JP2010028885A - Core for rotating electrical machines - Google Patents

Abstract

In a core for a rotating electrical machine, it is possible to sufficiently secure an unloading load when a core part is dropped from a fixing member while suppressing a large amount of fitting white between the fixing member and the core part. That is.
A stator core for a rotating electrical machine includes a cylindrical core fixing member called an outer peripheral ring and a cylindrical core portion having a circular outer peripheral shape fitted and fixed thereto. The cylindrical core portion 14 is an electromagnetic steel plate, a unidirectional burr thin plate 20 in which the direction of burrs 24 and 26 generated when the outer peripheral shape is formed is directed in one direction along the axial direction of the cylindrical shape of the core fixing member 12. And the other-direction burr thin plate 22 facing in the other direction. The difference between the number of laminated unidirectional burr thin plates 20 and the number of laminated unidirectional burr thin plates 22 is the difference in the number of laminated layers within a predetermined range.
[Selection] Figure 1

Description

  The present invention relates to a rotating electrical machine core, and more particularly, to a rotating electrical machine core in which a cylindrical core portion is fitted and fixed to a cylindrical core fixing member.

  A stator core of a rotating electrical machine can be formed by laminating a plurality of thin plates such as electromagnetic steel plates that are formed by press working and pressing them into a cylindrical ring or frame and fixing them. For example, in Patent Document 1, as an electric motor stator, in order to suppress an increase in hysteresis loss due to compressive stress when the stator is attached to an iron or aluminum frame by shrink fitting or press fitting, in-plane It is disclosed that a non-oriented electrical steel sheet having a magnetic property close to isotropic is used, an easy magnetization direction is arranged in parallel to the direction in which the compressive stress acts, and the compressive stress is designed to be 50 MPa or less. .

  In this way, when pressing a thin plate such as an electromagnetic steel sheet, the material flows in the direction of punching in the press process, a burr that protrudes in the direction of punching occurs, and the opposite side of the surface on which the burr is generated Sagging occurs on the surface.

  For example, in Patent Document 2, when a plurality of iron cores are stacked as a stator of an electric motor for a compressor, in order to secure a squareness by the axis of the iron core, if each iron core is turned upside down and stacked, A configuration is disclosed in which the hole fits with the caulking protrusion on the other side. Here, for example, when 98 sheets are stacked, half of the 49 sheets are reversed and integrated by caulking, and the other 49 sheets are integrated with the burr facing each other and facing each other, It is described that they are integrated by welding.

  Further, Patent Document 3 discloses a configuration in which the burr of the outermost layer of the iron core of the motor in which the block pieces obtained by punching the thin metal pieces are stacked is prevented from facing outward in the outermost layer of these block pieces. Yes. Accordingly, it is stated that when the insulating paint is applied to the portion where the winding is wound, since there is no burr in the outer layer, it can be applied uniformly.

  In Patent Document 4, as a laminated structure of a core for a rotating electrical machine, when laminating thin electromagnetic steel sheets that are insulated on both sides in order to reduce eddy current loss that occupies most of iron loss, It is stated that the relationship between the plate thickness t21 of the rotor core material at the outer periphery of the rotor, the plate thickness t1 of the electromagnetic steel plate, and the burr height t31 of the burr generated at the time of punching is t21 <t1-t31. ing. In this way, it is stated that the generation of eddy current can be suppressed by limiting the plate thickness t21 of the outer peripheral portion of the rotor, and that the burrs do not come into contact with the adjacent insulated steel sheet to reduce the insulation. ing. Here, it is described that the side opposite to the burr surface is a sag surface, the burrs and the sag surface are stacked in the same direction, and the burrs and the sag are stacked facing each other.

