JP2017139921A - Rotator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotator of a rotary electric machine, capable of surely regulating the movement to an axial direction of a magnet piece, and efficiently reducing leakage of a magnetic flux to an end plate.SOLUTION: A large part of a side part (an axial direction side surface of a magnet piece 24) in which a flux leakage out of a beam part 28 of the side part (a length direction end surface of the magnet piece 24 as the axial direction side surface of the magnet piece 24) of the magnet piece 24 is supported by a supporting surface 40A of an end plate 22. Thereby the movement and jumping out of the magnet piece 24 are prevented, and the flux leakage is efficiently reduced in a gap 44 (the gap 44 formed by a low air amplitude permeability) of concave parts 42 formed at an opposite position of the axial direction side surface of the beam part 28. Thus, efficiency of a motor 10 is improved.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotor that is a rotor used in a rotating electric machine such as a motor or a generator, and relates to a rotor of a rotating electric machine that is suitable for application to an electric vehicle such as a hybrid vehicle or a fuel cell vehicle.

  In Patent Document 1, a cylindrical rotor core, a pole made of two magnet pieces respectively arranged in a V shape at a plurality of circumferential positions of the rotor core, and the rotor core are supported by both axial ends of the rotor core. A rotor of a rotating electrical machine including a pair of end plates made of a conductor such as copper is disclosed.

  On the side surface (main surface) in the axial direction of the end plate, an annular recess is provided at a position facing the entire surface of the end portions of the plurality of poles (magnet pieces), and a space (gap) is formed by the annular recess. Has been.

  It is described that this space portion makes it difficult to link the leakage magnetic flux from the rotor core to the end plate, thereby suppressing the generation of eddy currents in the end plate ([0020] of Patent Document 1).

JP 2009-232535 A (FIG. 1 to FIG. 4, summary)

  However, since the end plate disclosed in Patent Document 1 is provided with a space by an annular recess on the entire surface (entire circumference) of the opposing surface of the magnet piece, it is guaranteed that the end plate regulates the displacement of the magnet piece in the axial direction. For example, due to deterioration of the resin member that fixes the outer periphery of the magnet piece to the rotor core, there is a problem that the magnet piece moves in the axial direction during rotation of the rotor, and there is room for improvement.

  The present invention has been made in consideration of such problems, and can reliably restrict the movement of the magnet pieces in the axial direction and effectively reduce the leakage of magnetic flux to the end plate. An object of the present invention is to provide a rotor for a rotating electrical machine.

  A rotor of a rotating electrical machine according to the present invention includes a cylindrical rotor core, a non-magnetic end plate that supports the rotor core at an axial end portion of the rotor core, and at least a plurality of circumferential positions of the rotor core. In a rotor of a rotating electrical machine having a pole made of two rectangular parallelepiped magnet pieces, the rotor core has a beam portion positioned between the magnet pieces in the pole, and the end plate is at least partially Is configured to support the magnet piece, and at least a recess is formed on a surface facing the axial side surface of the beam portion, and a gap is formed between the beam side and the axial side surface. .

  2. Description of the Related Art Conventionally, a technique for increasing torque while securing the strength of the rotor core is known by dividing the pole into two magnet pieces and arranging them in a V shape at a plurality of locations in the circumferential direction of the rotor core.

  However, when the two magnet pieces are arranged in a V shape, the magnetic flux is concentrated on the beam portion at the center end portion of the V shape, and magnetic flux saturation is likely to occur, and magnetic flux leakage from the beam portion to the end plate occurs. This increases the amount of loss caused by eddy currents in the end plate.

  On the other hand, the magnet piece itself has a low magnetic permeability, and the magnetic flux easily flows to the rotor core having a high magnetic permeability, so that the magnetic flux leakage to the end plate is small.

