JP2010226882A - End plate for rotor, permanent magnet support member and rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an end plate for a rotor capable of reducing the stress generated in a coupling section. <P>SOLUTION: A storage hole 20, in which a permanent magnet 30 is stored, is bored in a core 10 for the rotor. The end plate for the rotor includes a member provided on one side with respect to the core 10 for the rotor, and the member 52 existing from the member in the axial direction along a rotating shaft P. The member 52 is separated from an outer peripheral part 12, located on a side opposite to the rotating shaft P, with respect to the storage hole 20 of the core 10 for the rotor. The member 52 also pinches the permanent magnets 30, together with an inner peripheral part 11 located on the rotating shaft P side, with respect to the storage hole 20 of the core 10 for the rotor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor end plate, a permanent magnet support member, and a rotor, and more particularly to a technique for reducing stress generated in a rotor core.

  Patent Document 1 describes an embedded magnet type field element core. The field element core is provided with a storage hole through which a plurality of permanent magnets are inserted. With the permanent magnet inserted through the storage hole, the field element core and the permanent magnet work together to function as a field element. The field element in Patent Document 1 functions as a rotor. In Patent Document 1, twelve permanent magnets are exemplified, and two permanent magnets adjacent in the circumferential direction around the rotation axis form one field magnetic pole. That is, Patent Document 1 exemplifies a six-pole field element.

  In addition, a gap is formed extending from both ends of the set of permanent magnets belonging to the same field magnetic pole to the outer peripheral edge of the field element core. The air gap extends to the vicinity of the outer peripheral edge of the field element core. Such a gap prevents the field poles adjacent in the circumferential direction from being short-circuited. The core at the part sandwiched between the gap and the outer peripheral edge is referred to as a connecting portion in the present specification (unlike Patent Document 1). In other words, the field element core connects the inner peripheral portion on the rotating shaft side with respect to the permanent magnet, the outer peripheral portion on the side opposite to the rotating shaft with respect to the permanent magnet, and the outer peripheral portions. It can be grasped as having a connecting part.

  Patent Documents 2 to 8 are disclosed as techniques related to the present invention.

JP 2007-31880 A JP 2000-156946 A JP 2000-152535 A JP 2001-169485 A Japanese Utility Model Publication No. 6-2976 JP 2003-74472 A JP 2006-166543 A JP 2007-159196 A

  In the technique described in Patent Document 1, since the permanent magnet is sandwiched between the inner peripheral portion and the outer peripheral portion, the position in the radial direction is fixed. Therefore, the embedded magnet type field element core does not require components other than the outer peripheral portion and the inner peripheral portion from the viewpoint of fixing the permanent magnet in the radial direction.

  Moreover, it is desirable that the thickness of the connecting portion in the radial direction is thin. This is because it is possible to suppress the permanent magnets belonging to different field magnetic poles from being short-circuited via the connecting portion.

  However, when the thickness of the connecting portion in the radial direction is reduced, when the field element rotates around the rotation axis, the centrifugal force acting on the permanent magnet is transmitted to the outer peripheral portion and stress is applied to the connecting portion. concentrate. Therefore, it was difficult to reduce the thickness of the connecting portion in the radial direction.

  Therefore, an object of the present invention is to provide an end plate for a rotor and a rotor that can reduce stress in the connecting portion.

  In the first aspect of the rotor end plate according to the present invention, a plurality of permanent magnets (30 to 32) arranged in a ring around the rotation axis (P) and at least one permanent magnet are stored. A plurality of storage holes (20) are bored, and an inner peripheral part (11) existing on the rotating shaft side with respect to the storing hole, and an outer peripheral part (on the opposite side to the rotating shaft with respect to the storing hole) 12) and a rotor core having a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction centered on the rotary shaft, An end plate (50) provided on at least one side in the axial direction along the first member (51) provided on the one side in the axial direction with respect to the rotor, and the first member The plurality of permanents together with the inner peripheral part while extending and separating from the outer peripheral part And a plurality of second members that sandwich each (52) of the stone.

  A second aspect of the rotor end plate according to the present invention is the rotor end plate according to the first aspect, wherein the second member (52) is centered on the rotation axis (P). The permanent magnet is sandwiched with the inner peripheral portion (11) only on both sides of the permanent magnet (30 to 32) in the circumferential direction, and a plurality of the permanent magnets are placed in the circumferential direction in one storage hole (20). Stored side by side.

  A third aspect of the rotor end plate according to the present invention is the rotor end plate according to the first aspect, wherein the second member (52) covers the permanent magnet.

  A fourth aspect of the rotor end plate according to the present invention is the rotor end plate according to any one of the first to third aspects, the first member (51) and the second member. At least one of (52) is non-magnetic.

  According to a first aspect of the rotor of the present invention, the plurality of permanent magnets (30 to 32) and a plurality of storage holes (20) for storing at least one permanent magnet are formed, and the storage holes An inner peripheral portion (11) existing on the rotating shaft side, a plurality of outer peripheral portions (12) existing on the opposite side to the rotating shaft with respect to the storage hole, and a circumferential direction around the rotating shaft The rotor core (10) having a connecting portion (13) for connecting the outer peripheral portions to each other, and the rotor end plate (50) according to any one of the first to fourth aspects. And a second rotor end plate provided on the opposite side of the rotor end plate in the axial direction, wherein the second member (52) is the first member (51) and the second member. The rotor end plates are connected together and fixed.

  According to a second aspect of the rotor of the present invention, the plurality of permanent magnets (30 to 32) and a plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and the storage holes An inner peripheral portion (11) existing on the rotating shaft side, a plurality of outer peripheral portions (12) existing on the opposite side to the rotating shaft with respect to the storage hole, and a circumferential direction around the rotating shaft The rotor core (10) having a connecting portion (13) for connecting the outer peripheral portions to each other, and the rotor end plate (50) according to any one of the first to fourth aspects. And a gap is formed between the outer peripheral portion (12) and the permanent magnet (30).

  According to a third aspect of the rotor of the present invention, the plurality of permanent magnets (30 to 32) and a plurality of storage holes (20) for storing at least one permanent magnet are formed, and the storage holes An inner peripheral portion (11) existing on the rotating shaft side, a plurality of outer peripheral portions (12) existing on the opposite side to the rotating shaft with respect to the storage hole, and a circumferential direction around the rotating shaft And a plurality of core portions (10A, 10B) including a connecting portion (13) for mutually connecting the outer peripheral portions, and the plurality of core portions face each other in the axial direction, and the plurality of cores A plurality of the rotor core plates (50, 70) according to any one of the first to fourth aspects, wherein the rotor cores (10) are arranged so as to be offset from each other in the circumferential direction; Each of the core portions, and the first one on one side in the axial direction. One of the second members that are adjacent to each other and extend from the one of the first members has one core portion (10A) that is adjacent to the one first member on the other side in the axial direction. The plurality of permanent magnets included in the one core part are sandwiched together with the inner peripheral part included in the one core part while being separated from the outer peripheral part.

