JP2001157395A - Magnet buried rotor, its manufacture method and forming jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet buried rotor which can easily obtain an extraction stop function without giving force to a permanent magnet. SOLUTION: A laminated iron core 7 formed by laminating plate-like magnetic members 2 and 6, multiple holes 4 which are arranged at the end face of the laminated iron core 7 through prescribed intervals in a peripheral direction and are formed by piercing them in the axial direction, permanent magnets 8 fit-inserted to the respective hole parts 4, forming holes 5 formed close to the center sides of the laminated iron core 7 in the holes 4 and 12 which exist between the holes 4 and the forming holes 5, make the end part sides of areas L, which avoid the permanent magnets 8, protrude to hole part 4-sides by deforming the forming holes 5 and restrict the movement of the permanent magnets 8, are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is constructed by inserting permanent magnets into a plurality of holes formed in the end face of a laminated core at predetermined intervals in the circumferential direction and penetrating in the axial direction. The present invention relates to a magnet embedded type rotor, a method of manufacturing the same, and a molding jig.

[0002]

2. Description of the Related Art A conventional magnet-embedded rotor of this type is not shown in the drawings, but is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-174326, through a hole in a laminated core into which a permanent magnet is inserted. In order to prevent falling off, a part of the laminated core at the opening end side of the hole is deformed with a jig, and a permanent magnet is pressed by the deformed part to fix the laminated core to the laminated core. I have.

[0003]

As described above, the conventional magnet-embedded rotor uses a jig to deform a part of the laminated core at the opening end of the hole into which the permanent magnet is inserted. By pressing and fixing the permanent magnet at the part where it was fixed, the permanent magnet is prevented from falling out of the hole, so the force is applied to the permanent magnet at the time of deformation, cracking or chipping of the permanent magnet There was a problem of causing trouble.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an embedded magnet rotor capable of obtaining a retaining function without applying a force to a permanent magnet, and a method of manufacturing the same. And a molding jig.

[0005]

According to a first aspect of the present invention, there is provided a magnet-embedded rotor, comprising: a laminated core formed by laminating plate-shaped magnetic members; A plurality of holes that are arranged at intervals and are formed to penetrate in the axial direction, respectively, a permanent magnet that is inserted into each of the holes, and a hole that is close to the center side of each of the laminated cores. The formed molding hole, and the end side of the region avoiding the permanent magnet by deforming the molding hole located between the hole and the molding hole, is projected to the hole side to form the permanent magnet. And a part for restricting movement.

Further, in the magnet embedded type rotor according to claim 2 of the present invention, in claim 1, the forming hole is formed so as to penetrate in the laminating direction of the laminated core.

According to a third aspect of the present invention, there is provided an embedded magnet type rotator according to the first aspect, wherein the forming hole is formed in an oval shape which is long in the circumferential direction.

According to a fourth aspect of the present invention, there is provided a magnet-embedded rotor according to any one of the first to third aspects, wherein the forming hole is formed at a longitudinally central portion of the hole. It is.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a magnet-embedded rotor, comprising: laminating and integrating plate-shaped magnetic members to form a laminated core; A step of forming a plurality of holes by extending in the stacking direction at a predetermined interval, and a step of forming a molding hole that is long in the circumferential direction by bringing each hole close to the center side of the laminated iron core; A step of fitting permanent magnets into the holes, and an end side of a region between the holes and the molding holes avoiding the permanent magnets by deforming each molding hole with a jig. And projecting it toward the hole.

According to a sixth aspect of the present invention, there is provided a molding jig for a magnet-embedded rotor, wherein the jig is formed in a rod shape having a cross-sectional shape capable of being fitted into an elliptical molding hole, and has a predetermined shape centered on an axis. By rotating by an angle of, the molding hole is deformed so that a portion between the hole in which the permanent magnet is inserted and the molding hole projects toward the hole. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of an embedded magnet rotor according to Embodiment 1 of the present invention,
(A) is a front view, (B) is a cross-sectional view showing a cross section along line BB in (A), FIG. 2 is a front view showing a configuration of a laminated core in FIG. 1, and FIG. 3 is a laminated view in FIG. FIG. 4 is a cross-sectional view showing a process of inserting a permanent magnet into an iron core. FIG. 4 is a front view showing a configuration of a forming jig used in a manufacturing process of the magnet-embedded rotor shown in FIG. 1, and FIG. FIG. 4A is a cross-sectional view showing a state in which a forming jig is inserted into the forming hole by deforming the forming hole using a tool.
(B) is a sectional view showing a state in which a molding jig is operated to deform a molding hole to form a portion for restricting movement of a permanent magnet.

