JP2014158330A - Rotor of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor of a dynamo-electric machine in which the bulge of an outer periphery side rotor core and an inner periphery side rotor core to the outer side can be suppressed.SOLUTION: A rib 70 includes an inner periphery side rib 80 having a first inner periphery side rib 82 and a second inner periphery side rib 84 extending, respectively, to one side in the circumferential direction and the other side in the circumferential direction, from an inner periphery side rotor core 25 toward an outer periphery side rotor core, and an inner periphery side connection 86 interconnecting the outer periphery side end of the first inner periphery side rib 82 and the outer periphery side end of the second inner periphery side rib 84, an outer periphery side rib 90 having a first outer periphery side rib 92 and a second outer periphery side rib 94 extending, respectively, to one side in the circumferential direction and the other side in the circumferential direction, from an outer periphery side rotor core 26 toward an inner periphery side rotor core 25, and an outer periphery side connection 96 interconnecting the inner periphery side end of the first outer periphery side rib 92 and the inner periphery side end of the second outer periphery side rib 94, and a connection rib 72 connecting the inner periphery side connection 86 and outer periphery side connection 96.

Description

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

  Conventionally, as a rotor used in a rotating electrical machine, a rotor core in which a plurality of permanent magnets are arranged at predetermined intervals in the circumferential direction is known (see, for example, Patent Documents 1 and 2).

  As shown in FIG. 12, the rotor 100 of Patent Document 1 connects an inner peripheral portion 103 that surrounds the shaft press-fitting hole 102, a plurality of ribs 104 that extend outward from the inner peripheral portion 103, and the tips of the ribs 104. And a rotor core 101 including an outer peripheral portion 105.

  Here, the plurality of ribs 104 are inclined by a predetermined angle in the circumferential direction, and are formed in a so-called windmill shape. With this configuration, the occurrence of distortion of the rib 104 in the axial direction is suppressed.

  As shown in FIG. 13, the rotor 221 of Patent Document 2 has a rotor core 222. The rotor core 222 includes an outer peripheral portion 222b, an inner peripheral portion 222c, and the outer peripheral portion 222b and the inner peripheral portion 222c. And a plurality of ribs 222d to be connected. Further, the rotor core 222 has a rotating shaft 224 fitted and fixed in a shaft hole 222a at the center, and a plurality of permanent magnets 226 are bonded and fixed to the outer peripheral surface.

  Here, the plurality of ribs 222d are arranged so as to be inclined by an angle α in opposite directions in the circumferential direction so that the adjacent ribs 222d are symmetric. In this way, by forming the plurality of ribs 222d to have a so-called spoke shape, the strength of the ribs 222d is improved, the width of the ribs 222d is narrowed (thinned), and the weight of the rotor core 222 is reduced. I am trying.

Japanese Patent No. 3746885 JP 2004-194419 A

  By the way, in Patent Document 1, when a shaft (not shown) is press-fitted and fixed in the shaft press-fitting hole 102, the inner peripheral portion 103 of the rotor core 101 is displaced from the central portion toward the outer peripheral side (press-fit displacement). There is a risk that stress (pressing stress) is transmitted to the outer peripheral portion 105 through the outer peripheral portion 105 and the outer peripheral portion 105 swells toward the outer peripheral side. Here, the plurality of ribs 104 have a so-called windmill shape as described above, and are relatively low in rigidity, so that they are easily deformed, and the press-fitting displacement of the inner peripheral portion 103 of the rotor core 101 is absorbed by the ribs 104. It is possible to suppress an excessive press-fitting stress from acting on the outer peripheral portion 105.

  In addition, the rigidity of the plurality of ribs 104 is set low, so that the inner peripheral portion 103 and the outer peripheral portion 105 approach a state where they are mechanically separated. Therefore, a large centrifugal force acting on the outer peripheral portion 105 during rotation is difficult to be transmitted to the inner peripheral portion 103 via the rib 104, and the inner peripheral portion 103 is suppressed from bulging to the outer peripheral side.

  However, since the rigidity of the rib 104 is low, a large centrifugal force acts on the outer peripheral portion 105, that is, a large force that pulls the outer peripheral portion 105 toward the outer peripheral side acts. It will expand greatly. As a result, a large stress (centrifugal stress) due to deformation is generated in the outer peripheral portion 105.

  On the other hand, by applying the spoke-shaped rib 222d described in Patent Document 2 with a relatively high rigidity, the outer periphery of the outer peripheral portion 222b against a large force pulling the outer peripheral portion 105 toward the outer peripheral side. It is conceivable to reduce the centrifugal stress acting on the outer peripheral portion 222b of the rotor core 222 by suppressing the bulge to the side.

  However, when the rigidity of the rib 222d is simply increased, in the configuration in which the shaft is press-fitted into the rotor core, the rib 222d is difficult to be deformed during press-fitting, so the press-fitting displacement of the inner peripheral part 222c cannot be absorbed, and the outer peripheral part 222b. There is a possibility that excessive press-fitting stress acts on the surface.

  Further, when the rigidity of the rib 222d is simply increased, the inner peripheral portion 222c and the outer peripheral portion 222b approach a state where they are mechanically connected. Therefore, the centrifugal force acting on the outer peripheral portion 222b during rotation causes the rib 222d to There is a possibility that the inner peripheral portion 222c may bulge to the outer peripheral side. In this case, since the shaft hole 222a also swells to the outer peripheral side, the slip toughness with respect to the rotating shaft 224 is reduced.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotor of a rotating electrical machine that can suppress swelling of the outer peripheral side rotor core and the inner peripheral side rotor core toward the outer peripheral side.