  According to a fourth aspect of the rotor of the present invention, the plurality of permanent magnets (30 to 32) and a plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and the storage holes An inner peripheral portion (11) existing on the rotating shaft side, a plurality of outer peripheral portions (12) existing on the opposite side to the rotating shaft with respect to the storage hole, and a circumferential direction around the rotating shaft The rotor core (10) having a connecting portion (13) for connecting the outer peripheral portions to each other, and the rotor end plate (50) according to any one of the first to fourth aspects. A set of masses of the permanent magnet (30) and the outer peripheral portion (12) is m, a set of mass centers of the permanent magnet and the outer peripheral portion, and the rotating shaft (P). R is the distance between them, ω is the angular velocity at the maximum rotational speed of the rotor core, and the connection part (13) , L is the distance from the center of mass to a straight line parallel to the radial direction centered on the rotation axis, Z is the sectional modulus in the cross section formed by the axial direction and the radial direction of the connecting portion (13), Is Fs, the correction coefficient is σ, and the yield point of the connecting portion is YP, σ · Fs · L · mRω2 / (2Z)> YP is satisfied.

  According to a first aspect of the permanent magnet support member of the present invention, the plurality of permanent magnets (30 to 32) and a plurality of storage holes (20) for storing at least one of the permanent magnets are formed, An inner peripheral portion (11) existing on the rotation shaft side with respect to the storage hole, a plurality of outer peripheral portions (12) existing on the opposite side to the rotation shaft with respect to the storage hole, and the rotation shaft as a center The rotation that includes two core portions (10A, 10B) including a connecting portion (13) that connects the outer peripheral portions to each other in the circumferential direction, and the two core portions face each other in the axial direction A rotor including a child core (10), a support member (70; 71, 72, 52) for supporting the permanent magnet, and a first member (71) provided between the core portions; The outer peripheral portion extending from the first member and having one core portion; The plurality of second members (52) and the first member that sandwich the plurality of permanent magnets of the one core portion together with the inner peripheral portion of the one core portion, while And a plurality of second magnets sandwiching the plurality of permanent magnets of the second core part together with the inner peripheral part of the second core part while being separated from the outer peripheral part of the second core part. And three members (72).

  According to the 1st aspect of the end plate for rotors concerning this invention, a rotor is realizable by providing the end plate for rotors with respect to the core for rotors in which the permanent magnet was stored.

  When such a rotor rotates around the rotation axis, the permanent magnet is supported by the second member, so that the centrifugal force acting on the permanent magnet is difficult to be transmitted to the outer peripheral portion. As a result, the stress applied to the connecting portion can be reduced, so that a thin bridge in the radial direction can be employed as the connecting portion. Therefore, a short circuit between the permanent magnets via the connecting portion can be reduced.

  According to the second aspect of the rotor end plate of the present invention, a plurality of permanent magnets are stored side by side in the circumferential direction in one storage hole. Therefore, compared with the case where one permanent magnet is stored in one storage hole, the length of each permanent magnet in the circumferential direction is short. Therefore, when a centrifugal force is applied to the permanent magnet, the amount of deformation of the permanent magnet can be reduced, and contact between the permanent magnet and the outer peripheral portion can be easily avoided. Therefore, the centrifugal force acting on the permanent magnet is difficult to be transmitted to the outer peripheral portion.

  According to the 3rd aspect of the end plate for rotors concerning this invention, compared with the aspect which only the edge of the permanent magnet in the circumferential direction centering on a rotating shaft pinches | interposes a 2nd member and an inner peripheral part from the other mutually Thus, the stress generated in the permanent magnet can be reduced.

  According to the 4th aspect of the end plate for rotors concerning this invention, when the 1st member was contacting the inner peripheral part, the end plate for rotors and the inner peripheral part were exhibited to the outer peripheral part side. Even if the magnetic pole surface of the permanent magnet and the magnetic pole surface of the permanent magnet presented on the inner peripheral side are structurally connected, it is possible to suppress a short circuit of the magnetic flux between the magnetic pole surfaces.

  According to the first aspect of the rotor according to the present invention, since the second member is fixed by the rotor end plate and the second rotor end plate at both axial ends, the strength of the second member Can be increased. Therefore, even if a centrifugal force acts on the second member as the rotor rotates, deformation of the second member can be suppressed. Further, when an existing fastening member (for example, a rivet or a bolt) is used as the second member, the manufacturing cost can be reduced.

  According to the 2nd aspect of the rotor concerning this invention, the force which acts on an outer peripheral part among the centrifugal forces which act on a permanent magnet can further be suppressed.

  According to the 3rd aspect of the rotor concerning this invention, since a core part is shifted | deviated and arrange | positioned in the circumferential direction, core parts form what is called a skew angle. Therefore, the vibration of the rotor can be reduced. Further, even in a rotor having a skew angle, the second member is spaced apart from the outer peripheral portion, and the permanent magnet is sandwiched with the inner peripheral portion, so that the stress generated in the connecting portion can be reduced.

  According to the 4th aspect of the rotor concerning this invention, even if a rotor belongs to the range with which (sigma) * Fs * L * mR (omega) 2 / (2Z)> YP, damage to a connection part can be suppressed.

  According to the 1st aspect of the permanent magnet support member concerning this invention, it is not necessary to provide a 2nd member and a 3rd member with respect to the end plate for rotors provided in the end in the axial direction of a rotor. Therefore, the existing rotor end plate can be used.

It is a perspective view which shows an example of a notional structure of a rotor. It is a figure which shows an example of a notional structure of the rotor in a cross section perpendicular | vertical to a rotating shaft. It is a perspective view which shows an example of a notional structure of the end plate for rotors. It is a figure which shows the notional structure of the conventional rotor in the cross section perpendicular | vertical to a rotating shaft. It is a figure which shows an example of a notional structure of the electric motor in the cross section containing a rotating shaft. It is a figure which shows an example of a notional structure of the rotor in a cross section perpendicular | vertical to a rotating shaft. It is a figure which shows an example of a notional structure of the end plate for rotors. It is a figure which shows an example of a notional structure of the rotor in a cross section perpendicular | vertical to a rotating shaft. It is a figure which shows an example of a notional structure of the rotor in a cross section perpendicular | vertical to a rotating shaft. It is a perspective view which shows an example of a notional structure of a rotor. It is a figure for demonstrating the positional relationship between core parts. It is a figure for demonstrating the positional relationship between core parts. It is a perspective view which shows an example of a notional structure of the end plate for rotors.

First embodiment.
FIG. 1 is a perspective view showing an example of a conceptual configuration of the rotor according to the first embodiment. This rotor is a radial gap type rotor, and includes a rotor core 10 and end plates (hereinafter simply referred to as end plates) 50 and 60 for the rotor.