JP 2007-336690 A JP 2003-180043 A JP-A-9-191614 JP 2004-140966 A

  As described above, in the prior art, in the lamination of thin plates used for the cores of rotating electrical machines, if burrs occur during thin plate processing, ensuring perpendicularity by the axis of the core, ensuring uniform application of insulating paint, suppressing eddy currents It is pointed out that problems arise in

  By the way, when a core portion such as a laminated thin plate is fitted and supported by a fixing member such as a ring, the core portion may drop from the fixing member due to an impact or the like. When burrs are generated in the laminated thin plate constituting the core part, the direction of falling off from the fixing member, that is, the direction in which the core part is pulled out is often biased to one side. This is because the pull-out load in the opposite direction, that is, the direction in which the sagging occurs is lower than the pull-out load in the direction in which burrs are generated, that is, the direction in which the material protrudes.

  As described above, in order to prevent the core portion formed of the laminated steel plates from falling off the fixing member, it is only necessary to increase the fitting force between the core portion and the fixing member by taking a large amount of fitting white. However, as suggested in Patent Document 1, when the fitting is strengthened, the compressive stress generated in the core portion increases, and the magnetic characteristics of the core portion may be deteriorated.

  An object of the present invention is to provide a core for a rotating electrical machine that can sufficiently secure a slip-off load when the core portion is dropped from the fixing member while suppressing a large amount of fitting white between the fixing member and the core portion. It is to be.

  The core for a rotating electrical machine according to the present invention has a cylindrical core fixing member and an outer dimension corresponding to the inner dimension of the cylindrical shape of the core fixing member, and is a cylinder that is fitted and fixed to the core fixing member. The cylindrical core portion is composed of a plurality of members, and the direction of the burr of the portion fitted to the core fixing member of each member is different among the members.

  Moreover, in the core for a rotating electrical machine according to the present invention, the cylindrical core portion is formed by laminating thin plates having partial shapes divided by a predetermined number along the circumferential direction of the cylindrical shape as a plurality of members. The plurality of divided cores are formed such that the direction of burrs generated when forming the outer shape of the partial shape is directed in one direction along the axial direction of the cylindrical shape of the core fixing member. The one-way laminated core is disposed so as to face the other direction, and the one-way laminated core and the other-directional laminated core are adjacent to each other. It is preferable to arrange in the circumferential direction and to be fixed to the core fixing member.

  Moreover, in the core for a rotating electrical machine according to the present invention, the cylindrical core portion is composed of a plurality of core thin plates having the same outer peripheral shape as the outer peripheral shape of the cylindrical core portion and laminated in the axial direction as a plurality of members. The plurality of core thin plates includes a unidirectional burr thin plate in which the direction of the burr generated when forming the outer peripheral shape is directed in one direction along the axial direction of the cylindrical shape of the core fixing member, and the unidirectional burr in the other direction. The difference between the number of laminated unidirectional burr thin plates and the number of laminated other direction burr thin plates is preferably a difference in the number of laminated layers within a predetermined range.

  The core for a rotating electrical machine according to the present invention has a cylindrical core fixing member and an outer dimension corresponding to the inner dimension of the cylindrical shape of the core fixing member, and is fitted and fixed to the core fixing member. A cylindrical core portion, and a retaining portion provided at one end in the axial direction of the core fixing member to prevent the cylindrical core portion from coming off in the axial direction. Including a plurality of core thin plates arranged so that the direction of burrs generated when molding the core is directed in one direction along the axial direction of the cylindrical shape of the core fixing member. The core thin plate is characterized in that the direction of the burr is directed to the other end portion in the axial direction of the core fixing member.

  According to at least one of the above-described configurations, the rotating electrical machine core includes a cylindrical core fixing member and a cylindrical core portion that is fitted and fixed to the cylindrical core fixing member, and the plurality of members constituting the cylindrical core portion are The direction of the burr of the portion that fits into the core fixing member of each member differs among the members. Although there is a difference between the unloading load in the direction of burrs and the unloading load in the opposite direction for each member, according to the above configuration, the direction of the burrs are different among the members in the cylindrical core part, The direction of burrs is not aligned in one direction. Therefore, the removal load from the fixing member as the entire cylindrical core portion is less dependent on the removal direction, and the fixing member is compared to the conventional case where the fitting shiro is set in accordance with the one where the removal load is low. It is possible to sufficiently secure a pull-out load when the core portion drops from the fixing member while suppressing a large amount of fitting white between the core portion and the core portion.

