JP2019047645A - Axial gap type rotary electric machine - Google Patents

Abstract

To suppress a deformation of an enclosing portion enclosing a permanent magnet due to load caused by centrifugal force which acts on the permanent magnet.SOLUTION: A base member has a plurality of enclosing portions individually enclosing each of permanent magnets when viewed from an axial direction of a rotor, and each of the enclosing portions includes a first radial direction portion located on one side of a circumferential direction of the permanent magnets located inside and extending in the radial direction of the rotor, a second radial direction portion located on the other side in the circumferential direction of the permanent magnets and extending in the radial direction, and a circumferential direction portion located outside of the first radial direction portion and the second radial direction portion and connecting the first radial direction portion and the second radial direction portion. The circumferential direction portion has an inside surface opposing the permanent magnets in the radial direction, and the inside surface includes a central part in the circumferential direction in the inside surface, a non-contact surface located apart from the permanent magnets, a first contact surface located on one side in the circumferential direction of the non-contact surface and contacting the permanent magnets in the radial direction, and a second contact surface located on the other side in the circumferential direction of the non-contact surface and contacting the permanent magnets in the radial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an axial gap type rotating electrical machine, and more particularly to a rotor of an axial gap type rotating electrical machine.

  Conventionally, an axial gap type rotary electric machine is known as a kind of permanent magnet synchronous motor. An axial gap type rotating electric machine includes a rotor having a plurality of permanent magnets and a base member supporting these, and a stator having a plurality of coils, the rotor and the stator face each other with a gap in the axial direction of the rotor It is arranged to be.

  When the rotor rotates, centrifugal force acts on each of the plurality of permanent magnets. Therefore, a load due to a centrifugal force acting on the permanent magnet (a load due to the permanent magnet being pushed radially outward by the action of the centrifugal force) is applied to the base member that supports the plurality of permanent magnets.

  Here, the centrifugal force acting on each of the plurality of permanent magnets increases as the rotational speed of the rotor increases. Therefore, in order to rotate the rotor at high speed, it is necessary to make the base member bear the load.

  Patent Document 1 below discloses a base member provided with a high strength member as a surrounding portion individually surrounding each of the plurality of permanent magnets. In Patent Document 1 below, the load caused by the centrifugal force acting on the permanent magnet is shared as the tensile stress in the portion of the high strength member extending in the radial direction of the rotor, whereby the diameter of the high strength member is larger than that of the permanent magnet. The tensile stress generated in the circumferentially extending portion of the rotor outside the direction is reduced.

JP, 2006-174554, A

  However, even if the tensile stress generated in the portion extending in the circumferential direction of the rotor radially outside the permanent magnet among the high strength members is reduced, the deformation of the high strength member due to the load caused by the centrifugal force acting on the permanent magnet It turned out that it can not control.

  An object of the present invention is to suppress deformation of a surrounding portion surrounding a permanent magnet by exerting a load caused by a centrifugal force acting on the permanent magnet in a rotor of an axial gap type rotary electric machine.

  In order to achieve the above-mentioned purpose, the inventor of the present application investigated which part of the surrounding portion the stress is concentrated when the load caused by the centrifugal force acting on the permanent magnet is exerted. The stress concentrates at both end portions in the circumferential direction of the rotor among the portions to which the load caused by the centrifugal force acting on the permanent magnet is applied, and the dominant stress in this portion is bending stress. I came to get the knowledge that there is. The inventors of the present invention have made intensive studies on measures for reducing such bending stress and completed the present invention.

  The present invention is an axial gap type rotary electric machine, comprising: a rotor; and a stator disposed opposite to the rotor in the axial direction of the rotor to rotate the rotor by an electromagnetic force, the rotor comprising a plurality of rotors A permanent magnet, and a base member supporting the plurality of permanent magnets arranged in the circumferential direction of the rotor, the base member, when viewed from the axial direction of the rotor, supports each of the plurality of permanent magnets A plurality of encircling portions are provided, and each encircling portion is located on one side of the circumferential direction relative to a permanent magnet disposed inside the encircling portion, and a first radial direction extending in the radial direction of the rotor Portion, a second radial direction portion which is located on the other side of the circumferential direction with respect to the permanent magnet and extends in the radial direction, and the outer side in the radial direction than the first radial direction portion and the second radial direction portion Located in the first radial direction Portion and a circumferential direction portion connecting the second radial direction portion, the circumferential direction portion having an inner side surface facing the permanent magnet in the radial direction, the inner side surface being the inner side A side surface is formed in a region including the central portion in the circumferential direction, and a non-contact surface located away from the permanent magnet and one side of the non-contact surface in the circumferential direction, the radial direction It includes a first contact surface in contact with the permanent magnet, and a second contact surface located on the other side of the non-contact surface in the circumferential direction and in contact with the permanent magnet in the radial direction.