  The rotor core 10 is a soft magnetic material (for example, iron). In the illustration of FIG. 1, the rotor core 10 has, for example, a cylindrical outer shape centered on the rotation axis P. However, it is not always necessary to have a cylindrical shape, and for example, it may have a columnar outer shape in which a cross section perpendicular to the rotation axis P is an ellipse.

  The end plate 50 is provided at one end of the rotor core 10 in the axial direction along the rotational axis P (hereinafter simply referred to as the axial direction). The end plate 60 is provided at the other end in the axial direction of the rotor core 10. In other words, the end plates 50 and 60 sandwich the rotor core 10 from opposite sides in the axial direction.

  In the illustration of FIG. 1, the rotor core 10 and the end plates 50 and 60 are provided with a shaft hole 40 that includes the rotation axis P and penetrates the rotor along the axial direction. A shaft (not shown) is inserted through the shaft hole 40. The rotor core 10 is fixed to the shaft, for example, by shrink fitting, press fitting, welding, bolting or the like. The shaft hole 40 is not an essential requirement. For example, shafts may be provided on the end plates 50 and 60 so as to extend from the end plates 50 and 60 to the side opposite to the rotor core 10, respectively. In this case, the shaft hole 40 is unnecessary.

  FIG. 2 shows an example of a conceptual configuration of the rotor in a cross section perpendicular to the rotation axis P at a position passing through the rotor core 10.

  The rotor core 10 is provided with a plurality of storage holes 20 for storing a plurality of permanent magnets 30 respectively. The plurality of storage holes 20 are annularly arranged around the rotation axis P and extend along the axial direction. Note that the storage hole 20 does not necessarily have to extend along the axial direction. The storage hole 20 may be inclined with respect to the axial direction so as to form a skew, for example. At least one permanent magnet 30 is stored in the storage hole 20. In the example of FIG. 2, one permanent magnet 30 is stored in one storage hole 20. In the illustration of FIG. 2, four storage holes 20 for storing the four permanent magnets 30 are shown, but there may be six or more.

  Moreover, the core 10 for rotors may be comprised by the some electromagnetic steel plate laminated | stacked on the axial direction. The thickness of one electromagnetic steel sheet in the axial direction is, for example, 0.1 mm to 0.5 mm. And these several electromagnetic steel plates are mutually fixed by caulking or welding, for example. The electromagnetic steel plates laminated in the axial direction can reduce eddy currents generated in the rotor core 10 due to the magnetic flux flowing through the rotor core 10 along the cross section perpendicular to the rotation axis P.

  The rotor core 10 may be a dust core. Since the dust core is intentionally molded including an insulator, its electrical resistance is high. Therefore, the eddy current generated in the rotor core 10 can be reduced.

  The permanent magnet 30 is a rare-earth magnet mainly composed of neodymium, iron, or boron, for example, and is stored in the storage hole 20. The permanent magnet 30 has, for example, a plate-like rectangular parallelepiped shape, and is arranged so that the thickness direction thereof is along the radial direction of the permanent magnet 30. Speaking more precisely with respect to the shape illustrated in FIG. 2, the thickness direction of the permanent magnet 30 coincides with the radial direction at the center position of the permanent magnet 30 in the cross section perpendicular to the rotation axis P. The permanent magnet 30 is magnetized in the radial direction (hereinafter, when referring to the radial direction of the component, the radial direction at the position where the component is arranged is simply referred to as the radial direction). Here, the permanent magnet 30 is magnetized in the thickness direction. The magnetic pole surfaces 30a that the permanent magnets 30 adjacent to each other in the circumferential direction around the rotation axis P (hereinafter simply referred to as the circumferential direction) present on the outer circumferential side in the radial direction are different from each other in the circumferential direction.

  The permanent magnet 30 functions as a field element for supplying a field magnetic flux to the stator when the stator is disposed on the opposite side of the rotation axis P with respect to the main rotor. In the illustration of FIG. 2, one permanent magnet 30 functions as one field magnetic pole.

  The radial thickness of the storage hole 20 may be set to be 2 to 7% larger than the radial thickness of the permanent magnet 30 stored in itself. Accordingly, the gap between the permanent magnet 30 and the rotor core 10 is reduced while facilitating the insertion of the permanent magnet 30 into the storage hole 20.

  The surface of the permanent magnet 30 may be coated with a metal such as aluminum, or may be painted with a resin or the like. Thereby, the permanent magnet 30 can be protected.

  Here, in the rotor core 10, a portion existing on the rotation axis P side (hereinafter also referred to as an inner peripheral side) with respect to each of the storage holes 20 is defined with respect to the inner peripheral portion 11 and each of the storage holes 20. A portion existing on the side opposite to the rotation axis P (hereinafter also referred to as the outer peripheral side) is referred to as the outer peripheral portion 12.

  A plurality of outer peripheral portions 12 adjacent in the circumferential direction are connected to each other by a connecting portion 13 (hereinafter also referred to as a bridge portion 13). The bridge portion 13 presents the outer peripheral edge of the rotor core 10 together with the outer peripheral portion 12.

  In the illustration of FIG. 2, the rotor core 10 is provided with a rib portion 14. The rib portion 14 extends from the inner peripheral portion 11 to the outer peripheral side along the radial direction between the storage holes 20 adjacent in the circumferential direction. The bridge portion 13 and the rib portion 14 are connected to each other on the outer peripheral side. Since the rib portion 14 can improve the q-axis inductance, the reluctance torque can be effectively used when a motor is configured by providing a stator from the outer peripheral side with respect to the rotor.

  Moreover, the rib part 14 is facing each of these two outer peripheral parts 12 via the space | gap 22 between the two outer peripheral parts 12 adjacent in the circumferential direction. Since the gap 22 is interposed between the rib portion 14 and the outer peripheral portion 12, the magnetic flux is short-circuited between the outer peripheral portions 12 adjacent to each other via the rib portion 14 or between the inner peripheral portion 11 and the outer peripheral portion 12. Do not invite. Further, the rib portion 14 and the permanent magnet 30 adjacent to the rib portion 14 in the circumferential direction face each other through the gap 22. In other words, the air gap 22 extends from both ends in the circumferential direction of the permanent magnet 30 along the rib portion 14 and the outer peripheral portion 12 to the outer peripheral side. Since the air gaps 22 exist on both sides in the circumferential direction of the permanent magnet 30, it is possible to suppress a short circuit of magnetic flux generated between the one magnetic pole surface 30 a and the other magnetic pole surface 30 b in the radial direction of the permanent magnet 30. it can.

  In the permanent magnet embedded rotor in which the permanent magnet 30 is embedded in the rotor core 10, it is desirable that the rib portion 14 be provided from the viewpoint of effective use of the reluctance torque described above. However, this is not an essential requirement, and the rib portion 14 may not be provided. When the rib portion 14 is not provided, the bridge portion 13 connects the outer peripheral portions 12 to each other in the circumferential direction while being separated from the inner peripheral portion 11.

