JPWO2019123513A1 - Stator core and electric motor having the stator core - Google Patents

Abstract

The stator core is configured by laminating a plurality of electromagnetic steel sheets, and includes a ring-shaped core back portion, and a plurality of teeth portions that extend inward from the core back portion and around which windings are wound. There is. The core back portion includes a first caulking joint portion in which electromagnetic steel sheets adjacent to each other in the laminating direction are caulked and fixed to each other, and a first flat plate portion in which electromagnetic steel sheets adjacent to each other in the laminating direction are not caulked to each other. They are arranged alternately along the direction. A second caulking joint, in which the electromagnetic steel sheets adjacent to each other in the laminating direction are caulked and fixed to each other, is provided on the magnetic steel sheet having the first flat plate portion in the tooth portion, and the electromagnetic steel sheets adjacent to each other in the laminating direction. The second flat plate portion, which is not crimp-bonded to each other, is provided on the electromagnetic steel sheet having the first crimp-bonded portion.

Description

  The present invention relates to a stator core formed by laminating a plurality of electromagnetic steel sheets, and an electric motor including the stator core.

  2. Description of the Related Art Conventionally, a stator core is known as one that constitutes a stator used in, for example, an electric motor. The stator core is formed by laminating a plurality of electromagnetic steel sheets, and includes an annular core back portion and a plurality of teeth portions extending inward from the core back portion. The teeth are insulated and wound.

  The stator core has a configuration in which electromagnetic steel sheets adjacent in the laminating direction are caulked at a core back portion and a tooth portion. However, in the stator core, the magnetic permeability is reduced or the insulating layer is destroyed due to the strain due to the press-fitting of the convex and concave portions of the caulking in the teeth portion and the stress due to the press-fitting, and the fractured surfaces of the electromagnetic steel sheets come into contact with each other. This may cause eddy currents between the layers. Therefore, the magnetic characteristics of the stator core are degraded due to an increase in iron loss, which may adversely affect the motor characteristics of the electric motor. On the other hand, if the stator core is not caulked to the teeth, the stator core deforms as if it were shrunk by the tension of the winding and collapsed. Due to this shrinkage of the stator core, a winding disturbance in which the winding cannot be wound at a target position occurs, and a dead space that cannot be wound in a space where the winding can be wound normally occurs. For this reason, the stator core has a problem that the winding cannot be sufficiently wound and efficiency loss occurs.

  For example, in Patent Literature 1, a region having a caulked joint portion where electromagnetic steel plates are caulked and fixed, and a region having no caulked joint portion are provided in the teeth portion, and the caulked joint portion of the teeth portion is provided. A reduced configuration stator core is disclosed.

JP 2013-59262 A

  In the stator core disclosed in Patent Literature 1, all electromagnetic steel sheets adjacent to each other in the laminating direction in the core back portion are caulked. For this reason, in this stator core, there is a possibility that the strong pressure of the wound winding acts on the swaged joint portion provided partially in the tooth portion. In other words, in this stator core, the caulking joint provided in the teeth portion is crushed by the pressure of the winding, and the lamination width on the teeth portion changes, thereby causing the winding to shrink. There is a possibility that winding disturbance may occur.

  The present invention has been made in order to solve the above-described problem, and suppresses distortion due to press-fitting of convex and concave portions of a caulking in a tooth portion and stress due to press-fitting, and also suppresses winding shrinkage by a winding. It is an object of the present invention to provide a stator core that can be used and a motor provided with the stator core.

  The stator core according to the present invention is configured by laminating a plurality of electromagnetic steel sheets, an annular core back portion, and a plurality of teeth portions extending inward from the core back portion and wound with windings. Wherein the core back portion comprises: a first caulked joint in which the electromagnetic steel sheets adjacent in the laminating direction are caulked and fixed to each other; and the electromagnetic steel sheet adjacent in the laminating direction. The first flat plate portions, which are not caulked, are provided alternately along the laminating direction, and the electromagnetic steel plates adjacent in the laminating direction are caulked and fixed to the teeth portion. The second caulked joint portion is provided on the electromagnetic steel sheet having the first flat plate portion, and the second flat plate portion where the adjacent electromagnetic steel sheets in the laminating direction are not caulked is the first flat plate portion. With swaging joint That the one in which is provided an electromagnetic steel sheet.

