JP4688950B2 - Resin sealing method for rotor laminated core - Google Patents

Description

The present invention relates to a resin sealing method for a rotor laminated core in which a permanent magnet is inserted into a plurality of magnet insertion portions provided around a shaft hole and fixed by a resin member.

Conventionally, a rotor laminated core (also referred to as a rotor core) used in a motor is formed by laminating a plurality of core pieces and a plurality of magnet holes (also referred to as magnet insertion portions) formed around a central shaft hole (also referred to as a shaft hole). After the permanent magnet is inserted into the magnet hole, the magnet hole is filled with a resin member and fixed by a resin reservoir pot (also referred to as a resin reservoir) provided in the mold (for example, Patent Document 1). reference). The resin member is filled with, for example, a resin that connects the resin reservoir pot and the magnet hole from the resin reservoir pot of the mold to the magnet hole of the laminated iron core provided at a different position in plan view from the resin reservoir pot. This is done through the channel and gate.

JP 2002-34187 A

However, in the resin member filling method described above, resin members (also referred to as runners and culls) remain on the resin flow path portion and the gate portion on the surface of the rotor laminated core.
For this reason, after the resin member filling step, a step of removing the resin member remaining on the surface is required, which requires labor and time. Further, since it is necessary to prepare a dedicated device for removing the remaining resin member, it is not economical because the manufacturing cost of the rotor laminated core cannot be reduced.

The present invention has been made in view of such circumstances, and eliminates the conventional resin member removal step, and also eliminates the need for a dedicated device for removal, and the rotor laminated core that can be manufactured economically with good workability. It aims at providing the resin sealing method.

The resin-sealing method of a rotor laminated core according to the present invention that meets the above-described object is a method of laminating a plurality of core pieces and forming each magnet of an iron core body having a plurality of magnet insertion portions around a central shaft hole. After the permanent magnet is inserted into the insertion portion, the magnet body is inserted from the resin reservoir provided in one of the upper die and the lower die while the iron core body is sandwiched between the upper die and the lower die. In the resin sealing method of the rotor laminated iron core in which the insertion portion is filled with a resin member and the permanent magnet is fixed,
The magnet in which the resin reservoir portion and the magnet insertion portion are communicated with the surface of the iron core main body via a resin flow path, and a resin injection hole set smaller than the magnet insertion portion is formed in the iron core main body. A dummy plate formed in a region overlapping with the insertion portion in plan view and on the radially inner side in the overlapping region is disposed, and 1 from the resin reservoir portion through the resin injection hole of the dummy plate. Alternatively, after the resin member is injected into a plurality of the magnet insertion portions and cured, the dummy plate is removed from the core body.

In the resin-sealing method for a rotor laminated core according to the present invention, it is preferable that the dummy plate is coupled to the core body in the manufacturing process of the core body.

In the resin sealing method for a rotor laminated core according to the present invention, the dummy plate is disposed in the core body after being manufactured and before being sandwiched between the upper mold and the lower mold. Is preferred.

In the resin-sealing method for a rotor laminated core according to the present invention, it is preferable that the dummy plate is made of the same metal material as the core piece.
In the resin sealing method for a rotor laminated core according to the present invention, it is preferable that the dummy plate is made of a metal material different from the core piece.

In the resin sealing method for a rotor laminated core according to the present invention, the thickness of the dummy plate is preferably larger than the thickness of the core piece.

The resin-sealing method of a rotor laminated iron core according to claim 1, wherein a dummy plate having a resin injection hole is disposed on the surface of the core body, and a magnet is inserted from the resin reservoir through the resin injection hole. Since the resin member is injected into the portion and cured, for example, an unnecessary resin member such as a cal or a runner can be adhered to the surface of the dummy plate and left. Thus, by removing the dummy plate, unnecessary resin members can be removed from the core body together with the dummy plate, eliminating the need for the conventional resin member removal process and eliminating the need for a dedicated removal device. A rotor laminated iron core can be manufactured well and economically.

