JP2010011621A - End plate for rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress loss and heat generation caused by eddy current in an end plate for rotating electrical machine, and to cool a rotor. <P>SOLUTION: A rotating electrical machine 10 includes a case 12, a rotor shaft 14, a stator core 16 and a coil 18, a rotor core 20 and a magnet 22, and an end plate 30. The end plate 30 includes an end plate body 32, an arm 34 which extends in the radial direction from the end plate body 32 apart from the rotor core 20, and a presser 36 provided at the distal end of the arm 34 and in contact with the rotor core 20. A refrigerant supply path 60 is provided in the rotor shaft 14 and connected with a refrigerant supply path 62 on the end plate side which is arranged in the end plate 30, and refrigerant is supplied to a gap space 50 formed between the end plate 30 and the rotor core 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an end plate for a rotating electrical machine, and more particularly to an end plate that presses an end of a cylindrical core having a plurality of magnets arranged along a circumferential direction in an axial direction.

  As a permanent magnet type rotor for a rotating electrical machine, a rotor in which magnets are embedded in a laminated core for high efficiency and downsizing is used. In this case, a holding member for pressing the core thin plates and the permanent magnets laminated in the axial direction so as not to jump out is used. Since this holding member is provided at the end of the rotor in the axial direction, it is called an end ring, a flange, an end plate or the like.

  For example, in Patent Document 1, in a rotor called an end ring or a flange that holds a permanent magnet in a rotor of an electric motor including a permanent magnet, a portion that contacts the permanent magnet is formed of a non-magnetic material and contacts the permanent magnet. It is disclosed that the portion not to be formed is made of a magnetic material.

  Further, in Patent Document 2, as a permanent magnet motor in which a permanent magnet is disposed in a rotor, a configuration including a rotor core into which a permanent magnet is inserted and an end plate provided at an end portion in the rotation axis direction of the rotor core. The region where the end plate faces the permanent magnet and the region radially outward from the region are made of a nonmagnetic material to form a d-axis magnetic path by the magnetic flux from the stator, and the other part faces the core body. It is disclosed that a region to be formed is a region that forms a q-axis magnetic path by a magnetic flux from a stator. It is stated that the configuration of the end plate can improve both the magnet torque and the reluctance torque.

  Further, in Patent Document 3, the rotor of an electric motor having a magnet disposed in a laminated core was examined, and in the end plate used for the rotor, there was a range from the inner surface of the magnet to the outer peripheral side of the laminated core. It is stated that the knowledge that eddy current loss is most likely to occur is obtained. Therefore, a configuration in which the end plate is notched in the range where the eddy current is most likely to be generated and a configuration in which the range is a non-magnetic material are disclosed.

JP 2002-345186 A JP-A-2005-102461 JP 2005-304177 A

  As described above, an end plate is used in a rotor using a laminated iron core in which magnets are embedded. However, when an eddy current is generated in the end plate, a loss occurs in the end plate, heat is generated, and a temperature rise occurs. In addition to this, when the temperature of the rotor rises due to driving or the like, the coercive force is lowered due to the temperature characteristics of the magnet, and the magnet undergoes irreversible demagnetization due to the demagnetizing field from the outside, thereby reducing the performance of the rotating electrical machine. Arise.

  The objective of this invention is providing the end plate for rotary electric machines which makes it possible to cool a rotor. Another object is to provide an end plate for a rotating electrical machine capable of suppressing loss and heat generation due to eddy current.

  An end plate for a rotating electrical machine according to the present invention is an end plate that axially presses the end of a cylindrical core having a plurality of magnets arranged along a circumferential direction, and is arranged in a radial direction from the end plate main body. A separation extending portion that is arranged in an axial direction apart from the core and made of a non-magnetic material, and is provided at a radial tip of the separation extending portion so as to abut against the core; And a presser portion made of a non-magnetic material of a different material.

  Moreover, in the end plate for a rotating electrical machine according to the present invention, it is preferable that the separation extending portion is made of aluminum and the pressing portion is made of ceramic or resin.

  Further, in the end plate for a rotating electrical machine according to the present invention, the separation extending portion extends radially in the shape of an arm so as to pass between adjacent magnets arranged along the circumferential direction of the cylindrical core. Preferably, the arm portions are arranged in a plurality of positions, and are filled with the adjacent arm portions being spaced apart from the core in the axial direction, and having an inter-arm filling portion made of a nonmagnetic material.

