JP2002361678A - Rotor manufacturing method and forming apparatus - Google Patents

Abstract

(57) [Problem] To provide a method of manufacturing a rotor capable of reducing the manufacturing cost. Each magnet is molded and fixed while being pressed by an injection pressure of a resin molding material so as to be in close contact with each outer surface of a spacer during molding. In each of the resin injection ports 22h and 23h, the injection direction of the resin molding material M injected from each of the resin injection ports 22h and 23h is oblique to the axial direction of the rotor shaft 11, and the recess 22a and 23a side opening is respectively Magnet 1
3 is provided on the lower mold 22 and the upper mold 23 so as to face the radial outer surface 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotor of an electric motor and a molding apparatus.

[0002]

2. Description of the Related Art In a rotating magnetic field type motor using a permanent magnet for a rotor, a permanent magnet is provided on the surface of the rotor. In most cases, permanent magnets are firmly bonded and fixed to the rotor surface with an adhesive, but if the number of permanent magnet poles becomes large, the number of man-hours required for the bonding is increased. Increases, which causes an increase in cost.

In view of this, there have been proposed many techniques for fixing a permanent magnet to a rotor with a resin (for example, Japanese Utility Model Laid-Open No. 3-70036). FIG. 15 is a fragmentary cross-sectional view showing a method for manufacturing a conventional motor rotor. The rotor is provided with a plurality of permanent magnets 52 on the outer periphery of the spacer 51,
These magnets 52 are made of a resin
The spacer 51 and the magnet 52 are integrally formed by being brought into close contact with the outer periphery of the magnet 1.

[0004] At the time of molding, the magnet 52 is temporarily fixed to the outer periphery of the spacer 51, and the integrated rotor coarse material 50 a is placed in the molding die 60. Then, the resin molding material 53 is injected (injected) into a space (cavity) formed between the rough material 50a and the mold 60.
By hardening, the magnet 52 is molded integrally with the spacer 51. The magnet 52 is temporarily fixed on the outer periphery of the spacer 51 by lightly using, for example, an adhesive or the like to such an extent that the magnet 52 does not come off the radial outer surface of the spacer 51 when the rough material 50a is placed on the molding die 60. It is designed to be fixed.

[0005]

In order to prevent the magnet 52 from being displaced from the surface of the spacer 51 by the injection pressure (injection pressure) of the resin molding material 53 during the molding process, the magnet 52 is mounted on the mold 60. The axial ends (only the left end of one end is shown in FIG. 15) of the magnet 52 are held by the jig pins 61 provided. At the time of the molding, the injection pressure of the resin molding material 53 causes the magnet 5 to move.
In order to prevent the 2 from rising from the radial outer surface of the spacer 51, the magnet 52 is pressed by a jig pin 62 provided on the mold 60 so that the magnet 52 is always in close contact with the radial outer surface of the spacer 51. Was.

As a result, the jig pins 61 and 62 are
Since it is necessary to provide each magnet 52, the structure of the molding die 60 becomes complicated, which is a problem in reducing the manufacturing cost. Further, since it is necessary to strongly press the magnet 52 with the jig pin 62 by preventing the mold resin 54 from entering between the magnet 52 and the spacer 51 during molding, the pressing of the jig pin 62 against the magnet 52 is required. There is also a problem that it is difficult to control the pressure load.

[0007] A first object of the present invention is to provide a method for manufacturing a rotor which can reduce the manufacturing cost. A second object of the present invention is to provide a rotor forming apparatus that can be configured with a simple structure.

[0008]

According to a first aspect of the present invention, there is provided a rotary shaft, a spacer integrally rotating with the rotary shaft, and a spacer provided on a radial outer surface of the spacer. A plurality of magnets provided, a method for manufacturing a rotor in which each of the magnets is molded and fixed to a radially outer surface of the spacer with a resin molding material, wherein each of the magnets is formed by injection pressure of the resin molding material. The gist is that the spacer is pressed against the outer surface in the radial direction.

According to a second aspect of the present invention, in the method of manufacturing a rotor according to the first aspect, each of the magnets is pressed in both a radial direction and an axial direction of the spacer by an injection pressure of the resin molding material. Is the gist.

