JP2009065833A - Laminated core and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep favorable magnetic properties and to improve shape accuracy of a stator by eliminating displacement of the connection face of adjacent back yoke sections. <P>SOLUTION: The inner face in the radial direction of a back yoke section 12 of a divided laminated core 10 has a plane orthogonal to a tooth section 13. The back yoke section 12 has sections 15a and 16a which overlap in the lamination direction with the back yoke sections of divided laminated cores adjacent in its circumferential direction, and also abuts, at the ends of the overlapping sections, upon the divided laminated cores adjacent in its circumferential direction. The shape of abutting ends is different from a straight line that passes through the center of the annular core, when projected in the direction of lamination, and has the shape of straight lines which are in at least two directions different by the position in the direction of lamination. The shape of the straight lines in the different directions, when projected in the lamination direction, cross each other at the inner face in the radial direction of the back yoke sections 12, when projected in the lamination direction, and the distance between them becomes larger according to the distance from the center of the core. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated iron core configured by annularly connecting divided laminated iron cores formed by laminating iron core sheets and a method for manufacturing the same.

  In a concentrated-winding stator core, there is a structure in which winding is performed on a divided core divided for each tooth, and then adjacent divided cores are connected to form a ring. By adopting this structure, winding work becomes easy and the density of the coil to wind can be made high. However, if there are gaps of more than a dozen microns on the split surface of adjacent split cores, or if the connecting surfaces of the teeth are displaced in the stacking direction, they are electrically connected, eddy currents flow and iron loss increases. There is a problem of doing.

  Moreover, if the positioning at the time of connecting an adjacent division | segmentation iron core is bad, the shape precision as a stator will deteriorate. When the shape accuracy of the stator deteriorates, in order to avoid contact with the rotor, it is necessary to widen the air gap between the stator and the rotor, resulting in a problem that the magnetic resistance increases. Therefore, in order to obtain the shape accuracy of the stator, it is necessary to prevent displacement of the split iron core on the connection surface.

  Conventionally, as a method of manufacturing a split laminated core, a taper portion or a curved surface portion that is a non-perpendicular portion is formed only at one end portion of a yoke portion of each core piece of the split laminated core so that each end portion and each concave portion are slightly different from each other. Even in a corresponding state, each non-right-angled portion is smoothly guided into the recessed portion, and an easy and reliable fitting between each end portion and each recessed portion has been disclosed (for example, patents) Reference 1).

Japanese Patent No. 3461552 (action, effect of the invention, FIG. 3)

  However, in Patent Document 1, a gap is generated in the portion where the taper portion or the curved surface portion of the yoke portion is formed when the adjacent divided laminated iron cores are joined. Therefore, the space factor (density density) of the iron core is increased by the gap. ) Decreases and the magnetic properties deteriorate. Further, since the connecting surfaces of adjacent yoke portions are parallel to the radial direction of the iron core, there is a problem that the position is easily displaced and the accuracy of the stator is deteriorated.

  The present invention has been made in order to solve the above-described conventional problems, and provides a laminated iron core that keeps the magnetic properties good while minimizing the gap between adjacent divided laminated iron cores.

  It is another object of the present invention to eliminate the positional deviation between the connecting surfaces of adjacent yoke portions and improve the shape accuracy of the stator.

A laminated iron core according to the present invention is a laminated iron core configured by arranging annular laminated cores formed by laminating iron core sheets in an annular shape,
The split laminated iron core includes a back yoke portion and a teeth portion extending radially inward from the back yoke portion,
The radially inner surface of the back yoke portion has a plane perpendicular to the teeth portion,
The back yoke portion has an overlapping portion in the stacking direction with the back yoke portion of the divided laminated iron core adjacent in the circumferential direction, and is in contact with the divided laminated iron core adjacent in the circumferential direction at the end of the overlapping portion, and the abutting end portion When projected in the stacking direction, the shape is different from a straight line passing through the center of the iron core at the time of annular arrangement, and has a linear shape in at least two different directions depending on the position in the stacking direction. When projected, they intersect at the radially inner surface of the back yoke portion, and the mutual distance increases according to the distance from the center of the iron core.

