JP5130196B2 - Motor core - Google Patents

Description

  The present invention relates to a motor core, and more particularly to a motor core in which steel plates are laminated and fixed integrally by welding.

  A stator or a rotor of a rotating electrical machine is formed by punching electromagnetic steel sheets into a predetermined shape, stacking them, and integrating them by caulking, welding, or the like.

  For example, in Patent Document 1, as a stator of a rotating electric machine, a plurality of laminated blocks obtained by laminating a plurality of steel plates and caulking and fixing in a laminating direction are inclined in the same direction with the return due to punching being biased in the same direction. In order to prevent lamination in a shape, it is described that rolling is performed by turning at a certain angle, and thereafter, the surface of the side surface is line welded or spot welded in the lamination direction.

  Further, in Patent Document 2, when a motor core punched out by press working is laminated and fixed as a motor core by laser welding, a relief portion is punched out in advance in a portion where laser welding is performed, and the projection by welding protrudes from the front surface of the core. It is disclosed to prevent this.

  Further, in Patent Document 3, in a stepping motor having a stator core or the like, the magnetic characteristics of a plurality of laminated thin steel plates are not changed by laser welding performed to integrate a plurality of thin steel plates forming the stator core. It is stated that it takes place in position. Specifically, laser welding is performed at a single or a plurality of predetermined positions on the outer peripheral surface of the stator core.

  Further, Patent Document 4 discloses that a weld iron core having excellent iron loss characteristics has a residual stress of −200 MPa or less (− is a compressive stress, + is a tensile stress) at a portion 1 mm away from a welded portion. Yes.

JP 2007-159300 A JP 2000-209792 A JP 2002-209345 A JP 2002-313623 A

  Thus, the motor core is formed by laminating a plurality of plates made of electromagnetic steel plates. As described in Patent Document 1, when a plurality of laminated blocks are once formed, the laminated blocks are rolled, and the outer periphery is welded, welding is reliably performed between the laminated blocks. It is necessary to check whether or not.

  Since each laminated block is a laminated body of plates of the same shape, the same thickness and the same material, when the laminated blocks are stacked, the boundary is hardly distinguishable visually. That is, it is difficult to confirm whether or not welding has been performed across adjacent laminated blocks.

  Therefore, in order to confirm whether welding is performed reliably between adjacent laminated blocks, after welding, an inspection operation is performed in which each laminated block is manually lifted by an operator. That is, if a plurality of stacked laminated blocks are lifted together, it is determined that welding is sufficiently performed between adjacent stacked blocks, and if separated between the stacked blocks, it is determined that welding is insufficient. The As described above, since the welding between the laminated blocks cannot be visually confirmed, it is necessary to lift the laminated blocks one by one, which requires man-hours.

  An object of the present invention is to provide a motor core that makes it possible to visually determine whether or not a welding operation has been appropriately performed when stacking laminated blocks and integrally fixing them by welding.

  The motor core according to the present invention is formed by stacking laminated blocks formed by laminating a plurality of shaped steel plates processed into a predetermined shape, and mutually laminated blocks at the position of a preset welding groove on the outer periphery thereof. Each laminated block is formed by laminating shaped steel plates having weld grooves having the same groove contour shape on the outer peripheral surface, and each laminated block stacked adjacently. Is characterized by having weld grooves having different groove contour shapes on the outer peripheral surface.

  Further, in the motor core according to the present invention, each shaped steel plate has a semicircular weld groove having a preset radius R in a planar shape, and each of the stacked blocks stacked adjacent to each other has a radius R. It is preferable to distinguish by having different weld grooves.

  Further, in the motor core according to the present invention, each shaped steel plate has a welding groove including a semicircular shape having a preset radius R in a planar shape, and a notch portion that can be further added to the semicircular shape, Each of the stacked blocks stacked adjacent to each other is preferably distinguished by the presence or absence of an attachable notch with the same radius R, or by being different in the arrangement position of the notch in the semicircular shape.

