JP5593830B2 - STACKING CORE FOR LAMINATION, ROTARY ELECTRIC AND METHOD FOR PRODUCING STACKING CORE FOR LAMINATION - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly to a technique for reducing saturation of magnetic flux generated in a stator of the rotating electrical machine.

The stator core is formed by punching and laminating electromagnetic steel sheets. The stator core consists of a tooth and a core back, and the space between the teeth is called a slot. When the outer peripheral part of the stator core is cylindrical, the distance between the slot bottom part and the outer peripheral part opened in the circumferential direction from the inner peripheral surface of the stator core is equal in the circumferential direction. However, when the laminated stator core is punched from the electromagnetic steel sheet, if the outer periphery of the stator core is circular, the electromagnetic steel sheet cannot be used at the four corners, and the yield of the material is reduced. In order to improve the yield of the material, it is considered to provide a linear portion on the outer periphery of the stator core.

However, in the linear portion, the distance from the bottom of the slot to the outer periphery is shorter than in the case of the circumferential shape, and the magnetic flux passing through this portion is likely to cause magnetic saturation. When magnetic saturation occurs in the core back portion of the stator core, the exciting current of the coil increases, so the copper loss increases and the efficiency of the rotating electrical machine decreases. In addition, since third harmonics are generated, circulating current loss occurs in the Δ (delta) connection, and efficiency is impaired. This harmonic causes electromagnetic vibration and noise.

When a metal frame is provided on the outer periphery of the stator core, leakage magnetic flux flows through the metal frame. Since leakage current increases eddy current loss, efficiency decreases. Further, if the stator is a quadrupole machine and the outer periphery of the stator core is a quadrangular stator, the three-phase magnetic resistance becomes unbalanced and a three-phase imbalance occurs. The negative-phase magnetic field generated by the three-phase imbalance causes a decrease in efficiency and electromagnetic vibration / noise.

In view of the above, in Patent Document 1, magnetic saturation is mitigated by taking the distance of the core back by making the depth of the slot in the straight line portion shallower than others. However, in this method, the cross-sectional areas of the slots differ in the circumferential direction, and the number of turns that can be wound in a small slot is reduced if the windings have the same wire diameter. In addition, due to the positional relationship between the pitch of the winding and the size of the slot, there arises a problem that winding cannot be performed well particularly with a three-phase motor.

On the other hand, Patent Document 2 discloses a technique for alleviating magnetic saturation by optimizing the position of the slot with respect to the straight line portion. Moreover, in patent document 3, magnetic saturation is relieve | moderated by shifting the punching position of an iron core at the time of punching. Changing the slot position may not be set well depending on the number of slots. In the method of shifting the punching position, it is necessary to sacrifice the material yield.

Japanese Patent Laid-Open No. 11-252841 JP 2009-247079 A JP 2009-195031 A

  As described above, in order to improve the material yield, when a linear portion is provided on the outer periphery of the stator core, the distance between the linear portion and the bottom of the slot is narrowed, and the magnetic flux is saturated in the linear portion of the stator core. Is prone to occur. Magnetic saturation reduces the efficiency of a rotating electrical machine and causes electromagnetic vibration and noise. Accordingly, an object of the present invention is to alleviate magnetic saturation that occurs in the stator core.

The laminated stator core according to the present application includes a core back provided with an arc-shaped circumferential portion on the outer periphery and a chord-like straight portion connected to the circumferential portion, and an inner periphery of the core back and directed toward the axis center. Is a laminated stator core with a plurality of continuous teeth extending, with a recess facing inward from the straight portion closest to the straight portion of the core back, closest to the straight portion of the core back. The back part of the slot is provided with a convex part extending outward from the straight part, and the same straight part is provided with the same number of concave parts and convex parts, and the first straight part and the second straight line are provided on the outer periphery of the core back. The protrusions provided on the first straight part and the recesses provided on the second straight part are in a fitting relationship and are perpendicular to the straight part. Of the straight lines, with respect to a vertical line passing through the axis center of the laminated stator core, Parts or protrusions in which are arranged asymmetrically.

