Electromagnetic steel sheet laminate

Abstract

This electromagnetic steel sheet laminate comprises: an A-type core block in which A-type core sheets are laminated; and a B-type core block in which B-type core sheets are laminated. A plurality of A-type core blocks and a plurality of B-type core blocks are laminated, and the A-type core blocks and the B-type core blocks have rotational symmetry. A side surface of the A-type core sheet has a first mark for each stacking rotation angle. A side surface of the B-type core sheet has a second mark different from the first mark.

Description

Electromagnetic steel sheet laminate

[0001] The present disclosure relates to an electromagnetic steel sheet laminate.

[0002] Conventionally, motors are used in driving devices for vehicles such as electric vehicles. A stator core and a rotor core in a motor are configured by laminating core sheets made of electromagnetic steel sheets. Generally, since electromagnetic steel sheets are formed into a plate shape by rolling, the plate thickness is non-uniform. Therefore, core sheets formed by punching electromagnetic steel sheets with a press also have non-uniform plate thickness. If core sheets with non-uniform plate thickness are laminated as they are, the electromagnetic steel sheet laminate will tilt. For this reason, in electromagnetic steel sheet laminates, the non-uniformity of plate thickness is absorbed by performing shifting lamination. At this time, in order to check whether the core sheets have been shift-laminated or not, a mark may be placed on the side surface of the outer edge of the core sheet. An example of such a technique is described in Patent Document 1, the source of which is shown below.

[0003] Patent Document 1 describes the structure of a stator core of a motor (rotating electric machine in Patent Document 1). This stator core is configured by shift-laminating a plurality of core sheets made of annular plate-shaped electromagnetic steel sheets. On the side surface of the outer edge of the core sheet, there is formed a mark (identification portion in Patent Document 1) that can identify whether shift lamination has been performed (shift lamination identification) and also identify from which row of a single steel sheet the core sheet was extracted (row identification). Specifically, by arranging a plurality of (three in Patent Document 1) marks unevenly in the circumferential direction with respect to the central axis, the three marks are arranged shifted from each other in the circumferential direction due to shift lamination. By checking the shift of these marks and the manner of the shift, shift lamination identification and row identification can be performed simultaneously.

[0004] Japanese Patent Application Laid-Open No. 2020-114078

[0005] In order to perform identification using the marks described in Patent Document 1, all core sheets must have the same shape so that they can be rolled up. However, for example, when forming oil passages for circulating cooling oil inside the core sheets, some core sheets may have a shape that makes them unrollable. In such cases, the method described in Patent Document 1 does not allow confirmation of the position (stack order) or number of stacks along the central axis direction of the unrollable core sheets, and there is room for improvement.

[0006] Therefore, there is a need for an electrical steel sheet laminate that includes core sheets with a shape that can be rolled and core sheets with a shape that cannot be rolled, and that allows for easy confirmation of the position (lamination order) and number of layers along the central axis direction of each core sheet.

[0007] One embodiment of the electromagnetic steel sheet laminate according to the present disclosure comprises an A-type core block made of electromagnetic steel sheets, in which one or more A-type core sheets are laminated along a central axis, and a B-type core block made of electromagnetic steel sheets, in which one or more B-type core sheets are laminated along the central axis, wherein the A-type core block and the B-type core block are laminated in multiples along the central axis and integrated, the A-type core block and the B-type core block have a rotationally symmetrical shape with respect to the central axis n times (n is a natural number of 2 or more) when viewed along the central axis, a first mark is placed on the side surface of the A-type core sheet at intervals where the central angle with respect to the central axis is X・(360 / n) degrees, and a second mark different from the first mark is placed on the side surface of the B-type core sheet.

[0008] In the electromagnetic steel sheet laminate according to this embodiment, a first mark is placed on the side surface of the A-type core block at intervals where the central angle with respect to the central axis is X・(360 / n) degrees, and a second mark, different from the first mark, is placed on the side surface of the B-type core block. Therefore, for the A-type core block, the first mark remains in the same location even after stacking, and for the B-type core block, a second mark, different from the first mark, is placed. Thus, by looking at the first and second marks, the stacking position (stacking order) and number of stacks along the axial direction of the A-type core block and the B-type core block can be confirmed (visually identified).

[0009] This is a perspective view of the stator core according to this embodiment. This is a plan view of the first core sheet. This is a plan view of the second core sheet. This is a plan view of the third core sheet. This is a plan view of the fourth core sheet. This is a plan view of the fifth core sheet. This is a plan view of the first forward core sheet. This is a plan view of the first reverse core sheet. This is a front view of the first core block constructed by the first method. This is a front view of a plurality of first core blocks constructed by the second method. This is a perspective view of the stator core according to another embodiment (3). This is a perspective view of the stator core according to another embodiment (3). This is a perspective view of the stator core according to another embodiment (4).

[0010] Hereinafter, embodiments of the electromagnetic steel sheet laminate according to this disclosure will be described in detail with reference to the drawings. The embodiments described below are illustrative examples for explaining the electromagnetic steel sheet laminate according to this disclosure, and do not limit the electromagnetic steel sheet laminate to these embodiments only. Therefore, the electromagnetic steel sheet laminate according to this disclosure can be implemented in various forms without departing from its essence.

[0011] The stator core 1 (an example of an electromagnetic steel sheet laminate) according to this embodiment is used in a motor (not shown). The motor comprises the stator core 1, a coil (not shown) wound around the stator core 1, a rotor (not shown) positioned opposite the stator core 1, a shaft (not shown) that rotates integrally with the rotor and transmits rotational driving force, and a plurality of permanent magnets (not shown) built into the rotor. The motor generates a rotating magnetic field by passing an electric current through the coil, and generates driving force by rotating the rotor due to the attractive and repulsive forces between the rotating magnetic field and the plurality of permanent magnets. The generated driving force is transmitted from the rotor to the shaft. Note that the motor is not limited to a configuration in which a magnetic field is generated by permanent magnets. For example, it may be a configuration in which a magnetic field is generated by windings.

[0012] [Structure of the Stator Core] As shown in Figure 1, the stator core 1 is constructed by stacking multiple core sheets 10 made of electrical steel sheets (silicon steel sheets) in a direction along the central axis Z (hereinafter simply referred to as the axial direction) (30 in this embodiment). More precisely, the stator core 1 has multiple core blocks 5 (10 in this embodiment) in which multiple core sheets 10 (3 in this embodiment) are stacked, and is formed by rolling some of the 10 core blocks 5. "Rolling" means stacking two core blocks 5 that are arranged in the axial direction (the stacking direction of the core blocks 5) while rotated by a predetermined angle in one direction. The two rolled core blocks 5 may be arranged adjacent to each other in the axial direction, or they may be arranged spaced apart in the axial direction with other core blocks 5 etc. placed between them. The thickness of the core sheet 10 made of rolled electrical steel sheets is not uniform; for example, one end may be thicker and the other end thinner, making it non-uniform. If core sheets 10 with uneven thickness are stacked without rotation, the thicker and thinner sections will overlap during stacking, which may cause the stator core 1 to tilt with respect to the central axis Z. Therefore, in the stator core 1, the unevenness of the core sheet 10 is absorbed by stacking multiple core blocks 5, thereby suppressing the tilt of the stator core 1 with respect to the central axis Z and leveling the height.

[0013] In this embodiment, the stator core 1 uses five types of core sheets 10 stacked together, each having the same outer shape (contour) but different overall shapes. Specifically, these are: a first core sheet 10a (an example of a Type B core sheet; see Figure 2) having a shape that cannot be rolled up; a second core sheet 10b (an example of a Type B core sheet; see Figure 3) having a shape that cannot be rolled up; a third core sheet 10c (an example of a Type A core sheet; see Figure 4) having a shape that can be rolled up; a fourth core sheet 10d (an example of a Type A and Type C core sheet; see Figure 5) having a shape that can be rolled up; and a fifth core sheet 10e (an example of a Type A and Type C core sheet; see Figure 6) having a shape that can be rolled up. Hereinafter, the first core sheet 10a, the second core sheet 10b, the third core sheet 10c, the fourth core sheet 10d, and the fifth core sheet 10e will also be referred to collectively as core sheet 10.

