the shading coil 6 and the bobbin 8,
It is no longer clear which of the front and back sides of the laminates 1a and 4a was on the upper side when the laminates 1a and 4a were cut. Of course, the discrimination can be made by looking at the cut surfaces of the laminates 1a and 4a in detail, but such discrimination work is difficult to execute from the viewpoint of workability. Therefore, when viewed from the front, the shading coil 6
When the laminated plate 1a is attached to the core body 1 in a positional relationship as shown in FIG. 6, the side of the laminated plate 1a at the time of pulling out may be the front side or the back side. There is also. Similarly, the laminated plate 4a of the split iron core 4 may have a front side at the time of dropping and a back side at the same time.

On the other hand, when press-fitting the concave portion 5 of the split core 4 into the protrusion 3 of the core body 1, as shown in FIG.
Since the lead wire holding portions 8a projecting from both sides of the bobbin 8 for holding 7a project from the split core 4 to the core body 1 side, the split core 4 is pushed down from above the core body 1. The protrusion 3 and the recess 5 are press-fitted. In FIG. 6, if the rotation direction of the rotor 9 is a counterclockwise direction, and if the rotation is in the reverse direction, only the iron core body 1 is turned upside down (the position of the The recess 5 of the split core 4 is press-fitted into the protrusion 3 in the state of being reversed left and right from FIG. 1, but in this case also, the split core 4 is pushed down from above the core body 1.

At the time of press-fitting the protrusion 3 and the recess 5 under the above-described circumstances, the arc-shaped edges of the cut surfaces of the laminates 2a and 4a may be press-fitted such that they contact each other first. However, as shown in FIG. 7, when the burrs are pressed into each other so that they come into contact with each other, the arc-shaped edges and the burrs are pressed into each other so that they come into contact with each other first. There is also.

(Problems to be Solved by the Invention) However, when the protrusions 3 and the recesses 5 are press-fitted, there is a case where the arc-shaped edges of the cut surfaces of the laminated plates 2a and 4a are press-fitted such that they come into contact first. Is good, especially the seventh
As shown in the figure, when the burrs are pressed into each other so that they come into contact with each other, the press-fitting lacks smoothness,
There is a gap between the projection 3 and the recess 5, which results in a problem that an electromagnetic sound is generated or a magnetic flux becomes difficult to pass, resulting in a reduction in efficiency.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an arc-shaped cut surface of each laminated plate of a core body and a split core when press-fitting a connection part of a core body and a connection part of a split core. It is an object of the present invention to provide a method for manufacturing a stator core of a motor that can be press-fitted such that edges contact each other first.

[Constitution of the Invention] (Means for Solving the Problems) The method for manufacturing a stator core of a motor according to the present invention has a plurality of connecting portions by cutting a single metal plate with a punch and a die. After forming a pair of laminated plates, the pair of laminated plates are respectively laminated to form an iron core body and a divided core, and after attaching a coil to the divided core,
A stator core of a motor manufactured by press-fitting a connection portion of the divided core into a connection portion of the core body by press-fitting, and the stator core of a motor manufactured by integrating the divided core with the core body. Forming the plurality of connecting portions asymmetrically, and when press-fitting the connecting portions of the split cores to the connecting portions of the core body, the connecting portions of the split cores are always constant in the press-fitting direction with respect to the core body. And press-fitting so that the arc-shaped edges of the cut surface by the punch and the die come into contact with each other first.

(Operation) Since the plurality of connecting portions of the core body and the divided cores are formed asymmetrically, the connecting portion allows either the front or back side to be an arc-shaped edge of the cut surface of the laminated plate, and any side to be a burr-shaped edge. Part can be easily identified. For this reason,
The arc-shaped edge portion and the burred edge portion can be in a fixed relationship. Then, when press-fitting the connection portion of the split core into the connection portion of the core body, if the connection portions of the split core are always positioned at a fixed side in the press-fitting direction, the core is press-fitted. Press-fitting can be performed such that the arc-shaped edges of the cut surface of the laminated plate constituting the main body and the split core come into contact with each other first.

(Embodiment) An embodiment of a shaded coil type motor to which the present invention is applied will be described below with reference to FIGS. 1 to 5.

First, the overall configuration of the shaded coil type motor shown in FIG. 1 will be described. The stator core 11 includes a core body 12 and a split core 13. A circular space (not shown) for arranging the rotor core is formed in the center of the core body 12, and a shading coil 14 is mounted on the upper right and lower left sides of the space. ing. A bracket 15 (only one is shown) is fixed to the front side and the back side of the iron core body 12 by rivets 16, and a rotor shaft 17 is supported by the bracket 16. A pair of projecting portions 18 are provided on both left and right sides of the lower outer portion of the core body 12.
Are integrally protruded in a facing state, and the pair of protruding portions
The split iron core 13 is attached between the two. The split iron core 13 has a plastic bobbin around which a coil 19 is wound.
The lead wire holding portion 20a is integrally provided on the left and right side surfaces on the front side of the bobbin 20.
Lead wires 21 connected to both ends of the coil 19 are held by the lead wire holding portion 20a. Unlike the conventional case, the lead wire holding portion 16a is formed so as not to protrude from the split core 13 to the core body 12 side. In addition, these two lead wires 21 are bound by
United by 22.