And since the resin injection hole is formed smaller than the magnet insertion part in the area | region which overlaps with a magnet insertion part by planar view, the area | region which can arrange | position a resin reservoir part can be enlarged. As a result, the degree of freedom of the arrangement position of the resin reservoir with respect to the dummy plate can be improved. For example, a suitable resin flow path that does not adversely affect the fluidity of the resin member and does not create an unnecessary resin member residue. Pattern formation is possible.

Further, it is possible to form a pattern in which a resin member is simultaneously injected from a single resin reservoir to a plurality of magnet insertion portions, and the resin member can be efficiently injected into the magnet insertion portions.

In the resin sealing method of the rotor laminated core according to claim 2, the dummy plate and the core piece can be integrally manufactured with the same punching die by coupling the dummy plate to the core body in the manufacturing process of the core body. Therefore, it is excellent in productivity. Further, when the iron core body is transported, the dummy plate is difficult to be detached from the iron core body, and the handling becomes easy.
According to a third aspect of the present invention, there is provided a resin sealing method for a rotor laminated core, wherein the dummy plate is disposed on the core body after the core body is manufactured and before being sandwiched between the upper mold and the lower mold. The core body is not joined, and the dummy plate can be easily removed from the core body.

The resin-sealing method of the rotor laminated core according to claim 4 is excellent in productivity because the dummy plate and the core piece can be manufactured from the same metal material and can be manufactured integrally by the same punching die. .
According to a fifth aspect of the present invention, there is provided a resin sealing method for a rotor laminated iron core, wherein the dummy plate is made of a metal material different from the iron core piece. By removing the resin member remaining on the plate surface, the dummy plate can be used repeatedly, and resource saving can be achieved.
In addition, the dummy plate can be made of an inexpensive metal material or a metal material reusing scrap, and in this case, it is possible to save resources and reduce manufacturing costs.

In the resin-sealing method of the rotor laminated core according to claim 6, since the thickness of the dummy plate is thicker than the thickness of the core piece, the strength of the dummy plate can be improved, and the workability at the time of peeling off the adhered resin member is improved. In addition to improvement, it has excellent durability and can be used repeatedly for a long time.

(A), (B) is the partial sectional side view of the rotor lamination | stacking iron core manufactured with the manufacturing method of the rotor lamination | stacking iron core which concerns on one embodiment of this invention, respectively, and the dummy board mounted in the same rotor lamination | stacking iron core It is a partial top view. It is a fragmentary top view of the other dummy board mounted in the same rotor lamination | stacking iron core. It is explanatory drawing of the use condition of a rotor lamination | stacking iron core.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 (A) and 1 (B), the resin sealing method for a rotor laminated core according to an embodiment of the present invention is formed by laminating a plurality of core pieces 10 and having a central shaft hole 11. After the permanent magnet 14 is inserted into each magnet insertion hole 12 of the iron core body 13 having a plurality of magnet insertion holes (an example of a magnet insertion portion) 12 around the upper core 15, the upper core 15 and the lower mold 16 (upper The resin member 18 is filled into the magnet insertion hole 12 from a resin reservoir pot (an example of a resin reservoir portion) 17 provided in the upper mold 15 in a state where the mold 15 and the lower mold 16 are collectively referred to as a mold). Thus, when the permanent magnet 14 is fixed, a rotor laminated core (hereinafter simply referred to as a laminated core) 20 is manufactured using a dummy plate 19. This will be described in detail below.

First, an electromagnetic steel sheet (not shown) having a thickness of, for example, about 0.5 mm or less is punched in an annular shape, and the core body 13 is formed by sequentially stacking the punched core pieces 10. As a method of laminating the plurality of iron core pieces 10, any one or two or more of caulking, welding, and adhesion can be used in combination, but they may be simply stacked.
Thereby, a plurality of magnet insertion holes 12 penetrating in the vertical direction are formed around the shaft hole 11 of the core body 13. The arrangement position and shape of the magnet insertion hole are not limited to this, and may be a conventionally known arrangement position or shape, for example.
In this manner, the dummy plate 19 is disposed on the surface of the iron core body 13 (the surface on the side where the resin member 18 is injected and located on the upper mold 15 side). The dummy plate 19 is coupled to the uppermost core piece 10 of the core body 13 by, for example, caulking in the manufacturing process of the core body 13. After the core body 13 is manufactured, the upper mold 15 and the lower mold 16 are combined. Before being sandwiched between the two, the core piece 10 may be simply stacked and placed on the surface of the core piece 10 without being connected to the core piece 10.