According to a third aspect of the present invention, there is provided a rotary shaft, a spacer integrally rotating with the rotary shaft, and a plurality of magnets molded and fixed to a radially outer surface of the spacer with a resin mold material. In the method of manufacturing a rotor, the gist is that the magnets are temporarily fixed in advance to a radially outer surface of the spacer with a magnet holder and then fixed with the resin mold material.

According to a fourth aspect of the present invention, in the method of manufacturing a rotor according to the third aspect, the magnet holder is formed of the same material as the resin molding material. The invention according to claim 5 is capable of opening and closing a rotor coarse material including a rotating shaft, a spacer that rotates integrally with the rotating shaft, and a plurality of magnets provided on a radially outer surface of the spacer. A rotor that is disposed in a cavity formed in a pair of molds, injects a resin molding material from a gate provided in the mold, and mold-fixes each magnet to a radially outer surface of a spacer with the resin molding material. Wherein the gate is provided at a predetermined position of the mold so that the resin molding material presses each magnet against a radially outer surface of the spacer.

According to a sixth aspect of the present invention, in the apparatus for molding a rotor according to the fifth aspect, in the gate, the resin mold material presses the magnets in both the radial direction and the axial direction of the spacer. The gist is that the metal mold is provided at a predetermined position of the mold.

According to the first and fifth aspects of the present invention, each magnet is molded and fixed in a state where the magnet is pressed by the injection pressure of the resin molding material so as to be in close contact with the radial outer surface of the spacer during molding. I was doing it. Therefore,
Each magnet does not float from the radial outer surface of the spacer due to the injection pressure of the resin molding material.

According to the invention described in claim 2, according to claim 1,
In addition to the operation of the invention described in the above, each magnet is pressed in both the radial direction and the axial direction by the injection pressure of the resin molding material. According to the third aspect of the present invention, each magnet can be temporarily fixed to the spacer with high positional accuracy, and a positioning pin for positioning each magnet is omitted.

According to the invention described in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), at the time of molding, the high-temperature resin mold material melts the magnet holder and the magnet holder and the resin mold material are integrally cured.

According to the invention described in claim 6, according to claim 5,
In addition to the effects of the invention described in (1), the resin molding material injected from one gate presses each magnet in both the radial direction and the axial direction.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a rotor of a rotating magnetic field type electric motor will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a rotor 10 of the present embodiment. FIG. 2 is a sectional view taken along line AA in FIG.

The rotor 10 of this embodiment includes a rotor shaft 11 as a rotating shaft, a spacer 12, a magnet 13, and a resin mold layer 14. The rotor shaft 11 is inserted and fitted into a through hole 12 a provided at the center of the spacer 12. That is, the rotor shaft 11 is integrated with the spacer 12.

The spacer 12 is made of metal, and its outer shape is formed in the shape of an equilateral polygon having the same number of sides as the number of magnetic poles of the electric motor. In this embodiment, the spacer 12 is formed in the shape of a dodecagon. The magnets 13 which are slightly shorter than the side length are provided on each outer surface 12b as a radial outer surface of the spacer 12. That is, 1 corresponds to each outer surface 12b.
Two magnets 13 are provided.

Each of the magnets 13 is a permanent magnet and is formed in a rectangular shape in a vertical section. That is, the spacer-side contact surface of each magnet 13 is flat. The spacer 12 and the plurality of magnets 13 are substantially covered with a resin mold layer 14.

Hereinafter, an apparatus for forming the rotor 10 will be described with reference to FIGS.
It will be described according to. FIG. 3 is a front view showing a forming device of the rotor 10. FIG. 4 is a sectional view taken along line BB in FIG. In the present embodiment, a resin mold layer 14 that covers the rotor coarse material 10a is formed by molding a rotor coarse material 10a in which the rotor shaft 11, the spacer 12, and the magnet 13 are integrally assembled. The method of assembling the rotor coarse member 10a is the same as that of the related art, and a description thereof is omitted.

In this embodiment, a molding die 21 as a molding device for molding the rotor 10 is a lower die (fixed die) 2 as a pair of dies that can be opened and closed in a vertical direction.
2 and an upper mold (movable mold) 23. In the present embodiment, the lower mold 22 and the upper mold 23 are formed symmetrically with substantially the same shape and dimensions. Therefore, the description of the configuration of the lower mold 22 and the upper mold 23 will be given simultaneously without going back and forth.

