Rotating electric machine

Abstract

The present application provides a rotating electrical machine capable of reducing stress concentration at a thin wall portion of a rotor core. A rotating electrical machine (100) is provided with a stator (200) and a rotor (300), the rotor and the stator (200) being disposed with a magnetic gap therebetween, the rotor comprising a rotor core (311) in which electromagnetic steel sheets are laminated, and a plurality of permanent magnets (321) disposed in the rotor core (311) at equal intervals in the circumferential direction, the rotating electrical machine is provided with axial holding bodies (331) disposed on the inside in the radial direction of permanent magnets (321), the number of the axial holding bodies being half of the number of magnetic poles of a rotor (300), rotation holding bodies (400) configured in a cylindrical shape, rotor cores (311) disposed in an outer cylinder portion, and suppression structures (351) that suppress bending moments that take the axial holding bodies (331) as fulcrums.

Description

Technical Field

[0001] The present application relates to a rotating electrical machine. Background Art

[0002] In existing rotating electrical machines, for example, in a rotor structure in which the rotor core of a rotating electrical machine commonly used in electric vehicles is retained by a cylindrical rotating retaining body connected to a shaft, a structure is sometimes adopted in which the ratio of the diameter of the rotating retaining body to the outer diameter of the rotor core is high, resulting in a small radial thickness of the rotor core (for example, refer to patent document 1).

[0003] In addition, a structure is shown which has a shape in which the inner diameter portion is welded while fixing the stacking of the rotor core in order to ensure centrifugal strength in the rotor structure, and is provided with stress release holes for suppressing thermal distortion during welding (for example, refer to patent document 2). Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2012-100477 Patent Document 2: WO2014 / 208582A1 Summary of the invention Technical problem to be solved by the invention

[0005] In the above-mentioned existing rotating electrical machine, in the structure of patent document 1, a rotor structure with a small radial thickness of the rotor core is adopted as described above. Therefore, there is the following technical problem: when the rotor core is pressed into the rotating retaining body, a bending moment with the riveted part as the fulcrum is generated, causing stress concentration at the thin-walled part of the outer diameter of the core of the rotor core, thereby reducing the strength of the rotor core.

[0006] Furthermore, in Patent Document 2, a sufficient margin is left in the radial thickness for stacking fixation achieved by welding, and stress release holes are provided for suppressing thermal distortion during welding. However, the stress reduction effect is poor when the radial thickness is small, and therefore there is a problem in that the stress release holes need to be made larger.

[0007] The present application is made to solve the above-mentioned problems, and an object thereof is to provide a rotating electric machine capable of reducing stress concentration in a thin-walled portion of a rotor core. Technical solutions adopted to solve technical problems

[0008] The rotating electric machine disclosed in the present application includes: a stator; and a rotor, wherein the rotor is arranged with a magnetic gap portion between the stator and the rotor, the rotor being composed of a rotor core and a plurality of permanent magnets, the rotor core being stacked with electromagnetic steel plates, the plurality of permanent magnets being arranged at equal intervals on the rotor core in the circumferential direction, wherein the rotating electric machine is provided with an axial retaining body, a rotating retaining body and a suppression structure, the axial retaining body being arranged on the radial inner side of the permanent magnet in a number half the number of magnetic poles of the rotor, the rotating retaining body being configured in a cylindrical shape, the rotor core being arranged on the outer cylinder, and the suppression structure suppressing the bending moment with the axial retaining body as the fulcrum. Effects of the Invention

[0009] According to the rotating motor disclosed in the present application, since axial retaining bodies having a number half the number of magnetic poles of the rotor are arranged on the radial inner side of the permanent magnet, and a rotor core is arranged on the outer tube portion of the rotating retaining body which is formed into a cylindrical shape, the bending moment with the axial retaining bodies as fulcrums is suppressed by suppressing the structure, thereby obtaining a rotating motor which can reduce stress concentration in the thin-walled portion of the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view showing the rotating electrical machine according to the first embodiment. Figure 2 It is a perspective view showing a rotor core of the rotating electrical machine according to the first embodiment. Figure 3 It is a perspective view showing the rotation holding body of the rotating electrical machine according to the first embodiment. Figure 4 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the first embodiment. Figure 5 The rotating electrical machine of the first embodiment Figure 4 An enlarged cross-sectional view of the main parts. Figure 6 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the second embodiment. Figure 7 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the second embodiment. Figure 8 It is a cross-sectional view showing a modified example of the rotation holding body of the rotating electrical machine according to the third embodiment. Fig. 9 It is a cross-sectional view showing a modified example of the rotation holding body of the rotating electrical machine according to the third embodiment. Fig.10 It is a cross-sectional view of a main part showing a modification example in the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the fourth embodiment. Fig.11It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the fifth embodiment. Fig.12 The rotating electrical machine of the fifth embodiment Fig.11 An enlarged cross-sectional view of the main parts. Fig.13 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the sixth embodiment. Fig.14 The rotating electrical machine of the sixth embodiment Fig.13 An enlarged cross-sectional view of the main parts. DETAILED DESCRIPTION