  Therefore, in the present invention, the axial direction of the magnet piece is supported by supporting at least a part (a part or all) of the axial side surface with less magnetic flux leakage except for the beam portion by the end plate in the axial side surface of the magnet piece. The magnetic flux leakage is effectively and effectively reduced by the air gap (the air gap due to the low permeability) of the end plate formed at the position opposite the axial side surface of the beam while As a result, the efficiency of the rotating electrical machine is improved.

  Further, the surface on the end plate facing the side surface in the axial direction of the beam portion is not a through hole but a recess gap, so that even if a fragment of the fixing member of the magnet piece is generated, it fits in the recess gap. Therefore, it is possible to prevent a failure of the rotating electrical machine due to the fragments.

  In this case, you may form the said recessed part of the surface facing the axial direction side surface of the said beam part of the said end plate in an annular groove. By forming the concave portion of the end plate that supports the magnet piece from the axial side surface in the annular groove, the concave portion can be easily processed by pressing or cutting, and the cost can be reduced.

  Here, the inner diameter of the concave portion of the annular groove is shorter than the radius of a circle passing through the inner corner of the magnet piece forming the beam portion, and the outer diameter of the concave portion of the annular groove is the beam It is preferable that the length of the radius of the circle passing through the outer corner of the magnet piece forming the portion is longer. Since the annular gap covers the entire axial side surface of the beam portion, magnetic flux leakage to the end plate can be further reduced.

  In addition, the said recessed part is good also as a hollow cylindrical shape with a bottom. By forming a hollow cylindrical recess with a bottom, the gap becomes a minimum necessary, the rigidity of the end plate is increased, and the plate thickness of the end plate can be reduced. Also, cutting is easy and the cost can be reduced.

  Here, it is preferable that the circular opening of the hollow cylindrical recess having a bottom has a size covering the beam portion. Since the gap covers the entire beam portion, magnetic flux leakage can be reduced.

  The rotor of the rotating electrical machine according to the present invention is arranged at a cylindrical rotor core, a nonmagnetic end plate that supports the rotor core at an axial end portion of the rotor core, and a plurality of locations in the circumferential direction of the rotor core. The rotor core has a beam portion positioned between the magnet pieces in the pole, and the end plate includes at least two poles made of at least two rectangular parallelepiped magnet pieces. A part thereof supports the magnet piece, and an opening is formed on a surface facing the axial side surface of the beam portion.

  According to this configuration, since the surface of the end plate facing the axial side surface of the beam portion on the rotor core is an opening (through hole), the leakage magnetic flux can be further reduced. Since the opening may have a size close to a necessary minimum, the rigidity of the end plate can be increased and the thickness of the end plate can be reduced.

  The opening is a hollow cylindrical opening, and the hollow cylindrical opening is sized to cover the axial side surface of the beam portion, so that the opening covers the entire axial side surface of the beam portion. Can be reduced.

  Furthermore, even if a fragment of the fixing member of the magnet piece occurs by closing the opening of the end plate with a low magnetic permeability sealing material, the fragment does not jump out of the end plate, causing the fragment. Failure of the rotating electric machine can be prevented.

  According to this invention, at least a part (part or all) of the axial side surface with less magnetic flux leakage excluding the beam portion in the axial side surface of the magnet piece is supported by the end plate, thereby the axis of the magnet piece. The magnetic flux leakage is effectively reduced by the air gap (the air gap by the low permeability) formed by the concave portion of the end plate formed at the opposite position of the axial side surface of the beam portion. be able to.