The laminated stator core of the rotating electrical machine according to the present application is produced without punching in a large step, with the slot depth and pitch fixed in the circumferential direction. In the stator core manufactured from this laminated stator core, local magnetic saturation in the straight portion of the outer periphery of the core back is alleviated. It is possible to suppress an increase in copper loss due to an increase in excitation current, an increase in circulating current loss due to third harmonics during Δ connection, and an increase in eddy current loss due to leakage flux to the metal frame. A high rotating electrical machine can be provided.

It is the front sectional view (a) and the side sectional view (b) which show the outline of the rotary electric machine concerning the present invention. It is sectional drawing showing the relationship between a stator core and a flame | frame. It is a figure for demonstrating the result of having analyzed the magnetic flux density of the stator core. It is a figure for demonstrating the influence of the leakage magnetic flux which generate | occur | produced in the stator core. It is a figure explaining the case where the position where remarkable magnetic saturation has arisen in two slot bottoms corresponding to Embodiment 1. FIG. It is a figure for demonstrating the case where the remarkable position of magnetic saturation occurs in one place in a slot bottom part. It is a figure explaining the arrangement | positioning relationship of the stator core for lamination | stacking which has four linear parts, and a hoop material. It is a figure for demonstrating the relationship between the mountain-shaped recessed part provided in the linear part of the stator core, and the mountain-shaped convex part. It is a figure explaining the case where the shape of a recessed part and a convex part is circular arc shape corresponding to Embodiment 2. FIG. It is a figure explaining the case where one set of the circular arc-shaped recessed part and the circular arc-shaped convex part is provided in the linear part corresponding to Embodiment 3. FIG. It is a figure for demonstrating the uneven | corrugated | grooved part provided with the line segment between the recessed part and the convex part corresponding to Embodiment 4. FIG. It is a figure explaining the arrangement | positioning relationship between the hoop material and the lamination | stacking stator core provided with the two linear parts corresponding to Embodiment 5. FIG. It is a figure for demonstrating the gentle convex part provided in the linear part corresponding to Embodiment 5. FIG.

Embodiment 1 FIG.
The present application is widely applicable to rotating electrical machines such as general-purpose three-phase induction machines. A front view showing a schematic cross-sectional configuration of the rotating electrical machine is shown in FIG. 1A, and a side view is shown in FIG. An inner rotor type rotating electrical machine 1 includes a hollow stator 2, a rotor 3 disposed inside the stator 2, and a cylindrical frame 4 that accommodates the stator 2 and the rotor 3. Yes. The stator 2 includes a hollow stator core 5 made of a magnetic material and a plurality of coils 6 formed from windings. Here, nine coils 6 are shown. The rotor 3 includes a metal rotor shaft 7 and a rotor connecting member 8 to which a permanent magnet is coupled. The rotor 3 starts rotating as a current is passed through the coil 6 to excite the stator 2.

  FIG. 2 is a cross-sectional view showing the relationship between the frame 4 and the stator core 5. The stator core 5 is formed by laminating a plurality of thin laminated stator cores 11 and integrating them. The stator core 5 and the laminated stator core 11 are configured by a substantially annular core back 18 and a tooth 12 having a T-shape provided inside the core back 18. The outer periphery of the core back 18 includes an arcuate circumferential portion 13 and a string-like linear portion 14. Here, four straight portions 14 are provided. There are four gaps 15 between the frame 4 and the stator core 5.

In the example of FIG. 2, 36 teeth 12 are provided on the stator core 5 at a constant interval on the circumference. The slot 16 points to a gap between the teeth 12. A portion connecting adjacent teeth 12 is referred to as a slot bottom portion 17. The four straight portions 14 are provided with uneven portions 22 respectively. The concave and convex portions 22 provided on the upper and lower sides are in a line-symmetric relationship with respect to the horizontal center line. Similarly, the concavo-convex portions 22 provided on the left and right are in a line-symmetric relationship with respect to the vertical center line.