In order to achieve the above-mentioned object, the invention according to claim 1
A substantially annular rotor core (for example, the rotor core 20 of the embodiment described later) having a plurality of magnet insertion holes (for example, a magnet insertion hole 40 of the embodiment described later) formed at predetermined intervals in the circumferential direction;
A permanent magnet inserted into the magnet insertion hole (for example, a permanent magnet 30 in an embodiment described later);
A rotary shaft that is press-fitted into a shaft hole (for example, a shaft hole 22 in an embodiment described later) formed in the center of the rotor core;
A rotor of a rotating electrical machine (e.g., rotors 10 and 10A in embodiments described later),
The rotor core includes a substantially annular through hole (for example, a through hole 24 in an embodiment described later) penetrating in the axial direction on the inner peripheral side of the magnet insertion hole, and an inner peripheral rotor core on the inner peripheral side of the through hole. (For example, an inner peripheral side rotor core 25 in an embodiment described later) and an outer peripheral side rotor core on the outer peripheral side of the through hole (for example, an outer peripheral side rotor core 26 in an embodiment described later),
The inner circumferential rotor core and the outer circumferential rotor core are connected by a plurality of ribs (for example, ribs 70 in an embodiment described later) arranged at predetermined intervals in the circumferential direction.
The rib is
A first inner circumferential rib (for example, a first inner circumferential rib 82 in an embodiment described later) and a first extending in the circumferential direction one side and the circumferential direction other side from the inner circumferential rotor core toward the outer circumferential rotor core. 2 inner peripheral ribs (for example, a second inner peripheral rib 84 in an embodiment described later), an outer peripheral end of the first inner peripheral rib, and an outer peripheral end of the second inner peripheral rib. An inner circumferential side rib (for example, an inner circumferential side rib 80 in an embodiment described later) having inner circumferential side coupling portions (for example, an inner circumferential side coupling portion 86 in an embodiment described later) coupled to each other;
A first outer peripheral rib (for example, a first outer peripheral rib 92 in an embodiment described later) and a second outer periphery that extend toward one side in the circumferential direction and the other side in the circumferential direction from the outer peripheral side rotor core toward the inner peripheral side rotor core. A side rib (for example, a second outer peripheral side rib 94 in an embodiment described later), an inner peripheral end of the first outer peripheral rib, and an inner peripheral end of the second outer peripheral rib are connected to each other. An outer peripheral side rib (for example, an outer peripheral side rib 90 of an embodiment described later) having an outer peripheral side connection portion (for example, an outer peripheral side connection portion 96 of an embodiment described later),
A connecting portion that connects the inner peripheral side connecting portion and the outer peripheral side connecting portion (for example, a connecting rib 72 in an embodiment described later);
With
A narrow angle formed by the first outer peripheral rib and the second outer peripheral rib toward the outer peripheral side (for example, a narrow angle α in an embodiment described later), the first inner peripheral rib, and the second inner peripheral The narrow angle formed by the side ribs toward the inner peripheral side (for example, the narrow angle β in the embodiment described later) is different in size.

In addition to the configuration of claim 1, the invention according to claim 2
The connecting portion is constituted by a connecting rib that extends and connects the inner peripheral side connecting portion and the outer peripheral side connecting portion in the radial direction.

In addition to the configuration of claim 1 or 2, the invention according to claim 3
The narrow angle formed by the first outer peripheral rib and the second outer peripheral rib toward the outer peripheral side is the narrow angle formed by the first inner peripheral rib and the second inner peripheral rib toward the inner peripheral side. It is characterized by being larger than the corner.

In addition to the configuration of any one of claims 1 to 3, the invention according to claim 4
The connecting portion is formed so as to be closer to a radial intermediate portion of the through hole (for example, a radial intermediate portion M in an embodiment described later) than the outer peripheral rotor core and the inner peripheral rotor core in the radial direction. It is characterized by being.

In addition to the structure of any one of Claims 1-4, the invention which concerns on Claim 5 is
The outer peripheral side end portion of the first outer peripheral side rib constituting the outer peripheral side rib is the second outer peripheral side rib constituting the other outer peripheral side rib adjacent in the circumferential direction at the connection position with the outer peripheral side rotor core. Connected to the outer peripheral side end of the
The inner peripheral side end of the first inner peripheral side rib constituting the inner peripheral side rib constitutes the other inner peripheral side rib adjacent in the circumferential direction at the connection position with the inner peripheral side rotor core. It is connected with the inner peripheral side end of the second inner peripheral rib.

