Rotating electric machine stator, rotating electric machine, and method of manufacturing a rotating electric machine stator

Abstract

When assembling divided iron cores, there was a problem in that multiple positioning steps were required, which led to an increased number of steps and more complex facilities, thereby causing an increase in processing costs.　According to the present invention, when joining a first divided iron core and a second divided iron core together, a first protrusion of the first divided iron core and a second recess of the second divided iron core are brought close to each other in the circumferential direction and and made to contact each other in a state of having the first divided iron core and the second divided iron core be offset in the height direction, after which one or both of the first protrusion and the second recess are slid in the height direction, whereby a first groove portion of the first divided iron core and a second tenon portion of the second divided iron core are engaged with each other, and a first tenon portion of the first divided iron core and a second groove portion of the second divided iron core are engaged with each other.

Description

[Technical Field]

[0001] The present disclosure relates to a stator for a rotating electric machine, a rotating electric machine, and a method for manufacturing a stator for a rotating electric machine. [Background technology]

[0002] For example, Patent Document 1 discloses the following stator structure. In a stator in which a plurality of core segments are connected in a circular shape, each core segment having a back yoke portion connected in a circular shape and teeth portions protruding radially from the back yoke portion, the core segments are (1) A predetermined number of first core blanks are stacked to form a set, each having a first protrusion formed on one of the left and right connecting surfaces of the back yoke portion and a first recess formed on the other connecting surface into which the first protrusion can be inserted from the stacking direction, (2) A predetermined number of second core blanks are stacked to form a set, each having a second protrusion formed on one of the left and right connecting surfaces of the back yoke portion that can be inserted into the first recess of the first core blank from the stacking direction and the circumferential direction, and a second recess formed on the other surface that can receive both the first protrusion and the second protrusion of the first core blank from the stacking direction and the circumferential direction, Each set of first core blanks and second core blanks is stacked alternately in the stacking direction, and the stator is constructed by fitting the first convex portion of the first core blank in adjacent split cores with the first concave portion of the first core blank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 561339 Summary of the Invention [Problem to be solved by the invention]

[0004] In the stator described in Patent Document 1, when combining the split cores, the second protrusions are first fitted into the first recesses, and the second recesses are fitted into the first protrusions or second protrusions from the circumferential direction. At this time, if the radial positional relationship between each recess and protrusion is not adjusted, the recesses and protrusions will not fit together, making assembly impossible.

[0005] Furthermore, when the second protrusions are fitted into the first recesses, and the second recesses are fitted into the first protrusions or second protrusions in the circumferential direction, gaps are provided between the recesses and protrusions, so when fitting the first protrusions into the first recesses in the stacking direction, it is necessary to adjust the relative radial positions of the cores again. As such, the stator described in Patent Document 1 requires multiple positioning processes when assembling the core segments, which increases the number of steps, complicates the equipment, and increases processing costs.

[0006] The present disclosure has been made to solve the problems described above, and aims to provide a stator for a rotating electric machine that eliminates the need for multiple positioning steps when combining adjacent core segments, thereby reducing processing costs. [Means for solving the problem]

[0007] The stator of the rotating electric machine of the present disclosure has a back yoke portion having a shape obtained by dividing a ring in the circumferential direction. and The back yoke is formed by arranging a plurality of split cores, each consisting of a tooth portion protruding from the back yoke portion, in an annular shape. The split cores are formed on both ends of the back yoke portion and joined to adjacent split cores. The first joint portion has at least a first groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of one joint surface, and a second tenon portion formed in the height direction of the other joint surface. groove portion, first recess, second Tenon and a second joint portion in which a portion is formed, the first groove portion and the second tenon portion of the adjacent split core are engaged, the first protrusion portion and the first recess portion of the adjacent split core are in contact, and the first tenon portion and the second groove portion of the adjacent split core are engaged. Tei , th Tenon part 1and the second tenon portion is configured to be insertable into the first and second groove portions only from the height direction, and the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, The first tenon portion has a shape that includes the first protrusion portion when viewed from the height direction. It is characterized by: [Effects of the Invention]