[0014] [Core Structure] As shown in Figures 1 to 6, the core sheet 10 has an annular plate shape when viewed in the direction along the central axis Z (hereinafter also simply referred to as the axial view), and a plurality of teeth 12 (48 in this embodiment) projecting radially inward from the inner edge are formed at equal intervals along the circumferential direction with respect to the central axis Z (the central angle of the central axis Z is 7.5 degrees). In addition, a plurality of fixing parts 14 (4 in this embodiment) for fixing the stacked core sheets 10 are formed at equal intervals along the circumferential direction with respect to the central axis Z (the central angle of the central axis Z is 90 degrees) on the outer edge of the core sheet 10. The fixing parts 14 have a substantially trapezoidal shape. One bolt hole 14a, which is a through hole, is formed in each fixing part 14. That is, four bolt holes 14a are formed in the core sheet 10. The bolt holes 14a are used when attaching the stator core 1 with the coil wound around it to the motor case (not shown). In the following, the terms "teeth 12," "fixing portion 14," "bolt hole 14a," and "through-oil passage 16" (details to be described later) formed on the core sheet 10 will also be used for the core block 5 and stator core 1. When these part names are used in reference to the core block 5 and stator core 1, they refer to the collective term for these parts formed on multiple core sheets 10.

[0015] In this embodiment, since the number of fixing parts 14 and the number of teeth 12 are both multiples of 4, the outer shape (contour) of the core sheet 10 is rotationally symmetric four times with respect to the central axis Z. A rotationally symmetric shape of n times (where n is a natural number greater than or equal to 2) is a shape that, when rotated by (360 / n) degrees around a certain point, overlaps with the original shape. The outer shape (contour) of the core sheet 10 in this embodiment overlaps with the original shape when rotated by 90 (= 360 / 4) degrees around the central axis Z, so it is said to be rotationally symmetric four times. In the core sheet 10, if it is rotationally symmetric, it can be transposed. The third core sheet 10c, the fourth core sheet 10d, and the fifth core sheet 10e are all rotationally symmetric four times, so they can be transposed. However, although the outer shape (contour) of the first core sheet 10a and the second core sheet 10b is rotationally symmetrical four times, due to the position of the through-oil passage 16 described later, the overall shape is not rotationally symmetrical four times, and therefore, conversion is not possible.

[0016] The core sheet 10 has through-passages 16 formed on the outer diameter of the teeth 12 for circulating cooling oil (for example, insulating oil such as paraffin). The first core sheet 10a, the second core sheet 10b, the third core sheet 10c, the fourth core sheet 10d, and the fifth core sheet 10e each have through-passages 16 that differ in number and location. Therefore, although the outer shape (contour) is the same, the overall shape is different. Hereinafter, the through-passages 16 formed in the first core sheet 10a will be referred to as the first through-passage 16a, the through-passages 16 formed in the second core sheet 10b as the second through-passage 16b, the through-passages 16 formed in the third core sheet 10c as the third through-passage 16c, the through-passages 16 formed in the fourth core sheet 10d as the fourth through-passage 16d, and the through-passages 16 formed in the fifth core sheet 10e as the fifth through-passage 16e. The first core sheet 10a, the second core sheet 10b, the third core sheet 10c, the fourth core sheet 10d, and the fifth core sheet 10e all have the same shape for their individual through-passages 16, but their overall shapes differ because the number and location of the through-passages 16 are different. In the following, when referring to the first through-passage 16a, the second through-passage 16b, the third through-passage 16c, the fourth through-passage 16d, and the fifth core sheet 10e collectively, they will also be referred to as through-passages 16.

[0017] As shown in Figures 2 to 5, common oil passages 17a are formed in the first core sheet 10a, the second core sheet 10b, the third core sheet 10c, and the fourth core sheet 10d, near the bolt holes 14a of each of the four fixing parts 14. That is, four common oil passages 17a are formed in each of the first core sheet 10a, the second core sheet 10b, the third core sheet 10c, and the fourth core sheet 10d. The common oil passages 17a are circular through-holes with a smaller diameter than the bolt holes 14a. The central angle between two adjacent common oil passages 17a in the circumferential direction and the central axis Z is 90 degrees. That is, the four common oil passages 17a are evenly distributed in the circumferential direction. Note that no common oil passages 17a are formed in the fifth core sheet 10e (see Figure 6).

[0018] As shown in Figure 2, the first core sheet 10a has a shape that cannot be rolled. The first through-passage 16a is an arc-shaped through-hole with a central angle slightly greater than 45 degrees with respect to the central axis Z. Only one first through-passage 16a is formed in the first core sheet 10a.

[0019] As shown in Figure 3, the second core sheet 10b also has a shape that cannot be rolled. The second through-passage 16b is an arc-shaped through-hole with a central angle slightly greater than 45 degrees with respect to the central axis Z. Four second through-passages 16b are formed evenly along the circumferential direction. That is, the second through-passages 16b are arranged at 90-degree intervals with respect to the central axis Z. The distance (radius) from the central axis Z to the first through-passage 16a is equal to the distance to the second through-passage 16b.

[0020] One of the four second through-oil passages 16b is connected to a common oil passage 17a located closest to it. Hereinafter, the oil passage connecting the second through-oil passage 16b and the common oil passage 17a will be referred to as the connecting oil passage 17b. In this embodiment, when the first core sheet 10a in the orientation shown in Figure 2 and the second core sheet 10b in the orientation shown in Figure 3 are stacked so that they overlap in an axial view, the connecting oil passage 17b connects the common oil passage 17a to the second through-oil passage 16b which is point-symmetric to the second through-oil passage 16b that overlaps with the first through-oil passage 16a with respect to the central axis Z. Furthermore, when stacked, the first through-oil passage 16a and the second through-oil passage 16b completely overlap.

[0021] As shown in Figure 4, the third core sheet 10c has a shape that allows for stacking. The third through-passage 16c is an arc-shaped through-hole with a central angle slightly greater than 45 degrees relative to the central axis Z. The distance (radius) from the central axis Z to the second through-passage 16b is equal to the distance to the third through-passage 16c. Four third through-passages 16c are formed evenly along the circumferential direction. That is, the third through-passages 16c are arranged at 90-degree intervals relative to the central axis Z. Each of the four third through-passages 16c is positioned to perfectly overlap each of the four second through-passages 16b when the third core sheet 10c in the orientation shown in Figure 4 and the second core sheet 10b in the orientation shown in Figure 3 are stacked so that they overlap in an axial view.

[0022] As shown in Figure 5, the fourth core sheet 10d has a shape that allows for rolling. The fourth through-passage 16d is an arc-shaped through-hole with a central angle slightly greater than 45 degrees relative to the central axis Z. The distance (radius) from the central axis Z to the third through-passage 16c is equal to the distance to the fourth through-passage 16d. Four fourth through-passages 16d are formed evenly along the circumferential direction. That is, the fourth through-passages 16d are arranged with a central angle of 90 degrees relative to the central axis Z.

[0023] Each of the four fourth through-passages 16d is positioned to perfectly overlap with each of the four third through-passages 16c when the third core sheet 10c in the orientation shown in Figure 4 is stacked so that it overlaps with the fourth core sheet 10d in the orientation shown in Figure 5 in an axial view, with the third core sheet 10c in the orientation shown in Figure 4 rotated 45 degrees with respect to the central axis Z. That is, when the fourth core sheet 10d in the orientation shown in Figure 5 and the third core sheet 10c in the orientation shown in Figure 4 are stacked so that they overlap in the axial direction, each of the four fourth through-passages 16d is positioned at a location where each of the four third through-passages 16c is rotated 45 degrees in the circumferential direction with respect to the central axis Z.

[0024] As shown in Figure 6, the fifth core sheet 10e has a shape that allows for stacking. As described above, no common oil passages 17a are formed in any of the fixed portions 14 of the fifth core sheet 10e. The fifth through-passage oil passage 16e is an arc-shaped through-hole with a central angle slightly greater than 45 degrees with respect to the central axis Z. The distance (radius) from the central axis Z to the fourth through-passage oil passage 16d is equal to the distance to the fifth through-passage oil passage 16e. Therefore, the distance (radius) from the central axis Z to the first through-passage oil passage 16a to the fifth through-passage oil passage 16e is all equal. Four fifth through-passage oil passages 16e are formed evenly along the circumferential direction. That is, the fourth through-passage oil passages 16d are arranged with a central angle of 90 degrees with respect to the central axis Z.