FIG. 3 shows the result of analyzing the magnetic field distribution of the stator core 5. The magnetic field intensity is expressed as a concentration difference for the right half of the stator core 5. A foot 12 a of the tooth 12 extends from the inner peripheral side of the core back 18 toward the shaft center 31. A coil 6 is attached to the foot 12a. Comparing the circumferential portion 13 and the straight portion 14, the straight portion 14 has a short distance from the slot bottom 17 to the outer periphery, and therefore the iron core tends to be insufficient. On the other hand, in the circumferential portion 13, the distance from the slot bottom portion 17 to the outer periphery is uniform and longer than the straight portion 14. For this reason, the linear part 14 is more likely to saturate the magnetic flux than the circumferential part 13. The vertical line 32 represents a straight line passing through the axial center 31 of the stator core 5 among the straight lines perpendicular to the straight portion 14. In the straight portion 14 of the core back 18, two places where magnetic saturation is likely to occur remarkably appear above and below the vertical line 32.

  The influence when the magnetic flux is saturated will be described with reference to FIG. 4. When the stator core 5 is saturated, a leakage magnetic flux exists in addition to the main magnetic flux. FIG. 4 shows that the main magnetic flux passes through the core back 18 of the stator core 5, but the leakage magnetic flux passes through the frame 4. The leakage magnetic flux induces an eddy current in the frame 4. The eddy current flowing in the frame 4 flows in a direction perpendicular to the leakage magnetic flux (perpendicular to the paper surface). Since the amount of the iron core is small in the slot back portion 17s, the magnetic flux is likely to be saturated as compared with the teeth back portion 12s.

When the leakage magnetic flux increases, the exciting current of the coil increases, so the copper loss increases and the efficiency of the rotating electrical machine decreases. In addition, since the third harmonic is generated, a circulating current loss occurs in the Δ connection. This harmonic can cause electromagnetic vibration and noise. When the metal frame 4 is provided on the outer peripheral portion of the stator core 5, leakage magnetic flux flows through the metal frame. Since eddy current losses occur, efficiency is compromised. For example, if the stator core is a quadrilateral in a quadrupole machine stator, the three-phase magnetic resistance becomes unbalanced and a three-phase imbalance occurs. The reversed-phase magnetic field generated by the three-phase imbalance induces a decrease in efficiency and an increase in electromagnetic vibration / noise.

For this reason, it is preferable that the material of the frame 4 of the rotating electrical machine 1 is iron (steel plate or cast iron). If the frame 4 is a steel plate frame, when magnetic saturation becomes significant at the linear portion 14 on the outer peripheral portion of the stator core 5, magnetic flux leaks to the steel plate, and eddy current loss occurs in the steel plate frame. By providing the concavo-convex portion 22 in the eddy current loss generated in the steel plate frame is reduced.

Among the straight portions 14, the place where the magnetic saturation is most remarkable varies depending on the positional relationship between the slot bottom portion 17 and the straight portion 14. FIG. 5 shows a tooth 12m and a slot bottom 17m. The vertical line 32 represents a straight line passing through the axial center of the stator core 5 among straight lines perpendicular to the straight line portion 14. Teeth 12m refers to the one having the shortest distance between the base of the foot 12a and the straight portion 14 among the teeth arranged in the straight portion 14. Similarly, the slot bottom portion 17m indicates the shortest distance from the straight portion 14 among a plurality (four places) of slot bottom portions arranged in the straight portion 14.

In the positional relationship shown in FIG. 5, as in the case of FIG. 3, the vertical line 32 passes through the foot 12a of the tooth 12m but does not pass through the slot bottom 17m. Since there is the foot 12a of the tooth 12m on the vertical line 32, the magnetic saturation occurs at the slot bottom 17m where the iron core is few. There are two slot bottom portions 17m at which magnetism is likely to be saturated. Two arrows in the figure indicate positions where magnetism is likely to be saturated. Magnetic saturation occurs at the slot back 17s. In the remaining two slot bottoms on both sides, the distance from the straight line part is longer than that of the slot bottom part 17m, so that the magnetic flux is hardly saturated. The two slot bottom portions 17m and the vertical line 32 are separated from each other by a half slot.