In the drawing, reference numeral 1 denotes a rotor shaft, and 2 denotes a cross-section in which a shaft hole 3 through which the rotor shaft 1 is fitted and which can be penetrated is arranged at a predetermined distance in the circumferential direction near the outer periphery. A plurality of rectangular holes 4 are formed, and a molding hole 5 having an elliptical cross section is formed in the vicinity of the center of each of the holes 4 corresponding to the shaft hole 3. Like the first plate-shaped magnetic member 2, the plurality of first plate-shaped magnetic members 6 are provided with shaft holes 3 through which the rotor shaft 1 can be fitted and penetrated in the center, near the outer periphery. A plurality of second plate-shaped magnetic members each having a plurality of holes 4 arranged at predetermined intervals in a circumferential direction.

Numeral 7 designates a plurality of second plate-shaped magnetic members 6 arranged at a central portion, and a plurality of first plate-shaped magnetic members 2 arranged at both ends of each of the two plate-shaped magnetic members 6 so as to form respective holes. 4 are laminated so that they coincide with each other, and are fixedly integrated by, for example, punching or the like, 8 are a plurality of permanent magnets respectively fitted into the holes 4 of the laminated core 7, and 9 are the laminated cores 7. A shaft portion 10 composed of a small-diameter portion 10a having an oval cross section that can be inserted into each of the molding holes 5 and a large-diameter portion 10b connected thereto, and a handle portion 11 attached to the shaft portion 10. The molding jig 12 is located between each hole 4 and the molding hole 5, and as shown in FIG. It is a part that protrudes toward the hole 4 and restricts the movement of the permanent magnet 8.

Next, a method of manufacturing the magnet-embedded rotor according to the first embodiment configured as described above will be described. First, a first plate-shaped magnetic member 2 having a shaft hole 3, a hole 4, and a forming hole 5 by punching, and a second plate-shaped magnetic member having a shaft hole 3, a hole 4 6 are formed. Next, as shown in FIG. 3, a large number of second plate-shaped magnetic members 6 are arranged at the center so as to have a thickness corresponding to the length dimension of the permanent magnet 8, and several sheets are provided at both ends thereof. The first plate-shaped magnetic member 2 is disposed and laminated so that the shaft holes 3 and the holes 4 of each other coincide with each other.
For example, the laminated iron core 7 is formed by being fixedly integrated by, for example, caulking.

Next, the rotor shaft 1 is fitted and fixed in the shaft hole 3 of the laminated core 7, and the permanent magnet 8 is fitted in each hole 4. At this time, the permanent magnets 8 are installed at positions corresponding to the respective second plate-shaped magnetic members 6. Next, the small diameter portion 10a of the forming jig 9 shown in FIG. 4 is fitted into the forming hole 5 as shown in FIG. By operating the handle 11 of the molding jig 9 in this state, the shaft 10 is rotated as shown in FIG.
a is displaced by 90 degrees. Then, the forming hole 5 is deformed by this rotational force, and a region (indicated by L in FIG. 1) avoiding the permanent magnet 8 protrudes toward the hole 4, and the permanent magnet 8 is formed by a portion 12 formed thereby. Is prevented from dropping out of the hole 4. Thereafter, the same operation as described above is repeated for each of the remaining molding holes 5, so that all the permanent magnets 8 are prevented from coming off, and the magnet embedded rotor is completed.

As described above, according to the first embodiment, each of the holes 4 into which the permanent magnets 8 are inserted is close to the side corresponding to each of the shaft holes 3, and has a shape of an elliptical cross section. By forming a hole 5 and deforming the forming hole 5 with a forming jig 9, a region avoiding the permanent magnet 8 is protruded toward the hole 4 to form a region 12. Since the movement of the permanent magnet 8 is restricted, it is possible to easily prevent the permanent magnet 8 from falling out of the hole 4 without applying a force to the permanent magnet 8.

Further, since the forming hole 5 is formed at the center of the hole 4 in the longitudinal direction, the forming hole 5 is formed by the permanent magnet 8 by the laminated core 7 as is apparent from FIG.
The influence of the magnetic flux 13 flowing inside the rotor is small, and it is possible to prevent the efficiency of the magnet embedded rotor from decreasing.

