JP5648438B2 - Rotor core, rotor for rotating electrical machine, and method for manufacturing rotor core for rotating electrical machine - Google Patents

Description

  The present invention relates to a rotor core, a rotor for a rotating electrical machine, and a method for manufacturing a rotor core for a rotating electrical machine, and in particular, a rotor core formed by laminating a large number of electromagnetic steel sheets, a rotor for a rotating electrical machine using the same, and a rotor core for a rotating electrical machine It relates to a manufacturing method.

Conventionally, for example, Japanese Patent Laid-Open No. 2008-154436 (hereinafter referred to as Patent Document 1) discloses a rotor core configured by laminating a plurality of electromagnetic steel plates in the axial direction, a permanent magnet embedded in the rotor core, and the center of the rotor core. A rotor is disclosed that includes a rotor shaft that is fixed through the rotor shaft and two end plates that press the rotor core from both sides in the axial direction to fix the axial position of the rotor core relative to the rotor shaft. In this rotor, the electromagnetic steel plates constituting the rotor core are connected and fixed to each other by caulking portions, and it is shown that the end plate is formed in an annular shape having the same outer dimensions as the rotor core.

  Further, for example, in Japanese Patent Application Laid-Open No. 2010-142038 (hereinafter referred to as Patent Document 2), a resin portion for fixing a permanent magnet and an annular resin portion having an end plate function bonded to the end surface of the rotor core are integrally formed. A rotor for a rotating electric machine is disclosed.

  Further, for example, in Japanese Patent Application Laid-Open No. 8-163834 (hereinafter referred to as Patent Document 3), a protrusion provided on the inner periphery of a shaft hole of a rotor core is bent and deformed by press-fitting of the rotation shaft, and the rotation shaft is inserted into the shaft hole. Is inserted, or the protrusion provided on the outer periphery of the stator core is externally fitted while the protrusion is bent and deformed by press-fitting a cylindrical frame. It is described that a synthetic resin may be injected into a slight gap formed therebetween and cured.

  Further, for example, in Japanese Patent Application Laid-Open No. 11-98735 (hereinafter referred to as Patent Document 4), referring to FIG. 5 and the related description, a concave portion is formed in the laminated portion of the electromagnetic steel sheets, and is first injected into the slot. The adhesive is pushed away with the insertion of the magnet into the slot and enters the concave portion and hardens, whereby the adhesive becomes a hardened piece integrated with the magnet, and the magnet moves in the direction of the rotation axis of the rotor. It is described that it is regulated.

JP 2008-154436 A JP 2010-142038 A JP-A-8-163834 JP-A-11-98735

  When the end plates are arranged on both sides of the rotor core in the axial direction and pressed against the rotor core in the axial direction as in the rotor of Patent Document 1, it is common to form the end plate as an annular member having the same outer dimensions as the rotor core. is there. One reason for this is that the end plate has a function of preventing the outer peripheral portion of the electromagnetic steel sheet located on the axially outer side from opening among the many electromagnetic steel sheets constituting the rotor core.

  On the other hand, it is conceivable to reduce the cost by reducing or omitting the end plate. In this case, the problem is how to prevent the opening of the outer peripheral portion of the electromagnetic steel sheet as described above. Regarding this problem, Patent Document 2 describes that an end plate function is achieved by an annular resin portion. However, it is conceivable that the strength is insufficient to prevent the electromagnetic steel sheet from being opened only by the resin portion. Moreover, the protrusion part described in patent document 3 makes it easy to press-fit a rotating shaft or a flame | frame with respect to an iron core, Comprising: The above-mentioned opening of the outer peripheral part of an electromagnetic steel plate is not prevented. Furthermore, Patent Document 4 only discloses that the adhesive that has entered and hardened into the concave portion becomes a hardened piece integrated with the magnet to restrict the magnet from moving in the direction of the rotation axis of the rotor. Therefore, it does not provide a solution for preventing the opening of the outer peripheral portion of the electrical steel sheet as described above.