It is a partially omitted sectional view of a motor as a rotating electrical machine in which a rotor as a rotor according to this embodiment is incorporated. FIG. 2 is a partially cutaway view of a surface of the rotor shown in FIG. 1 that faces an end plate of a rotor core. FIG. 3 is a partially cutaway view of an end plate facing a partially cutout of the rotor core shown in FIG. 2. FIG. 4 is a partially omitted cross-sectional enlarged view showing a cross section taken along line IV-IV of the rotor core shown in FIG. 2. FIG. 5A is a partially cutaway view of an end plate that supports a rotor core of a rotor according to a modification of the embodiment. 5B is a partially omitted cross-sectional view showing a cross section taken along line VB-VB of the end plate shown in FIG. 5A. It is a partially cutaway view of a surface facing an end plate of a rotor core in a rotor according to a modification of the embodiment. It is a partially cutaway view of the surface facing the end plate of the rotor core in the rotor according to another embodiment. FIG. 8 is a partially cutaway view of an end plate facing a partially cutout of the rotor core shown in FIG. 7. It is explanatory drawing which shows the ratio of the amount of magnetic flux leaks from a rotor core to the end plate which does not have a recessed part and an opening, the end plate which has an opening, and the end plate which has a recessed part. It is a partially cutaway view of a surface facing an end plate of a rotor core in a rotor according to a modification of another embodiment. It is a partially cutaway view of an end plate that supports a rotor core of a rotor according to a modification of another embodiment.

  Hereinafter, preferred embodiments of a rotor of a rotating electrical machine according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a partially omitted cross-sectional configuration of a motor 10 as a rotating electrical machine in which a rotor 12 as a rotor according to this embodiment is incorporated.

  The motor 10 includes a stator 14 as a stator fixed to a housing (not shown), and a rotor 12 disposed inside the stator 14 with a gap 18 therebetween.

  The rotor 12 includes a rotating shaft 16 that is rotatably supported with respect to the housing (not shown), and a cylindrical rotor core 20 in which magnetic steel plates are laminated and magnet pieces 24 are embedded and fixed in the laminated magnetic steel plates. And a pair of end plates 22 made of a nonmagnetic material such as copper or aluminum that supports the axial side surface of the rotor core 20, and a collar 25 that supports one end plate 22.

  The rotor 12 is inserted into the rotating shaft 16 in this order from the right side in FIG. 1 to the other end plate 22, the rotor core 20, the one end plate 22, and the collar 25, and fixed to the rotating shaft 16.

  FIG. 2 shows a partially cut-away configuration of the surface of the rotor core 20 that faces the end plate 22.

  FIG. 3 shows a partially cutaway configuration of the end plate 22 that faces the partially cutaway configuration of the rotor core 20 of FIG.

  FIG. 4 shows a partially omitted cross-sectional enlarged configuration including a cross-sectional configuration taken along line IV-IV of the rotor core 20 of FIG.

  As shown in FIG. 2, a plurality of poles 26 (S poles or N poles) made of three magnet pieces 24 (24a, 24b, 24c) arranged in a so-called V shape are embedded in the rotor core 20 in the circumferential direction. It is. The poles 26 may have a configuration in which two or more rectangular parallelepiped magnet pieces 24 are arranged in a V shape instead of three.

  Between the central magnet piece 24a in the pole 26 of the rotor core 20 and the magnet piece 24b on one side and between the central magnet piece 24a and the magnet piece 24c on the other side, laminated magnetic steel sheets are used. The beam portion 28 is formed.

  On the outer periphery in the length direction of the magnet piece 24 of the rotor core 20 in which the magnet piece 24 is embedded (in FIG. 2, the direction orthogonal to the paper surface and the same as the axial direction), an embedding opening that is a through hole including the flux barrier 30 is provided. 32 is formed. The magnet pieces 24 are respectively inserted into the embedding openings 32, and the resin material 36 is filled and solidified in the gaps of the embedding openings 32 of the magnet pieces 24, so that the solidified resin material 36 as a fixing member is interposed. The magnet piece 24 is fixed to the rotor core 20.

  As shown in FIG. 3 and FIG. 4, the axial side surface (appearing surface) 40 of both end plates 22 facing the rotor core 20 in the axial direction appears on the axial side surface of the beam portion 28 formed on the rotor core 20 (shown in FIG. 2). A hollow cylindrical concave portion 42 (also referred to as a bottomed concave portion 42 for convenience of understanding) is provided at a position opposite to the beam surface, hereinafter also referred to as a beam portion 28 for convenience. It is configured to have a gap 44 between the portion 28.

