JP5486350B2 - Stator laminated iron core and manufacturing method thereof - Google Patents

Description

The present invention relates to a stator laminated core manufactured by laminating a plurality of stator core pieces that are cut from a work plate (magnetic metal plate) with a high yield, and a method for manufacturing the same.

Conventionally, a method of manufacturing a stator core piece by punching a region around a punched portion of the rotor core piece from a thin metal plate (workpiece plate) in which the rotor core piece is punched. There is. This manufacturing method is advantageous in that the rotor core piece and the stator core piece can be removed from a single metal sheet with a high yield, but when the air gap between the rotor core piece and the stator core piece is small, The punched debris between the two core pieces becomes narrow and breaks in the middle of punching, or it is punched twice without falling below the die of the punching die, or the die is pulled due to scrap catching. The problem of being damaged occurs.

Therefore, the applicant has proposed the manufacturing method of Patent Document 1 as a technique for solving this problem. In Patent Document 1, a thin-walled region (groove) is formed by pressing at least one surface of a rotor core piece and a stator core piece in the plate thickness direction and extending flatly, and after punching out an air gap. The width of the punching residue is expanded.
In addition, it is known that the metal thin plate is stretched by the volume of the thin portion where the surface of the metal thin plate is crushed by pressing in the plate thickness direction (groove width × groove depth), and when forming a thin region, Based on this stretching amount, the pressing width and pressing depth of the mold (blade) are set in accordance with the drawing amount.

Japanese Patent No. 2955804

However, in the manufacturing method of Patent Document 1, as in the iron core piece 102 shown in FIG. 8, the thin region 101 is formed avoiding the caulking portion 100, and the formation width (groove width) is limited. In order to ensure the amount of stretching, it is necessary to increase the pressing depth (groove depth), which causes a problem that torque characteristics are deteriorated. It has been confirmed by experiments that the torque characteristics are reduced when the pressing depth is increased.
This invention is made | formed in view of this situation, and it aims at providing the stator laminated iron core which suppressed the fall of the torque characteristic, and its manufacturing method.

The stator laminated core according to the present invention that meets the above-mentioned object is a stator core piece formed by punching a peripheral part of a punched hole from a magnetic metal plate provided with a punched hole made of a punched mark of a rotor core piece. A stator laminated iron core that is caulked and laminated via a caulking portion, wherein the magnetic pole piece portion of the stator core piece is provided with a thin area formed by pressing in the thickness direction, and the caulking portion Formed in the region.

In the stator laminated core according to the present invention, the caulking portion has a recess formed on one surface side of the stator core piece, and a protrusion corresponding to the recess is provided on the other surface side. It is preferable that it is higher than the pressing depth of the pressing in the thickness direction in which the thin region is formed. The one surface side is either the front surface side or the back surface side, and the other surface side is the opposite side of the one surface side.

In the stator laminated core according to the present invention, it is preferable that the thin region is formed on the whole or a part of the magnetic pole piece.

In the stator laminated core according to the present invention, it is preferable that the thin region is formed in a straight piece provided in a radially outer region of the magnetic pole piece.

In the stator laminated core according to the present invention, the thin region preferably has a thickness of 80 to 97% of the thickness of the magnetic metal plate.

In the stator laminated core according to the present invention, in the thin region, a front side groove formed by pressing the magnetic metal plate in the thickness direction from the front side and a back side groove formed by pressing in the thickness direction from the back side. Are preferably provided.

A method for manufacturing a stator laminated core according to the present invention that meets the above-described object is a method in which a peripheral portion of a punched hole is punched from a magnetic metal plate provided with a punched hole made of a punched mark of a rotor core piece. A stator laminated core manufacturing method for caulking and laminating a core core piece, wherein the magnetic pole piece of the stator core piece is pressed in the thickness direction to form a thinned area, and the caulked part is formed in the thinned area To do.

In the method for manufacturing a stator laminated core according to the present invention, the caulking portion is provided by forming a depression and a protrusion corresponding to the depression on one side and the other side of the stator core piece, respectively. The protrusion height of the protrusion is preferably higher than the pressing depth of the pressing in the thickness direction in which the thin region is formed.