  Further, in the rotating electrical machine core, when the cylindrical core portion is composed of a plurality of divided cores, the plurality of thin plates are arranged so that the direction of the burr is directed in one direction along the axial direction of the cylindrical shape of the core fixing member. The one-way laminated core and the other-directional laminated core are arranged so as to face each other. It arrange | positions in a direction and is fixed to a core fixing member. Thereby, the dependence of the removal load from the fixing member as the entire cylindrical core portion on the removal direction is alleviated. Therefore, compared with the conventional case where the fitting shiro is set in accordance with the lower unloading load, the fixing member and the core portion are prevented from taking a large amount of fitting white between the fixing member and the core portion. Sufficient load can be secured when falling off.

  Further, in the rotating electrical machine core, when the cylindrical core portion is composed of a plurality of core thin plates having the same outer peripheral shape as the outer peripheral shape thereof, the direction of the burr is along the axial direction of the cylindrical shape of the core fixing member. Using a unidirectional burr thin plate facing in one direction and a unidirectional burr thin plate facing in the other direction, the difference between the number of laminated one direction burr thin plates and the number of laminated other direction burr thin plates is within a predetermined range. It is assumed that there is a number difference. Although there is a difference between the unloading load in the direction of burrs and the unloading load in the opposite direction for each core sheet, according to the above configuration, the cylindrical core part is a laminate of the unidirectional burrs sheet and the other-direction burrs sheet. Since the number difference is within a predetermined range, the dependency of the removal load from the fixing member as the entire cylindrical core portion on the removal direction is alleviated. For example, if the difference in the number of layers between the one-direction burr thin plate and the other-direction burr thin plate is set to zero, it is possible to eliminate the dependency of the drop load depending on the drop direction. In this way, it is possible to prevent the fixing member from taking a large amount of fitting white between the fixing member and the core portion as compared with the conventional case where the fitting white is set in accordance with the lower unloading load. Sufficient load can be secured when the core part falls off.

  The rotating electrical machine core is provided at a cylindrical core fixing member, a cylindrical core portion that is fitted and fixed to the core fixing member, and an axial end of the core fixing member. And a retaining portion for preventing the mold core portion from coming off in the axial direction. And even if it is laminated and arranged so that the direction of the burr is directed in one direction along the axial direction of the cylindrical shape of the core fixing member, the core thin plate at the one end of the laminated layer has the direction of the burr It is made to face the direction of the other side edge part of the axial direction of a core fixing member. When the burrs are stacked and arranged so that the direction of the burrs is directed in one direction along the axial direction of the cylindrical shape of the core fixing member, the removal load in the removal direction opposite to the one direction is reduced. According to the above configuration, the retaining portion is provided at the one end side end opposite to the other end side end in the direction in which the burr is directed. In other words, the retaining portion is provided in the direction of removal in which the removal load is reduced. Therefore, compared with the conventional case where the fitting shiro is set in accordance with the lower unloading load, the fixing member and the core portion are prevented from taking a large amount of fitting white between the fixing member and the core portion. Sufficient load can be secured when falling off.

  The configuration using the retaining portion is applied when the cylindrical core portion is configured by a plurality of core thin plates having the same outer peripheral shape as the outer peripheral shape, and the cylindrical core portion is a plurality of divided cores. It can also be applied when configured.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a cylindrical shape is described as a cylindrical shape, but it may be other than a cylindrical shape, for example, a polygonal cylindrical shape. Moreover, although an electromagnetic steel plate is demonstrated below as a material of a core thin plate, it is good also as what is comprised with the thin plate material of other appropriate magnetic materials. Further, the number of stacked layers and the number of divided cores illustrated below are examples for explanation, and may be the number of stacked layers and the number of divided portions other than the illustrated numbers.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating a configuration of a stator core 10 as a core for a rotating electrical machine. The stator core 10 includes a cylindrical core fixing member 12 called an outer peripheral ring and a cylindrical core portion 14 having a circular outer peripheral shape that is fitted and fixed thereto. In FIG. 1, (a) on the left side shows an entire configuration of the stator core 10 in an exploded view, and (b) on the right side shows a schematic cross-sectional view. In FIG. 1B, the inner peripheral shape of the cylindrical core portion 14 is omitted.

