JP5672174B2 - Rotating electric machine stator core - Google Patents

Description

  The present invention relates to a stator core of a rotating electrical machine constituted by stacking core plates obtained by connecting divided core plate pieces in an annular shape, and more particularly to the configuration of the core plate pieces formed by stamping.

  In general, the core plate of a stator core of a rotating electrical machine is formed by connecting a plurality of fan-shaped core plate pieces (divided pieces) in the circumferential direction in consideration of material removal when a hoop material is formed by punching with a press. Formed. Conventionally, the divided core plate pieces have the same shape having a fixing part (ear) for connection / attachment at the center in the circumferential direction, and these core plate pieces are connected in the same plane in the circumferential direction to form an annular shape. At the same time, a stator core is formed by laminating a large number of the annular core plates in the axial direction by passing bolts through the fixing portions (ears) at the same position (see Patent Document 1).

  In addition, it is also known that when the concave and convex portions are formed on the core plate piece and the annular core plates are stacked, the concave and convex portions are engaged and integrally connected by dowel crimping (Patent Document 2). reference).

JP 2003-199302 A (see FIG. 1) JP 2010-68569 A

  Since the core plate composed of the core plate pieces having the same shape is connected by a fixing portion (ear) located in the central portion in the circumferential direction, the joint position of each annular core plate is the same position in the stacking direction, and the stator core Is not strong enough. Further, when each stator core piece is punched from the hoop material, each stator core piece is formed with a fixed portion protruding on the outer peripheral side of the central portion in the circumferential direction, and therefore it is necessary to take material so that the respective fixed portions do not interfere with each other. And the yield cannot be increased sufficiently.

In order to solve the above-described problem, the present applicant, as shown in FIG. 7, fixes the first core plate piece 3a having the fixing portion (ear) 2a on the one end side in the circumferential direction and the other end side in the circumferential direction. The stator core 5 which consists of the 2nd core plate 3b which has the part 2b was proposed (Japanese Patent Application No. 2010-282382; unpublished at the time of this-application application). The stator core 5 includes a first core plate 6 formed by connecting a plurality (three) of first core plate pieces 3a in an annular shape, and a plurality (three) of second core plate pieces 3b. The second core plate 7 formed by connecting in an annular shape is configured by, for example, being alternately stacked so that the fixing portions (ears) 2a and 2b are aligned in the axial direction. Therefore, the first core plate 6 and the second core plate 7 are different from each other in the seam position of the core plate pieces 3a and 3b in the stacking direction, and the adjacent core plates 6 and 7 are viewed in plan view (from the axial direction). See) Laminated so as to partially overlap in the circumferential direction (called brick masonry). Thereby, since the joints D ₁ and D _{2 of the} core plates 6 and 7 adjacent to each other in the stacking direction are displaced in the circumferential direction, the stator core 5 can be improved in strength.

  Further, as shown in FIG. 7 (a), when the first and second core plate pieces 3a and 3b are punched from the hoop material 1, the fixing portions 2a and 2b are positioned at the end portions in the circumferential direction. These fixed portions 2a and 2b are positioned on the outer side in the circumferential direction of the end portion of the adjacent core plate piece on the outer peripheral side, and the fixed portions 2a and 2b are prevented from interfering with the adjacent core plate piece, The distance between the core plate pieces can be reduced, and punching can be performed with a high yield due to the die. The three first core plate pieces 3a forming one core plate 6 and the three second core plate pieces 3b forming the same core plate 7 are one by three. As a set, it is preferable that the hoop material 1 is punched alternately.

Each of the core plates 6 and 7 of the stator core 5 is a dowel having a concave and convex shape (for example, concave on the front side and convex on the back side) by pressing the yoke part 10 connected in the circumferential direction on the outer peripheral side of the tooth part 9 at equal intervals. 11 is formed. Each of the core plate pieces 3a and 3b having three divisions has a fan shape of 120 degrees, the dowels 11 are set on each of the core plates 3a and 3b in six equal parts, and the seams D ₁ and D ₂ adjacent in the stacking direction are For example, if it is set to be shifted in the circumferential direction of 23 ° 20 ′, the interval between the joints D ₁ -D ₂ becomes an overlapping portion c. On the other hand, the dowels 11 are positioned on the center line F of the fixed portion (ear) and are formed at equal intervals every 20 °. According to such a design, the angle from the end A on the side without the fixing portions 2a and 2b of the core plate pieces 3a and 3b to the first dowel 11a is 8 ° 20 ′, and the end on the side with the fixing portion The angle from B to the first dowel 11b is 11 ° 40 ′, and the position of the dowel 11 is determined by the first core plate piece 3a and the second core plate piece 3b in the progressive press die machining from the hoop material 1. Are not aligned, and the first core plate piece 3a and the second core plate piece 3b need to be subjected to dowel processing using different molds, and the pressing of the core plate piece is troublesome and causes an increase in cost.