[0008] According to the stator of the rotating electric machine disclosed herein, radial and circumferential positioning is performed by bringing the first convex portion and the first concave portion into contact, thereby eliminating the need for multiple positioning steps and reducing processing costs. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing a core segment according to the first embodiment. [Figure 2] FIG. 2 is a perspective view of the stator according to the first embodiment. [Figure 3] 1 is a perspective view of a rotating electric machine in which a stator and a rotor according to a first embodiment are combined. [Figure 4] 5 is an explanatory diagram of side surfaces where the core segments according to the first embodiment come into contact with each other. FIG. [Figure 5] 3A to 3C are diagrams illustrating the assembly of a stator using split cores according to the first embodiment. [Figure 6] 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] 6 is a cross-sectional view of FIG. 5 taken along line B-B. [Figure 8] 6 is a cross-sectional view taken along CC in FIG. 5. [Figure 9] FIG. 6 is a cross-sectional view taken along the line DD in FIG. 5. [Figure 10] 6 is a cross-sectional view of FIG. 5 taken along line E-E. [Figure 11] FIG. 10 is a perspective view showing a core segment according to a second embodiment. [Figure 12] 10A and 10B are diagrams illustrating the assembly of a stator using split cores according to the second embodiment. [Figure 13] 10A and 10B are diagrams illustrating the assembly of a stator using split cores according to the second embodiment. [Figure 14]FIG. 11 is a perspective view showing a core segment according to a third embodiment. [Figure 15] FIG. 11 is a plan view of a core segment according to a third embodiment. [Figure 16] FIG. 10 is a perspective view showing a core segment according to a fourth embodiment. [Figure 17] FIG. 10 is a plan view of a core segment according to a fourth embodiment. [Figure 18] FIG. 11 is a perspective view showing a core segment according to a fifth embodiment. [Figure 19] FIG. 13 is a perspective view showing a core coupler according to a sixth embodiment. [Figure 20] FIG. 13 is a perspective view showing a core coupler according to a sixth embodiment. [Figure 21] 13 is a diagram illustrating the assembly of a stator using a core coupler according to a seventh embodiment. FIG. [Figure 22] 13 is a diagram illustrating the assembly of a stator using a core coupler according to a seventh embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of a stator for a rotating electric machine according to the present disclosure will be described with reference to the drawings. The same components and corresponding parts are designated by the same reference numerals, and detailed descriptions thereof will be omitted. Similarly, in the following embodiments, redundant descriptions of components designated by the same reference numerals will be omitted.

[0011] Embodiment 1 Fig. 1 is a perspective view showing a core segment 1a constituting a stator according to embodiment 1. Fig. 2 is a perspective view of a stator 2 formed by combining a plurality of core segments 1a according to embodiment 1 in an annular shape. Fig. 3 is a perspective view showing a rotating electric machine 2B formed by combining the stator 2 and a rotor 2A.

[0012] Core segment 1a is constructed by cutting electromagnetic steel sheets into a predetermined shape using a press, wire processing machine, laser processing machine, or the like, and then stacking multiple cut electromagnetic steel sheets in order to a predetermined height. The surface corresponding to the circular surface of stator 2 in Figure 2, which is visible in Figures 1 and 2, is defined as the top surface of core segment 1a, the surface opposite the top surface, which is not visible in Figures 1 and 2, is defined as the bottom surface of core segment 1a, and the surface on which the striped laminated electromagnetic steel sheets can be seen is defined as the side surface. Core segment 1a is divided into a back yoke portion 3 on the outer diameter side of stator 2 and teeth portion 4 on the inner diameter side.

[0013] The back yoke portion 3 is the part that forms a circular ring when multiple core segments 1a are combined, and has a shape that divides the ring equally in the circumferential direction. The core segments 1a come into contact with each other on two circumferential ends, each with a different shape. The shape of these ends will be described in detail below.

[0014] On the left side of Figure 1, of the two ends where the core segments 1a come into contact, one end 5a1 has three different shapes formed, which, from the top side, are a dovetail groove portion (hereinafter referred to as groove portion) 6a1, a V-shaped protrusion portion (hereinafter referred to as protrusion portion) 7a1, and a dovetail tenon portion (hereinafter referred to as tenon portion) 8a1. The shapes are adjacent in the stacking direction (also referred to as the height direction, the same applies hereinafter), and in terms of size in the stacking direction, protrusion portion 7a1 is the largest, while groove portion 6a1 and tenon portion 8a1 are the same size in the stacking direction and are formed to be one size smaller than protrusion portion 7a1.

[0015] Groove 6a1 is recessed in a trapezoidal shape in the circumferential direction of one end 5a1, and the shape becomes smaller in the circumferential direction as it approaches the end. That is, the radial gap is smallest at the open end of the groove, and conversely, the bottom of the groove, which is the lower side of the recessed trapezoid, is configured as a dovetail groove where the radial gap is largest.

[0016] The protrusion 7a1 has a triangular shape that protrudes in the circumferential direction, and the shape is configured such that the radial size becomes smaller as it approaches the end in the circumferential direction.

[0017] The tenon portion 8a1 has a trapezoidal shape that protrudes circumferentially from one end 5a1, and is configured as a dovetail shape in which the radial size of the part of the circumferential end that corresponds to the lower side of the protruding trapezoid is the largest, and the radial size of the base part on the opposite side to the end that corresponds to the upper side of the protruding trapezoid is the smallest.

[0018] The other end 5a2 shown on the right side of Figure 1 also has three different shapes, which, from the top, are a dovetail portion (hereafter tenon portion) 8a2, a V-shaped recess (hereafter recess) 7a2, and a dovetail groove portion (hereafter groove) 6a2. The shapes are adjacent to each other in the stacking direction, and recess 7a2 is the largest in size in the stacking direction. Tenon portion 8a2 and groove portion 6a2 are the same size in the stacking direction, and are formed so that their shape is slightly smaller than recess 7a2.

[0019] Furthermore, the sizes of groove portion 6a1 and tenon portion 8a2, protrusion portion 7a1 and recess portion 7a2, and tenon portion 8a1 and groove portion 6a2 in the stacking direction are all configured to be the same. Note that there may be gaps between groove portion 6a1 and protrusion portion 7a1, and between protrusion portion 7a1 and tenon portion 8a1. Groove portion 6a1 and groove portion 6a2 have the same shape, and tenon portion 8a1 and tenon portion 8a2 also have the same shape, so explanations will be omitted.