  Moreover, in the end plate for a rotating electrical machine according to the present invention, it is preferable that the filling portion between the arms is made of aluminum, resin, or ceramic.

  Also, in the end plate for a rotating electrical machine according to the present invention, the medium supply for supplying a cooling medium to the space formed by the end of the cylindrical core, the arm, the inter-arm filling portion, and the presser It is preferable to provide a path.

  With the above configuration, the end plate for the rotating electrical machine extends from the end plate main body in the radial direction, and is spaced apart from the core in the axial direction. A pressing portion is provided at the distal end portion in the radial direction, is in contact with the core, and is made of a nonmagnetic material made of a different material from the separated extension portion. As a result, only the presser portion, which is a non-magnetic material at the tip of the spaced extension extending from the end plate body, contacts the core. The spaced extension does not contact the core. Therefore, generation | occurrence | production of the eddy current in an end plate can be suppressed.

  Moreover, in the end plate for a rotating electrical machine, the separation extending portion is made of aluminum, and the presser portion is made of ceramic or resin. Although aluminum is a conductor, generation of eddy currents in the separated extension portion can be suppressed by taking a sufficient distance from the core. Moreover, since ceramic and resin are insulators, generation of eddy currents in the presser portion can be eliminated.

  Further, in the end plate for a rotating electrical machine, a plurality of spaced extension portions are radially extended in an arm shape so as to pass between adjacent magnets arranged along the circumferential direction of the cylindrical core. Since the arm portion is used, the influence of the magnet on the separated extension portion can be reduced. In addition, the space between the adjacent arm portions is filled while being spaced apart from the core in the axial direction, and since there is a filling portion between the arm portions made of a non-magnetic material, Strength can be secured.

  Moreover, in the end plate for rotating electrical machines, since the filling portion between the arms is made of aluminum, resin, or ceramic, a material common to the arms and the pressing portion can be used, and the cost can be reduced.

  The rotating electric machine end plate further includes a medium supply path for supplying a cooling medium to a space formed by the end portion of the cylindrical core, the arm portion, the inter-arm portion filling portion, and the presser portion. As a result, the core having the magnet can be cooled, and the performance degradation of the rotating electrical machine due to the temperature characteristics of the magnet can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Below, a core is demonstrated as what laminated | stacked the core thin plate which processed the electromagnetic steel plate into the predetermined shape, However, The core of a structure of other than this may be sufficient. For example, a core having a structure in which magnetic bodies are integrally processed, or a core having a single structure by compacting or the like may be used. In addition, the magnet is described as a configuration using a plurality of magnets in which a pair of magnets are arranged in a V shape, but other configurations may be used. Moreover, since the material etc. which are demonstrated below are an example for description, it can be suitably changed according to the specification etc. of a rotary electric machine.

  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 cross-sectional view illustrating a configuration of a rotating electrical machine 10 including an end plate 30 having a cooling function. The rotating electrical machine 10 includes a case 12, a rotor shaft 14 supported at both ends by the case 12, a stator core 16 attached to the case 12, a coil 18 wound around the stator core 16, and a rotor core 20 attached to the rotor shaft 14. The magnet 22 is configured to be embedded in the rotor core 20 and an end plate 30 for pressing the rotor core 20 and the magnet 22 so as not to protrude in the axial direction.

  The case 12 is a casing of a rotating electrical machine, and for example, a case obtained by processing an appropriate metal casting can be used. The rotor shaft 14 corresponds to the output shaft of the rotating electrical machine 10, and a machined metal shaft having an appropriate strength such as stainless steel can be used. The stator core 16 is a magnetic body in which projecting portions called teeth for winding a coil are arranged in the circumferential direction facing the rotor core 20, and a laminate obtained by punching electromagnetic steel sheets into a predetermined shape and using them is used. it can. The coil 18 is for flowing a current for generating a driving force in cooperation with the magnet 22, and can be configured by winding a conductor wire that has been subjected to an insulation treatment around the teeth of the stator core 16. The coil 18 is connected to a rotating electrical machine control circuit (not shown).