The lower mold 22 and the upper mold 23 are provided with a recess 22a and a recess 23a, respectively. The recess 2
2a and the concave portion 23a are each formed in a semi-cylindrical shape,
The inner dimensions of the cavity, which is a cylindrical space formed by combining the recesses 22a and 23a, are set to be the same as the outer dimensions of the resin mold layer 14 of the rotor 10.

The side walls 22b and 22c of the lower die 22 and the side walls 23b and 23c of the upper die 23 are provided with through recesses 22d and 22e and through recesses 23d and 23e, respectively. The through recesses 22d, 22e and the through recess 23d,
23e are each formed in a semicircle. And
The diameter of the circular hole formed by combining the through recesses 22d and 23d and the diameter of the circular hole formed by combining the through recesses 22e and 23e is the same as that of the rotor shaft 1.
1 is set to be almost the same as the diameter of the first.

The side walls 22b, 22 of the lower mold 22
c and side walls 23b, 23c of the upper die 23, a plurality of (six) positioning pin insertion holes 22f, 22g, respectively.
And positioning pin insertion holes 23f and 23g are provided. Each positioning pin insertion hole 22f, 22g, 23f, 2
3g are arranged on semicircles each having the same radius,
They are formed at equal angular intervals. The radius of the semicircle in which the positioning pin insertion holes 22f, 22g, 23f, and 23g are provided is set to be substantially the same as the radius of the circumference of the rotor coarse material 10a where the axial center of each magnet 13 is located. I have.
In other words, each positioning pin insertion hole 22f, 22g,
Reference numerals 23f and 23g denote side walls 22 of the lower die 22 corresponding to the positions of the respective magnets 13 of the rotor coarse material 10a.
b, 22c and side walls 23b, 23c of the upper die 23 are provided at predetermined positions.

Further, the side wall 22b of the lower die 22 and the side wall 23b of the upper die 23 have a plurality of (6
) Are provided with resin injection ports 22h and 23h as gates. Each resin injection port 22h, 23h is
Are provided at positions corresponding to the positioning pin insertion holes 22f, 23f provided on the side wall 22b of the upper die 23 and the side wall 23b of the upper die 23. As shown in FIGS. 4 and 6, each of the resin injection ports 22h and 23h penetrates the side wall 22b of the lower die 22 and the side wall 23b of the upper die 23, that is, communicates with the recesses 22a and 23a. It is formed as follows. Each of the resin injection ports 22h and 23h is formed in a tapered shape such that the cross-sectional area decreases from the outside of the side wall portions 22b and 23b toward the concave portions 22a and 23a.

At the time of molding, as shown in FIGS. 4 and 5, first, the rotor shaft 11 of the rotor coarse material 10 a is inserted into the through recesses 22 d and 2 of the lower mold 22.
The lower half of the spacer 12 to which the magnet 13 is temporarily fixed is accommodated in the recess 22a while being supported by 2e (only the through recess 22d is shown in FIG. 5). Next, the spacer 1
2 so that the upper half of the upper mold 2 is accommodated in the recess 23a.
3 is matched with the lower mold 22. At this time, rotor coarse material 1
In reference numeral 0a, each magnet 13 is accommodated in the molding die 21 corresponding to each of the positioning pin insertion holes 22f, 22g, 23f, 23g. As shown in FIG. 4, each of the magnets 13 has two positioning pin insertion holes 22f, 22g, and 23 at both ends in the axial direction of the rotor shaft 11.
The positioning pins 24 inserted through the f and 23g are in contact with each other. At this time, each of the resin injection ports 22h,
23h, the injection direction of the resin molding material M injected from each of the resin injection ports 22h and 23h is oblique to the axial direction of the rotor shaft 11, and the openings on the concave portions 22a and 23a sides are outside the radial direction of each magnet 13. It is formed so as to face the surface 13a.