In the method for manufacturing a stator laminated core according to the present invention, it is preferable that the thin region is formed on the whole or a part of the magnetic pole piece.

In the method for manufacturing a stator laminated core according to the present invention, it is preferable that the thin region is formed in a straight piece portion provided in a radially outer region of the magnetic pole piece portion.

In the method for manufacturing a stator laminated core according to the present invention, it is preferable that the thin region has a thickness of 80 to 97% of the thickness of the magnetic metal plate.

In the method for manufacturing a stator laminated core according to the present invention, different ranges of the magnetic metal plate are pressed in the thickness direction from the front side and the back side, respectively, to form a front side groove having a recessed front side and a back side groove having a recessed back side. Thus, it is preferable to provide the thin region.

In the stator laminated core according to the present invention, and the method for manufacturing the stator laminated core, the magnetic pole piece portion of the stator core piece is provided with a thin region formed by pressing in the thickness direction, and the caulking portion is provided in the thin region. Since it is formed, there is no need to provide a thin area by avoiding the formation portion of the caulking portion, and the thin area can be formed in a relatively wide range. Therefore, the depth of pressing can be reduced, and a predetermined amount of stretching can be provided while ensuring a certain thickness or more in the thin area, and the reduction in torque characteristics due to the thin area can be suppressed. is there.

Further, in the stator laminated core and the method for manufacturing the stator laminated core according to the present invention, the protrusion height of the protrusion provided on the other surface side corresponding to the depression on one surface side of the stator core piece forms a thin region. When the pressing depth in the thickness direction is higher than the pressing depth, the stator core pieces arranged above and below can be stably fixed via the caulking portion.
And in the manufacturing method of the stator laminated core and the stator laminated core according to the present invention, when the thin region is formed on the whole or a part of the magnetic pole piece, the degree of freedom in designing the stator laminated core is increased. Can do.
Furthermore, in the method for manufacturing a stator laminated core and a stator laminated core according to the present invention, when the thin region has a thickness of 80 to 97% with respect to the magnetic metal plate, the reduction in torque characteristics due to the thin processing is suppressed. On the other hand, the laminated stator core pieces can be reliably fixed by the caulking portion.

(A) and (B) are perspective views of a stator laminated core and a rotor laminated core according to the first embodiment of the present invention, respectively. (A) is a top view of the stator core piece used for the stator laminated core, and (B) is an X1-X1 arrow sectional view thereof. It is process drawing which shows the manufacturing method of the same stator laminated core. (A) is a top view of the stator core piece used for the stator laminated core which concerns on the 2nd Embodiment of this invention, (B) is the X2-X2 arrow sectional drawing. It is a partial explanatory drawing of the manufacturing method of the stator lamination | stacking iron core. (A) is a top view of the stator core piece used for the stator laminated core which concerns on the 3rd Embodiment of this invention, (B) is the X3-X3 arrow sectional drawing. It is a partial explanatory drawing of the manufacturing method of the stator lamination | stacking iron core. It is a top view of the stator core piece used for the stator laminated core which concerns on a prior art example.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1 (A), the stator laminated core 10 according to the first embodiment of the present invention is used for a stator of a stepping motor, and is arranged on the radially inner side of an annular yoke portion 11. A plurality of magnetic pole portions 12 are provided. Each magnetic pole part 12 is connected to the yoke part 11 at one end, and has a straight part 13 that performs winding, and a pole tooth part 14 that is provided radially inward of the straight part 13, and the pole tooth part 14 has a radius A plurality of child teeth 15 are provided on the inner side in the direction.

As shown in FIG. 1B, the rotor laminated core 16 used as a pair with the stator laminated core 10 has a shaft hole 17 formed at the center and a large number of external teeth 18 on the outer periphery. Yes. The rotor laminated iron core 16 is formed so that the external teeth 18 have a slight gap with the child teeth 15 of the stator laminated iron core 10 in a state where the rotor laminated iron core 16 is disposed in the accommodation hole 19 provided in the center of the stator laminated iron core 10. It can be rotated in the accommodation hole 19.