[0011] Implementation Method 1 The following is based on Figures 1 to 5 , implementation mode 1 of the present application is described. In each figure, the same or corresponding components and parts are marked with the same symbols for description. Figure 1 It is a cross-sectional view showing the rotating electrical machine according to the first embodiment. Figure 2 It is a perspective view showing a rotor core of the rotating electrical machine according to the first embodiment. Figure 3 It is a perspective view showing the rotation holding body of the rotating electrical machine according to the first embodiment. Figure 4 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the first embodiment. Figure 5 The rotating electrical machine of the first embodiment Figure 4 An enlarged cross-sectional view of the main parts.

[0012] like Figure 1 As shown, the rotating electrical machine 100 includes a housing 210 including a bottomed cylindrical frame 211 and an end plate 212 that closes an opening of the frame 211 , and an armature 220 that is a stator fixed to the cylindrical portion of the frame 211 in an embedded state.

[0013] The armature 220 is composed of a plurality of coils 221 for generating magnetic flux, a terminal plate 222 for distributing current to the plurality of coils 221 , and an armature core 223 for allowing the magnetic flux to flow. The coils 221 , the terminal plate 222 , and the armature core 223 are respectively fixed to the bobbin 224 and are electrically insulated from the bobbin 224 .

[0014] In addition, three terminal blocks 222 are provided to form three phases, and each terminal block 222 is connected to the coil 221 of a different phase.

[0015] The rotor 300 is disposed with the armature 220 interposed therebetween with a magnetic gap, and includes a rotor core 311 formed by stacking electromagnetic steel plates, and a plurality of permanent magnets 321 disposed at equal intervals in the circumferential direction on the rotor core 311 .

[0016] The rotor core 311 is disposed on the outer cylinder portion of the cylindrical rotation support body 400, and is structurally connected to the rotor 300 and extends in the rotation axis direction. The rotation support body 400 is rotatably supported by a bearing 500 provided on the housing 210.

[0017] According to the above structure, a structure can be adopted in which the ratio of the diameter of the rotating retaining body 400 to the outer diameter of the rotor core 311 is high, and the radial thickness of the rotating shaft of the rotor core 311 is thin. A structure that is advantageous for cost reduction and weight reduction can be adopted, and the cost can be reduced by reducing the amount of electromagnetic steel sheets used to constitute the rotor core 311, or, for the material of the rotating retaining body that retains the rotor core 311, a space can be provided between the rotating shaft and the cylindrical rotating retaining body 400 to make the rotating shaft component lighter.

[0018] In addition, in the above Figure 1 In the example of the structure shown, the case where the rotating retaining body 400 that holds the rotor core 311 is directly supported by the bearing 500 to be rotatable is shown. However, it is not limited to this. For example, it can also be set as follows: a shaft (not shown) with a smaller diameter than the rotating retaining body 400 is additionally provided at the position of the rotating shaft through a hole in the inner diameter portion of the rotating retaining body 400, and the rotating shaft is supported by the bearing 500 to be rotatable. In addition, it can also be set as follows: the rotating retaining body 400 is integrally connected to the above-mentioned shaft by a connecting member (not shown) extending in the radial direction, so as to serve as a rotating retaining body component that holds the rotor core 311.

[0019] Thus, even in the case of a structure in which a shaft is provided through a hole in the inner diameter portion of the rotation holding body 400, a space can be provided between the rotation shaft and the shaft and the rotation holding body to enable the rotation holding body to be provided in a manner similar to that of the rotation holding body. Figure 1 The illustrated structure also facilitates a lightweight structure.

[0020] In addition, the permanent magnets 321 are buried in the outer peripheral surface side of the rotor core 311 and are arranged at equal intervals in the circumferential direction to form magnetic poles. A silicone resin adhesive is used between the permanent magnets 321 and the rotor core 311, which is heated and cured to structurally fix the permanent magnets 321.