According to the first aspect of the present invention, during rotation, the centrifugal force acting on the rotor core itself causes a force to pull the outer circumferential rotor core toward the outer diameter side. Since each of the ribs is deformed to bend, it is suppressed that a relatively large centrifugal force acting on the outer rotor core is transmitted to the inner rotor core via the outer rib, the connecting portion, and the inner rib. Swelling of the inner circumferential rotor core is suppressed. Thereby, the swelling of a shaft hole is suppressed and it becomes possible to suppress the fall of slip torque.
Further, when the rotary shaft is press-fitted into the shaft hole of the rotor core, the inner peripheral rotor core is displaced from the central portion toward the outer peripheral side (press-fit displacement occurs). However, since the inner peripheral rib and the outer peripheral rib are deformed so that the inner peripheral rib and the outer peripheral rib are deformed, the press-fitting displacement is absorbed by the inner peripheral rib and the outer peripheral rib, so that the press-fitting displacement generated in the outer peripheral rotor core can be reduced. It is possible to suppress the press-fitting stress generated in the outer rotor core.
A narrow angle formed by the first outer peripheral rib and the second outer peripheral rib toward the outer peripheral side, and a narrow angle formed by the first inner peripheral rib and the second inner peripheral rib toward the inner peripheral side. Are formed in different sizes, so that the strength and ease of deformation of the outer and inner ribs can be adjusted to the desired characteristics, respectively, resulting from centrifugal force (centrifugal stress) It is possible to form the outer peripheral side rib and the inner peripheral side rib so as to suppress the increase of the bulge to the outer peripheral side of the inner peripheral surface of the inner peripheral side rotor core while suppressing the expansion to the outer peripheral side of the outer peripheral side rotor core. Become.

According to the invention of claim 2, the connecting portion is constituted by the connecting rib that extends and connects the inner peripheral side connecting portion and the outer peripheral side connecting portion in the radial direction, whereby the length or the arrangement position of the connecting rib. Is appropriately set, and the narrow angle formed by the first inner rib and the second inner rib and the first outer rib and the first rib without changing the interval between the ribs adjacent in the circumferential direction. The narrow angle formed by the two outer ribs can be set to a desired size.
Therefore, by appropriately setting the length or the arrangement position of the connecting rib according to the characteristics of the magnetic circuit such as the size of the permanent magnet and the position of the magnet insertion hole, it can be deformed while maintaining an appropriate strength. It can be set as an outer peripheral side rib and an inner peripheral side rib.

  According to the invention of claim 3, the narrow angle formed by the first outer peripheral side rib and the second outer peripheral side rib toward the outer peripheral side, and the first inner peripheral side rib and the second inner peripheral side rib are the inner peripheral side. By setting the angle larger than the narrow angle toward the surface, the space between the adjacent ribs in the circumferential direction can be efficiently utilized to extend the outer rib and further facilitate the deformation of the outer rib. Can do. Therefore, relatively large centrifugal force acting on the outer peripheral side rotor core is difficult to be transmitted to the connecting portion, the inner peripheral side rib, and the inner peripheral side rotor core via the outer peripheral side rib, thereby further suppressing the swelling of the inner peripheral side rotor core. This makes it possible to further suppress the decrease in slip torque.

  According to invention of Claim 4, since a connection part is formed so that it may become near the radial direction intermediate part of a through-hole rather than an outer peripheral side rotor core and an inner peripheral side rotor core in radial direction, It becomes easy to ensure the length in the radial direction of the outer peripheral side rib. Therefore, when the rotary shaft is press-fitted into the shaft hole of the rotor core, deformation of the inner peripheral rib and the outer peripheral rib when the inner peripheral rotor core is displaced from the central portion toward the outer peripheral side is hindered by the connecting portion. Can be suppressed. Therefore, even when the connecting portion is formed, deformation of the inner peripheral rib and the outer peripheral rib can be easily maintained.

According to invention of Claim 5, the outer peripheral side edge part of the 1st outer peripheral side rib which comprises an outer peripheral side rib is the 1st outer peripheral side rib which comprises the other outer peripheral side rib adjacent to the circumferential direction in a connection position with an outer peripheral side rotor core. 2 The inner peripheral end of the first inner peripheral rib that is connected to the outer peripheral end of the outer peripheral rib and constitutes the inner peripheral rib is adjacent to the circumferential direction at the connection position with the inner peripheral rotor core. It connects with the inner peripheral side edge part of the 2nd inner peripheral side rib which comprises this inner peripheral side rib. Therefore, the first outer peripheral side rib and the second outer peripheral side rib can be formed to have a longer circumferential length than when the outer peripheral end portions are not connected to each other, and the first inner peripheral side rib and the second inner peripheral side rib are Compared to the case where the inner peripheral side ends are not connected to each other, the circumferential length can be made longer, so that the outer peripheral rib and the inner peripheral rib can be more easily deformed when the rotary shaft is press-fitted into the shaft hole of the rotor core. Therefore, the press-fit stress generated in the outer rotor core can be reduced more effectively.
In addition, when centrifugal force acts on the rotor core during rotation of the rotor, deformation of the inner and outer ribs can be further facilitated against the force pulling the rotor core toward the outer diameter side. The relatively large centrifugal force acting on the outer rotor core becomes difficult to be transmitted to the inner rotor core via the outer rib, connecting portion, and inner rib, and the swelling of the inner rotor core is further suppressed. .

It is a front view of the rotor which concerns on 1st Embodiment. It is the elements on larger scale of the rotor of FIG. It is a displacement figure of the rotor core concerning a 1st embodiment. (A) is a front view of the rotor which concerns on the comparative example 1, (b) is a displacement figure of a rotor core. (A) is a front view of the rotor which concerns on the comparative example 2, (b) is a displacement figure of a rotor core. It is a figure which shows the amount of swelling to the outer peripheral side of the inner peripheral surface of an inner peripheral side rotor core, and the outer peripheral surface of an outer peripheral side rotor core. It is a front view of the rotor which concerns on 2nd Embodiment. It is the elements on larger scale of the rotor of FIG. It is a figure which shows the amount of swelling to the outer peripheral side of the inner peripheral surface of an inner peripheral side rotor core, and the outer peripheral surface of an outer peripheral side rotor core. 10 is a front view of a rotor according to Comparative Example 3. FIG. It is the elements on larger scale of the rotor of FIG. It is a front view of the rotor concerning patent documents 1. 10 is a front view of a rotor according to Patent Document 2. FIG.