  In the axial gap type rotary electric machine, bending stress generated in each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion can be reduced. The reason is as follows.

  The bending stress is generated in each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion at the connection portion to the first radial direction portion of the circumferential direction portion and the second This is because a bending moment acts on each of the connecting portions to the radial direction. Here, the bending moment acting on the connecting portion is obtained by multiplying the magnitude of the load caused by the centrifugal force acting on the permanent magnet by the distance from the position to which the load is applied to the connecting portion. Therefore, if the magnitude of the load is the same, the bending moment acting on the connection portion can be reduced by shortening the distance from the position where the load is applied to the connection portion. That is, the bending stress generated in the connection portion can be reduced.

  In the axial gap type rotary electric machine, the load caused by the centrifugal force acting on the permanent magnet is not applied to the central portion in the circumferential direction in the circumferential direction. That is, the load caused by the centrifugal force acting on the permanent magnet can be applied as close as possible to each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion in the circumferential direction. . Therefore, the bending stress which generate | occur | produces in each of the connection part to the 1st radial direction part of a circumferential direction part, and the connection part to a 2nd radial direction part can be reduced.

  In the axial gap type rotating electric machine, preferably, the first radial direction portion has a first inner side surface in contact with one end of the permanent magnet in the circumferential direction, and the second radial direction portion is the permanent surface. The magnet has a second inner side in contact with the other end in the circumferential direction, and the inner side is an intermediate inner side in contact with a virtual circle centered on the rotation center of the rotor when viewed from the axial direction A first inner connecting surface that connects the middle inner side and the first inner side and is separated from the imaginary circle as it approaches the first inner side as viewed from the axial direction; and the middle inner side; The second inner side surface is connected, and the second inner side surface is further away from the imaginary circle as it approaches the second inner side surface as viewed in the axial direction, and the middle inner side surface is: The non-contact surface is included, and the first inner connection surface includes the first contact surface. It said second inner connection surface includes a second contact surface.

  In this case, for example, by making each of the first contact surface and the second contact surface on which the load caused by the centrifugal force acting on the permanent magnet is R-curved, the first radial direction portion of the circumferential direction portion The load resistance of each of the connecting portion to the second radial portion can be enhanced.

  In the axial gap type rotating electric machine, preferably, the non-contact surface is realized by the whole of the middle inner side surface.

  In this case, it is possible to further separate the position to which the load caused by the centrifugal force acting on the permanent magnet is applied from the circumferential center portion in the circumferential portion. Therefore, bending stress generated in each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion of the circumferential direction portion can be further reduced.

  In the axial gap type rotating electrical machine, preferably, the permanent magnet has an opposing surface which is spaced apart inward of the inner surface in the radial direction and which faces the inner surface in the radial direction. The non-contact surface is formed in a region of the inner side surface facing the opposing surface in the radial direction.

  In this case, it is not necessary to form a notch in the inner peripheral edge portion of the circumferential direction portion. Therefore, while securing the strength of the circumferential direction portion, the load caused by the centrifugal force acting on the permanent magnet is applied to each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion. It can be applied as close as possible.

  In the axial gap type rotary electric machine, preferably, the non-contact surface is formed on the outer side in the radial direction than the first contact surface and the second contact surface.

  In this case, it is not necessary to form a notch in the outer peripheral side edge of the permanent magnet, so the volume of the permanent magnet can be secured. As a result, the torque of the axial gap type rotary electric machine can be secured.

  In the axial gap type rotating electrical machine, preferably, of the plurality of surrounding portions, one of two surrounding portions adjacent in the circumferential direction has the first radial direction portion, and the other has the second radial direction portion having the other It has been realized. In this case, a plurality of enclosures can be handled together.

