JP5458082B2 - Manufacturing method of rotor laminated core - Google Patents

Description

The present invention relates to a method of inserting permanent magnets into a plurality of magnet insertion holes provided in an outer portion of a rotor laminated core, and further sealing and fixing the permanent magnets with resin.

For example, in the magnet-embedded rotor described in Patent Document 1, it is disclosed that a permanent magnet inserted into a magnet insertion hole is fixed by enclosing a resin in the magnet insertion hole. In Patent Document 1, a resin injection hole is further provided at a radially inner position of each magnet insertion hole, and the magnet insertion hole and the resin injection hole are communicated with each other through a communication groove, and the rotor laminated core is After pressing from above and below with the upper mold and the lower mold, the resin was injected from the resin injection hole with a predetermined pressure, and the permanent magnet in the magnet insertion hole was fixed.

JP 2002-34187 A

The present invention has been made in view of such circumstances, and in a rotor laminated iron core in which each core piece is laminated, a rotor laminated iron core capable of resin sealing a permanent magnet into a magnet insertion hole without resin leakage. An object is to provide a manufacturing method.

A method for manufacturing a rotor laminated core according to the present invention that meets the above-described object is to provide a permanent magnet to be inserted into a plurality of magnet insertion holes formed in an outer peripheral portion of a rotor laminated core in which a plurality of core pieces are laminated. A method for manufacturing a rotor laminated core that is injected and fixed in the magnet insertion hole,
A plurality of resin pots, which are formed so as to penetrate vertically above or below one of the rotor laminated iron cores and inject the resin into the magnet insertion hole, are radially inward of the magnet insertion hole in a plan view. Arrange the upper plate member and the lower plate member prepared in position ,
The rotor laminated core is pressed from above and below with the upper plate member and the lower plate member, and the resin in each resin pot is pushed out by a plunger to fill the magnet insertion hole.

The method for manufacturing a rotor laminated core according to any one of claims 1 to 4, further comprising an upper plate member and a lower plate member that substantially close the magnet insertion hole above and below the rotor lamination core when resin is injected into the magnet insertion hole. Since the resin injected into the resin pot is pushed by the plunger and filled into the magnet insertion hole, the permanent magnet can be fixed to the magnet insertion hole.

It is a partially cutaway front view of the apparatus which performs the manufacturing method of the rotor lamination | stacking iron core which concerns on one embodiment of this invention. It is a top view of a rotor lamination | stacking iron core. It is a detailed front view of the apparatus which performs the manufacturing method of the same rotor lamination | stacking iron core corresponding to the AA 'arrow in FIG.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1 to FIG. 3, a rotor laminated core manufacturing apparatus 10 used in an embodiment of the present invention is arranged at the upper and lower ends of four guide posts 11 that are vertically erected. Arranged between the fixed base 12 and the lower fixed base 13 and the upper fixed base 12 and the lower fixed base 13 and fixed to the elevator base 14 that moves up and down along the guide post 11, and the upper fixing member 12 and the elevator base 14, respectively. The upper plate member 15 and the lower plate member 16 are provided.
The upper plate member 15 includes a backing plate 17, an upper mold plate 18 and an upper pressing plate 19, and the lower plate member 16 is a lower mold plate 20 mounted on the lifting platform 14 and a lower pressing plate mounted thereon. 21. At the center of the lower pressing plate 21, there is a guide core 24 attached to a shaft hole 23 formed at the center of the rotor laminated core 22. In this embodiment, the lower pressing plate 21 and the guide core 24 form a tray that conveys the rotor laminated core 22 in a mounted state.

A hydraulic cylinder 25, which is an example of an elevating means, is provided on the upper portion of the lower fixed base 13, and the upper elevating base 14 moves up and down along the guide posts 11 by the hydraulic cylinder 25. Note that an air cylinder, a jack mechanism using a combination of a female screw and a male screw, an electric cylinder, a toggle mechanism, and the like can also be used as the lifting means.
An opening 28 is provided in the center of the backing plate 17, and the upper mold plate 18 and the upper pressing plate 19 corresponding to the opening 28 are in a state in which a plurality (8 in this embodiment) of resin pots (cylinders) 29 pass therethrough. It is formed with. As shown in FIG. 2, the resin pot 29 is located inside the eight magnet insertion holes 30 formed in the outer peripheral portion of the rotor laminated core 22 in plan view. Plungers 32 for pushing out the resin in the respective resin pots 29 are fixed to a common base 33, and the common base 33 is moved up and down by a hydraulic cylinder 34 fixed to the upper fixing base 12, and the resin put into the resin pot 29 is bottomed. It is trying to discharge from. The upper mold plate 18 is provided with an electric heater (not shown) which is an example of a first heat source (heating source), and heats the resin pot 29 to a temperature around 170 ° C.