  The rotor core 20 is a cylindrical magnetic body that is attached to the rotor shaft 14. The rotor core 20 is provided with a hole through which the rotor shaft 14 passes and a hole for embedding the magnet 22. The rotor core 20 can be made by punching and laminating electromagnetic steel sheets into a predetermined shape.

  The magnet 22 is a permanent magnet that generates a magnetic flux for generating a driving force in cooperation with a driving current passed through a coil wound around the stator core 16. A plurality of magnets 22 are arranged in the rotor core 20 so as to extend in the axial direction. The arrangement of the magnets 22 will be described later in the description of the structure for holding the end plate 30. As the magnet 22, a rare earth magnet such as a neodymium magnet can be used.

  The end plate 30 includes an end plate main body 32, an arm portion 34 that extends in the radial direction from the end plate main body 32, and a pressing portion 36 that is provided at a distal end portion in the radial direction of the arm portion 34 and that contacts the rotor core 20. It is comprised and arrange | positions facing the axial direction end surface of the rotor core 20. As shown in FIG. The end plates 30 are respectively arranged on both end surfaces in the axial direction with respect to the rotor core 20. However, since the end plates 30 have the same structure, the end plate 30 is arranged on the left side of the rotor core 20 on the paper surface of FIG. The plate 30 will be described. In addition, a presser ring 52 for fixing and supporting the end plate 30 is attached to the rotor shaft 14.

  Inside the rotor shaft 14, a refrigerant supply path 60 is provided through which a refrigerant for cooling the rotor core 20 and the magnet 22 flows. The refrigerant supply path 60 extends in the axial direction of the rotor shaft 14, extends radially inside the rotor shaft 14 at a position where the end plate 30 is disposed, and is an end plate-side refrigerant supply path, which will be described later, disposed on the end plate 30. The refrigerant is supplied to the gap space 50 connected to the end plate 30 and formed between the end plate 30 and the rotor core 20.

  FIG. 2 is a diagram for explaining the detailed configuration of the end plate 30, in which (a) on the left side is a front view as viewed from the left side, (b) in the center is a cross-sectional view, and (c) on the right side is from the right side. Each back view is shown. The end plate 30 is an annular composite member having a circular outer peripheral shape and having a center hole through which the rotor shaft 14 passes.

  The end plate main body 32 is an annular member that is attached to the rotor shaft 14 and has a function of pressing the inner peripheral side portion of the rotor core 20 at its end face. The center hole of the annular member is a through hole through which the rotor shaft 14 passes, and the outer peripheral portion of the annular member functions as an attachment portion to which the arm portion 34 is attached. Further, an end plate side refrigerant supply path 62 connected to a refrigerant supply path 60 provided inside the rotor shaft 14 is provided inside the annular member. The end plate body 32 can be obtained by processing a nonmagnetic material into a predetermined shape. As the nonmagnetic material, a nonmagnetic metal such as aluminum, or an insulator such as resin can be used.

  The end plate side refrigerant supply path 62 is a flow path that is provided inside the end plate main body 32, extends in the radial direction from the center hole thereof, and opens to the annular outer periphery of the end plate main body 32. In the example of FIG. 2C, a state is shown in which four end plate side refrigerant supply paths 62 extend in the radial direction every 90 degrees at an angle along the circumferential direction from the center hole of the end plate main body 32. ing. The end plate side refrigerant supply path 62 opens toward the gap space 50 shown in FIG. Details of the formation of the gap space 50 will be described later.

  The arm portion 34 is an arm-shaped member that extends in the radial direction from the end plate main body 32 and is spaced apart from the rotor core 20 in the axial direction. In the example of FIG. 2 (c), it is shown that eight arm portions 34 extend in the radial direction every 45 degrees at an angle along the circumferential direction in the annular outer peripheral portion of the end plate body 32. Has been. Such an arm portion 34 can be obtained by processing a nonmagnetic material into a predetermined shape. As the nonmagnetic material, a nonmagnetic metal such as aluminum, or an insulator such as resin can be used. The end plate main body 32 and the arm part 34 can also be comprised with the nonmagnetic body of the same material, and in that case, the end plate main body 32 and the some arm part 34 can be comprised as an integral structure.

