JP3432344B2 - Laminated structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is formed by stacking a plurality of plate-like magnetic members each having a fitting hole into which a rotary shaft is press-fitted, such as a rotor core of a rotary electric machine. The present invention relates to the structure of the fitting portion of the laminated structure.

[0002]

2. Description of the Related Art A conventional laminated structure of this kind and the other structure forming a pair are fitted to each other by press fitting. However, the mechanical strength of each of the plate-shaped magnetic members forming the laminated structure is weak, so that distortion occurs and the performance deteriorates. On the other hand, in order to solve the problem of distortion due to such press fitting,
Fitting by shrink fitting is also used to heat and expand the laminated structure, insert the other structure into the fitting hole in this state, and then shrink and fix the laminated structure by returning it to room temperature. ing.

[0003]

The conventional laminated structure is
As described above, fitting by shrink fit is adopted to prevent the occurrence of distortion due to press fitting with the other pair of structures. However, there is a problem that the cost increases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a laminated structure capable of preventing the deterioration of the performance without increasing the cost. Is.

[0005]

A laminated structure according to claim 1 of the present invention is provided with a plurality of substantially flat plate-shaped members and a predetermined structure fitted in the central portion of each plate-shaped member. a fitting hole which is, to half blanking back processing within the plate-like member fitting hole near
And a region formed of a plurality of cracks formed in the thickness direction, and is formed by stacking a plurality of plate-shaped members.

A laminated structure according to a second aspect of the present invention is the laminated structure according to the first aspect, wherein a plurality of plate-shaped magnetic members having a fitting hole for a rotor shaft in a central portion are stacked. It is a rotor core of a rotating electric machine.

The laminated structure according to claim 3 of the present invention is the laminated structure according to claim 2, wherein the region formed by the crack is formed in an annular portion near the fitting hole inside the plate-shaped magnetic member. is there.

The laminated structure according to a fourth aspect of the present invention is the laminated structure according to the second aspect, wherein the region including the crack is radially formed from the fitting hole.

According to a fifth aspect of the present invention, there is provided a laminated structure comprising a plurality of substantially flat plate-like members and fitting members provided on the outer peripheral portion of the plate-like members so as to be fitted to a predetermined structure. A plurality of plate-shaped parts, and a region formed of a plurality of cracks formed in the thickness direction by half punching-back processing in a plane substantially parallel to the outer peripheral surface of the fitting part inside the plate-shaped member. It is formed by stacking members.

A laminated structure according to claim 6 of the present invention is a stator core of a rotating electric machine, which is formed by stacking a plurality of plate-shaped magnetic members having an outer peripheral surface fitted with a stator frame. Is.

According to a seventh aspect of the present invention, in the laminated structure according to the third or sixth aspect, a plurality of regions having cracks are formed inside the plate-shaped magnetic member, and the degree of cracking is different for each region having cracks. Differently, the distances from the inner surface of the fitting hole or the outer surface of the fitting portion are also different from each other.

According to an eighth aspect of the present invention, the laminated structure according to the fifth aspect is characterized in that at least a pair of plate-shaped magnetic members are fitted to each other by protrusions and recesses formed on surfaces facing each other. It is an integrated core of magnetic application equipment.

According to a ninth aspect of the present invention, in the eighth aspect, the cracked region is formed inside the plate-shaped magnetic member in a plane substantially parallel to the inner surface of the recess.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. An embodiment of the present invention will be described below with reference to the drawings.
1 is a perspective view showing a configuration of an iron core of a rotor as a laminated structure in Embodiment 1 of the present invention, and FIG. 2 is a sectional view showing a section taken along line II-II in FIG. In the figure, 1 has a rotor shaft, 2 has a fitting hole 2a in the center of which the rotor shaft 1 is inserted in the direction shown by the arrow in the drawing, and is provided on the inner side along the circumference of the fitting hole 2a. Is a plurality of layers formed in the thickness direction by the half-drawing-back process formed by the method described below.
2 is a plurality of plate-shaped magnetic members that are formed in the axial direction and are stacked in the axial direction to form the rotor core 3.