  An object of the present invention is to provide a rotor core, a rotor for a rotating electrical machine used therefor, and a method for manufacturing a rotor core for a rotating electrical machine, which can prevent the opening of the outer peripheral portion of the electromagnetic steel sheet located on the axially outer side with a simple configuration. It is in.

The rotor core according to the present invention is a rotor core formed by laminating a large number of electromagnetic steel sheets in the axial direction, and is located near the outer peripheral portion of the electromagnetic steel sheet positioned on the outer side in the axial direction. A tongue-like anchor portion for preventing the opening of the outer peripheral portion of the steel plate is projected in the axial direction, and the anchor portion is disposed in a hole drilled from the axial end surface of the rotor core toward the inside of the core. The anchor portion is embedded in a resin that is solidified by being injected into the resin.

  In the rotor core according to the present invention, the hole is formed as a resin injection hole communicating with a magnet insertion hole for embedding a permanent magnet in the rotor core, and the anchor portion is formed on the electromagnetic steel sheet positioned on the outer side in the axial direction. A protruding piece formed at the edge of the drilled resin injection hole may be bent into the resin injection hole.

  Moreover, the rotor core which concerns on this invention WHEREIN: The through-hole which the resin inject | poured in the said resin injection hole penetrates in the plate | board thickness direction may be formed in the said anchor part.

  Moreover, the rotor core which concerns on this invention WHEREIN: The said anchor part may have the wide part which became wide in the back | inner side of the said resin injection hole.

  A rotor for a rotating electrical machine according to the present invention includes a rotor core having any one of the above configurations, a permanent magnet that is inserted into a magnet insertion hole of the rotor core and is fixed by resin injected into the resin injection hole, and the center of the rotor core And a rotor shaft fixed to the hole.

A method of manufacturing a rotor core for a rotating electrical machine according to the present invention includes a step of laminating a number of electromagnetic steel plates in the axial direction to form a rotor core, and a resin injection hole drilled from the axial end surface of the rotor core toward the inside of the core. A step of bending an anchor portion formed on an electromagnetic steel sheet positioned on the outer side in the axial direction in the rotor core, and injecting and solidifying resin into the resin injection hole, and an electromagnetic steel sheet positioned on the outer side in the axial direction of the rotor core. Embedding the anchor portion for preventing the opening of the outer peripheral portion in the resin.

  According to the rotor core according to the present invention, the rotor for a rotating electrical machine using the rotor core, and the method for manufacturing the rotor core for a rotating electrical machine, a tongue-like anchor portion protruding near the outer peripheral portion of the electromagnetic steel sheet positioned on the outer side in the axial direction However, by being embedded in a resin that has been injected and solidified into a hole formed in the rotor core, it functions as an anchor that can effectively prevent the outer peripheral portion of the electromagnetic steel sheet on the outer side in the axial direction from opening outward. Therefore, it is possible to reduce or eliminate the diameter of the end plate while preventing the electromagnetic steel sheet from opening outward in the axial direction with such a simple configuration.

It is a side view of the rotor for rotary electric machines which is one Embodiment of this invention. FIG. 2 is an end view of the rotor as viewed from the direction of arrow A in FIG. 1. It is an enlarged view of one magnetic pole comprised by two permanent magnets arrange | positioned at substantially V shape. FIG. 5 is a sectional view taken along line BB in FIG. 3. It is the C section enlarged view in FIG. (A) is a front view of an anchor part when it sees from the arrow D direction in FIG. 5, (b) is the EE sectional view taken on the line in FIG. It is a figure which shows the modification of an anchor part, (a) is a figure which shows the anchor part which has a wide part, (b) is a figure which shows the example in which one through-hole is formed in the anchor part which has a wide part, (C) is a figure which shows the example in which two through-holes are formed in the anchor part which has a wide part. (D)-(f) is a figure which shows the modification of an anchor part following FIG. 7A. (G)-(i) is a figure which shows the modification of an anchor part following FIG. 7B. It is a flowchart which shows the manufacturing method of a rotor core. It is a figure for demonstrating the opening of the outer peripheral part of the electromagnetic steel plate located in the axial direction edge part of a rotor core.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like.

