JP4662262B2 - Stator core and method for manufacturing stator core - Google Patents

Description

  The present invention relates to a stator core having a configuration in which a plurality of iron core materials are laminated and a method for manufacturing the stator core.

  Conventionally, a method of forming a stator core by punching a thin electromagnetic steel plate into an annular shape to obtain an iron core material and laminating them is known. Since such a stator core is composed of a laminated body in which the iron core materials are laminated as described above, the iron core materials are easily separated from each other. Accordingly, it is necessary to temporarily fix the iron core materials until the coils are housed or wound around the stator iron core and fixed to the case.

Therefore, conventionally, as shown in FIG. 11, the temporary fixing is performed by, for example, welding the outer periphery of the stator core 100 with a laser or the like at several points in the stacking direction (see the welded portion 101 in FIG. 11). Yes. Then, the bolt 104 is inserted into the bolt hole 103 formed in the ear portion 102 protruding from the outer periphery of the stator core 100 and then tightened with the nut 105 to reliably prevent the stator core 100 from being scattered, The stator core 100 is fixed to a case (not shown).
Patent Document 1 also discloses a similar configuration in which a core material is welded using a laser.
Japanese Patent Laid-Open No. 08-149726 (refer to paragraph number “0021” and FIG. 1 in particular)

  Here, the above configuration has the following problems. That is, if the stator core 100 is welded at the time of temporary fixing, the welded portion 101 is distorted due to the influence of heat at the time of welding, and a slight dimensional change occurs. There was also a problem that iron loss increased by welding.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stator core and a method for manufacturing the stator core that can reduce dimensional changes and prevent an increase in iron loss. .

In order to achieve the above object, a stator core according to the present invention includes a laminate formed by laminating a plurality of core materials having through holes, and the core materials are inserted into the through holes and expanded. A bundling cylinder for bundling is provided, and pins that are orthogonal to the bundling cylinder are press-fitted into both ends of the bundling cylinder that protrude from the laminated body. invention).
In the above case, the manufacturing method includes forming a plurality of through holes in the iron core material, laminating the iron core materials to obtain a laminated body, and then making the laminated body smaller than an inner diameter of the through hole. A bundling cylinder that penetrates the bundling cylinder, press-fitting the insertion body into the bundling cylinder, and radially expanding the inner diameter of the bundling cylinder so that the outer circumferential surface of the bundling cylinder is the inner circumferential surface of the through hole It is preferable that the iron core members are bound together by press-fitting pins at both ends protruding from the laminated body of the binding cylinder so as to be orthogonal to the binding cylinder (invention of claim 6 ). .

  According to such a configuration and manufacturing method of the stator core, the core materials constituting the laminated body can be bound without being welded. Therefore, it is possible to prevent problems such as distortion of the laminate (stator core) due to welding.

  As described above, according to the stator core of the present invention, it is possible to obtain an excellent effect that dimensional change can be reduced and an increase in iron loss can be prevented.

Hereinafter, a first reference example in which the present invention is applied to a stator of a rotating electrical machine will be described with reference to FIGS.
First, FIG. 2 shows a front view of the iron core material 1. As shown in this figure, the iron core material 1 is formed in a substantially annular shape as a whole by punching out an electromagnetic steel sheet. A plurality of slots 2 are formed on the inner peripheral side of the iron core material 1, and a plurality of through holes 3 and bolt holes 4 are formed in the vicinity of the outer peripheral side. A total of nine through-holes 3 are formed over the entire circumference, and a total of 18 bolt holes 4 are formed on both sides of the through-hole 3. A plurality of the iron core materials 1 are laminated to form a cylindrical shape. At this time, the through hole 3 and the bolt hole 4 are configured so as to be aligned in the axial direction, whereby the laminated body 5 (FIG. ))).

  Next, with reference to FIG. 3, a process of inserting and expanding the bundling cylinder 6 having a circular cross section in the through hole 3 of the laminate 5 will be described. First, the bundled cylinder 6 is inserted into the through-holes 3 (9 places in total) that are aligned in the axial direction and have a cylindrical shape. As shown in FIG. 3A, the outer diameter dimension of the binding cylinder 6 is smaller than the inner diameter dimension of the through hole 3 and both end portions thereof are the through holes 3 (in other words, the upper and lower ends in FIG. It protrudes from the iron core material 1).

