JP2019213431A - Rotor for rotary electric machine - Google Patents

Abstract

To provide a rotor for a rotary electric machine capable of restraining leakage of resin to the outside of a rotor core, when filling a pore in the rotor core for placing a permanent magnet with resin.SOLUTION: A rotor for a rotary electric machine comprises a rotor core formed by laminating multiple disk-shaped magnetic steel sheets 40 of in the axial direction, and permanent magnets placed in magnet insertion holes formed in the rotor core by permanent magnet pores 41 of the magnetic steel sheets 40 continuous in the axial direction. In some magnetic steel sheets 40, a thin wall part 52 having board thickness thinner than a general part 51 is formed between the magnet pore 41 and the outer peripheral edge 40a of the magnetic steel sheet 40, and a weir section 11 of the same thickness as the general part 51 extending in a direction intersecting the direction connecting the magnet pore 41 and the outer peripheral edge 40a is formed adjacently to the thin wall part 52.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotor for a rotating electrical machine.

  Japanese Patent Laying-Open No. 2011-182552 discloses a rotor (130) for a rotating electrical machine having a rotor core (131) configured by laminating a plurality of electromagnetic steel plates (135) (in parentheses in the background art). The reference is from the referenced document.) A plurality of magnet insertion holes (133) are formed in the rotor core (131), and permanent magnets (132) are inserted into the respective magnet insertion holes (133). The magnet insertion hole (133) is filled with resin (134), and the permanent magnet (132) is fixed to the rotor core (131) with resin (134). The magnet insertion hole (133) is formed by arranging holes (138) formed in each of the laminated electromagnetic steel sheets (135) in the stacking direction. A groove (140) continuous to the hole (138) is formed on one surface (136) of the flat electromagnetic steel sheet (135), and the thickness of the electromagnetic steel sheet (135) in the groove (140) is the other part. It is formed thinner than. For this reason, a gap is generated between the electromagnetic steel sheets (135) adjacent in the stacking direction by the amount of the groove (140). Since the groove (140) is provided continuously with the hole (138) that forms the magnet insertion hole (133), the resin (134) filled in the magnet insertion hole (133) is also present in the groove (140). Filled. Thereby, the electromagnetic steel plates (135) adjacent in the stacking direction are also firmly fixed by the resin (134).

  The groove (140) is formed so as to partially reach the outer peripheral edge (the outer peripheral surface of the rotor core (131)) of the electromagnetic steel plate (135), and the resin (134) also reaches the outer peripheral surface of the rotor core (131). Filled. When the resin (134) is filled, the outer peripheral surface of the laminate (150) of the plurality of electromagnetic steel plates (135) is accommodated in the accommodating case (164), and the outer peripheral surface of the laminate (150) There is also a possibility that the resin (134) leaks into a slight gap between the inner peripheral surface of the housing case (164). The resin (134) leaked and hardened from the outer peripheral surface of the laminate (150) is peeled off when the rotor (130) rotates and becomes a foreign object in the rotating electrical machine, or damages the stator coil to reduce the insulation. There is a possibility.

JP 2011-182552 A

  In view of the above background, it is desired to provide a rotor for a rotating electrical machine that can suppress the leakage of resin to the outside of the rotor core when filling the hole in which the permanent magnet of the rotor core is disposed with resin.

  In one aspect, a rotor for a rotating electrical machine in view of the above has a rotor core formed by laminating a plurality of annular steel plates in the axial direction, and a magnet hole in the electromagnetic steel plate in the axial direction. A permanent magnet disposed in a magnet insertion hole formed in the rotor core in a row, wherein the magnet insertion hole is a rotor for a rotating electrical machine, and at least a part of the electromagnetic steel sheet includes A thin portion with a plate thickness along the axial direction that is thinner than a general portion is formed between the hole for magnet and the outer peripheral edge of the electromagnetic steel sheet, connecting the general portion around the thin portion, A weir portion extending along a direction intersecting the direction connecting the magnet hole and the outer peripheral edge and having the same plate thickness as the general portion is formed adjacent to the thin portion.

  When configuring the rotor for a rotating electrical machine, the rotor core and the permanent magnet are fixed by filling the magnet insertion hole with resin. If the thin wall portion is formed between the outer peripheral edge of the electromagnetic steel sheet and the magnet hole, an opening is generated on the outer peripheral surface of the rotor core along the radial direction from the magnet insertion hole. And resin may leak from this opening. However, by providing the weir portion as described above, the resin heading from the magnet insertion hole toward the outer peripheral surface of the rotor core along the radial direction is blocked. Therefore, the resin is prevented from leaking to the outer peripheral surface of the rotor core. That is, according to this configuration, when the resin in the hole in which the permanent magnet of the rotor core is disposed is filled with resin, leakage of the resin to the outside of the rotor core can be suppressed.

  Further features and advantages of the rotor for a rotating electrical machine will become clear from the following description of embodiments described with reference to the drawings.