  In FIG. 2, a circle drawn by a two-dot chain line so as to surround each beam portion 28 is a circumference that is a contact portion of the edge of the concave portion 42 provided on the end plate 22 with the side surface in the axial direction of the rotor core 20. 46 is shown schematically.

  That is, the circle having the circumference 46 of the hollow cylindrical recess 42 provided in the end plate 22 is sized to cover the side surface in the axial direction of the beam portion 28. The recess 42 may have a hollow rectangular parallelepiped shape or a hollow hemispherical shape in addition to the hollow cylindrical shape.

  Of the opposed surface 40 of the magnet piece 24 of the rotor core 20 of the end plate 22, the surface excluding the recess 42 (referred to as a support surface 40 </ b> A) is in contact with the side portion (end surface in the length direction) of the magnet piece 24. And the rotor core 20 are supported.

  In this way, by supporting the side portion (side surface in the axial direction of the magnet piece 24) with less leakage magnetic flux except for the beam portion 28 on the side portion of the magnet piece 24 by the support surface 40A of the end plate 22, the magnet piece 24 is supported. The magnetic flux leakage from the beam portion 28 can be efficiently reduced by the gap 44 formed by the concave portion 42 formed at the opposite position of the side surface in the axial direction of the beam portion 28 while preventing the movement and jumping out of the beam portion 28 in the axial direction. Thereby, the efficiency of the motor 10 as the rotating electrical machine can be improved.

[Summary and Modifications of Embodiments and Other Embodiments and Modifications]
The rotor 12 of the motor 10 according to the embodiment includes a cylindrical rotor core 20, a non-magnetic end plate 22 that supports the rotor core 20 at an axial end portion of the rotor core 20, and a plurality of circumferential positions of the rotor core 20. And a pole 26 made of a magnet piece 24 (24a, 24b, 24c).

  The rotor core 20 has a beam portion 28 (FIGS. 2 and 4) located between the magnet pieces 24 a, 24 b and 24 c in the pole 26.

  The end plate 22 is at least partially, as shown in FIGS. 2 and 3, in this embodiment, most of the support surface 40A supports the magnet pieces 24 (24a, 24b, 24c), and at least the beam. A bottomed recess 42 is formed on a surface 40 opposite to the axial side surface of the portion 28, and a gap 44 (FIG. 4) is formed between the beam portion 28 and the axial side surface.

  As shown in FIG. 2, when the pole 26 is divided into three magnet pieces 24a, 24b, 24c and arranged in a V shape, the magnetic flux is a beam 28 between the magnet pieces 24a, 24b and the magnet pieces 24a, Concentrating on the beam portion 28 between 24c, magnetic saturation is likely to occur, and when the concave portion 42 is not provided, the leakage magnetic flux from the beam portion 28 to the end plate 22 side increases.

  On the other hand, the magnet pieces 24a, 24b, 24c themselves have a low magnetic permeability, and the magnetic flux tends to flow to the rotor core 20 with a high magnetic permeability, so that the end plate from the end face in the length direction that is the side of the magnet pieces 24a, 24b, 24c. There is little leakage magnetic flux to 22 side.

  Therefore, in the embodiment, the side portion (the axis of the magnet piece 24) with less magnetic flux leakage excluding the beam portion 28 on the side portion of the magnet piece 24 (the end surface in the length direction of the magnet piece 24 which is the side surface in the axial direction of the magnet piece 24). Most of the direction side surface is supported by the support surface 40A of the end plate 22 so that the magnet piece 24 is formed at a position opposite to the axial side surface of the beam portion 28 while preventing the magnet piece 24 from moving to and protruding from the axial direction side portion. The air gap 44 by the concave portion 42 (the air gap 44 by air having a low magnetic permeability) efficiently reduces magnetic flux leakage and thus improves the efficiency of the motor 10.