  As will be described later, the core fixing member 12 is a cylindrical member having a function of holding a cylindrical core portion 14 configured by laminating a plurality of electromagnetic steel plates. A flange is provided at one end of the cylindrical shape. For example, an attachment portion of the stator core 10 can be provided on the flange.

  The core fixing member 12 may be formed by molding a metal material having an appropriate strength. The thickness of the core fixing member 12 can be appropriately set in consideration of the tensile stress along the circumferential direction when the cylindrical core portion 14 is fixed by press fitting or the like.

  The cylindrical core portion 14 has a circular outer peripheral shape, and the inner peripheral shape has an uneven shape in which a plurality of protrusions set according to the specifications of the stator are arranged in the circumferential direction. The plurality of protrusions are called teeth, and a coil (not shown) is wound around the protrusions. In the example of FIG. 1A, 18 protrusions are provided. Thus, the cylindrical core portion 14 has a complicated inner peripheral shape for coil winding, and has a predetermined thickness in the axial direction in order to obtain a predetermined output as a rotating electrical machine. is doing. The cylindrical core portion 14 can be formed as a single piece, or, as will be described in detail below, a plurality of sheets of electromagnetic steel sheets punched out in a predetermined shape so as to have a predetermined thickness. Laminated layers can be used. For punching, press working can be used.

  The cylindrical core portion 14 is configured by laminating a plurality of electromagnetic steel plates as core thin plates as described above, and the laminating method is as follows. That is, the cylindrical core portion 14 is a unidirectional burr thin plate in which the direction of the burrs 24 and 26 generated when forming the outer peripheral shape is one direction along the axial direction of the cylindrical shape of the core fixing member 12 as an electromagnetic steel plate. 20 and an other-direction burr thin plate 22 facing in the other direction. The difference between the number of laminated unidirectional burr thin plates 20 and the number of laminated unidirectional burr thin plates 22 is the difference in the number of laminated layers within a predetermined range.

  In the example of FIG. 1B, one direction along the axial direction of the cylindrical shape of the core fixing member 12 is a direction from the lower side to the upper side on the paper surface of FIG. This one direction is indicated by a solid arrow with the A direction. Note that the other direction, which is the opposite direction to the one direction, is indicated by a broken-line arrow as the B direction.

  The unidirectional burr thin plate 20 is a core thin plate on which the burr 24 is laminated in the A direction. On the other hand, the other-direction burr thin plate 22 is a core thin plate in which the burr 26 is laminated so as to face the B direction which is opposite to the A direction. In the stator core 10 shown in FIG. 1, the cylindrical core portion 14 has four unidirectional burr thin plates 20 stacked and four other directional burr thin plates 22 stacked, and the difference in the number of stacked layers is zero, that is, the same number of stacked layers. It is as.

  The operation of the above configuration will be described with reference to FIGS. FIG. 2 is a diagram for explaining a conventional laminating method, and FIG. 3 is a diagram for explaining the dependence of the unloading load on the direction of removal. FIG. 4 is a diagram illustrating the stacking method described in FIG. 1, and FIG. 5 is a diagram illustrating how the unloading direction dependency of the unloading load is improved.

  In the conventional lamination method of FIG. 2, the unidirectional burr thin plate 20 is laminated in the core fixing member 12 with the direction of the burr 24 aligned in the A direction. According to this method, the cylindrical core portion 15 can be easily formed by punching a thin plate of the same shape from an electromagnetic steel plate and sequentially stacking the same without turning the front and back.