Also in FIG. 6, the vertical line 32 represents a straight line passing through the axial center of the stator core 5 among the straight lines perpendicular to the straight line portion 14. The slot bottom portion 17m represents the shortest distance from the straight portion 14 among the plurality of slot bottom portions. In the positional relationship shown in FIG. 6, the vertical line 32 passes through the slot bottom 17m. In this case, there is only one position where the magnetic saturation is remarkable. Compared to FIG. 5, in FIG. 6, the position of the slot 17 is shifted in the circumferential direction by a half slot. Of the three slot bottoms 17 shown in the figure, magnetic saturation is likely to occur at the central slot bottom 17m. In the adjacent slot bottoms 17, the distance from the straight line part 14 is longer than that of the slot bottoms 17 m, so that the magnetic flux is hardly saturated. Arrows in the figure indicate positions where magnetism is likely to be saturated. Magnetic saturation occurs at the slot back 17s.

  In the present application based on the above analysis, the magnetic saturation is relaxed by providing the concavo-convex portion 22 in the linear portion 14. FIG. 7 shows the positional relationship between the hoop material 20 and the laminated stator core 11. The stacking stator core 11 is manufactured by punching from the hoop material 20 using a die without dividing one round in the circumferential direction. The hoop material 20 refers to a steel material in which an elongated iron plate is wound in a coil shape, and here, a sheet of electromagnetic steel plate is used. In the figure, six laminated stator cores 11 are drawn on one hoop material 20. One laminated stator core 11 is provided with four straight portions 14.

Similar to the stator core 5, the laminated stator core 11 is formed of a substantially annular core back 18 and a tooth 12 having a T-shape provided inside the core back 18. The width of the hoop material 20 is narrower than twice the outer dimension of the circumferential portion 13. In the present application, in order to improve the material handling of the hoop material 20, the straight portions 14 of the lamination stator cores 11 are arranged in such a way that they meet the linear portions 14 of the adjacent lamination stator cores 11. A material yield almost the same as that of a straight line can be achieved by shifting a neighboring iron core a little when punching an iron core.

The right-row stacking stator cores 11 and the left-row stacking stator cores 11 are in contact with each other at the central linear portion 14. Further, the upper laminated stator core 11 is in contact with the middle laminated stator core 11 at the straight portion 14. Similarly, the middle stacking stator core 11 is in contact with the lower stacking stator core 11 at the straight portion 14. Two vertical dotted lines 33 are lines connecting the centers of the laminated stator cores 11. The stacking stator cores 11 in the right row are arranged substantially in a straight line, but the central stacking stator core 11 is shifted to the right by half a slot compared to the upper and lower stacking stator cores 11. Similarly, the laminated stator cores 11 in the left row are arranged substantially in a straight line, but the central laminated stator core 11 is shifted to the right by half a slot compared to the upper and lower laminated stator cores 11. .

The three horizontal dotted lines 34 pass through the center of the right stacking stator core 11 and the axial center of the left stacking stator core 11. The upper right stacking stator core 11 is shifted by half a slot above the upper left stacking stator core 11. Similarly, the middle right stacking stator core 11 is shifted by half a slot above the middle left stacking stator core 11. Further, the lower right stacking stator core 11 is shifted by a half slot above the lower left stacking stator core 11.

The positional relationship between the right laminated stator core 11 and the left laminated stator core 11 will be described in more detail with reference to FIG. In FIG. 8, the lamination stator core 11a arranged on the left side and the lamination stator core 11b arranged on the right side are arranged by fitting the linear portions 14 provided with the concave and convex portions. The state of being is drawn. A concave portion 23 and a convex portion 24 are provided in the straight portion 14 of the lamination stator core 11a and the straight portion 14 of the lamination stator core 11b, respectively. The vertical line 34a represents a straight line passing through the axial center of the laminated stator core 11a among the straight lines perpendicular to the straight portion 14. The vertical line 34b represents a straight line passing through the axial center of the laminated stator core 11b among the straight lines perpendicular to the straight portion 14. The laminated stator core 11b is shifted upward by half a slot as compared to the laminated stator core 11a. The slot back portion 17 s indicates a region sandwiched between the slot bottom portion 17 and the straight portion 14. Since the teeth back portion 12s has the foot portion 12a, the iron core is sufficient. Therefore, the convex portion 24 is provided on the slot back portion 17s and the concave portion 23 is provided on the teeth back portion 12s.