  Further, the surface 40 on the end plate 22 facing the side surface in the axial direction of the beam portion 28 is not a through hole, but a gap 44 including a bottomed recess 42, so that a fixing member (here, a resin material) of the magnet piece 24 is formed. Even if the fragments of 36) are generated, they fall within the gaps 44 of the recesses 42, so that the failure of the motor 10 caused by the fragments can be prevented.

  In this case, since the concave portion 42 provided in the end plate 22 has a hollow cylindrical shape, it becomes a gap 44 having a circumference 46 as a peripheral edge that is close to the minimum necessary, and the rigidity of the end plate 22 is higher than that of the prior art. As a result, the thickness of the end plate 22 can be reduced.

  In this case, since the circle (circle) formed by the circumference 46 of the hollow cylindrical recess 42 is sized to cover the axial side surface of the beam portion 28, the entire axial side surface of the beam portion 28 is covered with the gap 44. This reduces magnetic flux leakage.

  It should be noted that the magnetic flux leakage amount from the rotor core 20 due to the provision of the hollow cylindrical recess 42 is approximately 80 [%], where the magnet leakage from the rotor core where the recess 42 is not provided in the end plate 22 is 100 [%]. It is confirmed by simulation that it can be reduced to a certain extent.

<Modification of Embodiment>
As shown in FIG. 5A and FIG. 5B, which is a cross-sectional view taken along the line VB-VB, in the rotor 12 </ b> A (an overall view is not shown) of the modified example of the embodiment, the end plate 22 </ b> A that supports the axial side surface of the magnet piece 24. The concave portion 47 of the surface 40 facing the axial side surface of the beam portion 28 of the rotor core 20 is not a hollow cylindrical shape, but is a concave portion 47 of an annular groove, and a gap 44A composed of the concave portion 47 of the annular groove is formed. .

  Thus, by forming the concave portion 47 of the end plate 22A that supports the magnet piece 24 from the side portion in the annular groove, the concave portion 47 (annular groove) can be easily processed by pressing or cutting, and the cost is reduced. be able to.

  FIG. 6 shows a partially cut-out configuration of a surface facing the end plate 22A of the rotor core 20 constituting the rotor 12A of the modified example. In FIG. 6, two circumferences drawn by a two-dot chain line so as to surround the beam portion 28 are recessed portions 47 (FIG. 5A, which are in contact with the axial side surface of the rotor core 20 of the annular groove provided in the end plate 22A. FIG. 5B) schematically shows the circumferences 51 and 52 of the groove edge.

  The radius (inner diameter) of the circle having the circumference 51 of the recess 47 is the radius of the circle passing through the inner corner portion 54 of the magnet piece 24 constituting the beam portion 28 (in this example of FIG. 6, the inner corner portion 54 of the magnet piece 24a). The radius (outer diameter) of the circle having the circumference 52 of the recess 47 and the radius (outer diameter) of the concave portion 47 is shorter than the length of the circle passing through the outer corner portion 56 of the magnet piece 24 (this figure). In the six examples, the length is longer than the length of the radius passing through the outer corner portion 56 of the magnet piece 24a.

  With this configuration, the radius (inner diameter) of the circle having the circumference 51 of the concave portion 47 is set so as to prevent the magnet piece 24a from moving in the axial direction as much as possible in the radial direction of the rotor 12A of the magnet piece 24a. Since it becomes longer than the length of the radius of the circle passing through the inner end, the axial direction of the magnet piece 24 is supported by the support surface 40A that abuts the magnet piece 24 in the surface 40 facing the axial side surface of the rotor core 20 of the end plate 22A. It is possible to prevent movement and jumping out to the side.

  In the end plate 22A configured in this manner, the gap 44A covers the entire side surface in the axial direction of the beam portion 28, so that leakage of magnetic flux to the end plate 22A can be reduced.

<Other embodiments>
As shown in FIGS. 7 and 8, in the rotor 12 </ b> B of another embodiment, the surface 40 of the end plate 22 </ b> B that supports the axial side surface of the magnet piece 24 that faces the axial side surface of the beam portion 28 of the rotor core 20. The concave portion is not a hollow cylindrical shape, but is a flat hollow substantially rectangular parallelepiped through-hole opening 58 having an oblong shape with a flat cross section.