  According to the rotor of the axial gap type rotating electrical machine according to the present invention, bending stress generated in each of the connection portion to the first radial direction portion and the connection portion to the second radial direction portion of the circumferential direction portion can be reduced. .

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the axial gap type rotary electric machine by the 1st Embodiment of this invention. It is a disassembled perspective view of the axial gap type rotary electric machine shown in FIG. It is a top view which shows schematic structure of the rotor of the axial gap type rotary electric machine shown in FIG. It is a top view which expands and shows a part of FIG. It is explanatory drawing which shows the state which the surrounding member encloses the permanent magnet in which the notch is not formed. It is a beam model for demonstrating the load distribution of the circumferential direction part in the aspect shown in FIG. It is a beam model for demonstrating the load distribution of the circumferential direction part in the aspect shown in FIG. It is a top view expanding and showing a part of rotor of axial gap type rotation electrical machinery by application example 1 of a 1st embodiment of the present invention. It is a top view which shows schematic structure of the rotor of the axial gap type rotary electric machine by the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

  An axial gap type DC brushless motor 30 (hereinafter simply referred to as a motor 30) as an axial gap type rotating electrical machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the motor 30. As shown in FIG. FIG. 2 is an exploded perspective view of the motor 30. As shown in FIG.

  In the following description, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the rotor 10 provided in the motor 30.

  The motor 30 includes a rotor shaft 32, a rotor 10 fixed to the rotor shaft 32, a stator 40 for applying rotational driving force to the rotor 10, and a casing 50 for housing the rotor 10 and the stator 40.

  The casing 50 includes a drum 52, a first end wall 54 and a second end wall 56. The drum 52 has a structure in which a plurality of (two in the present embodiment) cylindrical walls 521 axially aligned are connected to each other by a plurality of columns 522 circumferentially arranged. And surrounds the rotor 12 and the stator 40. In FIG. 2, only one cylindrical wall 521 is shown. The first end wall 54 is attached to one axial end of the drum 52 to close the opening on the one end side. The second end wall 56 is attached to the other axial end of the drum 52 to close the opening on the other end side. The rotor shaft 32 is inserted through a hole formed in a central portion of each of the first end wall 54 and the second end wall 56.

  A cooling flow passage (not shown) is disposed on the outer surface of each of the first end wall 54 and the second end wall 56. A cooling fluid (e.g., cooling water) for flowing heat mainly from the stator 40 flows through the cooling flow path. The cooling channel may be omitted, or may be formed in each of the first end wall 54 and the second end wall 56.

  The rotor shaft 32 is fixed to the rotor 10 and extends in the axial direction of the rotor 10. The rotor shaft 32 is rotatably supported on the first end wall 54 and the second end wall 56 via a bearing 60. The rotor shaft 32 rotates integrally with the rotor 10 by the torque applied to the rotor 10.

  The rotor 10 comprises a plurality of rotor components 11 and an annular member 18, as shown in FIG. The details of the rotor 10 will be described later.

  The stator 40 is disposed to face the rotor 10 in the axial direction, and rotates the rotor 10 by an electromagnetic force. In the present embodiment, the stators 40 are disposed on both sides of the rotor 10 in the axial direction. Specifically, the stator 40 includes a first stator element disposed between the rotor 10 and the first end wall 54, and a second stator element disposed between the rotor 10 and the second end wall 56. Including. The first stator element includes a first back yoke 401 and a plurality of first electromagnet units 402. The second stator element includes a second back yoke 403 and a plurality of second electromagnet units 404.

  The first back yoke 401 is an iron core (i.e., yoke) for coupling the plurality of first electromagnet units 402 with a magnetic flux. The second back yoke 403 is an iron core (i.e., yoke) for coupling the plurality of second electromagnet units 404 with a magnetic flux. The plurality of first electromagnet units 402 and the plurality of second electromagnet units 404 respectively supply current to rotate the rotor 10 in which the plurality of permanent magnets 34 are disposed by electromagnetic force. The plurality of first electromagnet units 402 and the plurality of second electromagnet units 404 each have a stator core 405 and a stator coil 406 formed of an insulated wire wound around the stator core 405. The direct current flowing through the stator coil 406 forms a magnetic flux axially penetrating the stator core 405. By periodically reversing the direction of the direct current flowing through the stator coil 406, an electromagnetic force for rotating the rotor 10 is generated.

