Rotor of an electric rotating machine

Abstract

A rotor of a rotary electric machine capable of suppressing breakage of an end plate is provided. A rotor (100) of a rotary electric machine includes: a rotor shaft member (10); a rotor core (20) disposed at an outer side in a radial direction than the rotor shaft member (10); a first end plate (30) and a second end plate (31) disposed at both ends of the rotor core (20) in an axial direction; a ring (40) and a flange (50) sandwiching the rotor core (20), the first end plate (30), and the second end plate (31) from both sides in the axial direction, the first end plate (30) being disposed between the rotor core (20) and the ring (40) in the axial direction, the second end plate (31) being disposed between the rotor core (20) and the flange (50) in the axial direction, the ring (40) having an inner peripheral portion (41) and an outer peripheral portion (42) disposed at an outer side in the radial direction than the inner peripheral portion (41), the outer peripheral portion (42) having a rigidity lower than a rigidity of the inner peripheral portion (41), and the outer peripheral portion (42) being in contact with the first end plate (30).

Description

Technical Field

[0001] This disclosure relates to a rotor of a rotating electric machine. Background Technology

[0002] Patent Document 1 discloses a rotor. The rotor includes a shaft, a laminated core, a permanent magnet, an end plate, and a fixing member. The laminated core has a structure in which multiple electromagnetic steel plates are stacked along the axial direction. The laminated core is fixed to the outer periphery of the shaft. The permanent magnet is disposed in the laminated core. The end plate restricts the axial movement of the permanent magnet. The fixing member fixes the end plate. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2005-318785 Summary of the Invention

[0004] In the aforementioned rotor, due to factors such as warping of the individual electromagnetic steel plates, the axial thickness of the laminated core increases radially outward. This causes warping at the end plates. If warping occurs at the end plates, the surface pressure applied to the end plates at the contact points with the fixing members increases. Therefore, there is a problem that the end plates are prone to breakage.

[0005] This disclosure was made to solve the above-mentioned technical problems, and its purpose is to provide a rotor of a rotary electric motor that can suppress end plate breakage.

[0006] The rotor of the rotary electric machine disclosed herein includes: a shaft member; a rotor core disposed radially outside the shaft member; a first end plate and a second end plate disposed axially at both ends of the rotor core; and a first fixing member and a second fixing member clamping the rotor core, the first end plate, and the second end plate from both sides of the axial direction. The first end plate is disposed between the rotor core and the first fixing member in the axial direction, and the second end plate is disposed between the rotor core and the second fixing member in the axial direction. At least one of the first fixing member and the second fixing member has an inner periphery and an outer periphery disposed radially outside the inner periphery. The outer periphery is elastically deformable along the axial direction by making its rigidity lower than that of the inner periphery. The outer periphery contacts the first end plate or the second end plate.

[0007] According to this disclosure, it is possible to suppress end plate breakage. Attached Figure Description

[0008] Figure 1This is a cross-sectional view of the rotor of the rotary electric motor according to Embodiment 1. Figure 2 This is a cross-sectional view of the rotor of the rotary electric motor according to Embodiment 2. Figure 3 This is a cross-sectional view of the rotor of the rotary electric motor according to Embodiment 3. Figure 4 This is a front view of the ring included in the rotor of the rotary electric motor according to embodiment 4. Figure 5 It means Figure 4 A cross-sectional view of section VV. Figure 6 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to Embodiment 4. Figure 7 It means Figure 6 Sectional view of section VI I-VI I. Figure 8 This is a front view of the ring included in the rotor of the rotary electric machine according to Embodiment 5. Figure 9 It means Figure 8 A sectional view of section IX-IX. Figure 10 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to Embodiment 5. Figure 11 It means Figure 10 A sectional view of section XI-XI. Figure 12 This is a front view of the ring included in the rotor of the rotary electric motor according to embodiment 6. Figure 13 It means Figure 12 A sectional view of section XIII-XIII. Figure 14 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to Embodiment 6. Figure 15 It means Figure 14 A sectional view of the XV-XV section. (Symbol Explanation) 10. Rotating shaft component; 11. Shaft; 20. Rotor core; 20a. Through hole; 21. Magnet insertion hole; 22. Permanent magnet; 23. Electromagnetic steel plate; 30. First end plate; 30a. Through hole; 31. Second end plate; 31a. Through hole; 40. Ring; 41. Inner circumference; 41a. Surface; 42. Outer circumference; 42a. Surface; 42b. First outer circumference; 42c. Second outer circumference; 42d. Surface; 42e. Outer circumference; 43. Opening; 44. Slot; 45. Notch; 46. Residual part; 50. Flange; 51. Inner circumference; 51a. Surface; 52. Outer circumference; 52a. Surface; 100. Rotor; D1, D2, D3, D4 outer diameters; T1, T2, T3, T4 thicknesses. Detailed Implementation

[0009] Implementation Method 1 The rotor of the rotary electric machine of Embodiment 1 will be described. Figure 1 This is a cross-sectional view of the rotor of the rotary electric machine according to this embodiment. In the following description, the direction along the axis 11 of the shaft member 10 is sometimes referred to as the axial direction of the shaft member 10, or simply the axial direction. The direction along the circumference of the shaft member 10 in a section perpendicular to the axial direction is sometimes referred to as the circumferential direction of the shaft member 10, or simply the circumferential direction. The direction along the radius of the shaft member 10 in a section perpendicular to the axial direction is sometimes referred to as the radial direction of the shaft member 10, or simply the radial direction. Figure 1 The image shows a cross-section of the rotor 100 cut off along the axial and radial directions. Figure 1 The left and right directions indicate the axial direction.