[0025] As described above, both the fourth through-passage 16d and the fifth through-passage 16e are arc-shaped through-holes with a central angle slightly greater than 45 degrees with respect to the central axis Z. Furthermore, each of the four fifth through-passages 16e is positioned to perfectly overlap with each of the four fourth through-passages 16d when the fifth core sheet 10e in the orientation shown in Figure 6 and the fourth core sheet 10d in the orientation shown in Figure 5 are stacked so that they overlap in an axial view.

[0026] [Recess on the Right Side] As shown in Figure 2, of the four fixing parts 14 of the first core sheet 10a, which has a shape that cannot be rolled, a first recess 18a (an example of a second mark) is formed on the side surface (hereinafter simply referred to as the right side) of the two substantially trapezoidal legs of the fixing part 14 located at a point-symmetric position of the fixing part 14 that is closest to the first through-oil passage 16a with respect to the central axis Z, in an axial view. In the first core sheet 10a, the remaining three fixing parts 14 do not have the first recess 18a formed thereon. Note that one first recess 18a may be formed in a fixing part 14 other than the fixing part 14 described above.

[0027] As shown in Figure 3, of the four fixing portions 14 of the second core sheet 10b, which has a shape that makes it impossible to roll, a second recess 18b (an example of a second mark) is formed on the right side of the fixing portion 14 in which the communicating oil passage 17b is formed. In the second core sheet 10b, the second recess 18b is not formed in the remaining three fixing portions 14. The distance from the central axis Z to the second recess 18b is longer than the distance from the central axis Z to the first recess 18a. The second recess 18b may be formed in fixing portions 14 other than the fixing portion 14 described above, but it is desirable that it be formed in a fixing portion 14 that overlaps in a plan view with the fixing portion 14 in which the first recess 18a is formed when the first core sheet 10a in the orientation shown in Figure 2 and the second core sheet 10b in the orientation shown in Figure 3 are stacked.

[0028] As shown in Figure 4, the third core sheet 10c, which has a stackable shape, has third recesses 18c (an example of a first mark) formed on the right side of all four fixing portions 14. The distance from the central axis Z to all four third recesses 18c is equal. Also, the distance from the central axis Z to the third recess 18c is longer than the distance from the central axis Z to the second recess 18b.

[0029] As shown in Figure 5, the fourth core sheet 10d, which has a shape that allows for rolling, has a fourth recess 18d (an example of a first mark and a third mark) formed on the right side of all four fixing parts 14. The distance from the central axis Z to all four fourth recesses 18d is equal. Also, the distance from the central axis Z to the fourth recess 18d is longer than the distance from the central axis Z to the second recess 18b, and shorter than the distance to the third recess 18c.

[0030] As shown in Figure 6, the fifth core sheet 10e, which has a shape that allows for rolling, has a fifth recess 18e (an example of a first mark and a third mark) formed on the right side of all four fixing parts 14. The distance from the central axis Z to all four fifth recesses 18e is equal. Also, the distance from the central axis Z to the fifth recess 18e is shorter than the distance from the central axis Z to the first recess 18a.

[0031] In summary, in the first core sheet 10a and the second core sheet 10b, which have shapes that cannot be rolled, the first recess 18a and the second recess 18b are formed in only one fixing part 14 each, while in the third core sheet 10c, the fourth core sheet 10d, and the fifth core sheet 10e, which have shapes that can be rolled, the third recess 18c, the fourth recess 18d, and the fifth recess 18e are formed in all fixing parts 14. Furthermore, the distance from the central axis Z increases in the order of the fifth recess 18e, the first recess 18a, the second recess 18b, the fourth recess 18d, and the third recess 18c (see Figure 1). Hereinafter, when referring to the first recess 18a, the second recess 18b, the third recess 18c, the fourth recess 18d, and the fifth recess 18e collectively, they will also be referred to as recess 18. Although the first core sheet 10a to the fifth core sheet 10e each have recesses 18 formed at different positions, the recesses 18 are extremely small and can be ignored when defining the outer shape (contour). Therefore, even with the presence of the recesses 18, the first core sheet 10a to the fifth core sheet 10e have the same outer shape (contour).

[0032] [Core Block Configuration] As shown in Figure 1, the stator core 1 of this embodiment is constructed by stacking a first core block 5a (an example of a B-type core block) formed by stacking three first core sheets 10a, a second core block 5b (an example of a B-type core block) formed by stacking three second core sheets 10b, a third core block 5c (an example of an A-type core block) formed by stacking three third core sheets 10c, a fourth core block 5d (an example of an A-type and C-type core block) formed by stacking three fourth core sheets 10d, and a fifth core block 5e (an example of an A-type and C-type core block) formed by stacking three fifth core sheets 10e.

[0033] Since the first core block 5a and the second core block 5b have shapes that make them unsuitable for rolling, the three first core sheets 10a and the three second core sheets 10b are not rolled and are stacked as they are. Similarly, since the third core block 5c is rolled on a core block basis, the third core sheet 10c that constitutes one third core block 5c is not rolled and is stacked as it is. Since the fourth core block 5d and the fifth core block 5e are not rolled on a block basis, the three fourth core sheets 10d and the three fifth core sheets 10e are all rolled at a 90-degree angle. The fourth core sheet 10d and the fifth core sheet 10e are rotationally symmetrical four times, and the fourth recess 18d and the fifth recess 18e are formed on the right side of all four fixing parts 14. Therefore, even if the three fourth core sheets 10d and the three fifth core sheets 10e are rotated in units of 90 degrees, the fourth recess 18d and the fifth recess 18e are arranged on the right side of all four fixing parts 14 of the fourth core block 5d and the fifth core block 5e.

[0034] [Stacking of Core Blocks] The stator core 1 of this embodiment is constructed by stacking two first core blocks 5a, one second core block 5b, four third core blocks 5c, two fourth core blocks 5d, and one fifth core block 5e. Specifically, as shown in Figure 1, from the front to the back, the cores are stacked in the following order: one first core block 5a, one fourth core block 5d, two third core blocks 5c, one second core block 5b, one fifth core block 5e, two third core blocks 5c, one fourth core block 5d, and one first core block 5a.

[0035] To explain the stacking of the stator core 1 in more detail from the perspective of the through-oil passages 16 and recesses 18, a second core block 5b (three second core sheets 10b) is placed in the axial center of the stator core 1, and a third core block 5c (three third core sheets 10c) is stacked on one side of the second core block 5b in the axial direction. At this time, the third core block 5c, which has the third core sheets 10c stacked in the orientation shown in Figure 4, is stacked so that it overlaps the second core block 5b, which has the second core sheets 10b stacked in the orientation shown in Figure 3, in an axial view. As a result, the four third through-oil passages 16c of the third core block 5c are positioned to completely overlap the four second through-oil passages 16b of the second core block 5b.

[0036] In the second core sheet 10b, a second recess 18b is formed on the right side of one of the four fixing parts 14; therefore, the second recess 18b is located on the right side of one of the fixing parts 14 of the second core block 5b. On the other hand, in the third core sheet 10c, a third recess 18c is formed on the right side of all four fixing parts 14; therefore, the third recess 18c is located on the right side of all four fixing parts 14 of the third core block 5c. As described above, the second recess 18b and the third recess 18c are at different distances from the central axis Z; therefore, as shown in Figure 1, when the second core block 5b and the third core block 5c are stacked, the second recess 18b and the third recess 18c are located at different locations on the right side of the fixing part 14. As a result, by taking a look at the right side of the fixed portion 14 where the second recess 18b is located, the second recess 18b and the third recess 18c can be seen simultaneously, and it can be visually confirmed that the second core block 5b and the third core block 5c are stacked adjacent to each other.

[0037] When stacking the fifth core block 5e on the other side of the second core block 5b in the axial direction, the fifth core block 5e, which has the fifth core sheet 10e stacked in the orientation shown in Figure 6, is stacked on the second core block 5b, which has the second core sheet 10b stacked in the orientation shown in Figure 3, so that they overlap in an axial view. As a result, the fifth through-oil passage 16e of the fifth core block 5e is positioned so that it is offset by 45 degrees with respect to the central axis Z relative to the second through-oil passage 16b of the second core block 5b.