  In this state, as shown in FIG. 3 (b), the punch 7, which is an insert, is press-fitted into the bundled cylinder 6. In this punch 7, the tip end portion 7 a has a tapered shape, and the maximum outer diameter portion (so-called parallel portion) 7 b expands the binding cylinder body 6 so that the outer peripheral surface of the binding cylinder body 6 is formed in the through hole 3. It is formed in a size that can be fitted to the inner peripheral surface. Therefore, when the punch 7 is gradually press-fitted into the binding cylinder 6 from the state shown in FIG. 3A (the state shown in FIG. 1B), the outer peripheral surface of the binding cylinder 6 becomes the inner periphery of the through-hole 3. It is gradually mated to the surface. Eventually, as shown in FIG. 3C, when the punch 7 passes through the through hole 3, the entire outer peripheral surface of the bundling cylinder 6 is brought into pressure contact with the inner peripheral surface of the through hole 3. The stator cores 8 are formed by binding, that is, temporarily fixing the plurality of constituent iron core materials 1 so as not to be separated from each other.

  At this time, as shown in FIG. 4 (only one end portion is shown in FIG. 4), both end portions protruding from the laminated body 5 of the bundling cylindrical body 6 are expanded in the radial direction to form a retaining portion 6a. Then, the retaining portion 6a is crushed with a plate-like punch (not shown) to form a crushed portion 9 in the portion, thereby preventing the core material 1 at both ends constituting the laminate 5 from being peeled off. In addition, the entire plurality of iron core members 1 are securely bound.

As shown in FIG. 1, a coil 10 is wound around the slot 2 of the stator core 8 to form a stator 11, which is housed in a case 12 having a substantially cylindrical shape. At this time, since the end of the bundled cylinder 6 fitted in the through hole 3 of the laminate 5 protrudes from the laminate 5, the end of the laminate 5 in the stator attachment portion 12 a of the case 12. A counterbore (so-called hole) 12b that allows the end of the bundling cylinder 6 to escape is formed at a portion that contacts the end surface. The stator 11 housed in the case 12 is inserted into the bolt hole 4 with a bolt 13 (only one is shown in FIG. It is fixed to the case 12.
Although not shown, a rotor is disposed in the stator 11, and bearing brackets having bearings for supporting the rotor shaft of the rotor are disposed at both ends of the case 12, and thus, A rotating electric machine is configured.

According to the first reference example as described above, when the iron core materials 1 constituting the laminated body 5 are temporarily fixed together, instead of welding, the bundling cylinder 6 is inserted into the through-hole 3, The outer peripheral surface of the bundling cylinder 6 is bonded to the inner peripheral surface of the through hole 3 by pressing. For this reason, the dimensional change and magnetic resistance (iron loss) of the iron core material 1 and, in turn, the stator iron core 8 can be significantly suppressed, and thereby the characteristics of the rotating electrical machine can be improved.
Further, since the through hole 3 is formed in the vicinity of the outer peripheral side of the iron core material 1, the outer peripheral surface of the stator iron core 8 becomes flush and the accuracy of the outer diameter of the stator iron core 8 can be improved.

Next, a second reference example of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the location similar to the said 1st reference example, and the detailed description is abbreviate | omitted.
As shown in FIG. 5 (only one end portion is shown in FIG. 5), a retaining portion 20 having a curled cross section is formed at both ends protruding from the laminated body 5 of the binding cylinder 6. The leading end of the retaining portion 20 comes into contact with the iron core material 1 at both ends of the laminated body 5, thereby preventing the peeling of the iron core material 1 at both ends more reliably.

Next, a third reference example of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the location similar to the said 1st reference example, and the detailed description is abbreviate | omitted.
Concave portions 30 and convex portions 31 are formed alternately on the outer peripheral surface of the binding cylinder 6 so as to be uneven along the length direction. Moreover, the through-hole 3 of the iron core material 1 which comprises the laminated body 5 has the small diameter hole 32 with respect to the recessed part 30, and the large diameter with respect to a convex part so that it may each correspond to the recessed part 30 and the convex part 31 of the said binding cylinder 6. Holes 33 are formed, and these are alternately stacked. As a result, the same effects as those of the first reference example can be obtained, and a situation in which the binding cylinder 6 is pulled out for some reason and the binding force is reduced can be prevented.