Then, the resin molding material M is injected into the molding die 21 at a predetermined injection pressure through the respective resin injection ports 22h and 23h, and is cured to form the rotor coarse material 1.
The resin mold layer 14 is formed on the outer surface of Oa. At this time, the resin molding material M injected into the molding die 21 from each of the resin injection ports 22h and 23h faces the outer surface 13a of each magnet 13 in the radial direction of the spacer 12 (arrow C shown in FIG. 6). Direction). Each magnet 13 is attached to the rotor shaft 11 by a positioning pin 24.
Is restricted in the axial direction. Thus, during molding, each magnet 13 is pressed by the injection pressure of the resin molding material M so as to be in close contact with the outer surface 12 b of the spacer 12. Therefore, each magnet 13 does not rise from the outer surface 12b of the spacer 12, and each magnet 13 and the spacer 1
No resin enters between the two.

According to the present embodiment, the following features can be obtained. (1) Each magnet 13 is provided with a spacer 12 during molding.
The mold is fixed while being pressed by the injection pressure of the resin molding material M so as to be in close contact with each outer surface 12b.

Therefore, it is possible to prevent each magnet 13 from floating from each outer surface 12b of the spacer 12 due to the injection pressure of the resin molding material M. As a result, each of the magnets 13 is moved by the injection pressure of the resin molding material M into the outer surface 12 of the spacer 12.
The structure of the mold 21 is simpler than that of the prior art in which a jig pin for pressing each magnet 13 is provided in order to prevent the rotor 10 from being lifted from b, and the manufacturing cost of the rotor 10 can be reduced.

(2) Each resin injection port 22h, 23h is
The injection direction of the resin molding material M injected from each of the resin injection ports 22h and 23h is oblique to the axial direction of the rotor shaft 11, and the recess 22a and 23a side openings are respectively formed on the radial outer surface 13a of each magnet 13. The lower mold 22 and the upper mold 23 are provided to face each other. That is, each of the resin injection ports 22h and 23h of the molding die 21 is connected to the lower die 2 thereof.
The resin mold material M injected into the cavity formed when the upper mold 23 and the upper mold 23 are closed presses each magnet 13 of the rotor coarse material 10a disposed and accommodated in the cavity against each outer surface 12b of the spacer 12. It was provided at a predetermined position.

Accordingly, the lower mold 22 and the upper mold 23 are pressed against the respective magnets 13 by preventing the respective magnets 13 from floating from the respective outer side surfaces 12b of the spacer 12 due to the injection pressure of the resin molding material M during molding. There is no need to provide a jig pin for this. As a result, the structure of the molding die 21 is simplified by effectively utilizing the injection pressure of the resin molding material M, and the manufacturing cost of the rotor 10 can be reduced.

The present embodiment may be modified as follows. As shown in FIG. 7, a molding die 21 as a molding device for molding the rotor 10 is configured by a left die 25 and a right die 26 as a pair of dies that can be opened and closed in the horizontal direction. You may. More specifically, the left mold 25 and the right mold 26 are provided with cylindrical concave portions 25a and 26a, respectively, and the inner dimensions of the cylindrical space as a cavity formed by combining both concave portions 25a and 26a are the same as those of the rotor 10 described above.
Are set to be the same as the outer dimensions of the resin mold layer 14. Bottom portions 25b, 26 of both recesses 25a, 26a
At the center of b, through holes 25c and 26c are provided, respectively.

The bottom 25 of both recesses 25a, 26a
Each of b and 26b is provided with a plurality of (the same number as the magnets 13, that is, 12) cylindrical projections 25d and 26d. Each of the cylindrical projections 25d and 26d is disposed on a circumference having the same radius, and is formed at equal angular intervals. The radius of the circumference where the cylindrical projections 25d and 26d are disposed is set to be substantially the same as the radius of the circumference where the axial center of each magnet 13 in the rotor coarse material 10a is located.

Further, a plurality of (the same number as the magnets 13, ie, 12) resin injection ports 25e as gates are provided in the bottom 25b of the recess 25a. Each resin injection port 25e is formed to penetrate the bottom 25b of the recess 25a, that is, to communicate with the recess 25a. Also, each resin injection port 25e is provided at the bottom 25
It is formed in a tapered shape so that the cross-sectional area becomes smaller from the outside of b toward the concave portion 25a side.