[0010] like Figure 1 As shown, the rotor 100 has a shaft component 10, a rotor core 20, a first end plate 30, a second end plate 31, a ring 40, and a flange 50. The rotor 100 is used in rotating motors such as electric motors and generators.

[0011] The rotating shaft member 10 is configured to transmit rotational power between the rotary motor and the outside of the rotary motor. The rotating shaft member 10 has a cylindrical shape centered on the shaft 11.

[0012] The rotor 20 is located radially outward from the shaft member 10. The rotor core 20 has a cylindrical shape. The rotor core 20 has a structure in which multiple electromagnetic steel plates 23 are stacked along the axial direction. A circular through hole 20a is formed in the center of the rotor core 20. The shaft member 10 is inserted into the through hole 20a. The rotor core 20 is fixed to the shaft member 10.

[0013] A magnet insertion hole 21 is formed in the rotor core 20. The magnet insertion hole 21 extends through the rotor core 20 along the axial direction. A permanent magnet 22 is inserted into the magnet insertion hole 21. The permanent magnet 22 is fixed in the magnet insertion hole 21 using resin or the like.

[0014] A first end plate 30 is axially disposed at one end of the rotor core 20. The first end plate 30 is adjacent to one axial end face of the rotor core 20. A second end plate 31 is axially disposed at the other end of the rotor core 20. The second end plate 31 is adjacent to the other axial end face of the rotor core 20. Both the first end plate 30 and the second end plate 31 are located radially outward from the shaft member 10. The first end plate 30 and the second end plate 31 are each circular plate-shaped. The first end plate 30 and the second end plate 31 are formed of non-magnetic materials such as aluminum and stainless steel. In this embodiment, the outer diameter D1 of the first end plate 30, the outer diameter D2 of the second end plate 31, and the outer diameter of the rotor core 20 are the same.

[0015] The first end plate 30 and the second end plate 31 have the function of preventing the permanent magnet 22 from protruding from the magnet insertion hole 21. The first end plate 30 and the second end plate 31 are respectively configured to overlap with the magnet insertion hole 21 when viewed along the axial direction.

[0016] A circular through hole 30a is formed at the center of the first end plate 30. A circular through hole 31a is formed at the center of the second end plate 31. A rotating shaft member 10 is inserted into the through holes 30a and 31a.

[0017] The flange 50 is positioned axially outside the second end plate 31. That is, the second end plate 31 is axially positioned between the rotor core 20 and the flange 50. The flange 50 is integrally formed with the shaft member 10 from the same material. The flange 50 is located on a portion of the shaft member 10 in the axial direction. The flange 50 protrudes radially outward from the outer circumferential surface of the shaft member 10 in a flange-like manner. The outer diameter D4 of the flange 50 is smaller than the outer diameter D2 of the second end plate 31. The axial thickness of the flange 50 is constant both circumferentially and radially.

[0018] The ring 40 is axially positioned on the outer side of the first end plate 30. That is, the first end plate 30 is axially positioned between the rotor core 20 and the ring 40. The ring 40 and the shaft member 10 are formed separately. The shaft member 10 is inserted into the inner circumference of the ring 40. The ring 40 is fixed to the shaft member 10, for example, by press-fitting. The outer diameter D3 of the ring 40 is smaller than the outer diameter D1 of the first end plate 30. Ideally, the material of the ring 40 has the same coefficient of linear expansion as the material of the shaft member 10.

[0019] The ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The inner peripheral portion 41 is radially adjacent to the rotating shaft member 10. The outer peripheral portion 42 is located radially outward from the inner peripheral portion 41. The axial thickness T2 of the outer peripheral portion 42 is smaller than the axial thickness T1 of the inner peripheral portion 41. Thus, the ring 40 is formed in an L-shape in the axial section. The thicknesses of the inner peripheral portion 41 and the outer peripheral portion 42 are uniform throughout the circumferential direction. Since the thickness T2 of the outer peripheral portion 42 is smaller than the thickness T1 of the inner peripheral portion 41, the rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41. In this specification, "rigidity" refers to so-called bending rigidity. Bending rigidity is an indicator of the difficulty of bending deformation of a component.