Next, in the plate-shaped magnetic member 2 constituting the rotor core 3 in the first embodiment having the above-mentioned structure,
A method of forming the crack 2b will be described based on FIG. First, the upper mold 4 having a large number of protrusions 4a protruding by a dimension h at predetermined positions on the lower surface, and the protrusions 4a of the upper mold 4 which are disposed below the upper mold 4 and correspond to the respective protrusions 4a of the upper mold 4, Four
The plate-shaped magnetic member 2 is inserted into the first press die 6 including the lower die 5 having the recess 5a that can be fitted with a.

Then, the upper die 4 is lowered to lower the lower die 5
When the upper die 4 is lifted and returned to the original state after being brought into contact with the upper surface of the above, the half-blanked portion 7 is formed as shown in the figure. Next, the plate-shaped magnetic member 2 is inserted between the second press dies 10 including the upper die 8 having a flat lower surface and the lower die 9 having a flat upper surface, and the upper die 8 is lowered to lower the lower surface. After contacting the upper surface of the mold 9, the upper mold 8 is lifted and returned to its original position as shown in the figure.
Double the half blanking portion 7 formed by the press die is returned to the original, in the thickness direction as schematically shown in detail in FIG. 4
A number of cracks 2b are formed.

As described above, according to the first embodiment, the crack 2 is formed on the inner side of the plate-shaped magnetic member 2 along the circumference of the fitting hole 2a.
Since the b is formed to locally weaken the strength, when the rotor shaft 1 is inserted into the fitting hole 2a, the crack 2b functions as a buffer portion, so that an unreasonable force is applied to the plate-shaped magnetic member 2. It becomes possible to easily perform insertion work without
Further, since a heating furnace or the like is not required, the cost will not be increased.

In the first embodiment described above, the case where two layers of the crack 2b are formed on the inner side along the circumference of the fitting hole 2a as shown in FIG. 1 has been described. It goes without saying that the effect of can be exhibited.

Further, as shown in FIG. 5, both ends are h ₁ and h at predetermined positions on the lower surface of the upper die 11 of the first press die 12.
Providing a large number of protrusions 11a protruding by a size different from ₂ ,
After inserting the plate-shaped magnetic member 2 between the upper die 11 and the lower die 5 and lowering the upper die 11 to bring the lower surface into contact with the upper surface of the lower die 5 as in the method described in FIG. , When the upper die 11 is raised and returned to the original state, the half-blanked portion 13 having the shape as shown in the figure
Is formed.

Next, the plate-shaped magnetic member 2 is inserted between the upper die 8 and the lower die 9 and the upper die 8 is lowered so that the lower surface is brought into contact with the upper surface of the lower die 9 and then the upper die 8 is removed. When it is lifted and returned to its original state, the half-blanked portion 13 formed by the first press die 12 is returned to its original state, and as shown in the schematic diagram of FIG. ₁ and 2b ₂ are respectively formed. Then, the crack 2b ₂ on the side half-cut at the end of the higher dimension h ₁ of the protrusion 11a is more half-cut than the crack 2b ₁ on the side half-cut at the end of the lower dimension h _2. The greater the amount of return, the greater the amount.

As described above, if a plurality of layers having different degrees , such as the cracks 2b ₁ and 2b ₂ , are formed, depending on the degree of fitting when the rotor shaft 1 is inserted, Corresponding cracks function as buffers,
It is not necessary to strictly set the dimensional relationship between the diameter of the rotor shaft 1 and the fitting hole 2a, and the insertion work becomes easier.

Furthermore, each of the cracks 2b, 2b ₁ , 2b described above
_Although all ₂ are formed in an annular shape on the inner side along the circumference of the fitting hole 2a, as shown in FIG. 7, cracks 2b ₃ may be formed radially from the fitting hole 2a. The effect of can be obtained.

Embodiment 2. FIG. 8 is a sectional view showing a structure of an iron core of a stator as a laminated structure according to the second embodiment of the present invention. In the figure, 14 is a stator frame, and 15 is a plurality of plate-like magnetic members constituting a stator iron core 16 that are axially laminated and fixed by being fitted to the inner surface side of the stator frame 14. On the inner side along the fitted outer peripheral surface, as in the case of the first embodiment, cracks 15a formed by performing the half-drawback process are arranged at predetermined intervals. Inside the stator iron core 16, a rotor iron core 3 integrated with a rotor shaft 1 supported by a stator frame 14 via bearings (not shown) is arranged.