  The pressing portion 36 is a member that is provided at each of the distal end portions in the radial direction of the plurality of arm portions 34 and contacts the rotor core 20. As described above, since the plurality of arm portions 34 do not come into contact with the rotor core 20, aluminum which is a nonmagnetic metal may be used. However, since the presser portion 36 comes into direct contact with the rotor core 20, It is preferable to use a non-magnetic material made of a material different from that of the portion 34. Desirably, the pressing portion 36 may be formed of an insulator such as ceramic or resin. By doing so, it is possible to eliminate generation of eddy current in the presser portion 36.

  The inter-arm portion filling portion 38 provided between the plurality of arm portions 34 each having the pressing portion 36 at the distal end portion has a function for making the entire end plate 30 into one annular member. The inter-arm portion filling portion 38 includes an inner diameter side filling portion 40 that fills a space between the plurality of arm portions 34 and an outer diameter side filling portion 42 that fills a space between the plurality of pressing portions 36. The inner diameter side filling portion 40 is provided apart from the rotor core 20, similarly to the arm portion 34. That is, the inner diameter side filling portion 40 does not contact the rotor core 20. The outer diameter side filling portion 42 abuts on the rotor core 20 in the same manner as the presser portion 36. As shown in FIG. 2A, the arm portion 34 is not shown in the front view seen from the left side of the end plate 30. That is, the inter-arm filling portion 38 not only fills the space between the arm portions 34 but also covers the upper portion of the arm portion.

  The inter-arm filling portion 38 is made of a nonmagnetic material. As the nonmagnetic material, a nonmagnetic metal such as aluminum, or an insulator such as ceramic or resin can be used. Preferably, resin is used, and the end plate main body 32, the arm part 34, and the pressing part 36 are included, and the end plate 30 may be integrated by integral molding.

  When the end plate 30 configured as described above is attached to the rotor shaft 14, the end plate 30 includes an end surface of the holding portion 36, and an end surface of the end plate main body 32 in the same direction as the end surface of the holding portion 36 along the axial direction. Thus, it contacts the rotor core 20. Assuming that the abutting direction is one side along the axial direction of the end plate 30, the other side along the axial direction of the end plate 30 is covered with the inter-arm filling portion 38 as described above. Therefore, when the end plate 30 is attached to the rotor shaft 14 and abuts against the rotor core 20 by the pressing portion 36 and the one end surface of the end plate main body 32, the gap space 50 shown in FIG. 1 is formed.

  The gap space 50 is a space formed by the end portion of the cylindrical rotor core 20, the arm portion 34, the inter-arm portion filling portion 38, and the presser portion 36. The gap space 50 is an axial gap space for suppressing the generation of eddy current in the arm portion 34, and is also a refrigerant supply space in which the end plate side refrigerant supply passage 62 is opened and the rotor core 20 and the magnet 22 are cooled. is there.

  As described with reference to FIG. 1, the rotor shaft 14 is provided with the refrigerant supply path 60 therein. The refrigerant supply path 60 extends in the axial direction in the rotor shaft 14 and extends in the radial direction in the rotor shaft 14 at a position where the end plate 30 is disposed, and the end plate-side refrigerant provided in the end plate main body 32 there. Connected to the supply path 62. As described with reference to FIG. 2C, the end plate side refrigerant supply path 62 extends in the radial direction inside the end plate main body 32 and opens into the gap space 50. Here, when a refrigerant is caused to flow from the refrigerant supply source (not shown) to the refrigerant supply path 60 and the rotor shaft 14 rotates, the centrifugal force can cause the refrigerant to flow vigorously through the flow path extending in the radial direction.

  Thus, since the refrigerant can be supplied to the gap space 50 using the centrifugal force of the rotor shaft 14, a small refrigerant pump is sufficient, and in some cases, a special refrigerant pump is unnecessary. As the refrigerant, for example, cooling oil can be used. Although not shown in FIG. 1 and the like, the gap space 50 can be provided with an appropriate opening for discharging or circulating the refrigerant.

  FIG. 3 is a diagram for explaining the relationship among the end plate main body 32, the arm portion 34, and the presser portion 36. In FIG. 3, the inter-arm filling portion 38 is indicated by a broken line so that the relationship can be easily understood. As shown in FIG. 3, the arm portion 34 is thinner than the end plate body 32. The thickness including the presser portion 36 at the distal end portion of the arm portion 34 is set to be exactly the same as the thickness of the end plate main body 32. The inner diameter side filling portion 40 has the same thickness as the arm portion 34, and the outer diameter side filling portion 42 has the same thickness as the thickness including the presser portion 36 at the distal end portion of the arm portion 34.