[0020] The inner peripheral portion 41 has a surface 41a opposite to the first end plate 30. The outer peripheral portion 42 has a surface 42a opposite to the first end plate 30. Surfaces 41a and 42a are substantially the same surface. Surfaces 41a and 42a are smooth surfaces, that is, planes without any rough or uneven surfaces. Surfaces 41a and 42a are in contact with the first end plate 30.

[0021] The ring 40 can also be fixed to the rotating shaft member 10 by hot pressing. In this case, the rotating shaft member 10 is inserted into the heated ring 40.

[0022] Furthermore, the ring 40 can also be screwed onto the rotating shaft member 10. In this case, a female thread is formed on the inner circumferential surface of the ring 40. A nut can be used as the ring 40. A male thread is formed on the outer circumferential surface of the rotating shaft member 10. By rotating the ring 40 relative to the rotating shaft member 10, the male thread formed on the rotating shaft member 10 is inserted into the female thread formed on the ring 40. Thus, the ring 40 is mounted on the rotating shaft member 10. An anti-rotation part can also be formed by deforming a portion of the female thread of the ring 40 or a portion of the male thread of the rotating shaft member 10. Thus, the position of the ring 40 relative to the rotating shaft member 10 can be fixed.

[0023] The rotor core 20, the first end plate 30, and the second end plate 31 are held axially from both sides by a ring 40 and a flange 50. The ring 40 and the flange 50 function as a pair of fixing members that hold the rotor core 20, the first end plate 30, and the second end plate 31 axially from both sides. That is, the ring 40 functions as one fixing member, and the flange 50 functions as another fixing member.

[0024] A gap is formed between two adjacent electromagnetic steel plates 23 of the rotor core 20. During the manufacturing process of the rotor 100, the shaft member 10 is inserted, for example, into the through hole 20a of the rotor core 20 by pressing. At this time, due to the inserted shaft member 10, the spacing between the electromagnetic steel plates 23 on the inner circumference side of the rotor core 20 narrows. As a result, the axial thickness at the outer circumference of the rotor core 20 is relatively larger than the axial thickness at the inner circumference. That is, the axial thickness at the outer circumference of the rotor core 20 is larger than the axial thickness at the inner circumference. The difference in axial thickness between the outer and inner circumference of the rotor core 20 is actually very small, but... Figure 1 It is drawn for emphasis.

[0025] Due to the difference in axial thickness at the outer and inner circumferences of the rotor core 20, warping occurs in both the first end plate 30 and the second end plate 31. Specifically, the first end plate 30 warps radially outward from the second end plate 31, and the second end plate 31 warps radially outward from the first end plate 30. The degree of warping in both the first and second end plates 30 is actually very small, but... Figure 1 It is drawn for emphasis.

[0026] At least the outer peripheral portion 42 of the ring 40 has a surface 42a in contact with the first end plate 30. This contact between the outer peripheral portion 42 and the first end plate 30 causes elastic deformation in the outer peripheral portion 42, particularly in the axial direction. The outer peripheral portion 42 flexes in a manner that follows the warping of the first end plate 30.

[0027] As described above, the rotor 100 of the rotary electric machine of this embodiment includes a shaft member 10, a rotor core 20, a first end plate 30 and a second end plate 31, a ring 40, and a flange 50. The rotor core 20 is arranged radially outward from the shaft member 10. The first end plate 30 and the second end plate 31 are arranged axially at both ends of the rotor core 20. The ring 40 and the flange 50 clamp the rotor core 20, the first end plate 30, and the second end plate 31 from both axial sides. The ring 40 is an example of a first fixing member. The flange 50 is an example of a second fixing member.

[0028] The rotor core 20 has a structure formed by stacking multiple electromagnetic steel plates 23 along the axial direction. A first end plate 30 is positioned axially between the rotor core 20 and the ring 40. A second end plate 31 is positioned axially between the rotor core 20 and the flange 50. The ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The outer peripheral portion 42 is located radially outward from the inner peripheral portion 41. The rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41. Therefore, the outer peripheral portion 42 can elastically deform along the axial direction. The outer peripheral portion 42 is in contact with the first end plate 30.

[0029] According to the above structure, since the rigidity of the outer peripheral portion 42 of the ring 40 is lower than that of the inner peripheral portion 41 of the ring 40, when the first end plate 30 warps, the outer peripheral portion 42 elastically deforms in accordance with the warping of the first end plate 30. In particular, since the surfaces 41a and 42a of the ring 40 opposite to the first end plate 30 are smooth surfaces, the ring 40 and the first end plate 30 slide radially relative to each other in the contact surface formed by the surfaces 41a and 42a, resulting in positional displacement, while the less rigid portion of the outer peripheral portion 42 of the ring 40 elastically deforms axially. As a result, the surface pressure applied to the first end plate 30 at the contact portion between the first end plate 30 and the outer peripheral portion 42 is suppressed, and therefore, the stress generated in the first end plate 30 is dispersed. Therefore, according to the above structure, damage to the first end plate 30 can be suppressed.

