Rotor of rotating electric machine and method for manufacturing the rotor of rotating electric machine

Abstract

The rotor (1) of the rotating electric machine of the present invention comprises a rotor core (2) having annular plates (3) of magnetic material stacked in the axial direction; a shaft (4) pressed into the inner peripheral surface of the rotor core (2), the inner peripheral surface having a first press-in portion (12), the first press-in portion (12) being a section in the axial direction pressed into the shaft (4); and a second press-in portion (10), the second press-in portion (10) being a section in the axial direction adjacent to the first press-in portion (12) and being pressed into the shaft (4) with a larger interference than the first press-in portion (12), the shaft (4) being pressed into the inner peripheral surface of the rotor core (2) from the first press-in portion (12) side. Thus, the rotor (1) of the rotating electric machine having a structure in which no gap is generated between the stacked plates (3) can be realized at low cost. In addition, the rotor (1) of the rotating electric machine can be manufactured at low cost through simple processes.

Description

Technical Field

[0001] The present application relates to a rotor of a rotating electric machine and a method for manufacturing the rotor of a rotating electric machine. Background Art

[0002] In a conventional rotor of a rotating electric machine, a rotor core is sandwiched between end plates provided at both axial ends of the rotor core and fixed by rivets (for example, see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-19298 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In the conventional rotor of the rotating electric machine shown in Patent Document 1, since the rotor core is clamped by end plates provided at both ends of the rotor core (core) formed by stacking steel plate materials, and fixed by rivets, there are problems such as a large number of parts and assembly processes, and an increase in the manufacturing cost of the rotor. In addition, when the rotor core is fixed to the shaft only by pressing the shaft without using end plates and rivets, there is a problem that gaps are generated between the stacked plates due to the warping of the plates, which becomes a major cause of vibration and noise.

[0008] The purpose of the rotor of the rotating electric machine of the present application is to solve the above-mentioned problems, to realize the rotor of the rotating electric machine having a structure without generating gaps between the plates stacked in the rotor core at low cost, and to manufacture the rotor of the rotating electric machine at low cost through simple processes.

[0009] Technical means for solving technical problems

[0010] The rotor of the rotating electrical machine involved in the present application comprises:

[0011] A rotor core having annular plates of magnetic material stacked in the axial direction; and

[0012] The shaft is pressed into the inner circumference of the rotor core.

[0013] The inner circumferential surface of the rotor core has a first press-in portion, which is a section in the axial direction of the press-in shaft; and a second press-in portion, which is a section in the axial direction adjacent to the first press-in portion and is pressed into the shaft with a larger interference (shrink range) than the first press-in portion.

[0014] The shaft is press-fitted into the inner peripheral surface of the rotor core from the first press-fit portion side.

[0015] The manufacturing method of the rotor of the rotating electric machine involved in the present application includes:

[0016] A step of forming a first press-fit portion by laminating a first annular plate material of a magnetic material having an inner diameter smaller than an outer diameter of the shaft;

[0017] A step of forming a second press-fit portion by laminating a second plate material having a circular ring shape and having a smaller inner diameter than the first plate material.

[0018] A step of laminating a first press-in portion and a second press-in portion; and

[0019] A step of press-fitting the shaft from the first press-fit portion side toward the first press-fit portion and the second press-fit portion.

[0020] Effects of the Invention

[0021] According to the rotor of the rotating electric machine of the present application, a rotor of the rotating electric machine having a structure in which no gap is generated between stacked plates can be realized at low cost. In addition, the rotor of the rotating electric machine can be manufactured at low cost through simple processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view showing a rotor of the rotating electrical machine device according to the first embodiment.

[0023] Figure 2 It is a cross-sectional view showing the axial press-fitting direction of the rotor core of the rotating electrical machine device according to the first embodiment.

[0024] Figure 3 It is a cross-sectional view showing deformation of plate materials of the first press-fit portion and the second press-fit portion of the rotor core of the rotating electrical machine device according to the first embodiment.