The method for manufacturing a laminated iron core according to the present invention includes:
A method of manufacturing a laminated iron core in which divided laminated iron cores are arranged in a ring to form a laminated iron core,
A matching hole, which is a relief hole for the next process, including a part of the outer periphery of the annular back yoke part, and an inner peripheral part of the back yoke part and a plurality of teeth parts extending radially inward from the back yoke part An initial forming step of punching on the sheet;
Between the location where the matching hole is formed and the space formed by punching surrounded by the adjacent teeth portion and the inner periphery of the back yoke, for each iron core sheet, in the unit of teeth in the circumferential direction of the back yoke The first divided surface forming step for forming the first divided surface having the first linear shape, and the second divided surface forming step for forming the second divided surface having the second linear shape different from the first divided surface. A split surface forming step for carrying out
A first iron core sheet punched out from the outer periphery of the back yoke portion separated by the dividing surface, and separated from each other by the first dividing surface in units of the back yoke portion and the tooth portion extending to the back yoke portion, And a split core sheet forming step of forming second core sheets that are separated from each other on the second split surface and arranged in an annular shape, and
A plurality of first core sheets and second core sheets are provided in the stacking direction at the end portions of the respective back yokes, and a plurality of stacked cores are stacked while maintaining the arrangement. A laminating process to form,
In the initial forming step, the radially inner surface of the back yoke portion is formed in a planar shape perpendicular to the teeth portion,
The first and second linear shapes of the dividing surface forming step do not pass through the center of the core when the divided laminated cores are annularly arranged when projected in the laminating direction, and the first linear shape and the second linear shape are The crossing occurs on the inner boundary in the radial direction of the back yoke, and the mutual distance increases according to the distance from the center of the iron core.

  According to the laminated iron core of the present invention, the magnetic characteristics can be kept good.

  Further, it is possible to eliminate the positional deviation of the connecting surfaces of the adjacent back yoke portions, and to improve the shape accuracy as the annular iron core.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a split laminated iron core according to Embodiment 1 of the present invention.

  In FIG. 1, a divided laminated core 10 is divided for each tooth (magnetic pole tooth) unit, and is a laminated body formed by laminating a plurality of iron core sheets. Each of the divided laminated cores 10 includes a back yoke portion 12 and a teeth portion 13 that extends from the back yoke portion 12 in the radial direction.

  Then, on the side where the adjacent divided laminated cores 10 come into contact with each other, overlapping portions 15a and 16a that overlap with the core sheets of the adjacent divided laminated cores are provided on the alternately laminated iron core sheets 15 and 16, respectively.

  Further, a thin plate portion 20 having a tip formed thinner than the thickness of the core sheet is provided at a position corresponding to a corner or R portion of the edges of the overlapping portions 15a and 16a of the core sheet. Specifically, a triangular chamfered chamfered portion 20 is formed.

  2A and 2B are enlarged views for explaining the process of forming the triangular chamfered chamfered portion 20, wherein FIG. 2A shows a state before pressing, and FIG. 2B shows a state after pressing.

  The chamfered portion 20 can be formed by a pressing process. In this case, the iron core sheet is extended by a thickness that is reduced. In the present embodiment, a groove portion 30 having a shape smaller than the outer shape of the iron core sheets 15 and 16 is provided in the vicinity of forming the chamfered portion 20. Even if the iron core sheet of the chamfered portion 20 is extended at the time of press forming due to the presence of the groove portion 30, it does not expand from the outer shape of the iron core sheets 15 and 16, and avoids contact with an adjacent iron core sheet. it can. Moreover, even if the chamfered portion 20 of the press molding is extended by providing the groove portion 30 also in the outer peripheral direction, it does not protrude from the outer periphery. The divided laminated iron core may be positioned by press fitting its outer periphery into the frame, but even in that case, since the outer periphery is not uneven, it can be pressed without interfering with each other.