[0030] In the rotor 100 of the rotary electric machine of this embodiment, a magnet insertion hole 21 is formed in the rotor core 20. A permanent magnet 22 is inserted into the magnet insertion hole 21. The first end plate 30 and the second end plate 31 are respectively arranged to overlap with the magnet insertion hole 21 when viewed along the axial direction. The first end plate 30 and the second end plate 31 are each formed of a non-magnetic material.

[0031] According to the above structure, the permanent magnet 22 can be prevented from being ejected from the magnet insertion hole 21. Furthermore, since the first end plate 30 and the second end plate 31 are both made of non-magnetic materials, the efficiency reduction of the rotary motor due to magnetic flux loss, etc., can be prevented. In this embodiment, the stress generated in the first end plate 30 is dispersed; therefore, even if the first end plate 30 is made of a non-magnetic material, damage to the first end plate 30 can be suppressed.

[0032] Here, the tightness between the first end plate 30 and the second end plate 31 and the shaft member 10 needs to be ensured even when the rotating motor reaches high temperatures during operation. Therefore, if the materials of the first end plate 30 and the second end plate 31 have different coefficients of linear expansion than the material of the shaft member 10, the tightness between the first end plate 30 and the second end plate 31 and the shaft member 10 increases at low temperatures, and the stress on the first end plate 30 and the second end plate 31 may sometimes increase. In this embodiment, a ring 40 having the same coefficient of linear expansion as the shaft member 10 is pressed into the shaft member 10 in one direction. Alternatively, the male thread of the shaft member 10 is fastened to the female thread of the ring 40. Thus, the first end plate 30 and the second end plate 31 can be held in place by the shaft member 10 even if the tightness is not necessarily sufficiently ensured. As a result, even if the first end plate 30 and the second end plate 31 are made of non-magnetic materials, the increase in stress generated in the first end plate 30 and the second end plate 31 can be prevented. Therefore, it can suppress the damage to the first end plate 30 and the second end plate 31.

[0033] In the rotor 100 of the rotary electric machine of this embodiment, the flange 50 and the shaft member 10 are integrally formed. The ring 40 and the shaft member 10 are separately formed.

[0034] According to the above structure, the number of parts can be reduced. Furthermore, according to the above structure, since the flange 50 is formed simultaneously when molding the shaft member 10, the step of installing the flange 50 onto the shaft member 10 is unnecessary. When installing the rotor core 20, the first end plate 30, the second end plate 31, and the ring 40 onto the shaft member 10, only the step of installing the ring 40 after installing the rotor core 20, the first end plate 30, and the second end plate 31 axially from one end onto the shaft member 10 is required. Therefore, the rotor 100 can be manufactured at a low cost.

[0035] In the rotor 100 of the rotary electric machine of this embodiment, the axial thickness T2 of the outer peripheral portion 42 is smaller than the axial thickness T1 of the inner peripheral portion 41. It is relatively easy to make the thickness of the ring 40 locally different during molding. Therefore, according to the above structure, it is easy to obtain a structure in which the rigidity of the outer peripheral portion 42 is lower than the rigidity of the inner peripheral portion 41.

[0036] In this embodiment, the thickness T1 of the inner peripheral portion 41 and the thickness T2 of the outer peripheral portion 42 are uniform throughout the circumferential direction. Therefore, since the rigidity of the ring 40 is uniform throughout the circumferential direction, localized stress concentration in the circumferential direction can be prevented. Furthermore, since the thickness T1 of the inner peripheral portion 41 and the thickness T2 of the outer peripheral portion 42 are uniform throughout the circumferential direction, the influence on the rotational balance of the rotor 100 can be suppressed.

[0037] Furthermore, in this embodiment, the ring 40 is formed in an L-shape in the cross-section along the axial direction. Therefore, there is no need to provide complex protrusions and recesses in the ring 40, allowing for a relatively simple three-dimensional structure. Consequently, the occurrence of molding defects can be suppressed, and the ring 40 can be easily molded.

[0038] Implementation Method 2 The rotor of the rotary electric motor in Embodiment 2 will be described. Figure 2 This is a cross-sectional view of the rotor of the rotary electric machine according to this embodiment. The rotor 100 of this embodiment differs from that of Embodiment 1 in the structure of the ring 40 and the flange 50. The other structures are the same as those of Embodiment 1.

[0039] like Figure 2 As shown, the flange 50 has an inner peripheral portion 51 and an outer peripheral portion 52. The outer peripheral portion 52 is located radially outward from the inner peripheral portion 51. The flange 50 is integrally formed with the shaft member 10. The axial thickness T4 of the outer peripheral portion 52 is smaller than the axial thickness T3 of the inner peripheral portion 51. As a result, the flange 50 is formed in an L-shape in the axial section. Since the thickness T4 of the outer peripheral portion 52 is smaller than the thickness T3 of the inner peripheral portion 51, the rigidity of the outer peripheral portion 52 is lower than that of the inner peripheral portion 51.