[0025] Figure 4 It is a cross-sectional view showing a rotor of a rotating electrical machine device according to the second embodiment.

[0026] Figure 5 It is a cross-sectional view showing the axial press-fitting direction of the rotor core of the rotating electrical machine device according to the second embodiment.

[0027] Figure 6 It is a cross-sectional view showing deformation of plate materials of a first press-fit portion and a second press-fit portion of a rotor core of a rotating electrical machine device according to the second embodiment.

[0028] Figure 7 It is a cross-sectional view showing deformation of plate materials of a first press-fit portion and a non-press-fit portion of a rotor core of a rotating electrical machine device according to the second embodiment.

[0029] Figure 8 It is a cross-sectional view showing a rotor of a rotating electrical machine device according to a third embodiment.

[0030] Fig. 9 It is a cross-sectional view showing the axial press-fitting direction of the rotor core of the rotating electrical machine device according to the third embodiment.

[0031] Fig.10 It is a cross-sectional view showing a portion of the rotor of the rotating electrical machine device according to the third embodiment, into which a magnet is inserted.

[0032] Fig.11 It is a cross-sectional view showing deformation of plate materials of a first press-fit portion and a second press-fit portion of a rotor core of a rotating electrical machine device according to the third embodiment.

[0033] Fig.12 It is a cross-sectional view showing deformation of plate materials of a first press-fit portion and a non-press-fit portion of a rotor core of a rotating electrical machine device according to the third embodiment. DETAILED DESCRIPTION

[0034] 1. Implementation Method 1

[0035] Hereinafter, a rotor 1 of a rotating electrical machine device according to Embodiment 1 of the present application will be described with reference to the drawings. Figure 1 1 is a cross-sectional view showing the rotor 1 of the rotating electrical machine device according to the first embodiment, and shows a cross section cut along a plane along the axis of the rotor 1 . Figure 2 This is a cross-sectional view showing a direction in which the shaft 4 is press-fitted into the rotor core 2 of the rotating electrical machine device according to the first embodiment. Figure 3 It is a cross-sectional view showing deformation of the plate material 3 of the first press-fit portion 12 and the second press-fit portion 10 of the rotor core 2 of the rotating electrical machine device according to the first embodiment.

[0036] <Pressing the shaft into the rotor core>

[0037] exist Figure 1 In the embodiment, the rotor 1 is supported by a bearing (not shown) in a freely rotatable manner on the inner side of a stator (not shown), thereby constituting an inner rotor type rotating electrical machine. The rotor core 2 is formed by stacking annular plates 3 of electromagnetic steel plates, and is fixed to the rotating shaft 4 of the rotating electrical machine by press fitting. A plurality of permanent magnets are provided on the rotor core 2, constituting a rotor of a permanent magnet embedded so-called IPM (Interior Permanent Magnet: embedded permanent magnet) type.

[0038] The rotor core 2 is formed by stacking a ring-shaped plate 3 of electromagnetic steel plates, but the material of the plate 3 uses magnetic materials such as iron, permalloy, and amorphous magnetic alloy. On the inner circumferential surface of the rotor core 2, a center hole 9 is formed for pressing the shaft 4. In the first press-in portion 12, an axial section where the shaft 4 is first pressed in and pressed in and fixed, the size of the center hole 9 is slightly smaller than the outer diameter of the shaft 4. The shaft 4 is pressed into the first press-in portion 12. In the second press-in portion 10, an axial section adjacent to the first press-in portion, into which the shaft 4 is pressed after the first press-in portion 12, the inner diameter is set to be smaller than the first press-in portion 12, that is, the interference is set to be larger.

[0039] Therefore, in the pressing force of the shaft on the inner surface of the rotor core 2, the pressing force of the adjacent second press-in portion is greater than that of the first press-in portion 12. As a result, a stress is generated in the peripheral edge portion of the plate 3 constituting the second press-in portion 10 to press into the peripheral edge portion of the plate 3 of the first press-in portion 12, thereby obtaining a rotor 1 of a rotating electric machine in which no gap is generated between the stacked plates 3. This will be described in detail below.