[0038] As described above, the second through-passage 16b and the fifth through-passage 16e have an arc shape with a central angle slightly greater than 45 degrees with respect to the central axis Z, so the ends of the second through-passage 16b and the fifth through-passage 16e overlap each other in an axial view. As a result, at the boundary between the second core block 5b and the fifth core block 5e, all four second through-passage 16b and four fifth through-passage 16e are connected to form an annular oil passage.

[0039] Since the fifth core sheet 10e has a fifth recess 18e formed on the right side of all four fixing parts 14, the fifth recess 18e is located on the right side of all four fixing parts 14 of the fifth core block 5e. As described above, the second recess 18b and the fifth recess 18e are at different distances from the central axis Z, so as shown in Figure 1, when the second core block 5b and the fifth core block 5e are stacked, the second recess 18b and the fifth recess 18e are located at different locations on the right side of the fixing part 14. As a result, by looking at the right side of the fixing part 14 where the second recess 18b is located, the second recess 18b and the fifth recess 18e can be seen simultaneously, and it can be visually confirmed that the second core block 5b and the fifth core block 5e are stacked adjacent to each other.

[0040] Furthermore, since the third recess 18c and the fifth recess 18e are at different distances from the central axis Z, as shown in Figure 1, when the third core block 5c and the fifth core block 5e are stacked on the second core block 5b, a glance at the right side of the fixing part 14 where the second recess 18b is located allows one to see the second recess 18b, the third recess 18c, and the fifth recess 18e simultaneously, and it can be visually confirmed that the third core block 5c and the fifth core block 5e are stacked adjacent to the second core block 5b.

[0041] In the stator core 1, another third core block 5c is stacked on the side of the third core block 5c that is stacked on the second core block 5b, and is rotated at a 90-degree angle to the adjacent third core block 5c. That is, two third core blocks 5c are stacked consecutively on one side of the second core block 5b. As described above, when the third core sheet 10c in the orientation shown in Figure 4 and the second core sheet 10b in the orientation shown in Figure 3 are stacked so that they overlap in an axial view, the four third through-oil passages 16c are arranged to completely overlap each of the four second through-oil passages 16b. Therefore, the four second through-oil passages 16b of the second core block 5b and the four third through-oil passages 16c of each of the two third core blocks 5c are arranged to completely overlap.

[0042] At this time, as shown in FIG. 1, the third recesses 18c of the two continuously stacked third core blocks 5c (six third core sheets 10c) are aligned in a straight line on the right side surface of the fixing portion 14. Accordingly, by a glance at the third recess 18c on the right side surface of any one of the four fixing portions 14, it can be visually recognized that the two third core blocks 5c are continuously stacked.

[0043] On the side of the fifth core block 5e stacked on the second core block 5b, two further third core blocks 5c are respectively arranged by being rotated and stacked at 90 degrees. As described above, since four third through oil passages 16c are arranged every 90 degrees of the central angle with respect to the central axis Z, with respect to the fifth core block 5e obtained by stacking the fifth core sheets 10e in the posture shown in FIG. 6 adjacent to each other in the stacking direction, when the third core block 5c obtained by stacking the third core sheets 10c in the posture shown in FIG. 4 is stacked so as to overlap when viewed in the axial direction, the third through oil passage 16c of the third core block 5c can be positioned between any two adjacent fifth through oil passages 16e in the circumferential direction of the fifth core block 5e. That is, the third through oil passage 16c of the third core block 5c is arranged shifted by 45 degrees with respect to the fifth through oil passage 16e of the fifth core block 5e. As described above, since both the fifth through oil passage 16e and the third through oil passage 16c have an arc shape whose central angle with respect to the central axis Z is slightly larger than 45 degrees, when the third core block 5c is arranged in this manner with respect to the fifth core block 5e, the end portions of the fifth through oil passage 16e and the third through oil passage 16c overlap each other when viewed in the axial direction. Accordingly, at the boundary between the fifth core block 5e and the third core block 5c, the four fifth through oil passages 16e and the four third through oil passages 16c are annularly connected over the entire circumference to form an annular oil passage.

[0044] At this time, as shown in FIG. 1, the third recesses 18c of the two continuously stacked third core blocks 5c are aligned in a straight line on the right side surface of the fixing portion 14. Accordingly, by a glance at the fifth recess 18e and the third recess 18c on the right side surface of any one of the four fixing portions 14, it can be visually recognized that two third core blocks 5c are continuously stacked adjacent to the fifth core block 5e.

[0045] As shown in Figure 1, a fourth core block 5d is stacked on the outer side of each of the third core blocks 5c, which are stacked on both sides of the second core block 5b. As described above, the third through-passage 16c and the fourth through-passage 16d have an arc shape with a central angle slightly greater than 45 degrees with respect to the central axis Z, and the fourth through-passage 16d of the fourth core block 5d is positioned 45 degrees circumferentially with respect to the central axis Z relative to the third through-passage 16c of the third core block 5c. Therefore, when the fourth core block 5d is positioned relative to the third core block 5c, the ends of the third through-passage 16c and the fourth through-passage 16d overlap each other in an axial view. As a result, at the boundary between the third core block 5c and the fourth core block 5d, the four third through-passage 16c and the four fourth through-passage 16d are connected in a ring shape around the entire circumference, forming an annular oil passage.

[0046] Furthermore, as described above, since the fourth recess 18d of the fourth core block 5d and the third recess 18c of the third core block 5c are at different distances from the central axis Z, when the fourth core block 5d and the third core block 5c are stacked, the fourth recess 18d and the third recess 18c are located at different points on the right side of the fixing part 14. As a result, by looking at the right side of the four fixing parts 14 where the fourth recess 18d is located, the third recess 18c is also formed there, and it can be seen that the fourth core block 5d and the third core block 5c are stacked adjacent to each other.

[0047] As shown in FIG. 1, first core blocks 5a are laminated on either side further outward of fourth core blocks 5d respectively laminated on both sides of the third core block 5c. Thereby, the stator core 1 is completed. At this time, in any first core block 5a, when viewed in the axial direction, the fixing portion 14 formed with the second recess 18b of the second core block 5b and the fixing portion 14 formed with the first recess 18a are arranged to overlap each other. When the first core block 5a is arranged in such a posture, between the first core block 5a and the adjacent fourth core block 5d, the first through oil passage 16a is located at a position shifted by 45 degrees in the circumferential direction with respect to the central axis Z from the fourth through oil passage 16d of the adjacent fourth core block 5d. That is, the first through oil passage 16a is located between two fourth through oil passages 16d adjacent to each other in the circumferential direction.

[0048] Further, as described above, the first recess 18a of the first core block 5a and the fourth recess 18d of the fourth core block 5d have different distances from the central axis Z. Therefore, in a state where the first core block 5a and the fourth core block 5d are laminated, the first recess 18a and the fourth recess 18d are located at different positions on the right side surface of the fixing portion 14. Thereby, when one looks at the right side surface of the four fixing portions 14 where the first recess 18a is arranged, the fourth recess 18d is also formed there, so that it can be visually recognized that the first core block 5a and the fourth core block 5d are laminated adjacent to each other.

[0049] In the stator core 1 formed as described above, the first recess 18a and the second recess 18b are located on the right side of the same fixing part 14, while the third recess 18c, the fourth recess 18d, and the fifth recess 18e are located on the right side of all fixing parts 14. Therefore, as shown in Figure 1, the third recess 18c, the fourth recess 18d, and the fifth recess 18e are also located on the right side where the first recess 18a and the second recess 18b are located, and all of the first recess 18a to the fifth recess 18e that constitute the recess 18 are located on the right side of one fixing part 14. In other words, the first recess 18a to the fifth recess 18e are all located in close proximity to each other. Furthermore, each of the first recess 18a to the fifth recess 18e is at a different distance from the central axis Z. Therefore, as shown in Figure 1, by simply looking at the right side of the fixing portion 14 where the first recess 18a is located, the stacking positions (stacking order) and number of stacks along the axial direction of each core block from the first core block 5a to the fifth core block 5e can be visually confirmed. Furthermore, the relative circumferential positional relationship between the first core block 5a and the second core block 5b, which have shapes that make them impossible to stack, can also be visually confirmed. In other words, it is possible to confirm at a glance whether the stator core 1 is a good product that has been manufactured correctly.