As shown in FIG. 2 (only showing a planar position) and FIG. 3, a resin groove (runner) 35 serving as a resin passage between the resin discharge port of the resin pot 29 and the magnet insertion hole 30 is provided at the bottom of the resin pot 29. Is formed. The resin groove 35 is formed in the upper pressing plate 19 (that is, the bottom portion of the upper plate member 15) that contacts the rotor laminated core 22. On the other hand, a lower pressing plate 21 constituting the lower plate member 16 is disposed at the bottom of the rotor laminated iron core 22 to prevent resin leakage from the magnet insertion hole 30. The lower pressing plate 21 is provided with a vent (not shown) that allows air from the magnet insertion hole 30 to escape when the resin is sealed. The vent is formed of a groove having a depth of about 0.03 mm, which allows air to escape but does not allow resin to pass therethrough. The vent can be formed on the upper pressing plate 19. The lower mold plate 20 constituting the lower plate member 16 is provided with an electric heater as an example of a second heat source (heating source) to heat the lower mold plate 20 to about 170 ° C. Accordingly, the resin discharged from the resin pot 29 passes through the resin groove 35, enters the magnet insertion hole 30, covers the periphery of the permanent magnet 37 disposed inside, and each permanent magnet 37 is placed in the magnet insertion hole 30. Secure to.

The rotor laminated iron core 22 is formed by caulking and laminating a plurality of iron core pieces 39 formed by a plurality of press workings. When the iron core pieces 39 are formed, a caulking portion (in this embodiment, a V-shaped caulking) is used. 40 and 41 are formed. In the rotor laminated core 22 shown in FIG. 3, the uppermost iron core piece 39a is formed with a hole 42 through which the caulking portions 40, 41 of the lower iron core piece 39 project, respectively. The caulking portions 40 and 41 (in detail, caulking protrusions) of the lower iron core piece 39 protrude in a slight range from 42.

When the lower surface of the upper pressing plate 19 that is a part of the upper plate member 15 that presses the upper surface of the rotor laminated iron core 22 is a perfect plane, the caulking portions 40 and 41 protruding from the iron core piece 39a are pressed. In the bottom surface of the upper pressing plate 19, escape spaces 43 and 44 are formed at positions where the caulking portions 40 and 41 protrude so that the upper pressing plate 19 does not press the protruding caulking portions 40 and 41. This escape space is formed in the lower pressing plate 21 when the caulking portion of the rotor laminated core 22 protrudes from the lower surface of the rotor laminated core 22. Accordingly, the upper plate member 15 (specifically, the upper pressing plate 19) and the lower plate member 16 (specifically, the lower pressing plate 21) can be brought into close contact with the upper surface and the lower surface of the rotor laminated core 22, The upper plate member 15 and the lower plate member 16 can be reliably closed in the magnet insertion hole 30 formed in the rotor laminated iron core 22 to prevent resin leakage, and further, the caulking direction of the protruding caulking portions 40 and 41 can be Since no reverse load is applied, the caulking strength of the rotor laminated core 22 can be maintained.

Then, operation | movement of this manufacturing apparatus 10 of a laminated iron core and its effect | action are demonstrated.
In a state where the upper plate member 15 and the lower plate member 16 are respectively heated by an electric heater, the hydraulic cylinder 25 is operated to lower the elevator 14 and the hydraulic cylinder 34 is operated to raise the plunger 32. The rotor laminated core 22 mounted on the lower pressing plate 21 is disposed at a predetermined position (for example, via a positioning pin) of the lower mold plate 20. Here, it is preferable that the rotor laminated core 22 is preheated in the vicinity of 150 to 170 ° C. in advance. The lower pressing plate 21 and the guide core 24 constitute a transfer tray for the rotor laminated core 22.