  In FIG. 3, the horizontal axis indicates the disconnection direction, the vertical axis indicates the disconnection load, the disconnection load when the cylindrical core portion 15 is disconnected in the A direction, and the disconnection when the cylindrical core portion 15 is disconnected in the B direction. It is the figure which compared the load. When the removal direction is fixed, the removal load varies depending on the direction of the burr of the portion fitted to the core fixing member 12. In the example of FIG. 3, the unloading load fa when the unidirectional burr thin plate 20 is pulled out in the direction in which the burr 24 is present, that is, in the A direction in which the material protrudes, is unidirectional in the B direction in which the sag 25 is the back side of the burr 24. It is larger than the removal load fb when the burr thin plate 20 comes off.

  In the example of FIG. 3, when eight unidirectional burr thin plates 20 are laminated, the unloading load when the unplugging direction is the A direction is 8fa, and the unloading load when the unplugging direction is the B direction is 8fb. Since fa is larger than fb, the difference ΔF in the removal load due to the difference in the removal direction is 8 (fa−fb).

  FIG. 4 shows the cylindrical core portion 14 having the laminated structure described with reference to FIG. 1, in which four unidirectional burr thin plates 20 each having a burr 24 facing the A direction are stacked, and another burr thin plate 22 having a burr 26 facing the B direction. Are stacked. The removal load at this time is 4 (fa + fb) regardless of whether the removal direction is the A direction or the B direction. This is shown in FIG. The contents of the horizontal and vertical axes in FIG. 5 are the same as those in FIG. As shown in FIG. 5, the difference in the removal load due to the removal direction which is ΔF in FIG. 3 is zero.

  Compared to FIG. 3, the dropout load in the A direction is reduced from 8fa to 4 (fa + fb). The amount of decrease is 4 (fa−fb). On the other hand, the slipping load in the B direction increases from 8 fb to 4 (fa + fb). The amount of increase is 4 (fa-fb). Here, (fa−fb) is the difference in the removal load due to the difference in the removal direction for one unidirectional burr thin plate 20. From this, when the one-direction burr thin plate 20 and the other-direction burr thin plate 22 have the same number of layers, the difference in the unloading load caused by the difference in the unplugging direction can be reduced to zero. When there are many unidirectional burr thin plates 20 or many other direction burr thin plates 22, the difference in the unloading load due to the unloading direction will occur by (fa−fb).

  If the removal load differs depending on the removal direction, the cylindrical core portion 14 drops from the core fixing member 12 in the direction in which the removal load is small due to impact or the like. Therefore, it is necessary to reduce the fitting size between the core fixing member 12 and the cylindrical core portion 14 so as to increase the one having a smaller unloading load to an allowable value. However, if the fitting size is reduced, the compressive stress in the cylindrical core portion 14 is increased, and the magnetic characteristics of the stator core 10 are reduced. Therefore, the fitting size is preferably within a certain range.

In FIG. 4, in general, when the number of laminated unidirectional burr thin plates 20 is n ₁ and the number of laminated unidirectional burr thin plates 22 is n ₂ , the unloading load in the A direction is n ₁ fa + n ₂ fb. Yes, the unloading load in the B direction is n ₂ fa + n ₁ fb, and the difference in unloading load, which is the difference between them, is the product of (n ₁ −n ₂ ) and (fa−fb), which is the difference in the number of layers. It becomes. Therefore, using these relationships, it is possible to obtain a condition for making the drop load equal to or more than a predetermined value within the allowable range of the fitting white set from the viewpoint of the magnetic characteristics and the like of the stator core 10.

For example, the unloading load when the unidirectional burr thin plate 20 and the other direction burr thin plate 22 have the same number of stacked layers is (fa + fb) × (n ₁ + n ₂ ) / 2 regardless of the pulling direction. When this value has a margin of ΔN × (fa−fb) than the allowable value of the unloading load, the difference between the number of laminated one-direction burr thin plates 20 and the number of laminated other-direction burr thin plates 22 is ΔN or less. By doing so, the drop load can be made larger than the allowable value. Thus, the core fixing member 12 and the cylindrical core portion 14 are configured such that the difference between the number of layers of the unidirectional burr thin plates 20 and the number of layers of the other-direction burr thin plates 22 is within a predetermined range. The removal load when the cylindrical core portion 14 drops off from the core fixing member 12 can be set to a sufficiently large value while suppressing a large amount of fitting shim between the core fixing member 12 and the core fixing member 12.