Here, the mounting configuration of the split core 13 to the projecting portion 18 of the core body 12 will be described. That is, both protruding portions of the iron core body 12
At the distal end of the trapezoid 18, trapezoidal projections 23 and 24 are formed at the center in the width direction of the projections 18 as connection parts. Of these two projections 23 and 24, an arc-shaped notch 23a is formed only in one projection 23 on the left side in FIG. 1, so that the projections 23 and 24 are configured to be asymmetric. ing. On the other hand, trapezoidal concave portions 25 and 26 are formed in the split core 13 as connecting portions matching the protrusions 23 and 24, respectively. Of these two concave portions 25 and 26, a projection 25a is formed only in one concave portion 25 on the left side in FIG. 1, so that the two concave portions 25 and 26 are configured to be asymmetric. Then, the protrusions 23 and 24 of the core body 12 and the recesses 25 and 26 of the split core 13 are fitted by press fitting, whereby the split core 13 is attached to the core body 12 and integrated.

FIG. 3 shows a shading coil type motor in which the rotation direction of the rotor is opposite to that of FIG. In this third motor, the same core body 12 as that shown in FIG. 1 to which the shading coil 14 is mounted is turned upside down as shown in FIG. 1 (therefore, the positional relationship of the shading coil 14 is shown in FIGS. 1 and 3). The left and right are reversed.) However, the only difference is that the split iron core 13 is turned upside down from FIG. That is, if one end of the rotor shaft 17 protruding frontward in FIG. 1 is the end connected to the load side, the one end protruding frontward also in FIG. The end is connected to the load side. 3, the lead wire 21 of the bobbin 20 is on the front side in the same manner as the lead wire 21 of the bobbin 20 is on the front side.

As shown in FIGS. 2 and 4, the iron core body 12 and the split iron core 13 are configured by laminating a number of laminated plates 12a and 13a made of electromagnetic steel sheets. The pair of laminated plates 12a and 13a are formed by cutting and separating one plate material using a press die and a punch, and connecting portions 23 to 26 are simultaneously formed in the cut and separated portion. Then, as shown in FIG. 1, the projection 2 with the notch 23a
When viewed from the front with the concave portion 25 with 3 and the projection 25a located on the left side, assuming that the laminated plate 12a has an arc-shaped edge on the front side and a burred edge on the back side,
Regarding the laminated plate 13a, the front side is a burred edge and the back side is an arc-shaped edge.

Next, a procedure for connecting the iron core body 12 and the split iron core 13 having the above configuration will be described. First, two shaded coils 14 are mounted on the iron core body 12 and a bobbin 20 is inserted into the split iron core 13. At the time of mounting the shading coil 14, the core body 12 is placed in a state where the protrusion 23 with the notch 23a is on the left side as shown in FIG.
Are mounted on the right and left lower portions of the rotor core space (not shown). Also, split iron core 13 into bobbin 20
When the bobbin 20 is used for a motor in which the rotation direction of the rotor shown in FIG. 1
As shown in the figure, the bobbin 20 is inserted so that the concave portion 25 with the protrusion 25a is on the left side, and when the rotation direction of the rotor shown in FIG.
The bobbin 20 is inserted so that the concave portion 25 with a is on the right side.

As described above, the shading coil 14 is mounted on the iron core body 12 and the split iron core 13 is inserted into the bobbin 20 and then integrated. At the time of this integration work, when the rotation direction of the rotor shown in FIG. 1 is a counterclockwise motor, the iron core body 12 is not shown so that the front side shown in FIG. The core 13 is set on a press-fitting device base, and the split core 13 is set on a lifting jig of the press-fitting device located above the iron core body 12 with the lead wire 21 lead-out side of the bobbin 20 facing upward. Therefore, as in this state shown in FIG. 5, burr-like rim portion B ₁₂ becomes lower arc-like rim portion C ₁₂ of laminate 12a is in the upper, the laminate 13a is
Arc-like rim portion C ₁₃ burrs edge B ₁₃ on the lower side becomes the upper side. Then, in this state, push down the split core 13 to
25 and 26 are pressed into the projections 23 and 24. At the time of this press-fitting, as is clear from the above description, the protrusion 25a is oriented in the press-fitting direction.
The recessed portion 25 with a groove is disposed on the left side, and the recessed portion 26 is press-fitted in a state of being located on the right side.
This is equivalent to press-fitting the iron core 13 into the iron core body 12 from the front side. Therefore, as is apparent from Figure 5, the laminate 11a of the core body 12 and the laminated plate 13a of the segment core 13, and if the arc-shaped portion C ₁₂ and C ₁₃ is press-fitted so as to abut against the previously .