The dummy plate 19 is punched from a magnetic steel sheet, which is the same metal material as the core piece 10, by using a mold (not shown) for punching the core piece 10, arranged on the surface of the core body 13, and caulked. . The dummy plate may be punched with a mold different from the mold for punching the core piece 10 and placed on the surface of the core body 13 before the resin member 18 is injected into the magnet insertion hole 12. In this case, the dummy plate may be made of the same metal material as the iron core piece 10 or may be made of a metal material different from the iron core piece 10.
Here, when the dummy plate is made of a metal material different from the iron core piece, for example, stainless steel, steel, or aluminum alloy, a coating that improves the releasability on one side of the dummy plate, that is, the contact surface with the iron core piece 10. A material (eg, lubricating oil) is coated. Moreover, the strength can be improved by making the thickness of the dummy plate thicker than the thickness of the iron core piece (for example, about 1.2 to 2 times that of the iron core piece).

As shown in FIGS. 1A and 1B, the dummy plate 19 has a resin reservoir pot 17 and a magnet insertion hole 12 in a region overlapping the magnet insertion hole 12 formed in the iron core body 13 in plan view. And a resin injection hole 21 for injecting the liquid resin member 18 is formed.
The resin injection hole 21 is smaller than the area of the plane cross section of the magnet insertion hole 12 and is formed on the radially inner side in a region overlapping the magnet insertion hole 12. For example, the permanent magnet 14 inserted into the magnet insertion hole 12 is used. Depending on the position of the resin reservoir 17 or the position of the resin reservoir pot 17, it may be disposed radially outward or in the center. The shape of the resin injection hole 21 is rectangular in plan view. However, depending on the shape of the magnet insertion hole 12 or the flow characteristics of the resin member 18 to be filled, for example, a square, a circle, an ellipse, or It is preferable to select a polygon or the like as appropriate.

The size of the resin injection hole 21 is preferably as large as possible so that the area of the resin injection hole 21 overlapping the magnet insertion hole 12 in plan view can be stably filled while maintaining the fluidity of the resin member 18.
Here, since the size of the resin injection hole 21 is set smaller than the cross-sectional area of the permanent magnet 14, when the laminated core 20 is manufactured, after the permanent magnet 14 is inserted into the magnet insertion hole 12 of the core body 13. A dummy plate 19 having a resin injection hole 21 is disposed on the uppermost part of the iron core body 13, or the end surface side opposite to the dummy plate 19 (side contacting the lower mold 16 of the iron core body 13). Therefore, the permanent magnet 14 may be inserted into the magnet insertion hole 12.
The resin injection hole may have the same shape as the magnet insertion hole 12 formed in the iron core body 13 in plan view, and the permanent magnet 14 may be inserted into the magnet insertion hole 12 through the resin injection hole. it can.

As described above, since the magnet insertion hole 12 is not formed in the dummy plate 19 in contact with the upper die 15, the contact area between the upper die 15 and the dummy plate 19 is set to the iron core body 13 in which the magnet insertion hole 12 is formed. Can be made wider than in the case of directly contacting the upper die 15. As a result, a region where the resin member 18 in the resin reservoir pot 17 can come into contact with the dummy plate 19 in contact with the upper mold 15, and further, the resin reservoir pot 17 formed in the upper mold 15 and the resin injection hole 21 communicate with each other. An area where the resin member 18 in the resin flow path 22 that can be contacted is secured. Therefore, the degree of freedom of the formation position of the resin reservoir pot 17 provided in the upper mold 15 is increased.
The resin reservoir pot 17 may be disposed at a position overlapping the resin injection hole 21 provided in the dummy plate 19 in contact with the upper mold 15 in plan view. In this case, it is not necessary to provide a resin flow path in the upper mold.