  Further, in the motor core according to the present invention, the respective stacked blocks are rotated with each other at a rolling angle set by dividing an angle of 360 degrees around a central axis parallel to the stacking direction by a predetermined integer of 2 or more. In this case, the stacking is preferably performed so that the positions of the welding grooves on the outer periphery are the same between the adjacent stacked blocks.

  Further, in the motor core according to the present invention, each shaped steel plate has a plurality of weld grooves arranged on the outer peripheral surface at every rolling angle around a central axis parallel to the stacking direction, and a plurality of shaped steel plates in each shaped steel plate The weld grooves preferably have different groove contour shapes on the outer peripheral surface.

  With the configuration described above, the motor core is integrally fixed by stacking stacked blocks formed by stacking a plurality of shaped steel plates, and welding the stacked blocks to each other at predetermined welding groove locations on the outer periphery thereof. Each laminated block is formed by laminating shaped steel plates having weld grooves having the same groove contour shape on the outer peripheral surface, and the laminated blocks stacked adjacently have different groove contour shapes on the outer peripheral surface. Has a weld groove. Thereby, even if the laminated blocks are stacked in a plurality of stages, the groove contour shapes of the weld grooves are different from each other between the adjacent laminated blocks, so that the boundary between the adjacent laminated blocks can be visually identified, It is possible to visually determine whether welding is performed across the boundary.

  Further, in the motor core, each shaped steel plate has a semicircular weld groove having a preset radius R in a planar shape, and each of the stacked blocks stacked adjacent to each other has a radius R different from each other. Has a groove. As a result, between adjacent laminated blocks, the groove contour shapes of the weld grooves are different from each other on the outer peripheral surface, and the boundary between adjacent laminated blocks can be identified visually, and welding is performed across the boundary. It is possible to visually determine whether or not.

  In the motor core, each shaped steel plate has a welding groove including a semicircular shape having a preset radius R in a planar shape and a notch that can be further added to the semicircular shape, and is stacked adjacent to each other. Each of the stacked blocks is distinguished by the presence or absence of an addable notch with the same radius R, or by the arrangement position of the notch in the semicircular shape. As a result, the groove contour shape of the weld groove on the outer peripheral surface differs between the adjacent laminated blocks depending on the presence or absence of the notch portion or the arrangement position thereof, so that the boundary between the adjacent laminated blocks can be visually identified. It is possible to visually determine whether or not welding is performed across the boundary.

  Further, in the motor core, each laminated block is stacked by rotating each other at a rolling angle set by dividing an angle of 360 degrees around a central axis parallel to the lamination direction by a predetermined integer of 2 or more, In that case, it piles up so that the position of the welding groove in an outer periphery may become the same between adjacent laminated blocks. Even when so-called inversion is performed between adjacent laminated blocks, the groove contour shape of the weld groove differs between the adjacent laminated blocks on the outer peripheral surface, and the boundary between adjacent laminated blocks can be visually identified. Thus, it is possible to visually determine whether or not welding is performed across the boundary.

  Further, in the motor core, each shaped steel plate has a plurality of weld grooves arranged on the outer peripheral surface at every rolling angle around a central axis parallel to the stacking direction, and the plurality of weld grooves in each shaped steel plate are: The groove contour shapes on the outer peripheral surface are different from each other. Thereby, using a shaped steel plate of the same shape, this is laminated to form a plurality of laminated blocks, and if this is rolled at a rolling angle, between adjacent laminated blocks, welding grooves are formed on the outer peripheral surface. The groove contour shapes are different from each other. Therefore, while using the shaped steel plate of the same shape, between adjacent laminated blocks, the groove contour shape of the weld groove on the outer peripheral surface is different from each other, so that the boundary between adjacent laminated blocks can be visually identified, It is possible to visually determine whether or not welding is performed across the boundary.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a stator core will be described as a motor core, but a rotor core in which a plurality of laminated blocks are integrated by welding may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating a configuration of a stator core 10 that constitutes a rotating electrical machine. The stator core 10 is formed by stacking laminated blocks 14, 16, and 18 formed by laminating a plurality of shaped steel plates 12 processed into a predetermined shape, and a predetermined location of a welding groove 30 on the outer periphery thereof. In this case, the laminated blocks 14, 16 and 18 are welded and fixed integrally. FIG. 1 shows a state in which the weld bead 20 is formed between the adjacent laminated blocks 18 and 14 and between the laminated blocks 14 and 16.