  Therefore, the present invention solves the above-described problems by setting dowels on the core plate pieces at positions where the first core plate pieces and the second core plate pieces can be doweled by the same press die. It aims at providing the stator core of a rotary electric machine.

In the present invention, core plate pieces (23a, 23b) having fixing portions (22a, 22b) projecting to the outer periphery and having the circumference divided equally are connected in an annular shape in the circumferential direction. 26, 27) and a plurality of dowels (31) are formed at equal intervals on the core plate piece, and the core plate (26, 27) is aligned with the fixing portion (22a, 22b) in the axial direction. In addition, in the stator core (25, 25 ₁ ...) Of a rotating electrical machine formed by engaging a plurality of the dowels and fixing them,
The core plate piece has a first core plate piece (23a) in which the fixing portion (22a) is formed at one end portion in the circumferential direction, and the fixing portion (22b) is formed in the other end portion in the circumferential direction. The second core plate piece (23b),
The plurality of first core plate pieces (23a) are connected in the circumferential direction to form an annular first core plate (26), and the plurality of second core plate pieces are connected in the circumferential direction. Forming an annular second core plate (27),
The first core plate (26) and the second core plate (27) are laminated such that the seams (D ₁ , D ₂ ) of the core plate pieces of the core plates are shifted in the circumferential direction. seam (D ₂₎ overlapped portion is the distance up to the seam from said (D ₁₎ second core plate (27) of the in the circumferential direction the first core plate (26) of the plate center line of (c) ( F) are stacked on each other so that the fixing parts (22a, 22b) are positioned on
When the angle of the core plate pieces (23a, 23b) is a, the angle of the overlapping portion is c, and the number of the dowels (31) of each core plate piece is k,
c = N · a / k where N = natural number (not including 0) , N <k
Satisfy the relationship
This is a stator core for a rotating electrical machine.

  Preferably, N is an odd number.

  More preferably, the N is 1.

  In addition, although the code | symbol in a parenthesis is for contrast with drawing, it does not have any influence on the structure of a claim by this.

  According to the first aspect of the present invention, the first core plate made of the first core plate piece having the fixing portion at one end in the circumferential direction and the second core plate piece having the fixing portion at the other end in the circumferential direction. Since the stator core is formed by laminating the second core plate, the seam of the first core plate and the second core plate is shifted in the circumferential direction, and the strength of the stator core can be improved. When the first and second core plate pieces are punched from the hoop material, the dowels of the first and second core plate pieces can be in the same phase while improving the material yield. Can be performed by a common press, and the cost of the press progressive type manufacturing apparatus can be reduced and the efficiency of manufacturing the stator core can be improved. The fixing portion is positioned at the center of the overlapping portion between the first core plate and the second core plate, and the dowel is positioned at the overlapping portion, so that the core plates are stacked and fixed securely and firmly. be able to.

  According to the second aspect of the present invention, since the dowel is located on the center line of the fixed portion, the dowel crimping can be ensured and a robust stator core can be obtained.

  According to the third aspect of the present invention, since there is only one dowel located in the overlapping portion on the center line of the fixed portion, the phase and number of dowels are made appropriate to balance manufacturing cost and strength. An excellent stator core can be obtained.