At the time of molding, the rotor coarse material 10a is accommodated in the molding die 21 such that the axial center of each magnet 13 coincides with the axial center of each of the cylindrical projections 25d and 26d. Both ends of each magnet 13 are in contact with the cylindrical projections 25d and 26d. At this time, each of the resin injection ports 25e is connected to each of the resin injection ports 2e.
5e, the injection direction of the resin molding material M obliquely intersects with the axial direction of the rotor shaft 11, and the recess 2
5a side opening is the radial outer surface 13a of each magnet 13 respectively
It is formed so as to face.

Then, the resin molding material M is injected into the molding die 21 at a predetermined injection pressure through the respective resin injection ports 25e, and is cured to form the resin molding layer 14 on the outer surface of the rotor rough material 10a. Is done. At this time, the resin mold material M injected into the molding die 21 from each resin injection port 25e is injected so as to face the radial outer surface 13a of each magnet 13. Each magnet 13 is connected to the rotor shaft 1 by the cylindrical projections 25d and 26d.
1 is restricted from moving in the axial direction. Thereby, each magnet 13 is pressed by the injection pressure of the resin molding material M so as to be always in close contact with the outer surface 12 b of the spacer 12.

In this case, in addition to the effects described in the features of the above embodiment, each of the cylindrical projections 25d and 26d is formed integrally with the left and right dies 25 and 26, so that the number of parts of the molding die 21 is reduced. And the configuration is simplified.

○ As shown in FIG.
h, 23h (only the resin injection port 23h is shown in FIG. 8)
The lower molds 2 are so arranged that the injection direction (the direction of arrow D shown in FIG. 8) of the resin molding material M injected from the respective resin injection ports 22 h and 23 h substantially coincides with the radial direction of the spacer 12.
2 and the upper die 23. At this time, the resin injection ports 22h and 23h are provided substantially corresponding to the center positions of the magnets 13. In this case, substantially the same effects as those described in the features (1) and (2) of the above embodiment can be obtained.

The resin inlets 22h and 23h may be provided as shown in FIG. More specifically, each resin injection port 22
h, 23h (only the resin injection port 23h is shown in FIG. 9)
The injection direction (the direction of the arrow E) of the resin molding material M injected from each of the resin injection ports 22h and 23h is oblique to the axial direction of the rotor shaft 11, and the recesses 22a and 23 thereof.
The a-side opening is formed large so as to face the radial outer surface 13a and the axial one end surface (the left end surface in FIG. 9) 13b of each magnet 13, respectively. In this case, each magnet 1
3 is pressed by the injection pressure of the resin molding material M so as to be in close contact with the outer surface 12 b of the spacer 12. Each magnet 13 is positioned on the opposite side of the positioning pin 2 by the pressing force of the injection pressure of the resin molding material M in the axial direction of the rotor shaft 11.
4 and is positioned by being pressed.
Therefore, in addition to the effects described in the features (1) and (2) of the above-described embodiment, the positioning pin 24 and the positioning pin insertion holes 22f and 23f on the resin injection ports 22h and 23h can be omitted. The structure of the mold 21 is further simplified, and the number of parts and cost can be further reduced.

In this case, as shown in FIG. 10, one end of each magnet 13 on the side of the resin injection port 22h, 23h (FIG. 10).
In this case, the left end portion may be formed in an arc shape (large R cross-sectional shape or chamfered shape). Thereby, the resin injection port 2
The flow of the resin molding material M injected from 2h and 23h becomes smoother.

As shown in FIG. 11, a V-shaped notch 13c may be provided at one end (the left end in FIG. 10) of each magnet 13 facing the resin inlet. At this time, the resin molding material M injected from the resin inlets 22h and 23h is applied to the magnets 1 along the circumferential direction of the spacer 12 by the injection pressure acting on the V-shaped notch 13c.
3 can be prevented.