[0020] The recess 7a2 has a triangular recessed shape in the circumferential direction, and its shape is configured so that the radial gap becomes smaller as it approaches the bottom of the recess. The recessed shape of the grooves 6a1, 6a2 in the circumferential direction matches the protruding shape of the tenon portions 8a1, 8a2 in the circumferential direction, so that when the grooves 6a1, 6a2 and the tenon portions 8a2, 8a1 are combined, there is no gap.

[0021] As described above, the grooves 6a1 and 6a2 are configured such that the radial gap becomes smaller in the circumferential direction toward the groove opening end and conversely, the radial gap becomes larger in the circumferential direction toward the groove bottom. Furthermore, the tenon portions 8a1 and 8a2 are configured such that the radial size becomes larger in the circumferential direction toward the tenon tip and conversely, the radial size becomes smaller in the circumferential direction toward the tenon base. Therefore, it is impossible to insert the tenon portions 8a1 and 8a2 into the grooves 6a1 and 6a2 from the circumferential direction, and it is also impossible to separate the combined grooves 6a1 and 6a2 and the tenon portions 8a2 and 8a1 by moving them circumferentially relative to each other.

[0022] The only combination possible is when the tenon portions 8a2, 8a1 are inserted into the grooves 6a1, 6a2 in the stacking direction. The triangular protruding shape of the convex portion 7a1 in the circumferential direction and the triangular recessed shape of the concave portion 7a2 in the circumferential direction match, so there is no gap when the convex portion 7a1 and the concave portion 7a2 are combined. However, there may be a gap as long as the magnetic resistance does not become too large.

[0023] The recessed portion 7a2 can be combined with the protruding portion 7a1 in either the circumferential direction or the stacking direction. The protruding portions of the tenon portions 8a1 and 8a2 are larger than the protruding portion of the protruding portion 7a1 in both the radial and circumferential directions. Details will be explained using Figure 4. Figure 4 is a top view of the protruding portion 7a1 superimposed on the tenon portions 8a1 and 8a2. The area of ​​the protruding portion 7a1 is clearly indicated by diagonal lines. The entire area of ​​the diagonal lines representing the protruding portion 7a1 is contained within the area of ​​the tenon portions 8a1 and 8a2. In this way, the protruding portions of the tenon portions 8a1 and 8a2 are not simply larger than the protruding portion 7a1, but are configured to encompass the protruding portion 7a1.

[0024] The teeth portion 4 shown in FIG. 1 is a portion that extends from near the circumferential center of the back yoke portion 3 toward the inner diameter direction of the stator 2. The side surface on the inner diameter side is arc-shaped, and both circumferential side surfaces are configured to be parallel to each other. At the point closest to the inner diameter, shoes 10 are provided on both sides, protruding in the circumferential direction from the parallel surfaces. The size of the shoes 10 is set so that when the split cores 1a are combined, there is a gap between the shoes 10 of adjacent split cores 1a.

[0025] Next, a method for manufacturing the core segments 1a will be described. The core segments 1a are formed by stacking three different types of electromagnetic steel sheets. The first type is a first electromagnetic steel sheet having grooves 6a1 and tenon portions 8a2, the second type is a second electromagnetic steel sheet having protrusions 7a1 and recesses 7a2, and the third type is a third electromagnetic steel sheet having tenon portions 8a1 and grooves 6a2. These are stacked in order to reach the required height in the stacking direction. In this case, three types of punching dies are required for the three types of electromagnetic steel sheets. For example, the first electromagnetic steel sheet having grooves 6a1 and tenon portions 8a2 and the third electromagnetic steel sheet having tenon portions 8a1 and grooves 6a2 are line-symmetrical, so the third electromagnetic steel sheet can be substituted by flipping the first electromagnetic steel sheet. In this case, only two types of punching dies are required, reducing processing costs.

[0026] Next, a method for assembling the stator 2 by combining the core segments 1a will be described with reference to Figures 5 to 10. Figure 5 shows the state in which the core segments 1b and 1c are pressed against each other in the circumferential direction while shifted in the lamination direction. The core segments 1b and 1c have the same shape as the core segment 1a, but for ease of explanation, they will be described as core segments 1b and 1c. Figures 6 to 10 are cross-sectional views taken along lines AA to EE shown in Figure 5. One end 5b1 of the core segment 1b and one end 5c2 of the core segment 1c are brought into contact in the circumferential direction while shifted in the lamination direction. At this time, the direction and amount of shifting must satisfy the following conditions (1) to (3). (1) As shown in the cross section BB in FIG. 7, the grooves 6b1 of the core segments 1b come into contact with the recesses 7c2 of the core segments 1c. (2) As shown in the CC cross section in Fig. 8 and the DD cross section in Fig. 9, the convex portions 7b1 of the core segments 1b come into contact with the concave portions 7c2 and groove portions 6c2 of the core segments 1c. At this time, they are pressed against each other from the circumferential direction, so a component force is generated in the direction that aligns the radial positions of the core segments 1b and 1c at the V-shaped tapered portions, completing radial positioning. (3) As shown in the AA cross section in FIG. 6 and the EE cross section in FIG. 10, the tenon portion 8b1 of the core segment 1b and the tenon portion 8c2 of the core segment 1c are not in contact with any other portion.