[0040] Figure 2 : is a diagram showing the pressing direction of the shaft 4 into the rotor core 2. Here, the direction from the first pressing portion 12 of the rotor core 2 toward the second pressing portion 10 is set as the axial first side X1, and the opposite direction is set as the axial second side X2. The shaft 4 is pressed in the direction of the axial first side X1. The shaft is first pressed into the first pressing portion 12, and then pressed into the second pressing portion while passing through the first pressing portion. Through this pressing direction, a stress can be obtained in which the peripheral portion of the plate 3 that is configured to generate the second pressing portion 10 presses the peripheral portion of the plate 3 that generates the first pressing portion 12, thereby generating a rotor of a rotating electric machine without generating a gap between the stacked plates.

[0041] <Sheet deformation>

[0042] The plate 3 is made of an electromagnetic steel plate with a thickness of 0.5 mm, but the thickness is not limited to this. When the shaft 4 is pressed into the center hole 9 of the plate 3, stress is generated on the plate 3 in the pressing direction, and a displacement is generated on the first axial side X1 relative to the surface perpendicular to the shaft 4. In other words, stress is generated to deform the plate 3 into a coil spring shape, so that the vicinity of the axis of the plate 3 bulges in the pressing direction. Figure 3 At the contact point between the plate 3 and the shaft 4 , the shaft 4 is pressed by a force having a component in the axial second side X2 direction and a component inward in the radial direction due to the restoring force of the plate 3 twisted in the axial first side X1 .

[0043] The force of the shaft 4 for pressing the plate 3 becomes a reaction force to press the plate 3, and the plate 3 is deformed into a coil spring shape. Since the plate 3 may fall down at the portion connected to the shaft 4, stress is generated in the peripheral portion of the plate 3 on the second axial side X2. Since the stress of the second press-in portion 10 is greater than the stress of the first press-in portion 12, the magnetic pole portion 8 of the second press-in portion 10 presses the magnetic pole portion 8 of the first press-in portion 12 in the direction of the second axial side X2 in the peripheral portion of the plate 3 at the second press-in portion. As a result, a rotor 1 of a rotating electric machine having a structure in which no gap is generated between the stacked plates 3 can be obtained.

[0044] The interference of the plate 3 of the second press-fit portion 10 is greater than that of the plate 3 of the first press-fit portion 12. That is, the inner diameter of the plate 3 of the second press-fit portion 10 is smaller than the inner diameter of the plate 3 of the first press-fit portion 12. Therefore, the stress of deformation into the coil spring shape becomes greater, such as Figure 3 As shown, a second displacement amount D2 greater than the first displacement amount D1 of the first press-fit portion 12 is generated.

[0045] The radial inner end of the plate 3 of the first press-in portion 12 is displaced toward the axial first side X1 by a first displacement amount D1 relative to the radial outer end, and the radial inner end of the plate 3 of the second press-in portion 10 is displaced toward the axial first side X1 by a second displacement amount D2 relative to the radial outer end, and the second displacement amount D2 of the second press-in portion becomes greater than the first displacement amount D1 of the first press-in portion.

[0046] In the first press-fitting portion 12, a pressure is generated to press the peripheral portion of the plate 3, that is, the magnetic pole portion 8, downward due to the first displacement amount D1. In the second press-fitting portion 10, a greater pressure is generated to press the peripheral portion of the plate 3, that is, the magnetic pole portion 8, downward due to the second displacement amount D2 that is greater than the first displacement amount D1. As a result, a force is exerted to press the peripheral portion of the plate 3, that is, the magnetic pole portion 8, of the second press-fitting portion 10 toward the peripheral portion of the plate 3, that is, the magnetic pole portion 8, of the first press-fitting portion 12. As a result, a rotor 1 of a rotating electric machine having a structure in which no gap is generated between the stacked plates 3 can be obtained.