[0040] The inner peripheral portion 51 has a surface 51a opposite to the second end plate 31. The outer peripheral portion 52 has a surface 52a opposite to the second end plate 31. Surfaces 51a and 52a substantially form the same surface. At least the surface 52a of the outer peripheral portion 52 of the flange 50 contacts the second end plate 31. Through the contact between the outer peripheral portion 52 and the second end plate 31, elastic deformation is generated in the outer peripheral portion 52, particularly in the axial direction. The outer peripheral portion 52 flexes in a manner that follows the warping of the second end plate 31.

[0041] The axial thickness of ring 40 is constant in the radial direction. In this embodiment, ring 40 is formed as a rectangle in the cross-section along the axial direction. As a result, the rigidity of ring 40 is the same in both the inner and outer circumferences.

[0042] As explained above, in the rotor 100 of the rotary electric machine of this embodiment, the flange 50 has an inner peripheral portion 51 and an outer peripheral portion 52. The outer peripheral portion 52 is located radially outward from the inner peripheral portion 51. The rigidity of the outer peripheral portion 52 is lower than that of the inner peripheral portion 51. The outer peripheral portion 52 contacts the second end plate 31.

[0043] According to the above structure, since the rigidity of the outer peripheral portion 52 of the flange 50 is lower than that of the inner peripheral portion 51 of the ring 50, when the second end plate 31 warps, the outer peripheral portion 52 elastically deforms in accordance with the warping of the second end plate 31. As a result, the surface pressure applied to the second end plate 31 at the contact portion between the second end plate 31 and the outer peripheral portion 52 is suppressed, and thus the stress generated in the second end plate 31 is dispersed. Therefore, according to the above structure, damage to the second end plate 31 can be suppressed.

[0044] In the rotor 100 of the rotary electric machine of this embodiment, the axial thickness T4 of the outer peripheral portion 52 is smaller than the axial thickness T3 of the inner peripheral portion 51. When molding the shaft member 10 and the flange 50, it is relatively easy to make the thickness of the flange 50 locally different. Therefore, according to the above structure, it is easy to obtain a structure in which the rigidity of the outer peripheral portion 52 is lower than the rigidity of the inner peripheral portion 51.

[0045] In this embodiment, the thickness T3 of the inner peripheral portion 51 and the thickness T4 of the outer peripheral portion 52 are uniform throughout the circumferential direction. Therefore, since the rigidity of the flange 50 is uniform throughout the circumferential direction, localized stress concentration in the circumferential direction can be prevented. Furthermore, since the thickness T3 of the inner peripheral portion 51 and the thickness T4 of the outer peripheral portion 52 are uniform throughout the circumferential direction, the influence on the rotational balance of the rotor 100 can be suppressed.

[0046] Furthermore, in this embodiment, the flange 50 is formed in an L-shape in the cross-section along the axial direction. Therefore, it is unnecessary to provide complex protrusions and recesses in the flange 50, allowing for a relatively simple three-dimensional structure. Consequently, the occurrence of molding defects can be suppressed, and the flange 50 can be easily molded.

[0047] Implementation Method 3 The rotor of the rotary electric machine in Embodiment 3 will be described. Figure 3 This is a cross-sectional view of the rotor of the rotary electric machine according to this embodiment. The rotor 100 of this embodiment has a structure that is combined with that of Embodiments 1 and 2.

[0048] like Figure 3 As shown, the ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The axial thickness of the outer peripheral portion 42 is smaller than the axial thickness of the inner peripheral portion 41. Therefore, the rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41. At least the surface 42a of the outer peripheral portion 42 in the ring 40 is in contact with the first end plate 30. The outer peripheral portion 42 elastically deforms in a manner that follows the warping of the first end plate 30.

[0049] The flange 50 has an inner peripheral portion 51 and an outer peripheral portion 52. The axial thickness of the outer peripheral portion 52 is smaller than the axial thickness of the inner peripheral portion 51. Therefore, the rigidity of the outer peripheral portion 52 is lower than that of the inner peripheral portion 51. At least the surface 52a of the outer peripheral portion 52 of the flange 50 is in contact with the second end plate 31. The outer peripheral portion 52 elastically deforms in a manner that follows the warping of the second end plate 31.

[0050] That is, in this embodiment, the rigidity of the outer periphery of the pair of fixed members is lower than that of the inner periphery. Other structures are the same as in Embodiment 1 or Embodiment 2.

[0051] As explained above, in the rotor 100 of the rotary electric machine of this embodiment, the ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The outer peripheral portion 42 is located radially outward of the inner peripheral portion 41. The rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41. The outer peripheral portion 42 contacts the first end plate 30. The flange 50 has an inner peripheral portion 51 and an outer peripheral portion 52. The outer peripheral portion 52 is located radially outward of the inner peripheral portion 51. The rigidity of the outer peripheral portion 52 is lower than that of the inner peripheral portion 51. The outer peripheral portion 52 contacts the second end plate 31.