The stator core which can apply this invention is shown, (a) is a top view which shows the process of the stator core piece by a press progressive feed type | mold, (b) is a perspective view which shows the assembly. The embodiment of this invention is shown, (a) is a top view which shows the process of each core plate piece, (b) is a top view of a core plate. An embodiment which changed partially is shown, (a) is a top view showing processing of each core plate piece, and (b) is a top view of a core plate. The other embodiment of this invention is shown, (a) is a top view of a core plate, (b) is a top view which shows the process of each core plate piece. The other embodiment of this invention is shown, (a) is a top view of a core plate, (b) is a top view which shows the process of each core plate piece. The reference example which cannot carry out dowels with the same type is shown, (a) is a top view of a core plate, (b) is a top view showing processing of each core plate piece. The background art of this invention is shown, (a) is a top view which shows the process of each core plate piece, (b) is a top view of a core plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the stator core 25 of the rotating electrical machine includes a plurality of core plate pieces 23 a and 23 b that have fixing portions 22 a and 22 b that protrude to the outer periphery and are divided equally into the circumference. The core plate piece includes a first core plate piece 23a in which a fixing portion (ear) 22a is formed at an end portion on one side in the circumferential direction, and a fixing portion 22b in which an end portion on the other side in the circumferential direction is formed. 2 core plate pieces 23b. The first and second core plate pieces 23a, 23b have a sector shape of 120 °, and a plurality of teeth portions 29 are formed on the inner peripheral side, and the yoke portion 30 is continuous on the outer peripheral side. By connecting these three first core plate pieces 23a in the circumferential direction, an annular first core plate 26 is formed, and by connecting the three second core plate pieces 23b in the circumferential direction, An annular second core plate 27 is formed. Each of the core plate pieces 23a and 23b has a protrusion 35 formed at one end in the circumferential direction and a groove 36 formed at the other end, and is connected by engaging the protrusion 35 and the groove 36 in a dovetail shape. The

  The hoop material 1 is provided with pyrod holes 39, and three first core plate pieces 23a are continuously formed by pressing while being positioned in the pyrod holes 39 and sequentially fed. The second core plate pieces 23b are continuously formed by pressing. At this time, the fixing portions (ears) 22a and 22b formed on the outer peripheral sides of the core plate pieces 23a and 23b are either one of the left and right ends in the circumferential direction of the adjacent core plate pieces on the upstream side in the hoop material feeding direction E. The core plate pieces are not interfered with each other and can be formed by punching with a space between the respective core plate pieces, thereby improving the material yield.

  The fixing portions 22a of the three first core plate pieces 23a (assumed to be odd-numbered layers) are located at the left end in the traveling direction E of the hoop material 1, and the three second core plate pieces 23b. The fixing portion 22b (assumed to be an even number layer) is located at the right end in the traveling direction E of the hoop material. Further, when the core plate pieces 23a and 23b are formed by the press progressive die, the dowel 31 having one surface recessed and the other surface convex is simultaneously formed in the yoke portion 30.

The first core plate 26 formed in an annular shape by the three first core plate pieces 23a for the odd number layers and the annular shape formed by the three second core plate pieces 23b for the even number layers. A plurality of second core plates 27 are alternately stacked with the fixing portions 22a and 22b aligned in the axial direction (brick stacking), and the overlapping dowels 31 are caulked (dumped) to form a plurality of sheets in the stacking direction. Are integrally fixed to form the stator core 25. Therefore, the stator core 25, the first (odd-numbered layers) core plate 26 adjacent in the stacking direction to each other, the seam D ₁ of the respective core plate pieces 23a, each of the core plates in the second core plate 27 (even-numbered layers) the seam D ₂ pieces 23b, are arranged Te predetermined angle c deviation, between the seam D ₁ -D ₂ is a overlap in odd layer and even-numbered layers in a plan view, and heavy becomes part c (the seam D the fixed portion 22a at the center of _one interval -D _2), 22b are located. The aligned fixed portion 22a, but is fixed to the housing or the like through a bolt into a hole of the 22b, the core plates 27 of the core plate 26 and an even layer of the odd-numbered layers are overlapped in the seam D ₁ -D ₂ parts, In addition, since the fixing portions 22a and 22b of the overlapping portion c are fixed, the strength of the stator core 25 is improved.

Next, setting of the position of the dowel 31 of each of the core plate pieces 23a and 23b will be described with reference to FIG. The first core plate pieces 23a and the fixed portion 22a of the second core plate pieces 23b of the stator core 25 _1, the angle from the end surface A of the 22b side to the center line F of the fixed portion is set to 12 °, and the The first dowel 31b is formed on the center line F. Similarly, the dowel 31a is set at a position of 12 ° from the end face B on the side where the first and second core plate pieces 23a, 23b are not fixed. That is, the three core plate pieces 23a and 23b are joined at their circumferential end faces to form a first (odd layer) core plate 26 and a second (even layer) core plate 27. Since the second core plates 26 and 27 are laminated with the fixing portions 22a and 22b aligned, the distance (overlapping portion) c between the seams D _{1 to} D ₂ of the odd-numbered and even-numbered core plates 26 and 27 is 24 °. Thus, the distance from the end surface A to the dowel 31b on the center line F of the fixed portion and the first dowel 31a on the side having no fixed portion from the end surface B is 12 °. Since five dowels 31 are formed at equal intervals on the annular core plates 26 and 27, the dowels 31 are formed on the core plate pieces 23a and 23b at intervals of 24 ° except for the dowels 31a and 31b at both ends. Is done. On the other hand, each of the core plate pieces 23a and 23b is divided into three equal parts on the entire circumference, and thus has a 120 ° sector shape.