There are two slot bottom portions 17m in each of the vertical portion 14 of the lamination stator core 11a and the vertical portion 14 of the lamination stator core 11b (see FIG. 5). The right slot bottom portion 17m is raised by half a slot from the left slot bottom portion 17m. Utilizing this fact, in the straight portion 14 of the laminated stator core 11a, first, a concave portion 23 directed inward from above is provided, and then a convex portion 24 directed outward is provided. Further, the straight portion 14 is dented inward, and then bulges toward the lamination stator core 11b. Eventually, two sets of the mountain-shaped concave portion 23 and the mountain-shaped convex portion 24 are provided in each of the lamination stator core 11a and the lamination stator core 11b. The same number of the concave portions 23 and the convex portions 24 are provided in one linear portion 14.

The convex part 24 of the lamination | stacking stator core 11a fits into the recessed part 23 of the lamination | stacking stator core 11b. The concave portion 23 of the lamination stator core 11a is fitted into the convex portion 24 of the lamination stator core 11b. The depth of the concave portion 23 and the convex portion 24 is such that the distance between the concave portion 23 on the teeth back portion and the slot bottom portion is not shorter than the distance between the slot bottom portion and the convex portion 24. In this case, the deviation of the upper, lower, left and right cores when punching from the hoop material is approximately half a slot. In addition, by making the recesses 23 and the projections 24 substantially the same shape, as shown in FIG. 7 or FIG. 12, the laminated stator core can be removed from the hoop material without undue waste by slightly shifting it. The material can be used with good yield.

In addition, using a mold for punching a single laminated stator core, as shown in FIG. 7, punching while fitting the concavo-convex portion 22, the direction of the mold is rotated 90 degrees each time punching is performed. It is necessary and large. Therefore, in practice, it is convenient to use a mold that can integrally punch through the four laminated stator cores included in the first and second stages. Using this mold, punching is performed for two steps at a time in a state where the uneven portions of the first-stage lamination stator core and the uneven portions of the second-stage lamination stator core are fitted. Next, the mold is moved downward by two stages, and the third-stage laminated stator core and the fourth-stage laminated stator core are punched at a time.

The stator core of the rotating electrical machine having the concavo-convex portion 22 in the straight portion is formed without punching in a large step while fixing the depth and pitch of the slot in the circumferential direction. In the rotating electrical machine thus created, local magnetic saturation of the core back is alleviated in the straight line portion of the outer peripheral portion of the stator core. It is possible to suppress an increase in copper loss due to an increase in excitation current, an increase in circulating current loss due to third harmonics during Δ connection, and an increase in eddy current loss due to leakage flux to the metal frame. A high rotating electrical machine can be provided.

In addition, since the harmonic magnetic flux generated by magnetic saturation such as the above-mentioned third harmonic can be reduced, the electromagnetic excitation force that causes electromagnetic vibration and noise is reduced, and a quiet rotating electric machine is provided. be able to. Furthermore, depending on the number of poles, the three-phase impedance differs depending on the local magnetic saturation, and there is a possibility that a three-phase unbalanced current will flow, but this can prevent a decrease in efficiency and electromagnetic excitation force. it can.

Embodiment 2. FIG.
In Embodiment 2 to Embodiment 5, another form of the concave portion 23 and the convex portion 24 is shown. In FIG. 9 representing the second embodiment, the concave portion 23 and the convex portion 24 each have an arc shape. Two arcuate recesses 23 and two arcuate protrusions 24 are provided in one linear part 14. Since the shape of the concavo-convex portion is gentle compared to the mountain shape, the leakage of magnetic flux is reduced, and the effect of preventing injury when handling is also produced. The relationship between the straight line portion 14 and the slot bottom portion 17 is the same as in FIG. The arc-shaped concave portion 23 and the arc-shaped convex portion 24 are in a fitting shape relationship. The vertical line 32 passes through the teeth.