  A rotor 10 of an axial gap type rotary electric machine according to a first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a plan view showing a schematic configuration of the rotor 10. In the following description, the axial, radial and circumferential directions refer to the axial, radial and circumferential directions of the rotor 10.

  The rotor 10 is fixed to a rotor shaft (not shown) and rotates with the rotor shaft. The rotor 10 comprises a plurality of rotor components 11 and an annular member 18.

  The plurality of rotor components 11 are arranged side by side in the circumferential direction. In this state, the plurality of rotor components 11 are surrounded by the annular member 18. The annular member 18 is made of, for example, a carbon fiber reinforced resin.

  Each of the plurality of rotor components 11 includes a permanent magnet 12, a rotor fixing member 14, and a surrounding member 16 as a surrounding portion. In the present embodiment, a base member 20 that supports the plurality of permanent magnets 12 in the circumferential direction is realized by the plurality of surrounding members 16.

  The permanent magnet 12, the rotor fixing member 14 and the surrounding member 16 will be described with reference to FIG. 4 is a plan view showing a part of FIG. 3 in an enlarged manner.

  The permanent magnet 12 generates a driving force for rotating the rotor 10 in the circumferential direction by the interaction with a magnetic field generated due to energization of a stator coil (not shown).

  The permanent magnet 12 has a thickness in the axial direction of the rotor 10 (the direction perpendicular to the paper surface), and has a plate shape spreading in the radial direction and the circumferential direction. When viewed from the axial direction, permanent magnet 12 has a shape that is symmetrical with respect to a reference line L1 passing through its outer shape center C1 and extending in the radial direction. Although not shown, the reference line L1 passes through the rotation center RC (see FIG. 3) of the rotor 10 as viewed in the axial direction.

  The permanent magnet 12 has a pair of side surfaces 1211 and 1212. The pair of side surfaces 1211 and 1212 are circumferentially separated. Each of the pair of side surfaces 121, 121 is a flat surface extending in the radial direction. The side surface 1211 defines one end of the permanent magnet 12 in the circumferential direction. The side surface 1212 defines the other end of the permanent magnet 12 in the circumferential direction.

  The permanent magnet 12 has a pair of outer peripheral side corner portions 1221 and 1222. The pair of outer peripheral side corner portions 1221 and 1222 are respectively located on the outer side in the radial direction than the outer shape center C1.

  Each of the pair of outer peripheral side corner portions 1221 and 1222 is chamfered in an R shape. That is, the outer peripheral side corner portion 1221 has a curved surface 1231, and the outer peripheral side corner portion 1222 has a curved surface 1232.

  The curved surfaces 1231 and 1232 are curved in an arc shape so as to be convex outward from the outer shape center C1 when viewed from the axial direction. The radially inner end of the curved surface 1231 is connected to the radially outer end of the side surface 1211. The radially inner end of the curved surface 1232 is connected to the radially outer end of the side surface 1212.

  A notch 124 is formed at the outer peripheral side edge of the permanent magnet 12. The notch 124 is formed over the entire length of the permanent magnet 12 in the thickness direction (the direction perpendicular to the paper surface, that is, the axial direction of the rotor 10), and has a groove shape opening toward the radial direction as a whole. doing.

  The notch 124 has such a shape and size that the opposing inner surface 1241 described later does not contact the surrounding member 16 (specifically, the circumferential direction portion 163 described later) in a state where the centrifugal force is acting on the permanent magnet 12. It is sufficient if it has.

  The notch 124 has an opposing inner surface 1241 as an opposing surface. The opposing inner surface 1241 corresponds to the bottom of the groove-like notch 124. The opposing inner surface 1241 extends in the circumferential direction while being curved more gently than the curved surfaces 1231 and 1232 when viewed from the axial direction. The opposing inner surface 1241 extends in a direction different from the curved surfaces 1231 and 1232 when viewed from the axial direction.

  The permanent magnet 12 has a pair of inner circumferential corner portions 1251 and 1252. The pair of inner circumferential side corner portions 1251 and 1252 are respectively located radially inward of the outer shape center C1. A chamfer is given to each of a pair of inner peripheral side corner parts 1251 and 1252.