  Hereinafter, a rotor of a rotating electrical machine according to each embodiment of the present invention will be described.

(First embodiment)
As shown in FIGS. 1 and 2, the rotor 10 of the rotating electrical machine according to the first embodiment includes a substantially annular rotor core 20 having a plurality of magnetic pole portions 50 formed at predetermined intervals in the circumferential direction, and a rotor core 20. A rotating shaft (not shown) that is press-fitted into a shaft hole 22 formed in the center, and is arranged on the inner peripheral side of the stator (not shown). In FIG. 1, the symbol O is the center of the rotor 10.

  The rotor core 20 is formed by laminating a large number of annular electromagnetic steel plates, for example, silicon steel plates 21, having substantially the same shape, and a plurality of magnet insertion holes 40 are formed at predetermined intervals in the circumferential direction.

  The magnetic pole part 50 is configured such that the permanent magnet 30 is inserted into the magnet insertion hole 40 so as to be magnetized in the radial direction and to have different magnetization directions alternately in the circumferential direction. More specifically, in the magnetic pole portion 50A configured by inserting the permanent magnet 30A into the magnet insertion hole 40, if the outer peripheral side is an N pole, the adjacent magnetic pole portion 50B is an S pole on the outer peripheral side. The permanent magnet 30B is configured to be inserted into the magnet insertion hole 40.

  The permanent magnet 30 is composed of three permanent magnet pieces 32a, 32b, and 32c divided into three in the circumferential direction, and these three permanent magnet pieces 32a, 32b, and 32c are formed in a substantially rectangular shape with the same cross section. The

  The magnet insertion hole 40 includes three holes 42a, 42b, and 42c that are divided into three in the circumferential direction, and permanent magnet pieces 32a, 32b, and 32c are provided in the three holes 42a, 42b, and 42c, respectively. Inserted and fixed. The three holes 42a, 42b, 42c are formed in a substantially V shape so that the outer peripheral surfaces of the permanent magnet pieces 32a, 32b, 32c adjacent in the circumferential direction form an angle of less than 180 °.

  The rotor core 20 has a side barrier portion 60 (see FIG. 2) that penetrates in the axial direction and forms a magnetic gap in a portion adjacent to the circumferential outer end face 32d of the permanent magnet pieces 32a and 32c. . Thus, by forming the side barrier portion 60 in the rotor core 20, the circumferential rib 23 extending in the circumferential direction is provided between the side barrier portion 60 and the outer peripheral surface 20a of the rotor core 20.

  Here, since the circumferential rib 23 is formed with a relatively short radial width, the magnetic flux generated from the outer circumferential surface of the permanent magnet 30 is short-circuited to the inner circumferential surface of the same permanent magnet 30 via the circumferential rib 23. Or short-circuiting to the inner peripheral surface of the permanent magnet 30 constituting the adjacent magnetic pole portion 50 via the circumferential rib 23 is suppressed.

  Further, the rotor core 20 is formed with a substantially annular through hole 24 penetrating in the axial direction on the inner peripheral side of the magnet insertion hole 40. The through hole 24 is formed so that the outer peripheral surface 24 a and the inner peripheral surface 24 b are parallel to the outer peripheral surface 20 a of the rotor core 20 and the shaft hole 22. Thus, the rotor core 20 has the inner circumferential rotor core 25 on the inner circumferential side of the through hole 24 and the outer circumferential rotor core 26 on the outer circumferential side of the through hole 24 by forming the through hole 24. Become.

  The inner circumferential side rotor core 25 and the outer circumferential side rotor core 26 are connected by a plurality of ribs 70 arranged at predetermined intervals in the circumferential direction. The rib 70 connects the inner peripheral side rib 80 extending from the inner peripheral side rotor core 25 to the outer peripheral side, the outer peripheral side rib 90 extending from the outer peripheral side rotor core 26 to the inner peripheral side, and the inner peripheral side rib 80 and the outer peripheral side rib 90. And connecting ribs 72 (connecting portions).

  The inner circumferential rib 80 extends substantially linearly from the inner circumferential rotor core 25 toward the outer circumferential rotor core 26 and extends to one circumferential side (right side in FIG. 2) and the other circumferential side (left side in FIG. 2). Of the first inner peripheral rib 82 and the second inner peripheral rib 84, and the outer peripheral end of the first inner peripheral rib 82 and the outer peripheral end of the second inner peripheral rib 84 are connected to each other. A circumferential connection portion 86.

  The outer peripheral ribs 90 are substantially straight first outer peripheral ribs 92 and second outer peripheral ribs 94 extending from the outer peripheral rotor core 26 toward the inner peripheral rotor core 25, respectively, extending in one circumferential direction and the other circumferential direction. And an outer peripheral side connecting portion 96 in which the inner peripheral end of the first outer peripheral rib 92 and the inner peripheral end of the second outer peripheral rib 94 are connected to each other.