Then, the iron core body 13 on which the dummy plate 19 is disposed is tilted, and the permanent magnets 14 are inserted into the respective magnet insertion holes 12 from the end surface side opposite to the dummy plate 19. Next, the iron core body 13 is preheated in a state of being sandwiched between the upper mold 15 and the lower mold 16 of the resin sealing device 23, and from the resin reservoir pot 17 provided in the upper mold 15 to each magnet insertion hole 12. The liquid resin member 18 is filled, the resin member 18 is cured, and the permanent magnet 14 is fixed in the magnet insertion hole 12.
In addition, as a resin member, the thermosetting resin like the epoxy resin currently used for manufacture of the semiconductor device can be used, for example. Further, before the core body 13 is sandwiched between the upper mold 15 and the lower mold 16 of the resin sealing device 23, it is preferable to preheat with the preheating device in advance.

As shown in FIGS. 1A and 1B, the upper mold 15 of the resin sealing device 23 is provided with a resin reservoir pot 17 that heats the raw material (pellet shape) of the resin member 18 to make it liquid. 19 is provided in a state of extending to the end of the upper mold 15 that contacts the 19.
The resin sealing device 23 is provided with a plunger 24 that can be moved up and down in the resin reservoir pot 17. The liquid resin member 18 pushed out from the resin reservoir pot 17 by the plunger 24 communicates with the downstream end portion of the resin reservoir pot 17, and between the lower surface of the upper mold 15 and the upper surface of the dummy plate 19. After passing through the formed resin flow path 22, the magnet insertion hole 12 is finally filled through the resin injection hole 21. And the permanent magnet 14 inserted in the magnet insertion hole 12 can be fixed with the resin member 18 by heating and hardening the resin member 18 with which the magnet insertion hole 12 was filled.

It is also possible to use a resin sealing device having an upper mold and a lower mold, and having a resin reservoir pot in which the raw material (pellet shape) of the resin member is heated to be liquefied.
In this case, since the dummy plate 19 in which the resin injection hole 21 is formed is disposed on the lower end surface side of the core body 13, it comes into contact with the lower mold. Thereby, since the magnet insertion hole 12 formed in the iron core body 13 opens upward, the permanent magnet is inserted into each magnet insertion hole 12 from the iron core piece 10 side located on the end surface side opposite to the dummy plate 19. 14 can be inserted. The resin flow path formed between the upper surface of the lower mold and the lower surface of the dummy plate is communicated with the downstream end of the resin reservoir pot by the liquid resin member pushed out from the resin reservoir pot by the plunger. The magnet insertion holes 12 are finally filled through the resin injection holes 21.

As shown in FIGS. 1A and 1B, the resin reservoir pot 17 provided in the upper mold 15 can fill the resin member 18 from one resin reservoir pot 17 into one magnet insertion hole 12. A plurality of them are provided at equal intervals in the circumferential direction. As a result, the resin reservoir pot 17 communicates with the magnet insertion hole 12 via the resin flow path 22 provided at the bottom of the upper die 15 and the resin injection hole 21 of the dummy plate 19. The resin member 18 can be supplied.
Depending on the shape of the laminated iron core, the resin member 18 may be inserted from a single resin reservoir pot 17 into a plurality of (for example, two or three) magnet insertion holes 12 via a plurality of resin flow paths and resin injection holes. It can also be injected.
Here, the resin reservoir pot 17 is provided on the inner side in the radial direction of the core body 13 in plan view, but may be provided on the outer side in the radial direction.

As described above, after the resin member 18 is injected into the magnet insertion hole 12 through the resin injection holes 21 of the dummy plate 19 and cured, the dummy plate 19 is removed from the core body 13.
When removing the dummy plate 19, it may be peeled off by using a machine, but it may be peeled off only by an operator's manual work without requiring a special process and equipment. In this case, as shown in FIG. 2, by using one (or a plurality of) grips 25 provided on the outer side in the radial direction of the dummy plate 19a, workability of the dummy plate 19a can be removed. Can be further improved.
By removing the dummy plate 19, excess resin 26 (for example, runners and culls) remaining on the surface of the dummy plate 19 can be removed from the core body 13 together with the dummy plate 19.