  The shaped steel plate 12 is a magnetic plate formed by punching a thin electromagnetic steel plate into a planar shape of the stator core 10 by press working so as to obtain a predetermined thickness of the stator core 10. The planar shape of the shaped steel plate 12 has a circular shape corresponding to the outer peripheral shape of the stator core 10, and a plurality of comb-like shape portions 11 corresponding to the coil winding teeth in the stator core 10 are provided on the inner diameter side thereof. A mounting portion 13 including a mounting hole is provided on the outer peripheral side. Further, three welding grooves 30 are provided on the outer periphery. In FIG. 1, three locations on the outer periphery where the welding groove 30 is provided are indicated by A, B, and C.

  In FIG. 1, the comb-teeth-shaped portion 11 has a repetitive shape, so only a part thereof is illustrated, and the welding groove 30 is not illustrated in a laminated state of each shaped steel plate 12. . Also in each of the following drawings, detailed illustration of the comb-shaped portion 11 and illustration of the laminated state of the shaped steel plate 12 will be omitted as necessary.

  The laminated blocks 14, 16, and 18 are subassembly products in which a plurality of plates that are shaped steel plates 12 are laminated and integrated by a caulking method. In the lamination integration, positioning is performed so that the shapes of the respective shaped steel plates coincide.

  The number of laminations is set according to the specifications of the stator core 10, but as an example, 75 shaped steel plates can be laminated as the stator core 10. In this case, each of the laminated blocks 14, 16, 18 can be laminated with 25 shaped steel plates.

  The welding groove 30 provided in the outer peripheral surface of each lamination | stacking block 14,16,18 is a groove | channel used for welding for integrating between adjacent lamination | stacking blocks. The weld groove 30 is a concave portion that is recessed in advance from the cylindrical shape toward the inner diameter side so that the weld bead 20 generated by welding does not jump out of the outer cylindrical shape of the laminated blocks 14, 16, and 18.

  The weld groove 30 has a function as a dent used for welding and a function of showing a boundary between adjacent stacked blocks in each of the stacked blocks 14, 16, and 18. This function will be described with reference to FIGS.

  Each of the laminated blocks 14, 16, and 18 is obtained by laminating the shaped steel plates 12 as described above. However, when the shaped steel plates 12 are laminated as they are, the laminated height is locally increased due to return, warpage, or the like in press working. Can be biased. Therefore, so-called transversion is performed.

  Rolling is performed between rolling blocks 14, 16, and 18 at a rolling angle set by dividing an angle of 360 degrees around a central axis parallel to the stacking direction by a predetermined integer of 2 or more. Rotating and stacking. The rolling angle can be arbitrarily set according to the outer shape of the stator core 10 as long as it is an angle obtained by dividing 360 degrees by an integer. In the case of FIG. 1, since the three attachment portions 13 are provided, the rotation angle is preferably 120 degrees so that the attachment portions 13 overlap each other by rotating at the rolling angle. . At this time, since the comb-shaped portion 11 on the inner diameter side also needs to be overlapped by rolling, it is necessary to set the number of comb teeth to be a multiple of three.