When the overlap amount D ₁ -D ₂ = c (24 °) of the seam is set to 1 / N (reciprocal of the natural number N) of the angle a (120 °) of each core plate piece 3a, 3b, the first And the phase of the dowel 31 in the 2nd core plate piece 23a, 23b becomes the same.

a / c = N
a is an angle of each core plate piece, c is an overlapping amount (angle) of the first and second core plates, N is a natural number, but 0 is not included in the natural number.

  Here, since the first dowel 31b is located on the center line F of the fixing portions 10a and 10b located at the center of the overlapping portion c, and only one dowel is arranged in the overlapping portion c, The interval e between the dowels 31 and 31 adjacent in the circumferential direction of the core plates 26 and 27 is equal to the overlap amount (c = e), and the interval e is also a natural number of the angle a of the core plate piece (e = a / N), and the dowels 31a and 31b at both ends have the same phase with the angle from the end faces A and B being 1/2 (c / 2) of the dowel interval e.

  Accordingly, as shown in FIG. 2A, the first core plate piece 23a and the second core plate piece 23b can form dowels 31 (including dowels 31a and 31b at both ends) in the same phase. In the press progressive die processing, the dowels 31 can be processed into the first and second core plate pieces 23a and 23b with the same die.

  That is, the number k of the dowels 31 formed by equally dividing the core plate pieces 23a and 23b is naturally a natural number, and the value obtained by dividing the angle a of each core plate piece by the dowel number k is the first and The overlapping amount (corner) c of the second core plates 26 and 27 is set.

c = a / k k; dowel number (natural number)
The above equation [c = a / k] is based on the assumption that one dowel 31 (one dowel on the center line F) is located in the overlapping portion c. Since two or more overlapping portions c can be formed, the above formula is
c = N · a / k (N is a natural number) , N <k
And can be generalized. When N is a multiple of 2 and 2, the dowel is not located on the center line F of the fixed part, but when the dowel is located at the center of the fixed part, the above formula is
c = Nodd · a / k [(Nodd) is an odd number]
It becomes.

FIG. 3 shows a partially modified embodiment. This stator core 25 ₂ overlaps part c of both seam between the first core plate 26 and the second core plate 27 is set to 20 °, each core plate pieces 23a, 23b from the fan angle a of 120 ° And six dowels 31 (k = 6) are formed on each core plate piece. The stator core itself is the same as that of the embodiment shown in FIGS. 1 and 2 except that the overlapping portion and the number of dowels are different. Therefore, the same portions are denoted by the same reference numerals and the description thereof is omitted.

  Therefore, in the above formula [c = N · a / k], a = 120, k = 6, and there is one hole in the overlapping portion c, so N = 1, and the overlapping portion c is 20 (degrees), The core plate pieces 23a and 23b satisfy the above formula. As shown in FIG. 3B, the core plate pieces 23a and 23b are arranged in parallel to the hoop material 1 so that the respective core plate pieces 23a and 23b are orthogonal to the feed direction. In this case, the dowels of the first and second core plate pieces 23a and 23b are in the same phase and can be doweled by the same die. In addition, it is preferable to form end surface A and B used as the joint of each core plate piece in the groove | channel center of the teeth part 29. Therefore, the overlap amount c is a natural number multiple of the angle g of 1 tooth of the teeth part 29 ( c = n′g n ′; natural number).

Next, another embodiment will be described with reference to FIGS. The stator core 25 shown in FIG. 4 (a) _4, each core plate pieces 23a, a circumferential angle a of 23b as 60 °, the overlapping portions of the first and second core plates 26, 27 (amount) c (seam D of ₁ -D ₂ in length) and 12 °, it is obtained by a 5 number k of dowel 31 of each core plate pieces. Therefore, in the above equation [c = N · a / k], N = 1, a = 60, k = 5, and c = 60/5 = 12, which satisfies the above equation.