The stator laminated core 10 is formed by caulking and laminating a plurality of stator core pieces 20 (see FIGS. 2A and 2B) up and down via caulking portions 21.
As shown in FIGS. 2A and 2B, the stator core piece 20 includes an annular yoke piece portion 23 on the outer peripheral portion, and is disposed on the radially inner side of the yoke piece portion 23. A plurality of magnetic pole piece portions 24 connected to each other are provided. Each magnetic pole piece portion 24 is provided with a straight piece portion 25 that is laminated to form the straight portion 13 of the stator laminated core 10, and a pole tooth piece portion 26 that is connected to a radially inner portion of the straight piece portion 25. ing. The straight piece portion 25 is formed with a constant circumferential width, and the pole tooth piece portion 26 has a plurality of child tooth pieces 27 on the radially inner side and is laminated to form the stator laminated iron core 10. The pole tooth portion 14 is configured.

As shown in FIGS. 2A and 2B, the straight piece portion 25 in the magnetic pole piece portion 24 is provided with a thin region 28 that is formed by pressing in the thickness direction and flattening radially inward. A groove 29 having a rectangular cross section formed by pressing in the thickness direction is provided on the front side of the thin region 28. The thin region 28 has a thickness a1 of 80 to 97% of the thickness d of the yoke piece 23, and the groove 29 has a depth b1 (b1 = d−a1) of 3 to 20% of the thickness d. It has become. In the present embodiment, the thickness d is 0.1 to 1 mm, which is the same as the thickness of the magnetic metal plate 30 (see FIG. 3) of the work plate on which the stator core pieces 20 are formed by punching.
Further, the thin-walled region 28 is slightly spaced from the boundary with the yoke piece portion 23 in the straight piece portion 25, specifically, a gap having a length corresponding to 1 to 10% with respect to the radial length of the straight piece portion 25. Therefore, even if a certain amount of error occurs in the pressing operation when forming the thin region 28, a part of the yoke piece portion 23 is not accidentally thinned.

A depression of the caulking portion 21 that is a well-known half-cavity caulking is formed in the center of the front side (one surface side) of the thin area 28, and the depression corresponds to the depression in the center of the rear face side (other side) of the thin area 28. A protrusion of the caulking portion 21 is formed. The protrusion height of the protrusion on the back surface side of the caulking portion 21 is higher than the depth (pressing depth) b1 of the groove 29, for example, three times or more as high as b1. The piece 20 can be securely fixed.
The thin-walled region 28 has an arc shape with the center O of the stator core piece 20 as the center.

Next, the manufacturing method of the stator laminated core which manufactures the stator laminated iron core 10 is demonstrated.
As shown in FIG. 3, the method for manufacturing the stator laminated core is a method for manufacturing a rotor laminated core 16 together with the stator laminated core 10, which includes steps A to I.
In step A, a plurality of pilot holes 32 are formed in the long magnetic metal plate 30, and in step B, through holes 33 are formed in the magnetic metal plate 30 positioned by the pilot holes 32. The through hole 33 corresponds to the shaft hole 17 of the rotor laminated core 16 by laminating a plurality of rotor core pieces 31 described later.

In step C, a plurality of caulking portions 34 are formed around the through holes 33 formed in step B. In step D, the outer shape of the rotor core piece 31 is removed with the through hole 33 as the center, and a plurality of the rotor core pieces 31 are caulked and laminated via the caulking portion 34 to form the rotor laminated core 16. .
In step E, a plurality of slot holes are formed in the magnetic metal plate 30 by punching the peripheral area of the punch hole 35 formed by the punch marks of the rotor core piece 31 at equal intervals to form the contour of the magnetic pole piece portion 24. 36 is formed.
In the process F, the region forming the thin region 28 between the adjacent slot holes 36 is pressed (coined) from the surface side of the magnetic metal plate 30, and the groove 29 is formed on the surface side of the magnetic metal plate 30. The thin region 28 is formed. By the pressing in this step F, the formation portion of the thin region 28 is extended toward the center O ′ of the punching hole 35.