  The member 52 is a component of the end plate 50, for example. FIG. 3 is a perspective view showing an example of a conceptual configuration of the end plate 50. The end plate 50 includes members 51 and 52. The member 51 is provided facing the rotor core 10 in the axial direction. 1 corresponds to the member 51.

  The member 52 extends from the member 51. In the illustration of FIG. 3, the member 52 extends along the extending direction (here, the axial direction) of the storage hole 20. The member 52 is separated from the outer peripheral portion 12 while the end plate 50 is attached to the rotor core 10 in which the permanent magnet 30 is stored. (See also FIG. 2).

  2 and 3, two members 52 are inserted into one storage hole 20. The two members 52 are located at both ends in the circumferential direction of the permanent magnet 30. In this rotor, the field magnetic flux supplied from the end in the circumferential direction of the permanent magnet 30 to the stator is smaller than the field magnetic flux supplied from the center (pole center) of the permanent magnet 30 to the stator. Therefore, when the member 52 is positioned at the end of the permanent magnet 30, the field magnetic flux supplied from the rotor to the stator is hardly hindered even if the member 52 is configured to be non-magnetic.

  2 and 3, the two members 52 located at both ends of the permanent magnet 30 sandwich the permanent magnet 30 in the circumferential direction from the opposite sides. In the illustration of FIG. 2, the member 52 has a shape in which a cross section perpendicular to the rotation axis P is L-shaped. The two members 52 are fitted at the corners on both sides in the circumferential direction of the permanent magnet 30. Thus, since the member 52 has pinched the permanent magnet 30 from the opposite side in the circumferential direction, the permanent magnet 30 can be fixed in the circumferential direction.

  The member 52 is preferably separated from the inner peripheral portion 11. Thereby, even if the member 52 is comprised with the magnetic body, the magnetic pole surface 30a of the permanent magnet 30 presented on the outer peripheral side and the magnetic pole surface of the permanent magnet 30 presented on the inner peripheral side on both sides in the circumferential direction of the permanent magnet 30 It is possible to prevent the magnetic flux from being short-circuited through the member 52 and the inner peripheral portion 11 with respect to 30b.

  Here, when the member 52 is made of a magnetic material, the flow of magnetic flux that is short-circuited between the magnetic pole surfaces 30a and 30b via the member 52 is considered. The magnetic flux flows in the circumferential direction in the first portion of the member 52 that faces the magnetic pole surface 30a in the thickness direction of the permanent magnet 30. Further, the second portion of the member 52 that is adjacent to the permanent magnet 30 in the circumferential direction flows along the thickness direction of the permanent magnet 30. Accordingly, the width in the thickness direction of the permanent magnet 30 for the first portion and the width in the circumferential direction for the second portion are reduced to such an extent that the magnetic flux flowing through the first portion and the second portion is easily magnetically saturated. Is desirable. Thereby, it is possible to further suppress short-circuiting of the magnetic flux between the magnetic pole surfaces 30a and 30b via the member 52.

  When a rotating electrical machine is configured by arranging a stator so as to face the rotor from the outer peripheral side in the radial direction with respect to such a rotor, the rotor rotates about the rotation axis P.

  Centrifugal force acts on the rotor by the rotation of the rotor about the rotation axis P. The member 52 supports the permanent magnet 30 from the outer peripheral side while being separated from the outer peripheral portion 12 (see also FIG. 2). Therefore, the force transmitted to the outer peripheral part 12 among the centrifugal forces acting on the permanent magnet 30 can be reduced. Thereby, the stress applied to the bridge part 13 can be reduced. Therefore, even if a bridge portion having a small thickness in the radial direction is adopted as the bridge portion 13, the bridge portion 13 is hardly deformed. As the bridge portion 13 is thinner, the bridge portion 13 can reduce the short circuit between the permanent magnets 30 adjacent in the circumferential direction.

  The member 52 may be fixed to the end plate 60. Although it does not specifically limit about this fixing method, For example, you may provide the recessed part fitted to the member 52 in an axial direction in the end plate 60. FIG. In this case, both ends of the member 52 in the axial direction are fixed by the end plate 60 and the member 51. Therefore, compared with the case where the member 52 is fixed only at one end in the axial direction, the amount of deformation of the member 52 can be reduced. Thereby, it is easy to avoid the permanent magnet 30 coming into contact with the outer peripheral portion 12. Therefore, it can suppress more reliably that the permanent magnet 30 is urged | biased to the outer peripheral part 12, Therefore The force transmitted to the outer peripheral part 12 among the centrifugal force which acts on the permanent magnet 30 can be reduced.

  In the example of FIG. 2, a rotor in which the permanent magnet 30 and the outer peripheral portion 12 are separated from each other is shown. However, for example, the rotation of the rotor causes the center of the permanent magnet 30 to be deformed to the outer peripheral side. The permanent magnet 30 and the outer peripheral portion 12 may be in contact with each other. In this case, although the centrifugal force acting on the permanent magnet 30 is transmitted to the outer peripheral portion 12, a part of the centrifugal force is inhibited from being transmitted to the outer peripheral portion 12 by the member 52. Therefore, even in this case, it is possible to suppress the centrifugal force acting on the permanent magnet 30 from being transmitted to the outer peripheral portion 12 and to reduce the stress generated in the bridge portion 13 as compared with the conventional rotor. Further, as long as the permanent magnet 30 is held by the member 52, the permanent magnet 30 and the outer peripheral portion 12 may be in contact with each other regardless of the rotation of the rotor. This is because the member 52 supports a part of the centrifugal force acting on the permanent magnet 30 and prevents this from being transmitted to the outer peripheral portion 12.

  However, if the permanent magnet 30 and the outer peripheral portion 12 are separated from each other including the rotation of the rotor, in other words, if there is a gap between the permanent magnet 30 and the outer peripheral portion 12, the centrifugal force generated in the permanent magnet 30 Can be prevented from being transmitted to the outer peripheral portion 12. Therefore, the stress generated in the bridge portion 13 can be further reduced.

  In addition, when the member 51 and the inner peripheral part 11 are contacting, the end plate 50 and the inner peripheral part 11 couple | bond together, the magnetic pole surface 30a of the permanent magnet 30 exhibited on the outer peripheral side, and the permanent exhibited on the inner peripheral side. The magnetic pole surface 30b of the magnet 30 is structurally connected. In such a case, it is preferable that at least one of the members 51 and 52 is a nonmagnetic material. Thereby, it is possible to prevent the magnetic flux from being short-circuited between the magnetic pole surfaces 30 a and 30 b via the end plate 50 and the inner peripheral portion 11.