  According to the present invention, since the second flat plate portion in which the electromagnetic steel sheets adjacent in the laminating direction are not caulked in the teeth portion is provided, distortion due to press-fitting of the convex and concave portions of caulking and stress due to press-fitting are reduced. The influence can be suppressed. Further, in the present invention, the first caulking joint portion and the first caulking joint portion are connected to the core back portion so that the lamination width of the core back portion is substantially equal to the lamination width of the tooth portion to which tension is applied by winding the winding. Since the flat plate portion is provided, and the teeth portion is provided with the second caulking joint portion and the second flat portion, the winding shrinkage of the winding can be suppressed.

It is a longitudinal section of the electric motor provided with the stator core concerning an embodiment of the invention. FIG. 2 is a plan view showing a stator including a stator core according to an embodiment of the present invention. It is the top view explaining the connection structure of the segment which comprises the stator core which concerns on embodiment of this invention. It is a top view showing the modification of the stator provided with the stator core concerning an embodiment of the invention. It is a top view showing a different modification of the stator provided with the stator core concerning an embodiment of the invention. It is a longitudinal section of a stator core concerning an embodiment of the invention. FIG. 2 is an explanatory diagram showing a stator core according to an embodiment of the present invention, showing a relationship between a first caulking joint and a first through hole. FIG. 3 is a plan view showing one example of types of electromagnetic steel sheets constituting a stator core according to an embodiment of the present invention. FIG. 3 is a plan view showing one example of types of electromagnetic steel sheets constituting a stator core according to an embodiment of the present invention. FIG. 3 is a plan view showing one example of types of electromagnetic steel sheets constituting a stator core according to an embodiment of the present invention. FIG. 3 is a plan view showing one example of types of electromagnetic steel sheets constituting a stator core according to an embodiment of the present invention. It is explanatory drawing which showed roughly the principal part of the metal mold | die for forming a 1st caulking joining part in an electromagnetic steel plate. It is explanatory drawing which showed roughly the principal part of the metal mold | die for forming a 1st caulking joining part in an electromagnetic steel plate. It is explanatory drawing which showed the stator iron core which has a crimp connection part only in a core back part. FIG. 11 is an explanatory view showing a state in which tension by winding acts on the stator core shown in FIG. 10.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters, and description thereof will be omitted or simplified as appropriate. Further, the configuration, size, arrangement, and the like of the configuration shown in each drawing can be appropriately changed within the scope of the present invention.

Embodiment.
FIG. 1 is a longitudinal sectional view of an electric motor including a stator core according to an embodiment of the present invention. FIG. 2 is a plan view showing a stator having a stator core according to the embodiment of the present invention. As shown in FIG. 1, a stator core 1 according to the present embodiment constitutes a stator 10 used for an electric motor 100. The electric motor 100 includes an annular stator 10 fixedly supported on the inner wall surface of the hermetic container 100a by shrink fitting or the like, and a rotor 20 rotatably provided facing the inner surface of the stator 10. Have been.

  As shown in FIG. 1, rotor 20 is inserted into a rotor core 21 formed by laminating a plurality of electromagnetic steel sheets 2 punched into a predetermined shape, and an insertion hole formed in rotor core 21. And a permanent magnet 22. When the electric motor 100 is incorporated in the compressor, for example, the rotor 20 is fixed to the shaft 23 of the compression mechanism by shrink fitting or the like. The rotor 20 rotates by receiving a rotating force from a rotating magnetic field generated by the stator 10.

  As shown in FIGS. 1 and 2, the stator 10 includes a stator core 1 and windings 14 wound around the stator core 1. The stator core 1 is formed, for example, by laminating a plurality of thin electromagnetic steel sheets 2 having a plate thickness of about 0.1 mm to 0.7 mm, and includes a core back portion 3 formed in an annular shape, and a core back. A plurality of teeth portions 4 extending inward from the portion 3 and around which the windings 14 are wound.