[0021] like Figure 2 As shown, at the rotor core 311, the polarities of the plurality of permanent magnets 321 arranged at equal intervals in the circumferential direction of the rotating shaft are alternately arranged, and on the radial inner side of the permanent magnets 321, axial retaining bodies 331 are arranged at equal intervals with a number half the number of magnetic poles of the rotor 300. A core fitting portion 340 for positioning the rotor core 311 in the circumferential direction is provided on the inner circumference of the rotor core 311.

[0022] On the radially inner side of the axial retaining body 331, a recess 351 is provided as a suppression structure on the inner circumference of the rotor core 311. The recess 351 is arranged in a number half the number of poles of the axial retaining body 331, and suppresses the bending moment with the axial retaining body 331 as a fulcrum. It is characterized in that the circumferential width of the recess 351 as the suppression structure is set to be greater than the angle corresponding to the number of poles of the permanent magnet 321.

[0023] The axial retainer 331 has a V-shaped riveted structure, so that when the electromagnetic steel sheet is pressed, the cross-sectional shape in the circumferential direction of the rotating shaft is V-shaped and is retained in the direction of the rotating shaft during punching. In addition, eddy current loss is easily generated due to residual stress during punching and reduced insulation between layers. Therefore, the axial retainer 331 is characterized in that it is arranged at a position further inside the permanent magnet 321 in the radial direction of the rotating shaft to reduce the influence of magnetic properties.

[0024] In addition, if Figure 3 As shown, the rotating retaining body 400 is characterized by including an outer cylinder portion 410 of the rotating retaining body 400 into which the rotor core 311 is pressed, and a rotating retaining inner cylinder portion 420 for setting a cavity in the inner diameter portion of the rotating retaining body 400, and a structure capable of installing a vibration suppression component during the transmission of the shaft or axial force to the rotating retaining inner cylinder portion 420.

[0025] In addition, the rotating retaining body 400 is characterized in that it has a rotating retaining fitting part 440 for positioning the core fitting part 340 of the rotor core 311, and a small gap is provided between the core fitting part 340 of the rotor core 311 and the rotating retaining fitting part 440, so that assembly can be facilitated. In the case where positioning accuracy is required, the core fitting part 340 of the rotor core 311 and the rotating retaining fitting part 440 may be provided at multiple locations instead of at one location to adjust the positioning.

[0026] Figure 4 as well as Figure 5 6 shows a rotor structure 600 in which a rotor 300 is arranged on a rotating retaining body 400. The structure is characterized in that the rotor core 311 and the rotating retaining body 400 are positioned and arranged in the circumferential direction of the rotating shaft through the core fitting portion 340 and the rotating retaining fitting portion 440, and the rotor 300 is pressed and fitted into the rotating retaining body 400. Fitting can also be performed by sintering or cold fitting.

[0027] The invention is characterized in that, when the angle 601 between the core fitting portion 340 of the rotor core 311 and the axial retaining body 331 in the circumferential direction of the rotation axis is set to θ1 and the width angle 611 of the concave portion 351 as the restraining structure in the circumferential direction of the rotation axis is set to θ2, the following relationship is achieved: [Mathematical formula 1] θ1 ≤ θ2 ………… (Formula 1)

[0028] Furthermore, the present invention is characterized in that, when the outermost diameter portion 602 of the rotor core 311 is Φa and the innermost diameter portion 603 of the rotor core 311 is Φb, the following relationship is established: [Mathematical formula 2] Furthermore, the thickness of the rotor core 311 in the radial direction of the rotating shaft is less than 10% of the outermost diameter portion 602 .

[0029] In addition, the structure is characterized in that, when the diameter 604 of the rotation holding inner cylinder portion 420 of the rotation holding body 400 is set to Φc, the following relationship is established: [Mathematical formula 3] Furthermore, the thickness of the rotor holder 400 in the radial direction of the rotation axis is less than or equal to 10% of the outermost diameter portion 602 of the rotor core 311 .