  FIG. 1 is a side view of a rotor for a rotating electrical machine (hereinafter simply referred to as a rotor as appropriate) 10 according to an embodiment of the present invention, and FIG. 2 is viewed from the direction of arrow A in FIG. 2 is an end view of the rotor 10. FIG. The rotor 10 includes a rotor core 12, a rotor shaft 14, an end plate 16, and a caulking member 18. The rotor 10 is a permanent magnet embedded rotor in which a permanent magnet 20 is embedded in the rotor core 12.

  A cylindrical stator 22 is disposed on the outer periphery of the rotor 10. A predetermined gap is formed between the inner peripheral surface of the stator 22 and the outer peripheral surface of the rotor core 12. A stator coil (not shown) is wound around the inner periphery of the stator 22. When the stator coil is energized, a stator core made of, for example, a laminated iron core is excited to form a rotating magnetic field inside the stator 22, whereby the rotor 10 is driven to rotate. Details of the rotor core 12 will be described later.

  The rotor shaft 14 is a rotating shaft of the rotor 10 and is fixed through a shaft hole formed at the center of the rotor core 12. Both end portions 15a and 15b of the rotor shaft 14 projecting from both end surfaces 13a and 13b in the axial direction of the rotor core 12 are rotatably supported by bearing members (not shown). The rotor shaft 14 is formed into a stepped shape by cutting, for example, a round bar-shaped steel material.

  The rotor shaft 14 has a flange portion 24 that protrudes radially outward. The flange portion 24 is for stopping the rotor core 12 through the end plate 16. The flange portion 24 may have a shape that is continuous in the circumferential direction, or may be divided into a plurality of portions in the circumferential direction.

  The end plate 16 is an annular member having a smaller diameter than the rotor core 12 and is formed of, for example, an aluminum plate. The end plates 16 are disposed on both sides in the axial direction of the rotor core 12 and attached by being pressed against the axial end surfaces 13a and 13b of the rotor core 12 with a predetermined pressing force. The end plate 16 in the present embodiment does not have to perform the function of pressing the entire end surface 13a, 13b of the rotor core 12 which is a laminate of a plurality of or many electromagnetic steel plates in the axial direction, and therefore has a smaller diameter than the conventional one. Further, there is an advantage that the thickness can be reduced and the manufacturing cost can be reduced. In this embodiment, the rotor including the end plate will be described. However, the cost may be further reduced by omitting or eliminating the end plate.

  The caulking member 18 is for fixing the rotor core 12 sandwiched between the two end plates 16 in a state where the rotor core 12 is pressed against the flange portion 24 of the rotor shaft 14 with a predetermined pressing force. The caulking member 18 includes a cylindrical portion 19a that is extrapolated around the rotor shaft 14, and a flange-shaped pressing portion 19b that protrudes radially outward from one end portion of the cylindrical portion 19a. With the pressing portion 19b of the caulking member 18 pressing the rotor core 12 via the end plate 16, the cylindrical portion 19a of the caulking member 18 is locally in a caulking groove (not shown) formed on the outer periphery of the rotor shaft 14. It is pushed into and crimped. Thereby, the caulking member 18 is fixed on the rotor shaft 14. That is, the axial position of the rotor core 12 with respect to the rotor shaft 14 is fixed.

  The rotational position of the rotor core 12 with respect to the rotor shaft 14 is determined by fitting a key projecting from the inner periphery of the rotor core 12 and a key groove formed by extending in the axial direction on the rotor shaft 14. Alternatively, for example, when the rotor core 12 is fixed by shrink fitting, it may be fixed by shrink fitting with the rotational position of the rotor core 12 determined with respect to the rotor shaft 14. In the present embodiment, the caulking member 18 for caulking and fixing the rotor core 12 is described as a separate member. However, caulking claws for caulking and fixing the rotor core are integrally formed as a part of the rotor shaft 14. May be.

  As shown in FIG. 2, for example, eight magnetic poles 26 are provided on the rotor core 12. Each of the magnetic poles 26 is provided in the vicinity of the outer peripheral surface of the rotor core 12 and is arranged in a uniform manner in the circumferential direction. Each magnetic pole 26 is configured such that the two permanent magnets 20 are arranged in a substantially V shape toward the outer diameter side.

  Next, the rotor core 12 in the present embodiment will be described in detail with reference to FIGS. FIG. 3 is an enlarged view of one magnetic pole 26 constituted by two permanent magnets 20 arranged in a substantially V shape. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 is an enlarged view of a portion C in FIG. 6A is a front view of the anchor portion when viewed from the direction of arrow D in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line EE in FIG.

  The rotor core 12 is a steel plate laminate formed by laminating a number of electromagnetic steel plates punched and formed in a substantially annular shape in the axial direction, and has a substantially cylindrical outer peripheral surface 13c. As shown in FIG. 3, the two permanent magnets 20 are arranged in a substantially V shape on each magnetic pole 26 included in the rotor core 12 as described above. The permanent magnet 20 has a flat rectangular end face (and a cross section), and has an axial length substantially equal to or slightly shorter than the rotor core 12. The permanent magnet 20 is inserted into the magnet insertion hole 28 formed in the rotor core 12 and provided in the rotor core 12. The permanent magnet 20 is inserted into the magnet insertion hole 28 from the end face 13a or 13b of the rotor core 12, and as will be described later, resin is injected into the gap between the inner wall surface of the hole 28 and the permanent magnet 20 and solidifies. As a result, the permanent magnet 20 is fixed in the hole 28.

  On the inner side in the circumferential direction of the magnet insertion hole 28, a leakage magnetic flux suppression hole 30 is formed in communication. Leakage magnetic flux suppression hole 30 includes a gap whose magnetic permeability is lower than that of an electromagnetic steel sheet, and has a function of suppressing a short-circuiting of the magnetic flux around the short side surface at the radially inner end of permanent magnet 20. . The two leakage flux suppressing holes 30 are opposed to each other with a narrow bridge portion 32 made of an electromagnetic steel plate interposed therebetween.

  On the other hand, a resin injection hole 34 is formed in communication with the outer side in the circumferential direction of the magnet insertion hole 28. The resin injection hole 34 is located in the vicinity of the outer peripheral portion of the rotor core 12 and is formed by extending in the axial direction from the axial end surface 13a or 13b of the rotor core 12 toward the inside of the core. The resin injection hole 34 faces the outer peripheral surface 13c of the rotor core 12 through a thin bridge portion 36 made of an electromagnetic steel plate. That is, the resin injection hole 34 is located on the radially inner side away from the outer peripheral surface 13 c of the stator core 12.

  After the permanent magnet 20 is inserted into the magnet insertion hole 28, the resin injection hole 34 is filled or filled with a resin 38 having fluidity from the core end surface 13a or 13b. For the resin 38, a thermosetting resin such as an epoxy resin is preferably used. As shown in FIGS. 4 and 5, the resin injected into the resin injection hole 34 enters between the inner wall surface 29 of the magnet insertion hole 28 and the axial side surface 21 a of the permanent magnet 20 and is filled therewith. Then, the resin 38 is cured and solidified by heat treatment, whereby the permanent magnet 20 is bonded and fixed.

  Similarly to the leakage flux suppressing hole 30, the resin injection hole 34 is filled with a resin 38 having a magnetic permeability lower than that of the electromagnetic steel plate, so that the magnetic flux has a short side at the radially outer end of the permanent magnet 20. It also has a function to suppress short-circuiting around the side surface.