  FIG. 1 shows a partially omitted cross-sectional configuration of a motor 10 as a rotating electrical machine in which a rotor 12B including a rotor core 20 supported by an end plate 22B is incorporated.

  The rotor 12 </ b> B according to another embodiment is disposed at a cylindrical rotor core 20, a non-magnetic end plate 22 </ b> B that supports the rotor core 20 at an axial end of the rotor core 20, and a plurality of locations in the circumferential direction of the rotor core 20. And at least two poles (FIG. 7) composed of three rectangular parallelepiped magnet pieces 24a, 24b, and 24c.

  Also in the rotor 12B of this other embodiment, the rotor core 20 has the magnet piece 24a and the magnet piece 24b in the pole 26, and the beam part 28 (FIG. 7) located between the magnet piece 24a and the magnet piece 24c.

  As shown in FIG. 8, the end plate 22B is a flat surface having four rounded corners on the surface 40 facing the axial side surface of the rotor core 20 and on the surface facing the axial side surface of the beam portion 28 (FIG. 7). A hollow rectangular parallelepiped opening (through hole) 58 is formed. The surface excluding the opening 58 of the end plate 22B is a support surface 40B that abuts and supports the side of the magnet piece 24 of the rotor core 20.

  In FIG. 7, an ellipse drawn with a two-dot chain line so as to surround each beam portion 28 is a peripheral edge that is a contact portion of the opening edge of the opening 58 provided in the end plate 22 </ b> B with the side surface in the axial direction of the rotor core 20. 60 is schematically shown.

  In the rotor 12A according to another embodiment, the surface of the end plate 22B that faces the side surface in the axial direction of the beam portion 28 on the rotor core 20 is the opening 58, so that the leakage magnetic flux from the rotor core 20 can be further reduced.

  As shown in FIG. 9, the amount of magnetic flux leakage (leakage magnetic flux) from the rotor core 20 when the hollow cylindrical bottomed concave portion 42 is provided is the rotor core in which neither the concave portion 42 nor the opening 58 is provided in the end plate 22. As a result of simulation, it can be reduced to about 60 [%] by providing the opening 58 as a through hole, while the amount of magnet leakage from the magnet can be reduced to about 80 [%]. I have confirmed.

<Modification of other embodiment>
As shown in FIGS. 10 and 11, in the rotor 12 </ b> C of the modified example of the other embodiment, the end plate 22 </ b> C that supports the axial side surface of the magnet piece 24 faces the axial side surface of the beam portion 28 of the rotor core 20. The concave portion of the surface 40 is formed not in the flat hollow substantially rectangular parallelepiped through-hole opening 58 but in the hollow cylindrical through-hole opening 62.

  FIG. 1 shows a partially omitted cross-sectional configuration of a motor 10 as a rotating electrical machine in which a rotor 12C including a rotor core 20 supported by an end plate 22C is incorporated.

  Thus, by forming the opening 62 of the end plate 22C that supports the magnet piece 24 from the side in the shape of a hollow cylinder, the opening 62 can be easily processed by pressing or cutting, and the cost can be reduced. .

  FIG. 10 shows a partially cut-away configuration of the surface of the rotor core 20 that faces the end plate 22C.

  In FIG. 10, two circles drawn by a two-dot chain line so as to surround the beam portion 28 formed between the magnet piece 24a and the magnet piece 24b and between the magnet piece 24a and the magnet piece 24c are provided on the end plate 22C. The circumference 64 of the opening edge where the opening 62 abuts against the axial side surface of the rotor core 20 is schematically shown.

  The circumference 64 of the hollow cylindrical opening 62 has a size covering the axial side surface of the beam portion 28. Thus, since the opening 62 covers the entire axial side surface of the beam portion 28, magnetic flux leakage can be reduced.