A plan view in an axial view schematically showing an example of a rotating electrical machine Perspective view showing a part of the rotor Perspective view showing a part of electrical steel sheet A plan view in an axial view schematically showing an example of a thin portion and a weir portion of an electrical steel sheet A plan view in an axial view schematically showing an example of a thin portion and a weir portion of an electrical steel sheet A plan view in an axial view schematically showing an example of a thin portion and a weir portion of an electrical steel sheet A plan view in an axial view schematically showing an example of a thin portion and a weir portion of an electrical steel sheet Partial plan view as viewed in the axial direction schematically showing another example of the arrangement of the permanent magnets Partial plan view as viewed in the axial direction schematically showing another example of the arrangement of the permanent magnets Partial plan view as viewed in the axial direction schematically showing another example of the arrangement of the permanent magnets

  Hereinafter, embodiments of a rotor for a rotating electrical machine will be described with reference to the drawings. The rotating electrical machine 1 of this embodiment is used as a driving force source for wheels in, for example, a hybrid vehicle or an electric vehicle. As shown in FIG. 1, the rotating electrical machine 1 includes a stator 2 and a rotor 3 (rotor for a rotating electrical machine). The stator 2 is fixed to a non-rotating member (not shown) such as a case. The rotor 3 is rotatably supported on the radially inner side R <b> 2 of the stator 2. That is, the rotor 3 is configured as an inner rotor type rotor for a rotating electrical machine.

  The stator 2 includes a stator core 20 and a stator coil 25 disposed on the stator core 20. Here, a concentrated winding type stator is illustrated. The rotor 3 has a rotor core 30 and a permanent magnet 35. A plurality of magnet insertion holes 31 are formed in the rotor core 30, and permanent magnets 35 are inserted into the plurality of magnet insertion holes 31, respectively. The permanent magnet 35 is embedded in the rotor core 30 so as to penetrate the rotor core 30 in the axial direction L (see FIG. 2 and the like). That is, the rotating electrical machine 1 is an interior magnet type rotating electrical machine.

  The permanent magnet 35 has a rectangular cross-sectional shape (hereinafter simply referred to as “cross-sectional shape”) in a plane orthogonal to the axial direction L. Here, the two permanent magnets 35 arranged in the circumferential direction C are arranged in a V-shape projecting toward the side opposite to the stator 2 side (radially inner side R2), and one magnetic pole P Is configured.

  The pair of permanent magnets 35 constituting each magnetic pole P is arranged with the magnetic pole surface 35a having the same polarity (N pole or S pole) facing the stator 2 side (radially outer side R1). The two magnetic poles P adjacent in the circumferential direction C have opposite polarities, and the pair of permanent magnets 35 belonging to one magnetic pole P and the pair of permanent magnets 35 belonging to the other magnetic pole P have different polarities ( The magnetic pole surface 35a of N pole / S pole) is arranged toward the stator 2 side (radially outer side R1).

  The magnetic pole surface 35a is an outer surface orthogonal to the magnetization direction (magnetization direction), and is a surface through which the magnetic flux of the permanent magnet 35 mainly enters and exits. In the present embodiment, the permanent magnets 35 having a rectangular cross-sectional shape are each magnetized in a direction parallel to the short side. Thereby, of the outer peripheral surface of the permanent magnet 35 (four surfaces forming the outer edges of the cross section orthogonal to the axial direction L), the two surfaces forming the long side of the rectangle become the magnetic pole surface 35a.

  As shown in FIG. 2, the rotor core 30 is formed by laminating a plurality of annular plate-shaped electromagnetic steel plates 40 in the axial direction L. As shown in FIG. 3, the electromagnetic steel sheet 40 is formed so that the plate thickness along the axial direction L becomes the reference thickness in the general part 51 which is the majority of the electromagnetic steel sheet 40. The reference thickness can be set to 0.1 mm to 0.5 mm, for example, and is generally about 0.35 mm. As shown in FIG. 3, a magnet hole 41 is formed in the electromagnetic steel sheet 40. As shown in FIG. 2, the magnet insertion hole 31 is formed in the rotor core 30 with the magnet hole 41 of the electromagnetic steel plate 40 being continuous in the axial direction L.

  As shown in FIG. 3, the magnet hole 41 includes a magnet housing hole 41A and a magnetic barrier hole 41B. As described above, since the magnet hole 41 of the electromagnetic steel plate 40 is connected to the axial direction L to form the magnet insertion hole 31, the magnet insertion hole 31 is formed with the magnet housing portion 31A and the magnetism as shown in FIG. And a barrier unit 31B. Hereinafter, unless otherwise specified, the magnet hole 41 (magnet accommodating hole 41A, magnetic barrier hole 41B) and the magnet insertion hole 31 (magnet accommodating portion 31A, magnetic barrier 31B) are handled in the same manner. The magnet housing hole 41 </ b> A (magnet housing portion 31 </ b> A) is a part that houses and holds the permanent magnet 35. The magnetic barrier hole 41B (magnetic barrier part 31B) is a part that functions as a magnetic resistance against the magnetic flux flowing through the electromagnetic steel sheet 40 (rotor core 30). The magnetic barrier hole 41B is provided at both end portions of the magnet housing hole 41A so as to continue from the magnet housing hole 41A in the longitudinal direction (generally, the circumferential direction C of the rotor 3).