  The connecting rib 72 connects the inner peripheral side connecting portion 86 and the outer peripheral side connecting portion 96 by extending in the radial direction. Here, the connecting rib 72 is formed in the radial direction so as to be closer to the radial intermediate portion M of the through-hole 24 than the outer circumferential rotor core 26 and the inner circumferential rotor core 25. That is, the radially intermediate portion between the outer circumferential rotor core 26 and the radial intermediate portion M of the through hole 24 is defined as the outer circumferential intermediate portion M1, and the radial intermediate portion between the inner circumferential rotor core 25 and the radial intermediate portion M of the through hole 24. When the portion is the inner peripheral side intermediate portion M2, the connecting rib 72 is formed so as to be positioned between the outer peripheral side intermediate portion M1 and the inner peripheral side intermediate portion M2 in the radial direction. With this configuration, it is easy to secure the radial lengths of the inner peripheral side rib 80 and the outer peripheral side rib 90.

  Further, the outer peripheral side end portion of the first outer peripheral rib 92 constituting the outer peripheral side rib 90 is the second outer peripheral side constituting the other outer peripheral side rib 90 adjacent in the circumferential direction at the connection position with the outer peripheral side rotor core 26. It is connected to the outer peripheral side end of the rib 94 and is contact-coupled. Further, the inner peripheral side end portion of the first inner peripheral side rib 82 constituting the inner peripheral side rib 80 constitutes another inner peripheral side rib 80 adjacent in the circumferential direction at the connection position with the inner peripheral side rotor core 25. The second inner peripheral side rib 84 is connected to the inner peripheral side end, and is contact-coupled. That is, in this embodiment, the ribs 70 adjacent to each other in the circumferential direction are closely arranged without a gap. Thereby, the circumference length of each outer peripheral side rib 90 and the inner peripheral side rib 80 can be ensured long.

  Here, the narrow angle α formed by the first outer peripheral rib 92 and the second outer peripheral rib 94 toward the outer peripheral side, and the first inner peripheral rib 82 and the second inner peripheral rib 84 are formed on the inner peripheral side. The narrow angle β is set to have a different size (α ≠ β), and in this embodiment, the narrow angle α is set to be larger than the narrow angle β (α> β). Therefore, the outer rib 90 is less rigid than the inner rib 80 and is easily deformed.

  Thus, the strength and ease of deformation of the outer peripheral rib 90 and the inner peripheral rib 80 are adjusted to desired characteristics by appropriately setting the narrow angles α and β, respectively, and centrifugal force (centrifugal stress) ), The bulge to the outer peripheral side of the inner peripheral surface of the inner peripheral rotor core 25 can be suppressed while the bulge to the outer peripheral side of the outer peripheral rotor core 26 due to the above is suppressed.

  Next, in order to compare the rotor core 20 according to the first embodiment and the rotor cores 320 and 420 according to Comparative Examples 1 and 2, the displacement of the rotor cores 20, 320, and 420 during the rotation was analyzed.

  As shown in FIG. 4A, the rotor core 320 according to the comparative example 1 has the same basic configuration as the rotor core 20 according to the first embodiment, and ribs that connect the inner circumferential rotor core 25 and the outer circumferential rotor core 26. The configuration of is different. The plurality of ribs 370 according to the comparative example 1 are inclined so as to extend toward one side in the circumferential direction (clockwise in FIG. 4A) from the inner circumferential rotor core 25 toward the outer circumferential rotor core 26. The shape is formed and the rigidity thereof is relatively low.

  As shown in FIG. 5 (a), the rotor core 420 according to the comparative example 2 has the same basic configuration as the rotor core 20 according to the first embodiment, similarly to the rotor core 320 according to the comparative example 1. The structure of the rib which connects the rotor core 25 and the outer peripheral side rotor core 26 differs. The rib 470 according to the comparative example 2 includes a first rib 472 extending in the radial direction from the inner peripheral rotor core 25, and extending in the radial direction from the outer peripheral end of the first rib 472. The second rib 474 and the third rib 476 are configured to extend incline toward the side and are connected to the outer rotor core 26. Therefore, the plurality of ribs 470 have a so-called spoke shape, and the rigidity thereof is relatively high.

  FIG. 3, FIG. 4 (b), and FIG. 5 (b) show the results obtained by simulation for the displacement of the rotor cores 20, 320, and 420 of the first embodiment, comparative example 1, and comparative example 2 during rotation. Has been. In the drawing, the solid line indicates the rotor core 20, 320, 420 before rotation and the broken line indicates the rotor core 20, 320, 420 being rotated. Further, FIG. 6 shows the bulge amounts of the inner peripheral surface (shaft hole 22) of each inner peripheral rotor core 25 and the outer peripheral surface (outer peripheral surface 20a) of the outer peripheral rotor core 26 toward the outer peripheral side. In FIG. 6, the amount of swelling of the inner circumferential surface of the inner circumferential side rotor core 25 and the amount of swelling of the outer circumferential surface of the outer circumferential side rotor core 26 are represented by two vertical axes having different scales.

  From FIG. 3 to FIG. 6, the amount of swelling toward the outer peripheral side of the inner peripheral surface of the inner rotor core 25 is the first embodiment <Comparative Example 2 <Comparative Example 1, and the outer peripheral surface of the outer rotor core 26 is It can be seen that the amount of swelling toward the outer peripheral side is Comparative Example 1 <First Embodiment <Comparative Example 2.