[0027] From this position, while maintaining their circumferential pressing, the core segments are moved in the opposite direction of the lamination direction, inserting groove 6b1 of core segment 1b into tenon 8c2 of core segment 1c, and tenon 8b1 of core segment 1b into groove 6c2 of core segment 1c, completing the assembly of core segment 1b and core segment 1c. When one or both of core segments 1b and 1c are slid in the lamination direction to fit groove 6b1 into tenon 8c2 and groove 6c2 into tenon 8b1, the radial positioning is already complete, and this state is maintained by the fit of protrusion 7b1 and recess 7c2. Therefore, grooves 6b1, 6c2, and tenon 8c2, 8b1 can be moved in the lamination direction without interference and can be fitted together as is. By repeating this process with adjacent core segments, stator 2 can be assembled, as shown in Figure 2. Thereafter, the rotor 2A is disposed on the stator 2, thereby assembling the rotating electric machine 2B shown in Fig. 3. Note that, in the second to fifth embodiments, the rotor 2A is disposed on the stator to assemble the rotating electric machine in the same manner.

[0028] This eliminates the need for a positioning process when combining adjacent core segments or the need to install a positioning mechanism in the assembly equipment, thereby suppressing increases in processing costs. Furthermore, because grooves 6b1, 6c2 and tenon portions 8c2, 8b1, and protrusions 7b1 and recesses 7c2 fit snugly together, no gaps occur between the core segments, preventing a decrease in the efficiency of the rotating electric machine. While snug fit between protrusions 7b1 and recesses 7c2 is desirable for suppressing increases in magnetic resistance, a gap between protrusions 7b1 and recesses 7c2 is acceptable as long as the increase in magnetic resistance is within an acceptable range.

[0029] According to the above configuration, when core segments 1b and 1c are assembled, when they are first pressed together circumferentially while shifted in the stacking direction, convex portions 7b1 of core segments 1b and concave portions 7c2 of core segments 1c come into contact. Therefore, even if core segments 1b and 1c are misaligned in the radial direction, a component force is generated in the pressing force between convex portions 7b1 and concave portions 7c2 in a direction that eliminates the radial misalignment. This allows them to be positioned relative to each other radially without an additional positioning step. Furthermore, since positioning in both the circumferential and radial directions is completed when they are pressed together circumferentially, simply shifting them in the stacking direction will allow groove portions 6b1 of core segments 1b and tenon portions 8c2 of core segments 1c to mate, and tenon portions 8b1 of core segments 1b and grooves 6c2 of core segments 1c to mate. This also eliminates the need for a positioning mechanism. In this way, when combining the core segments, no positioning mechanism is required, simplifying assembly equipment and reducing processing costs. Furthermore, when the core segments 1b and 1c are combined, the grooves 6b1 and tenon 8c2, the protrusions 7b1 and recesses 7c2, and the tenon 8b1 and grooves 6c2 fit together without any gaps. This eliminates gaps at the joints, preventing an increase in magnetic resistance and suppressing a decrease in the efficiency of the rotating electric machine. However, as mentioned above, a gap may exist between the protrusions 7b1 and recesses 7c2 as long as the increase in magnetic resistance is within an acceptable range.

[0030] Embodiment 2 FIG. 11 is a perspective view showing a core segment 1d according to the second embodiment, and FIGS. 12 and 13 are schematic diagrams showing a state where a plurality of core segments 1d are combined in an annular shape. When assembling a stator from the core segments 1a in embodiment 1, if the core segments 1a are combined one by one, when the last one is combined to form a circular ring shape, the core segments will interfere with each other, making the assembly more difficult. To avoid this, a configuration like core segment 1d shown in FIG. 11 can be used.

[0031] Core segment 1d differs from core segment 1a in the arrangement of three different shapes at both ends. One end 5d1 of core segment 1d has, from the top surface, a dovetail groove portion (hereinafter referred to as groove portion) 6d1, a V-shaped protrusion portion (hereinafter referred to as protrusion portion) 7d1, and a dovetail portion (hereinafter referred to as tenon portion) 8d1, while the opposite end 5d2 has, from the top surface, a dovetail groove portion (hereinafter referred to as groove portion) 6d2, a V-shaped recess portion (hereinafter referred to as recess portion) 7d2, and a dovetail portion (hereinafter referred to as tenon portion) 8d2. A stator can be assembled by combining core segment 1d with core segment 1e, which has a structure opposite to core segment 1d.

[0032] 11 to form core segment 1e, groove 6d1 and tenon 8d1 at one end 5d1 of core segment 1d are interchanged, and tenon 8e1, protrusion 7e1, and groove 6e1 are configured in this order from the top surface of end 5e1. Also, groove 6d2 and tenon 8d2 at the opposite end 5d2 are interchanged, and tenon 8e2, recess 7e2, and groove 8e1 are configured in this order from the top surface of end 5e2.