  The rotor fixing member 14 is used to fix the rotor shaft. The rotor fixing member 14 is formed with a hole 141 penetrating in the axial direction. The rotor shaft is fixed to the rotor fixing member 14 by the bolt and the nut inserted into the hole 141.

  The rotor fixing member 14 is disposed radially inward of the permanent magnet 12. In this state, the rotor fixing member 14 is in contact with the permanent magnet 12.

  The surrounding member 16 surrounds the permanent magnet 12 and the rotor fixing member 14 when viewed in the axial direction. In this state, the surrounding member 16 is in contact with the permanent magnet 12 and the rotor fixing member 14. The surrounding member 16 is formed of, for example, a carbon fiber reinforced resin.

  The surrounding member 16 includes a first radial portion 161, a second radial portion 162, a circumferential portion 163, and a connecting portion 164. These will be described below.

  The first radial portion 161 is located closer to the one side in the circumferential direction than the permanent magnet 12. The second radial portion 162 is located on the other side in the circumferential direction relative to the permanent magnet 12. Each of the first radial portion 161 and the second radial portion 162 linearly extends in the radial direction. The first radial portion 161 and the second radial portion 162 extend in different directions. The radially inner end of each of the first radial portion 161 and the second radial portion 162 is connected by a connecting portion 164. The connecting portion 164 is in contact with the rotor fixing member 14.

  The first radial portion 161 has a first inner side surface 1611 in contact with the side surface 1211 of the permanent magnet 12. The second radial portion 162 has a second inner side surface 1621 in contact with the side surface 1212 of the permanent magnet 12. The first inner side surface 1611 and the second inner side surface 1621 are planes extending in the radial direction, respectively. The first inner side surface 1611 and the second inner side surface 1621 extend in mutually different directions as viewed from the axial direction. The first inner side surface 1611 and the second inner side surface 1621 are also in contact with the side surface of the rotor fixing member 14.

  The circumferential portion 163 is located radially outward of the first radial portion 161 and the second radial portion 162. The circumferential direction portion 163 extends in the circumferential direction. The circumferential portion 163 connects the radial outer end of the first radial portion 161 and the radial outer end of the second radial portion 162.

  The circumferential direction portion 163 has an inner side surface 1631. The inner side surface 1631 faces the permanent magnet 12 in the radial direction.

  The inner surface 1631 includes an intermediate inner surface 1632, a first inner connecting surface 1633, and a second inner connecting surface 1634. These will be described below.

  The middle inner side surface 1632 is in contact with a virtual circle VC centered on the rotation center RC of the rotor 10 when viewed in the axial direction. The middle inner side surface 1632 is in contact with the virtual circle VC over the entire length in the circumferential direction. The middle inner surface 1632 includes a circumferential central portion of the inner surface 1631. Here, the central portion of the inner side surface 1631 is a portion including a position P1 where the reference line L1 intersects the inner side surface 1631 when viewed from the axial direction.

  The first inner connecting surface 1633 connects the middle inner surface 1632 and the first inner surface 1611. The first inner connecting surface 1633 extends in a direction different from the middle inner surface 1632 and the first inner surface 1611. The first inner connecting surface 1633 is farther from the virtual circle VC as it approaches the first inner surface 1611 when viewed in the axial direction. The first inner connection surface 1633 is curved in an arc shape corresponding to the curved surface 1231 of the permanent magnet 12. That is, the first inner connection surface 1633 is an R-shaped curved surface.

  The second inner connection surface 1634 connects the middle inner surface 1632 and the second inner surface 1621. The second inner connection surface 1634 extends in a direction different from the middle inner surface 1632 and the second inner surface 1621. The second inner connection surface 1634 is farther from the imaginary circle VC as it approaches the second inner surface 1621 when viewed in the axial direction. The second inner connection surface 1634 is curved in an arc shape corresponding to the curved surface 1232 of the permanent magnet 12. That is, the second inner connection surface 1634 is an R-shaped curved surface.

  As described above, in the present embodiment, the notch 124 is formed at the outer peripheral edge of the permanent magnet 12. The opposing inner surface 1241 of the notch 124 is located radially inward from the inner surface 1631 of the circumferential portion 163. The opposing inner surface 1241 is opposed to the inner surface 1631 in the radial direction. Therefore, the non-contact surface 1635 is present on the inner side surface 1631. The non-contact surface 1635 is a surface that faces the opposing inner surface 1241 in the radial direction and is located radially outward from the permanent magnet 12. That is, the non-contact surface 1635 is a surface which the permanent magnet 12 does not contact. In the present embodiment, the non-contact surface 1635 is realized by the entire middle inner surface 1632.