  As described above, the roll angle is set to 120 degrees in the example of FIG. 1, so that the weld grooves 30 are also arranged on the outer periphery of each shaped steel sheet 12 every 120 degrees. At this time, the welding grooves 30 provided at three locations are formed such that the groove contour shapes on the outer peripheral surface are different from each other. Each of the laminated blocks 14, 16, and 18 is formed by laminating the shaped steel plates 12 so that three types of welding grooves 30 having different groove contour shapes overlap each other. That is, also in each of the laminated blocks 14, 16, and 18, three types of weld grooves 30 are arranged on the outer periphery every 120 degrees.

  When each of the laminated blocks 14, 16, 18 is transposed at a transposition angle of 120 degrees between them, the outer peripheral surface of each of the laminated blocks 14, 16, 18 at three places where the weld grooves 30 are arranged. The groove contour shapes of the weld grooves 30 in FIG. This is shown in FIG. FIG. 2 is a view of A, B, and C, which are three locations on the outer peripheral surface of the stator core 10 on the outer periphery where the welding grooves 30 are provided. In addition, the boundary of each shaped steel plate 12 is abbreviate | omitting illustration.

  As described above, the shapes of the three types of weld grooves 30 are set such that the groove contour shapes on the outer peripheral surface are different from each other. Specifically, since the welding groove 30 is a concave portion provided on the outer periphery and recessed toward the inner peripheral side, the passing dimension of the concave portion on the outer peripheral surface is set to be different. The difference in the passing dimension is set to such an extent that the three types of welding grooves 30 can be visually distinguished from each other. Empirically, if there is a difference in passing dimension of about 1 mm, the difference can be identified visually. Accordingly, it is preferable that the groove contour shapes on the outer peripheral surfaces of the three types of welding grooves 30 are set so that the difference in the passing dimension of the recesses on the outer peripheral surface is about 1 mm.

  Referring to FIG. 2, the state of the portion A illustrated on the front side in FIG. 1 will be described. The three laminated blocks 14, 16, and 18 have the laminated block 14 arranged at the center and the laminated block below the three laminated blocks 14, 16 and 18. 16 is arranged, and the laminated block 18 is arranged on the top. And since the passing dimension of the recessed part in the outer peripheral surface of the welding groove 32 of the lamination | stacking block 14 is the largest, it will call this L. The next largest dimension of the recesses on the outer peripheral surface is the weld groove 34 of the lowermost layered block 16, which is referred to as M. Since the welding dimension of the uppermost laminated block 18 has the smallest recess dimension on the outer peripheral surface, it will be referred to as S.

  As described above, when the three types of welding grooves 32, 34, and 36 are referred to as L, M, and S, respectively, in the portion A illustrated on the near side in FIG. 1, from the upper side toward the lower side. , S, L, M. Similarly, in the location of B arranged on the right back side in FIG. 1, it is arranged in order of L, M, S from the upper side to the lower side, and the location of C arranged on the left back side in FIG. Then, they are arranged in the order of M, S, and L from the upper side to the lower side.

  That is, in any of the three locations A, B, and C, when the laminated blocks 14, 16, and 18 are rolled and stacked, the shape of the weld groove is different between adjacent laminated blocks. The difference is that in the above example, the passing dimension of the concave portion on the outer peripheral surface is different, and the difference is about 1 mm or about 2 mm. Accordingly, in each of the stacked blocks 16, 14, and 18 stacked from the lower side to the upper side, a difference in the outer shape of the weld groove clearly appears between the adjacent stacked blocks. Can be recognized.

  Thus, the laminated grooves 14, 16, and 18 are rolled up by making the groove contour shape in an outer peripheral surface mutually differ for the welding groove 30 provided in the outer peripheral surface of each shaped steel plate 12 at 120 degree | times. When stacked, the boundary between the stacked blocks adjacent to each other is clearly shown in the outer shape of the weld groove. That is, the welding groove 30 has a function as a dent used for welding, and also has a function of showing a boundary between adjacent laminated blocks in each laminated block 14, 16, 18.