  Here, the bulge amount of the outer peripheral surface of the outer peripheral side rotor core 26 in Comparative Example 1 and the bulge amount of the inner peripheral surface of the inner peripheral side rotor core 25 in Comparative Example 2 are very large values, and the rotor operation is performed. May have adverse effects. On the other hand, in the first embodiment, both bulge amounts are reduced in a well-balanced manner. The reason for this result is discussed below.

  In the rotor core 320 of the comparative example 1, since the rigidity of the rib 370 is relatively low, the inner peripheral rotor core 25 and the outer peripheral rotor core 26 approach the state of being mechanically separated, so that the outer peripheral rotor core 26 is rotated during rotation. The acting large centrifugal force is difficult to be transmitted to the inner circumferential rotor core 25 via the ribs 370, and the inner circumferential rotor core 25 is suppressed from bulging to the outer circumferential side. However, since the rigidity of the rib 370 is low, a large centrifugal force acts on the outer rotor core 26, and the outer rotor core 26 swells greatly toward the outer periphery. As a result, a large centrifugal stress due to the deformation is generated in the outer rotor core 26.

  Further, in the rotor core 420 of Comparative Example 2, since the rigidity of the rib 470 is relatively high, swelling of the outer peripheral rotor core 26 toward the outer peripheral side is suppressed, and centrifugal stress acting on the outer peripheral rotor core 26 is reduced. However, since the inner circumferential rotor core 25 and the outer circumferential rotor core 26 approach a state where they are mechanically connected, the centrifugal force acting on the outer circumferential rotor core 26 during rotation is applied to the inner circumferential rotor core 25 via the ribs 470. As a result, the inner circumferential rotor core 25 swells greatly toward the outer circumferential side.

  On the other hand, in the rotor core 20 of the first embodiment, each of the inner peripheral side rib 80 and the outer peripheral side rib 90 is deformed so as to bend, so that a relatively large centrifugal force acting on the outer peripheral side rotor core 26 is applied to the outer peripheral side rib. 90, the connection rib 72, and the inner peripheral side rib 80 are suppressed from being transmitted to the inner peripheral side rotor core 25, and the swelling of the inner peripheral side rotor core 25 is suppressed.

  Further, the narrow angle α formed by the first outer peripheral rib 92 and the second outer peripheral rib 94 toward the outer peripheral side, and the first inner peripheral rib 82 and the second inner peripheral rib 84 toward the inner peripheral side. By appropriately setting the narrow angle β formed by each, the strength and ease of deformation of the outer peripheral rib 90 and the inner peripheral rib 80 can be adjusted to desired characteristics, respectively. The deformation of the outer circumferential rotor core 26 can be suppressed, and the centrifugal stress generated in the outer circumferential rotor core 26 can be suppressed.

  Further, when the rotary shaft is press-fitted into the shaft hole 22 of the rotor core 20, the inner peripheral rotor core 25 is displaced from the central portion toward the outer peripheral side (a press-fitting displacement occurs). However, since the inner peripheral rib 80 and the outer peripheral rib 90 are deformed so as to bend and the press-fitting displacement is absorbed in the outer peripheral rib 80 outer peripheral-side rib 90, the press-fitting displacement generated in the outer peripheral rotor core 26 is reduced. This can be reduced, and the press-fitting stress generated in the outer rotor core 26 is suppressed.

  Further, since the connecting rib 72 is formed so as to be closer to the radial intermediate portion M of the through hole 24 than the outer peripheral rotor core 26 and the inner peripheral rotor core 25 in the radial direction, the inner peripheral rib 80 and the outer peripheral rib 80 are formed. It becomes easy to ensure the length of the side rib 90 in the radial direction. Therefore, when the rotary shaft is press-fitted into the shaft hole 22 of the rotor core 20, the deformation of the inner peripheral rib 80 and the outer peripheral rib 90 when the inner peripheral rotor core 25 is displaced from the central portion toward the outer peripheral side is connected. The obstruction by the ribs 72 can be suppressed, and the swelling of the inner peripheral rotor core 25 and the outer peripheral rotor core 26 to the outer peripheral side can be further suppressed.

Further, the outer peripheral side end portion of the first outer peripheral rib 92 constituting the outer peripheral side rib 90 is the second outer peripheral side constituting the other outer peripheral side rib 90 adjacent in the circumferential direction at the connection position with the outer peripheral side rotor core 26. The inner peripheral side end portion of the first inner peripheral side rib 82 that is connected to the outer peripheral side end portion of the rib 94 and constitutes the inner peripheral side rib 80 is adjacent in the circumferential direction at the connection position with the inner peripheral side rotor core 25. It is connected to the inner peripheral end of the second inner peripheral rib 84 that constitutes the other inner peripheral rib 80. Therefore, the first outer peripheral rib 92 and the second outer peripheral rib 94 can be formed with a longer circumferential length than the case where the outer peripheral end portions are not connected to each other, and the first inner peripheral rib 82 and the second inner peripheral rib 82 can be formed. The side rib 84 can be formed to have a longer circumferential length than when the inner peripheral side ends are not connected to each other. Therefore, when the rotary shaft is press-fitted into the shaft hole 22 of the rotor core 20, the outer rib 90 and the inner peripheral side are provided. Since the deformation of the side rib 80 can be further facilitated, the press-fitting stress generated in the outer circumferential rotor core 26 can be more effectively reduced.
Further, when a centrifugal force is applied to the rotor core 20 during the rotation of the rotor, the deformation of the inner peripheral rib 80 and the outer peripheral rib 90 is further facilitated against the force that pulls the rotor core 20 toward the outer diameter side. Therefore, a relatively large centrifugal force acting on the outer peripheral side rotor core 26 becomes difficult to be transmitted to the inner peripheral side rotor core 25 via the outer peripheral side rib 90, the connecting rib 72, and the inner peripheral side rib 80, and the inner peripheral side The swelling of the side rotor core 25 is further suppressed.