Embodiment 2 FIG. 7A and 7B show a configuration of an embedded magnet rotor according to Embodiment 2 of the present invention, wherein FIG. 7A is a front view, FIG. 7B is a cross-sectional view showing a cross section taken along line BB in FIG. 8 shows the configuration of the laminated core in FIG. 7, (A) is a front view, and (B) is a line BB in (A).
FIG. 4 is a cross-sectional view showing a cross section taken along a line. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 14 denotes a first plate-shaped magnetic member 2 having a shaft hole 3, a hole 4, and a forming hole 5 as shown in FIG.
Is a laminated iron core formed by laminating a desired number of holes such that the shaft holes 3, the holes 4 and the forming holes 5 coincide with each other, and fixing and integrating them by, for example, caulking. By forming the laminated core only with the first plate-shaped magnetic member 2 as described above, the forming hole 5 is formed to penetrate the entire length of the laminated core in the laminating direction.

In the second embodiment, first, the rotor shaft 1 is fitted and fixed to the shaft hole 3 of the laminated iron core 14 configured as described above, and the permanent magnet 8 is inserted into each hole 4. Are fitted into each other, and are set at almost the center. In this state, the small-diameter portion 10a of the forming jig 9 similar to that of the first embodiment shown in FIG. The shaft portion 1 is inserted into the hole 5 and the handle 11 is operated.
By rotating 0, the small diameter portion 10a is displaced by 90 degrees. Then, the forming hole 5 is deformed by this rotational force, and a region (indicated by L in FIG. 7) avoiding the permanent magnet 8 protrudes toward the hole 4, and the permanent magnet 8 is formed by a portion 15 formed thereby. Is prevented from dropping out of the hole 4. Thereafter, the same operation as described above is repeated for each of the remaining molding holes 5, so that all the permanent magnets 8 are prevented from coming off, and the magnet embedded rotor is completed.

As described above, according to the second embodiment, similarly to the first embodiment, by deforming the molding hole 5 with the molding jig 9, the area avoiding the permanent magnet 8 can be formed in the hole. Projecting toward the part 4 to form a part 15,
Since the movement of the permanent magnet 8 is regulated by the portion 15, the permanent magnet 8 can be easily prevented from dropping out of the hole 4 without applying a force to the permanent magnet 8, and, of course, the molding can be performed. The first plate-shaped magnetic member 2 is formed by penetrating the hole 5 for the entire length in the stacking direction.
It is possible to form the laminated core 14 only by using the magnetic core 2 and the laminated core 7 with the two plate-shaped magnetic members 2 and 6. Can be planned.

Embodiment 3 9A and 9B show a configuration of an embedded magnet rotor according to Embodiment 3 of the present invention, wherein FIG. 9A is a front view, FIG. 9B is a cross-sectional view showing a cross section along line BB in FIG. FIG. 10 shows the configuration of the laminated core in FIG. 9, (A) is a front view, and (B) is a line B- in (A).
FIG. 11 is a cross-sectional view showing a cross section along B, and FIG. 11 is a front view showing a main part of the laminated iron core in FIG. 9 having a configuration different from that in FIG. In the figure, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

Numeral 16 designates the number of the second plate-shaped magnetic members 6 corresponding to the entire length of the permanent magnet 8 at the center as shown in FIG.
At the one end, several first plate-shaped magnetic members 2 are respectively arranged, and at the other end, the same shape as the shaft hole 3 and the hole 4 of both plate-shaped magnetic parts 2, 6 is provided. Part 1 of the projection
A third plate-shaped magnetic member 18 having a hole 7 in which a permanent magnet 8 cannot be inserted is formed, and a hole 3 for each shaft, holes 4, 17 and a hole 5 for forming are formed. This is a laminated iron core formed by laminating them so as to match each other, and fixing and integrating them by, for example, caulking.

