JP3567305B2 - Core material for lamination - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator core of an electric motor mounted on a household electric appliance (for example, a fully automatic washing machine, a dishwasher, etc.), and more particularly, to an iron core having pole teeth and a yoke portion. The present invention relates to a lamination core material in which individual pieces are connected by an arbitrary number of substantially thin magnetic path portions and substantially V-shaped magnetic path portions, and is easily bent from a band shape or a rod shape into a ring shape.
[0002]
[Prior art]
Conventionally, in order to form a stator core of an electric motor forming an annular magnetic path, a core material for lamination, in which an arbitrary number of core pieces having pole teeth and a yoke portion are connected, is punched from a band-shaped silicon steel sheet, and The core material is sequentially laminated to form a rod-shaped core, and the rod-shaped core is formed into an annular shape to form a stator core of an electric motor, such that the core pieces are connected by a substantially thin magnetic path portion. The laminating core material having a cutout in the connecting portion includes, for example, a technique as disclosed in Japanese Patent Application Laid-Open No. 9-308143, in which the connecting portion has a pole tooth side edge to a yoke portion side edge. Some of them are provided with a substantially V-shaped recess and a substantially elliptical hole continuous with the recess.
[0003]
For reference, as a similar technique, in a rotor core of an electric motor, a notched lamination core material is disclosed in, for example, JP-A-6-54489 and JP-A-7-79551. There is technology. The former is characterized in that a substantially I-shaped notch (slit) is provided at the pole tooth side edge and a substantially V-shaped notch is provided at the yoke part side edge, and the latter is a yoke part side edge. Only a V-shaped concave portion is provided only in this case.
[0004]
[Problems to be solved by the invention]
However, as in the technique disclosed in Japanese Patent Application Laid-Open No. 9-308143 or the like, a stacking core in which the connecting portions are connected only by a substantially thin magnetic path portion to each other having iron poles and a yoke portion. In the case of raw materials, those that are manufactured consistently by fully automatic assembly machines are good, but for example, one company is in charge of the punching process by pressing, etc., and another company is in charge of loading and unloading and laminating process, In cases where it is not possible or not possible to perform integrated production, it is not considered to move the iron core material for lamination.Therefore, during normal transportation or storage, a load such as stress is applied to the connecting part, and Since the shape is easily broken, there is a problem that obstacles such as material breakage are likely to occur and handling is difficult.
Further, although it is easy to bend from a band or a rod to an annular shape, if it is returned to the band or the rod even a little, there is a problem that a slight crack is generated and eventually leads to an obstacle such as material breakage.
[0005]
The present invention has been made in view of such problems of the related art, and has as its object to prevent obstacles such as material breakage even when the core material for lamination is moved, and to form a belt-like material. Or, it is possible to provide a stator core of a motor having good magnetic strength and good electromagnetism characteristics by obtaining good strength and close contact matching with little distortion while maintaining workability that is easy to bend from a rod shape to a ring shape. It is assumed that.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a core material for lamination of the present invention is formed by punching a core material for lamination in which an arbitrary number of core pieces having pole teeth and a yoke portion are connected from a band-shaped silicon steel sheet. A rod-shaped core body is formed by sequentially laminating iron core materials, and the rod-shaped core body is formed into an annular shape to form a stator core of an electric motor, wherein the core pieces are substantially thin and substantially V-shaped. And a convex or concave portion such as a substantially half-moon shape, a substantially V-shape, or a substantially W-shape is provided at an edge of a pole tooth side of a connection portion of the iron core pieces. In the portion, a substantially arrow-shaped hole, a substantially diamond-shaped hole, a substantially V-shaped hole, a substantially T-shaped hole and the like, and a substantially round hole and a substantially elliptical hole connected to the hole are provided. The edge is provided with a concave portion such as a substantially half-moon shape, a substantially square shape or a substantially V-shaped shape.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 2, for example, from a strip-shaped hot-rolled silicon steel sheet having a thickness of 0.35 mm, a plurality of embossed projections 14 and a pole having no V-shaped notch are formed by an upside-down punching method with good yield. Lamination core material 10 and / or lamination core material 10 in which twelve core pieces 11 each having teeth 12 and yoke portion 15 are connected (the number may be any number depending on the type of electric motor; the same applies hereinafter). A plurality of embossing projections 34 provided at the same position as above, a pole tooth 32 having a V-shaped notch 33, and a core material 30 for lamination in which 12 core pieces 31 each having a yoke portion 35 are connected. Punch out. FIG. 1 is an enlarged plan view of a main part of FIG.
Of course, a single-row blanking method may be used.
[0008]
The details of the core material 10 for lamination of one embodiment will be described.
When the pole teeth 12 are placed on the upper part and the yoke part 15 is placed on the lower part, the left end part 26 of the yoke part 15 at the leftmost end of the core material for lamination 10 has a right end part when the pole teeth 12 are substantially at the center. It is shorter. The right end 27 of the yoke portion 15 at the rightmost end of the core material for lamination 10 is longer than the left end when the pole teeth 12 are substantially at the center.