  In the illustration of FIG. 2, both of the two members 52 provided for one permanent magnet 30 are separated from the outer peripheral portion 12. However, at least one of the two members 52 only needs to be separated from the outer peripheral portion 12. Although the centrifugal force acting on the permanent magnet 30 can be transmitted to the outer peripheral portion 12 through the member 52 in contact with the outer peripheral portion 12, it is not transmitted through the member 52 separated from the outer peripheral portion 12. Therefore, the centrifugal force transmitted to the outer peripheral portion 12 can be reduced as compared with the rotor in which the member 52 is not provided, and thus the stress generated in the bridge portion 13 can be reduced. Further, as long as the permanent magnet 30 is held by the member 52, the permanent magnet 30 and the outer peripheral portion 12 may be in contact with each other regardless of the rotation of the rotor. This is because the member 52 supports a part of the centrifugal force acting on the permanent magnet 30 and prevents this from being transmitted to the outer peripheral portion 12.

  Here, the stress which arises in the bridge part 13 of the conventional rotor is considered. FIG. 4 shows an example of a conceptual configuration of a conventional rotor in a cross section perpendicular to the rotation axis P. In FIG. 4, a rotor provided with six field magnetic poles is shown. Compared with the rotor shown in FIG. 2, the member 52 is not provided. Further, through-holes 15 through which rivets or bolts for fixing end plates provided on both sides in the axial direction of the rotor are inserted are provided in the rotor core 10. The through hole 15 is provided in the inner peripheral portion 11, for example.

  The mass of a set of the permanent magnet 30 and the outer peripheral portion 12 is m, the distance between the center of mass MP of the permanent magnet 30 and the outer peripheral portion 12 and the rotation axis P is R, and the maximum rotational speed of the rotor If the angular velocity at is ω, the centrifugal force F generated in the rotor is expressed by the following equation.

F = mRω ² (1)

  Assuming that the distance from the point on the outer peripheral part 12 side to the straight line passing through the center of mass MP and parallel to the radial direction in the boundary between the bridge part 13 and the rib part 14 is L, the bending moment M generated in the bridge part 13 is: It is represented by

  M = LF / 2 (2)

  Further, when the width in the radial direction of the bridge portion 13 is h and the height of the rotor core 10 in the axial direction is b, the section coefficient Z of the bridge portion 13 is expressed by the following equation.

^{Z = bh 2/6 ··· (} 3)

  The maximum bending stress σmax is expressed by the following equation.

  σmax = M / Z (4)

  However, in the above-described formula deformation, only the main stress in the bridge portion 13 is considered and the equivalent stress is ignored. In the conventional rotor shown in FIG. 4, the maximum bending stress considering the equivalent stress is about twice the maximum bending stress considering only the main stress. However, this relationship is not necessarily limited to the number 2, and can be changed according to the shape of the rotor. Then, the maximum bending stress σmax is calculated by multiplying the maximum bending stress σmax shown in Equation (4) by the correction coefficient σ (here, 2). Therefore, the maximum bending stress σmax is expressed by the following equation.

  σmax = σM / Z (5)

  When the maximum bending stress σmax is generated in the bridge portion 13, the maximum bending stress σmax needs to be smaller than the yield point YP of the bridge portion 13 so that the rotor is not damaged. However, the rotor is usually designed so as to satisfy the following expression by introducing a safety factor Fs (for example, a value of 2 or more).

  Fs · σmax ≦ YP (6)

  When Expression (6) is transformed using Expressions (1) to (5), the following expression is derived.

^{Fs · L · mRω 2 / (} 2 · bh 2/6) ≦ YP ··· (7)

  That is, if the conventional rotor belongs to the range satisfying the equation (7), the rotor can be prevented from being damaged by centrifugal force. On the other hand, in the rotor shown in FIGS. 1 to 3, since the permanent magnet 30 is held by the member 52, the stress generated in the bridge portion 13 is reduced. Therefore, this rotor may belong to the range represented by the following formula.

^{Fs · L · mRω 2 / (} 2 · bh 2/6)> YP ··· (8)

  Note that m represents a set of masses of the permanent magnet 30 and the outer peripheral portion 12 in the rotor shown in FIGS. In addition, L is a set of mass centers of the permanent magnet 30 and the outer peripheral portion 12 from the point on the outer peripheral portion 12 side in the boundary between the bridge portion 13 and the rib portion 14 in the rotor shown in FIGS. The distance to a straight line parallel to the radial direction is shown. Therefore, the value shown on the left side of Equation (8) does not match the maximum bending stress generated in the bridge portion 13 shown in FIG. In the present rotor, as described above, since the stress generated in the bridge portion 13 can be reduced, the maximum bending stress actually generated in the bridge portion 13 even if the present rotor belongs to the range satisfying the equation (8). Is smaller than the value shown on the left side of the equation (8), and hence it is easy to make it smaller than the yield point YP. This content is also applied to other embodiments described later.

  In addition, when the rotor core 10 is an electromagnetic steel plate laminated in the axial direction, the maximum bending stress generated in the bridge portion 13 per electromagnetic steel plate and the yield point YP may be compared. Specifically, when the centrifugal force F is divided by the number of electromagnetic steel sheets and the section modulus of the bridge portion 13 is calculated, the axial height b of the rotor core 10 is replaced with the thickness b in the axial direction of the electromagnetic steel sheets. That's fine.

  The contents described below also apply to other embodiments. An electric motor (for example, a brushless DC motor) can be configured by arranging a stator from the opposite side of the rotation axis P to the rotor. FIG. 5 is a diagram showing an example of a conceptual configuration of such an electric motor. However, in FIG. 5, only one side of the electric motor in the cross section including the rotation axis P with respect to the rotation axis P is shown. The electric motor includes a stator having a rotor core 10 and a permanent magnet 30, a shaft 41, a stator 90, and a case 80. The shaft 41 is inserted into the shaft hole 40 of the rotor core 10. The rotor core 10 is fixed to the shaft 41 by shrink fitting, press fitting, welding, bolting, or the like. The stator 90 is disposed to face the rotor from the side opposite to the rotation axis P. The stator 90 is fixed to the case 80 by, for example, shrink fitting, press fitting, or welding. The stator 90 has a coil (not shown) wound around a tooth (not shown) by, for example, a concentrated winding method or a distributed winding method. When a current flows through the coil, the stator 90 supplies a rotating magnetic field to the rotor. The rotor rotates about the rotation axis P in response to the rotating magnetic field.

  This electric motor can be mounted on, for example, a relatively high-speed rotation type scroll compressor and turbo compressor. In these compressors, the centrifugal force generated in the rotor is relatively large because the rotor rotates at a relatively high speed. Therefore, the present rotor capable of reducing the stress generated in the bridge portion 13 due to the centrifugal force is suitable for these compressors.

  The electric motor may be mounted on a large capacity compressor such as a screw compressor. In such a large capacity compressor, since it is required to increase the diameter of the rotor, the centrifugal force generated in the rotor is relatively large. Therefore, this rotor capable of reducing the stress generated in the bridge portion 13 due to the centrifugal force is suitable for a large capacity compressor.