As shown in FIG. 1A, the core plate pieces 23a and 23b may be processed by a press progressive die with a relatively wide hoop material 1 so as to be arranged in parallel in the circumferential direction. as shown in b), a hoop material 1 ₁ of a relatively narrow, may be processed side by side in a serial manner such that each core plate pieces 23a, 23b are in the circumferential direction becomes in the feeding direction. In this case, six core plate pieces 23a (or 23b) forming one core plate 26 (or 27) are continuously formed as one group, and the first and second core plates 26 and 27 are respectively formed. The six core plate pieces 23a and 23b to be formed are processed alternately. At this time, in the first and second core plate pieces 23a and 23b, the dowels 31 are in the same phase and are processed by a common mold.

The stator core 25 ₅ shown in FIG. 5 (a), the circumferential angle a of each core plate pieces ₂₃ 1, 23 ₂ and 60 °, the overlapping portions of the first and second core plates 26, 27 (amount) c The number k of the dowels 31 of each core plate piece is set to four. Therefore, in the above equation [c = N · a / k], N = 1, a = 60, k = 4, and c = 60/4 = 15, which satisfies the above equation.

  In the processing of the core plate pieces by the press progressive die, the core plate pieces may be arranged in parallel or in series as shown in FIG. Regardless of which hoop material is used, in the first and second core plate pieces 23a and 23b, the dowels 31 are processed in the same phase and in the same mold.

The stator core 25 ₆ shown in FIG. 6 (a), each core plate pieces 23a, a circumferential angle a of 23b as 60 °, the overlapping portions of the first and second core plates 26, 27 (amount) c 18 ° And the number k of the dowels 31 of each core plate piece is four. Accordingly, in the above equation [c = N · a / k], 18 = N · 60/4 and N = 18/15, and N cannot take a natural number and does not satisfy the above equation.

6B, the dowels 31a and 31b at both ends of the first and second core plate pieces 23a and 23b have different phases, and the same die cannot be used. This is also a series arrangement according hoop material 1 ₁ narrow described above is the same even parallel arrangement by wide hoops 1 [see FIG. 1 (a)].

Even if the overlapping portion (amount) c is 18 °, k = N · a / c = N · 60/18 = N · 10/3, and when N is 3, the above equation holds, and The number k = 10 [pieces]. In this case, the distance between adjacent dowels e is 6 °, and the dowels at both ends of the core plate piece have a phase of 3 ° from both end faces. Since N (= 3) is an odd number (Nodd), three dowels are arranged in the overlapping portion c, and the center dowel is located on the center line F of the fixed portion 22a (22b).

  Each core plate piece of the core plate is not limited to the above-described embodiment, and may be any combination as long as the combination satisfies the formula [c = N · a / c].

22a, the overlap angle c of 22b fixed portion 23a first core plate pieces 23b second core plate pieces 25 _1, 25 ₂ ... stator core 26 first core plate 27 a second core plate 31 dowels a core plate pieces Part (angle)
k Number of dowels N Natural number (not including 0)
Odd odd

Claims (3)

A core plate piece having a fixed portion protruding on the outer periphery and divided into equal parts in the circumference is connected in an annular shape in the circumferential direction to form a core plate, and a plurality of core plate pieces are equally spaced from the core plate piece. In a stator core of a rotating electrical machine formed by forming a dowel, and fixing the core plate by aligning the fixing portion in the axial direction and engaging the dowel to stack a plurality of sheets,
The core plate piece includes a first core plate piece in which the fixing portion is formed at an end portion on one side in the circumferential direction, a second core plate piece in which the fixing portion is formed at an end portion on the other side in the circumferential direction, Consists of
A plurality of the first core plate pieces are connected in the circumferential direction to form an annular first core plate, and a plurality of the second core plate pieces are connected in the circumferential direction to form an annular second Forming the core plate of
The first core plate and the second core plate are laminated with the seams of the core plate pieces of the core plates shifted in the circumferential direction, and the seams of the first core plate in the circumferential direction of the core plates. To each other so that the fixed portion is positioned on the center line of the overlapping portion, which is an interval from the joint of the second core plate to the seam of the second core plate,
When the angle of the core plate piece is a, the angle of the overlapping portion is c, and the number of dowels of each core plate piece is k,
c = N · a / k where N = natural number (not including 0) , N <k
Satisfy the relationship
A stator core for a rotating electrical machine. N is an odd number,
The stator core of the rotary electric machine according to claim 1. N is 1.
The stator core of the rotary electric machine according to claim 2.

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