  FIG. 3 is an enlarged perspective view showing the connection between the divided laminated cores according to the first embodiment, and FIGS. 4A and 4B are a plan view and a partial cross-sectional view showing the steps of connecting the divided laminated iron cores. It is.

  As shown in FIGS. 3 and 4, adjacent divided laminated cores 10 are inserted by bringing the overlapping portions 17 a and 18 a of the laminated iron core sheets of the back yoke portions 12 close to each other. At this time, the thin plate portions 20 formed at the corners of the overlapping portions 17a and 18a or the edge of the R portion are smoothly inserted between the adjacent iron core sheets.

  As described above, even if the core sheet is slightly displaced in the laminating direction, the position is shifted by inserting the adjacent divided laminated iron core 10 from the thin plate portion 20 side formed thinner than the plate thickness. Insertion is possible without Moreover, since the thin plate part 20 is only a part, it is possible to prevent the space factor of the iron core from deteriorating. Furthermore, by arranging the thin plate portion 20 on the outer peripheral side of the iron core, there is an effect that the magnetic characteristics as the iron core are not impaired.

  As shown in FIG. 3, a groove or hole 31 is provided at a position facing the thin plate portion 20 in the adjacent core sheet connected to the overlapping portions 17 a and 18 a of the divided laminated core 10.

  5 (a) and 5 (b) are plan views showing two types of core sheets 17 and 18 constituting the split laminated core according to the first embodiment, and FIG. 6 shows the two types of core sheets 17 and 18 described above. It is a top view which shows the state laminated | stacked. 5 and 6 show a state in which the iron core sheet is arranged in an annular shape.

  As shown in FIGS. 5A and 5B, the contact surfaces of the adjacent iron core sheets 17 and 18 are divided by straight lines 19a and 19b. The positions of the straight lines 19a and 19b to be divided are different in two types (a) and (b), and are not parallel to the line extending in the radial direction (normal direction) from the center of the iron core. When these iron core sheets 17 and 18 are alternately laminated, as shown by the solid and broken lines in FIG. 6, the positions of the divided straight lines 19a and 19b are shifted so that the overlapping portions 17a and 18a overlapping in the laminating direction are obtained. Occurs. Thus, since the shape of the connection edge part of several types of iron core sheet | seats in a lamination direction is not mutually parallel, it cannot shift | deviate to the radial direction of an iron core, and an accurate iron core shape is obtained.

Embodiment 2. FIG.
7 (a) and 7 (b) are plan views showing two types of core sheets 40 and 50 constituting a split laminated core according to Embodiment 2 of the present invention, and FIG. 8 shows the above two types of core sheets 40, It is a top view which shows the state which laminated | stacked 50. FIG. 7 and 8 show a state in which the iron core sheet is arranged in an annular shape.

  As shown in FIGS. 7 (a) and 7 (b), the abutting surface adjacent to the iron core sheet 40 or 50 is divided by the protrusions 40a and 50a having a dogleg shape. Moreover, the thin plate part 20 with which plate | board thickness became thin is formed in the front-end | tip of the square-shaped protrusion parts 40a and 50a, respectively. When these iron core sheets 40a and 50a are inserted with their respective thin plate portions 20 butted, they can be easily connected. Further, when the two types of iron core sheets 40 and 50 are alternately stacked, as shown by the solid line and the broken line in FIG. 8, the above-described protrusions 40 a and 50 a overlap each other in the stacking direction. Thus, since the shape of the connection edge part of multiple types of core sheet 40,50 in a lamination direction is not mutually parallel, it cannot shift to the radial direction of an iron core, and an accurate iron core shape is obtained.

Embodiment 3 FIG.
FIG. 9 is an enlarged cross-sectional view showing a place where split laminated iron cores according to Embodiment 3 of the present invention are connected.

  In the present embodiment, the number of the iron core sheets constituting the overlapping portions 60 and 70 of the adjacent divided laminated iron cores 10 is plural. And it is a part which corresponds to a corner | angular part or R part among the edge parts of these overlapping parts 60 and 70, Comprising: The thin plate by which the front-end | tip is formed thinner than the board thickness of an iron core sheet in the upper layer or lower layer among several iron core sheets A portion 20 is provided. Specifically, a triangular chamfered chamfered portion 20 is formed.