Embodiment 3 FIG.
FIG. 10 shows a case where the vertical line 32 passes through the slot bottom portion 17m. One concave portion 23 and one convex portion 24 are provided in one linear portion 14. In this case, when the punch is punched from the hoop material 20, the deviation between the upper, lower, left and right cores is approximately a half slot. The relationship between the straight line portion 14 and the slot bottom portion 17 is the same as in FIG. Again, the number of recesses 23 and the number of projections 24 are equal. The arc-shaped concave portion 23 and the arc-shaped convex portion 24 are in a fitting shape relationship.

Embodiment 4 FIG.
In FIG. 11, the vertical line 32 passes through the foot 12 a of the tooth 12. Compared with the second embodiment, two line segments 25 are provided between the concave portion 23 and the concave portion 23 and between the convex portion 24 and the convex portion 24. Two convex portions 24 are provided from the lower side of the figure with a line segment 25 in between, and are directly connected to the concave portion 23. The lower recess 23 is connected to the upper recess 23 with the line segment 25 in between. The convex line convex (convex part-line segment-convex part) part and the concave line concave part (concave part-line segment-concave part) have a shape relationship to be fitted. There are two places where magnetic saturation is most likely to occur as described with reference to FIG. The slot back portion corresponds to the upper and lower convex portions 24. In this case, the deviation of the upper, lower, left and right cores when punching from the hoop material 20 is one slot or more.

Embodiment 5 FIG.
When a plurality of laminated stator cores are punched from the hoop material 20, the laminated stator cores are punched with a slight deviation, so that a little margin is left at the end of the hoop material 20. FIG. 12 shows the relationship among the laminated stator core 11 c, the laminated stator core 11 d, and the hoop material 20. The four laminated stator cores 11 c indicate the laminated stator cores disposed on the upper end side and the lower end side of the hoop material 20. The three laminated stator cores 11d indicate the laminated stator cores sandwiched between the laminated stator cores 11c.

As in FIG. 7, the first-stage stacking stator core and the third-stage stacking stator core are in a straight line. The second-stage stacking stator core and the fourth-stage stacking stator core are in a straight line. The second-stage stacking stator core and the fourth-stage stacking stator core are shifted to the right by half a slot with respect to the first-stage stacking stator core, and the uneven portion 22 is fitted. It is arranged in the state of letting.

Two linear portions 14 are provided in the lamination stator core 11c and the lamination stator core 11d. The two straight portions of the laminated stator core 11d are provided with uneven portions 22 respectively, but the laminated stator core 11d is provided with one uneven portion 22. In the straight line portion on the open end side of the laminated stator core 11c, there is no meaning even if there is a concave portion, so a gentle convex portion 24 is provided. FIG. 13 shows the open end side of the laminated stator core 11c. The straight end portion 14c on the open end side is composed of only one convex portion 24 and gently bulges outward.

In order to use the mold for punching a single laminated stator core and punch it while fitting the concavo-convex portion 22 as shown in FIG. 12, it is necessary to rotate the direction of the mold 180 degrees each time it is punched. is there. Therefore, in practice, it is convenient to use a mold that can punch through the two laminated stator cores 11 included in the first and second stages at a time.

The present application can be generally used for a stator of a rotating electric machine. In particular, in a rotating electrical machine in which a stator core is integrally punched from a sheet of an electromagnetic steel sheet, this is effective when the magnetic flux density of the core back is increased.

DESCRIPTION OF SYMBOLS 1 Rotating electric machine, 2 Stator, 3 Rotor, 4 Frame, 5 Stator core, 6 Coils, 11 Stacking stator core, 12 Tees, 12s Teeth back part, 13 Circumferential part, 14 Linear part, 16 Slot, 17 Slot bottom, 17s Slot back, 18 Core back, 20 Hoop material, 22 Concave part, 23 Concave part, 24 Convex part, 25 Line segment

Claims (7)