  Further, on the inner side surface 1631, a first contact surface 1636 and a second contact surface 1637 are further present. The first contact surface 1636 is a surface located on one side in the circumferential direction with respect to the non-contact surface 1635 and in contact with the permanent magnet 12 in the radial direction. The second contact surface 1637 is a surface located on the other side in the circumferential direction with respect to the non-contact surface 1635 and in contact with the permanent magnet 12 in the radial direction. In the present embodiment, the first contact surface 1636 is realized by the first inner connection surface 1633, and the second contact surface 1637 is realized by the second inner connection surface 1634.

  In the rotor 10, centrifugal force acts on each of the plurality of permanent magnets 12 as the rotor 10 rotates. At this time, each of the plurality of permanent magnets 12 applies a load radially outward to each of the first inner connecting surface 1633 and the second inner connecting surface 1634 of the surrounding member 16 surrounding it. Therefore, it is possible to suppress the occurrence of bending stress in each of a connection portion to the first radial direction portion 161 and a connection portion to the second radial direction portion 162 of the circumferential portion 163 which the surrounding member 16 has.

  Referring to FIGS. 5, 6 and 7, bending occurring in each of a connection portion to circumferential direction portion 163 of surrounding member 16 and a connection portion to second radial direction portion 162. The reason why the stress can be reduced will be described. FIG. 5 is a plan view showing the surrounding member 16 surrounding the permanent magnet 12A in which the notch 124 is not formed. FIG. 6 is an explanatory view showing the beam model 163A in a state in which the load Wt is uniformly applied. FIG. 7 is an explanatory view showing a beam model 163A in a state in which the load Wt is intensively applied in the vicinity of the fulcrums F1 and F2.

  As shown in FIG. 5, it is assumed that centrifugal force is acting on the permanent magnet 12A in which the notch 124 is not formed. In this case, as shown in FIG. 6, when a beam model 163A in which the circumferential direction portion 163 of the surrounding member 16 has one beam is set, the permanent magnet 12 is pressed against the circumferential direction portion 163 by the action of centrifugal force. The resulting load Wt is uniformly applied over the entire length of the beam model 163A.

  On the other hand, as shown in FIG. 4, when the permanent magnet 12 in which the notch 124 is formed is pressed against the circumferential direction portion 163 by the action of the centrifugal force, as shown in FIG. The applied load Wt is concentrated near the fulcrums F1 and F2.

  Here, the bending moment acting on the fulcrums F1 and F2 of the beam model 163A is obtained by integrating the load Wt and the distance D1 from the position where the load Wt acts to the fulcrums F1 and F2. Therefore, as shown in FIG. 7, the bending moment acting on the fulcrums F1 and F2 can be reduced by concentrating the load Wt near the fulcrums F1 and F2. As a result, bending stress can be reduced.

  Further, in the rotor 10, since each of the first contact surface 1636 and the second contact surface 1637 is formed as an R-shaped curved surface, the connection portion of the circumferential portion 163 to the first radial direction portion 161 and The load resistance of each of the connection portions to the second radial portion 162 can be enhanced.

  In the rotor 10, the non-contact surface 1635 is realized by the entire middle inner side surface 1632. Therefore, the position at which the load caused by the centrifugal force acting on the permanent magnet 12 is applied to the circumferential direction portion 163 can be further distanced from the central portion in the circumferential direction. As a result, it is possible to further reduce the bending stress generated in each of the connection portion to the first radial direction portion 161 and the connection portion to the second radial direction portion 162 of the circumferential direction portion 163.

  Further, in the rotor 10, since the notches 124 are formed in the permanent magnet 12, the load caused by the centrifugal force acting on the permanent magnet 12 can be made of the circumferential direction portion 163 while securing the strength of the circumferential direction portion 163. The voltage can be applied as close as possible to each of the connection to the first radial portion 161 and the connection to the second radial portion 162.

  Further, in the rotor 10, since the plurality of surrounding members 16 are surrounded by the annular member 18, it is possible to suppress the radially outward deformation of the circumferential portion 163 of each of the plurality of surrounding members 16 it can.