In step G, the center of the thin region 28 is pressed from the surface side of the magnetic metal plate 30 to form the caulking portion 21, and in step H, the peripheral portion of the punching hole 35 is punched, 25 and the pole piece portion 24 having the pole tooth piece portion 26 are formed. Then, the outer shape is removed in step I to form the stator core piece 20, and a plurality of the stator core pieces 20 are caulked and laminated via the caulking portion 21 to manufacture the stator laminated core 10.

Here, since the formation location of the thin region 28 is extended toward the center O ′ of the punching hole 35 in the process F, the periphery of the punching hole 35 is formed in the step H as compared with the case where the thin region is not formed. A wide punching area can be ensured. Accordingly, the punched debris generated by the punching in the process H falls to a predetermined place without breaking in the middle, and the punched debris can be reliably recovered. 31 and the stator core piece 20 can be taken together.
In addition, it has been experimentally confirmed that it is necessary to increase the thickness of the thin region in order to suppress a decrease in torque characteristics. On the other hand, in the present embodiment, the caulking portion 21 is formed in the thin region 28, and it is not necessary to provide the thin region avoiding the formation portion of the caulking portion, and the thin region is formed in a wider range than before. It becomes possible. Therefore, in process F, in order to secure a sufficient punching area in process H, even if the thin area 28 is stretched, a certain thickness (80% of the thickness of the magnetic metal plate 30) or more is secured in the thin area 28. And a decrease in torque characteristics can be suppressed. Furthermore, from the viewpoint of design design, the thin-walled region does not have to be formed avoiding the caulking portion, so that the degree of freedom in designing the stator core piece is increased.

Next, the stator core piece 40 used for manufacturing the stator laminated core according to the second embodiment of the present invention will be described. Note that the same components as those of the stator core piece 20 are denoted by the same reference numerals and detailed description thereof is omitted (the same applies to the following embodiments).
As shown in FIGS. 4A and 4B, the stator core piece 40 has a plurality of magnetic pole piece portions 41 connected to the yoke piece portion 23. Each magnetic pole piece portion 41 is provided with a straight piece portion 42 on the radially outer side and a pole tooth piece portion 43 disposed on the radially inner side of the straight piece portion 42. The pole tooth piece portion 43 has a plurality of child tooth pieces 44 on the radially inner side.

A thin region 45 is provided in the region of the magnetic pole piece 41 excluding a portion of 1 to 10% of the length of the straight piece 42 in the radial direction from the yoke piece 23 in the radial direction. The thin region 45 is formed by pressing in the thickness direction and flattening inward in the radial direction, and a step 46 formed by pressing in the thickness direction is provided on the front side of the thin region 45. The thin region 45 has a thickness a2 of 80 to 97% with respect to the thickness d of the yoke piece 23. And the hollow of the crimping part 47 which consists of half punching caulking is formed in the surface side center of the straight piece part 42. As shown in FIG.
The protrusion height on the back surface side of the caulking portion 47 has a value that is larger (higher) than the value obtained by subtracting the thickness a2 of the thin region 45 from the thickness d of the yoke piece portion 23 (for example, three times or more of d−a2). ing. The thin region 45 can also be formed on the entire magnetic pole piece 41.

Next, a method for manufacturing a stator laminated core using the stator core piece 40 will be described.
The stator laminated core manufactured using the stator core piece 40 is the same as the method for manufacturing a stator laminated core shown in FIG. The process F ′ shown in FIG.
In step F ′, the region where the magnetic pole piece 41 between the adjacent slot holes 36 is formed is pressed from the surface side of the magnetic metal plate 30, and the radially outer portion of the portion where the stellate piece 42 is formed. A thin region 45 is formed on the surface side of the magnetic metal plate 30. Since this pressing is performed on the area where the magnetic pole piece portion 41 is formed, it is possible to prevent distortion in the inner peripheral portion of the stator core piece 40 as compared with the case where a thin area is formed only on the straight piece portion. can do.