  The resin 38 injected into the resin injection hole 34 covers the axial end of the permanent magnet 20 located slightly behind the axial end surface 13a or 13b of the rotor core 12 and closes the opening of the magnet insertion hole 28. But you can. Thereby, it can prevent more reliably that the permanent magnet 20 slips out from the magnet insertion hole 28.

  As shown in FIGS. 3 and 5, an anchor portion 40 to be embedded in the resin 38 injected into the hole is formed at the edge of the resin injection hole 34. As shown in FIG. 6A, the anchor portion 40 has a substantially rectangular tongue shape. Further, the anchor portion 40 is formed with, for example, a circular through hole 42. As shown in FIG. 6B, the through hole 42 is more effective in retaining the anchor portion 40 in the resin 38 by the resin 38 injected into the hole 34 penetrating and solidifying. . However, the through hole 42 is not an essential requirement in the present invention.

  The anchor portion 40 has a rectangular tongue-shaped projecting piece formed integrally with the edge of the resin injection hole 34 formed in the electromagnetic steel plate 131 positioned on the outermost side in the axial direction in the rotor core 12 inside the resin injection hole 34. For example, it is formed by being bent by about 90 degrees. Moreover, it is preferable that the anchor part 40 is formed in the edge part near the outer periphery near the core outer peripheral surface 13c in the resin injection hole 34. However, the formation position of the anchor portion 40 is not limited to this, and may be formed at the edge portion located on the outer side in the circumferential direction of the magnetic pole 26 as indicated by a one-dot chain line 44 in FIG. 5 may be formed on the edge located on the radially inner side as indicated by a one-dot chain line 46 in FIG. Alternatively, the number of anchor portions 40 may not be one in one resin injection hole 34, and two or more anchor portions 40 may be provided.

Moreover, the shape of the anchor part 40 is not limited to a substantially rectangular shape, and may be various shapes such as a triangle, a semicircle, and a trapezoid. For example, by using the trapezoidal anchor portion 40, the anchor portion 40 becomes wider in the resin 38, so that it is difficult for the anchor portion 40 to come out, so that the anchor effect can be further improved. In order to obtain the same effect, as shown in FIG. 7A (a), the anchor portion 40 may have a widened portion 41 protruding in a rectangular shape in at least one lateral direction. In this case, as shown in FIG. 7A (b), a through hole 42 may be formed in the anchor portion 40, or a plurality of through holes 42 are formed in the anchor portion 40 as shown in FIG. 7A (c). Also good. Note that the protruding shape of the widened portion 41 is not limited to a rectangular shape, and may be other shapes such as a semicircular shape and a triangular shape as long as the shape is widened behind the resin injection hole. Furthermore, the anchor portion 40 may have a shape with a narrow width on the back side of the tree seed injection hole 34 as shown in FIG. 7B (d), or a rectangular frame shape as shown in FIG. 7B (e). The shape may include the through-hole 42, or may be configured with a plurality of tongue-like portions as shown in FIG. 7B (f). Furthermore, the anchor portion 40 may be formed in a substantially L shape as shown in FIG. 7C (g), may be formed in a substantially J shape as shown in FIG. 7C (h), Alternatively, as shown in FIG. 7C (i), it may have a triangular frame shape and include a through hole 42.

  Next, with reference to FIG. 8, the manufacturing method of the rotor core 12 of this embodiment is demonstrated.

  First, the rotor core 12 is formed by laminating a large number of electromagnetic steel sheets punched into a ring in the axial direction (S10). At this time, each steel plate which comprises the rotor core 12 is formed in the steel plate laminated body integrally connected by methods, such as caulking, welding, adhesion | attachment.

  Next, with respect to the electromagnetic steel sheet 131 arranged on the outermost side in the axial direction, the anchor piece 40 is formed by bending the protruding piece portion at the edge of the resin injection hole 34 (S12). However, you may form the anchor part 40 previously before lamination | stacking of an electromagnetic steel plate.