[0033] If the stator is made up of an even number of core segments, the stator can be assembled without interference by alternately combining core segments 1d and 1e as shown in Fig. 12. If the stator is made up of an odd number of core segments, the stator can be assembled smoothly without the core segments interfering with each other by incorporating only one core segment 1a in embodiment 1 and combining the rest with core segments 1d and 1e in embodiment 2 in the same way as when there is an even number of core segments, as shown in Fig. 13.

[0034] Embodiment 3 FIG. 14 is a perspective view showing a core segment 1f according to the third embodiment, and FIG. 15 is a plan view showing a core segment 1f according to the third embodiment. In the first and second embodiments, the components include a V-shaped convex portion and a V-shaped concave portion, but the components are not limited to a V-shape and may have any shape as long as a component force is generated in a direction that reduces the radial misalignment between the core segments at the contact points when the core segments are pressed against each other. For example, as shown in Figures 14 and 15, a circular convex portion 11 and a circular concave portion 12 may be used. With this shape, a component force is generated in a direction that reduces the radial misalignment between the core segments at the contact points when the core segments are pressed against each other.

[0035] Embodiment 4 FIG. 16 is a perspective view showing a core segment 1g according to the fourth embodiment, and FIG. 17 is a plan view showing the core segment 1g according to the fourth embodiment. In the first to third embodiments, the components include dovetail grooves and dovetails, but this is not limiting. Any shape may be used as long as it is larger than the L-shaped and circular protrusions, cannot be assembled or disassembled in the circumferential direction, and can be assembled in the stacking direction. For example, as shown in FIG. 16, the hook protrusions 13 and hook recesses 14 may extend in the circumferential direction and bend radially inward. Such shapes are larger than the L-shaped and circular protrusions, cannot be assembled or disassembled in the circumferential direction, and can be assembled in the stacking direction.

[0036] Embodiment 5 FIG. 18 is a perspective view showing a core segment 1h according to the fifth embodiment. Although it has been described that the two ends of the back yoke portion of the split core have three different shapes, four types are also acceptable. Specifically, one end 5h1 of the split core 1h may have, from the top surface, a dovetail groove portion (hereinafter, groove portion) 6h1, a dogleg recess (hereinafter, recess portion) 9h1, a dogleg protrusion (hereinafter, protrusion portion) 7h1, and a dovetail portion (hereinafter, tenon portion) 8h1, and the opposite end 5h2 may have, from the top surface, a dovetail portion (hereinafter, tenon portion) 8h2, a dogleg protrusion (hereinafter, protrusion portion) 7h2, a dogleg recess (hereinafter, recess portion) 9h2, and a dovetail groove portion (hereinafter, groove portion) 6h2. In this state, when the split cores are pressed against each other circumferentially while being shifted in the stacking direction, they should be shifted in the stacking direction so as to satisfy the following conditions: dovetail groove portion 6h1 contacts convex portion 7h2, concave portion 9h1 contacts convex portion 7h2 and concave portion 9h2, convex portion 7h1 contacts concave portion 9h2 and groove portion 6h2, and tenon portions 8h1 and 8h2 are not in contact with any parts.

[0037] In this case, four types of punching dies are required to manufacture the core segments 1h. However, by using an electromagnetic steel sheet with a dovetail groove and a dovetail groove, and an electromagnetic steel sheet with a V-shaped recess and a V-shaped protrusion, the number of punching dies required can be reduced to two, thereby reducing processing costs. Furthermore, because the protrusions 7h1 and 7h2 interfere with each other in the axial direction when shifted in the opposite direction from the direction of lamination, the axial retention strength provided by the recess 9h1 and tenon 8h2, and the recess 9h2 and tenon 8h1, can be further enhanced. The first through fifth embodiments described above can be freely combined, and any combination that satisfies the conditions described in each embodiment and does not create gaps at the joints between the core segments is acceptable. However, as mentioned above, gaps at the joints are acceptable as long as the increase in magnetic reluctance is within an acceptable range. Among these, when embodiment 2 and embodiment 5 are combined, the combined split cores have an axisymmetric structure, so there is no need to prepare split cores that are opposite in orientation, such as split core 1e for split core 1d in embodiment 2, resulting in the unique effect of being able to reduce the number of types of split cores.

[0038] Embodiment 6 FIG. 19 is a perspective view showing a coupling core 1i according to the sixth embodiment. The connection of each core segment described in the first to fifth embodiments can also be used when connecting only both ends of a connected core in which multiple teeth are connected. For example, the connected core 1i in Fig. 19 is connected by applying the structure of any of the first to fifth embodiments to only one circumferentially connected segment 15a. The remaining connected core segments are connected by a rotating segment 17.

[0039] As a structure for connecting the divided portions 15a, for example, as shown in Figure 1 of the first embodiment, one end of the divided portion 15a has three different shapes formed thereon, which are, from the top side, a groove, a protrusion, and a tenon. Similarly, the other end of the divided portion 15a has three different shapes formed thereon, which are, from the top side, a tenon, a recess, and a groove. The shapes are adjacent to each other in the stacking direction, and the sizes in the stacking direction of the convex portions and recesses are the largest, while the sizes in the stacking direction of the groove and tenon portions are equal, and the shapes are one size smaller than the convex portions and recesses.