  The reference convex portion 22 provided in each of the welding grooves 32, 34, and 36 is a convex bulge that serves as a mark indicating a portion to be welded. The reference convex portion 22 is provided in the central portion of the welding grooves 32, 34, and 36 in parallel with the stacking direction. Therefore, the welding of the adjacent laminated blocks includes a boundary line that runs perpendicular to the laminating direction expressed by two weld grooves whose groove contour shapes are different from each other, and a guide protrusion that runs parallel to the laminating direction at the center of each weld groove The work can be performed with the intersection point where the point 22 intersects the target position. 1 and 2 show a weld bead 20 formed by the welding operation positioned in this manner.

  FIG. 3 is a view showing a state of a surface perpendicular to the stacking direction of the three types of weld grooves 32, 34, 36, that is, a plan view of the shaped steel plate 12. Here, the cross-sectional views of the three types of weld grooves 34, 32, and 36 are shown on the same scale according to the stacking order of the stacked blocks 16, 14, and 18 in FIG. Each of the weld grooves 34, 32, and 36 is a hollow shape that is a combination of two semicircular shapes having a radius R, and the two intersecting portions of the semicircular shapes protrude to the outer peripheral side to form the weld bead 20. The reference convex portion 22 is formed.

In FIG. 2A, the welding groove 36 of the uppermost laminated block 18 is S, and the passing dimension of the concave portion on the outer peripheral surface is the smallest. Correspondingly, the semicircular radius R _S is set to the smallest value. The welding groove 32 of the central laminated block 14 is L, and the passing dimension of the concave portion on the outer peripheral surface is the largest. Correspondingly, the semicircular radius _RL is set to the largest value. Moreover, the welding groove 34 of the lowermost laminated block 16 is M, and the passing dimension of the concave portion on the outer peripheral surface is an intermediate value. Correspondingly, the semicircular radius R _M is set smaller than R _{L and} larger than R _S. That is, R _L > R _M > R _S is set.

  Next, a manufacturing procedure of the stator core 10 having the above configuration will be described with reference to FIGS. FIG. 4 is a flowchart showing the manufacturing procedure of the stator core 10, and FIG. 5 is a diagram for explaining the state of each procedure corresponding to FIG. 4.

  First, the electromagnetic steel sheet is punched (S10). Specifically, the shaped steel sheet 12 is punched out by pressing into a predetermined shape corresponding to the outer shape of the stator core 10 using a press die using a sheet of an electromagnetic steel sheet having an appropriate thickness and width as a raw material. The shaped steel plate 12 punched out is called a plate (S12).

  FIG. 5 is a diagram schematically showing how the shaped steel sheet 12 is punched out of the electromagnetic steel sheet 8 using a mold. In this way, the shaped steel plate 12 has a circular outer shape having a comb-tooth-shaped portion 11 on the inner diameter side and an attachment portion 13 on the outer peripheral side, and further, L, M, and S at three locations on the outer periphery. Three types of welding grooves are provided. L, M, and S correspond to the welding grooves 32, 34, and 36 described in FIG.

  Next, an appropriate number of shaped steel plates 12 are laminated with shapes matched to each other, and integrally formed by a caulking method (S14). A plurality of shaped steel plates 12 that are caulked and laminated are laminated blocks (S16). In FIG. 5, the laminated block 14 is shown. In the above example, 25 shaped steel plates 12 are caulked and laminated blocks 14 are formed.

  Next, the position of the welding groove is aligned and the transposition is performed (S18). In the transversion, one of the laminated blocks 14 obtained in S16 is left as it is, and one is a state in which the laminated block 14 is rotated clockwise by 120 degrees around the central axis parallel to the lamination direction. The other is to prepare three types of laminated blocks in a state in which the laminated block 14 is rotated counterclockwise by 120 degrees around the central axis. These three types of laminated blocks differ in phase by 120 degrees with respect to the arrangement of the weld grooves around the central axis. And these three types of laminated blocks are stacked with the positions of the welding grooves aligned.