[0052] According to the above structure, since the rigidity of the outer peripheral portion 42 of the ring 40 is lower than that of the inner peripheral portion 41 of the ring 40, when the first end plate 30 warps, the outer peripheral portion 42 elastically deforms in accordance with the warping of the first end plate 30. As a result, the surface pressure applied to the first end plate 30 at the contact portion between the first end plate 30 and the outer peripheral portion 42 is suppressed, and therefore, the stress generated in the first end plate 30 is dispersed. Therefore, according to the above structure, damage to the first end plate 30 can be suppressed.

[0053] Furthermore, according to the above structure, since the rigidity of the outer peripheral portion 52 of the flange 50 is lower than that of the inner peripheral portion 51 of the flange 50, when the second end plate 31 warps, the outer peripheral portion 52 elastically deforms in accordance with the warping of the second end plate 31. As a result, the surface pressure applied to the second end plate 31 at the contact portion between the second end plate 31 and the outer peripheral portion 52 is suppressed, and thus the stress generated in the second end plate 31 is dispersed. Therefore, according to the above structure, damage to the second end plate 31 can be suppressed.

[0054] Furthermore, in the above embodiments 1 to 3, examples were given of a fixing member with ring 40 as one side and flange 50 as the other side, but the examples are not limited to this. Both the fixing member and the fixing member can be formed separately from the rotating shaft member 10. In the above case, the rigidity of the outer peripheral portion of at least one annulus is lower than the rigidity of the inner peripheral portion. For example, the axial thickness of the outer peripheral portion of at least one annulus is smaller than the axial thickness of the inner peripheral portion. According to the above structure, similarly to embodiments 1 to 3, damage to at least one of the first end plate 30 and the second end plate 31 can be suppressed.

[0055] Furthermore, in embodiments 1 to 3 described above, the axial thickness of at least one of the ring 40 and the flange 50 is different in two stages, but this is not a limitation. For example, the axial thickness of at least one of the ring 40 and the flange 50 may be different in multiple stages, with three or more stages. That is, the axial thickness of at least one of the ring 40 and the flange 50 may be formed in a stepped manner, gradually decreasing from the inner circumferential side to the outer circumferential side in three or more stages. In each of the ring 40 and the flange 50, the surface pressure applied to the end plate increases towards the outer circumferential side. Therefore, the outer circumferential portion 42 of the ring 40 or the outer circumferential portion 52 of the flange 50 may also be formed such that the thickness gradually decreases towards the outer circumferential side. Thus, by employing a structure in at least one of the ring 40 and the flange 50 in which the thickness decreases towards the outer circumferential side, a more superior surface pressure reduction effect can be obtained.

[0056] Implementation Method 4 The rotor of the rotary electric machine in Embodiment 4 will be described. Figure 4 This is a front view of the rings included in the rotor of the rotary electric machine according to this embodiment. Figure 4 The structure of ring 40 is shown when viewed along the axial direction. Figure 5 It means Figure 4 A cross-sectional view of section VV. Figure 5 The left and right directions indicate the axial direction. Figure 5 The rotor core 20, the first end plate 30, and the second end plate 31 are arranged on the right side of the ring 40 shown. The structure other than the ring 40 is the same as that in embodiments 1 to 3.

[0057] Furthermore, the structure of the ring 40 in Embodiment 4 and Embodiments 5 and 6 described later can also be applied to the ring 40 in Embodiments 1 and 3 respectively. The structure of the ring 40 in Embodiments 4 to 6 can also be applied to the flange 50 in Embodiments 2 and 3 respectively. The structure of the ring 40 in Embodiments 4 to 6 can also be applied to both the ring 40 and the flange 50 of Embodiment 3.

[0058] like Figure 4as well as Figure 5 As shown, the ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The axial thickness of the outer peripheral portion 42 is smaller than the axial thickness of the inner peripheral portion 41. The ring 40 is formed in an L-shape in a cross-section along the axial direction. Because the thickness of the outer peripheral portion 42 is smaller than the thickness of the inner peripheral portion 41, the rigidity of the outer peripheral portion 42 is smaller than that of the inner peripheral portion 41.

[0059] A plurality of openings 43 are formed in the outer peripheral portion 42. Each opening 43 extends through the outer peripheral portion 42 along the axial direction. By forming the openings 43, the rigidity of the outer peripheral portion 42 is further reduced.

[0060] When viewed along the axial direction, all openings 43 have the same shape. The openings 43 are arranged at equal intervals along the circumference. Each opening 43 has a shape formed by two arcs centered on the axis 11 and two straight lines along the radial direction. The openings 43 are arranged in a rotationally symmetrical manner about the axis 11. Therefore, the center of gravity of the ring 40 coincides with the axis 11.

[0061] Alternatively, a hollow portion can be formed in the outer periphery 42 to replace the opening 43. The hollow portion refers to a recess that does not penetrate the outer periphery 42 in the axial direction.