[0047] Since the rotor core 2 is formed by stacking the plate materials 3, there is a small stacking gap between the stacked plate materials 3. The stacking gap is several μm, so it does not usually cause any problem. However, due to the pressing of the shaft, the stress balance of the plate materials 3 changes, and the stacking gap sometimes expands, especially near the end of the plate materials 3. The expansion of the stacking gap is more significant in the magnetic pole portion 8 at the peripheral portion, and sometimes it is hundreds of μm. If a gap of this size is generated in the axial direction in the magnetic pole portion 8, when the rotating electric machine is running, the magnetic pole portion 8 vibrates due to the electromagnetic force, and sometimes the magnetic pole portions 8 collide with each other in the axial direction, thereby generating noise. However, in the structure of this embodiment, as described above, it is configured to intentionally change the stress generated on the plate materials 3 stacked at the end of the rotor core 2, and generate stress pressed on the magnetic pole portion 8 near the axial end, so that a stacking gap of the order of hundreds of μm will not be generated on the magnetic pole portion 8.

[0048] In conventional rotating electrical machines, when the rotor core 2 is clamped and fixed from both ends using end plates and rivets, the generation of stacking gaps that cause such noise can be avoided, but this increases the number of parts and assembly steps, resulting in a problem of increased manufacturing cost.

[0049] In the rotor 1 of the rotating electric machine constructed as in the first embodiment, the stacking gap between the plates 3 and the plates 3 at the peripheral edge of the rotor core 2 can be prevented from expanding without using end plates or rivets. The magnetic pole portions 8 at the peripheral edge of the rotor core 2 can be suppressed from vibrating due to the electromagnetic force during the operation of the rotating electric machine and generating noise of the rotating electric machine, and the manufacturing is easy and the cost is low.

[0050] In addition, the structure of the rotor 1 of the rotating electric machine is described as an IPM method with embedded permanent magnets that easily generates noise caused by the vibration of the magnetic pole portion 8, but the structure of the rotor 1 is not limited to this. Regardless of the rotor method, an SPM (Surface Permanent Magnet) method, a subsequent method, an insertion method, etc., can obtain effects corresponding to the structure of each method.

[0051] <Manufacturing method>

[0052] A method for manufacturing the rotor 1 of the rotating electrical machine disclosed in Embodiment 1 is described. A manufacturing method includes:

[0053] (1) forming the first press-fit portion 12 by laminating a first annular plate material of a magnetic material having an inner diameter smaller than the outer diameter of the shaft 4;

[0054] (2) forming the second press-fit portion 10 by laminating a second plate material having a circular ring shape and having a smaller inner diameter than the first plate material;

[0055] (3) a step of forming the rotor core 2 by laminating a laminated first plate material having the first press-fit portion 12 and a laminated second plate material having the second press-fit portion 10; and

[0056] (4) The step of press-fitting the shaft 4 from the first press-fit portion 12 to the first press-fit portion 12 and the second press-fit portion 10. The rotor 1 of the rotating electrical machine according to the first embodiment can be manufactured by the above-described manufacturing method.

[0057] Here, the order of step (1) and step (2) is irrelevant. In addition, steps (1), (2), and (3) may be performed simultaneously. For example, after the first plate is stacked, the second plate may be stacked thereon. In addition, after the second plate is stacked, the first plate may be stacked thereon. Steps (1), (2), and (3) are used to prepare the rotor core 2, and step (4) is performed as follows. Figure 2 As shown, it is used to press the shaft 4 into the rotor core 2.

[0058] By the manufacturing method described above, in the rotor 1 of the rotating electrical machine of the first embodiment, it is possible to prevent the stacking gap between the plates 3 and the plates 3 at the peripheral portion of the rotor core 2 from expanding without using end plates and rivets. The noise of the rotating electrical machine generated by the vibration of the magnetic pole portion 8 at the peripheral portion of the rotor core 2 due to the electromagnetic force during the operation of the rotating electrical machine can be suppressed, and the assembly process of the end plates and rivets is unnecessary, so the manufacturing is easy and the cost is low.

