JPH09163645A - Iron core and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a salient pole ratio, thereby obtaining the rotor of high efficiency by forming an iron core of a magnetic member having the part which is cracked or plastically deformed along a desired magnetic circuit. SOLUTION: First, a magnetic member 2 is inserted between first press dies 6 comprising an upper die 4 having a projection 4a in the predetermined position of its lower surface and a lower die 5 having a recessed part 5a capable of being fitted into the position corresponding to the projection 4a disposed on the lower side of the upper die 4. After the upper die 4 is dropped so as to abut on the lower die 5, when the upper die 4 is lifted up, a semi-blanked part 7 is formed. Next, the magnetic member 2 is inserted between second press dies 10 comprising an upper die 8 having a flat lower surface and a lower die 9 having a flat upper surface, and after the upper die 8 is dropped so as to abut on the lower die 9, when the upper die 8 is lifted up, the semi-blanked part 7 restores its original form, and the part 2a to be cracked or plastically deformed is formed. For that reason, the inside of the part 2a has low permeability and makes a magnetic barrier, so that it shows the same function as that in the case of laminating a magnetic member in the radial direction, thereby enhancing a salient pole ratio.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric motor,
The present invention relates to improving the efficiency of a rotor of a rotary electric machine such as a generator, and particularly relates to the structure of the iron core of the rotor.

[0002]

2. Description of the Related Art Generally, a rotor of a rotary electric machine is shown in FIG.
By stacking a plurality of plate-shaped magnetic members having an outer shape as shown in FIG. 0 in the axial direction, generation of eddy current is suppressed and efficiency is improved. Further, as shown in FIG. 11, it is considered that the efficiency can be further improved by stacking arc-shaped plate-shaped magnetic members in the radial direction to increase the salient pole ratio.

[0003]

However, FIG.
There is a problem in that it is structurally almost impossible to simultaneously achieve the radial laminated structure as shown in FIG. 10 at the same time as the axial laminated structure as shown in FIG. 10, and it is very difficult to put into practical use.

The present invention has been made in order to solve the above-mentioned problems. By increasing the salient pole ratio by giving each magnetic member to be laminated a function equivalent to that in the radial direction, An object of the present invention is to provide an iron core from which a highly efficient rotor can be easily obtained.

[0005]

The iron core according to claim 1 of the present invention is constituted by a magnetic member having a portion which is cracked or plastically deformed along a desired magnetic circuit.

According to a second aspect of the present invention, the iron core is made of a magnetic member having alternating portions of elastic regions and plastic regions along with a desired magnetic circuit and punched slit portions. is there.

The iron core according to claim 3 of the present invention is the iron core according to claim 1 or 2, wherein a plurality of magnetic members are laminated.

The iron core according to a fourth aspect of the present invention is the iron core according to the third aspect, in which magnetic circuits are sequentially shifted in the circumferential direction for each of the laminated magnetic members.

According to a fifth aspect of the present invention, in the iron core according to the third aspect, the portions to be crimped for stacking and fixing the magnetic members are arranged between the portions that are cracked or plastically deformed. Is.

According to a sixth aspect of the present invention, in the method for manufacturing an iron core, a step of forming a half-blanked portion by a press die, and a step of returning cracks or plastic deformation based on the half-blanked portion. And a step of forming a part to be given.

According to a seventh aspect of the present invention, in the iron core manufacturing method according to the sixth aspect, the half-drawing amount of the press die at the time of forming the half-opened portion is adjusted. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing a configuration of an iron core of a rotor of a reluctance motor according to Embodiment 1 of the present invention, and FIG. 2 is a front view showing an enlarged configuration of a portion A in FIG. In the figure, 1 is a rotor shaft, 2 is a plurality of magnetic members that are laminated and fixed on the rotor shaft 1 to form an iron core 3, and are arranged along a desired magnetic circuit as shown by broken lines in the drawing. A large number of portions 2a that have been subjected to a pullback process and that have been cracked or plastically deformed are arranged at predetermined intervals.

Next, a method of forming the portion 2a on the magnetic member 2 constituting the iron core 3 in the first embodiment having the above-described configuration will be described with reference to 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, The magnetic member 2 is inserted into the first press die 6 which is composed of the lower die 5 having the recessed portion 5a that can be fitted with the die 4a.

After lowering the upper mold 4 and bringing the lower surface into contact with the upper surface of the lower mold 5, the upper mold 4 is raised and returned to its original state.
As shown in the figure, the half-blanked portion 7 is formed. Next, the 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 die 9 to the lower die 9. When the upper die 8 is lifted and returned to the original state after being brought into contact with the upper surface, the half-cut portion 7 formed by the first press die 6 is returned to the original state as shown in the figure,
As shown in detail in FIG. 4, a portion 2a that gives a crack or plastic deformation is formed.