[0040] With this configuration, as shown in Fig. 19, the connecting core 1i is elastically deformed, and the divided portions 15a are pressed from the circumferential direction while being shifted in the axial direction (see Fig. 5), and then assembly can be completed simply by moving them in the opposite direction to the shifted axial direction. This reduces the number of steps required for assembly and reduces processing costs.

[0041] In addition, in the case where the connection is not by the pivoting portion 17 of this embodiment, but by the thin-walled portion 16 shown in Figure 20, or by a member other than the iron core, such as an insulating member, it is also possible to apply embodiments 1 to 5 to the dividing portion 15b and join them.

[0042] Furthermore, when the connecting core is deformed and twisted into place while being displaced in the axial direction, the amount of axial displacement differs between the rotating connecting core shown in Fig. 19 and the thin-walled connecting core shown in Fig. 20 due to differences in the connecting structure. The thin-walled connecting core shown in Fig. 20 is connected by the core material, so there is no backlash and it is necessary to displace it by elastic deformation. In contrast, the rotating connecting core in Fig. 19 connects adjacent teeth with a concave-convex shape, so eye, It is possible to offset the backlash of the uneven parts, making it easier to twist-fit than thin-walled connecting cores.

[0043] Embodiment 7 21 and 22 are diagrams illustrating the assembly of a stator by combining multiple block-shaped cores in a circular ring shape. FIG. 21 shows the assembly of three-teeth block-shaped cores 1k. The arrangement of shapes formed at one end of block-shaped core 1k is different from the arrangement of cores 1i and 1j. That is, as described above, one end of the divided sections of cores 1i and 1j has grooves, protrusions, and tenons formed in that order from the top, similar to FIG. 1 of the first embodiment, while the other end of the divided sections has tenons, recesses, and grooves formed in that order from the top. In contrast, one end of block-shaped core 1k has grooves, protrusions, and tenons formed in that order from the top, while the opposite end has grooves, recesses, and tenons formed in that order from the top. The shapes are adjacent to each other in the stacking direction, and the size in the stacking direction of the convex and concave portions is the largest, while the size in the stacking direction of the groove and tenon portions is the same, but they are formed so that they are one size smaller than the convex and concave portions. Also, the three teeth that make up the block-shaped connecting core 1k are connected by rotation or thin-walled connections, just like in Figures 19 and 20.

[0044] When assembling a stator using an even number of block-shaped linked cores, the block-shaped linked cores 1k can be assembled without interference by assembling every other one upside down as shown in Fig. 21. However, when there is an odd number of blocks, interference occurs, so as explained in the second embodiment, by incorporating only one block-shaped linked core 1m having a structure opposite to that of the block-shaped linked core 1k as shown in Fig. 22, the stator can be assembled without the twist fit explained in the sixth embodiment.

[0045] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with a component of another embodiment.

[0046] Various aspects are summarized below as appendices.