When the motor shown in FIG. 3 rotates in the clockwise direction at the time of integrating the iron core body 12 and the split iron core 13, the iron core body 12 is moved forward as shown in FIG. 3 is set on the base of a press-fitting device (not shown) so that the front side shown in FIG. 3 is the upper side (the arc-shaped edge C ₁₂ of the laminated plate ₁₂ is the lower side), and the divided core 13 is bobbin. 20
So that the lead wire 21 lead-out side of the
The arc-like rim portion C ₁₃ is set to the lifting jig of the press apparatus located lower) the divided core 13 under the core body 12. In this state, the split iron core 13 is pushed up from below the iron core main body 12 in the opposite manner as described above, and the concave portions 25 and 26 are pressed into the protrusions 23 and 24.
At this time, the lead wire holding portion 20a of the bobbin 20 is
It is needless to say that the recesses 25 and 26 can be press-fit into the protrusions 23 and 24 from below because they do not protrude to the second side and do not interfere with the iron core body 12. At the time of such press-fitting, the split core 13 is turned upside down from FIG. 1, which is the same as being press-fitted from the back side of the core body 12 which is upside down from FIG. In the same manner as described above, the recess 25 with the projection 25a is located on the left side in the press-fitting direction, and the press-fitting is performed with the recess 26 located on the right side. It is the same as press-fitting 12 from the front side. Accordingly, the laminated plate 11a of the core body 12 and the laminated plate 13a of the divided core 13
Refers to what arcuate portion C ₁₂ and C ₁₃ is press-fitted so as to abut against the first.

As described above, according to the present embodiment, the two protrusions 23 and 24 of the iron core body 12 and the two recesses 25 and 26 of the split core 13 are formed asymmetrically, and the recesses 25 and 26 are press-fitted into the protrusions 23 and 24. When pressing, the recess 25 always has a recess on the left side in the press-fit direction.
Since 26 is pressed so that the right side, the copper-laminated plate 12a and 13a of the arcuate portions C ₁₂ and C ₁₃ and upon stuffing comes to abut against the first. For this reason, the projections 23 and 24 and the recesses 25 and 26
Can be tightly fitted in a state where no gap is generated, and there is no possibility that electromagnetic noise is generated or efficiency is lowered due to difficulty in passing magnetic flux.

In the above embodiment, the protrusions 23 and 24, the recesses 25 and 26
Are made asymmetric by changing the shape, but may be made asymmetric by changing the formation position even if the shape is the same.

[Effects of the Invention] As described above, according to the present invention, when a plurality of connecting portions of the core body and the split core are respectively formed asymmetrically, and when the connecting portions of the split cores are pressed into the connecting portions of the core body, By press-fitting so that each connecting portion of the split core is always located on a fixed side in the press-fit direction with respect to the core body, the arc shape of the cut surface of each laminated plate of the core body and the split core is Since the press-fitting can be performed such that the edges come in contact with each other first, there is no possibility that a gap is generated between the connecting portions. This is an excellent effect.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention.
FIG. 1 is a front view of a shaded coil type motor, FIG. 2 is a side view showing a press-fit direction of an iron core body and a split core of the motor, and FIG. 3 is a shaded coil type motor having a rotation direction opposite to that of FIG. FIG. 4 is a side view showing the press-fitting direction of the core body and the split core of the motor, FIG. 5 is a partially enlarged side view at the time of press-fitting the core body and the split core, and FIG. FIG. 7 is a front view of a conventional shaded coil type motor, and FIG. 7 is a view corresponding to FIG. 5 for explaining the same disadvantage. In the figure, 11 is a stator core, 12 is a core body, 13 is a split core,
14 is a shading coil, 18 is a projection, 19 is a coil, 20 is a bobbin, 23 and 24 are projections (connections), and 25 and 26 are recesses (connections).

Claims (1)

(57) [Claims] 1. A single metal plate material is cut by a punch and a die to form a pair of laminated plates each having a plurality of connecting portions. A motor that forms the split core, mounts the coil on the split core, and press-fits the connecting portion of the split core into the connecting portion of the core body by press-fitting, thereby manufacturing the split core and the core body integrally. Wherein the plurality of connecting portions of each of the pair of laminated plates are formed asymmetrically, and when the connecting portions of the divided cores are press-fitted into the connecting portions of the core bodies, Each connecting portion is press-fitted so that the arc-shaped edges of the cut surface formed by the punch and the die come into contact with each other such that the connecting portions are always positioned on a fixed side in the press-fitting direction with respect to the core body. A method for manufacturing a stator core for a motor, comprising: