JP5659770B2 - Rotating electric machine core and method of manufacturing rotating electric machine core - Google Patents

Description

  The present invention relates to a core such as a rotor core and a stator core in a rotating electrical machine such as a motor and a method for manufacturing the same.

  Conventionally, a stator core that is a core of a rotating electrical machine is known in which a plurality of divided cores are connected to each other to form an annular shape. When assembling the split cores, each split core is combined into an annular shape, and then a metal ring is heated and thermally expanded, and the thermally expanded ring is fitted to the outer periphery of the split core, so-called shrink fitting Is generally done. The heated ring contracts with heat dissipation and presses the combined divided cores from its outer peripheral surface. As a result, the joint surfaces of the divided cores are brought into close contact with each other (for example, see Patent Document 1).

JP 2009-44803 A

  However, in the above construction method, the thermally expanded ring does not always hold a perfect circle during the contraction process. Therefore, the roundness of the core tends to be low. For this reason, the gap between the rotor and the rotor incorporated in the stator core is not constant, and the characteristics of the motor are likely to deteriorate.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a core of a rotating electrical machine that can improve the characteristics of the rotating electrical machine and a method for manufacturing the core of the rotating electrical machine.

In order to achieve the above-mentioned goal, the invention according to claim 1 is the core of a rotating electrical machine in which a plurality of split cores are connected in an annular shape, and surrounds the outer periphery of each of the connected split cores. A fixing plate having a plurality of connecting portions for fixing the core; and the split core includes a fixing portion fixed to the connecting portion on an outer peripheral surface, and the connecting portions are recessed on an inner surface of the fixing plate. The fixing portion is formed to extend radially outward from the outer peripheral surface of the split core and extend in the axial direction, and the fixing portion and the connecting portion are engaged to form the fixing portion. The gist is to be positioned with respect to the fixed plate.

  Therefore, in the core of the rotating electrical machine of the present invention, the fixed plate is provided with a plurality of connecting portions to which the fixed portions of the split core are fixed. For this reason, a division | segmentation core can be positioned with respect to a fixed board by fixing a fixing | fixed part to a connection part. That is, without using a shrink fitting method that tends to reduce the roundness of the core, the roundness of the core is improved by connecting the split cores positioned with respect to the fixed plate in an annular shape. Rotating electrical machine characteristics can be obtained.

  According to a second aspect of the present invention, in the first aspect, each of the split cores includes a fitting portion corresponding to the joint surface of the adjacent split core in an uneven fitting relationship, and the split cores adjacent to each other. The gist of the invention is that the split cores are positioned by fitting the fitting portions provided on the joint surfaces.

  According to a third aspect of the present invention, in the first or second aspect, the split core includes a plurality of laminated magnetic steel plates, and the fixing plate is a third positioning portion that performs positioning in the stacking direction of the magnetic steel plates. It is summarized as having.

According to a fourth aspect of the present invention, in the core of a rotating electrical machine in which a plurality of divided cores are connected in an annular shape, the core includes a plurality of connecting portions that surround the outer periphery of each of the connected divided cores and fix the divided cores. A fixed plate, and the split core includes a fixed portion fixed to the connecting portion on an outer peripheral surface, and is positioned with respect to the fixed plate by fitting the fixed portion and the connecting portion ; Among these, the gist is that the thickness of the flat plate portion between the connecting portions is thinner than the thickness of the connecting portion.
The invention according to claim 5 is the method for manufacturing a core of a rotating electrical machine according to any one of claims 2 to 4, wherein the fixing portion of the split core is fixed to the connecting portion of the fixing plate. In addition, the gist is that the fitting portion of the split core is fitted into the fitting portion of the adjacent split core, and each side end of the fixing plate is joined to form an annular shape.

  Therefore, in the invention relating to the manufacturing method of the core of the rotating electrical machine, the split cores can be connected to each other in a state where the fixed portion of the split core is fixed to the connecting portion of the fixing plate. In this way, the position accuracy of the split core can be improved. For this reason, the roundness of the inner diameter of the stator core is improved, and good rotating electrical machine characteristics can be obtained.

  As described above, according to the present invention, there is an effect that it is possible to provide a rotating electrical machine core and a rotating electrical machine core manufacturing method that improve the rotating electrical machine characteristics.

The perspective view which shows 1st Embodiment which actualized this invention to the stator core of the motor. The principal part perspective view of the fixing plate of the stator core. The perspective view of the division | segmentation core which comprises the same stator core. The top view of the stator core. The perspective view explaining the process of assembling a split core to a flat fixed plate. The perspective view explaining the state which bent the stationary plate in the process. The top view which shows a part of stator core of another example.

(First embodiment)
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the stator core 10 includes a fixed plate 11 and a split core 20 that are formed in an annular shape, and the stator core 10 includes a plurality of split cores 20 that are connected to each other.

  The fixing plate 11 is formed by punching a flat metal plate or a resin plate into a long shape, and the entire plate is bent during the assembly process of the stator core 10 and the side ends 11a and 11b thereof are bent. As will be described later, it is formed into an annular shape by caulking in a roll shape.

  On the fixed plate 11, connecting portions 12 are formed at equal intervals by press molding. As shown in FIG. 2, the connecting portion 12 is recessed in the inner side surface 11 c that becomes the inner side when the fixing plate 11 is formed into an annular shape, and is formed in a trapezoidal shape in plan view (Z-axis direction in FIG. 3). The plate-shaped fixed plate 11 extends in the height direction (Z-axis direction in FIG. 3), which is the short (width) direction. The connecting portion 12 is provided to position each divided core 20 with respect to the fixed plate 11, and is formed at 12 locations according to the number of the divided cores 20 in this embodiment.

  Further, in the fixed plate 11, the flat plate portion 15 between the connecting portions 12 is processed by press molding or the like so that the thickness T <b> 2 is thinner than the plate thickness T <b> 1 of the connecting portion 12. Thereby, the flat plate part 15 becomes easy to bend, and the whole fixed plate 11 can be easily bent with a curvature close to a perfect circle.

  Moreover, the positioning piece 13 which comprises a 3rd positioning part is formed in the upper end 11d and the lower end 11e of FIG. This positioning piece 13 is provided in each connection part 12, respectively, and in this embodiment, 12 positioning pieces 13 are formed at equal intervals. The positioning piece 13 is punched integrally with the main body of the fixing plate 11 when the fixing plate 11 is punched. When the split core 20 is assembled to the fixed plate 11, as shown in FIG. 1, the positioning piece 13 is directed in the radial direction of the fixed plate 11, that is, toward the center of the circle of the fixed plate 11 formed in an annular shape. It can be bent.

  Further, as shown in FIG. 1, a fastening portion 17 for fixing the stator core 10 to an external member such as an installation portion in the engine room is provided at the upper end 11d of the fixing plate 11 in FIG. The fastening part 17 has a hole 17a for passing a bolt or the like, and in this embodiment, three fastening parts 17 are provided at equal intervals in the circumferential direction of the fixing plate 11.

  Next, the split core 20 will be described. As shown in FIG. 3, the split core 20 is configured by laminating a predetermined number (for example, 200 to 500) of thin plate-like magnetic steel plates P punched into a predetermined shape. Specifically, the split core 20 has a substantially fan-like shape in plan view, and includes a yoke portion 21 and a pair of teeth 22 protruding from the yoke portion 21. A gap is provided between each tooth 22, and each tooth 22 protrudes in a radially inward direction when the divided cores 20 are connected in an annular shape.

  Further, the yoke portion 21 is formed with a first positioning portion 23 as a fixed portion protruding from the outer peripheral surface 20a. The first positioning portion 23 is provided at the center in the circumferential direction on the outer peripheral surface 20 a of the split core 20, and extends parallel to the lamination direction (Z-axis direction) of the magnetic steel plates P. Further, the first positioning portion 23 has a fan shape and is formed in a size and shape that can be fitted into the connecting portion 12 of the fixed plate 11.

  In the split core 20, one side surface 21 a and the other side surface 21 b of the yoke portion 21 are used as a joint surface 20 j with each adjacent split core 20. A second positioning portion 25 is formed on each of the side surfaces 21a and 21b as a fitting portion corresponding to an uneven fitting relationship. The 2nd positioning part 25 formed in the side surface 21a is the fitting recessed part 26 recessed with respect to the side surface 21a. The fitting recess 26 has a rectangular shape in a cross section in a plane parallel to the main surface of the magnetic steel plate P. Further, the upper surface 20b and the bottom surface 20c of the split core 20 are opened and extend in the stacking direction of the magnetic steel plates P.

  The 2nd positioning part 25 formed in the side surface 21b is the fitting protrusion 27 which protruded from the side surface 21b. The cross-sectional shape of the fitting protrusion 27 is rectangular, and the longitudinal direction of the fitting protrusion 27 extends in the direction in which the magnetic steel plates P are laminated. The fitting protrusion 27 is formed in a shape and size that can be fitted into the fitting recess 26.

  As shown in FIG. 4, in a state where each divided core 20 is connected, the fitting recess 26 of the side surface 21 a fits the fitting protrusion 27 of the adjacent divided core 20. Further, the fitting protrusion 27 on the side surface 21 b is fitted into the fitting recess 26 of the adjacent split core 20. In this way, when the divided cores 20 are brought into contact with the entire joining surface and the fitting concave portions 26 and the fitting protrusions 27 are fitted and connected, the twelve divided cores 20 form an annular shape as a whole. Therefore, when connecting the split cores 20, the split cores 20 are displaced inward or outward in the radial direction of the stator core 10 even if a pressing force is received from the adjacent split cores 20 via the joint surfaces 20 j. There is no.

Next, a method for assembling the stator core 10 will be described.
First, as shown in FIG. 5, the inner side surface 11 c of the flat plate-like fixing plate 11 and the outer peripheral surface 20 a of the divided core 20 are opposed to each other, and the first positioning portion 23 of the divided core 20 is connected to the connecting portion 12 of the fixing plate 11. Mating. Thereby, the split core 20 is positioned and fixed with respect to the fixed plate 11. At this time, since the first positioning portion 23 is formed at the center, the split core 20 having the curved outer peripheral surface 20a can be easily positioned with respect to the fixed plate 11.

  After fixing the split core 20 to the fixing plate 11 in this way, as shown in FIG. 6, for example, a jig 50 whose outer shape forms a perfect circle is applied to the tip of the tooth 22 of the split core 20. Then, while bending the flat plate portion 15 of the fixed plate 11 into a circular shape, the joint surfaces 20j of the adjacent divided cores 20 are brought closer to each other. Then, the fitting protrusion 27 is fitted into the fitting recess 26 so that the entire joint surface 20j of each divided core 20 is brought into contact.

  At this time, since the split cores 20 are connected in a state where the split cores 20 are fixed in advance to the fixing plate 11, the split cores 20 are not displaced in the radial direction of the stator core 10, and the split cores 20 can be easily connected to each other. It can be carried out.

  Further, a step of fixing the new divided core 20 to the connecting portion 12 to which the divided core 20 is not fixed while applying the jig 50, and bending a portion of the fixing plate 11 where the divided core 20 is fixed. The annular stator core 10 is manufactured by repeating the process. Alternatively, after the twelve divided cores 20 are fixed to the fixing plate 11, the fixing plate 11 is bent, and the fitting recess 26 and the fitting protrusion 27 of the divided core 20 are connected to contact the joint surface 20j. You may make it make it. Then, the fastening portions 17 are joined to the fixed plate 11 at regular intervals by welding or the like. The fastening portion 17 may be provided in the fixing plate 11 in advance, or may be formed integrally when the flat fixing plate 11 is punched and bent outwardly in the radial direction.

  In this way, the divided cores 20 are coupled, and the twelve divided cores 20 are connected in an annular shape. At this time, as described above, by fitting the fitting recess 26 and the fitting protrusion 27, the split core 20 can be held on the fixing plate 11 and connected while maintaining the positional accuracy of the split core 20. As a result, the inner diameter of the annular split core 20 can be made substantially circular.

  Further, after all the 12 divided cores 20 are connected, or after the divided cores 20 are fixed to the fixing plate 11, the positioning pieces 13 are bent so as to come into contact with the upper surface 20 b and the bottom surface of the divided core 20. That is, since the split core 20 is fixed by the positioning pieces 13 on the upper surface 20b and the bottom surface thereof, it is possible to prevent positional deviation in the stacking direction of the magnetic steel plates P.

According to the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the stator core 10 includes the annular fixing plate 11 that includes a plurality of connecting portions 12 that fix the divided cores 20 and surrounds the outer periphery of each of the divided cores 20 that are connected. The split core 20 is formed on the outer peripheral surface 20 a of the first positioning portion 23 that is fixed to the connecting portion 12 and performs positioning with respect to the fixed plate 11, and is formed on the joint surface 20 j between the adjacent split cores 20. And a second positioning portion 25 that positions the split core 20. The second positioning portion 25 is formed in the fitting recess 26 formed on one joint surface 20j of the split core 20 and the other joint surface 20j of the split core 20 and is fitted in the fitting recess 26 of the adjacent split core 20. It is comprised from the fitting protrusion 27 to match. For this reason, the division | segmentation core 20 can be positioned with respect to the circumferential direction of the stationary plate 11 by fitting with the connection part 12 and the 1st positioning part 23. FIG. Even if the plurality of split cores 20 are connected in an annular shape, the split cores 20 are not displaced in the radial direction of the stator core 10 due to the fitting between the fitting recess 26 and the fitting protrusion 27. For this reason, it is possible to firmly fix between the divided cores 20 and between the divided cores 20 and the fixing plate 11 without using a shrink fitting method in which the roundness of the core tends to decrease. Therefore, the roundness of the inner diameter of the stator core is improved, and good motor characteristics can be obtained.

  (2) In the said embodiment, the split core 20 consists of the some magnetic steel plate P laminated | stacked, and the fixed plate 11 has the positioning piece 13 which positions in the lamination direction of the magnetic steel plate P. As shown in FIG. For this reason, since the positioning can be performed not only in the circumferential direction of the fixed plate 11 but also in the lamination direction of the magnetic steel plates P, the divided core 20 can be firmly fixed to the fixed plate 11.

(3) In the said embodiment, the plate | board thickness of the flat plate part 15 between each connection part 12 among the fixed plates 11 was made thinner than the plate | board thickness of the connection part 12. FIG. For this reason, since the flat plate part 15 can be easily bent, the roundness of the inner diameter of the stator core 10 is easily improved.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

  In the above embodiment, all the split cores 20 are provided with the fitting recesses 26 and the fitting protrusions 27. However, as shown in FIG. 7, each fitting recess 26 is provided on the side surface 21a and the side surface 21b of the yoke portion 21. The stator core 10 may be composed of the split core 20A provided with the respective and the split core 20B provided with the fitting protrusions 27 on the side surface 21a and the side surface 21b. Then, the split cores 20A provided with the fitting recesses 26 and the split cores 20B provided with the fitting protrusions 27 may be alternately arranged to connect the split cores 20A and 20B to each other.

  The number of connecting portions 12 is the same as the number of divided cores 20, but may be larger than the number of divided cores 20. For example, two connecting portions 12 may be provided on the fixed plate 11 for one split core 20, and two first positioning portions 23 may be provided on the outer peripheral surface 20 a of the split core 20.

In the above embodiment, the motor core is embodied as a stator core, but may be embodied as a rotor core having a plurality of divided cores.
The second positioning part 25 of the split core 20 may be omitted.

  -The core of the rotating electrical machine of the present invention may be embodied in a rotor core or stator core of a generator.

P ... Magnetic steel plate, T1, T2 ... Plate thickness, 10 ... Stator core as motor core, 11 ... Fixed plate, 11a, 11b ... Side end, 12 ... Connecting part, 13 ... Positioning piece as third positioning part, 15 ... Flat plate parts, 20, 20A, 20B ... divided core, 20a ... outer peripheral surface, 20j ... bonding surface, the first positioning portion of the 23 ... fixed portion, the second positioning portion as 25 ... fitting portion 26 ... fitting recess, 27: fitting protrusion.

Claims (5)

In a rotating electrical machine core in which a plurality of split cores are connected in an annular shape,
Surrounding the outer periphery of each of the connected divided cores, and comprising a fixing plate having a plurality of connecting parts for fixing the divided cores,
The split core includes a fixed portion fixed to the connecting portion on an outer peripheral surface,
The connecting portion is formed to be recessed in the inner surface of the fixed plate and extend in the axial direction.
The fixing portion is formed so as to protrude radially outward from the outer peripheral surface of the split core and extend in the axial direction.
A core of a rotating electrical machine, wherein the core is positioned with respect to the fixed plate by fitting the fixed portion and the connecting portion.   The split core includes a fitting portion corresponding to an uneven fitting relationship on a joint surface with the adjacent split core, and the fitting portions provided on the joint surfaces of the split cores adjacent to each other are fitted. The core of the rotating electrical machine according to claim 1, wherein the divided cores are positioned by doing so. The split core is composed of a plurality of laminated magnetic steel plates,
The core of the rotating electrical machine according to claim 1, wherein the fixed plate has a positioning portion that performs positioning in the stacking direction of the magnetic steel plates. In a rotating electrical machine core in which a plurality of split cores are connected in an annular shape,
Surrounding the outer periphery of each of the connected divided cores, and comprising a fixing plate having a plurality of connecting parts for fixing the divided cores,
The split core includes a fixing portion fixed to the connecting portion on an outer peripheral surface, and is positioned with respect to the fixing plate by fitting the fixing portion and the connecting portion;
The core of the rotating electrical machine, wherein a plate thickness of the flat plate portion between the connecting portions of the fixed plate is thinner than a plate thickness of the connecting portion. In the manufacturing method of the core of the rotating electrical machine according to any one of claims 2 to 4,
The fixing portion of the split core is fixed to the connecting portion of the fixing plate, the fitting portion of the split core is fitted to the fitting portion of the adjacent split core, and each of the fixing plates A method of manufacturing a core of a rotating electrical machine, characterized in that side ends are joined to form an annular shape.

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