[0062] Figure 6 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to this embodiment. Figure 7 It means Figure 6 A sectional view of section VI II I. (See also...) Figure 6 as well as Figure 7 As shown, each opening 43 has a circular shape. The openings 43 are arranged in a rotationally symmetrical manner about the axis 11. Other than this, the structure is similar to... Figure 4 as well as Figure 5 The structures are the same.

[0063] exist Figures 4 to 7 In the structure shown, the axial thickness of the outer peripheral portion 42 can be the same as the axial thickness of the inner peripheral portion 41. Even in the above case, since the opening 43 is formed in the outer peripheral portion 42, the rigidity of the outer peripheral portion 42 is still lower than that of the inner peripheral portion 41. When the thickness of the outer peripheral portion 42 is the same as that of the inner peripheral portion 41, an outer peripheral edge portion with the same thickness as the inner peripheral portion 41 is formed on the outer periphery of the ring 40. Therefore, the structural strength of the ring 40 is improved.

[0064] As explained above, in the rotor 100 of the rotary electric machine of this embodiment, an opening 43 is formed in the outer peripheral portion 42. Forming the opening 43 during the molding of the ring 40 is relatively easy. Therefore, based on the above structure, it is easy to obtain a structure in which the rigidity of the outer peripheral portion 42 is lower than the rigidity of the inner peripheral portion 41.

[0065] In the rotor 100 of the rotary electric machine of this embodiment, the opening 43 is configured to be rotationally symmetrical about the axis 11 of the rotating shaft member 10. According to the above structure, since the center of gravity of the ring 40 can be aligned with the axis, the influence on the rotational balance of the rotor 100 can be suppressed.

[0066] Implementation Method 5 The rotor of the rotary electric machine in Embodiment 5 will be described. Figure 8 This is a front view of the rings included in the rotor of the rotary electric machine of this embodiment. Figure 9 It means Figure 8 A cross-sectional view of section IX-IX. The structure other than ring 40 is the same as in embodiments 1 to 3.

[0067] like Figure 8 as well as Figure 9 As shown, the ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The outer peripheral portion 42 has a first outer peripheral portion 42b and a second outer peripheral portion 42c. The first outer peripheral portion 42b is located radially outward from the inner peripheral portion 41. The second outer peripheral portion 42c is located radially outward from the first outer peripheral portion 42b.

[0068] A groove 44 is formed on surface 42a of the first outer peripheral portion 42b. Surface 42a is the surface that contacts the first end plate 30. The groove 44 is an example of a hollow portion. The groove 44 extends continuously along the circumferential direction. The groove 44 has a rectangular cross-section. The axial thickness of the first outer peripheral portion 42b is the same as the axial thickness of the inner peripheral portion 41. Because the groove 44 is formed in the first outer peripheral portion 42b, the rigidity of the first outer peripheral portion 42b is lower than that of the inner peripheral portion 41.

[0069] The axial thickness of the second outer peripheral portion 42c is smaller than the axial thickness of the inner peripheral portion 41. Therefore, the rigidity of the second outer peripheral portion 42c is lower than that of the inner peripheral portion 41.

[0070] Figure 10 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to this embodiment. Figure 11 It means Figure 10 A sectional view of section X IX I. (See attached image) Figure 10 as well as Figure 11 As shown, a groove 44 is formed on the surface 42d of the outer peripheral portion 42. Surface 42d is the surface opposite to surface 42a. The groove 44 extends continuously in the circumferential direction. The axial thickness of the outer peripheral portion 42 is the same as the axial thickness of the inner peripheral portion 41. Because the groove 44 is formed on the outer peripheral portion 42, the rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41.

[0071] As explained above, in the rotor 100 of the rotary electric machine of this embodiment, a hollow portion is formed in the outer peripheral portion 42. The hollow portion is a groove 44 extending circumferentially along the shaft member 10.

[0072] According to the above structure, the thickness of the outer peripheral portion 42 can be kept constant in the circumferential direction. Therefore, since the rigidity of the outer peripheral portion 42 is uniform in the circumferential direction, stress concentration can be prevented.

[0073] Furthermore, since there is no need to create complex protrusions and recesses on the ring 40, the shape of the ring 40 can be made into a relatively simple three-dimensional structure. Therefore, the occurrence of molding defects can be suppressed, and the ring 40 can be easily molded.

[0074] In addition, since the center of gravity of ring 40 can be aligned with the shaft center 11, the influence on the rotational balance of rotor 100 can be suppressed.

[0075] Implementation Method 6 The rotor of the rotary electric machine in Embodiment 6 will be described. Figure 12 This is a front view of the rings included in the rotor of the rotary electric machine of this embodiment. Figure 13 It means Figure 12 A cross-sectional view of sections XI I I-XI II. The structure other than ring 40 is the same as in embodiments 1 to 3.

[0076] like Figure 12 as well as Figure 13 As shown, the ring 40 has an inner peripheral portion 41 and an outer peripheral portion 42. The axial thickness of the outer peripheral portion 42 is smaller than the axial thickness of the inner peripheral portion 41. The ring 40 is formed in an L-shape in a cross-section along the axial direction. Because the thickness of the outer peripheral portion 42 is smaller than the thickness of the inner peripheral portion 41, the rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41.