  Then, the overlapping portions 60 and 70 between the adjacent divided laminated cores 10 are inserted close to each other. At this time, smooth insertion becomes possible by alternately aligning the thin plate portions 20 formed at the corner edges of the overlapping portions 60 and 70 whose tips are thinner than the thickness of the iron core sheet.

Embodiment 4 FIG.
10 (a) to 10 (h) are plan views showing a punching process by pressing a laminated core according to Embodiment 4 of the present invention, and FIGS. 11 to 13 are enlarged plan views thereof.

  The press punching process of the present embodiment is a process of creating a plurality of divided laminated iron cores of the first embodiment at a time. That is, according to the pressing process of the present embodiment, it is possible to continuously punch a plurality of divided laminated cores in a state where they are arranged in an annular shape.

  First, the steps shown in FIG. 10A and FIG. 11A show a step of punching the rotor 102 from the inside of the iron core and the guide hole 101 for feeding the pressing step into the sheet material 100 such as a steel plate.

  Next, the process shown in FIGS. 10B and 11B includes a process of punching out the space 103 between the teeth of the iron core, and a matching hole 104 that is a relief hole for the next process outside the iron core. It is a process of providing. In addition, a groove 104a is formed in the matching hole 104 so that the next process can be easily cut.

  Next, in the steps shown in FIGS. 10 (c), 12 (c), 10 (d), and 12 (d), cuts 105 and 106 for separating the back yoke portions are provided for each tooth unit. It is a processing process. The positions of the straight lines 105 and 106 that become the breaks in the two steps (c) and (d) are different. The iron cores are stacked in the order of punching in the subsequent processes. However, the overlapping described in the first embodiment is performed when the cores are stacked by sequentially changing the positions of the cuts 105 and 106 in these two processes. A part can be formed.

  Next, the steps shown in FIGS. 10 (e) and 13 (e) and FIGS. 10 (f) and 13 (f) are steps for forming a half-cut dowel 107 for each core sheet to be divided. . Here, the half punching means that the sheet is left in the middle without being punched in the punching process of the sheet.

  Note that the step of forming the triangular chamfered chamfered portion 20 described in FIG. 2 by press molding can be performed before and after the steps of FIGS. 10E and 10F described above.

  Finally, as shown in FIGS. 10 (g) and 10 (h), by punching out the outer shape of the iron core along the matching hole 104, two types of annular core sheets with cut lines 105 and 106 are produced. . And the cyclic | annular iron core sheet | seat containing the cut | interruptions 105 and 106 from which a position differs is laminated | stacked alternately, and it respectively crimps and fixes according to the unevenness | corrugation of the said half punching dowel.

  The divided laminated iron core described in the above embodiment can be produced even by punching apart for each divided iron core. However, by punching the sheet material as a whole as in this embodiment, the inner diameter and the outer It can be manufactured integrally using a mold shape having a uniform diameter. As a result, the shape accuracy of the divided laminated iron core is good, and there is an effect that the accuracy of the inner diameter and outer diameter when combined can be further improved.

  There are two methods for attaching the windings to the laminated cores formed as described above: separating the divided laminated cores and then winding them, and increasing the pitch of the divided laminated cores without breaking them apart. There is a method of winding a coil. In any case, since the space for winding is enlarged, winding is facilitated, and further, an aligned winding is possible, and the winding density is improved.