As shown in FIGS. 12 and 13, the rotor coarse material 10a may be formed by temporarily fixing each magnet 13 to the spacer 12 in advance by the magnet holder 30. The magnet holder 30 includes a plurality of magnets (the same number as the magnets 13;
Are provided with fitting protrusions 30a extending in the axial direction, and are formed of the same resin material as the resin molding material M for molding the rotor coarse material 10a. The spacer 12 is provided such that a fitting concave portion 12c for fitting the fitting convex portion 30a between both outer side surfaces 12b adjacent to each other extends in the axial direction of the spacer 12. Then, each fitting projection 30a of the magnet holder 30 holding the magnet 13 is fitted into the fitting recess 12c of the corresponding spacer 12, whereby
The magnet 13 is temporarily fixed to the spacer 12. At the time of molding, the magnet holder 30 is melted by the high-temperature resin mold material M, and the resin mold material M and the magnet holder 30 are integrally cured, whereby the resin mold layer 14 is formed.
According to this, each magnet 13 is positioned with high accuracy in the spacer 12.
At the same time, and each positioning pin insertion hole 22f, 22g, 23f,
23g and the positioning pin 24 can be omitted.
As a result, the structure of the molding die 21 is further simplified, and the number of parts can be further reduced.

Each of the fitting projections 30a may be formed so that its axial length is slightly shorter than the axial length of each of the recesses 12c. In this case, at the time of molding, the resin molding material M can easily enter the fitting concave portion 12c, and the magnet 13 can be fixed so as to be integrated with the spacer 12.

Further, the magnet holder 30 may be formed with a spring property. In this case, the elastic force of the magnet holder 30 acts as a preload that presses each magnet 13 toward the spacer 12. Therefore, when the magnet 13 is temporarily fixed to the spacer 12 by the magnet holder 30, the magnet 13 comes into close contact with the spacer 12 due to its spring property, so that the magnet 13 of the resin molding material M and the spacer 12
Intrusion (penetration) into the space can be prevented.

In the above embodiment, the outer shape of the spacer 12 is formed in the shape of a dodecagonal prism. It may be formed in a column shape, and may be formed in a polygonal column shape other than a dodecagon, for example, a pentagon, a hexagon, and an octagon. Further, as shown in FIG. 14, the spacer 12 may have a cylindrical outer shape, and each magnet 13 may have a fan-shaped vertical cross section. In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

In the above-described embodiment, each magnet 13 is formed in a rectangular shape in vertical section. However, if the contact surface of each magnet 13 on the spacer side is made flat, the vertical section can be formed in any shape. May be. In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

The resin inlets 22h and 23h and the resin inlet 25e may be formed in shapes other than the tapered shape. The resin injection ports 22h and 23h may be provided on the side walls 22c and 23c of the lower mold 22 and the upper mold 23, respectively.

○ Each positioning pin insertion hole 22f, 22g,
23f and 23g may be formed by through holes other than circular holes. In the above-described embodiment, the present invention is embodied in the rotor of the rotating magnetic field type motor. However, the present invention is not limited to the rotor of the rotating magnetic field type motor. You may. In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

Next, technical ideas that can be grasped from the above embodiment and other examples will be additionally described below. (1) The method for manufacturing a rotor according to claim 3 or 4, wherein the magnet holder (30) has a fitting projection (30a).
The spacer (12) is provided with a fitting recess (12).
c) is provided, and the plurality of magnets (13) are temporarily fixed to the spacer (12) by fitting the fitting protrusion (30a) and the fitting recess (12c). Manufacturing method.

(2) In the method of manufacturing a rotor according to (1), the axial length of the fitting concave portion (12c) is set to be longer than the axial length of the fitting convex portion (30a). A method for manufacturing a rotor, comprising:

(3) In the method of manufacturing a rotor according to the above (1) or (2), the magnet holder (30) has an elastic force for preloading each magnet (13) toward a spacer (12). A method for manufacturing a rotor, comprising:

(4) In the method of manufacturing a rotor according to claim 2, a V-shaped notch is formed at one end of each of the magnets (13) which receives the pressing force of the resin molding material (M) in the axial direction. (13c) A method for manufacturing a rotor, comprising:

[0054]

As described in detail above, claims 1, 2, and 5
According to the inventions described in (6) and (6), the structure of the rotor forming apparatus is simplified, and the manufacturing cost of the rotor can be reduced.

According to the third and fourth aspects of the invention, the structure of the rotor forming apparatus is further simplified, and the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a rotor according to an embodiment.

FIG. 2 is a sectional view of the rotor taken along the line AA in FIG. 2;

FIG. 3 is a front view showing a rotor molding apparatus.

4 is a view similar to FIG. 3 showing the rotor molding apparatus; FIG.
-B line sectional drawing.

FIG. 5 is an exploded front view showing the rotor molding apparatus.