  FIG. 3 is a plan view illustrating the connection structure of the segments constituting the stator core according to the embodiment of the present invention. As shown in FIGS. 2 and 3, the stator core 1 is configured by connecting the core back portion 3 to nine substantially T-shaped segments 11 (divided cores) obtained by dividing the core back portion 3 into nine pieces in the annular direction. . The core back portion 3 has a connecting portion 13 in which adjacent segments 11 are rotatably connected to the adjacent segments 11. Specifically, the electromagnetic steel plates 2 in the core back portions 3 of the adjacent segments 11 alternately overlap each other at the end of the core back portion 3, and a common pin hole is formed in the overlapping portion, and a pin is formed in the pin hole. It is inserted and pin-connected. Therefore, the stator core 1 according to the present embodiment can be changed into various shapes such as an annular shape or a straight shape opposite to that of FIG. A work space for winding 14 can be secured. In addition, the adjacent segments 11 may have a configuration in which an uneven fitting portion that fits into each other is provided at an end of the core back portion 3 and is rotatably connected. In short, another configuration may be used as long as the segments 11 adjacent in the annular direction are rotatably connected to the adjacent segments 11.

  FIG. 4 is a plan view showing a modified example of the stator including the stator core according to the embodiment of the present invention. As shown in FIG. 4, the core back portion 3 may be configured to have a welded portion 15 in which the segments 11 adjacent in the annular direction are welded and connected. In this case, since the stator core 1 can improve the accuracy of the roundness on the inner diameter side of the teeth portion 4, when the electric motor 100 is incorporated in the compressor, for example, it contributes to the improvement of the operating efficiency of the compressor. be able to.

  FIG. 5 is a plan view showing a different modification of the stator including the stator core according to the embodiment of the present invention. The core back portion 3 is not limited to the configuration in which the segments 11 divided in the annular direction are connected as described above, and may be implemented in a configuration integrally formed in an annular shape as shown in FIG.

  As shown in FIG. 1, each segment 11 is insulated by an insulating material 12 such as paper or a resin sheet having an insulating function. A winding 14 is wound around the teeth 4 of each segment 11 from above the insulating material 12. A slot is formed between the adjacent teeth portions 4, and the slot serves as a storage space for the winding 14. As the winding 14, a magnet wire or the like in which an insulating coating is applied to the outside of a copper wire is used.

  FIG. 6 is a longitudinal sectional view of the stator core according to the embodiment of the present invention. As shown in FIGS. 1, 2, and 6, the core back portion 3 of each segment 11 is formed by caulking and joining two adjacent electromagnetic steel plates 2 in the laminating direction at two positions. The portions 5 and the first flat plate portions 6 in which the magnetic steel sheets 2 adjacent in the laminating direction are not caulked are alternately arranged along the laminating direction. The first caulking joint 5 is configured as a first caulking assembly 50 in which a plurality of electromagnetic steel sheets 2 adjacent in the laminating direction are continuously provided. Note that FIG. 1 shows a configuration in which the first caulking joints 5 are formed continuously in four stages, and FIG. 6 shows a configuration in which the first caulking joints 5 are formed continuously in nine stages.

  On the other hand, as shown in FIG. 6, the teeth portion 4 of each segment 11 is provided with a second caulking joint 7 to which the electromagnetic steel plates 2 adjacent in the laminating direction are caulked and fixed, and the first flat plate portion 6 is fixed. It is provided on the magnetic steel sheet 2 having the same. Further, the teeth portion 4 of each segment 11 is provided with a second flat plate portion 8 in which the electromagnetic steel plates 2 adjacent to each other in the laminating direction are not caulked and joined to the electromagnetic steel plate 2 having the first caulked joint portion 5. Have been. The second caulking joint 7 is configured as a second caulking assembly 70 in which a plurality of electromagnetic steel sheets 2 adjacent in the laminating direction are continuously fixed. FIG. 1 shows a configuration in which the second caulking joints 7 are formed in four consecutive steps, and FIG. 6 shows a configuration in which the second caulking joints 7 are formed in nine consecutive steps.

  The first caulking joint 5 and the second caulking joint 7 are configured such that the lamination width of the core back portion 3 and the lamination width of the teeth portion 4 to which the tension F is applied by the winding of the windings 14 are substantially equal. It shall be formed in shape and number.

  Here, the caulking connection will be described. In the stator core 1 of the present embodiment, the electromagnetic steel sheet 2 is cut and bent, and the first caulked joint portion 5 by V-caulking for fastening a plurality of electromagnetic steel sheets 2 by projections having a thickness or more is a core back. A second caulking joint 7 by V-caulking is applied to the teeth 4. As another caulking, there is a configuration in which a circular protrusion called a round caulking is formed, and magnetic plates adjacent in the laminating direction are fastened in a press-fit relationship. Further, as similar shapes of the circular caulking, there are a round V-shaped caulking in which a semicircle is obliquely deformed, and a square caulking similar to a round caulking as a caulking having a plate thickness or less.