It is a perspective view which shows the division | segmentation laminated | stacked iron core by Embodiment 1 of this invention. It is an enlarged view explaining the formation process of the chamfering part by Embodiment 1 of this invention. It is an expansion perspective view which shows the place which connects the division | segmentation laminated | stacked iron core by Embodiment 1 of this invention. It is the top view and partial sectional view which show the process of connecting the division | segmentation laminated | stacked iron core by Embodiment 1 of this invention. It is a top view which shows two types of iron core sheets which comprise the division | segmentation laminated | stacked iron core by Embodiment 1 of this invention. It is a top view which shows the state which laminated | stacked two types of iron core sheet | seats of FIG. It is a top view which shows two types of iron core sheets which comprise the division | segmentation laminated | stacked iron core by Embodiment 2 of this invention. It is a top view which shows the state which laminated | stacked two types of iron core sheets of FIG. It is an expanded sectional view which shows the place which connects the division | segmentation laminated | stacked iron core by Embodiment 3 of this invention. It is a top view which shows the punching process by the press of the laminated iron core by Embodiment 4 of this invention. It is an enlarged plan view which shows the punching process by the press of the laminated iron core by Embodiment 4 of this invention. It is an enlarged plan view which shows the punching process by the press of the laminated iron core by Embodiment 4 of this invention. It is an enlarged plan view which shows the punching process by the press of the laminated iron core by Embodiment 4 of this invention.

Explanation of symbols

10 divided laminated iron cores, 12 back yoke parts, 13 teeth parts,
15, 16, 17, 18, 40, 50 Iron core sheet,
15a, 16a, 17a, 18a, 40a, 50a, 60, 70 Overlapping part,
19a, 19b straight line, 20 thin plate part, 30 groove part.

Claims (2)

It is a laminated iron core configured by arranging divided laminated iron cores formed by laminating iron core sheets in an annular shape,
The divided laminated iron core includes a back yoke portion and a teeth portion extending radially inward from the back yoke portion,
The radially inner surface of the back yoke portion has a plane perpendicular to the teeth portion,
The back yoke portion has a back yoke portion of the divided laminated iron core adjacent in the circumferential direction and an overlapping portion in the lamination direction, and abuts on the divided laminated iron core adjacent in the circumferential direction at the end of the overlapping portion, The shape of the abutting end is different from the straight line passing through the core center at the time of annular arrangement when projected in the laminating direction, and has at least two different linear shapes depending on the laminating direction position, and the linear shape in the different direction Is a laminated iron core that, when projected in the laminating direction, intersects with the radially inner surface of the back yoke portion, and the mutual distance increases according to the distance from the iron core center. A method of manufacturing a laminated iron core in which divided laminated iron cores are arranged in a ring to form a laminated iron core,
A matching hole that is a relief hole for the next process, including a part of the outer periphery of the annular back yoke part, and an inner peripheral part of the back yoke part and a plurality of teeth parts extending radially inward from the back yoke part An initial forming step of punching on the iron core sheet,
Between the location where the matching hole is formed and the space formed by the punching surrounded by the adjacent teeth portion and the inner peripheral portion of the back yoke portion, the periphery of the back yoke portion is provided for each iron core sheet. A first dividing surface forming step for forming a first dividing surface having a first linear shape in units of one tooth in a direction; and a second dividing surface having a second linear shape different from the first dividing surface. A split surface forming step for carrying out the two split surface forming step;
The outer periphery of the back yoke portion separated on the dividing surface is punched out, and the first yoke arranged in an annular shape is separated from each other on the first dividing surface in units of the back yoke portion and the tooth portion extending to the back yoke portion. A split core sheet forming step of forming a core sheet and a second core sheet that is separated from each other on the second split surface and arranged annularly;
A divided stack in which the first core sheet and the second core sheet are provided in an overlapping manner in the stacking direction at the end of each back yoke portion, and a plurality of sheets are stacked while maintaining the array, and are arranged in an annular shape. A lamination process for forming an iron core,
In the initial formation step, the radially inner surface of the back yoke portion is formed in a planar shape perpendicular to the teeth portion,
The first and second linear shapes of the dividing surface forming step do not pass through the center of the core when the divided laminated cores are arranged in an annular shape when projected in the stacking direction, and the first linear shape and the first linear shape. A method of manufacturing a laminated iron core, wherein two straight lines intersect on the inner boundary in the radial direction of the back yoke portion, and the mutual distance increases according to the distance from the iron core center.

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