  When the electric motor is mounted on these compressors, the case 80 may be a sealed container that houses the compression mechanism.

  In a large capacity compressor, since the strength of the rotating magnetic field applied from the stator to the rotor is relatively large, the permanent magnet 30 is required to have a high demagnetization resistance. In order to realize such a demagnetization resistance, the thickness of the permanent magnet 30 in the radial direction may be increased. At this time, the volume of the permanent magnet 30 increases, and consequently the mass of the permanent magnet 30 increases. In the case of a conventional rotor, the mass of the permanent magnet 30 acts on the bridge portion 13 as a centrifugal force. In this rotor, the permanent magnet 30 is supported by the member 52 and the centrifugal force is transmitted to the bridge portion 13. To be suppressed. Therefore, as the mass of the permanent magnet 30 is heavier, the effect of reducing the stress generated in the bridge portion 13 is higher than that of the conventional rotor.

  Further, in the present rotor, an insertion hole 15 is provided in the outer peripheral portion 12, and a rivet or a bolt is inserted into the insertion hole 15, and the centrifugal force acting on the permanent magnet 30 or the outer peripheral portion 12 is supported by the rivet or the bolt. You don't have to. This is because the member 52 can support the centrifugal force acting on the permanent magnet 30. Thus, since it is not necessary to provide the penetration hole 15 in the outer peripheral part 12, you may reduce the area of the outer peripheral part 12 seen along the rotating shaft P. FIG. Therefore, even if the number of the field magnetic poles of the rotor is increased and the area of the outer peripheral portion 12 is reduced, there is no problem in terms of the stress caused by the centrifugal force. By increasing the number of field magnetic poles, the magnetic attractive force acting between the rotor and the stator 90 is dispersed, so that vibration and noise can be reduced. Therefore, it is particularly preferable to use the rotor core 10 in a large capacity compressor in which vibration and noise tend to increase.

Second embodiment.
The perspective view which shows an example of a notional structure of the rotor concerning 2nd Embodiment is the same as that of FIG. FIG. 6 shows an example of a conceptual configuration of the rotor in a cross section around the rotation axis P at a position passing through the rotor core 10. In FIG. 6, only a portion corresponding to one storage hole 20 in the rotor is shown.

  In the present rotor, a plurality of permanent magnets 31 and 32 are stored in one storage hole 20. In the example of FIG. 6, two permanent magnets 31 and 32 are stored side by side in the circumferential direction in one storage hole 20. The permanent magnets 31 and 32 stored in one storage hole 20 are stored with the magnetic pole surface 30a having the same polarity facing the outer peripheral side. Accordingly, the permanent magnets 31 and 32 stored in one storage hole 20 function as one field magnetic pole.

  A plurality (three in this case) of members 52 are inserted into one storage hole 20. The member 52 is a component of the end plate 50. FIG. 7 is a perspective view showing an example of a conceptual configuration of the end plate 50. The end plate 50 includes members 51 and 52, and the member 52 extends from the member 51.

  The two permanent magnets 30 are respectively held between a pair of adjacent members 52. In the illustration of FIG. 6, the member 52 located between the permanent magnets 31 and 32 in the circumferential direction sandwiches the permanent magnets 31 and 32 in the thickness direction together with the inner peripheral portion 11. Three members 52 sandwich the two permanent magnets 31 and 32 in the circumferential direction. In the illustration of FIG. 6, the member 52 positioned between the permanent magnets 31 and 32 has a shape in which a cross section perpendicular to the rotation axis P is T-shaped. The member 52 is fitted to the corners of the permanent magnets 31 and 32 that are adjacent to each other in the circumferential direction. The members 52 located on both sides of the pair of permanent magnets 31 and 32 are the same as the members 52 described with reference to FIG. Since the three members 52 inserted into one storage hole 20 sandwich the permanent magnets 31 and 32 in the circumferential direction, the permanent magnets 31 and 32 can be fixed in the circumferential direction.

  According to such a rotor, it is possible to suppress the centrifugal force acting on the permanent magnet 30 from being transmitted to the outer peripheral portion 12 by the member 52 separated from the outer peripheral portion 12 in the same manner as in the first embodiment. Accordingly, the stress generated in the bridge portion 13 can be reduced, and thus the bridge portion 13 having a small thickness in the radial direction can be employed.

  In the illustration of FIG. 6, all of the three members 52 inserted into one storage hole 20 are separated from the outer peripheral portion 12, but at least any one of them may be separated. Since the centrifugal force acting on the permanent magnet 30 is not transmitted through the member 52 spaced apart from the outer peripheral portion 12, the centrifugal force acting on the permanent magnet 30 is applied to the outer peripheral portion 12 as compared with the rotor not provided with the member 52. It is possible to suppress transmission.

  In addition, a plurality of permanent magnets 31 and 32 are inserted side by side in the circumferential direction with respect to one storage hole 20. Therefore, the length in the circumferential direction of the permanent magnets 31 and 32 is shorter than the mode (the mode of FIG. 2) in which the single permanent magnet 30 is inserted into the single storage hole 20. If the permanent magnets 30 to 32 are respectively supported by the members 52 on both sides in the circumferential direction, the stress generated in the permanent magnets 31 and 32 is smaller than the stress generated in the permanent magnet 30. This is considered because the bending stress generated in the permanent magnets 31 and 32 having a short length in the circumferential direction is lower than the bending stress generated in the permanent magnet 30 having a long length in the circumferential direction.

  Therefore, the displacement amount (deflection amount) of the permanent magnets 31 and 32 can be reduced. Although the permanent magnets 31 and 32 are deformed to the outer peripheral side by the centrifugal force generated in the permanent magnets 31 and 32, the displacement amount can be reduced, so that the possibility that the permanent magnets 31 and 32 are in contact with the outer peripheral portion 12 is reduced. Can do. Therefore, the force transmitted to the outer peripheral part 12 among the centrifugal forces acting on the permanent magnets 31 and 32 can be reduced, and consequently the stress generated in the bridge part 13 can be reduced.

Third embodiment.
The perspective view which shows an example of the notional structure of the rotor concerning 3rd Embodiment is the same as that of FIG. However, in the third embodiment, the end plates 50 and 60 are fixed to each other by existing fastening members (for example, rivets or bolts). Here, the members 51 and 52 do not constitute the rotor end plate 50. The end plate 50 is configured by the member 51 described in the first or second embodiment. However, the end plates 50 and 60 are respectively provided with through holes through which rivets or bolts are inserted.

  FIG. 8 shows an example of a conceptual configuration of the rotor in a cross section perpendicular to the rotation axis P at a position passing through the rotor core. The rotor shown in FIG. 8 has the same shape as the rotor shown in FIG. 2 except for the shape of the member 52.