  V caulking has a larger fastening force at the same joint area than round caulking or the like, but the gap between the laminations tends to increase. In addition, any of the above-described crimping methods is a fastening method utilizing press-fitting of a crimping deformed portion, and has a disadvantage that the distortion and stress of the stator core due to press-fitting of the convex portion and the concave portion increase, and the magnetic characteristics deteriorate.

  In the stator core 1 of the present embodiment, the electromagnetic steel plates 2 of the respective segments 11 are joined by V-caulking, and the number of caulkings is reduced to suppress distortion and stress due to press-fitting of the convex and concave portions. However, it is not limited to V caulking and may be round caulking or square caulking.

  As shown in FIG. 1 and FIG. 6, the stator core 1 of the present embodiment is configured such that the electromagnetic steel sheet 2 located below the first caulking joint 5 at the lowermost stage of the first caulking assembly 50 is A first through hole 30 into which the one caulking joint 5 is fitted is formed. This prevents the interference between the first caulking joint 5 and the upper surface of the electromagnetic steel plate 2 by fitting the first caulking joint 5 located at the lowermost stage into the first through hole 30, and increases the gap between the laminations. It is to prevent. Similarly, in the stator core 1 of the present embodiment, the second caulking joint 7 is fitted to the electromagnetic steel plate 2 located below the second caulking joint 7 at the lowermost stage of the second caulking assembly 70. A second through hole 40 to be inserted is formed.

  FIG. 7 is an explanatory view showing a stator core according to the embodiment of the present invention, showing a relationship between a first caulking joint and a first through hole. The first through hole 30 is formed in one magnetic steel sheet 2 when the relation between the thickness h of the magnetic steel sheet 2 and the crimping depth y is h ≧ y. On the other hand, as shown in FIG. 7, when the relationship between the thickness h of the electromagnetic steel sheet 2 and the crimping depth y is h <y, as shown in FIG. It is necessary to form the magnetic steel sheet 2 (three sheets in the illustrated example). This is to prevent a situation in which the gap between the laminations of the electromagnetic steel sheets 2 increases due to the tip of the first caulking joint 5 protruding from the first through hole 30. The same applies to the relationship between the second caulking joint 7 and the second through hole 40.

  Note that the relationship between the thickness h of the electromagnetic steel sheet 2 and the crimping depth y is h <y, and when k electromagnetic steel sheets 2 forming the first through holes 30 are required, the first penetration It is desirable to provide the second crimping joint 7 on the lower electromagnetic steel sheet 2 including the lowermost electromagnetic steel sheet 2 among the k electromagnetic steel sheets 2 in which the holes 30 are formed. Similarly, when k electromagnetic steel plates 2 forming the second through holes 40 are required, the lowermost electromagnetic steel plate 2 is included among the k electromagnetic steel plates 2 having the second through holes 40 formed therein. It is desirable to provide the first crimping joint 5 on the lower electromagnetic steel plate 2. This is to reduce unnecessary first and second caulked joints 5 and 7.

  Next, the setting of the number m of the positions where the first swaging assembly 50 and the second swaging assembly 70 are switched will be described. The total number of the electromagnetic steel sheet 2 having the first through hole 30 formed in the core back portion 3 and the electromagnetic steel sheet 2 having the second through hole 40 formed in the teeth portion 4 is equal to the first caulking assembly 50 and the second caulking Assuming that the number of positions at which the aggregate 70 is switched is m, the number of positions is m. When the number m of times at which the first swaging assembly 50 and the second swaging assembly 70 are interchanged is large, the stator core 1 has a through hole formed in the core back portion 3 or the teeth portion 4 by that much. And the magnetic properties may be degraded. Therefore, in the stator core 1, it is desirable that the number m of the positions at which the first swaging assembly 50 and the second swaging assembly 70 are exchanged be minimized.