  Note that it is preferable to close the opening 58 (FIG. 8) and the opening 62 (FIG. 11) with a sealing material such as a low magnetic permeability resin agent or rubber.

  Even if a broken piece of the fixing member of the magnet piece 24 is generated by closing the opening 58 of the end plate 22B and the opening 62 of the end plate 22C with a low-permeability sealing material, the broken pieces are separated from the end plates 22B and 22C. It is possible to prevent failure of the motor 10 caused by the fragments.

  The present invention is not limited to the above-described embodiment. For example, the axis of the beam portion 28 (FIG. 7) on the surface 40 facing the axial side surface of the rotor core 20 described with reference to FIGS. Instead of the end plate 22B (see FIG. 8) in which a flat hollow rectangular parallelepiped opening (through hole) 58 is formed on the surface facing the direction side surface, an elliptical peripheral edge 60 (FIG. 7) covering the beam portion 28. And a flat hollow rectangular parallelepiped bottomed concave portion (see FIG. 4) having rounded corners, and various other configurations are adopted based on the description in this specification. Of course you get.

DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine) 12 (12A, 12B, 12C) ... Rotor 14 ... Stator 20 ... Rotor core 22 (22A, 22B, 22C) ... End plate 24 (24a, 24b, 24c) ... Magnet piece 26 ... Pole 28 ... Beam part 40 ... Surface (opposite surface) 40A, 40B ... Support surface 42, 47 ... Recess 44, 44A ... Cavity 46, 51, 52, 64 ... Perimeter 54 ... Inner corner 56 ... Outer corner 58,62 ... Opening 60 ... Rim

Claims (9)

A cylindrical rotor core;
A non-magnetic end plate that supports the rotor core at an axial end of the rotor core;
A pole composed of at least two rectangular magnet pieces arranged at a plurality of locations in the circumferential direction of the rotor core;
In the rotor of the rotating electrical machine having
The rotor core has a beam portion located between the magnet pieces in the pole,
The end plate is
At least a portion supports the magnet piece, and at least a concave portion is formed on a surface facing the axial side surface of the beam portion, and a gap is formed between the beam side and the axial side surface. A rotor of a rotating electrical machine that is characterized. In the rotor of the rotating electrical machine according to claim 1,
The rotor of the rotating electrical machine, wherein the concave portion of the surface of the end plate facing the axial side surface of the beam portion is formed in an annular groove. The rotor of the rotating electrical machine according to claim 2,
An inner diameter of the concave portion of the annular groove is shorter than a length of a radius of a circle passing through an inner corner of the magnet piece forming the beam portion,
An outer diameter of the concave portion of the annular groove is longer than a radius of a circle passing through an outer corner portion of the magnet piece forming the beam portion. In the rotor of the rotating electrical machine according to claim 1,
The concave portion has a bottomed hollow cylindrical shape. The rotor of the rotating electrical machine according to claim 4,
A rotor of a rotating electrical machine, wherein a circular opening of the hollow cylindrical recess having a bottom is sized to cover the beam portion. A cylindrical rotor core;
A non-magnetic end plate that supports the rotor core at an axial end of the rotor core;
A pole composed of at least two rectangular magnet pieces arranged at a plurality of locations in the circumferential direction of the rotor core;
In the rotor of the rotating electrical machine having
The rotor core has a beam portion located between the magnet pieces in the pole,
The end plate is
A rotor of a rotating electrical machine, wherein at least a part supports the magnet piece, and an opening is formed in a surface facing the axial side surface of the beam portion. The rotor of the rotating electrical machine according to claim 6,
The opening is a hollow cylindrical shape. A rotor of a rotating electrical machine. The rotor of the rotating electrical machine according to claim 7,
The rotor of the rotating electrical machine, wherein the hollow cylindrical opening has a size covering an axial side surface of the beam portion. In the rotor of the rotary electric machine according to any one of claims 6 to 8,
A rotor of a rotating electrical machine, wherein the opening is closed with a sealing material having a low magnetic permeability.

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