[0077] Multiple notches 45 are formed in the outer peripheral portion 42. Each notch 45 is cut in such a way that it extends radially inward from the outer peripheral edge 42e of the ring 40. The notches 45 are arranged at equal intervals along the circumferential direction. By forming the notches 45, the rigidity of the outer peripheral portion 42 is further reduced. The notches 45 are arranged to be rotationally symmetrical about the axis 11. As a result, the center of gravity of the ring 40 is aligned with the axis 11.

[0078] A residual portion 46 is formed between two adjacent notches 45 in the circumferential direction. The circumferential width of the residual portion 46 is larger than the circumferential width of the notches 45.

[0079] Figure 14 This is a front view of a modified example of the rings included in the rotor of the rotary electric machine according to this embodiment. Figure 15 It means Figure 14 A sectional view of the XV-XV section. (e.g.) Figure 14 as well as Figure 15 As shown, the circumferential width of the residual portion 46 is smaller than the circumferential width of the notch 45. Other than this, the structure is similar to... Figure 12 as well as Figure 13 The structures are the same.

[0080] exist Figures 12 to 15 In the structure shown, the axial thickness of the outer peripheral portion 42 can also be the same as the axial thickness of the inner peripheral portion 41. Even in the above case, since a notch 45 is formed in the outer peripheral portion 42, the rigidity of the outer peripheral portion 42 is still lower than that of the inner peripheral portion 41.

[0081] As explained above, in the rotor 100 of the rotary electric machine of this embodiment, a notch 45 is formed in the outer peripheral portion 42. Forming the notch 45 is relatively easy when forming the ring 40. Therefore, according to the above structure, it is easy to obtain a structure in which the rigidity of the outer peripheral portion 42 is lower than that of the inner peripheral portion 41.

[0082] In the rotor 100 of the rotary electric machine of this embodiment, the notch 45 is configured to be rotationally symmetrical about the axis 11 of the rotating shaft member 10. According to the above structure, since the center of gravity of the ring 40 can be aligned with the axis, the influence on the rotational balance of the rotor 100 can be suppressed.

[0083] The above-described implementation methods can be combined with each other.

Claims

1. A rotor for a rotary electric motor, characterized in that, include: Rotating shaft components; A rotor core, the rotor core being disposed radially outside the shaft member; A first end plate and a second end plate are disposed at both ends of the rotor core in the axial direction of the rotating shaft member; as well as A first fixing member and a second fixing member clamp the rotor core, the first end plate, and the second end plate from both sides of the axial direction. The first end plate is disposed axially between the rotor core and the first fixing member. The second end plate is disposed axially between the rotor core and the second fixing member. At least one of the first fixing member and the second fixing member has an inner peripheral portion and an outer peripheral portion disposed radially outside the inner peripheral portion. The rigidity of the outer peripheral portion is lower than that of the inner peripheral portion. The outer peripheral portion contacts the first end plate or the second end plate. The surface of the outer periphery that contacts the first end plate or the second end plate is a smooth surface. One of the first and second fixing members and one of the first and second end plates, which are opposite each other on the surface, can slide relative to each other on the surface in the radial direction and undergo positional displacement. As a result, the outer peripheral portion can elastically deform along the axial direction to warp away from one of the first and second end plates relative to the inner peripheral portion.

2. The rotor of the rotary electric motor as described in claim 1, characterized in that, One of the first end plate and the second end plate that is in contact with the outer peripheral portion warps. The outer periphery elastically deforms in a manner that follows the warping of one of the first end plate and the second end plate.

3. The rotor of the rotary electric motor as described in claim 1 or 2, characterized in that, One of the first fixing member and the second fixing member is integrally formed with the rotating shaft member. The other of the first fixing member and the second fixing member is formed separately from the rotating shaft member.

4. The rotor of the rotary electric motor as described in claim 1 or 2, characterized in that, The axial thickness of the outer peripheral portion is smaller than the axial thickness of the inner peripheral portion. The outer periphery is formed such that its thickness gradually decreases as it moves toward the outer periphery.

5. The rotor of the rotary electric motor as described in claim 1 or 2, characterized in that, An opening or a hollowed-out portion is formed in the outer periphery.

6. The rotor of the rotary electric motor as described in claim 5, characterized in that, The opening or the hollowed-out portion is configured to be rotationally symmetrical about the axis of the rotating shaft component.

7. The rotor of the rotary electric motor as described in claim 5, characterized in that, The hollowed-out portion is a groove extending circumferentially along the shaft member.

8. The rotor of the rotating electric motor as described in claim 1 or 2, characterized in that, A notch is formed in the outer periphery.

9. The rotor of the rotary electric machine as described in claim 8, characterized in that, The notch is configured to be rotationally symmetrical about the axis of the rotating shaft member.

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