[0047] (Appendix 1) In a stator for a rotating electric machine, the stator is configured by arranging a plurality of split cores in an annular shape, the split cores being made up of a back yoke section shaped like a ring divided in the circumferential direction and teeth protruding from the back yoke section, the back yoke section being formed at both end portions thereof, and the joining surfaces that join adjacent split cores include a first joining portion having at least a first groove, a first protrusion, and a first tenon formed in the height direction of one joining surface, and a second joining portion having a second groove, a first recess, and a second tenon formed in the height direction of the other joining surface, the first groove portion and the second tenon portion of the adjacent core segment are engaged, the first protrusion portion and the first recess portion of the adjacent core segment are in contact with each other without any gap, and the first tenon portion and the second groove portion of the adjacent core segment are engaged, A stator for a rotating electric machine, characterized in that the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion and the second tenon portion are larger in shape than the first convex portion in both the radial direction and the circumferential direction. (Appendix 2) 2. The stator of claim 1, wherein the first joint has a second recess that is continuous with the first protrusion in the height direction, the second joint has a second protrusion that is continuous with the first recess in the height direction, and the second recess of the core segment and the second protrusion of the adjacent core segment are in contact with each other without any gaps. (Appendix 3) 3. The stator of a rotating electric machine according to claim 1, wherein the first groove and the second groove are provided at opposite ends of the core segments in the height direction. (Appendix 4) 3. The stator of a rotating electric machine according to claim 1, wherein the first groove and the second groove are provided at ends of the core segments on the same side in the height direction. (Appendix 5) 3. The stator of a rotating electric machine according to claim 1 or 2, characterized in that it is configured by combining an odd number of split cores in which the first groove portion and the second groove portion are provided at ends on opposite sides in the height direction, and split cores in which the first groove portion and the second groove portion are provided at ends on the same side in the height direction. (Appendix 6) The stator of a rotating electric machine according to any one of appendixes 1 to 5, characterized in that the first and second groove portions have a trapezoidal recessed shape in the circumferential direction, the recessed shape being a dovetail groove shape configured so that the radial gap is smallest at the opening end of the groove corresponding to the upper side of the recessed trapezoid and largest at the bottom of the groove corresponding to the lower side of the recessed trapezoid, and the tenon portion has a trapezoidal protruding shape in the circumferential direction, the radial size of the portion of the circumferential end corresponding to the lower side of the protruding trapezoid is largest, and the radial size of the base portion corresponding to the upper side of the protruding trapezoid is smallest. (Appendix 7) A stator for a rotating electric machine according to any one of claims 1 to 5, characterized in that the first and second groove portions are formed in a hook shape relative to the circumferential direction, and the first and second tenon portions are also formed in a hook shape. (Appendix 8) The stator of a rotating electric machine according to any one of claims 1 to 7, characterized in that the first convex portion protrudes in a triangular shape in the circumferential direction, and the first concave portion is recessed in a triangular shape with the circumferential end portion as a base. (Appendix 9) The stator of a rotating electric machine according to any one of appendixes 1 to 7, characterized in that the first convex portion protrudes in a circular shape in the circumferential direction, and the first concave portion is recessed in a circular shape with the circumferential end portion as a base. (Appendix 10) In a stator for a rotating electric machine, the stator is configured by arranging a plurality of split cores in an annular shape, each split core consisting of a back yoke portion circumferentially divided into a ring and teeth projecting from the back yoke portion, the stator has a first joint portion formed at the end of the back yoke portion of a first split core, the first joint portion having at least a first groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of the joint surface that joins with an adjacent second split core, the second joint portion having a second groove portion, a first recess portion, and a second tenon portion formed on the joint surface facing the first joint portion of the second split core, the first groove portion and the second tenon portion engaging with each other, the first protrusion portion and the first recess portion contacting each other without any gap, and the first tenon portion engaging with the second groove portion, A stator for a rotating electric machine, characterized in that the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion and the second tenon portion are larger in shape than the first convex portion in both the radial direction and the circumferential direction. (Appendix 11) 11. A rotating electric machine comprising: a stator for a rotating electric machine according to any one of claims 1 to 10; and a rotor rotatably disposed opposite the stator with a gap therebetween. (Appendix 12) In a manufacturing method of a stator for a rotating electric machine in which core segments each consisting of a back yoke section formed by dividing a ring in the circumferential direction and teeth protruding from the back yoke section are arranged in a circular shape, the back yoke section has joint surfaces formed on both end portions of the back yoke section and joining adjacent core segments, the joint surfaces having at least a first groove section, a first protrusion section, and a first tenon section in the height direction of one joint surface, and a second joint surface having a second tenon section, a first recess section, and a second groove section in the height direction of the other joint surface, and the adjacent first and second core segments are arranged in a circular shape. a first core segment and a second core segment, the first convex portion of the first core segment and the second concave portion of the second core segment are brought close to each other in the circumferential direction and brought into contact with each other while the first core segment and the second core segment are shifted in the height direction, and then one or both of the second concave portion and the first convex portion are slid in the height direction to engage the first groove portion of the first core segment with the second tenon portion of the second core segment, and to engage the first tenon portion of the first core segment with the second groove portion of the second core segment. [Explanation of symbols]

[0048] 1a to 1h: split cores, 1i, 1j, 1k, 1m: connecting cores, 2: stator, 2A: rotor, 2B: rotating electric machine, 3: back yoke portion, 4: teeth portion, 6a1, 6a2, 6b1, 6c2, 6d1, 6d2, 6e1, 6h1, 6h2: groove portions, 7a1, 7b1, 7d1, 7e1, 7h1, 7h2: convex portions, 8a 1, 8a2, 8b1, 8c2, 8e1, 8e2, 8d1, 8d2, 8h1, 8h2: tenon portion, 7a2, 7d2, 7c2, 7e2, 9h1, 9h2: recess, 10: shoe, 11: circular convex portion, 12: circular recess, 13: hook convex portion, 14: hook recess, 15a, 15b: dividing portion, 16: thin portion, 17: rotating portion.

Claims

1. In a stator for a rotating electric machine, the stator is configured by arranging a plurality of split cores in an annular shape, the split cores being made up of a back yoke section shaped like a ring divided in the circumferential direction and teeth protruding from the back yoke section, the stator having joining surfaces formed on both end portions of the back yoke section and joining adjacent split cores, the stator having a first joining portion in which at least a first groove, a first convex portion, and a first tenon portion are formed in the height direction of one joining surface, and a second joining portion in which a second groove, a first concave portion, and a second tenon portion are formed in the height direction of the other joining surface, the first groove portion and the second tenon portion of the adjacent core segment are engaged, the first protrusion portion and the first recess portion of the adjacent core segment are in contact, and the first tenon portion and the second groove portion of the adjacent core segment are engaged, A stator for a rotating electric machine, characterized in that the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion has a shape that encompasses the first convex portion when viewed from the height direction.

2. 2. The stator of claim 1, wherein the first joint has a second recess that is continuous with the first protrusion in the height direction, the second joint has a second protrusion that is continuous with the first recess in the height direction, and the second recess of the core segment and the second protrusion of the adjacent core segment are in contact with each other.

3. 3. The stator of claim 1, wherein the first groove and the second groove are provided at opposite ends of the core segments in the height direction.

4. 3. The stator of claim 1, wherein the first groove and the second groove are provided at ends of the core segments on the same side in the height direction.