Application Example 1 of First Embodiment
Application Example 1 of the first embodiment will be described with reference to FIG. FIG. 8 is a plan view showing a part of the rotor 101 according to the application example 1 in an enlarged manner.

  In the rotor 101, compared with the rotor 10, the notch 124 is not formed in the permanent magnet 12. Instead, a notch 1633 is formed in the inner peripheral edge portion of the circumferential direction portion 163.

  The notch 1633 is formed over the entire length in the thickness direction of the circumferential portion 163 (the direction perpendicular to the paper surface, that is, the axial direction of the rotor 10), and has a groove shape opening inward in the radial direction as a whole. Have.

  The notch 1633 may have a shape and a size such that the opposing inner surface 1634 described later does not contact the permanent magnet 12 in a state where the centrifugal force acts on the permanent magnet 12.

  The notch 1633 has an opposing inner surface 1634. The opposing inner surface 1634 corresponds to the bottom surface of the groove-like notch 1633. The opposing inner surface 1634 is located radially outward of the inner side surface 1631. The opposing inner surface 1634 is opposed to the permanent magnet 12 in the radial direction. The non-contact surface 1635 which the permanent magnet 12 does not contact is realized by the opposing inner surface 1634.

  Also in this application example, as in the first embodiment, bending stress generated in each of the connection portion to the first radial direction portion 161 of the circumferential direction portion 163 and the connection portion to the second radial direction portion 162 is It can be reduced.

  Further, in the present application example, since the notch 124 is not formed in the permanent magnet 12, the volume of the permanent magnet 12 can be secured. Therefore, the torque of the axial gap type rotary electric machine can be secured.

Second Embodiment
A rotor 10A as a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a plan view showing the rotor 10A.

  The rotor 10 </ b> A does not include the base member 20 realized by the plurality of surrounding members 16. Instead, a base member 20A is provided.

  The base member 20A includes an inner annular portion 22, a plurality of radial portions 24, and an outer annular portion 26. These will be described below.

  The inner annular portion 22 is used to fix the rotor shaft. The inner annular portion 22 is formed with a plurality of holes 221 penetrating in the axial direction. The rotor shaft is fixed to the inner annular portion 22 by bolts and nuts inserted into each of the plurality of holes 221.

  The outer annular portion 26 surrounds the inner annular portion 22. The outer annular portion 26 is disposed concentrically with the inner annular portion 22.

  The plurality of radial portions 24 connect the inner annular portion 22 and the outer annular portion 26. Each of the plurality of radial portions 24 extends linearly in the radial direction. The plurality of radial direction portions 24 are arranged at equal intervals in the circumferential direction.

  One permanent magnet 12 is disposed between two radial direction portions 24 adjacent in the circumferential direction among the plurality of radial direction portions 24. That is, in the present embodiment, the radial direction portion 24 positioned on one side in the circumferential direction relative to the permanent magnet 12, the radial direction portion 24 positioned on the other side in the circumferential direction relative to the permanent magnet 12, and the inner annular portion 22. An encircling portion 28 surrounding the permanent magnet 12 is realized including a portion at the same position as the permanent magnet 12 in the circumferential direction and a portion at the same position as the permanent magnet 12 in the circumferential direction of the outer annular portion 26. ing. That is, in the present embodiment, the plurality of enclosures 28 are connected to one another. In other words, the radial direction portion 24 (first radial direction portion) of one of the two surrounding portions 28 adjacent in the circumferential direction among the plurality of surrounding portions 28 is the radial direction portion 24 (the first radial direction portion) Two radial directions) are realized.

  Also in the rotor 10A, since the notch 124 is formed in the outer peripheral edge portion of the permanent magnet 12, the permanent magnet 12 is formed in the middle portion of the outer annular portion 26 at the same position as the permanent magnet 12 in the circumferential direction. No load is exerted due to the acting centrifugal force. Therefore, it is possible to reduce bending stress generated at each of both ends of a portion of the outer annular portion 26 located at the same position as the permanent magnet 12 in the circumferential direction.

  Further, in the present embodiment, since the plurality of surrounding portions 28 are connected to one another, the handling of the base member 20A is facilitated.