Next, the stator core piece 50 used for manufacturing the stator laminated core according to the third embodiment of the present invention will be described.
As shown in FIGS. 6A and 6B, the stator core piece 50 has a plurality of magnetic pole piece portions 51 connected to the yoke piece portion 23. Each magnetic pole piece portion 51 is provided with a straight piece portion 52 on the radially outer side and a pole tooth piece portion 26 disposed on the radially inner side of the straight piece portion 52.

The straight piece 52 is formed by pressing the magnetic metal plate 30 in the thickness direction from the surface side in the thickness direction and the cross section formed by pressing the magnetic metal plate 30 in the thickness direction from the back surface side. A rectangular backside groove 54 is provided. The front groove 53 is formed in the radially inner region of the straight piece 52, and the back groove 54 is formed in the radially outer region from the formation region of the front groove 53. And the thin area | region 55 is formed of the straight piece part 52 in which this front side groove | channel 53 and the back side groove | channel 54 were formed. Here, a portion that is not pressed is provided between the formation regions of the front-side groove 53 and the back-side groove 54, and the stator core piece 50 has a magnetic characteristic compared to the case where the non-pressed portion is not provided. Has been enhanced.

The formation regions of the front side groove 53 and the back side groove 54 of the thin region 55 have thicknesses a3 and a3 ′, respectively, and the thicknesses a3 and a3 ′ are 80 to 97% of the thickness d of the yoke piece 23. It is. And the front side groove | channel 53 and the back side groove | channel 54 are each provided with the depth of b3 (b3 = d-a3) and b3 '(b3' = d-a3 '), and the depth b3 and b3' are 3 of thickness d, respectively. ~ 20%.
Further, in the center of the surface side of the formation region of the front side groove 53, a recess of a caulking portion 56 formed by half punching is formed. The protrusion on the back surface side of the caulking portion 56 is higher than the depth b3 of the front side groove 53 and the depth b3 ′ of the back side groove 54, and has a height that is, for example, three times as high as b3 and b3 ′. .

Next, a method for manufacturing a stator laminated core using the stator core piece 50 will be described.
The stator laminated core manufactured using the stator core piece 50 is the same as the method for manufacturing the stator laminated core shown in FIG. Steps F1 ′ and F2 ′ shown in FIG.
In step F1 ′, the front side groove 53 is formed by pressing from the surface side the formation region of the front side groove 53 between the adjacent slot holes 36. In step F <b> 2 ′, the back side groove 54 is formed by pressing from the back side the formation region of the back side groove 54 located radially outside the formation region of the front side groove 53.

Since this pressing is performed from both the front side and the back side of the magnetic metal plate 30, warping caused by the pressing on the magnetic pole piece 51 compared to the case of pressing from only one of the front side and the back side. (Distortion) can be prevented.
In this embodiment, the front surface groove 53 is formed in the step F1 ′ and the back surface groove 54 is formed in the step F2 ′. However, the back side groove 54 is formed in the step F1 ′, and the front side groove 53 is formed in the step F2 ′. It may be formed. Further, although the caulking portion 56 is formed so that the recess is located on the front surface side of the front groove 53, the caulking portion can be provided so that the recess is located on the back surface side of the front groove 53. Further, the caulking portion may be formed in the back side groove 54, and in this case, the caulking portion can be formed so that the depression of the caulking portion is located on either the front surface side or the back surface side.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the caulking portion may be formed at a different location in each magnetic pole piece portion, and the caulking portion may be formed into a V-shaped caulking instead of half-caulking.
Furthermore, in any of the first to third embodiments, the slot hole 36 is not completely punched in the step E (see FIG. 3), and the slot hole is temporarily punched, and the subsequent step (step F or The slot holes may be removed after the thin regions 28, 45, 55 are formed in the step F ′ or the steps F1 ′, F2 ′). In this case, the shape accuracy of the slot holes is further improved. Can be accurate.