  In the above, the burr 24 of the unidirectional burr thin plate 20 is directed in the A direction, the burr 26 of the burr thin plate 22 in the other direction is directed in the B direction, and further, the A direction side in the cylindrical core portion 14, that is, in FIGS. It has been described that the unidirectional burr thin plates 20 are gathered and laminated sequentially on the upper side of the paper, and the other-direction burr thin plates 22 are gathered and sequentially laminated on the B direction side, that is, the lower side of the paper of FIGS. In order to reduce the difference in the unloading load caused by the unwinding direction, the difference in the number of layers of the one-direction burr thin plate 20 and the number of layers of the other-direction burr thin plate 22 may be decreased. Is possible.

6, the sag 25 of the unidirectional burr thin plate 20 is directed in the B direction, the sag 27 of the other direction burr thin plate 22 is directed in the A direction, and further, the other direction burr is formed in the A direction side in the cylindrical core portion 14. The thin plates 22 are collected and sequentially stacked, and the unidirectional burr thin plates 20 are collected and sequentially stacked on the B direction side. According to this configuration, burrs do not appear on both end surfaces of the cylindrical core portion 14 in the axial direction. Even in the case of this configuration, the stacking number n ₂ of the stacking number n ₁ and the other direction burr sheet 22 of the one-way burr sheet 20 by appropriately setting, keep the difference extraction load depends on the opening direction in a predetermined range be able to.

  In the stacking method of FIG. 7, a single unidirectional burr thin plate 20 and a single other directional burr thin plate 22 are paired with their burr-facing surfaces facing each other, and a plurality of sets are stacked. According to this configuration, the difference in the unloading load depending on the pulling direction is set to zero, and no burr appears on both end surfaces of the cylindrical core portion 14 in the axial direction.

  In the above, the one-direction burr thin plate 20 and the other-direction burr thin plate 22 are combined and laminated. In this laminating method, it is necessary to perform laminating while reversing the front and back of a thin plate punched from an electromagnetic steel sheet. FIG. 8 shows a laminating method that does not reverse the front and back of a thin plate punched out from an electromagnetic steel sheet, that is, a conventional laminating method is used to increase the unloading load in the B direction, in which the unloading load is low in the prior art. A possible configuration is shown.

  In the configuration of FIG. 8, the cylindrical core portion 15 is laminated using only the unidirectional burr thin plate 20 in which the burr 24 faces the A direction. In this configuration, as described with reference to FIGS. 2 and 3, the missing load in the B direction is smaller than the missing load in the A direction. Therefore, in the configuration of FIG. 8, a retaining portion 30 that prevents the cylindrical core portion 15 from coming off in the axial direction is provided on one end face in the axial direction of the core fixing member 12. In the example of FIG. 8, the end surface in the B direction of the core fixing member 12 is the one side end surface.

  The retaining portion 30 is an annular member and is fixed to the core fixing member 12 at the outer peripheral portion thereof. As a fixing method, welding or the like can be used. It is sufficient that the retaining portion 30 is provided only on the end surface in the removal direction with the smaller removal load of the cylindrical core portion 15, and does not need to be provided on the end surface in the removal direction with the larger removal load. In the example of FIG. 8, the cylindrical core portion 15 is a free end that is press-fitted or shrinked on the end surface in the A direction of the core fixing member 12.

  In the unidirectional burr thin plate 20 in contact with the retaining portion 30, the burr 24 faces the A direction, that is, the other end surface of the core fixing member 12. Therefore, the sag side surface of the unidirectional burr thin plate 20 is in contact with the retaining portion 30.