Next, an embodiment of the present invention with reference to FIG. In addition, the same code | symbol is attached | subjected to the location similar to the said 1st reference example, and the detailed description is abbreviate | omitted.
Instead of the retaining portion, an insertion hole 40 penetrating the binding cylinder 6 is formed at both ends of the binding tube 6 protruding from the laminated body 5, and a retaining pin 41 (pin) is formed in the insertion hole 40. Is press-fitted and fixed so as to be orthogonal to the bundling cylinder 6. When the retaining pin 41 is press-fitted and fixed in the insertion hole 40, both end portions thereof come into contact with the surface of the iron core material 1 at both ends constituting the laminated body 5, thereby peeling off the iron core material 1 at both ends. Can be prevented. Even in such a configuration, the same effect as that of the first reference example can be obtained, and the work efficiency can be improved because only the retaining pin 41 is press-fitted.

Next, a fourth reference example of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the location similar to the said 1st reference example, and the detailed description is abbreviate | omitted.
As shown in FIG. 8A, the bundled cylinder 6 inserted into the through hole 3 of the laminate 5 is expanded only at the portions corresponding to both end portions in the laminate direction (vertical direction in the figure) of the laminate 5. It is open (refer to the expansion part 6b), and the part corresponding to the center part of the laminated body 5 in the stacking direction (vertical direction in the figure) is not expanded (refer to the non-expansion part 6c). In this case, the outer peripheral surface of the expanded portion 6 b at both upper and lower end portions is in pressure contact with the inner peripheral surface of the through hole 3, but the outer peripheral surface of the non-expanded portion 6 c is in contact with the inner peripheral surface of the through hole 3. Absent. At both ends of the binding cylinder 6 protruding from the laminated body 5, caulking portions 45 that are pushed and bent outward are formed at a plurality of locations, and the caulking portions 45 are iron core members at both ends constituting the laminated body 5. 1 is in contact with the surface. Thereby, peeling of the iron core material 1 of the both ends which comprise the laminated body 5 is prevented, and the several iron core material 1 whole is bound reliably.

  Here, in order to form the expansion part 6b only in the both ends of the binding cylinder 6, it carries out as follows, for example. As shown in FIG. 9, the punch 7 constituting the insertion body is formed at one end portion (upper end portion in the drawing) of the binding cylinder body 6 with the binding cylinder body 6 inserted in the through hole 3 of the laminated body 5 in a penetrating state. And the widened portion 6b is formed by expanding only the upper end portion side of the bundled cylindrical body 6 by the maximum outer shape portion 7b. At this time, the punch 7 is inserted only from the upper end in the stacking direction of the stacked body 5 to a portion corresponding to a little downward. Then, after the punch 7 is pulled out, a caulking portion 45 is formed at the upper end portion protruding from the laminated body 5 of the binding cylinder 6. Thereafter, the laminated body 5 is turned upside down, and the expanded portion 6b and the caulking portion 45 are formed in the other end portion of the bundled cylinder 6 in the same manner as described above.

  In addition, as a method for forming the expanded portions 6 b at the upper and lower ends of the binding cylinder 6, the punches 7 are arranged on both the upper and lower sides of the laminated body 5, and the upper and lower punches 7 are arranged at the upper and lower ends of the binding cylinder 6. It is also possible to press-fit at the same time to form the expanded portions 6 b at both ends of the binding cylinder 6 at the same time.

In such a reference example , in the binding cylinder 6, the non-expanded portion 6 c corresponding to the central portion in the stacking direction of the stacked body 5 is not pressed against the stacked body 5. Deformation of the iron core material 1 located in the central portion in the stacking direction can be suppressed. Therefore, there is an advantage that deformation of the iron core material 1 can be reduced as compared with the case where the entire length of the bundling cylinder 6 is expanded.

In addition, in the shape of a binding cylinder, various things may be employ | adopted according to a use. That is, for example, as shown in FIG. 10A, when the bundling cylinder 50 having a C-shaped cross section is used, the bundling cylinder 50 is smoothly expanded when the punch 7 is expanded. As shown in FIG. 10B, when the bundling cylinder 61 is provided with a plurality of ridges 60 on the outer peripheral surface, the ridges 60 are tightly pressed against the inner peripheral surface of the through-hole 3 during the expansion (surface pressure). As a result, the binding between the iron core materials 1 can be strengthened.
Also, as shown in FIG. 10 (c), the outer peripheral surface is a bundling cylinder 71 having a knurling 70, or as shown in FIG. 10 (d), the outer peripheral surface is a polygon (in this case, an octagon). Even if it is set as the bundling cylinder 80, it is possible to obtain the above effect (increase the surface pressure).

In addition, in the said one Example and the 1st-4th reference example, although the total 9 through-holes 3 and 18 bolt holes 4 were formed with respect to the iron core material 1, the number of these holes formed is It can be changed as appropriate according to the state of use and strength.
Further, when the iron core material 1 is laminated to form the laminated body 5, a thick plate (end plate) or a washer is applied to the iron core material 1 at both ends, and these are fixed to the case 12 together. Good. Further, the bolt 13 may be inserted into the bundling cylinder 6 and fixed to the case 12.
Moreover, the shape of the binding cylinder 6 is not limited to the above-described modified example, and is not particularly limited as long as the iron core materials 1 can be bound.
Moreover, it is good also as a structure which forms an ear | edge part (not shown) in the iron core material 1, and inserts the binding cylinder 6 in this ear | edge part.

Sectional drawing which shows the 1st reference example of this invention, and shows the state which incorporated the stator core in the case Front view of iron core material (A)-(c) Process drawing which expands a binding cylinder (A) is an enlarged cross-sectional view of one end of a bundled cylinder, and (b) is a front view of the same. FIG. 4 equivalent view showing a second reference example of the present invention FIG. 4 equivalent view showing a third reference example of the present invention FIG. 4 equivalent view showing an embodiment of the present invention The 4th reference example of this invention is shown, (a) is a longitudinal cross-sectional view of the principal part, (b) is a front view. Longitudinal cross-sectional view of the main part showing the step of expanding one end of the binding cylinder (A)-(d) is a perspective view which shows the modification of a binding cylinder. Shows a conventional example, side view of the entire stator core

Explanation of symbols

  In the drawings, 1 is an iron core material, 3 is a through hole, 5 is a laminated body, 6 is a bundled cylinder, 6a is a retaining portion, 7 is a punch (insert), 8 is a stator core, 9 is a crushing portion, and 20 is The retaining portion, 41 is a retaining pin (pin), 45 is a caulking portion, and 50, 61, 71, and 80 are bundling cylinders.

Claims (6)

A laminate formed by laminating a plurality of iron core materials having through holes;
A bundling cylinder for bundling the iron core materials by being inserted into the through-hole and expanded,
A stator core, wherein pins that are orthogonal to the bundling cylinder are press-fitted at both ends of the bundling cylinder that protrude from the laminated body. In the binding cylinder, portions corresponding to both end portions in the stacking direction of the stacked body are expanded, and portions corresponding to the center portion in the stacking direction of the stacked body are not expanded. The stator core according to claim 1 . The stator core according to claim 1 or 2, wherein the binding cylinder has a circular cross section . The stator core according to claim 1 or 2, wherein the binding cylinder has a C-shaped cross section. The stator core according to claim 1 or 2, wherein the binding cylinder has a polygonal cross section. In the method of manufacturing a stator core including a laminate formed by laminating a plurality of iron core materials,
A plurality of through-holes are formed in the iron core material, and a laminated body is obtained by laminating the iron core materials, and then a bundling cylinder that is smaller than the inner diameter of the through-hole and penetrates the laminated body is inserted into the through-hole. The insertion cylinder is press-fitted into the binding cylinder so that the inner diameter of the binding cylinder is expanded in the radial direction so that the outer peripheral surface of the binding cylinder is pressed against the inner peripheral surface of the through-hole. A method of manufacturing a stator core, characterized in that the core members are bound together by press-fitting pins at both ends protruding from the laminated body at right angles to the binding cylinder.

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