  As mentioned above, although the embodiment of the present invention has been described in detail, these are merely examples, and the present invention is not construed as being limited in any way by the description of the embodiment described above.

  The rotor according to the present invention may be used for a generator or for an electric motor.

  In the present invention, it is not essential to form a notch in any of the permanent magnet and the circumferential direction portion. For example, by forming the outer peripheral edge of the permanent magnet not to correspond to the inner peripheral edge of the circumferential direction portion, the circumferential center portion in the circumferential direction portion may be separated from the permanent magnet.

  In the first embodiment, the annular member 18 is not necessarily required.

DESCRIPTION OF SYMBOLS 10 Rotor 12 Permanent magnet 124 Notch 1241 Opposing inner surface 16 Surrounding member 161 1st radial direction part 1611 1st inner surface 162 2nd radial direction part 1621 2nd inner surface 163 circumferential direction part 1631 Inner surface 1632 Middle inner surface 1633 1st inner side Connection surface 1634 Second inner connection surface 1635 Non-contact surface 1636 First contact surface 1637 Second contact surface 20 Base member 30 Motor 40 Stator

Claims (6)

Axial gap type electric rotating machine,
With the rotor,
A stator which is disposed to face the rotor in the axial direction of the rotor and rotates the rotor by an electromagnetic force;
The rotor is
With multiple permanent magnets,
And a base member that supports the plurality of permanent magnets in the circumferential direction of the rotor.
The base member is
And a plurality of enclosures that individually surround each of the plurality of permanent magnets when viewed in the axial direction of the rotor.
Each of the plurality of enclosures is
A first radial portion which is located on one side in the circumferential direction with respect to a permanent magnet disposed on the inner side and extends in the radial direction of the rotor
A second radial portion which is located on the other side in the circumferential direction with respect to the permanent magnet and extends in the radial direction;
A circumferential direction portion located outside the first radial direction portion and the second radial direction portion and connecting the first radial direction portion and the second radial direction portion;
The circumferential portion is
It has an inner side facing the permanent magnet in the radial direction,
The inner side is
A non-contact surface which is formed in a region including the central portion in the circumferential direction of the inner side surface, and is located away from the permanent magnet;
A first contact surface located on one side of the non-contact surface in the circumferential direction and in contact with the permanent magnet in the radial direction;
An axial gap type rotary electric machine comprising: a second contact surface located on the other side in the circumferential direction than the non-contact surface and in contact with the permanent magnet in the radial direction. The axial gap type rotating electric machine according to claim 1, wherein
The first radial portion is
It has a first inner surface in contact with one end of the permanent magnet in the circumferential direction,
The second radial portion is
It has a second inner surface in contact with the other end of the permanent magnet in the circumferential direction,
The inner side is
An intermediate inner surface in contact with a virtual circle centered on the rotation center of the rotor when viewed from the axial direction;
A first inner connecting surface connecting the middle inner surface and the first inner surface, and moving away from the imaginary circle the closer to the first inner surface as viewed from the axial direction;
The intermediate inner side surface and the second inner side surface are connected, and the second inner connection surface is separated from the imaginary circle as it approaches the second inner side surface as viewed from the axial direction;
The middle inner surface includes the non-contact surface,
The first inner connection surface includes the first contact surface,
An axial gap type rotary electric machine, wherein the second inner connection surface includes the second contact surface. An axial gap type rotary electric machine according to claim 2, wherein
An axial gap type rotary electric machine in which the non-contact surface is realized by the entire middle inner side surface. An axial gap type rotating electric machine according to any one of claims 1 to 3, wherein
The permanent magnet is
It has a facing surface which is located on the inner side in the radial direction with respect to the inner side surface, and faces the inner side surface in the radial direction,
The axial gap type rotary electric machine, wherein the non-contact surface is formed in a region of the inner side surface facing the opposing surface in the radial direction. An axial gap type rotating electric machine according to any one of claims 1 to 3, wherein
The axial gap type rotating electrical machine, wherein the non-contact surface is formed outside the radial direction with respect to the first contact surface and the second contact surface. An axial gap type rotating electric machine according to any one of claims 1 to 5, wherein
An axial gap type rotary electric machine in which the first radial direction portion of one of two surrounding portions adjacent to each other in the circumferential direction among the plurality of surrounding portions is realized by the second radial direction portion of the other.

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