[0050] [Cooling Oil Flow] In the stator core 1 stacked as described above, cooling oil is introduced from the first core block 5a (the first core block 5a located closest to the viewer in Figure 1) that is on the opposite side of the fifth core block 5e from the second core block 5b. Specifically, among the four common oil passages 17a of the first core block 5a, the cooling oil is introduced from the common oil passage 17a that overlaps in an axial view with the common oil passage 17a connected to the communicating oil passage 17b of the second core block 5b. In other words, in this embodiment, cooling oil is introduced from the common oil passage 17a located in the fixed portion 14 where the first recess 18a is formed.

[0051] Since the common oil passage 17a is formed in the first core block 5a, the second core block 5b, the third core block 5c, and the fourth core block 5d, the cooling oil flowing in from the common oil passage 17a of the first core block 5a flows through the first core block 5a, the fourth core block 5d, and the two stacked third core blocks 5c to reach the common oil passage 17a of the second core block 5b. Since the fifth core block 5e, which is located next to the second core block 5b, does not have a common oil passage 17a, the cooling oil that reaches the common oil passage 17a of the second core block 5b does not flow through the fifth core block 5e, but flows through the connecting oil passage 17b of the second core block 5b and reaches the second through oil passage 16b connected to the connecting oil passage 17b.

[0052] As described above, at the boundary between the second core block 5b and the adjacent fifth core block 5e, an annular oil passage is formed by four second through-passages 16b and four fifth through-passages 16e. As a result, the cooling oil that has flowed through the connecting oil passage 17b flows through the four second through-passages 16b and then through the four third through-passages 16c of the two third core blocks 5c that are stacked adjacent to the second core block 5b. Furthermore, at the boundary between the adjacent fourth core block 5d and the third core block 5c, an annular oil passage is formed by four fourth through-passages 16d and four third through-passages 16c. The cooling oil flowing through the annular oil passage formed by the fourth through-passages 16d and the third through-passages 16c is discharged to the outside from the first through-passage 16a of the first core block 5a into which the cooling oil flows, since the fourth through-passage 16d is connected to the first through-passage 16a.

[0053] Similarly, at the boundary between the second core block 5b and the adjacent fifth core block 5e, the four second through-passages 16b and the four fifth through-passages 16e form an annular oil passage. As a result, the cooling oil that has flowed through the connecting oil passage 17b flows through the four fifth through-passages 16e and then through the four third through-passages 16c of the two third core blocks 5c that are stacked adjacent to the fifth core block 5e. Furthermore, at the boundary between the adjacent fourth core block 5d and the third core block 5c, the four fourth through-passages 16d and the four third through-passages 16c form an annular oil passage. The cooling oil flowing through the annular oil passage formed by the fourth through-oil passage 16d and the third through-oil passage 16c is discharged to the outside from the first through-oil passage 16a of the first core block 5a, which is located on the opposite side of the first core block 5a from which the cooling oil flows, because the fourth through-oil passage 16d is connected to the first through-oil passage 16a.

[0054] When the stator core 1 is used as a motor, the temperature of the coils (not shown) increases due to the energization of the wound coils. When the coil temperature rises, the temperature of the entire motor rises, and the efficiency of converting electrical energy to mechanical energy decreases. Therefore, in a motor, it is necessary to circulate cooling oil through the through-oil passages 16 of the stator core 1 and exchange heat with the heat propagating through the stator core 1 to suppress the temperature rise of the motor. In order to efficiently suppress the temperature rise of the stator core 1, it is preferable to circulate the cooling oil throughout the entire circumferential direction of the stator core 1 and along the stacking direction. To achieve this, when multiple core blocks 5 are stacked, the through-oil passages 16 of each core block 5 must be connected in the circumferential direction to form an annular oil passage.

[0055] In the stator core 1 of this embodiment, an annular oil passage is formed by the second core block 5b and the fifth core block 5e, and the third core block 5c and the fourth core block 5d, and the cooling oil flowing through these annular oil passages is ultimately discharged from the first through-passage oil passage 16a. Therefore, the heat generated by energizing the coil (not shown) is transferred from the stator core 1 to the cooling oil for heat exchange, thereby suppressing the temperature rise of the motor including the stator core 1.

[0056] [Lamination of Cores That Cannot Be Rolled] As described above, the thickness of the core sheets 10 formed from rolled electrical steel sheets is not uniform and is non-uniform. In the core sheets 10 that can be rolled (third core sheet 10c, fourth core sheet 10d, and fifth core sheet 10e), the non-uniformity of the sheet thickness can be absorbed by rolling, suppressing the tilt of the core block 5 with respect to the central axis Z and leveling the height of the stator core 1. However, in the core sheets 10 that cannot be rolled (first core sheet 10a, second core sheet 10b), if they are laminated as is, the thicker parts of the sheets will overlap and the thinner parts will overlap, so there is a risk that the stator core 1 will tilt with respect to the central axis Z. For this reason, in the core sheets 10 that cannot be rolled, it is necessary to absorb the non-uniformity of the sheet thickness and suppress the tilt of the stator core 1 with respect to the central axis Z while laminating them without rolling. In the following section, we will describe a method for eliminating uneven thickness, using the first core sheet 10a as an example of a core sheet 10 that cannot be rolled. However, the following explanation is also applicable to the second core sheet 10b.

[0057] Specifically, two types of first core sheets 10a are manufactured, each having different locations of uneven plate thickness. One is a first forward core sheet 10a1 (an example of a B-type forward core sheet), as shown in Figure 7, for example, which has a relatively thick plate portion 19a around the fixing portion 14 closest to the first through-oil passage 16a near the outer edge of the first core sheet 10a, and a relatively thin plate portion 19b around the fixing portion 14 where the first recess 18a is formed. The other is a first reverse core sheet 10a2 (an example of a B-type reverse core sheet), as shown in Figure 8, for example, which has a relatively thin plate portion 19b around the fixing portion 14 closest to the first through-oil passage 16a near the outer edge of the first core sheet 10a, and a relatively thick plate portion 19a around the fixing portion 14 where the first recess 18a is formed.

[0058] When stacking the first forward core sheet 10a1 and the first reverse core sheet 10a2, the tilt of the stator core 1 with respect to the central axis Z is suppressed and the height is leveled by using one or both of the following two methods. In the following description, unlike the above embodiment, six first core sheets 10a constitute one first core block 5a.

[0059] The first method, as shown in Figure 9, involves laminating both the first forward core sheet 10a1 and the first reverse core sheet 10a2 when manufacturing a single first core block 5a. The first forward core sheet 10a1 and the first reverse core sheet 10a2 may be laminated alternately one at a time, as shown in Figure 9, or they may be laminated alternately with multiple sheets of the first forward core sheet 10a1 and the first reverse core sheet 10a2 at intervals. In Figure 9, the first core block 5a is composed of three first forward core sheets 10a1 and three first reverse core sheets 10a2. The number of first forward core sheets 10a1 and first reverse core sheets 10a2 constituting the first core block 5a is arbitrary, but it is preferable that the number of first forward core sheets 10a1 and the number of first reverse core sheets 10a2 are the same. This eliminates the unevenness in plate thickness of the entire first core block 5a (a single first core block 5a), allowing for the leveling of the height of the first core block 5a, and thus enabling the leveling of the height of the stator core 1 constructed using the height-leveled first core block 5a.

[0060] The second method, as shown in Figure 10, involves manufacturing one first core block 5a using multiple core sheets of only one type 10, and then stacking multiple (two in this embodiment) first core blocks 5a. Specifically, this method involves constructing a first forward core block 5a1 (an example of a B-type forward core block) by stacking six first forward core sheets 10a1, and constructing a first reverse core block 5a2 (an example of a B-type reverse core block) by stacking six first reverse core sheets 10a2, and then stacking the first forward core block 5a1 and the first reverse core block 5a2. The number of first forward core sheets 10a1 constituting the first forward core block 5a1 and the number of first reverse core sheets 10a2 constituting the first reverse core block 5a2 are arbitrary, but it is preferable that the number of first forward core sheets 10a1 and the number of first reverse core sheets 10a2 are the same. As a result, by combining multiple stacked first core blocks 5a (in Figure 10, one first forward core block 5a1 and one first reverse core block 5a2) to form a first core block 5a, the unevenness in the thickness of the core sheet 10 can be eliminated across the entire stacked first core block 5a, thereby leveling the height of the stator core 1.