  FIG. 5 shows the state of three types of laminated blocks 16, 14, and 18 having different phases and the state of the stator core before welding in which these are stacked. As shown in the state of the stator core before welding, in the stacked laminated blocks, the boundary between the adjacent laminated blocks can be clearly identified by the difference in the groove contour shape on the outer peripheral surface.

  And as FIG. 4 shows, welding is performed (S20) and the stator core 10 is formed (S22). As described above, the welding is performed by using the reference convex portion 22 and the boundary line running perpendicular to the stacking direction represented by two weld grooves having different groove contour shapes and the center of each weld groove in the stacking direction. The intersection point where the reference convex portion 22 running in parallel intersects is set as the target position. This target position can also be recognized visually, and of course, if the welding apparatus has a visual sensor, positioning can be performed automatically.

  In the above description, three types of welding grooves 32, 34, and 36 are provided in each shaped steel plate 12. Since the difference in the shape of the weld groove is for showing the boundary when the adjacent laminated blocks are stacked, two kinds of weld grooves are sufficient in principle.

  Therefore, when rolling is performed at a rolling angle obtained by dividing 360 degrees by an even integer, two types of weld grooves having different shapes can be provided in each shaped steel plate. The two types of weld grooves may be different in shape from each other between adjacent weld grooves arranged along the outer periphery.

  Moreover, the shape of the welding groove | channel of each shaped steel plate can be made mutually different using two or more types of shaped steel plates. In this way, two or more types of laminated blocks having weld grooves having different shapes can be formed, and when these are stacked, the boundary between adjacent laminated blocks can be clearly confirmed visually by the weld grooves having different shapes. It will be a thing. According to this method, the present invention can also be applied to a case where a plurality of stacked blocks are stacked without performing transposition.

  In the above description, the three laminated blocks are stacked. However, the number of stacked blocks may be other than three. For example, two stacked blocks may be stacked, or four or more stacked blocks may be stacked. That is, each laminated block is formed by laminating shaped steel plates having weld grooves having the same groove contour shape on the outer peripheral surface, and the laminated blocks adjacent to each other have different groove contour shapes on the outer peripheral surface. If these laminated blocks are stacked, the boundary between adjacent laminated blocks will appear to the extent that it can be clearly confirmed visually due to the difference in the groove contour shape on the outer peripheral surface. .

  In the above description, the welding groove is formed by combining two semicircular shapes having a radius R, and the guide protrusion 22 is provided at the center of the welding groove. In addition to this, one semicircular shape having a radius R may be used, and an appropriate convex portion may be provided at the center portion to be used as a reference convex portion. Moreover, shapes other than semicircle shape may be sufficient, and in that case, what is necessary is just to set as the groove | channel external shape in an outer peripheral surface mutually different about multiple types of welding grooves.

  The difference in the outer shape of the groove on the outer peripheral surface may be anything that can be identified by visual observation other than the difference in the indentation dimension of the recess on the outer peripheral surface. 6 and 7, the indentation dimensions of the indentation on the outer peripheral surface are the same, but whether or not to provide a notch in the welding groove, and when providing the notch, a plurality of types are provided by making the arrangement positions different from each other. It is a figure which shows the example used as this welding groove.

  That is, FIG. 6 shows three types of welding grooves 42, 44, 46 as a plurality of types of welding grooves 40 having different groove outer shapes on the outer peripheral surface. Since these weld grooves 42, 44, and 46 are each configured by combining two semicircular shapes having the same radius R, the indentation dimensions of the recesses on the outer peripheral surface are the same.

  The first is a weld groove 42 that is simply a combination of two semicircular shapes having the same radius R and is not provided with a notch. The second is a welding groove 44 in which two semicircular shapes having the same radius R are combined, and a local notch G is further provided on one of the two semicircular shapes. The third is a welding groove 44 in which two semicircular shapes having the same radius R are combined and a local notch G is further provided in the other semicircular shape of the two semicircular shapes.