A core back provided with an arc-shaped circumferential portion on the outer periphery and a string-like linear portion connected to the circumferential portion, and a plurality of continuous teeth provided on the inner periphery of the core back and extending toward the axis center Stator core for lamination,
The back part of the teeth closest to the straight part of the core back is provided with a concave part directed inward from the straight part, and the back part of the slot closest to the straight part of the core back is provided with a convex part directed outward from the linear part ,
In one straight part, the same number of concave parts and convex parts are provided,
The first straight portion and the second straight portion are provided in a line-symmetrical position on the outer periphery of the core back, and the convex portion provided in the first straight portion and the concave portion provided in the second straight portion. Is in the shape relationship to fit,
A laminated stator core characterized in that concave portions or convex portions are arranged asymmetrically with respect to a vertical line passing through the axial center of the laminated stator core among straight lines perpendicular to the straight portion . 2. The laminated stator core according to claim 1 , wherein the concave portion and the convex portion provided in the straight portion are mountain-shaped. 2. The laminated stator core according to claim 1 , wherein the concave portion and the convex portion provided in the straight portion are arc-shaped. A core back provided with an arc-shaped circumferential portion on the outer periphery and a string-like linear portion connected to the circumferential portion, and a plurality of continuous teeth provided on the inner periphery of the core back and extending toward the central axis Stator core for lamination,
A line segment is provided on the back portion of the tooth closest to the straight portion of the core back, and a convex portion extending outward from the straight portion is provided on the back portion of the two slots closest to the straight portion of the core back. Are provided on the same straight line portion, and a concave concave portion that fits into the convex convex portion is provided on the same straight line portion .
In one straight part, the same number of concave parts and convex parts are provided,
The first straight portion and the second straight portion are provided in a line-symmetrical position on the outer periphery of the core back, and the convex portion provided in the first straight portion and the concave portion provided in the second straight portion. Is in the shape relationship to fit,
A laminated stator core characterized in that concave portions or convex portions are arranged asymmetrically with respect to a vertical line passing through the axial center of the laminated stator core among straight lines perpendicular to the straight portion . In a rotating electrical machine having a hollow stator formed by laminating laminated stator cores, a rotor disposed inside the stator, and a cylindrical frame that accommodates the stator and the rotor, for lamination The stator core has a core back provided with an arc-shaped circumferential portion on the outer periphery and a string-like linear portion connected to the circumferential portion, and a continuous portion extending toward the axis center provided on the inner periphery of the core back. With multiple teeth,
The back part of the teeth closest to the straight part of the core back is provided with a concave part directed inward from the straight part, and the back part of the slot closest to the straight part of the core back is provided with a convex part directed outward from the linear part ,
In one straight part, the same number of concave parts and convex parts are provided,
The first straight portion and the second straight portion are provided in a line-symmetrical position on the outer periphery of the core back, and the convex portion provided in the first straight portion and the concave portion provided in the second straight portion. Is in the shape relationship to fit,
A rotating electrical machine , wherein a concave portion or a convex portion is arranged asymmetrically with respect to a vertical line passing through an axial center of the laminated stator core among straight lines perpendicular to the straight line portion . The rotating electrical machine according to claim 5 , wherein the material of the frame is iron. A method of punching a laminated stator core from a hoop material using a mold,
The laminated stator core has a core back provided with an arc-shaped circumferential portion on the outer periphery and a string-like straight portion connected to the circumferential portion, and toward the central axis of the core back provided on the inner periphery of the core back. It has a plurality of continuous teeth that extend and has a recess facing inward from the straight portion at the back of the tooth closest to the straight portion of the core back, and a straight portion at the back of the slot closest to the straight portion of the core back Protrusions toward the outside are provided ,
In one straight part, the same number of concave parts and convex parts are provided,
The first straight portion and the second straight portion are provided in a line-symmetrical position on the outer periphery of the core back, and the convex portion provided in the first straight portion and the concave portion provided in the second straight portion. Is in the shape relationship to fit,
Of the straight lines perpendicular to the straight line portion, the concave or convex portions are arranged asymmetrically with respect to the vertical line passing through the axial center of the laminated stator core ,
Punching out the stator core for lamination using a die that can be punched in two steps at a time, with the concavo-convex part of the first-stage laminated stator core and the uneven part of the second-stage laminated stator core fitted Process,
A method of manufacturing a laminated stator core, comprising a step of moving a die by two stages and simultaneously punching out a third-stage laminated stator core and a fourth-stage laminated stator core .

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