  After the permanent magnet 35 is accommodated, resin is injected into the magnetic barrier portion 31B of the magnet insertion hole 31 and includes the gap between the permanent magnet 35 and the rotor core 30 (inner wall of the magnet insertion hole 31) in the magnet accommodation portion 31A. The magnet insertion hole 31 is filled with resin. The permanent magnet 35 is fixed to the rotor core 30 by resin.

  As shown in FIG. 3, the electromagnetic steel sheet 40 has an outer peripheral side bridge portion 44 and an intermagnet bridge portion 45 in each magnetic pole P, and an intermagnetic pole bridge portion 46 between a pair of magnetic poles P adjacent in the circumferential direction C. Have in between. The outer peripheral bridge portion 44 is formed between the magnet hole 41 (specifically, the magnetic barrier hole 41B on the radially outer side R1 on the stator 2 side) and the outer peripheral edge 40a of the electromagnetic steel sheet 40. ing. The outer peripheral side bridge portion 44 extends along the outer peripheral edge 40 a of the electromagnetic steel sheet 40 and connects the magnetic path in the magnetic pole P and the magnetic path between the magnetic poles P in the circumferential direction C.

  The inter-magnet bridge portion 45 is formed between a pair of permanent magnets 35 constituting each magnetic pole P. The inter-magnet bridge portion 45 has a pair of magnet holes 41 in which permanent magnets 35 of the same polarity are inserted (specifically, a magnetic barrier hole 41B on the radially inner side R2 opposite to the stator 2). It is formed between each other. The inter-magnet bridge portion 45 connects the magnetic path in the magnetic pole P and the magnetic path between the magnetic poles P in the radial direction R.

  The inter-magnetic pole bridge section 46 is a permanent magnet 35 that constitutes one magnetic pole P (for example, N pole) of a pair of magnetic poles P adjacent in the circumferential direction C, and a permanent that constitutes the other magnetic pole P (for example, S pole). It is formed between the magnet 35. The inter-magnetic pole bridge portion 46 is formed between the magnet hole portions 41 (specifically, the magnetic barrier hole portions 41B on the radially outer side R1) of the permanent magnets 35 having different polarities. The inter-magnetic pole bridge portion 46 is formed so as to include the outer peripheral edge 40a of the electromagnetic steel plate 40, and connects two outer peripheral bridge portions 44 belonging to the magnetic poles P having different polarities in the circumferential direction C. . The inter-magnetic pole bridge portion 46 forms a magnetic path between the magnetic poles P.

  As shown in FIG. 3, the electromagnetic steel plate 40 is formed with a thin portion 52 whose plate thickness along the axial direction L is thinner than the plate thickness (reference thickness) of the general portion 51. The thin portion 52 is formed so that the boundary portion between the general portion 51 and the thin portion 52 is tapered so that the plate thickness gradually decreases from the general portion 51 along the surface direction of the electromagnetic steel sheet 40 ( 4 to 7). The plate thickness of the thin portion 52 is preferably about 40% to 95% of the plate thickness (reference thickness) of the general portion 51. The thin portion 52 can be formed by, for example, pressing. When the electromagnetic steel sheet 40 is partially compressed in the thickness direction (axial direction L) by pressing, the density of the portion increases and work hardening can be expected. For this reason, the thin portion 52 has a higher hardness than the general portion 51. Even if the plate thickness is reduced, the mechanical strength of the rotor 3 can be maintained high.

  As shown in FIG. 3, the thin portion 52 is formed between the magnet hole 41 and the outer peripheral edge 40 a of the electromagnetic steel plate 40. Specifically, a thin portion 52 is formed between the magnetic barrier hole 41 </ b> B on the radially outer side R <b> 1 in the magnet hole 41 and the outer peripheral edge 40 a of the electromagnetic steel plate 40. That is, the thin portion 52 is formed in the outer peripheral side bridge portion 44. As described above, the outer bridge portion 44 connects the magnetic path in the magnetic pole P and the magnetic path between the magnetic poles P in the circumferential direction C. By making the plate | board thickness of the outer peripheral side bridge | bridging part 44 thinner than the general part 51, the magnetic path cross-sectional area of the said part can be made small and a magnetic resistance can be enlarged. Therefore, it is difficult for the magnetic flux passing through this portion to flow, and short-circuiting of the magnetic flux of the permanent magnet 35 can be suppressed. Since the electromagnetic steel sheet 40 is only partially thinned, the strength reduction of the rotor core 30 is limited as compared with the case where the magnetic barrier hole 41B is widened. Further, as described above, when the thin portion 52 is formed by press working, the thin portion 52 has high hardness due to work hardening or the like. Therefore, short-circuiting of the magnetic flux of the permanent magnet 35 can be suppressed while maintaining the mechanical strength of the rotor 3.

  In consideration of the magnetic resistance in the outer peripheral side bridge portion 44, it is preferable to form the thin portion 52 until the outer peripheral edge 40a of the electromagnetic steel sheet 40 is reached. However, as described above, after the permanent magnet 35 is accommodated in the magnet insertion hole 31, the resin is injected into the magnetic barrier portion 31B, and the magnet including the gap between the permanent magnet 35 and the rotor core 30 in the magnet accommodation portion 31A is included. The insertion hole 31 is filled with resin. At this time, if the thin-walled portion 52 is formed up to the outer peripheral edge 40a, the resin may leak from the magnetic barrier portion 31B to the radially outer side R1 of the outer peripheral edge 40a via the thin-walled portion 52. When injecting the resin, the rotor core 30 is housed in a case (not shown) in which the outer peripheral surface 30a (see FIG. 2) is in close contact, but the resin leaks into a slight gap between the outer peripheral surface 30a and the case. there is a possibility. The resin that has leaked and hardened from the outer peripheral surface 30a may be peeled off when the rotor 3 rotates and become a foreign substance in the rotating electrical machine 1, or the stator coil 25 may be damaged to reduce insulation.

  For this reason, as shown in FIG. 3, the electromagnetic steel sheet 40 extends along a direction intersecting the direction connecting the general portion 51 around the thin portion 52 and connecting the magnet hole 41 and the outer peripheral edge 40 a. The dam portion 11 having the same thickness as that of the general portion 51 is formed adjacent to the thin portion 52. Since the weir part 11 has the same thickness as that of the general part 51, the weir part 11 is in close contact with the electromagnetic steel sheet 40 adjacent in the axial direction L. Accordingly, the resin that moves from the magnetic barrier portion 31 </ b> B to the radially outer side R <b> 1 of the outer peripheral edge 40 a through the thin portion 52 is blocked by the dam portion 11. Thereby, it is suppressed that resin leaks to the outer peripheral surface 30a of the rotor core 30.

  By the way, the magnetic barrier portion 31B is continuous in the axial direction L in a state where the electromagnetic steel plates 40 are laminated. Therefore, when the resin is injected from the end portion of the rotor core 30 in the axial direction L, the magnetic barrier portion 31B is excellent along the axial direction L. Resin can be filled. On the other hand, resin is supplied from the magnetic barrier portion 31 </ b> B (magnet insertion hole 31) along the radial direction R to the space formed between the thin portion 52 and the electromagnetic steel sheet 40 adjacent in the axial direction L.

  Since the thickness of the weir part 11 in the axial direction L is the same as that of the general part 51, the weir part 11 is in close contact with another electromagnetic steel sheet (40) adjacent to the axial direction L. For this reason, the space surrounded by the thin portion 52, the other electromagnetic steel sheet 40 adjacent to the axial direction L, and the weir portion 11 is open in the direction of the magnet insertion hole 31, but the side of the outer peripheral edge 40a is It becomes a closed space. As described above, the resin is supplied from the magnet insertion hole 31 side, but the resin does not sufficiently enter due to the pressure of air present in the space closed by the dam portion 11, and the thin portion 52 and the axial direction L There is a possibility that a so-called void may be generated without being filled with resin between the magnetic steel sheet 40 adjacent to the steel sheet.

  Therefore, as shown in FIG. 3, the dam portion 11 is formed along the radial direction R so that the dam portion 11 communicates with the magnet hole 41 side and the outer peripheral edge 40 a side. 12 is preferred. It is sufficient for the groove 12 to be large enough to allow air to escape from the above-described sealed space to the outer peripheral surface 30 a of the rotor core 30. It is preferable to keep the size of the groove 12 so that a resin having a viscosity much higher than that of air does not escape to the outer peripheral surface 30a of the rotor core 30 due to the injection pressure of the resin.

  In addition, about the position etc. which provide the dam part 11, various forms can be considered so that it may illustrate typically in FIGS. 4-7. FIG. 4 illustrates a form in which the dam portion 11 is formed on the outer peripheral edge 40 a side with respect to the thin portion 52. That is, in this embodiment, the dam portion 11 is formed along the outer peripheral side boundary 52a that is the boundary on the outer peripheral edge 40a side of the thin portion 52. In this form, since the area of the thin part 52 filled with the resin can be widened, the electromagnetic steel sheets 40 adjacent to each other in the axial direction L can be firmly fixed by the resin.

  FIG. 5 illustrates a form in which the dam portion 11 is formed at an intermediate position in the direction connecting the outer peripheral edge 40 a and the magnet hole 41 in the thin portion 52. Since the thin portion 52 is thinner than the general portion 51, the strength of the electromagnetic steel plate 40 and the rotor core 30 may be reduced. In this form, since the thin part 52 is arrange | positioned at the both sides of radial direction R with respect to the dam part 11, when the thin part 52 is arrange | positioned with respect to the dam part 11 at one side of radial direction R (refer FIG. 4). Thus, as compared with the above-described embodiment and the embodiment described later with reference to FIG. 6, it is possible to reduce the bias of the residual stress when the thin portion 52 is formed. Therefore, deformation of the electromagnetic steel sheet 40 due to such residual stress can be suppressed to a small extent. In addition, the area is smaller than the form in which the thin part 52 is provided on the outer peripheral edge 40a side with respect to the thin part 52 (the form described above with reference to FIG. 4), but the resin filled in the thin part 52 The electromagnetic steel plates 40 adjacent to each other in the axial direction L can also be firmly fixed.

  FIG. 6 illustrates a mode in which the dam portion 11 is formed on the magnet hole 41 side with respect to the thin portion 52. In this embodiment, since the space surrounded by the thin portion 52, the other electromagnetic steel plate 40 adjacent to the axial direction L, and the weir portion 11 opens to the outer peripheral surface of the rotor core 30, the surface area of the outer peripheral surface 30a of the rotor core 30 is increased. Can be increased. Therefore, the cooling performance of the rotor 3 can be improved. In addition, since the space surrounded by the thin portion 52, the other electromagnetic steel plate 40 adjacent to the axial direction L, and the weir portion 11 does not open to the magnet insertion hole 31, the space is filled with resin. And so-called voids can be avoided. In this embodiment, since the resin is not filled in the space between the thin-walled portion 52 and another electromagnetic steel plate 40 adjacent in the axial direction L, the dam portion 11 does not have to be provided with the groove portion 12 for venting air. . FIG. 6 illustrates an example in which the groove portion 12 is not provided in the dam portion 11.

  In the form shown in FIG. 7 as well, the weir part 11 is formed along the outer peripheral side boundary 52a that is the boundary on the outer peripheral edge 40a side of the thin part 52, similarly to the form shown in FIG. However, in the form shown in FIG. 4, the outer peripheral side boundary 52 a is along the outer peripheral edge 40 a, whereas in the form shown in FIG. 7, the outer peripheral side boundary 52 a has an arcuate shape that is convex toward the outer peripheral edge 40 a. is there. The weir part 11 is formed along this arcuate outer peripheral side boundary 52a, and the groove part 12 is formed at a position closest to the outer peripheral edge 40a in the outer peripheral side boundary 52a.

  In this embodiment, since the width of the dam portion 11 in the radial direction R can be relatively large, the strength of the dam portion 11 can be increased. Moreover, since the outer peripheral side boundary 52a is a convex arc shape toward the outer peripheral edge 40a, in the space surrounded by the thin wall portion 52, the other electromagnetic steel sheet 40 adjacent to the axial direction L, and the weir portion 11, It is hard to produce a corner. In addition, since the groove portion 12 is formed at a position where the distance between the thin portion 52 and the outer peripheral edge 40a is the shortest, air can be appropriately extracted from the space through a short path. Thus, in this form, while making it difficult to produce the area | region which is not filled with resin in the space enclosed by the thin part 52, the other electromagnetic steel plate 40 adjacent to the axial direction L, and the weir part 11, in the said space , So-called voids can be suppressed.

  As described above, in the embodiment described with reference to FIGS. 4 to 7, the thin portion 52 is formed on the bridge portion (outer peripheral side bridge portion 44) disposed on the outer peripheral edge 40 a side of the permanent magnet 35, and the thin wall portion is formed. The form in which the dam portion 11 is formed adjacent to the portion 52 has been described. However, as shown in FIGS. 2 and 3, the thin-walled portion 52 is a bridge portion (inter-magnet bridge portion) formed between a pair of permanent magnets 35 (magnet hole portions 41) constituting each magnetic pole P. 45).

In the above description, referring to FIGS. 1 to 3, the magnet housing hole 41A (magnet housing portion 31A) and the magnetic barrier hole 41B (magnetic barrier portion 31B) are integrally formed for the magnet. The form formed as the hole part 41 (magnet insertion hole 31) was illustrated. However, as shown in FIG.
The electromagnetic steel plate 40 (rotor core 30) may have a magnetic flux limiting hole 42 (magnetic flux limiting hole 32) different from the magnet hole 41 (magnet insertion hole 31). In this case, a hatched region is also formed in the bridge portion (magnetic pole bridge portion 47) between the permanent magnet 35 (magnet hole portion 41) and the magnetic flux limiting hole portion 42 constituting each magnetic pole P. A thin wall portion 52 may be provided.

  Further, even if the thin portion 52 is formed in the magnetic pole bridge portion 47, when the resin injected into the magnet insertion hole 31 is prevented from flowing into the magnetic flux limiting hole 32, it is adjacent to the thin portion 52. In addition, it is preferable that the dam portion 11 is provided. As shown by the solid line in the thin-walled portion 52 shown by hatching, the dam portion 11 connects the general portions 51 around the thin-walled portion 52 and intersects the direction connecting the magnetic flux limiting hole portion 42 and the magnet hole portion 41. It is formed so as to extend along the direction.

  8, the dam portion 11 includes a magnetic flux restricting hole 42 (in the form of FIG. 5, the outer peripheral edge 40 a), a magnet hole 41, and the like, in the same manner as described above with reference to FIG. 5. The form currently formed in the middle position of the direction which connects is illustrated. That is, the intermediate position in the direction connecting the side where the resin is not desired to flow out (the side of the magnetic flux limiting hole 42 in the embodiment of FIG. 8 and the side of the outer peripheral edge 40a in the embodiment of FIG. 5) and the magnet hole 41. The form in which the weir part 11 is formed is illustrated.

  Although not shown, in the form shown in FIG. 8 as well, in the same manner as the form described above with reference to FIG. 4, the magnetic flux limiting hole 42 side with respect to the thin part 52 (in the form shown in FIG. The dam portion 11 may be formed on the other side. Moreover, the dam part 11 may be formed in the magnet hole part 41 side with respect to the thin part 52 similarly to the form mentioned above with reference to FIG. In addition, although illustration in FIG. 8 is abbreviate | omitted, as above-mentioned with reference to FIG.4, FIG.6, FIG.7, you may provide the groove part 12 in the dam part 11 suitably.

  In the form shown in FIG. 9, the three permanent magnets 35 arranged in the circumferential direction C are arranged so as to be U-shaped so as to protrude toward the side opposite to the stator 2 side (radially inner side R <b> 2). Thus, one magnetic pole P is configured. In this case, in each magnetic pole P, there are two bridge portions (inter-magnet bridge portions 45) formed between the permanent magnets 35 (magnet hole portions 41). Thin portions 52 may be formed in the two inter-magnet bridge portions 45, respectively. Since the weir part 11 and the groove part 12 are the same as the various forms described above, description thereof is omitted.

  Further, as shown in FIG. 10, the same applies to the case where the permanent magnet 35 and the magnetic flux restriction hole 32 are more complicatedly arranged in one magnetic pole P. Similar to the embodiment described above with reference to FIG. 8, not only the outer peripheral bridge portion 44 but also a bridge between the permanent magnet 35 (magnet hole portion 41) and the magnetic flux limiting hole portion 42 constituting each magnetic pole P. The thin portion 52 can also be provided in the portion (the bridge portion 47 in the magnetic pole). Moreover, the dam part 11 can also be provided adjacent to the thin part 52 similarly to the various forms mentioned above. Further, the dam portion 11 can be appropriately provided with a groove portion 12. Since these are the same as the above-mentioned various forms, detailed description is abbreviate | omitted.

[Other Embodiments]
Hereinafter, other embodiments will be described. The configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction occurs.

(1) In the above description, the configuration in which the plurality of electromagnetic steel plates 40 are formed in the same shape has been described as an example. However, the thin-walled portion 52 may be formed only in the electromagnetic steel sheet 40 in a partial region in the axial direction L (for example, a central region in the axial direction L) without being limited to such a configuration. That is, the thin-walled portion 52 may be formed in some of the electromagnetic steel plates 40 that constitute the rotor core 30. And the dam part 11 is provided adjacent to the said thin part 52, and the groove part 12 may be provided in the dam part 11 suitably.

(2) In the above, the form which forms the thin part 52 in one surface of the axial direction L of the electromagnetic steel plate 40 was illustrated. However, without being limited to such a configuration, for example, the thin-walled portions 52 may be formed on both surfaces of the electromagnetic steel sheet 40 in the axial direction L. And the dam part 11 is provided adjacent to the said thin part 52, and the groove part 12 may be provided in the dam part 11 suitably.

(3) In the above, the form in which the thin portion 52 is formed by press working is exemplified. However, the thin-walled portion 52 may be formed by performing chemical processing such as cutting or etching on the electromagnetic steel sheet 40 without being limited to press working.

[Outline of Embodiment]
The outline of the rotating electrical machine rotor (3) described above will be briefly described below.

  As one aspect, a rotor core (30) formed by laminating a plurality of annular plate-shaped electromagnetic steel plates (40) in the axial direction (L), and a magnet hole (41) of the electromagnetic steel plate (40) Includes a permanent magnet (35) arranged in a magnet insertion hole (31) formed in the rotor core (30) in a row in the axial direction (L), and the magnet insertion hole (31) is filled with resin. In the rotating electrical machine rotor (3), at least a part of the electromagnetic steel sheet (40) has a thin part (52) whose plate thickness along the axial direction (L) is thinner than the general part (51). , Formed between the magnet hole (41) and the outer peripheral edge (40a) of the electromagnetic steel plate (40), connecting the general part (51) around the thin part (52), and for the magnet It extends along the direction intersecting the direction connecting the hole (41) and the outer peripheral edge (40a). The general portion (51) and the same thickness of the weir (11) is formed adjacent to the thin portion (52).

  When configuring the rotor (3) for the rotating electrical machine, the rotor core (30) and the permanent magnet (35) are fixed by filling the magnet insertion hole (31) with resin. When the thin wall portion (52) is formed between the outer peripheral edge (40a) of the electromagnetic steel sheet (40) and the magnet hole (41), the radial direction (R) extends from the magnet insertion hole (31). An opening is generated in the outer peripheral surface (30a) of the rotor core (30). And resin may leak from this opening. However, by providing the weir part (11) as described above, the resin from the magnet insertion hole (31) toward the outer peripheral surface (30a) of the rotor core (30) along the radial direction (R) is blocked. Therefore, it is possible to prevent the resin from leaking to the outer peripheral surface (30a) of the rotor core (30). That is, according to this configuration, when the resin is filled in the hole (31) in which the permanent magnet (35) of the rotor core (30) is disposed, the leakage of the resin to the outside of the rotor core (30) can be suppressed. .

  Here, the said dam part (11) is radial direction (R) so that the side of the said hole part (41) for magnets and the side of the said outer periphery (40a) may be connected with respect to the said dam part (11). It is preferable to have a groove (12) formed along the line.

  Since the thickness of the weir part (11) in the axial direction (L) is the same as that of the general part (51), the weir part (11) has another electromagnetic steel plate (40) adjacent to the axial direction (L). In close contact. For this reason, the space surrounded by the thin wall portion (52), the other electromagnetic steel plate (40) adjacent to the axial direction (L), and the weir portion (11) is opened in the direction of the magnet insertion hole (31). However, the outer peripheral edge (40a) side is a closed space. The resin is supplied from the magnet insertion hole (31) side, but the resin does not sufficiently enter due to the pressure of the air present in the space closed by the weir part (11), and the thin part (52) and the axial direction There is a possibility that so-called voids may be generated without being filled with resin between the electrical steel sheet (40) adjacent to (L). According to this configuration, since the groove portion (12) can remove air from the closed space as described above, the pressure of the air existing in the space can be reduced and the resin can be appropriately filled. . In addition, it is sufficient for the groove part (12) to ensure a size capable of removing air. Therefore, if the resin having a viscosity much higher than that of air is a groove (12) having a size that does not escape from the rotor core (30) due to the injection pressure of the resin, the resin to the outside of the rotor core (30) Generation of voids can be suppressed while suppressing leakage.

  Various forms of the weir portion (11) can be considered. As one aspect, it is preferable that the dam portion (11) is formed on the outer peripheral edge (40a) side with respect to the thin portion (52).

  According to this structure, since the area of the thin part (52) with which resin is filled can be taken widely, the electromagnetic steel plates (40) adjacent to an axial direction (L) can also be firmly fixed with resin. .

  As another aspect, the dam portion (11) may be formed on the magnet hole (41) side with respect to the thin portion (52).

  According to this configuration, the space surrounded by the thin wall portion (52), the other electromagnetic steel plate (40) adjacent in the axial direction (L), and the weir portion (11) is formed on the outer peripheral surface of the rotor core (30). Since it opens, the surface area of the outer peripheral surface (30a) of a rotor core (30) can be enlarged. Therefore, the cooling performance of the rotor (3) for the rotating electrical machine can be enhanced. Moreover, the space surrounded by the thin wall portion (52), the other electromagnetic steel plate (40) adjacent to the axial direction (L), and the weir portion (11) does not open to the magnet insertion hole (31) side. The space is not filled with a resin, and so-called voids can be avoided.

  Moreover, as another aspect, the said dam part (11) is formed in the intermediate position of the direction which connects the said outer periphery (40a) and the said hole part for magnets (41) in the said thin part (52). Also good.

  According to this structure, since the thin part (52) is arrange | positioned at both sides of radial direction (R) with respect to a dam part (11), it is thin on one side of radial direction (R) with respect to a dam part (11). Compared with the case where the portion (52) is arranged, the unevenness of the residual stress when the thin portion (52) is formed can be reduced. Therefore, deformation of the electrical steel sheet (40) due to such residual stress can be suppressed to a small extent. Moreover, although an area becomes small compared with the form which provides a thin part (52) in the outer peripheral edge (40a) side with respect to a thin part (52), axial direction ( The magnetic steel plates 40 adjacent to L) can also be firmly fixed.

  Moreover, as one aspect, the dam portion (11) has a diameter so that the magnet hole (41) side and the outer peripheral edge (40a) side communicate with the dam portion (11). When it has the groove part (12) formed along the direction (R), the outer peripheral side boundary (52a) which is a boundary of the thin part (52) on the outer peripheral edge (40a) side is the outer peripheral edge ( 40a) has a convex arc shape, the weir portion (11) is formed along the outer peripheral side boundary (52a), and the groove portion (12) is the most in the outer peripheral side boundary (52a). It is preferable to be formed at a position close to the outer peripheral edge (40a).

  According to this configuration, since the width of the dam portion (11) in the radial direction (R) can be relatively large, the strength of the dam portion (11) can be increased. Moreover, since an outer peripheral side boundary (52a) is an arc shape convex toward the outer periphery (40a), the thin-walled part (52) and another electromagnetic steel sheet (40) adjacent in the axial direction (L), Corners are unlikely to occur in the space surrounded by the weir part (11). In addition, the groove portion (12) is formed at a position where the distance between the thin portion (52) and the outer peripheral edge (40a) is the shortest. Therefore, air can be appropriately extracted from the space through a short path, and a region in which the resin is not filled can be made difficult to occur. Therefore, it is possible to avoid so-called voids in the space.

  In addition, it is preferable that the thin wall portion (52) is formed in a bridge portion (44) disposed closer to the outer peripheral edge (40a) than the magnet hole portion (41).

  The bridge portion (44) disposed closer to the outer peripheral edge (40a) than the magnet hole portion (41) is different from the magnetic path in one magnetic pole (P) in the rotor (3) for the rotating electrical machine. The magnetic path between (P) is connected in the circumferential direction (C). By forming the thin part (52) in the bridge part (44) and making the plate thickness thinner than the general part (51), the magnetic path cross-sectional area can be reduced and the magnetic resistance can be increased. This makes it difficult for the magnetic flux passing through the bridge portion (44) to flow, so that short-circuiting of the magnetic flux of the permanent magnet (35) can be suppressed.

  Further, as one aspect, the electromagnetic steel plate (40) has a magnetic flux limiting hole (42) different from the magnet hole (41), and the thin-walled portion (52) is used for the magnetic flux limiting. It is also formed between the hole (42) and the magnet hole (41), and the weir (11) is formed between the magnetic flux limiting hole (42) and the magnet hole (41). In the thin wall portion (52), the general portion (51) around the thin wall portion (52) is connected, and the magnetic flux limiting hole portion (42) and the magnet hole portion (41) are connected. It is preferable that it is formed so as to extend along a direction intersecting the direction.

  According to this configuration, the magnetic resistance is increased without widening the magnetic flux limiting hole (42) by the thin-walled part (52) between the magnetic flux limiting hole (42) and the magnet hole (41). can do. That is, while suppressing a decrease in strength of the electromagnetic steel sheet (40) and the rotor core (30), it is possible to increase the magnetic resistance and suppress a short circuit of the magnetic flux of the permanent magnet (35). Further, although there is a case where it is not desired to allow the resin to flow into the magnetic flux limiting hole (42), according to this configuration, the thin wall portion between the magnetic flux limiting hole (42) and the magnet hole (41). By providing the weir portion (11) in (52), it is possible to suppress the inflow of resin into the magnetic flux limiting hole portion (42).

3: Rotor (rotor for rotating electrical machine)
DESCRIPTION OF SYMBOLS 11: Weir part 12: Groove part 30: Rotor core 30a: Outer peripheral surface 31: Magnet insertion hole 35: Permanent magnet 40: Electromagnetic steel plate 40a: Outer peripheral edge 41: Magnet hole part 42: Magnetic flux restriction hole part 44: Outer peripheral side bridge part (Bridge part arranged on the outer periphery side of the hole for magnet)
47: Bridge portion 51 in the magnetic pole: General portion 52: Thin portion 52a: Outer peripheral side boundary C: Circumferential direction L: Axial direction R: Radial direction R1: Radial outer side R2: Radial inner side

Claims (8)

A rotor core formed by laminating a plurality of annular plate-shaped electromagnetic steel plates in the axial direction, and a magnet hole of the electromagnetic steel plate are arranged in a magnet insertion hole formed in the rotor core in the axial direction. A rotor for a rotating electrical machine comprising a permanent magnet, wherein the magnet insertion hole is filled with resin,
At least a part of the electromagnetic steel sheet is formed between the magnet hole and the outer peripheral edge of the electromagnetic steel sheet, with a thin part having a thickness smaller than the general part along the axial direction,
The general portion around the thin portion is connected, and extends along a direction intersecting the direction connecting the magnet hole and the outer peripheral edge, and the weir portion having the same plate thickness as the general portion is the thin portion. A rotor for a rotating electrical machine formed adjacent to a portion.   2. The rotating electrical machine according to claim 1, wherein the dam part has a groove part formed along a radial direction so as to communicate the magnet hole part side and the outer peripheral edge side with respect to the dam part. Rotor.   The rotor for a rotating electrical machine according to claim 1, wherein the dam portion is formed on the outer peripheral edge side with respect to the thin portion.   The rotor for a rotating electrical machine according to claim 1, wherein the dam portion is formed on the magnet hole side with respect to the thin portion.   The rotor for a rotating electrical machine according to claim 1, wherein the dam portion is formed at an intermediate position in a direction connecting the outer peripheral edge and the magnet hole in the thin portion.   The thin-walled portion has an outer peripheral side boundary that is a boundary on the outer peripheral edge side, and has an arc shape that is convex toward the outer peripheral edge, the dam portion is formed along the outer peripheral side boundary, and the groove portion is The rotor for a rotating electrical machine according to claim 2, wherein the rotor is formed at a position closest to the outer peripheral edge at the outer peripheral side boundary.   The rotor for a rotating electrical machine according to any one of claims 1 to 6, wherein the thin portion is formed in a bridge portion that is disposed closer to the outer peripheral edge than the magnet hole. The electromagnetic steel sheet has a magnetic flux limiting hole different from the magnet hole,
The thin portion is also formed between the magnetic flux limiting hole and the magnet hole,
The dam part connects the general part around the thin part in the thin part between the magnetic flux restricting hole part and the magnet hole part, and the magnetic flux restricting hole part and the magnet hole The rotor for a rotating electrical machine according to any one of claims 1 to 7, wherein the rotor is formed so as to extend along a direction intersecting with a direction connecting the portions.

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