  The notch G is provided with a small depression on the inner diameter side than the semicircular shape. The magnitude | size of the notch part G should just be the grade which can recognize the presence or absence and its arrangement | positioning. Empirically, for example, if it is a depression with a passing dimension of about 1 mm, the presence or absence and the arrangement position can be distinguished.

  In FIG. 6, the welding groove 42 without the notch G, the welding groove 44 with the notch G provided in a semicircular shape on the left side of the reference convex portion, and the notch G are provided in a semicircular shape on the right side of the reference convex portion. Each of the weld grooves 46 is shown. FIG. 7 shows a state in which the laminated block 19 having the weld groove 46 is disposed at the top, the laminated block 15 having the weld groove 42 is disposed at the center, and the laminated block 17 having the weld groove 44 is disposed at the bottom. It is shown. As shown in FIG. 7, the boundary between adjacent stacked blocks can be clearly identified by the presence or absence of the notch G and the difference in the arrangement position thereof.

In embodiment which concerns on this invention, it is a figure explaining the structure of the stator core which comprises a rotary electric machine. In embodiment which concerns on this invention, it is a figure which shows a mode that the groove outline shape of the welding groove in the outer peripheral surface of each laminated block becomes mutually different. In embodiment which concerns on this invention, it compares and shows the top view of three types of welding grooves. In embodiment concerning this invention, it is a flowchart which shows the manufacture procedure of a stator core. It is a figure explaining the mode of each procedure corresponding to FIG. In embodiment which concerns on this invention, it is a figure which shows another example from which the groove outline shape of the welding groove in the outer peripheral surface of each lamination | stacking block differs mutually. It is a figure which shows a mode that the lamination | stacking block was piled up when the example of FIG. 6 was used.

Explanation of symbols

  8 Magnetic steel sheet, 10 Stator core, 11 Comb-shaped shaped part, 12 Shaped steel sheet, 13 Mounting part, 14, 15, 16, 17, 18, 19 Laminated block, 20 Welded bead, 22 Standard convex part, 30, 32, 34, 36, 40, 42, 44, 46 Weld groove.

Claims (5)

Stacking laminated blocks formed by laminating a plurality of shaped steel plates that have been processed into a predetermined shape, and welding and fixing each other laminated block at the location of the preset welding groove on the outer periphery A motor core,
Each laminated block is configured by laminating shaped steel plates having weld grooves with the same groove contour shape on the outer peripheral surface,
Each of the laminated blocks stacked adjacent to each other has a weld groove having a groove contour shape different from each other on the outer peripheral surface. The motor core according to claim 1,
Each shaped steel plate has a semicircular weld groove having a radius R preset in a planar shape,
Each of the laminated blocks stacked adjacent to each other is distinguished by having welding grooves having different radii R from each other. The motor core according to claim 1,
Each shaped steel plate has a welding groove including a semicircular shape having a preset radius R in a planar shape, and a notch that can be further added to the semicircular shape,
Each of the stacked blocks stacked adjacent to each other has the same radius R and is distinguished by the presence or absence of an addable notch, or is distinguished by being different from each other in the arrangement position of the notch in the semicircular shape. Motor core to do. The motor core according to any one of claims 1 to 3,
The stacked blocks are stacked by rotating each other at a rolling angle set by dividing an angle of 360 degrees around a central axis parallel to the stacking direction by a predetermined integer of 2 or more. A motor core, wherein the stacked cores are stacked so that the positions of the welding grooves on the outer periphery are the same. The motor core according to claim 4,
Each shaped steel plate has a plurality of weld grooves arranged on the outer peripheral surface at every rolling angle around a central axis parallel to the stacking direction,
A motor core characterized in that a plurality of weld grooves in each shaped steel plate have mutually different groove contour shapes on the outer peripheral surface.

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