  In this way, the shape of the outer peripheral side of the end plate 30 is formed by the portion including the presser portion 36 at the distal end portion of the arm portion 34 and the outer diameter side filling portion 42, and this outer peripheral side shape and the end plate main body are formed. A hollow space surrounded by 32 outer peripheral shapes corresponds to the gap space 50 described above.

  FIG. 4 is a diagram for explaining the relationship between the arrangement of the magnets 22 in the rotor core 20 and the arrangement of the arm portions 34 and the presser portions 36. FIG. 4 schematically shows the state of the periphery of the magnet 22 on the end face of the rotating electrical machine 10 of FIG. 1, and the illustration of the inter-arm filling portion 38 is omitted.

  A plurality of magnets 22 having the same polarity are arranged in a V shape as a set, and a plurality of sets are embedded in the rotor core 20. In the example of FIG. 4, a set of magnets 22 is shown just where the arm portion 34 is disposed. Each of the pair of magnets 22 is such that the N pole faces the outer peripheral side of the rotor core 20 and the S pole faces the inner peripheral side of the rotor core 20, and the two N poles are inclined with respect to each other. Are arranged in a V shape. The magnets 22 arranged outside the pair of magnets 22 each have an S pole facing the outer peripheral side of the rotor core 20 and an N pole facing the inner peripheral side of the rotor core 20. The polarity arrangement is opposite to that of the set of V-shaped arrangement magnets 22.

  As shown in FIG. 4, the arm portion 34 is disposed so as to extend in the radial direction so that a pair of magnets 22 having the same polarity with each other pass between them. The arm portion 34 is not disposed between the two magnets 22 having different polarities. The pressing portion 36 provided at the distal end portion of the arm portion 34 is arranged so as to hold the rotor core 20 at the intermediate portion where the pair of magnets 22 having the same polarity are arranged in a V shape.

  In this way, one arm portion 34 and the presser portion 36 are arranged for a pair of magnets 22 having the same polarity, and the arm portion 34 is also pressed between the two magnets 22 having different polarities. By not arranging 36, the amount of the non-magnetic material applied to the arm portion 34 and the holding portion 36 can be reduced. Since the center of the V-shaped arrangement, which is known to have a high stress load experimentally and empirically, is held by the holding portion 36, the holding function of the end plate 30 against the rotor core 20 without reducing the strength. Can be fulfilled sufficiently.

  In addition, since the rotor core 20 is pressed by the presser portion 36 made of an insulator, the rotor core 20 is not affected by a loop of eddy current generated between the adjacent magnets 22 in the rotor core 20, and the low-loss rotating electric machine The rotor heat generation due to the eddy current can be suppressed.

  FIG. 5 is a diagram for explaining the function of suppressing eddy current generation in the gap space 50. The magnetic flux from the magnet 22 is radiated toward the end plate 30 as indicated by the arrows in FIG. Here, there is a gap H between the magnet 22 and the arm portion 34 of the end plate 30 due to the gap space 50. Since the gap space 50 is air or a refrigerant that is cooling oil, the magnetic resistance is overwhelmingly greater than that of the electromagnetic steel sheet constituting the rotor core 20. Therefore, the magnetic flux from the magnet 22 flows on the very surface of the rotor core 20, and if there is a gap H to some extent, almost no magnetic flux that generates an eddy current in the arm portion 34 reaches. Although it depends on the performance of the magnet 22, it can be seen from experiments that the magnetic flux from the magnet 22 hardly affects the arm portion 34 when the gap H is about several millimeters. Therefore, by appropriately setting the gap interval H, loss due to eddy current can be sufficiently suppressed even when a non-magnetic metal such as aluminum is used for the arm portion 34.