The inside of the portion 2a thus formed is
Strain is generated due to cracking or plastic deformation, and the magnetic permeability is considerably reduced. Therefore, if the portions 2a are formed along the desired magnetic circuit as described above, the group of these portions 2a serves as a magnetic barrier and exhibits the same function as if magnetic members were laminated in the radial direction. Since the salient pole ratio can be improved, a highly efficient rotor can be easily obtained.

Embodiment 2 Further, FIG. 5 shows that in the first embodiment, when the half-pressed portion 7 is formed by the first press die 6, the half-drawback amount d determined by the protrusion dimension h of the projection 4a of the upper die 4 and the magnetic It is a characteristic view showing the relationship with the strength K of the member 2. As is clear from the figure, the strength K decreases as the half-drawback amount d increases. on the other hand,
Considering magnetically, the magnetic barrier effect increases as the half-drawback amount d increases. Therefore, this half-drawback amount d is set to the protrusion 4 of the upper die 4 of the first press die 6.
If it is controlled by changing the protrusion size h of a, the desired magnetic barrier effect can be obtained and the salient pole ratio can be adjusted.

Embodiment 3 FIG. 6 is a perspective view showing the structure of the iron core of the rotor according to the third embodiment of the present invention.
In the figure, 11 is a plurality of magnetic members that are laminated and fixed on a rotor shaft (not shown) to form an iron core 12,
As shown by the broken line in the figure, along the desired magnetic circuit, the part 11 that has been subjected to half-punch back processing and has been given a crack or plastic deformation
A and a large number of slit portions 11b punched by press working alternately with the portions 11a are arranged at a predetermined interval.

As described above, according to the third embodiment, since the slit portions 11b having lower magnetic conductivity than the portion 11a are arranged alternately with the portion 11a along the magnetic circuit,
A magnetic barrier effect can be expected more than in the first embodiment, and the salient pole ratio can be further increased.

Embodiment 4 FIG. 7 is a perspective view showing a partially broken structure of an iron core of a rotor according to a fourth embodiment of the present invention. In the figure, 13 are a plurality of magnetic members that are laminated and fixed to a rotor shaft (not shown) to form an iron core 14, and are half-punched back along a desired magnetic circuit as shown by the broken line in the figure. A large number of parts 13a subjected to cracking or being plastically deformed are arranged at predetermined intervals, and the positions of the parts 13a are sequentially shifted in the circumferential direction for each magnetic member.

As described above, according to the fourth embodiment, the arrangement positions of the parts 13a are formed for each magnetic member 13 so as to be slightly shifted in the circumferential direction, so that the magnetic circuit is slightly displaced in the stacking direction. As a result, it is possible to improve the characteristics such that the cogging torque of the motor is reduced and the uneven rotation is reduced.

Embodiment 5 In the fourth embodiment described above, the position where the portion 13a is formed to shift the magnetic circuit is slightly shifted for each magnetic member 13. However, a plurality of magnetic members having the same portion 13a are formed at the same position. It is needless to say that 13 may be gradually shifted in the circumferential direction and stacked, and the same effect as in the case of the fourth embodiment can be exhibited.

Embodiment 6 FIG. 8 is a perspective view showing a structure of an iron core of a rotor according to a sixth embodiment of the present invention, and FIG. 9 is a sectional view showing a section taken along line IX-IX in FIG. In the figure, reference numeral 15 denotes a plurality of magnetic members that are laminated and fixed on a rotor shaft (not shown) to form an iron core 16, and are half-punched back along a desired magnetic circuit as indicated by broken lines in the drawing. A large number of cracked or plastically deformed parts 15a are arranged at a predetermined interval, and the laminated magnetic members 15 are fixed in a mold (not shown) by punching and caulking. Extruded part 15
b is arranged so as to be located between the respective parts 15a.

As described above, according to the sixth embodiment, the punched and crimped portions 15b formed for stacking and fixing the magnetic members 15 are arranged between the portions 15a. Of course, the portion 15b can achieve the initial purpose of firmly fixing the magnetic members 15, but it does not hinder the magnetic circuit in the longitudinal direction and does not hinder the magnetic circuit in the lateral direction. A magnetic barrier effect can be expected while contributing to formation of a desired magnetic circuit.

Embodiment 7 FIG. In each of the above-described embodiments, the case of the iron core of the rotor of the reluctance motor in the first embodiment has been described as an example, but the present invention is not limited to this, and other motors, generators, etc. It is needless to say that the present invention can be applied to the iron core of a rotary electric machine and can exhibit the same effects as those of the above-described embodiments.