[0030] As in the basic structure of the present embodiment 1, the rotor 300 adopts the following structure, i.e., an axial retaining body 331 and a recess 351 are arranged for the rotor core 311 fixed to the outer cylinder portion of the cylindrical rotating retaining body 400 connected to the rotating shaft, the axial retaining body 331 is arranged at equal intervals on the radial inner side of the permanent magnet 321 by half the number of magnetic poles of the rotor 300, and the recess 351 is a suppression structure arranged on the radial inner side of the rotating shaft of the axial retaining body 331. Thus, while adopting a rotor structure in which the radial thickness of the rotor core 311 is small, a structure in which a suppression structure, i.e., the recess 351, is provided for suppressing the bending moment generated with the axial retaining body 311 as a fulcrum when the rotor core 311 is pressed into the rotating retaining body 400 is adopted.

[0031] As a result, it is possible to suppress the generation of local stress in the outermost diameter portion 602 of the rotor core 311 and the portion of the permanent magnet 321 where the thickness in the direction of the rotation axis is small, and when the ratio of the thickness in the direction of the rotation axis of the rotor core 311 or the rotating retaining body 400 to the outer diameter of the outermost diameter portion 602 is less than 10% as mentioned above, as described below, the effect of the present application is more significant.

[0032] When the axial deviation is large when the rotor core 311 is fitted with the rotating retaining body 400, when the innermost diameter portion 603 of the rotor core 311 is corrected in the direction of the rotating axis relative to the rotating retaining body 400, the bending moment with the axial retaining body 331 as the fulcrum is transmitted to the next layer in the direction of the rotating axis of the rotor core 311 via the axial retaining body 331. At this time, when the radial thickness of the rotor core 311 in the rotating axis is less than 10% of the outermost diameter portion 602 and is small, local stress is generated in the outermost diameter portion 602 and the portion with small radial thickness of the permanent magnet 321, which becomes a major factor causing fatigue failure during high-speed rotation.

[0033] According to the structure of the present embodiment 1, it is characterized by the following structure, that is, by providing a restraining structure body, i.e., a recessed portion 351, which is arranged on the inner side of the radial direction of the rotation axis of the axial retaining body 331 and is arranged on the inner diameter portion of the rotor core 311, the bending moment generated when the innermost diameter portion 603 of the rotor core 311 is corrected in the direction of the rotation axis will not be transmitted to the axial retaining body 311, and local stress is not easily generated in the outermost diameter portion 602 and the portion of the permanent magnet 321 with a small thickness in the radial direction of the rotation axis.

[0034] Implementation Method 2 Next, based on Figure 6 and Figure 7 , implementation mode 2 of the present application is described. In each figure, the same or corresponding components and parts are marked with the same symbols for description. Figure 6 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the second embodiment. Figure 7 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the second embodiment.

[0035] Figure 6 as well as Figure 7 FIG. 7 shows a rotor structure 700 in which a rotor 300 is arranged on a rotating support 400. In the second embodiment, as shown in FIG. Figure 6 The cross section at line A-A and Figure 7 As shown in the cross section taken along the line BB of , the permanent magnet 321 has a structure divided into two in the direction of the rotation axis.

[0036] The permanent magnet 321 may be an undivided integrally formed structure, or may be a bonded magnet that is not a sintered magnet but is directly injection molded to the rotor core 311, or may be an excitation winding formed by inserting an armature winding into the core. In the second embodiment, by dividing the permanent magnet 321 along the direction of the rotation axis, the most suitable number of divisions can be set according to the shape before the aspect ratio of the area cut to the radial surface by cutting. Thus, it is characterized in that the machinability can be improved and the processing cost can be reduced, and the magnetic domain orientation in the permanent magnet 321 can be easily adjusted, and the magnetic properties can be easily stabilized.

[0037] In addition, it is characterized by the following structure, namely, the recess 351 arranged on the inner side of the axial retaining body 331 in the radial direction of the rotating axis is arranged in the direction of the rotating axis, and the thickness of the recess 351 in the radial direction of the rotating axis is greater than the interference when the rotor core 311 and the rotating retaining body 400 are pressed in.

[0038] Implementation 3 Next, based on Figure 8 and Fig. 9 , implementation mode 3 of the present application is described. In each figure, the same or corresponding components and parts are marked with the same symbols for description. Figure 8 It is a cross-sectional view showing a modified example of the rotation holding body of the rotating electrical machine according to the third embodiment. Fig. 9 It is a cross-sectional view showing a modified example of the rotation holding body of the rotating electrical machine according to the third embodiment.

[0039] Figure 8 and Fig. 9 FIG. 4 shows a structure of a modified example of the rotation holding body 400 in the first embodiment. Figure 1 As shown, the rotor core 311 and the rotation retaining body 400 are press-fitted with an interference fit, and are press-fitted and retained.