In the third embodiment, first, the rotor shaft 1 is fitted and fixed to the shaft hole 3 of the laminated iron core 16 configured as described above, and the permanent magnet 8 is fitted to each hole 4. Are respectively fitted, and are installed in a state where they are brought into contact with the steps of the holes 4 and 17. In this state, the first embodiment
4. The small diameter portion 10a of the forming jig 9 shown in FIG.
Into the forming hole 5 corresponding to the first plate-shaped magnetic member 2 having several ends that do not correspond to the permanent magnet 8, and the handle 1
The small-diameter portion 10a is displaced by 90 degrees by rotating the shaft portion 10 by operating 1. Then, the molding hole 5 is deformed by this rotational force, and a region (indicated by L in FIG. 9) avoiding the permanent magnet 8 protrudes toward the hole 4, and the permanent magnet 8 is formed by a portion 19 formed thereby. Is prevented from dropping out of the hole 4. Thereafter, the same operation as described above is repeated for each of the remaining molding holes 5, so that all the permanent magnets 8 are prevented from coming off, and the magnet embedded rotor is completed.

As described above, according to the third embodiment, the permanent magnet 8 is avoided by deforming the molding hole 5 with the molding jig 9 as in the first and second embodiments. The region is projected to the side of the hole 4 so that the region 19
Is formed, and the movement of the permanent magnet 8 is regulated by the portion 19, so that the permanent magnet 8 can be easily prevented from dropping out of the hole 4 without applying a force to the permanent magnet 8. Of course, the permanent magnet 8 at the other end of the laminated iron core 16 is prevented from falling off by the projections 17a formed in the holes 17 of the third plate-shaped magnetic member 18, so that the molding process is performed. Since the work of preventing the falling off by the tool 9 can be completed only at one end side,
It is possible to improve the assembly workability.

In the first to third embodiments, the case where one hole 5 for forming is provided for each hole 4 has been described. However, the present invention is not limited to this. As shown in (2), two molding holes 5 may be provided for the holes 4, and in this case, the strength of the falling-off preventing portion, that is, the portion 20 can be improved. Also, as in each of the first to third embodiments,
By making the shape of the forming hole 5 a long oval in the circumferential direction, it is possible to easily deform it with a forming jig 9 as shown in FIG. 4, but it is not limited to this. .
Furthermore, the case where the laminated iron cores 7, 14, 16 in each of the first to third embodiments are fixed and integrated by crimping has been described. However, for example, the laminated iron cores 7, 14, and 16 are fixed and integrated using another method such as welding. Needless to say, this may be done.

[0026]

As described above, according to the first aspect of the present invention, a laminated iron core formed by laminating plate-shaped magnetic members is provided.
A plurality of holes formed in the end surface of the laminated core at predetermined intervals in the circumferential direction and penetrating in the axial direction, respectively, a permanent magnet inserted in each hole, and a hole in each hole. A forming hole formed in the vicinity of the center of the laminated core, and an end side of a region between the holes and the forming hole, which avoids the permanent magnet by deforming the forming hole. And a part for restricting the movement of the permanent magnet by projecting the permanent magnet to the hole side, so that an embedded magnet rotor capable of easily obtaining a retaining function without applying force to the permanent magnet is provided. Can be.

According to a second aspect of the present invention, in the first aspect, since the forming hole is formed so as to penetrate in the laminating direction of the laminated core, it is easy to apply a force to the permanent magnet. In addition, it is possible to provide a magnet-embedded rotor capable of improving productivity as well as obtaining a retaining function.

According to the third aspect of the present invention, in the first aspect, the forming hole is formed in a long oval shape in the circumferential direction, so that the permanent magnet can be easily applied without applying force to the permanent magnet. It is possible to provide a magnet-embedded rotor capable of obtaining a retaining function.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the forming hole is formed at the center in the longitudinal direction of the hole, so that a force is applied to the permanent magnet. It is possible to provide a magnet-embedded rotor that can easily obtain a retaining function without giving it and can prevent a decrease in efficiency.

According to a fifth aspect of the present invention, there is provided a step of forming a laminated core by laminating and integrating plate-shaped magnetic members; Forming a plurality of holes, forming a plurality of holes in the circumferential direction by making the holes close to the center of the laminated core, and inserting a permanent magnet into each hole. And a step of projecting the end side of the region avoiding the permanent magnet in a portion located between the hole and the forming hole toward the hole by deforming each forming hole with a jig. So that
It is possible to provide a method of manufacturing a magnet-embedded rotor that can easily obtain a retaining function without applying force to a permanent magnet.

According to the sixth aspect of the present invention, the forming hole is formed in a rod shape having a cross-sectional shape that can be fitted into the oval forming hole, and is rotated by a predetermined angle about the axis. Since the portion is deformed so that the portion between the hole in which the permanent magnet is inserted and the hole for molding is projected to the hole side, the hole for molding can be easily deformed. It is possible to provide a molding jig for the embedded magnet rotor.