  As described above, in the rotor core 20 of the first embodiment, both the press-fit stress and the centrifugal stress can be reduced, and the swelling of the inner rotor core 25 and the outer rotor core 26 toward the outer periphery can be suppressed in a well-balanced manner. Became clear.

(Second Embodiment)
Next, the rotor of the rotating electrical machine according to the second embodiment will be described. The rotor 10A of the rotating electrical machine according to the present embodiment has the same basic configuration as that of the first embodiment, and the configuration of the rib 70 that connects the inner rotor core 25 and the outer rotor core 26 is different. Are omitted or simplified by giving the same reference numerals.

  As shown in FIGS. 7 and 8, in the rotor 10 </ b> A of the rotating electrical machine according to the present embodiment, the inner peripheral rib 80 is formed to have the same shape as the first embodiment. On the other hand, the outer peripheral rib 90 is formed in such a manner that the narrow angle α formed by the first outer peripheral rib 92 and the second outer peripheral rib 94 toward the outer peripheral side is smaller than that in the first embodiment. The circumferential rib 82 and the second inner circumferential rib 84 are set to be smaller than a narrow angle formed toward the inner circumferential side (α <β). In this case, the outer peripheral rib 90 has higher rigidity against the tensile force toward the outer peripheral side than the inner peripheral rib 80.

  Here, FIG. 9 shows the amount of swelling of the inner peripheral surface (shaft hole 22) of the inner peripheral rotor core 25 and the outer peripheral surface (outer peripheral surface 20a) of the outer peripheral rotor core 26 toward the outer peripheral side. In the figure, the amount of swelling in the first embodiment and Comparative Example 3 described later is also shown for comparison. In FIG. 9, the bulge amount of the inner peripheral surface of the inner peripheral side rotor core 25 and the bulge amount of the outer peripheral surface of the outer peripheral side rotor core 26 are represented by two vertical axes having different scales. It should be noted that the vertical scale in FIG. 9 is different from the vertical scale in FIG.

  It can be seen that the swelling of the outer circumferential surface of the outer circumferential rotor core 26 toward the outer circumferential side is the second embodiment <the first embodiment. In the second embodiment, the rigidity of the outer peripheral side rib 90 connected to the outer peripheral side rotor core 26 is set to be higher than that of the inner peripheral side rib 80, so that the swelling of the outer peripheral side rotor core 26 is suppressed. This is because.

  Further, the swelling of the inner circumferential rotor core 25 toward the outer circumferential side is the first embodiment <the second embodiment. This is because in the second embodiment, compared to the first embodiment, the inner peripheral rib 80 and the outer peripheral rib 90 are less likely to be deformed due to the force pulling the outer rotor core 26 toward the outer periphery. This is because the centrifugal force acting on the outer circumferential rotor core 26 during rotation is transmitted to the inner circumferential rotor core 25, and the inner circumferential rotor core 25 is easily bulged toward the outer circumferential side. However, also in the second embodiment, as in the first embodiment, the bulges of the inner circumferential rotor core 25 and the outer circumferential rotor core 26 toward the outer circumferential side are suppressed in a well-balanced manner, and a remarkable effect is achieved.

(Comparative Example 3)
Next, the rotor of the rotating electrical machine according to Comparative Example 3 will be described. The rotor 510 of the rotating electrical machine according to this comparative example has the same basic configuration as the above-described embodiment, and the configuration of the ribs that connect the inner rotor core 25 and the outer rotor core 26 is different. The description is omitted or simplified by giving the same reference numerals.

  As shown in FIGS. 10 and 11, the rib 570 of the present modification is configured with an inner peripheral rib 580 and an outer peripheral rib 590 without the connection rib 72 as in the above-described embodiment. .

  The inner circumferential rib 580 is substantially linear in shape extending from the inner circumferential rotor core 25 toward the outer circumferential rotor core 26 to one side in the circumferential direction (right side in FIG. 11) and the other side in the circumferential direction (left side in FIG. 11). Of the first inner peripheral rib 582 and the second inner peripheral rib 584, and the outer peripheral end of the first inner peripheral rib 582 and the outer peripheral end of the second inner peripheral rib 584 are connected to each other. A peripheral side connecting portion 586.

  The outer peripheral ribs 590 are substantially straight first outer peripheral ribs 592 and second outer peripheral ribs 594 that extend from the outer peripheral rotor core 26 toward the inner peripheral rotor core 25, respectively, extending to one circumferential side and the other circumferential side. And an outer peripheral side connection portion 396 in which an inner peripheral side end portion of the first outer peripheral side rib 592 and an inner peripheral side end portion of the second outer peripheral side rib 594 are connected to each other.