In addition, it is preferable to coat | cover the coating material (for example, lubricating oil) which makes peeling property favorable on the one surface of the dummy plate 19, ie, the contact surface with the upper mold | type 15. Thereby, the excess resin 26 can be easily peeled off from the dummy plate 19, and the dummy plate 19 can be used repeatedly. Here, the coating material for improving the peelability may be coated on both surfaces of the dummy plate 19.
Although most of the surplus resin 26 is removed from the laminated core 20 manufactured by the above method, the surplus resin 27 remains in a portion corresponding to the resin injection hole 21 of the dummy plate 19. However, in use, the laminated core 20 is sandwiched between the end plates 28 and 29 from both sides in the thickness direction of the laminated core 20 (in the lamination direction of the core pieces 10), as shown in FIG. By forming the groove portion 30 that allows the excess resin 27 to escape, there is no problem due to the surplus resin 27 remaining. Since the surplus resin 27 is slight, it may be removed in advance before being sandwiched between the end plates 28 and 29.
In this way, by applying the present invention, the conventional process of removing the resin member from the surface of the rotor laminated iron core is unnecessary, and a dedicated apparatus for the removal is also unnecessary, which is economically manufactured with good workability. it can.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the resin sealing method for a rotor laminated core of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the thermosetting resin was used as a resin member, a thermoplastic resin can also be used.
And in the said embodiment, although the dummy plate was demonstrated using the metal mold | die which punches an iron core piece, and the case where it arrange | positioned on the surface of an iron core main body was demonstrated, a dummy plate can be raised / lowered with respect to an upper mold | type. It can be provided and used repeatedly.

10: Iron core piece, 11: Shaft hole, 12: Magnet insertion hole (magnet insertion portion), 13: Iron core body, 14: Permanent magnet, 15: Upper die, 16: Lower die, 17: Resin reservoir pot (resin reservoir portion) ), 18: resin member, 19, 19a: dummy plate, 20: rotor laminated core, 21: resin injection hole, 22: resin flow path, 23: resin sealing device, 24: plunger, 25: gripping portion, 26 27: Surplus resin, 28, 29: End plate, 30: Groove

Claims (6)

After a permanent magnet is inserted into each of the magnet cores of the core body formed by laminating a plurality of core pieces and having a plurality of magnet insertion parts around the central shaft hole, the core body is divided into an upper mold and a lower mold. A rotor laminated iron core in which the permanent magnet is fixed by filling the magnet insertion portion with a resin member from a resin reservoir provided in any one of the upper die and the lower die while being sandwiched between In the resin sealing method,
The magnet in which the resin reservoir portion and the magnet insertion portion are communicated with the surface of the iron core main body via a resin flow path, and a resin injection hole set smaller than the magnet insertion portion is formed in the iron core main body. A dummy plate formed in a region overlapping with the insertion portion in plan view and on the radially inner side in the overlapping region is disposed, and 1 from the resin reservoir portion through the resin injection hole of the dummy plate. Alternatively, after the resin member is injected into a plurality of the magnet insertion portions and cured, the dummy plate is removed from the iron core body. 2. The resin-sealing method for a rotor laminated core according to claim 1, wherein the dummy plate is joined to the core body in the manufacturing process of the core body. . 2. The resin-sealing method for a rotor laminated core according to claim 1, wherein the dummy plate is disposed in the core body after being manufactured and before being sandwiched between the upper mold and the lower mold. A resin sealing method for a rotor laminated iron core, characterized in that: 4. The method of encapsulating a rotor laminated core according to claim 1, wherein the dummy plate is made of the same metal material as the iron core piece. 5. Resin sealing method. 4. The resin-sealing method for a rotor laminated core according to claim 1, wherein the dummy plate is made of a metal material different from that of the core piece. 6. The resin sealing method for a rotor laminated core according to claim 5, wherein the thickness of the dummy plate is thicker than the thickness of the core piece.

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