[0061] [Other Embodiments] Embodiments of the present disclosure may be configured as follows in addition to the embodiments described above (those having the same functions as the embodiments described above are given the same numbers and reference numerals as the embodiments described above).

[0062] (1) In the above embodiment, one core block 5 is constructed by stacking three core sheets 10, but the number of core sheets 10 constituting one core block 5 may be one or more, two or less, or four or more.

[0063] (2) In the above embodiment, the core sheet 10 (core block 5) having an outer shape (contour) that is rotationally symmetrical n times with respect to the central axis Z was rolled over (360 / n) degrees (where n=4). However, it is also possible to roll over X・(360 / n) degrees (where X is a natural number), which is a multiple of (360 / n) degrees. The above embodiment is the case when X=1. When X is a natural number other than 1, it is preferable that the third recess 18c of the third core sheet 10c, the fourth recess 18d of the fourth core sheet 10d, and the fifth recess 18e of the fifth core sheet 10e are also formed at intervals of X・(360 / n) degrees, so that even after roll over, the third recess 18c, the fourth recess 18d, and the fifth recess 18e are located at the same locations on the multiple third core sheets 10c, fourth core sheet 10d, and fifth core sheet 10e.

[0064] (3) In the above embodiment, the first recess 18a to the fifth recess 18e constituting the recess 18 are all formed on the right side of the fixing portion 14, but the invention is not limited to this. The recess 18 may be formed on the side of another part of the fixing portion 14, or, as shown in Figure 11, on the side of the outer circumference of the core sheet 10 other than the fixing portion 14. When the recess 18 is formed on the side of the outer circumference of the core sheet 10 other than the fixing portion 14, the core sheet 10 may not have a fixing portion 14 and its outer shape (contour) may be circular, as shown in Figure 12. In this case, it is preferable that each of the recesses 18 be formed in a location that is close to each other when stacked. By doing so, the first recess 18a to the fifth recess 18e constituting the recess 18 can be viewed at once. This allows for a quick visual inspection of the stacking positions (stacking order) and number of stacks along the axial direction of each core block from the first core block 5a to the fifth core block 5e. Furthermore, the relative circumferential positional relationship between the first core block 5a and the second core block 5b, which have shapes that make them impossible to stack, can also be visually inspected. In other words, it is possible to quickly confirm whether the stator core 1 is a properly manufactured, good product or not.

[0065] (4) In the above embodiment, one first recess 18a and one second recess 18b are formed in one fixing portion 14 of the first core sheet 10a and the second core sheet 10b, respectively, and no other recesses 18 (third recess 18c, fourth recess 18d, and fifth recess 18e) are formed, but the embodiment is not limited to this. As shown in Figure 13, at least one of the third recess 18c, fourth recess 18d, and fifth recess 18e may be further formed in at least one of the fixing portion 14 of the first core sheet 10a in which one first recess 18a is formed, and the fixing portion 14 of the second core sheet 10b in which one second recess 18b is formed. In this case, at least one of the third recess 18c, fourth recess 18d, and fifth recess 18e formed in the fixing portion 14 of the first core sheet 10a and the second core sheet 10b is formed in all four fixing portions 14, as in the above embodiment.

[0066] In Figure 13, a third recess 18c is formed in each of the fixing portion 14 of the first core sheet 10a, which has one first recess 18a, and the fixing portion 14 of the second core sheet 10b, which has one second recess 18b. In other words, a total of two recesses 18 are formed in each of the fixing portion 14 of the first core sheet 10a, which has one first recess 18a, and the fixing portion 14 of the second core sheet 10b, which has one second recess 18b.

[0067] However, a total of three or more recesses 18 may be formed in each of the fixing portion 14 of the first core sheet 10a where the first recess 18a is formed and the fixing portion 14 of the second core sheet 10b where the second recess 18b is formed. In this case, the total of three or more recesses 18 may consist of two or more first recesses 18a or second recesses 18b, or two or more of any of the third recess 18c, fourth recess 18d, and fifth recess 18e. Alternatively, there may be one or more of two or more of the third recess 18c, fourth recess 18d, and fifth recess 18e.

[0068] (5) In the above embodiment, the first recess 18a to the fifth recess 18e were distinguished by having the same notch shape and varying the distance from the central axis Z, but the invention is not limited to this. For example, the first recess 18a to the fifth recess 18e may be distinguished by having different notch shapes or by having different numbers of notches per recess. With such configurations, even if the distance of the recess 18 from the central axis Z is the same, the stacking position (stacking order) and number of stacks along the axial direction of the first core block 5a to the fifth core block 5e can be visually confirmed, and the relative circumferential positional relationship between the first core block 5a and the second core block 5b, which have shapes that cannot be stacked, can also be visually confirmed at a glance.

[0069] (6) In the above embodiment, a first forward core sheet 10a1 and a first reverse core sheet 10a2 were used as examples to eliminate the unevenness in thickness and level the height of the core block 5 while stacking core sheets 10 which have uneven thickness and cannot be rolled, but the invention is not limited to this. Depending on the degree and location of the unevenness in thickness of the first core sheet 10a, three or more first core sheets 10a with different locations of thick plate portion 19a and thin plate portion 19b may be manufactured and stacked to eliminate the unevenness in thickness and level the height of the first core block 5a.

[0070] (7) In the above embodiment, only one second core block 5b and one fifth core block 5e were used, but the stator core 1 may be constructed by stacking multiple of at least one of these.

[0071] (8) In the above embodiment, since the fourth core block 5d and the fifth core block 5e are not stacked on a block-by-block basis, the three fourth core sheets 10d and the three fifth core sheets 10e are all stacked at 90 degrees, but this is not limited to this. When multiple fourth core blocks 5d and fifth core blocks 5e are used and stacking is performed on a block-by-block basis, it is not necessary to perform stacking on a sheet-by-sheet basis for one core block 5.

[0072] (9) In the above embodiment, a fixing portion 14 is formed on the outer edge of the core sheet 10 and the fixing portion 14 is used as the alignment portion during rolling, but the embodiment is not limited to this. Instead of the fixing portion 14, the teeth 12 of the core sheet 10 may be used as the alignment portion during rolling. In other words, the teeth 12 of the core sheet 10 (core block 5) are also included in the outer shape (contour). In this case, the number of teeth 12 is greater than the number of fixing portions 14, so the rolling angle is preferably a natural number multiple of twice or more the central angle with respect to the central axis Z. In this case, the alignment portion is composed of teeth 12 that are separated in groups, rather than adjacent teeth 12 in the circumferential direction.

[0073] (10) In the above embodiment, the stacking of the stator core 1 has been described, but the invention is not limited thereto. For example, the configuration in the embodiment of the present disclosure is also applicable to a rotor radially facing the stator core 1 in a motor. When the rotor is constructed by stacking stackable rotor cores and non-stackable rotor cores, by forming a recess 18 on the outer circumferential surface of the rotor core, the stacking position (stacking order) and the number of stacks along the axial direction of the rotor core can be determined, and furthermore, the relative circumferential positional relationship of the multiple non-stackable rotor cores can be determined.

[0074] (11) In the above embodiment, the first core sheet 10a and the second core sheet 10b each had one first recess 18a and one second recess 18b, but the embodiment is not limited to this. The number of notches in the first recess 18a and the second recess 18b may be two or more and the same number as or less than the number of the third recess 18c, the fourth recess 18d, and the fifth recess 18e. In this case, the number of notches in the first recess 18a and the second recess 18b does not have to be the same. In this case, the first recess 18a and the second recess 18b may be distinguished by making the distance from the central axis Z different from the distance from the central axis Z of the third recess 18c, the fourth recess 18d, and the fifth recess 18e. Alternatively, the notches of the first recess 18a and the second recess 18b may be distinguished from the notches of the third recess 18c, the fourth recess 18d, and the fifth recess 18e by having different shapes or by having different numbers of notches per location. By configuring in this way, the stacking positions (stacking order) and number of stacks along the axial direction of each of the first core block 5a to the fifth core block 5e can be visually confirmed, and the relative circumferential positional relationship between the first core block 5a and the second core block 5b, which have shapes that make them impossible to stack, can also be visually confirmed at a glance.