[0059] 2. Implementation Method 2

[0060] Hereinafter, a rotor 1 of a rotating electrical machine device according to a second embodiment of the present application will be described with reference to the drawings. Figure 4 It is a cross-sectional view showing a rotor 1 of a rotating electrical machine device according to the second embodiment. Figure 5 It is a cross-sectional view showing the press-fitting direction of the shaft 4 of the rotor core 2 of the rotating electrical machine device according to the second embodiment. Figure 6 It is a cross-sectional view showing deformation of the plate material 3 of the first press-fit portion 12 and the second press-fit portion 10 of the rotor core 2 of the rotating electrical machine device according to the second embodiment. Figure 7 It is a cross-sectional view showing deformation of the plate material 3 at the first press-fit portion 12 and the non-press-fit portion 11 of the rotor core 2 of the rotating electrical machine device according to the second embodiment.

[0061] The rotor 1 of the rotating electrical machine device according to embodiment 2 differs from the rotor 1 of the rotating electrical machine according to embodiment 1 in that a ring-shaped plate 3 of a magnetic material constituting a rotor core has a recessed portion formed on one surface and a protrusion formed on another surface, and the recessed portions and protrusions of adjacent plates are embedded and fixed.

[0062] Figures 4 to 7The rotor core 2 fits and fixes the concave and convex parts of the plate 3. The situation where the concave and convex parts are fit and fixed as described above is called fixing by punching and crimping. Punching and crimping is also called tenon crimping, protrusion crimping, circular crimping or V-shaped crimping, and is a technology used when stacking and fixing flat plates. Here, punching and crimping is a technology that uses a punching machine to punch a small diameter cylindrical shape on the plate 3 to fit and fix the concave and convex parts of the adjacent plates. The tenon or protrusion is not cylindrical, but may be cylindrical with a round head, conical, polygonal column, polygonal column with a round head, or polygonal pyramid. In addition, the cross-section of the tenon or protrusion may be elliptical or rectangular. The tenon or protrusion may be added by methods other than stamping, such as casting, forging, welding, cutting, etc.

[0063] Figures 4 to 7 The figure shows a state where the plate materials 3 are stacked and fixed by punching and pressing. Figures 4 to 6 The case where the uppermost plate material 3 has no protrusions and the recesses are provided as through holes is shown.

[0064] Since the rotor core 2 is formed by stacking the sheet materials 3 by punching and pressing, there is a tiny stacking gap between the stacked sheets 3. The stacking gap is a few μm, so it usually does not cause any problems, but due to the pressing of the shaft 4, the stress balance of the sheet materials 3 changes, especially near the peripheral edge of the sheet materials 3, and the stacking gap sometimes expands. The expansion of the stacking gap is more significant in the magnetic pole portion 8 on the outer diameter side, sometimes hundreds of μm. Since there is a punching and pressing position 7 on the inner diameter side, there is a deformation that uses the pressing position 7 as a fulcrum and opens on the outer diameter side, which is also one of the main reasons. If an axial gap of this size is generated in part of the magnetic pole portion 8, the magnetic pole portion 8 vibrates due to the electromagnetic force when the rotating motor is running, and sometimes the magnetic pole portions 8 collide with each other in the axial direction to generate noise. However, in the structure of the present embodiment, as described above, the stress generated in the cores stacked at the peripheral portion of the rotor core 2 is intentionally changed to generate stress pressing on the magnetic pole portion 8 near the axial end, so that a stacking gap of the order of hundreds of μm is not generated in the magnetic pole portion 8.

[0065] In addition, the rotor 1 of the rotating electrical machine device involved in embodiment 2 has a non-pressed portion 11, which is an axial section on the inner circumferential surface on the opposite side of the second press-fit portion 10 and adjacent to the first press-fit portion 12, and the inner diameter of the non-press-fit portion 11 is larger than the outer diameter of the shaft 4.