  FIG. 6 is a diagram illustrating some examples of the connection structure between the arm portion and the presser portion. FIG. 6A shows the connection structure described with reference to FIGS. 1 to 5, and the presser part 36 is arranged on the tip part of the arm part 34 having a uniform thickness, and the arm part 34 and the presser part 36. It is fixed and fixed with adhesive etc. In FIG. 6B, the presser part 66 is disposed so as to be connected to the tip of the arm part 64, and the arm part 64 and the presser part 66 are fixed and attached by adhesion or the like. In FIG. 6C, a locking shape is provided at the tip of the arm portion 65, and a shape corresponding to this locking shape is provided in the presser portion 67, and the arm portion 65 and the presser portion are used together with locking and adhesion. 67 is fixedly attached. For example, by adopting a locking structure that prevents the presser portion 67 from moving to the outer peripheral side, the presser portion 67 is prevented from being separated from the arm portion 65 by centrifugal force even when the rotor shaft 14 rotates. Can do.

  As described above, the material of each element constituting the end plate 30 can be selected in consideration of strength and cost. Here, since there are the elements of the end plate main body 32, the arm part 34, the pressing part 36, and the inter-arm filling part 38, the degree of freedom in selecting the material can be increased. As described above, the most preferable is that the presser part 36 that contacts the rotor core 20 is a ceramic or resin insulator, the end plate body 32 and the arm part 34 that require strength are made of a non-magnetic metal such as aluminum, The inter-arm filling portion 38 is preferably made of a low-cost resin. Of course, in consideration of advantages such as an integrated structure, a combination of different material materials may be selected.

  FIG. 7 is a diagram illustrating an example of a rotor 70 including an end plate 80 having a simple configuration while having an eddy current suppressing function and a cooling function. The end plate 80 in FIG. 7 includes an annular end plate main body 82 made of aluminum as a material, and a presser portion 84 made of ceramic or resin attached to the outer periphery thereof.

It is sectional drawing explaining the structure of the rotary electric machine provided with the end plate of embodiment which concerns on this invention. It is a figure explaining the detailed structure of the end plate in embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a figure explaining the relationship between an end plate main body, an arm part, and a pressing part. In embodiment which concerns on this invention, it is a figure explaining the relationship between arrangement | positioning of the magnet in a rotor core, and arrangement | positioning of an arm part and a pressing part. In embodiment which concerns on this invention, it is a figure explaining the eddy current generation | occurrence | production suppression function of clearance gap space. In embodiment which concerns on this invention, it is a figure which shows some examples about the connection structure between an arm part and a pressing part. In embodiment which concerns on this invention, it is a figure which shows an example of a rotor provided with the end plate of another structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Case, 14 Rotor shaft, 16 Stator core, 18 Coil, 20 Rotor core, 22 Magnet, 30, 80 End plate, 32, 82 End plate main body, 34, 64, 65 Arm part, 36, 66, 67, 84 Holding part, 38 Filling part between arm parts, 40 Inner diameter side filling part, 42 Outer diameter side filling part, 50 Clearance space, 52 Presser ring, 60 Refrigerant supply path, 62 End plate side refrigerant supply path, 70 Rotor.

Claims (5)

An end plate that axially presses the end of a cylindrical core having a plurality of magnets arranged along the circumferential direction,
A radially extending portion extending from the end plate body in a radial direction, spaced apart from the core in the axial direction, and configured by a non-magnetic material;
A presser portion that is provided at a distal end portion in the radial direction of the separation extending portion and abuts against the core, and is made of a nonmagnetic material made of a different material from the separation extending portion;
An end plate for a rotating electrical machine comprising: The end plate for a rotating electrical machine according to claim 1,
The separation extending portion is made of aluminum,
An end plate for a rotating electrical machine, wherein the presser portion is made of ceramic or resin. The end plate for a rotating electrical machine according to claim 1,
The separation extension part is an arm part that extends in the radial direction in an arm shape so as to pass between magnets arranged adjacent to each other along the circumferential direction of the cylindrical core,
An end plate for a rotating electrical machine having a filling portion between arms which is formed of a nonmagnetic material and is filled between adjacent arms while being spaced apart from the core in the axial direction. In the end plate for rotating electrical machines according to claim 3,
An end plate for a rotating electrical machine, wherein the filling portion between the arms is made of aluminum, resin, or ceramic. In the end plate for rotating electrical machines according to claim 3,
An end plate for a rotating electrical machine comprising a medium supply path for supplying a cooling medium to a space formed by an end portion of a cylindrical core, an arm portion, an inter-arm portion filling portion, and a presser portion. .

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