  FIG. 9 is a diagram for explaining the state of the loose load in the configuration of FIG. The contents of the horizontal and vertical axes in FIG. 9 are the same as those in FIGS. As shown in FIG. 9, in the conventional technique, by providing the retaining portion 30 in the B direction where the unloading load is small, the unloading load can be made sufficiently large.

  In the above description, the outer peripheral shape of each thin plate obtained by punching out the electromagnetic steel sheet is described as being the same as the outer peripheral shape of the cylindrical core portion 14. That is, the cylindrical core part 14 is formed by laminating a plurality of sheets in the axial direction while aligning the outer peripheral shape of the thin plate obtained by punching the electromagnetic steel sheet. In addition, there is a method using a split core as a method of forming the cylindrical core portion. The divided core is a core obtained by dividing the cylindrical core portion by a predetermined number along the circumferential direction of the cylindrical shape. For example, one cylindrical core part is divided into 18 in the circumferential direction to form 18 divided cores, which are aligned with each other and fitted into the core fixing member 12 to form a cylindrical core part as a whole. .

  The split core can also be formed by laminating thin plates having partial shapes divided by a predetermined number along the circumferential direction of the cylindrical shape of the cylindrical core portion. Here, since the thin plate having a partial shape can be obtained by punching out an electromagnetic steel plate, the laminating method shown in FIGS. 1, 4, 6, and 7 can be used. Further, the retaining portion 30 described with reference to FIGS. 8 and 9 can be used.

  Furthermore, in the case of a split core, the configuration shown in FIG. 10 can be used. FIG. 10 is a diagram illustrating a state of the stator core 40 using the split core. The stator core 40 includes a core fixing member 12 and a cylindrical core portion 42 composed of a plurality of divided cores. In the example of FIG. 10, the cylindrical core portion 42 is composed of 18 divided cores corresponding to the 18 protruding portions.

  Here, each of the 18 divided cores is divided into two types of divided cores. The first type of split core is a one-way stacked split core 44 in which thin plates having burrs facing the A direction shown in FIG. 10 are stacked. Another type of split core is an other-direction stacked split core 46 in which thin plates having burrs facing the B direction shown in FIG. 10 are stacked. The one-way laminated core 44 and the other-direction laminated core 46 are arranged in the circumferential direction and are fitted to the core fixing member 12 so as to form one cylindrical core portion 42 in an arrangement relationship adjacent to each other. To do.

  In FIG. 10, the direction of the burr of each divided core is indicated by an arrow. That is, along the circumferential direction, the one-way laminated core 44 is arranged next to the other-direction laminated core 46, and the one-direction laminated core 46 is arranged next to the other-directional laminated core 46. When the number of split cores is an even number, the number of one-way laminated cores 44 and the number of other-direction laminated cores 46 are the same. When the number of split cores is an odd number, the number of one-way stacked split cores 44 or other-direction stacked split cores 46 is increased by one.

  FIG. 11 is a diagram for explaining the state of the unloading load as an operation of the configuration of FIG. The contents of the horizontal and vertical axes in FIG. 11 are the same as those in FIGS. 3, 5, and 9. Here, as a conventional technique, the broken load when the cylindrical core portion 42 is configured by only the unidirectional laminated core 44 is indicated by a broken line for reference. As shown in FIG. 11, by making the number of one-way laminated cores 44 and the other-direction laminated cores 46 equal, the difference in the unloading load depending on the unloading direction becomes zero, and the unloading load is small in the conventional technology. In the direction B, it is shown that the drop load increases.

  In the above description, the number of the one-way laminated cores 44 and the other-direction laminated cores 46 are the same. However, as described with reference to FIG. It can be determined by the difference between the number of laminated cores 44 and the number of other-direction laminated cores 46. Therefore, it is possible to improve the desired removal load by keeping the difference between the number of one-way laminated cores 44 and the number of other-direction laminated cores 46 within a predetermined range of the number of divided cores. It is.