  Unlike the first or second embodiment, the member 52 is an existing fastening member such as a rivet or a bolt. In the illustration of FIG. 8, the member 52 has a circular shape in a cross section perpendicular to the rotation axis P. As in the first or second embodiment, the member 52 sandwiches the permanent magnet 30 together with the inner peripheral portion 11 while being separated from the outer peripheral portion 12. Since the member 52 is supporting the permanent magnet 30 from the outer peripheral side while being separated from the outer peripheral portion 12, the force transmitted to the outer peripheral portion 12 among the centrifugal force acting on the permanent magnet 30 can be reduced. . Thereby, the stress applied to the bridge part 13 can be reduced. Therefore, even if a bridge portion having a small thickness in the radial direction is adopted as the bridge portion 13, the bridge portion 13 is hardly deformed. As the bridge portion 13 is thinner, the bridge portion 13 can reduce the short circuit between the permanent magnets 30 adjacent in the circumferential direction.

  If the member 52 is a non-magnetic material, it is desirable that the member 52 is positioned at the end of the permanent magnet 30 in the circumferential direction as illustrated in FIG. This is because the field magnetic flux generated at the center (pole center) in the circumferential direction of the permanent magnet 30 is larger than the end.

  As in the first or second embodiment, it is only necessary that at least one of the members 52 inserted into one storage hole 20 is separated from the outer peripheral portion 12. Also, a plurality of permanent magnets 30 may be stored in one storage hole 20 as in the second embodiment.

  Moreover, according to this rotor, since the existing fastening member, such as a rivet or a bolt, is used as the member 52, the manufacturing cost can be reduced.

Fourth embodiment.
The perspective view which shows an example of the notional structure of the rotor concerning 4th Embodiment is the same as that of FIG. FIG. 9 shows an example of a conceptual configuration of the rotor in a cross section perpendicular to the rotation axis P at a position passing through the rotor core 10. The shape of the rotor shown in FIG. 9 is the same as that of the rotor shown in FIG.

  The member 52 is sandwiching the permanent magnet 30 together with the inner peripheral portion 11 while being separated from the outer peripheral portion 12. The member 52 covers the permanent magnet 30 from the outer peripheral side. In other words, the entire magnetic pole surface 30 a on the outer peripheral side of the permanent magnet 30 faces the member 52 in the thickness direction of the permanent magnet 30.

  In the illustration of FIG. 9, the member 52 extends to the inner peripheral portion 11 side along the thickness direction on both sides in the circumferential direction of the permanent magnet 30. In other words, the member 52 sandwiches the permanent magnet 30 in the circumferential direction. Thereby, the permanent magnet 30 can be fixed in the circumferential direction.

  Even if a centrifugal force acts on the permanent magnet 30 due to the rotation of the rotor, the member 52 separated from the outer peripheral portion 12 supports the permanent magnet 30, thereby preventing the centrifugal force from being transmitted to the outer peripheral portion 12. it can. As a result, the stress which arises in the connection part 13 can be reduced.

  The member 52 supports the entire magnetic pole surface 30 a of the permanent magnet 30. Therefore, for example, as in the first or second embodiment, the stress generated in the permanent magnet 30 can be reduced as compared with the case where the permanent magnet 30 is supported at both ends in the circumferential direction of the permanent magnet 30. This is considered to be because bending stress is not generated in the permanent magnet 30 by supporting the permanent magnet 30 on the entire surface of the magnetic pole surface 30a.

  The member 52 is preferably a soft magnetic material (for example, iron). This is because as the thickness in the radial direction of the nonmagnetic material existing between the magnetic pole surface 30a on the outer peripheral side of the permanent magnet 30 and the outer peripheral portion 12 increases, the magnetic resistance increases and the field magnetic flux supplied by the rotor decreases. .

  If the member 52 is a soft magnetic material, the end plates 50 and 60 are preferably non-magnetic materials. As a result, the end plates 50 and 60 are in contact with the inner peripheral portion 11, and a pair of the end plates 50 and 60, the member 52 and the inner peripheral portion 11 structurally connects the magnetic pole surfaces 30 a and 30 b of the permanent magnet 30. Moreover, it can suppress that a magnetic flux short-circuits via the end plates 50 and 60, the member 52, and the inner peripheral part 11 between magnetic pole surface 30a, 30b.

  In addition, it is desirable that the width in the radial direction of the member 52 is thin enough that the member 52 is easily magnetically saturated with respect to the magnetic flux flowing in the axial direction. Thereby, it is possible to further suppress the magnetic flux from being short-circuited between the magnetic pole surfaces 30 a and 30 b of the permanent magnet 30 via the end plates 50 and 60, the member 52 and the inner peripheral portion 11.

Fifth embodiment.
FIG. 10 is a perspective view showing an example of a conceptual configuration of a rotor according to the fifth embodiment. In the present rotor, the rotor core 10 includes a plurality of core portions. In the illustration of FIG. 10, the rotor core 10 includes two core portions 10A and 10B. The core portions 10A and 10B are arranged to face each other in the axial direction.

  The configuration of the rotor in the cross section perpendicular to the rotation axis P at the positions passing through the core portions 10A and 10B is the same as the configuration of any of the rotors shown in FIGS. Hereinafter, as an example, the case where the configuration of the rotor in the cross section perpendicular to the rotation axis P at the positions passing through the core portions 10A and 10B is the same as the configuration of the rotor in FIG. 6 will be described.

  The core portions 10A and 10B are arranged with their positions in the circumferential direction shifted from each other. 11 and 12 are diagrams for explaining the positional relationship between the core portions 10A and 10B. 11 and 12, only the permanent magnets 31 and 32 and the members 52 and 72 are shown. The member 72 will be described later. In FIG. 11, in the core portion 10 </ b> A, a straight line (hereinafter referred to as a reference) that connects a pair of permanent magnets 31 and 32 that constitute one field magnetic pole in the circumferential direction (between poles) and a rotation axis P. Are called dashed lines). In FIG. 12, the reference line in the core portion 10B is indicated by a one-dot broken line. In FIG. 12, the reference line in the core portion 10A is indicated by a broken line. As can be understood from FIG. 12, the reference lines in the core portions 10 </ b> A and 10 </ b> B are shifted in the circumferential direction by an angle x (hereinafter referred to as a skew angle) with the rotation axis P as the center. In other words, the core portions 10A and 10B are arranged so that their positions in the circumferential direction are shifted from each other by the skew angle x.

  By appropriately setting the skew angle x, in a rotating electrical machine using the present rotor, it is possible to reduce high-order harmonic components of vibration of the rotor. More specifically, the skew angle x is set so as to satisfy the following equation, for example, using the number of pairs of magnetic poles (number of pole pairs) P of the rotor and the n-order harmonic component to be reduced. Thereby, the n-order harmonic component of vibration can be reduced.

  x = 360 / (2Pn) (9)

  Referring to FIG. 10, the rotor includes rotor end plates 50, 60 and 70. For example, the rotor end plate 50 is provided on the core portion 10A on the opposite side of the core portion 10B in the axial direction. The rotor end plate 60 is provided on the core portion 10B on the opposite side of the core portion 10A in the axial direction. The rotor end plate 70 is provided between the core portions 10A and 10B. Since the rotor end plate 60 is the same as that described in the first to fourth embodiments, the description thereof is omitted.