[0075] (12) If the number of notches in the first recess 18a and the second recess 18b is the same as (or more than the same as) the number of notches in the third recess 18c, the fourth recess 18d, and the fifth recess 18e, and the shape of the notches or the number of notches per location in the first recess 18a and the second recess 18b is different from that of the third recess 18c, the fourth recess 18d, and the fifth recess 18e, then the shape of all the notches in the first recess 18a and the second recess 18b, or the number of notches per location in the first recess 18a and the second recess 18b, is also different from that of the notches in the third recess 18c, the fourth recess 18d, and the fifth recess 18e. Furthermore, among the multiple notches of the first recess 18a and second recess 18b, some notches (for example, notches in areas visible during inspection) may have a different shape and number per location from the notches of the third recess 18c, fourth recess 18d, and fifth recess 18e, while the notches in other locations may have the same shape and number per location as the notches of the third recess 18c, fourth recess 18d, and fifth recess 18e.

[0076] Thus, any method can be employed as long as the notches of the first recess 18a and the second recess 18b are configured to be visually distinguishable from the notches of the third recess 18c, the fourth recess 18d, and the fifth recess 18e. The above embodiment and other embodiments (5), (11), and (12) are examples of a "second core mark different from the first core mark".

[0077] In each of the above embodiments, notches from the first recess 18a to the fifth recess 18e were provided as marks to identify the sheets. However, instead of, or in addition to, the notches from the first recess 18a to the fifth recess 18e, marks for confirming the stacking or marks for identifying the rows may be provided separately.

[0078] In the electromagnetic steel sheet laminate described in the above embodiment, the following configuration can be envisioned.

[0079] <1> One embodiment of the electromagnetic steel sheet laminate (1) comprises an A-type core block (5c, 5d, 5e) made of electromagnetic steel sheets, in which one or more A-type core sheets (10c, 10d, 10e) are laminated along the central axis (Z), and a B-type core block (5a, 5b) made of electromagnetic steel sheets, in which one or more B-type core sheets (10a, 10b) are laminated along the central axis (Z), wherein the A-type core block (5c, 5d, 5e) and the B-type core block (5a, 5b) are laminated in multiples along the central axis (Z) and integrated, and the A-type core block (5 The Type A core blocks (10c, 10d, 10e) and Type B core blocks (5a, 5b) have n rotational symmetries (where n is a natural number greater than or equal to 2) with respect to the central axis (Z) when viewed along the central axis (Z). On the sides of the Type A core sheets (10c, 10d, 10e), first marks (18c, 18d, 18e) are placed at intervals where the central angle with respect to the central axis (Z) is X・(360 / n) degrees. On the sides of the Type B core sheets (10a, 10b), second marks (18a, 18b) are placed that are different from the first marks (18c, 18d, 18e).

[0080] According to this embodiment, on the side surface of the A-type core block (5c, 5d, 5e), first marks (18c, 18d, 18e) are placed at intervals where the central angle with respect to the central axis (Z) is X・(360 / n) degrees, and on the side surface of the B-type core block (5a, 5b), second marks (18a, 18b) different from the first marks (18c, 18d, 18e) are placed. Therefore, for the A-type core block (5c, 5d, 5e), the first marks (18c, 18d, 18e) are placed in the same locations even after cross-section, and for the B-type core block (5a, 5b), second marks (18a, 18b) different from the first marks (18c, 18d, 18e) are placed. Therefore, by looking at the first marks (18c, 18d, 18e) and the second marks (18a, 18b), the stacking positions (stacking order) and number of stacks along the respective axial directions of the A-type core blocks (5c, 5d, 5e) and B-type core blocks (5a, 5b) can be confirmed (visually identified).

[0081] <2> In the electromagnetic steel sheet laminate (1) described in <1> above, one second mark (18a, 18b) is placed on each B-type core sheet (10a, 10b).

[0082] According to this embodiment, since one second mark (18a, 18b) is placed on each B-type core sheet (10a, 10b), the stacking position (stacking order) and number of stacks along the axial direction of each A-type core block (5c, 5d, 5e) and B-type core block (5a, 5b) can be confirmed (visually identified) with the minimum number of marks.

[0083] <3> In the electromagnetic steel sheet laminate (1) described in <1> or <2> above, the first marks (18c, 18d, 18e) are further arranged at positions different from the second marks (18a, 18b) on the side surface of the B-type core sheet (10a, 10b) at intervals where the central angle with respect to the central axis (Z) is X・(360 / n) degrees.

[0084] In this embodiment, the first marks (18c, 18d, 18e) are further positioned at locations different from the second marks (18a, 18b) on the side of the B-type core sheets (10a, 10b) at intervals where the central angle with respect to the central axis (Z) is X・(360 / n) degrees. This allows for the common manufacturing process for the A-type core sheets (10c, 10d, 10e) and the B-type core sheets (10a, 10b), while also enabling confirmation (visual inspection) of the stacking positions (stacking order) and number of stacks along the respective axial directions of the A-type core blocks (5c, 5d, 5e) and B-type core blocks (5a, 5b).

[0085] <4> In the electromagnetic steel sheet laminate (1) described in <1> or <2> above, the second marks (18a, 18b) are positioned in the same location as or near the first marks (18c, 18d, 18e) in the circumferential direction which is perpendicular to the central axis (Z).

[0086] According to this embodiment, the second marks (18a, 18b) of the B-type core blocks (5a, 5b) are positioned in the same location as or near the first marks (18c, 18d, 18e) of the A-type core blocks (5c, 5d, 5e) in the circumferential direction, which is perpendicular to the central axis (Z). Therefore, by looking at the second marks (18a, 18b), which are positioned differently from the first marks (18c, 18d, 18e), the first marks (18c, 18d, 18e), which are positioned in the same location or near the first marks, can be seen. Thus, by looking at the first marks (18c, 18d, 18e) and the second marks (18a, 18b), the stacking positions (stacking order) and number of stacks along the axial direction of the A-type core blocks (5c, 5d, 5e) and B-type core blocks (5a, 5b) can be seen.

[0087] <5> An electromagnetic steel sheet laminate (1) according to any one of <1> to <4> above, further comprising a C-type core block (5d, 5e) formed by laminating one or more C-type core sheets (10d, 10e) made of electromagnetic steel sheets and having a different shape from the A-type core sheet (10c) along the central axis (Z), wherein the C-type core blocks (5d, 5e) are laminated one or more times along the central axis (Z) and are integrated with a plurality of A-type core blocks (5c) and a plurality of B-type core blocks (5a, 5b), and the C-type core block (5d When viewed along the central axis (Z), the core blocks (5c) and (5a, 5b) have the same external shape as the A-type core blocks (5c) and the B-type core blocks (5a, 5b). On the side surface of the C-type core sheets (10d, 10e), third marks (18d, 18e) are placed at intervals where the central angle with respect to the central axis (Z) is X・(360 / n) degrees. The third marks (18d, 18e) are positioned in the same location as or near the first mark (18c) in the circumferential direction, which is perpendicular to the central axis (Z).

[0088] According to this embodiment, the third marks (18d, 18e) of the C-type core blocks (5d, 5e) are positioned at the same location as or near the first mark (18c) of the A-type core block (5c) in the circumferential direction, which is perpendicular to the central axis (Z). Therefore, the third marks (18d, 18e) and the first mark (18c) can be visually identified at a glance. As a result, by visually identifying the first mark (18c) and the third marks (18d, 18e), the stacking positions (stacking order) and number of stacks along the axial directions of the A-type core block (5c) and the C-type core blocks (5d, 5e) can be visually identified. In the above configuration, the A-type core sheet (10c) and C-type core sheets (10d, 10e) are used, but the embodiment is not limited to these. The core sheets may be type A (10d) and type C (10c, 10e), or type A (10e) and type C (10c, 10d).