As described above, according to the second embodiment, the cracks 15a are arranged at predetermined intervals on the inner side along the outer peripheral surface of each plate-shaped magnetic member 15 constituting the stator core 16, and the stator core is formed. Since the strength of the outer periphery of 16 is locally weakened, an unnecessary force is not applied when the stator core 16 is fitted into the stator frame 14, so that the insertion work becomes easy. That is, the accuracy of the rotor shaft 1 supported by the stator frame 14 via the bearing is not adversely affected, and a highly accurate motor can be obtained.

Incidentally, the cracks 15a can obtain the same effect even if they are radially arranged as shown in FIG. 7 in the first embodiment.

Embodiment 3. 9 is a perspective view showing a structure of an iron core of a small transformer as a magnetic application device according to a third embodiment of the present invention.
In the figure, reference numeral 17 denotes a plurality of first plate-shaped magnetic members each having a U-shape and projections 17a and 17b formed on both ends thereof, and 18 denotes both projections 17 of the first plate-shaped magnetic member 17.
At the positions corresponding to a and 17b, recesses 18a and 18b that can be fitted with both protrusions 17a and 17b are formed, and
A plurality of second plate-like magnetic members in which cracks 18c formed by subjecting the recesses 18a and 18b to a semi-pulling-back process are arranged with a predetermined interval are formed between the first and second recesses. The magnetic members 17 and 18 are the protrusions 17a and 1
7b and the depressions 18a and 18b are fitted to each other,
The transformer iron core 19 is configured by being laminated.

As described above, according to the third embodiment, the protrusions 17a and 17b of the first plate-shaped magnetic member 17 and the recesses 18a and 18b are fitted to each other to be integrated with each other. Since the crack 18c having locally weak strength is arranged in the vicinity of both the depressions 18a and 18b of the plate-shaped magnetic member 18, the first and second plate-shaped magnetic members 17,
It is possible to fit the 18 together without difficulty, which facilitates the assembling work, and it is also possible to obtain a high-performance transformer without magnetic adverse effects.

[0028]

As described above, according to claim 1 of the present invention, a plurality of substantially flat plate-like members and a predetermined structure are provided at the center of each plate-like member so as to be fitted therein. Through the fitting hole and the plate-shaped member near the fitting hole in the thickness direction by half blanking
And a region formed by a plurality of cracks formed in the above, and is formed by stacking a plurality of plate-shaped members, so that a laminated structure capable of preventing performance deterioration without increasing cost is provided. can do.

According to a second aspect of the present invention, there is provided a rotating electric machine according to the first aspect, wherein a plurality of plate-shaped magnetic members having a hole for fitting a rotor shaft in a central portion are stacked. Since it is applied to the rotor core, it goes without saying that it is possible to prevent performance deterioration without increasing cost.
The rotor shaft insertion work becomes easy.

Further, according to claim 3 of the present invention, in claim 2, since the region consisting of the crack is formed in the annular portion near the fitting hole inside the plate-like magnetic member, the cost is increased. It is of course possible to prevent the performance from deteriorating without doing so, and it becomes easy to insert the rotor shaft.

According to a fourth aspect of the present invention, in the second aspect, since the region including the cracks is formed radially from the fitting hole, the performance is prevented from being lowered without increasing the cost. It goes without saying that the rotor shaft can be inserted easily.

According to a fifth aspect of the present invention, a plurality of substantially flat plate-shaped members, and fitting portions provided on the outer peripheral portion of the plate-shaped members so as to be fitted to a predetermined structure, Half-drawing in a plane that is approximately parallel to the outer peripheral surface of the fitting part inside the plate member
A region composed of a plurality of cracks formed in the thickness direction by the tempering process is formed by stacking a plurality of plate-shaped members, so that the performance is prevented from degrading without increasing the cost. It is possible to provide a laminated structure capable of

According to a sixth aspect of the present invention, the fixing of the rotating electric machine according to the fifth aspect is formed by stacking a plurality of plate-shaped magnetic members having an outer peripheral surface fitted with the stator frame. Since it is applied to the child core, it is possible to prevent the performance from deteriorating without increasing the cost, and it is also possible to insert it into the stator frame without affecting the axial accuracy of the rotor shaft. become able to.

According to a seventh aspect of the present invention, in the third or sixth aspect, a plurality of regions having cracks are formed inside the plate-shaped magnetic member, and the degree of cracking varies depending on the regions having cracks. Since the distance from the inner surface of the hole or the outer peripheral surface of the fitting part is also different from each other, it is possible to prevent deterioration of performance without increasing cost, and of course, insertion work for fitting Will be even easier.