[0066] Figure 4 The size of the center hole 9 of the end portion of the rotor core 2 on the side where the shaft is first inserted is set larger than the outer diameter of the shaft 4, thereby forming a non-pressed portion 11 where the shaft 4 is not pressed. Figure 5The figure shows the direction in which the shaft 4 is pressed into the rotor core 2 , and the shaft 4 is pressed in the direction of the arrow in the figure.

[0067] Next, the function and effect of the rotor 1 of the present embodiment constructed as described above will be described. The plate 3 of the second embodiment is composed of an electromagnetic steel plate with a plate thickness of 0.5 mm, but when the shaft 4 is pressed into the center hole 9 of the thin plate, a stress that deforms into a coil spring shape is generated in the thin plate, so that the center portion becomes convex in the pressing direction. This stress does not act on the plate 3 of the non-pressed portion 11, and the plate 3 of the non-pressed portion 11 remains flat. Stress that deforms into a coil spring shape is generated on the plate 3 of the first press-in portion 12 in the axial center portion, as shown in FIG. Figure 7 As schematically shown in FIG. 1 , the magnetic pole portion 8 of the first press-fit portion 12 is not flat, but deformed into a coil spring shape. As a result, a force that presses the magnetic pole portion 8 of the first press-fit portion 12 toward the magnetic pole portion 8 of the non-press-fit portion 11 is exerted.

[0068] In the rotor core 2, the shaft 4 is pressed and fixed in a state where the magnetic pole portions 8 of the plate 3 are in close contact with each other. The non-pressed portion 11 is fixed by blanking and pressing at the pressing position 7, and the portion of the first press-in portion 12 in contact with the shaft 4 is deformed by the press-in to prevent the shaft 4 from being deformed. Figure 7 Therefore, the peripheral edge of the plate 3 of the first press-fit portion 12 and the non-press-fit portion 11 presses against each other, and the stress on the closed side acts, thereby preventing the stacking gap of the peripheral edge of the plate 3 from expanding.

[0069] 3. Implementation Method 3

[0070] Hereinafter, a rotor 1 of a rotating electrical machine device according to a third embodiment of the present application will be described with reference to the drawings. Figure 8 It is a cross-sectional view showing the rotor 1 of the rotating electrical machine device according to the third embodiment. Fig. 9 It is a cross-sectional view showing the press-fitting direction of the shaft 4 of the rotor core 2 of the rotating electrical machine device according to the third embodiment. Fig.10 It is a cross-sectional view showing a portion of the rotor 1 of the rotating electrical machine device according to the third embodiment, into which a magnet is inserted. Fig.11 It is a cross-sectional view showing deformation of the plate material 3 of the first press-fit portion 12 and the second press-fit portion 10 of the rotor core 2 of the rotating electrical machine device according to the third embodiment. Fig.12 It is a cross-sectional view showing deformation of the plate material 3 at the first press-fit portion 12 and the non-press-fit portion 11 of the rotor core 2 of the rotating electrical machine device according to the third embodiment.

[0071] Embodiment 3 discloses a method in which a magnet insertion hole, namely, a gap 5 parallel to the shaft 4 is provided in the rotor core 2, and a magnet 6 is inserted into the gap 5. A permanent magnet is used as the magnet 6. Figures 8 to 10In the embodiment, a plurality of gaps 5 are provided in the rotor core 2, and a plurality of magnets 6 are inserted into each of the gaps 5, thereby forming a rotor of a so-called IPM method in which a permanent magnet is embedded.

[0072] Fig. 9 The figure shows the direction in which the shaft 4 is pressed into the rotor core 2. The shaft 4 is pressed in the direction of the arrow in the figure. At this moment, the magnet 6 is not inserted into the gap 5 of the rotor core 2. Figure 8 and Fig.10 4 is a cross-sectional view showing a state where the magnet 6 is inserted into the gap 5, at a section perpendicular to the axis 4. The case where the magnet 6 is a flat rectangular parallelepiped is shown.