  The inner peripheral side connecting portion 586 and the outer peripheral side connecting portion 596 are directly connected to each other. Further, the first inner peripheral rib 582 and the second outer peripheral rib 594 are formed on the same straight line, and the second inner peripheral rib 584 and the first outer peripheral rib 592 are formed on the same straight line. . Therefore, the narrow angle α formed by the first inner peripheral rib 582 and the second inner peripheral rib 584 and the narrow angle β formed by the first outer peripheral rib 592 and the second outer peripheral rib 594 are substantially the same. (Α = β), and the rib 570 is formed in a substantially X shape.

  Here, referring to FIG. 9, in Comparative Example 3, the bulges of the inner peripheral side rotor core 25 and the outer peripheral side rotor core 26 toward the outer peripheral side are larger than those in the first and second embodiments. . Therefore, in order to simultaneously suppress the swelling of the inner and outer rotor cores, the connecting rib 72 is provided on the rib 70 as in the first and second embodiments described above, and the narrow angle α and the narrow angle β are provided. It is clear that the outer peripheral side rib 90 and the inner peripheral side rib 80 need to be configured so as to be deformable while maintaining appropriate strength by setting to different values (α ≠ β). It became.

  The rotor 10 of the rotating electrical machine of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.

10, 10A Rotor 20 of rotating electrical machine Rotor core 20a Outer peripheral surface 21 Silicon steel plate 22 Shaft hole 23 Circumferential rib 24 Through hole 24a Outer peripheral surface 24b Inner peripheral surface 25 Inner peripheral rotor core 26 Outer peripheral rotor core 30 Permanent magnets 32a, 32b, 32c Permanent Magnet piece 32d Circumferential outer end face 40 Magnet insertion holes 42a, 42b, 42c Hole 50 Magnetic pole part 60 Side barrier part 70 Rib 72 Connecting rib (connecting part)
80 Inner peripheral rib 82 First inner peripheral rib 84 Second inner peripheral rib 86 Inner peripheral connecting portion 90 Outer peripheral rib 92 First outer peripheral rib 94 Second outer peripheral rib 96 Outer peripheral connecting portion α, β Narrow Angle M Radial direction intermediate part M1 Outer peripheral side intermediate part M2 Inner peripheral side intermediate part O Center

Claims (5)

A substantially annular rotor core having a plurality of magnet insertion holes formed at predetermined intervals in the circumferential direction;
A permanent magnet inserted into the magnet insertion hole;
A rotating shaft that is press-fitted into a shaft hole formed in a central portion of the rotor core;
A rotor of a rotating electric machine with
The rotor core includes a substantially annular through hole penetrating in the axial direction on the inner peripheral side of the magnet insertion hole, an inner peripheral rotor core on the inner peripheral side of the through hole, and an outer peripheral rotor core on the outer peripheral side of the through hole. And having
The inner circumferential rotor core and the outer circumferential rotor core are connected by a plurality of ribs arranged at predetermined intervals in the circumferential direction,
The rib is
A first inner circumferential rib and a second inner circumferential rib extending in the circumferential one side and the other circumferential side in the direction from the inner circumferential rotor core to the outer circumferential rotor core, and the outer circumference of the first inner circumferential rib An inner peripheral side rib having an inner peripheral side connection portion in which a side end portion and an outer peripheral side end portion of the second inner peripheral side rib are connected to each other;
A first outer peripheral side rib and a second outer peripheral side rib extending in the circumferential one side and the other circumferential side in the direction from the outer peripheral side rotor core toward the inner peripheral side rotor core, and an inner peripheral side end of the first outer peripheral side rib An outer peripheral side rib having an outer peripheral side connecting portion in which a portion and an inner peripheral side end of the second outer peripheral side rib are connected to each other;
A connecting portion for connecting the inner peripheral side connecting portion and the outer peripheral side connecting portion;
With
A narrow angle formed by the first outer peripheral rib and the second outer peripheral rib toward the outer peripheral side, and a narrow angle formed by the first inner peripheral rib and the second inner peripheral rib toward the inner peripheral side. A rotor of a rotating electrical machine characterized by having a size different from a corner. 2. The rotating electrical machine according to claim 1, wherein the connecting portion includes a connecting rib that extends and connects the inner peripheral side connecting portion and the outer peripheral side connecting portion in a radial direction. Rotor. The narrow angle formed by the first outer peripheral rib and the second outer peripheral rib toward the outer peripheral side is the narrow angle formed by the first inner peripheral rib and the second inner peripheral rib toward the inner peripheral side. The rotor for a rotating electrical machine according to claim 1, wherein the rotor is larger than a corner. The said connection part is formed so that it may become near the radial direction intermediate part of the said through-hole in the radial direction rather than the said outer peripheral side rotor core and the said inner peripheral side rotor core. A rotor for a rotating electrical machine according to claim 1. The outer peripheral side end portion of the first outer peripheral side rib constituting the outer peripheral side rib is the second outer peripheral side rib constituting the other outer peripheral side rib adjacent in the circumferential direction at the connection position with the outer peripheral side rotor core. Connected to the outer peripheral side end of the
The inner peripheral side end of the first inner peripheral side rib constituting the inner peripheral side rib constitutes the other inner peripheral side rib adjacent in the circumferential direction at the connection position with the inner peripheral side rotor core. The rotor of the rotating electrical machine according to any one of claims 1 to 4, wherein the rotor is connected to an inner peripheral side end portion of the second inner peripheral side rib.