  On the other hand, as shown in FIG. 6, when the total number n of the electromagnetic steel sheets 2 is n, the amount of winding shrinkage H with respect to the gap X between the laminations of the first caulking joints 5 is (D1−D2) / 2. Here, D1 is (the number of the electromagnetic steel sheets 2 having the first caulked joints 5) × (sheet thickness h) + (total of the gaps X of the lamination in the electromagnetic steel sheets 2 having the first caulked joints 5). Therefore, [(nm) / (m + 1)] × h + {[(nm) −1] / (m + 1)} × X. On the other hand, since D2 is (the number of the electromagnetic steel plates 2 having the first caulked joints 5) × (plate thickness h), it is [(nm) / (m + 1)] × h. Therefore, since the winding shrinkage amount H is (D1−D2) / 2, it becomes {[(nm) −1] / (m + 1)} × (X / 2). That is, in the stator core 1, since the amount of winding shrinkage H is inversely proportional to m, there is a disadvantage that when the number of times m is small, H increases. In consideration of such characteristics, the stator core 1 needs to arbitrarily set the value of m to a required standard.

  Next, the configuration of the electromagnetic steel sheet according to the present embodiment will be described with reference to FIGS. 8A to 8D. 8A to 8D are plan views showing an example of the types of electromagnetic steel sheets constituting the stator core according to the embodiment of the present invention. The electromagnetic steel sheet 2 shown in FIG. 8A has a configuration in which the core back portion 3 is provided with the first caulking joint portion 5. The electromagnetic steel sheet 2 shown in FIG. 8B has a configuration in which a first through hole 30 is formed in the core back portion 3 and a second caulking joint 7 is provided in the teeth portion 4. The electromagnetic steel sheet 2 shown in FIG. 8C has a configuration in which the teeth portion 4 is provided with the second caulking joint 7. The electromagnetic steel sheet 2 shown in FIG. 8D has a configuration in which a first caulking joint portion 5 is provided in the core back portion 3 and a second through hole 40 is formed in the teeth portion 4. 8A, 8B, 8C, and 8D, or the order of FIGS. 8C, 8D, 8A, and 8B. It is composed by stacking. 8A to 8D, for example, as shown in FIG. 1, the electromagnetic steel sheets 2 having the same configuration may be continuously stacked.

  The first caulked joint 5 in the present embodiment is not limited to a configuration in which the first caulked assembly 50 is formed by continuously providing the electromagnetic steel sheets 2 adjacent in the laminating direction in a plurality of stages. Although illustration is omitted, for example, the first caulking joints 5 may be provided on every other electromagnetic steel sheet 2 in the laminating direction.

  Next, a forming method for forming the first caulked joint 5 and the second caulked joint 7 of the stator core 1 according to the present embodiment on the electromagnetic steel plate 2 will be described with reference to FIGS. 9A and 9B. FIG. 9A and FIG. 9B are explanatory views schematically showing a main part of a mold for forming a first caulking joint on an electromagnetic steel sheet. As shown in FIGS. 9A and 9B, the first caulking joint 5 is formed by a mold 200 having a cam mechanism 201 and a forming punch 202 that moves up and down with respect to the cam mechanism 201. In the mold 200, the forming punch 202 moves up and down from the state shown in FIG. 9A by the cam mechanism 201 which moves in the left-right direction as shown in FIG. 9B. This is a configuration in which a caulking joint 5 is formed. After forming the first caulked joints 5 one by one by the mold 200, the electromagnetic steel sheets 2 are caulked and joined by overlapping a plurality of them. The formation of the second caulked joint 7 on the electromagnetic steel plate 2 is also performed by the mold 200 in the same manner.

  Here, the configuration and problems of the stator core having the caulked joint portion 9 only in the core back portion 3 will be described with reference to FIGS. 10 and 11. FIG. 10 is an explanatory diagram showing a stator core having a swaged joint only in a core back portion. FIG. 11 is an explanatory diagram showing a state in which the tension by the winding acts on the stator core shown in FIG. 10. In the stator core 1, as shown in FIG. 10, a gap is formed between the lamination of the core back portion 3 and the teeth portion 4 by the caulking joint portion 9. For this reason, as shown in FIG. 11, when the winding is wound around the teeth portion 4 and the tension F acts, the core back portion 3 maintains the lamination gap at the caulking joint portion 9, but the teeth portion 4 The wire is contracted by the tension F of the wire 14. The magnetic steel sheet 2 bends from the core back portion 3 toward the teeth portion 4 due to this winding shrinkage. Then, the tips on the inner diameter side of the adjacent tooth portions 4 in the laminating direction are deformed so that there is no gap between the adjacent tooth portions 4. When the stator core 1 undergoes winding contraction, the winding 14 cannot be wound to a target position, and a manufacturing defect such as winding disorder occurs, which affects manufacturing quality.