[0073] Inserting the magnet 6 into the gap 5 helps fix the plate 3 constituting the rotor core 2. This is because, by inserting the magnet 6, the magnet 6 contacts the plate 3, and the peripheral portion of the plate 3, that is, the magnetic pole portion 8, can be prevented from moving and vibrating. In addition, by inserting the magnet 6 into the gap 5, it is also possible to help maintain the closed side stress of the peripheral portion of the plate 3, that is, the magnetic pole portion 8, between the first press-in portion 12 and the second press-in portion 10, or the closed side stress of the peripheral portion of the plate 3, that is, the magnetic pole portion 8, between the first press-in portion 12 and the non-press-in portion 11.

[0074] In addition, Embodiment 3 discloses that a gap 5 is provided in the rotor core 2 in parallel with the shaft 4, a magnet 6 is inserted into the gap 5, and one end of the magnet 6 is provided in a region where a non-pressed portion 11 exists in the radial direction of the rotor core 2. A permanent magnet is used as the magnet 6. Figure 8 In the embodiment, a plurality of gaps 5 are provided in the rotor core 2, and a plurality of magnets 6 are inserted into each gap 5, with the ends of the magnets 6 being located in the region of the non-pressed portion 11, thereby forming a rotor of a so-called IPM method in which permanent magnets are embedded. The magnets 6 are inserted into the gaps 5, for example, from the second press-fit portion 10 side.

[0075] The axial length of the magnet 6 is smaller than the axial length of the rotor core 2, and the magnet 6 is of a size that does not protrude from the rotor core 2. The end surface of the magnet 6 on the non-pressed portion 11 side of the rotor core 2 after the magnet 6 is inserted is set so as to fall within the range of the axial length of the non-pressed portion 11. Therefore, when the magnet is fixed near the end of the rotor core where the second press-fit portion exists, it is easy to set the magnet so that it does not protrude from the rotor core, thereby obtaining a rotor 1 with good assembly properties and high quality.

[0076] In Embodiment 3, a gap 5 is provided in rotor core 2 parallel to shaft 4, magnet 6 is inserted into gap 5, and concave and convex portions of plate 3 are provided closer to the axis than magnet 6. Magnet 6 is a permanent magnet.

[0077] When the rotor core 2 is formed by laminating the plates 3 of the electromagnetic steel sheets, punching and pressing are used. Figures 8 to 12 As shown, the crimping position 7 is arranged radially inward of the rotor core 2 relative to the magnet 6. This is because, since the magnetic pole portion 8 is formed radially outward of the magnet 6, if a crimping portion is provided in this portion, the magnetic resistance increases, the desired characteristics may not be obtained, and the size required for configuring the crimping portion cannot be ensured.

[0078] By setting the crimping position 7 radially inward of the rotor core 2 relative to the magnet 6, the increase in magnetic resistance caused by crimping can be prevented, thereby achieving both maintaining and improving the performance of the rotating electrical machine and preventing the stacking gap between the plates 3 of the rotor core 2 from expanding due to punching crimping.

[0079] Although the present application describes various exemplary embodiments and examples, the various features, methods and functions described in one or more embodiments are not limited to the application of specific embodiments and can be applied to the embodiments individually or in various combinations. Therefore, it can be considered that countless variations that are not illustrated are also included in the technical scope disclosed in the present application specification. For example, it is set to include the case where at least one constituent element is deformed, added or omitted, and the case where at least one constituent element is extracted and combined with constituent elements of other embodiments.

[0080] Description of symbols

[0081] 1 rotor, 2 rotor core, 3 plate, 4 shaft, 5 gap, 6 magnet, 7 pressing position, 9 center hole, 10 second pressing part, 11 non-pressing part, 12 first pressing part.