  Subsequently, the permanent magnet 20 is inserted into the magnet insertion hole 28 from the axial end surface 13a or 13b of the rotor core 12 and disposed inside the core (S14). Then, the rotor core 12 is set in the mold, and the resin 38 is injected into the resin injection hole 34 and solidified (S16). When a thermosetting resin is used as the resin 38, the resin 38 is cured by heating the rotor core 12 after the resin is injected. As a result, the anchor portion 40 located in the resin injection hole 34 is embedded in the injected resin 38.

  Next, the opening and closing of the outer peripheral portion of the electromagnetic steel sheet located at the axial end of the rotor core 12 will be described with reference to FIG. 9, and the operation and effect of the rotor core 12 of the present embodiment will be described.

  If the pressing force does not act on the outer peripheral portion of the rotor core 12 by reducing (or eliminating) the diameter of the end plate 16, as shown in FIG. In some cases, the outer peripheral portion of the electromagnetic steel sheet 131 located in the direction of 50 may open in the direction of the arrow 50. This is because the permanent magnet 20 is embedded in the rotor core 12 so that a repulsive force acts between the electromagnetic steel plates, and the magnetic force generated from the stator 22 because the stator 22 is positioned on the outer side in the axial direction than the rotor core 12. Is generated due to the electromagnetic steel plate 131 being attracted by the force, the pressing force by the caulking member 18 and the pressing force by the caulking portion for connecting the electromagnetic steel plates to the inner peripheral portion of the rotor core 12. To do.

  On the other hand, when the rotor 10 rotates, the electromagnetic steel plate 131 is deformed by returning to the direction of the arrow 52 from the open state as described above due to the centrifugal force, and is in contact with the adjacent electromagnetic steel plate 131 or closed. It becomes a state. When such deformation repeatedly occurs, a stress repeatedly acts on the outer peripheral portion of the electromagnetic steel sheet 131, and as a result, the outer peripheral portion of the electromagnetic steel sheet 131, in particular, the bridge portions 32 and 36 (see FIG. 3) having low strength are broken. Can happen.

  On the other hand, in the rotor core 12 of the present embodiment, the anchor portion 40 is provided in the electromagnetic steel sheet 131 located on the outermost side in the axial direction, and the anchor portion 40 is injected into the resin injection hole 34 and solidified in the resin 38. Embedded. Thereby, the outer peripheral part of the said electromagnetic steel plate 131 is restrained, It can suppress or prevent opening to an axial direction outer side. Therefore, the end plate 16 can be reduced in diameter (or abolished) while preventing the electromagnetic steel plate 131 from opening outward in the axial direction with a simple configuration in which the electromagnetic steel plate 131 is provided with the tongue-shaped anchor portion 40. become.

  Although the rotor core of the present embodiment and the rotor using the rotor core have been described above, the present invention is not limited to the above-described configuration, and various changes and improvements can be made.

  For example, in the above description, the resin injection hole 34 is formed in communication with the magnet insertion hole 28 and functions as a leakage flux suppressing hole. However, the resin injection hole is separately provided at a position away from the magnet insertion hole. May be. In this case, the resin injection hole need not be formed through the entire length in the axial direction of the rotor core, and may be formed from the axial end surface of the rotor core to an appropriate depth.

  In the above description, the anchor portion 40 is provided on the electromagnetic steel plate 131 positioned on the outermost side in the axial direction of the rotor core 12. In addition, the second electromagnetic steel plate 132 is connected to the second electromagnetic steel plate 132 from the axial end surfaces 13 a and 13 b. 5 may be provided, for example, at a position indicated by a one-dot chain line 44 in FIG. 5, and a third anchor portion may be provided on the third electromagnetic steel plate 133 from the axial end faces 13a, 13b, for example, one point in FIG. You may provide in the position shown with the chain line 46. FIG. By doing in this way, the opening of an outer peripheral part can be suppressed or prevented about the several electromagnetic steel plate located in the axial direction outer side.