The pole pieces 12 of the connecting portions 29 of the core pieces 11 are substantially connected to the pole teeth 12 side edges 18 such that the core pieces 11 are connected by the substantially thin magnetic path portion 16 and the substantially V-shaped magnetic path portion 17. A convex end 19 having a half-moon shape, a substantially V-shaped shape, a substantially U-shaped shape, a substantially W-shaped shape, or the like (in the second embodiment, as shown in FIG. 8, it is assumed that a convex end does not protrude from the side edge of the pole teeth. The same applies to the following.), A substantially arrow-shaped hole, a substantially diamond-shaped hole 20 and the like, and a hole 22 such as a substantially round hole and a substantially elliptical hole 21 connected to the hole 20 are formed at substantially the center of the connecting portion 29. A concave portion 24 having a substantially half-moon shape, a substantially square shape, a substantially V-shape, or the like is provided in the edge 23 on the yoke portion 15 side of the connection portion 29.
[0009]
The details of the core material 30 for lamination of one embodiment will be described.
When the pole teeth 32 are placed on the upper part and the yoke part 35 is placed on the lower part, the left end 46 of the yoke part 35 at the leftmost end of the core material for lamination 30 is attached to the right end 27 of the core material 10 for lamination. When the pole teeth 32 are substantially at the center, a plurality of V-shaped cutouts 45 are provided, which are longer than the right end. The right end 47 of the yoke portion 35 at the rightmost end of the core material for lamination 30 is shorter than the left end when the pole teeth 32 are substantially at the center.
The pole pieces 32 of the connecting portions 49 of the core pieces 31 are substantially attached to the side edges 38 so that the core pieces 31 are connected by the substantially thin magnetic path portion 36 and the substantially V-shaped magnetic path portion 37. A protruding end 39 having a half-moon shape, a substantially V shape, a substantially U shape, a substantially W shape, or the like is provided at a substantially central portion of the connecting portion 49 so as to be connected to the substantially arrow-shaped hole, the substantially rhombic hole 40, and the like. A perforation 42 such as a substantially round hole or a substantially elliptical hole 41 is provided, and a concave portion 44 such as a substantially half-moon shape, a substantially square shape, or a substantially V-shape is provided at an edge 43 of the connecting portion 49 on the yoke portion 35 side.
[0010]
As shown in FIG. 4, these two types of lamination core materials 10 and 30 are alternately or sequentially laminated to form a rod-shaped core body 50. FIG. 3 is an enlarged perspective view of a main part of FIG.
As a procedure, first, a predetermined number of the core material for lamination 10 and a predetermined number of the core material 30 for lamination are alternately laminated one by one, and a plurality of the projections 14 and 34 are lightly tapped and fitted. Fix it.
The embossing projections 14 and 34 have a circular half-cut shape for positioning the core pieces 11 and 31 at the time of lamination. The positions of the upper and lower iron core pieces 11 or 31 are regulated by fitting with a circle (for example, see the disclosure of Japanese Utility Model Application Laid-Open No. 61-77648). Therefore, the positions of the V-shaped cutouts 33 and 45 are also aligned with the designated positions, and the left and right ends of the rod-shaped core 50 have a comb shape.
In the above-described embodiment, the lamination core materials 10 and 30 are alternately laminated one by one. However, it is effective to use two or three core materials. Alternatively, a lamination core material other than the lamination core materials 10 and 30 may be provided and laminated.
The pressing portion 25 of the pole teeth 12 having no V-shaped notch in the core material for lamination 10 is press-cut and bent from the stacking direction by a triangular tooth punch 71 (see FIG. 7) as a jig or the like, for example. The core material for lamination 30 having the portion 33 is fixed by caulking.
Therefore, the above processing is repeated and the connection is completed because the pressure immediately follows the next stage.
[0011]
As shown in FIG. 5, the rod-shaped iron core body 50 is formed into an annular shape so that the comb-teeth shape at the right end of the rod-shaped iron core body 50 and the comb-teeth shape at the left end part are fitted to each other. The iron core 60 is used.
As shown in FIG. 5, FIG. 6, or FIG. 7, when the rod-shaped iron core body 50 is formed in an annular shape, the substantially V-shaped magnetic path portions 17 and 37 are deformed into a substantially U-shape. Is maintained, so that obstacles such as material breakage can be prevented. The substantially arrow-shaped holes and the substantially diamond-shaped holes 20 and 40 at the substantially central portion of the connecting portion are aligned with each other at the edges so that no gap is formed, and the magnetic resistance is reduced, so that good electro-magnetic characteristics can be obtained. Distortions such as undulations due to the bending work escape to the perforations 22 and 42 such as the substantially round holes and the substantially elliptical holes 21 and 41 connected to the holes 20 and 40, so that the distortion is small. In addition, the recesses 24 and 44 having a substantially half-moon shape, a substantially square shape, a substantially V-shaped shape, and the like minimize the spread crack caused by bending.