[Brief description of the drawings]

FIG. 1 shows a configuration of an embedded magnet rotor according to Embodiment 1 of the present invention, where (A) is a front view and (B) is (A).
FIG. 4 is a cross-sectional view showing a cross section taken along line BB in FIG.

FIG. 2 is a front view showing a configuration of a laminated core in FIG.

FIG. 3 is a cross-sectional view showing a step of inserting a permanent magnet into the laminated core in FIG. 2;

FIG. 4 is a front view showing a configuration of a forming jig used in a manufacturing process of the magnet embedded rotor in FIG.

5A and 5B show a step of deforming a molding hole using the molding jig in FIG. 4; FIG. 5A is a cross-sectional view showing a state in which the molding jig is inserted into the molding hole; FIG. 4 is a cross-sectional view showing a state in which a molding jig is operated to deform a molding hole to form a portion that restricts movement of a permanent magnet.

FIG. 6 is a diagram schematically showing a distribution state of a magnetic flux flowing in a laminated iron core of the magnetic flux embedded rotor in FIG. 1;

7A and 7B show a configuration of an embedded magnet rotor according to a second embodiment of the present invention, wherein FIG. 7A is a front view, and FIG.
FIG. 4 is a cross-sectional view showing a cross section taken along line BB in FIG.

8 shows the configuration of the laminated core in FIG. 7, and FIG.
Is a front view, and (B) is a cross-sectional view showing a cross-section along line BB in (A).

9A and 9B show a configuration of an embedded magnet rotor according to a third embodiment of the present invention, wherein FIG. 9A is a front view, and FIG.
FIG. 4 is a cross-sectional view showing a cross section taken along line BB in FIG.

10 shows a configuration of a laminated core in FIG. 9,
(A) is a front view, (B) is a cross-sectional view showing a cross-section along line BB in (A).

11 is a front view showing a main part of the laminated iron core in FIG. 9 having a configuration different from that in FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotor shaft, 2 2nd plate-shaped magnetic members, 3 shaft holes, 4, 17 holes, 17a protrusions, 5 forming holes, 6 2nd plate-shaped magnetic members, 7, 14, 16 Laminated core, 8 permanent magnets, 9 molding jigs, 12, 15, 19,
20 parts, 13 magnetic flux, 18 third plate-shaped magnetic member,
L region.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Akita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Yoshimitsu Okawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5H622 CA02 CA05 CA14 CB05 PP03 PP10 PP11 PP13

Claims (6)

[Claims] 1. A laminated iron core formed by laminating plate-shaped magnetic members, and a plurality of iron cores arranged on an end face of the laminated iron core at a predetermined interval in a circumferential direction and respectively penetrating in an axial direction. Holes, a permanent magnet fitted into each of the holes, a molding hole formed in the vicinity of the center of the laminated iron core of each of the holes, and the hole and the molding hole. And a portion that restricts the movement of the permanent magnet by protruding the end side of the region avoiding the permanent magnet by deforming the molding hole portion between the portions and protruding toward the hole portion. Characterized magnet embedded rotor. 2. The magnet-embedded rotor according to claim 1, wherein the forming hole is formed so as to penetrate in a laminating direction of the laminated core. 3. The magnet-embedded rotor according to claim 1, wherein the forming hole is formed in an oval shape that is long in the circumferential direction. 4. The magnet-embedded rotor according to claim 1, wherein the forming hole is formed at a longitudinally central portion of the hole. 5. A step of laminating and integrating plate-shaped magnetic members to form a laminated core, and forming a plurality of holes by extending in the laminating direction at predetermined ends circumferentially at ends of the laminated core. A step of forming a molding hole that is long in the circumferential direction by bringing each hole close to the center side of the laminated core; and fitting a permanent magnet into each of the holes, Deforming the molding hole with a jig so that an end of a region located between the hole and the molding hole and avoiding the permanent magnet projects toward the hole. A method for manufacturing a magnet-embedded rotor, characterized in that: 6. A permanent magnet is formed by deforming the molding hole by rotating it by a predetermined angle around an axis, and is formed into a rod shape having a cross-sectional shape capable of being fitted into the elliptical molding hole. A molding jig for a magnet-embedded rotor, wherein a portion existing between the inserted hole and the molding hole is projected toward the hole.