Next, the hydraulic cylinder 25 is raised, the lower plate member 16 is pushed up, and the rotor laminated core 22 is pressed and clamped between the upper plate member 15 and the lower plate member 16. At this time, the caulking portions 40 and 41 protruding from the surface of the rotor laminated iron core 22 completely enter into the escape spaces 43 and 44 formed in the upper plate member 15, and the upper pressing plate 19 of the upper plate member 15 is moved to the rotor. It adheres to the upper surface of the laminated iron core 22. And, in a state where the rotor laminated iron core 22 is clamped by the upper pressing plate 19, a tablet of a predetermined thermosetting resin is put in each resin pot 29. Is dissolved. Next, the hydraulic cylinder 34 is lowered, the plunger 32 is pushed down, and the resin in the resin pot 29 is injected into the magnet insertion hole 30 through the resin groove 35. It should be noted that either the resin pot 29 or the plunger 32 may be provided with a vent (not shown) for releasing the air accumulated in the resin pot 29 when the plunger 32 is lowered.
As a result, the resin is sealed in the magnet insertion hole 30 and the permanent magnet 37 disposed inside is fixed. Although not shown, the permanent magnet 37 has a plurality of protrusions around it so as to be fixed at a predetermined position in the magnet insertion hole 30.

In the embodiment described above, the planar positions of the magnet insertion hole 30 and the resin pot 29 are completely different from each other and are connected by the resin groove 35. However, a part of the resin pot is part of the magnet insertion hole. It is also possible to omit the resin groove.
In the above-described embodiment, the resin pot 29 is disposed on the upper plate member 15. However, the resin pot 29 may be disposed on the lower plate member 16, or the rotor laminated core 22 may be turned upside down with the tray.
In the above embodiment, a thermosetting resin is used as the sealing resin, but a thermoplastic resin may be used.
Further, a cull (resin reservoir) for connecting a part or all of each resin pot 29 or each resin groove 35 may be provided.
Furthermore, the present invention is not limited by the shape of the escape spaces 43 and 44 as long as the caulking portion protruding from the surface of the rotor laminated core 22 can be fitted.

10: Manufacturing apparatus for rotor laminated core, 11: Guide post, 12: Upper fixing base, 13: Lower fixing base, 14: Lifting base, 15: Upper plate member, 16: Lower plate member, 17: Backing plate, 18 : Upper mold plate, 19: upper pressing plate, 20: lower mold plate, 21: lower pressing plate, 22: rotor laminated core, 23: shaft hole, 24: guide core, 25: hydraulic cylinder, 28: opening, 29: Resin pot, 30: Magnet insertion hole, 32: Plunger, 33: Common base, 34: Hydraulic cylinder, 35: Resin groove, 37: Permanent magnet, 39, 39a: Iron core piece, 40, 41: Caulking part, 42 : Hole, 43, 44: Escape space

Claims (4)

A method for manufacturing a rotor laminated core, in which a permanent magnet to be inserted into a plurality of magnet insertion holes formed on the outer peripheral portion of a rotor laminated core in which a plurality of iron core pieces are laminated is injected and fixed into the magnet insertion hole Because
A plurality of resin pots, which are formed so as to penetrate vertically above or below one of the rotor laminated iron cores and inject the resin into the magnet insertion hole, are radially inward of the magnet insertion hole in a plan view. Arrange the upper plate member and the lower plate member prepared in position ,
The rotation is characterized in that the rotor laminated iron core is pressed from above and below by the upper plate member and the lower plate member, the resin in each resin pot is pushed out by a plunger, and the magnet insertion hole is filled. Method for manufacturing a child laminated core. 2. The method of manufacturing a rotor laminated core according to claim 1, wherein the plurality of core pieces are caulked and the upper plate member or the lower plate member on the side where the caulking portion protruding from the surface of the rotor laminated iron core abuts. A method for manufacturing a rotor laminated iron core , wherein a clearance space for the caulking portion is formed in the rotor. 2. The method for manufacturing a rotor laminated core according to claim 1, wherein the magnet insertion hole and the resin pot are connected by a resin groove. 2. The method for manufacturing a rotor laminated core according to claim 1, wherein a part of the resin pot is wrapped in the magnet insertion hole.

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