  Thus, when the cylindrical core fixing member 12 and the cylindrical core portion that is fitted and fixed to the core fixing member 12 are provided, the core fixing members of a plurality of members that constitute the cylindrical core portion. By making the direction of the burr of the part that fits different between the members, the difference in the unloading load that depends on the unloading direction can be reduced, and even in the unloading direction, which is a low unloading load in the prior art, the unloading load Can be improved. Further, when aligning the burr directions in the same direction, by providing a retaining portion, it is possible to improve the removal load even in the removal direction, which is a low removal load in the prior art.

It is a figure explaining the structure of the stator core for rotary electric machines in embodiment which concerns on this invention. It is a figure explaining the lamination | stacking method in the stator core conventionally performed. FIG. 3 is a diagram for explaining the dependence of the unloading load on the unloading direction according to the method of FIG. 2. It is a figure which shows the lamination | stacking method demonstrated in FIG. It is a figure which shows the mode of the improvement of the detachment direction dependence of the detachment load in embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a figure which shows the example of the other lamination | stacking method. In embodiment which concerns on this invention, it is a figure which shows the example of another lamination method. In embodiment which concerns on this invention, it is a figure which shows a mode that a retaining part is provided. It is a figure explaining the mode of the unloading load in the composition of FIG. In embodiment which concerns on this invention, it is a figure explaining the mode of the stator core using a split core. It is a figure explaining the mode of the unloading load in the composition of FIG.

Explanation of symbols

  10, 40 Stator core, 12 Core fixing member, 14, 15, 42 Cylindrical core part, 20 One-direction burr thin plate, 22 Other direction burr thin plate, 24, 26 Burr, 25, 27 Sag, 30 Retaining part, 42 Cylindrical type Core part, 44 One-way laminated division core, 46 Other-direction laminated division core.

Claims (4)

A tubular core fixing member,
A cylindrical core portion having an outer dimension corresponding to the inner dimension of the cylindrical shape of the core fixing member, and fitted and fixed to the core fixing member;
With
The cylindrical core is
A rotating electrical machine core characterized in that it is composed of a plurality of members, and the direction of the burr of the portion that fits into the core fixing member of each member differs between the members. The core for a rotating electrical machine according to claim 1,
The cylindrical core is
As a plurality of members, it is composed of a plurality of divided cores formed by laminating thin plates having partial shapes divided in a predetermined number along the circumferential direction of the cylindrical shape,
Multiple split cores
A one-way laminated core in which a plurality of thin plates are laminated so that the direction of burrs generated when forming the outer shape of the partial shape faces one direction along the axial direction of the cylindrical shape of the core fixing member, and the other direction Including a multi-directional laminated core arranged to face
The core for a rotating electrical machine, wherein the one-way laminated core and the other-direction laminated core are arranged in the circumferential direction in an arrangement relationship adjacent to each other and fixed to the core fixing member. The core for a rotating electrical machine according to claim 1,
The cylindrical core is
As a plurality of members, it is composed of a plurality of core thin plates that have the same outer peripheral shape as the outer peripheral shape of the cylindrical core part and are laminated in the axial direction,
Multiple core sheets
The direction of the burr generated when forming the outer peripheral shape includes a one-direction burr thin plate that faces one direction along the axial direction of the cylindrical shape of the core fixing member, and a second burr thin plate that faces the other direction,
A core for a rotating electrical machine, wherein the difference between the number of laminated unidirectional burr thin plates and the number of laminated unidirectional burr thin plates is a difference in the number of laminated layers within a predetermined range. A tubular core fixing member,
A cylindrical core portion having an outer dimension corresponding to the inner dimension of the cylindrical shape of the core fixing member, and fitted and fixed to the core fixing member;
A retaining portion that is provided at one end portion in the axial direction of the core fixing member and prevents the cylindrical core portion from coming off in the axial direction;
With
The cylindrical core is
Including a plurality of core thin plates arranged so that the direction of the burr generated when forming the outer shape is oriented in one direction along the axial direction of the cylindrical shape of the core fixing member,
A core for a rotating electrical machine, wherein the laminated core thin plate at one end is directed toward the other end in the axial direction of the core fixing member.

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