5. 3. The stator of a rotating electric machine according to claim 1, characterized in that it is constructed by combining an odd number of split cores in which the first groove portion and the second groove portion are provided at ends on opposite sides in the height direction, and split cores in which the first groove portion and the second groove portion are provided at ends on the same side in the height direction.

6. 3. The stator of a rotating electric machine according to claim 1 or 2, characterized in that the first and second groove portions have a trapezoidal recessed shape in the circumferential direction, the recessed shape being a dovetail groove shape configured so that the radial gap is smallest at the opening end of the groove corresponding to the upper side of the recessed trapezoid and largest at the bottom of the groove corresponding to the lower side of the recessed trapezoid, and the tenon portion has a trapezoidal protruding shape in the circumferential direction, the radial size of the portion of the circumferential end corresponding to the lower side of the protruding trapezoid is largest, and the radial size of the base portion corresponding to the upper side of the protruding trapezoid is smallest.

7. 3. The stator of a rotating electric machine according to claim 1, wherein the first and second groove portions are formed in a hook shape relative to the circumferential direction, and the first and second tenon portions are also formed in a hook shape.

8. 3. The stator of claim 1, wherein the first protrusion protrudes in a triangular shape in the circumferential direction, and the first recess is recessed in a triangular shape with the circumferential end as a base.

9. 3. The stator of claim 1, wherein the first protrusion protrudes in a circular shape in the circumferential direction, and the first recess is recessed in a circular shape with the circumferential end portion as a base.

10. In a stator for a rotating electric machine, the stator is configured by arranging a plurality of split cores in an annular shape, the split cores being made up of a back yoke section circumferentially divided into a ring and teeth protruding from the back yoke section, the stator having a first joint section formed at an end of the back yoke section of a first split core, the first joint section having at least a first groove section, a first protrusion section, and a first tenon section in the height direction of the joint surface that joins with an adjacent second split core, the second joint section having a second groove section, a first recess section, and a second tenon section formed on the joint surface facing the first joint section of the second split core, the first groove section and the second tenon section engaging with each other, the first protrusion section and the first recess section contacting each other, and the first tenon section and the second groove section engaging with each other, A stator for a rotating electric machine, characterized in that the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion has a shape that encompasses the first convex portion when viewed from the height direction.

11. A stator for a rotating electric machine is configured by arranging a plurality of coupled cores, each of which is made up of a back yoke portion and teeth protruding from the back yoke portion, and rotatably connecting the coupled cores by providing a rotating portion on the back yoke portion to form a coupled core, the stator having a first joint portion formed at one end of the coupled core and having at least a first groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of the joint surface that joins with the adjacent coupled core, and a second joint portion formed at the other end of the coupled core and having at least a second groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of the joint surface that joins with the adjacent coupled core. a second joint portion on which a second tenon portion is formed, wherein the first groove portion and the second tenon portion are engaged with each other, the first convex portion and the first concave portion are in contact with each other, the first tenon portion and the second groove portion are engaged with each other, the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion has a shape that includes the first convex portion when viewed from the height direction.

12. A stator for a rotating electric machine is configured by arranging a plurality of split cores, each consisting of a back yoke portion and teeth protruding from the back yoke portion, and by connecting the split cores to each other to form a linked core, the linked cores having a first joint portion formed at one end of the linked core and having at least a first groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of the joint surface that joins with the adjacent linked core, and a second joint portion formed at the other end of the linked core and having at least a second groove portion, a first recess portion, and a second tenon portion formed in the height direction of the joint surface that joins with the adjacent linked core. a second joint portion on which two tenon portions are formed, the first groove portion and the second tenon portion are engaged, the first convex portion and the first concave portion are in contact, the first tenon portion and the second groove portion are engaged, the first tenon portion and the second tenon portion are configured to be insertable into the first and second groove portions only from the height direction, the first convex portion is configured to be insertable into the first concave portion from either the height direction or the circumferential direction, and the first tenon portion has a shape that includes the first convex portion when viewed from the height direction.

13. 13. A rotating electric machine comprising: the stator of claim 1; and a rotor rotatably disposed opposite the stator with a gap therebetween.

14. In a manufacturing method of a stator for a rotating electric machine in which split cores each consisting of a back yoke portion shaped by dividing a circle in the circumferential direction and teeth projecting from the back yoke portion are arranged in a circular shape, the back yoke portion has joint surfaces formed on both side ends thereof and joined to adjacent split cores, the joint surfaces having at least a first groove portion, a first protrusion portion, and a first tenon portion formed in the height direction of one joint surface, and a second tenon portion, a first recess portion, and a second groove portion formed in the height direction of the other joint surface, the first tenon portion having a shape that includes the first protrusion portion when viewed from the height direction, and the first tenon portion having a shape that includes the first protrusion portion when viewed from the height direction, and the second ... a first core segment and a second core segment, the first core segment and the second core segment being joined together, the first convex portion of the first core segment and the first concave portion of the second core segment being brought closer to each other in the circumferential direction while the first core segment and the second core segment are shifted in the height direction, and then one or both of the first concave portion and the first convex portion are slid in the height direction to engage the first groove portion of the first core segment with the second tenon portion of the second core segment, and to engage the first tenon portion of the first core segment with the second groove portion of the second core segment.

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