  Further, since the inner diameter side of the stator core 1 is deformed by the winding and shrinking, when the segments 11 are arranged in an annular shape, the outer diameter and the inner diameter become barrel-shaped. For this reason, the inner diameter roundness and cylindricity of the stator core 1 are deteriorated, and the air gap between the rotor 20 and the stator 10 becomes nonuniform, which may adversely affect motor characteristics.

  Therefore, the core back portion 3 of the stator core 1 according to the present embodiment includes a first caulked joint portion 5 in which electromagnetic steel plates 2 adjacent in the laminating direction are caulked and fixed to each other, and an electromagnetic steel plate adjacent in the laminating direction. The first flat plate portions 6, which are not caulked, are provided alternately along the laminating direction. The teeth portion 4 is provided with a second caulked joint 7 to which the electromagnetic steel plates 2 adjacent in the laminating direction are caulked and fixed to each other, and is provided on the electromagnetic steel plate 2 having the first flat plate portion 6. I have. Further, the teeth portion 4 is provided with a second flat plate portion 8 in which the electromagnetic steel plates 2 adjacent in the laminating direction are not caulked and joined to the electromagnetic steel plate 2 having the first caulked joint portion 5.

  That is, since the stator core 1 of the present embodiment has the second flat plate portion 8 in which the electromagnetic steel plates adjacent in the laminating direction are not caulked in the teeth portion 4, the convex portion and the concave portion of the caulked joint are provided. And the influence of stress due to the press-fitting can be suppressed. Therefore, the stator core 1 can suppress a decrease in the magnetic permeability and an eddy current generated between the laminations.

  Further, the stator core 1 of the present embodiment has a core back so that the lamination width of the core back portion 3 and the lamination width of the teeth portion 4 to which tension is applied by the winding of the windings 14 are substantially equal. Since the first crimping joint 5 and the first flat plate 6 are provided in the portion 3 and the second crimping joint 7 and the second flat plate 8 are provided in the teeth 4, the winding shrinkage of the winding 14 is suppressed. Can be. That is, since the stator core 1 can wind the winding 14 to a target position, manufacturing defects such as winding disorder can be reduced. Further, since the stator core 1 can improve the winding quality, the number of rework steps and in-process defects can be reduced, and a high-quality electric motor 100 can be provided.

  Further, the first caulked joint portion 5 of the stator core 1 according to the present embodiment is configured as a first caulked assembly 50 in which a plurality of electromagnetic steel sheets 2 adjacent in the laminating direction are continuously provided in a plurality of stages. In addition, the second caulking joint 7 is configured as a second caulking assembly 70 in which electromagnetic steel sheets 2 adjacent in the laminating direction are continuously fixed in a plurality of stages. That is, the stator core 1 can suppress the deterioration of the magnetic characteristics caused by the formation of the through holes in the core back portion 3 and the teeth portion 4.

  In the stator core 1 of the present embodiment, the first caulked joint 5 is fitted to the electromagnetic steel plate 2 located below the first caulked joint 5 at the lowermost stage of the first caulked assembly 50. A first through hole 30 is formed. Further, a second through hole 40 is formed in the electromagnetic steel plate 2 located below the second caulking joint 7 at the lowermost stage of the second caulking assembly 70 so as to fit the second caulking joint 7. Therefore, the stator core 1 prevents interference between the first caulking joint 5 and the upper surface of the electromagnetic steel plate 2 by fitting the first caulking joint 5 located at the lowermost stage into the first through hole 30. Since the second caulked joint 7 located at the lowermost stage is fitted into the second through hole 40, interference between the second caulked joint 7 and the upper surface of the electromagnetic steel plate 2 can be prevented. The gap between them can be prevented from increasing.