10: Stator laminated iron core, 11: Yoke part, 12: Magnetic pole part, 13: Straight part, 14: Polar tooth part, 15: Child tooth, 16: Rotor laminated iron core, 17: Shaft hole, 18: External tooth 19: receiving hole, 20: stator core piece, 21: caulking part, 23: yoke piece part, 24: magnetic pole piece part, 25: straight piece part, 26: pole tooth piece part, 27: child tooth piece, 28: Thin area, 29: groove, 30: magnetic metal plate, 31: rotor core piece, 32: pilot hole, 33: through hole, 34: caulking part, 35: punching hole, 36: slot hole, 40: stator core Piece: 41: Magnetic pole piece portion, 42: Straight piece portion, 43: Polar tooth piece portion, 44: Child tooth piece, 45: Thin-walled region, 46: Step, 47: Caulking portion, 50: Stator core piece, 51: Magnetic pole piece, 52: Straight piece, 53: Front groove, 54: Back groove, 55: Thin area, 56 Caulking portion

Claims (12)

Stator laminated core obtained by caulking and laminating a stator core piece formed by punching a peripheral portion of the punched hole from a magnetic metal plate provided with a punched hole made of a stamped trace of the rotor core piece via a caulked portion Because
A stator laminated core, wherein the magnetic pole piece portion of the stator core piece is provided with a thin region formed by pressing in a thickness direction, and the caulking portion is formed in the thin region. The stator laminated core according to claim 1, wherein the caulking portion has a recess formed on one surface side of the stator core piece, and a protrusion corresponding to the recess is provided on the other surface side, and a protrusion height of the protrusion is A stator laminated iron core characterized by being higher than the pressing depth of pressing in the thickness direction in which the thin region is formed. 3. The stator laminated core according to claim 1, wherein the thinned region is formed on the whole or a part of the magnetic pole piece. 4. 4. The stator laminated core according to claim 1, wherein the thin region is formed in a straight piece provided in a radially outer region of the magnetic pole piece. 5. Stator laminated iron core. 5. The stator laminated core according to claim 1, wherein the thin region has a thickness of 80 to 97% of a thickness of the magnetic metal plate. In the stator laminated core according to any one of claims 1 to 5, in the thin region, a front groove formed by pressing the magnetic metal plate in a thickness direction from the front surface side, and a thickness from the back surface side. A stator laminated iron core comprising a back groove formed by pressing in a direction. This is a method for manufacturing a stator laminated core in which a stator core piece formed by punching a peripheral portion of a punched hole from a magnetic metal plate provided with a punched hole made of a punched mark of a rotor core piece is caulked and laminated. And
A method of manufacturing a stator laminated core, wherein a thin area is formed by pressing in a thickness direction on a magnetic pole piece portion of the stator core piece, and a caulked portion is formed in the thin area. 8. The method of manufacturing a stator laminated core according to claim 7, wherein the caulking portion is provided by forming a depression and a protrusion corresponding to the depression on one side and the other side of the stator core piece, respectively. The protrusion height of the protrusion of the portion is higher than the pressing depth of the pressing in the thickness direction in which the thin region is formed. The method for manufacturing a stator laminated core according to claim 7 or 8, wherein the thinned region is formed in the whole or a part of the magnetic pole piece. The method for manufacturing a stator laminated core according to any one of claims 7 to 9, wherein the thin region is formed in a straight piece provided in a radially outer region of the magnetic pole piece. To manufacture a laminated stator core. The method for manufacturing a stator laminated core according to any one of claims 7 to 10, wherein the thinned region has a thickness of 80 to 97% of a thickness of the magnetic metal plate. Manufacturing method of iron core. The manufacturing method of the stator laminated core according to any one of claims 7 to 11, wherein different ranges of the magnetic metal plate are pressed in the thickness direction from the front side and the back side, respectively, and the front side groove in which the front side is recessed. And forming a thin-walled region by forming a back-side groove having a recessed back side.

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