  FIG. 13 is a perspective view showing an example of a conceptual configuration of the rotor end plates 50, 60, 70. The rotor end plate 50 has the same configuration as the rotor end plate 50 of FIG. However, the member 52 sandwiches the permanent magnets 31 and 32 included in the core portion 10A together with the inner peripheral portion 11 included in the core portion 10A while being separated from the outer peripheral portion 12 included in the core portion 10A (see also FIGS. 6 and 11).

  The rotor end plate 70 includes members 71 and 72. The rotor end plate 70 has the same configuration as the rotor end plate 50. The members 71 and 72 have the same shape as the members 51 and 52, respectively. The member 71 is provided between the core portions 10A and 10B. The member 72 extends from the member 71 and sandwiches the permanent magnets 31 and 32 included in the core portion 10B together with the inner peripheral portion 11 included in the core portion 10B while being separated from the outer peripheral portion 12 included in the core portion 10B (FIG. 6). See also FIG.

  Since the core portions 10A and 10B are disposed so that their positions in the circumferential direction are shifted from each other by the skew angle x, the members 52 and 72 are also shifted from each other in the circumferential direction by the skew angle x.

  When the rotor rotates about the rotation axis P, the permanent magnets 31 and 32 included in the core portions 10A and 10B are supported by the members 52 and 72. Therefore, the stress which arises in the bridge part 13 which 10 A of core parts and 10B have similarly to 2nd Embodiment can be reduced.

  The member 72 may extend from the rotor end plate 60. Further, the members 52 and 72 may extend from the member 71. In this case, an existing rotor end plate can be used as the member 51. The invitation of this effect does not depend on the presence or absence of skew. Further, as in the first embodiment, the member 52 may be connected to the member 71 and the member 72 may be connected to the rotor end plate 60. Thereby, since the strength of the members 52 and 72 can be improved, it is possible to suppress the permanent magnets 31 and 32 from being bent and coming into contact with the outer peripheral portion.

  Further, the rotor may have three or more core portions, and the skew angle between the adjacent core portions may be made different based on Expression (9). Thereby, a plurality of different high-order harmonic components regarding the vibration of the rotor can be reduced.

DESCRIPTION OF SYMBOLS 10 Rotor core 11 Inner peripheral part 12 Outer peripheral part 13 Connection part 20 Storage hole 30-32 Permanent magnet 50, 60, 70 End plate 51, 52, 71, 72 Member P Rotating shaft

Claims (9)

A plurality of permanent magnets (30-32) arranged in a ring around the rotation axis (P);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes A rotor core having a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction around the rotating shaft. An end plate (50) provided on at least one side in the axial direction along the rotation axis with respect to the rotor,
A first member (51) provided on the one side in the axial direction with respect to the rotor;
An end plate for a rotor, comprising: a plurality of second members (52) extending from the first member and being spaced apart from the outer peripheral portion and sandwiching the plurality of permanent magnets together with the inner peripheral portion.   The second member (52) sandwiches the permanent magnet together with the inner peripheral portion (11) only on both sides of the permanent magnet (30 to 32) in the circumferential direction around the rotation axis (P). The rotor end plate according to claim 1, wherein a plurality of the permanent magnets are stored side by side in the circumferential direction in the storage hole.   The rotor end plate according to claim 1, wherein the second member (52) covers the permanent magnet.   The rotor end plate according to any one of claims 1 to 3, wherein at least one of the first member (51) and the second member (52) is nonmagnetic. The plurality of permanent magnets (30 to 32);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes The rotor core (10) having a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction around the rotating shaft. )When,
The rotor end plate (50) according to any one of claims 1 to 4,
A second rotor end plate provided on the opposite side of the rotor end plate in the axial direction;
The second member (52) is a rotor that connects and fixes the first member (51) and the second rotor end plate to each other. The plurality of permanent magnets (30 to 32);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes The rotor core (10) having a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction around the rotating shaft. )When,
The rotor end plate (50) according to any one of claims 1 to 4,
A rotor having a gap between the outer peripheral portion (12) and the permanent magnet (30). The plurality of permanent magnets (30 to 32);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes A core portion (10A, 10B) including a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction centering on the rotating shaft. The rotor core (10), wherein the plurality of core portions face each other in the axial direction, and the plurality of core portions are displaced from each other in the circumferential direction;
A plurality of the rotor end plates (50, 70) according to any one of claims 1 to 4,
In each of the core portions, one of the first members is adjacent to one side in the axial direction, and one of the second members extending from the one of the first members is the one of the first members. The one core part has the inner peripheral part of the one core part while being separated from the outer peripheral part of the one core part (10A) adjacent on the other side in the axial direction. A rotor with multiple permanent magnets. The plurality of permanent magnets (30 to 32);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes The rotor core (10) having a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction around the rotating shaft. )When,
The rotor end plate (50) according to any one of claims 1 to 4,
A set of masses of the permanent magnet (30) and the outer peripheral portion (12) is m, and a distance between the set of mass centers of the permanent magnet and the outer peripheral portion and the rotation shaft (P) is R, the angular velocity at the maximum rotational speed of the rotor core is ω, the distance from the connecting portion (13) to a straight line passing through the center of mass and parallel to the radial direction about the rotating shaft is L, the connecting When the section modulus in the cross section formed by the axial direction and the radial direction of the portion (13) is Z, the safety factor is Fs, the correction coefficient is σ, and the yield point of the connecting portion is YP,
σ · Fs · L · mRω ² / (2Z)> YP
Meet the rotor. The plurality of permanent magnets (30 to 32);
A plurality of storage holes (20) for storing at least one of the permanent magnets are formed, and an inner peripheral portion (11) existing on the rotating shaft side with respect to the storage holes, and the rotation with respect to the storage holes A core portion (10A, 10B) including a plurality of outer peripheral portions (12) existing on the opposite side of the shaft and a connecting portion (13) for connecting the outer peripheral portions to each other in a circumferential direction centering on the rotating shaft. And a support member (70; 71, 72) that supports the permanent magnet with respect to a rotor that includes the rotor core (10) with the two core portions facing each other in the axial direction. , 52),
A first member (71) provided between the core parts;
The plurality of permanents that the one core part has together with the inner peripheral part that the one core part has while extending from the first member and being separated from the outer peripheral part that the one core part has. A plurality of second members (52) sandwiching the magnets, and the inner peripheral portion of the second core portion while being separated from the outer peripheral portion of the second core portion, extending from the first member A permanent magnet support member comprising a plurality of third members (72) sandwiching the plurality of permanent magnets of the two core portions.

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