[0089] <6> In the electromagnetic steel sheet laminate (1) described in any one of <1> to <5> above, the vicinity of the outer edge of the B-type core sheet (10a, 10b) has a thick plate portion (19a) with a relatively thick plate thickness and a thin plate portion (19b) with a relatively thin plate thickness, so the thickness of the B-type core sheet (10a, 10b) as a whole is uneven, and the B-type core sheet (10a, 10b) has a B-type sequential core sheet (10a1) in which a thick plate portion (19a) and a thin plate portion (19b) are formed at a predetermined location near the outer edge, and the B-type sequential core sheet (10a1 The B-type core block (5a, 5b) consists of at least two types of B-type inverted core sheets (10a2), in which a thin plate portion (19b) is formed where a thick plate portion (19a) is formed and a thick plate portion (19a) is formed where a thin plate portion (19b) is formed. The B-type core block (5a, 5b) is formed by stacking a B-type forward core sheet (10a1) and a B-type inverted core sheet (10a2) along the central axis (Z) to eliminate the unevenness in the thickness of the B-type core sheets (10a, 10b) and to equalize the overall height of the B-type core block (5a, 5b).

[0090] According to this embodiment, the unevenness of the plate thickness can be eliminated with a single B-type core block (5a, 5b), and the height of the B-type core blocks (5a, 5b) can be leveled. This allows for the leveling of the height of the electromagnetic steel sheet laminate (1) constructed using the B-type core blocks (5a, 5b) whose heights have been leveled.

[0091] <7> In the electromagnetic steel sheet laminate (1) described in any one of <1> to <5> above, the vicinity of the outer edge of the B-type core sheet (10a, 10b) has a thick plate portion (19a) with a relatively thick plate thickness and a thin plate portion (19b) with a relatively thin plate thickness, so the thickness of the B-type core sheet (10a, 10b) as a whole is uneven, and the B-type core sheet (10a, 10b) has a B-type sequential core sheet (10a1) in which a thick plate portion (19a) and a thin plate portion (19b) are formed at predetermined locations near the outer edge, and the B-type sequential core sheet (10a1) has a thin plate portion (19b) formed in the location where the thick plate portion (19a) is formed and a thick plate portion (19a) is formed in the location where the thin plate portion (19b) is formed. It consists of at least two types of B-type inverted core sheets (10a2), and has a B-type forward core block (5a1) made by stacking multiple B-type forward core sheets (10a1) as one B-type core block (5a, 5b), and has a B-type inverted core block (5a2) made by stacking multiple B-type inverted core sheets (10a2) as the other B-type core block (5a, 5b), and stacks the B-type forward core block (5a1) and the B-type inverted core block (5a2) along the central axis (Z), thereby eliminating the unevenness in the plate thickness of the B-type core sheets (10a, 10b) in the stacked B-type forward core block (5a1) and B-type inverted core block (5a2) and leveling the height.

[0092] According to this embodiment, one B-type core block (5a, 5b) is made up of multiple stacked B-type forward core sheets (10a1), and another B-type core block (5a2) is made up of multiple stacked B-type reverse core sheets (10a2). By stacking the multiple B-type forward core blocks (5a1) and B-type reverse core blocks (5a2), the overall thickness of the stacked multiple B-type forward core blocks (5a1) and B-type reverse core blocks (5a2) can be eliminated, thereby leveling the height of the electromagnetic steel sheet laminate (1).

[0093] This disclosure is applicable to laminated electrical steel sheets.

[0094] 1: Stator core (laminated electromagnetic steel sheet), 5a: First core block (Type B core block), 5a1: First forward core block (Type B forward core block), 5a2: First reverse core block (Type B reverse core block), 5b: Second core block (Type B core block), 5c: Third core block (Type A core block), 5d: Fourth core block (Type A core block, Type C core block), 5e: Fifth core block (Type A core block, Type C core block), 10a: First core sheet (Type B core sheet), 10a1: First forward core sheet (Type B forward core sheet) ), 10a2: First inverted core sheet (Type B inverted core sheet), 10b: Second core sheet (Type B core sheet), 10c: Third core sheet (Type A core sheet), 10d: Fourth core sheet (Type A core sheet, Type C core sheet), 10e: Fifth core sheet (Type A core sheet, Type C core sheet), 18a: First recess (Second mark), 18b: Second recess (Second mark), 18c: Third recess (First mark), 18d: Fourth recess (First mark, Third mark), 18e: Fifth recess (First mark, Third mark), 19a: Thick plate section, 19b: Thin plate section, Z: Central axis

Claims

1. An electromagnetic steel sheet laminate comprising: an A-type core block made of electromagnetic steel sheets, in which one or more A-type core sheets are stacked along a central axis; and a B-type core block made of the same electromagnetic steel sheets, in which one or more B-type core sheets are stacked along the central axis, wherein the A-type core block and the B-type core block are stacked in multiples along the central axis and integrated; the A-type core block and the B-type core block have a rotationally symmetrical shape with respect to the central axis n times (n is a natural number of 2 or more) when viewed along the central axis; a first mark is placed on the side surface of the A-type core sheet at intervals where the central angle with respect to the central axis is X・(360 / n) degrees; and a second mark different from the first mark is placed on the side surface of the B-type core sheet.

2. The electromagnetic steel sheet laminate according to claim 1, wherein one of the second marks is arranged on the B-type core sheet.

3. The electromagnetic steel sheet laminate according to claim 1 or 2, wherein the first marks are further arranged at positions different from the second marks on the side surface of the B-type core sheet, with the central angle with respect to the central axis being X・(360 / n) degrees.

4. The electromagnetic steel sheet laminate according to claim 1 or 2, wherein the second mark is located at the same position as or near the first mark in the circumferential direction which is perpendicular to the central axis.

5. The laminated electromagnetic steel sheet according to any one of claims 1 to 4, further comprising a C-type core block formed by stacking one or more C-type core sheets, each made of the electromagnetic steel sheet and having a different shape from the A-type core sheet, along the central axis, wherein one or more C-type core blocks are stacked along the central axis and integrated with a plurality of A-type core blocks and a plurality of B-type core blocks, the C-type core block has the same external shape as the A-type core block and the B-type core block when viewed along the central axis, and third marks are arranged on the side surface of the C-type core sheet at intervals where the central angle with respect to the central axis is X・(360 / n) degrees, and the third marks are arranged in the same position as or near the first marks in the circumferential direction which is perpendicular to the central axis.

6. The B-type core sheet has a thick plate portion with a relatively thick plate thickness and a thin plate portion with a relatively thin plate thickness near the outer edge, so that the thickness of the B-type core sheet as a whole is uneven, and the B-type core sheet consists of at least two types: a B-type forward core sheet in which the thick plate portion and the thin plate portion are formed at predetermined locations near the outer edge, and a B-type reverse core sheet in which the thin plate portion is formed at the locations where the thick plate portion of the B-type forward core sheet is formed, and the thick plate portion is formed at the locations where the thin plate portion is formed, and the B-type core block is formed by stacking the B-type forward core sheet and the B-type reverse core sheet along the central axis to eliminate the unevenness of the thickness of the B-type core sheet and to equalize the height of the B-type core block as a whole, according to any one of claims 1 to 5.

7. The vicinity of the outer edge of the B-type core sheet has a thick plate portion with a relatively thick plate thickness and a thin plate portion with a relatively thin plate thickness, so that the thickness of the B-type core sheet as a whole is uneven, and the B-type core sheet consists of at least two types: a B-type forward core sheet in which the thick plate portion and the thin plate portion are formed at predetermined locations near the outer edge, and a B-type reverse core sheet in which the thin plate portion is formed at the locations where the thick plate portion of the B-type forward core sheet is formed, and the B-type core block consists of a B-type forward core block formed by stacking multiple B-type forward core sheets, and the B-type core block consists of a B-type reverse core block formed by stacking multiple B-type reverse core sheets, The electromagnetic steel sheet laminate according to any one of claims 1 to 5, wherein the B-type forward core block and the B-type reverse core block are laminated along the central axis, thereby eliminating the unevenness of the plate thickness of the B-type core sheet in the entire laminated B-type forward core block and B-type reverse core block, and leveling the height.

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