FIG. 6 is an enlarged view of a main part of FIG. 4, which also shows a rotor forming apparatus.

FIG. 7 is a cross-sectional view illustrating another example of a rotor forming apparatus.

FIG. 8 is a cross-sectional enlarged view of a main part showing another example of a rotor forming apparatus.

FIG. 9 is an enlarged cross-sectional view of a main part showing another example of a rotor forming apparatus.

FIG. 10 is an enlarged cross-sectional view of a main part showing another example of a rotor forming apparatus.

FIG. 11 is a perspective view of a main part of another example of a rotor coarse material.

FIG. 12 is a front view of another example of a rotor coarse material.

FIG. 13 is a side view of another example of a rotor coarse material.

FIG. 14 is a cross-sectional view of another example of a rotor.

FIG. 15 is an enlarged sectional view of a main part showing a conventional method for manufacturing a rotor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... rotor, 10a ... rotor rough material, 11 ... rotor shaft as a rotating shaft, 12 ... spacer, 12b ... outer surface as a radial outer surface, 13 ... magnet, 22, 23, 2
5, 26: Upper and lower molds as molds, 22a, 23
a, 25a, 26a: concave portions as cavities, resin inlets 22h, 23h, 25e: resin inlets as gates, 30: magnet holder, M: resin mold material.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29L 31:08 B29L 31:08 (72) Inventor Takanori Taguchi 390 Umeda, Kosai City, Shizuoka Pref. In-house F term (reference) 4F202 AD03 AD35 AH04 CA11 CB01 CB12 CB20 CK06 CK41 CQ05 4F206 AD03 AD35 AH04 JA07 JB12 JB20 JQ81 5H615 AA01 BB01 BB07 BB14 PP02 SS44 5H622 CA02 CA07 CB01 PP20

Claims (6)

[Claims] 1. A rotating shaft (11), and a spacer (12) integrally rotating with the rotating shaft (11).
And a plurality of magnets (13) provided on a radially outer surface (12b) of the spacer (12). Each of the magnets (13) is formed of a resin mold material (M). A method for manufacturing a rotor, wherein a rotor is molded and fixed to a radially outer surface (12b), wherein each of the magnets (13) is injected by a pressure of the resin molding material (M).
b) a method for manufacturing a rotor, wherein the method is pressed. 2. The method for manufacturing a rotor according to claim 1, wherein each of the magnets is pressed in both a radial direction and an axial direction of the spacer by an injection pressure of the resin molding material. A method for manufacturing a rotor. 3. A rotating shaft (11), and a spacer (12) integrally rotating with the rotating shaft (11).
And a plurality of magnets (13) molded and fixed to a radially outer surface (12b) of the spacer (12) with a resin molding material (M). 13) manufacturing the rotor, wherein 13) is temporarily fixed in advance to the radially outer surface (12b) of the spacer (12) with the magnet holder (30) and is molded and fixed with the resin molding material (M). Method. 4. The method for manufacturing a rotor according to claim 3, wherein the magnet holder (30) is formed of the same material as the resin molding material (M). 5. A rotating shaft (11) and said rotating shaft (11)
A spacer (12) integrally rotating with the spacer (1);
The rotor coarse material (10a) composed of a plurality of magnets (13) provided on the radial outer surface (12b) of (2) is applied to a pair of molds (22, 23, 25, 26) that can be opened and closed. Cavities to be formed (22a, 23a, 25a, 26a)
The resin molding material (M) is injected from gates (22h, 23h, 25e) provided in the molds (22, 23, 25, 26), and the magnets (13) are replaced with resin molding materials. (M) A molding device for a rotor, which is molded and fixed to a radially outer surface (12b) of a spacer (12), wherein the gate (22h, 23h, 25e) is formed by the resin molding material (M). A rotor is provided at a predetermined position of the mold (22, 23, 25, 26) so as to press a magnet (13) against a radially outer surface (12b) of the spacer (12). apparatus. 6. The rotor molding apparatus according to claim 5, wherein the gates (22h, 23h) are arranged such that the resin molding material (M) connects the magnets (13) in a radial direction of the spacer (12). The die (2) is pressed in both axial directions.
2, 23) The rotor molding apparatus provided at a predetermined position.