Embodiment 8 FIG. Further, in each of the above-mentioned embodiments, the case where the magnetic cores are laminated to form the iron core has been described as an example. However, a portion that is cracked or plastically deformed along a desired magnetic circuit is formed, and a salient pole ratio is formed. Of course, the present invention is not limited to this as long as the purpose is only to increase.

[0026]

As described above, according to the first aspect of the present invention, since the magnetic member has a portion which is cracked or plastically deformed along a desired magnetic circuit, the salient pole ratio can be increased. As a result, it is possible to provide an iron core from which a highly efficient rotor can be easily obtained.

Further, according to the second aspect of the present invention, the magnetic member is formed by alternately having a punched slit portion and a portion where the elastic region and the plastic region are mixed along the desired magnetic circuit. By increasing the salient pole ratio, it is possible to provide an iron core from which a highly efficient rotor can be easily obtained.

According to claim 3 of the present invention, since a plurality of magnetic members are laminated in claim 1 or 2, a salient pole ratio can be increased and an eddy current can be suppressed to facilitate a highly efficient rotor. It is possible to provide an iron core that can be obtained.

According to a fourth aspect of the present invention, in the third aspect, the magnetic circuits are formed so as to be sequentially shifted in the circumferential direction for each of the laminated magnetic members, so that the salient pole ratio is increased. By suppressing the eddy current, not only a highly efficient rotor can be easily obtained, but also an iron core that can improve the performance of the rotating electric machine can be provided.

According to a fifth aspect of the present invention, in the third aspect, the portions to be crimped for stacking and fixing the magnetic members are arranged between the portions that are cracked or plastically deformed. Further, by increasing the salient pole ratio, it is possible to provide an iron core from which a highly efficient rotor can be easily obtained.

According to a sixth aspect of the present invention, a step of forming a half-blanked portion by a press die, and a portion for giving back crack or plastic deformation to the original half-blanked portion are formed. It is possible to provide the iron core manufacturing method capable of easily obtaining a highly efficient rotor by increasing the salient pole ratio.

According to a seventh aspect of the present invention, in the sixth aspect, since the half blanking amount of the press die when forming the half blanked portion is adjusted, the salient pole ratio is desired. It is possible to provide a method for manufacturing an iron core that can easily obtain a highly efficient rotor by increasing the value of.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of an iron core of a rotor of a reluctance motor according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing a configuration of a portion A in FIG.

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

FIG. 4 is a diagram schematically showing a state of a portion of a magnetic member obtained by the manufacturing method shown in FIG.

FIG. 5 is a characteristic diagram showing a relationship between a half-punching back amount d of a half-punching portion formed during the process of the manufacturing method shown in FIG. 3 and the strength K of the magnetic member.

FIG. 6 is a perspective view showing a structure of an iron core of a rotor according to a third embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view showing a structure of an iron core of a rotor according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a structure of an iron core of a rotor according to a sixth embodiment of the present invention.

9 is a cross-sectional view showing a cross section taken along line IX-IX in FIG.

FIG. 10 is a diagram showing an outer shape of a rotor of a general rotary electric machine.

11 is a diagram showing the outer shape of a rotor of a rotating electric machine different from that in FIG.

[Explanation of symbols]

1 rotor shaft, 2,11,13,15 magnetic member, 2
a, 11a, 13a, 15a, 15b parts, 11b
Slit part, 3,12,14,16 iron core, 4,8 upper mold, 5,9 lower mold, 4a protrusion, 5a recessed part, 6 first press mold, 7 half blank part, 10 second press mold Type.

Front page continuation (72) Inventor Akihiro Aoki 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (7)

[Claims] 1. An iron core comprising a magnetic member having a portion which is cracked or plastically deformed along a desired magnetic circuit. 2. An iron core comprising a magnetic member having alternating portions of a crack or plastic deformation along a desired magnetic circuit and punched slit portions. 3. The iron core according to claim 1, wherein a plurality of magnetic members are laminated. 4. The iron core according to claim 3, wherein the magnetic circuit is formed so as to be sequentially displaced in the circumferential direction for each laminated magnetic member. 5. The iron core according to claim 3, wherein the portions to be punched out for stacking and fixing the magnetic members are arranged between the portions that are cracked or plastically deformed. 6. A step of forming a part in a half-blanked state by a press die, and a step of forming a part which gives back crack or plastic deformation to the original part in the half-blanked state. Method for manufacturing iron core. 7. The method for manufacturing an iron core according to claim 6, wherein the half-pressing amount of the press die when forming the half-pressed part is adjusted.