  Further, since the stator core 1 of the present embodiment has a configuration in which the segments 11 adjacent in the annular direction have the connecting portions 13 rotatably connected to the adjacent segments 11, each of the segments 11 is By rotating, it can be changed into various shapes such as an annular shape or a straight shape opposite to that of FIG. Therefore, the stator core 1 can secure a working space for winding the winding 14, and can easily wind the winding 14.

  In addition, the stator core 1 of the present embodiment has a configuration in which the segments 11 adjacent to each other in the annular direction are welded and connected to each other, so that the roundness on the inner diameter side of the teeth portion 4 is obtained. For example, when the electric motor 100 is incorporated in the compressor, it is possible to contribute to improvement in the operation efficiency of the compressor. In addition, since the stator core 1 requires only a small number of members and labor for processing, the productivity can be improved.

  In addition, the stator core 1 of the present embodiment has a configuration in which the teeth portion 4 is insulated by an insulating material 12 made of a paper material or a resin sheet having an insulating function and wound around a winding 14. The insulation between the winding 14 and the teeth 4 is improved.

  Although the present invention has been described based on the embodiment, the present invention is not limited to the configuration of the above-described embodiment. For example, the number of the first caulking joints 5 constituting the first caulking assembly 50 and the number of the second caulking joints 7 constituting the second caulking assembly 70 may not be the same. In the stator core 1, the lamination width of the core back portion 3 and the lamination width of the teeth portion 4 to which the tension F is applied by the winding of the winding wire 14 may be substantially equal. In short, it should be noted that various changes, applications, and uses made by those skilled in the art as necessary are also included in the gist (technical range) of the present invention.

  REFERENCE SIGNS LIST 1 stator core, 2 electromagnetic steel sheet, 3 core back portion, 4 teeth portion, 5 first caulked joint, 6 first flat plate, 7 second caulked joint, 8 second flat plate, 9 caulked joint, 10 Stator, 11 segments, 12 insulating materials, 13 connecting portions, 14 windings, 15 welds, 20 rotors, 21 rotor cores, 22 permanent magnets, 23 shaft portions, 30 first through holes, 40 second through holes , 50 first swaging assembly, 70 second swaging assembly, 100 electric motor, 100a closed container, 200 mold, 201 cam mechanism, 202 forming punch.

Claims (7)

A plurality of electromagnetic steel sheets are laminated, and the stator core includes an annular core back portion, and a plurality of teeth portions extending inward from the core back portion and wound with windings. So,
The core back portion,
A first caulked joint in which the electromagnetic steel sheets adjacent in the laminating direction are caulked and fixed, and a first flat plate part in which the electromagnetic steel sheets adjacent in the laminating direction are not caulked are formed along the laminating direction. Are arranged alternately,
In the teeth part,
A second caulked joint in which the electromagnetic steel sheets adjacent to each other in the laminating direction are caulked and fixed is provided on the electromagnetic steel sheet having the first flat plate part,
A stator core, wherein a second flat plate portion in which the electromagnetic steel plates adjacent in the laminating direction are not caulked is provided on the electromagnetic steel plate having the first caulked joint. The first caulking joint is configured as a first caulking assembly in which the electromagnetic steel sheets adjacent in the laminating direction are provided continuously in a plurality of stages,
2. The stator core according to claim 1, wherein the second caulking joint is configured as a second caulking assembly in which the electromagnetic steel sheets adjacent in the laminating direction are continuously fixed in a plurality of stages. 3. A first through hole is formed in the electromagnetic steel sheet located below the first caulking joint at the lowermost stage of the first caulking assembly, into which the first caulking joint is fitted.
The second through-hole into which the second caulking joint is fitted is formed in the electromagnetic steel sheet located below the second caulking joint at the lowermost stage of the second caulking assembly. The stator core described in the above. The core back portion is composed of a plurality of segments divided in an annular direction,
The stator core according to any one of claims 1 to 3, wherein the segments that are adjacent in the annular direction each have a connecting portion that is rotatably connected to the adjacent segment. The core back portion is composed of a plurality of segments divided in an annular direction,
The stator core according to any one of claims 1 to 3, wherein the segments adjacent to each other in the annular direction have a welded portion connected by welding. The teeth portion is insulated by an insulating material made of a paper material or a resin sheet having an insulating function,
The stator core according to any one of claims 1 to 5, wherein the winding is wound around the teeth portion on which the insulation treatment is performed.   An electric motor comprising the stator core according to claim 1.

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