Claims

1. A rotor of a rotating electrical machine, characterized in that: include: A rotor core having annular plates of magnetic material stacked in the axial direction; as well as a shaft pressed into the inner circumference of the rotor core, The inner peripheral surface has a first press-in portion, which is a section in the axial direction of the shaft that is pressed into the first press-in portion; and a second press-in portion, which is a section in the axial direction adjacent to the first press-in portion and is pressed into the shaft with a larger interference than the first press-in portion. The shaft is pressed into the inner peripheral surface of the rotor core from the first press-fit portion. The plate of the rotor core has a concave portion formed on one surface and a convex portion formed on the other surface, and the concave portion and the convex portion of the plate adjacent to each other are fitted and fixed, A gap is provided in the rotor core in parallel with the axis, a permanent magnet is inserted into the gap, and the concave portion and the convex portion of the plate are provided radially inward of the permanent magnet.

2. The rotor of a rotating electrical machine according to claim 1, wherein: The inner peripheral surface has a non-press-fit portion which is a section in the axial direction opposite to the second press-fit portion and adjacent to the first press-fit portion, and the inner diameter of the non-press-fit portion is larger than the outer diameter of the shaft.

3. The rotor of a rotating electrical machine according to claim 1 or 2, characterized in that: A gap is provided in the rotor core in parallel with the axis, and a permanent magnet is inserted into the gap.

4. The rotor of a rotating electrical machine according to claim 2, wherein: A gap is provided in the rotor core in parallel with the axis, a permanent magnet is inserted into the gap, and one end of the permanent magnet is provided in a region where the non-press-fit portion exists in a radial direction of the rotor core.

5. A rotor of a rotating electrical machine, characterized in that: include: A rotor core having annular plates of magnetic material stacked in the axial direction; as well as a shaft pressed into the inner circumference of the rotor core, The inner peripheral surface has a first press-in portion, which is a section in the axial direction pressing the shaft; and a second press-in portion, which is a section in the axial direction adjacent to the first press-in portion and presses the shaft with a pressure greater than that of the first press-in portion, Taking the direction from the first press-in portion toward the second press-in portion as the first axial side, the radial inner end of the plate of the first press-in portion is displaced toward the first axial side relative to the radial outer end, the radial inner end of the plate of the second press-in portion is displaced toward the first axial side relative to the radial outer end, and the displacement amount of the second press-in portion is greater than the displacement amount of the first press-in portion, The plate of the rotor core has a concave portion formed on one surface and a convex portion formed on the other surface, and the concave portion and the convex portion of the plate adjacent to each other are fitted and fixed, A gap is provided in the rotor core in parallel with the axis, a permanent magnet is inserted into the gap, and the concave portion and the convex portion of the plate are provided radially inward of the permanent magnet.

6. The rotor of a rotating electrical machine according to claim 5, wherein: The inner peripheral surface has a non-press-fit portion which is a section in the axial direction opposite to the second press-fit portion and adjacent to the first press-fit portion, and the inner diameter of the non-press-fit portion is larger than the outer diameter of the shaft.

7. The rotor of a rotating electrical machine according to claim 5 or 6, characterized in that: A gap is provided in the rotor core in parallel with the axis, and a permanent magnet is inserted into the gap.

8. The rotor of a rotating electrical machine according to claim 6, wherein: A gap is provided in the rotor core in parallel with the axis, a permanent magnet is inserted into the gap, and one end of the permanent magnet is provided in a region where the non-press-fit portion exists in a radial direction of the rotor core.

9. A method for manufacturing a rotor of a rotating electrical machine, characterized in that: include: The step of forming a first press-fit portion by stacking a first annular plate material of a magnetic material having an inner diameter smaller than an outer diameter of the shaft; A step of forming a second press-fit portion by laminating the annular second plate material of the magnetic material having a smaller inner diameter than the first plate material; a step of laminating the first press-in portion and the second press-in portion; A step of pressing the shaft into the first pressing portion and the second pressing portion from one side of the first pressing portion; The first plate and the second plate have a concave portion formed on one surface and a convex portion formed on the other surface, and the concave portion and the convex portion of the first plate and the second plate adjacent to each other are fitted and fixed; as well as A gap is provided in the rotor core in parallel with the axis, a permanent magnet is inserted into the gap, and the concave portion and the convex portion of the first plate member and the second plate member are provided radially inward of the permanent magnet.

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