According to the eighth aspect of the present invention, in the fifth aspect, at least a pair of plate-shaped magnetic members are integrated by fitting the protrusions and the recesses formed on the surfaces facing each other. Since it was applied to the iron core of magnetic application equipment,
Not only the assembling work becomes easy, but also the performance of the device can be improved.

According to a ninth aspect of the present invention, in the eighth aspect, since the region composed of the crack is formed in a plane substantially parallel to the inner surface of the recess inside the plate-shaped magnetic member, Not only the assembling work becomes easy, but also the performance of the device can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of an iron core of a rotor as a laminated structure according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a section taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a method of manufacturing a plate-shaped magnetic member forming the iron core in FIG.

FIG. 4 is a diagram schematically showing a cracked state of the plate-shaped magnetic member obtained by the manufacturing method shown in FIG.

FIG. 5 is a cross-sectional view showing a method for manufacturing a plate-shaped magnetic member different from the manufacturing method shown in FIG.

FIG. 6 is a view schematically showing a cracked state of the plate-shaped magnetic member obtained by the manufacturing method shown in FIG.

7 is a perspective view showing a configuration of an iron core of a rotor as another laminated structure different from that shown in FIG. 1. FIG.

FIG. 8 is a sectional view showing a structure of an iron core of a stator as a laminated structure according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing a structure of an iron core of a small transformer as a magnetic application device according to a third embodiment of the present invention.

[Explanation of symbols]

1 rotor shaft, 2,15 plate-shaped magnetic members, 2a fitting _{hole, 2b, 2b 1, 2b 2} , 2b 3, 15a, 18c
Crack, 3 rotor core, 4,8,11 upper mold, 5,9
Lower mold, 4a, 11a protrusion, 5a recessed portion, 6, 12
1st press die, 7,13 half-drawing part, 10 2nd press die, 14 stator frame, 16 stator core.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-112839 (JP, A) JP-A-5-103449 (JP, A) JP-A-56-115150 (JP, A) JP-A-7- 336963 (JP, A) JP-A-9-163645 (JP, A) Actual opening Sho-48-109403 (JP, U) Actual opening 60-24150 (JP, U) Actual opening Sho-57-180444 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 1 / 28,1 / 18,15 / 02

Claims (9)

(57) [Claims] 1. A plurality of substantially flat plate-shaped members, a fitting hole provided in the central portion of each plate-shaped member for fitting a predetermined structure therein, and the plate-shaped members near the fitting holes. For half-punching back inside the member
A region composed of a plurality of cracks formed in the thickness direction ,
And a stack structure formed by stacking the plurality of plate-shaped members. 2. A rotor core of a rotary electric machine, which is formed by stacking a plurality of plate-shaped magnetic members having a hole for fitting with a rotor shaft in a central portion thereof. Laminated structure. 3. The laminated structure according to claim 2, wherein the region composed of the crack is formed in an annular portion near the fitting hole inside the plate-shaped magnetic member. 4. The laminated structure according to claim 2, wherein the region including the crack is formed radially from the fitting hole. 5. A plurality of substantially flat plate-shaped members, fitting portions provided on the outer peripheral portion of the plate-shaped member so as to be fitted to a predetermined structure, and the fitting inside the plate-shaped member. A region formed of a plurality of cracks formed in the thickness direction by half- drawback processing in a plane substantially parallel to the outer peripheral surface of the part, and formed by stacking the plurality of plate-shaped members A laminated structure characterized by the above. 6. The stator core of a rotary electric machine, which is formed by stacking a plurality of plate-shaped magnetic members having an outer peripheral surface that is fitted with a stator frame, according to claim 5. Structure. 7. A plurality of regions including the crack are formed inside the plate-shaped magnetic member, and the degree of the crack is different for each region including the crack, and the distance from the inner surface of the fitting hole or the outer peripheral surface of the fitting portion. 7. The laminated structure according to claim 3, wherein the two are also different from each other. 8. An iron core of a magnetic application device in which at least a pair of plate-shaped magnetic members are integrated by fitting projections and depressions formed on surfaces facing each other. The laminated structure described. 9. The laminated structure according to claim 8, wherein the region composed of the crack is formed in a plane substantially parallel to the inner surface of the recess inside the plate-shaped magnetic member.