  Furthermore, although the permanent magnet embedded type rotor has been described in the above embodiment, the present invention may be applied to a rotor core for a rotating machine without a permanent magnet. Even in a magnetless rotor core, the above-described opening of the electromagnetic steel sheet can occur due to the magnetic attractive force from the stator and the pressing force of the inner peripheral portion of the rotor core. Therefore, by applying the present invention also to the magnetless rotor core, the opening of the outer peripheral portion of the electromagnetic steel sheet can be effectively suppressed.

  Furthermore, in the above-described embodiment, it has been described that the permanent magnet is arranged in the magnet insertion hole, the resin is poured, and then the permanent magnet is fixed by heating. However, the present invention is not limited to this, and before magnetizing. The magnet intermediate body may be fixed in the magnet insertion hole, and then the rotor core may be set in a magnetizing device to magnetize the magnet intermediate body.

  DESCRIPTION OF SYMBOLS 10 Rotor for rotary electric machines, 12 Rotor core, 13a, 13b Axial end surface, 13c Outer peripheral surface, 14 Rotor shaft, 15a, 15b Shaft end, 16 End plate, 18 Caulking member, 19a Cylindrical part, 19b Press part, 20 Permanent magnet , 21a Axial side surface, 22 Stator, 24 Flange part, 26 Magnetic pole, 28 Magnet insertion hole, 29 Inner wall surface, 30 Leakage magnetic flux suppression hole, 32, 36 Bridge part, 34 Resin injection hole, 38 Resin, 40 Anchor part, 41 Widened portion, 42 through-hole, 131, 132, 133 electrical steel sheet.

Claims (6)

A rotor core formed by laminating a number of electromagnetic steel sheets in the axial direction,
In the vicinity of the outer peripheral portion of the electromagnetic steel sheet positioned on the outer side in the axial direction, a tongue-like anchor portion for preventing the opening of the outer peripheral portion of the electromagnetic steel sheet positioned on the outer side in the axial direction of the rotor core is provided in the axial direction
The anchor portion is disposed in a hole drilled from the axial end surface of the rotor core toward the inside of the core,
The anchor is embedded in a resin that is injected into the hole and solidified.
Rotor core. The rotor core according to claim 1,
The hole is formed as a resin injection hole communicating with a magnet insertion hole for embedding a permanent magnet in the rotor core, and the anchor portion is formed of the resin injection hole formed in the electromagnetic steel sheet located on the outside in the axial direction. A rotor core, wherein a projecting piece formed on an edge of a hole is bent into the resin injection hole. The rotor core according to claim 1 or 2,
The anchor core is formed with a through-hole through which the resin injected into the resin injection hole penetrates in the plate thickness direction. The rotor core according to any one of claims 1 to 3,
The rotor core is characterized in that the anchor portion has a widened portion that is wide on the back side of the resin injection hole. The rotor core according to any one of claims 2 to 4,
A permanent magnet that is inserted into the magnet insertion hole of the rotor core and fixed by the resin injected into the resin injection hole;
A rotor shaft fixed to a central hole of the rotor core;
A rotor for a rotating electrical machine. A method of manufacturing a rotor core for a rotating electrical machine,
A process of forming a rotor core by laminating a number of electromagnetic steel sheets in the axial direction;
Bending the anchor portion formed on the electromagnetic steel sheet positioned on the outer side in the axial direction in the rotor core into the resin injection hole drilled from the axial end surface of the rotor core toward the inside of the core;
Injecting and solidifying resin into the resin injection hole, and embedding the anchor portion in the resin for preventing the opening of the outer peripheral portion of the electromagnetic steel sheet located outside the rotor core in the axial direction ;
A method for manufacturing a rotor core for a rotating electrical machine.

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