In the comb-shaped fitting portion, the pressing portion 28 of the right end portion 27 of the laminating core material 10 having no V-shaped cutouts on the inner and outer diameter sides of the stator core is moved in the laminating direction, for example. Pressing and bending with a U-shaped triangular tooth punch 70 (see FIG. 6) as a jig or the like, the lamination core material 30 having the V-shaped notch 45 is fixed by caulking.
Therefore, the above processing is repeated and the connection is completed because the pressure immediately follows the next stage.
[0012]
As shown in FIG. 9, a description will be given of a core material 80 for lamination according to a third embodiment.
In order that the core pieces 81 are connected by the substantially thin magnetic path portion 86 and the substantially V-shaped magnetic path portion 87, the pole teeth 82 side edge 88 of the connecting portion 99 of the core pieces 81 is substantially half a month. A substantially V-shaped hole, a substantially W-shaped hole, a substantially T-shaped hole 90 and the like are formed in a substantially central portion of the connecting portion 99. A perforation 92 such as a substantially round hole or a substantially elliptical hole 91 is formed at the edge 93 of the connecting portion 99 on the side of the yoke portion 85. Provided.
Otherwise, as in the first embodiment, the core materials for lamination are sequentially laminated to form a rod-shaped core, and the rod-shaped core is formed into an annular shape to form a stator core of an electric motor.
[0013]
As described above, various combinations and the like have been described for the preferred embodiments of the present invention. However, the present invention is not limited to the above-described embodiments, and many combinations and modifications are possible without departing from the spirit of the invention. It goes without saying that it is possible to perform such operations.
[0014]
【The invention's effect】
The present invention can provide good strength and low-distortion close contact alignment while moving the iron core material for lamination, preventing obstacles such as material breakage, and maintaining workability that is easy to bend from a band or rod to an annular shape. As a result, there is an effect that the magnetoresistance is reduced and the device has good electro-magnetic characteristics.
[Brief description of the drawings]
FIG. 1 is an enlarged plan view of a main part of FIG. 2;
FIG. 2 is a plan view showing one embodiment of a method of removing a core material for laminating and removing a plate.
FIG. 3 is an enlarged perspective view of a main part of FIG. 4;
FIG. 4 is a perspective view of a rod-shaped iron core body.
FIG. 5 is a plan view of a stator core of a motor in which a rod-shaped core body is formed in an annular shape.
FIG. 6 is an enlarged perspective view of a main part when viewed from the outer diameter side of FIG. 5 and a perspective view of a U-shaped triangular tooth punch of one embodiment.
7 is an enlarged perspective view of a main part when viewed from the inner diameter side in FIG. 5 and a perspective view of a triangular tooth punch of one embodiment.
FIG. 8 is an enlarged perspective view of a connecting portion of the second embodiment.
FIG. 9 is an enlarged perspective view of a connecting portion of the third embodiment.
[Explanation of symbols]
10 and 30: Core material for lamination, 11 and 31: Iron core pieces, 33 and 45: V-shaped notch, 14 and 34: Projection, 12: Polar teeth without V-shaped notch, 25: 12 pressing Part, 32 ... Pole teeth with V-shaped notch 33, 15 and 35 ... Yoke part, 16 and 36 ... Substantially thin magnetic path part, 17 and 37 ... Substantially V-shaped magnetic path part, 18 and 38 ... Pole tooth side Edges, 19 and 39: convex end, 22 and 42: perforation, 23 and 43: yoke side edge, 24 and 44: concave notch, 29 and 49: connecting part, 50: rod-shaped core, 60: electric motor Stator iron core, 70: U-shaped triangular tooth punch, 71: Triangular tooth punch

Claims (1)

From a band-shaped silicon steel sheet, a core material for lamination in which an arbitrary number of core pieces each having pole teeth and a yoke portion are connected is punched, and the core materials for lamination are sequentially laminated to form a rod-shaped core body. In the case where the stator core of the electric motor is formed into an annular shape, the connecting portions of the iron core members are connected so that the iron core members are connected by a substantially thin magnetic path portion and a substantially V-shaped magnetic path portion. At the side edge of the pole teeth, a convex or concave portion such as a substantially semilunar, substantially V-shaped or substantially W-shaped portion is provided, and a substantially arrow-shaped hole, a substantially diamond-shaped hole, a substantially V-shaped hole, A substantially T-shaped hole or the like and a substantially round hole or a substantially elliptical hole continuous with the hole are provided with a substantially semi-lunar, substantially square or substantially V-shaped recess at the side edge of the yoke portion of the connecting portion. An iron core material for laminations characterized by notches.

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