[0040] Figure 8 and Fig. 9 The following structure is set, that is, the structure of the rotating retaining body 400 of embodiment 1 is changed. For example, in a structure in which the recess 351 is not provided on the radial inner side of the rotating axis of the rotor core 311, or in a case where the abutment state of each component is unstable when pressed in due to the accuracy of the inner diameter of the rotor core 311 and the outer diameter of the rotating retaining body 400, in order to further improve the fastening force from the structural aspect, a restraining structure, i.e., a knurled portion 401 or a crimping portion (Japanese: ステーキング) 402 or other recessed or convex portions is provided on the outer cylinder portion of the rotating retaining body 400.

[0041] In addition, the knurled portion 401 or the crimped portion 402 or other concave and convex portions of the suppression structure provided on the outer cylinder of the rotating retaining body 400 can function as a substitute for the suppression structure of the bending moment generated with the axial retaining body 331 as a fulcrum formed by providing the concave portion 351 on the radial inner side of the rotating axis of the rotor core 311 in the structure of the first embodiment. In other words, the concave portion 351 provided on the inner diameter of the rotor core 311, which functions as the suppression structure of the bending moment in the first embodiment, can also be provided on the rotating retaining body 400 side.

[0042] Even if a recess is provided on the rotating retaining body side, especially on the outer cylinder portion of the rotating retaining body, it can be provided at various positions overlapping the axial retaining body in the circumferential direction, similarly to the recess 351 provided on the inner diameter of the rotor core 311, so that it can effectively function as a means of suppressing the above-mentioned bending moment.

[0043] Implementation 4 based on Fig.10 Implementation method 4 of the present application is described. Fig.10 It is a cross-sectional view of a main part showing a modification example in the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the fourth embodiment.

[0044] In the above-mentioned embodiments, as a specific example of the axial retaining body 331, a V-shaped riveted structure having a longitudinal direction parallel to the circumferential direction of the rotating shaft is used as an example for explanation, but in the present embodiment 3, it is also possible to Fig.10 As shown in the figure, a round riveted core 370 using a round rivet 371 is formed in the axial retaining body 331. In addition, although not shown in the figure, axial retaining methods such as pin riveting, threaded fixing, welding, and bonding can also be used. In addition, the axial retaining body 331 may not be arranged at equal intervals in the circumferential direction in the number of half the number of magnetic poles, but may be arranged in multiple locations from the perspective of structural strength and magnetic circuit formation.

[0045] Implementation method 5 Next, based on Fig.11 and Fig.12 , implementation mode 5 of the present application is described. In each figure, the same or corresponding components and parts are marked with the same symbols for description. Fig.11 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the fifth embodiment. Fig.12 The rotating electrical machine of the fifth embodiment Fig.11 An enlarged cross-sectional view of the main parts.

[0046] Fig.11 as well as Fig.12 3 shows a rotor structure 800 in which the rotor 300 is arranged on the rotating retaining body 400. The structure of the rotor of the present embodiment 5 is a structure composed of a rotating shaft radial V-shaped rivet core 811, a rotating shaft radial V-shaped rivet 361 as an axial retaining body, a permanent magnet 321, and a rotating retaining outer cylinder portion 410 and a rotating retaining inner cylinder portion 420 of the rotating retaining body 400. As a result, a structure with a relatively thin rotating shaft radial thickness is adopted, similarly to the rotor of the above-mentioned embodiment 1.

[0047] Furthermore, in the present embodiment 5, as an alternative to the structure including the axial retaining body 331 in the above-mentioned embodiment 1 and the recess 351 arranged on the radial inner side of its rotating shaft, the following structure is formed, namely, by adopting a structure in which the radial V-shaped rivets 361 of the rotating shaft serving as the axial retaining body are arranged at equal intervals along the circumferential direction on the radial inner side of the permanent magnet 321 at half the number of magnetic poles, thereby making it less likely for local stress to be generated in a portion with a small radial thickness of the rotating shaft.

[0048] In more detail, Fig.11 as well as Fig.12 As shown, the rotating shaft radial V-shaped riveted core 811 and the permanent magnet 321 are arranged at equal intervals in the circumferential direction of the rotating shaft, and the polarities of the permanent magnets 321 are arranged alternately. On the radial inner side of the permanent magnet 321, the rotating shaft radial V-shaped rivet parts 361 are arranged at equal intervals in the circumferential direction with a number half the number of magnetic poles, including a core body fitting portion 340 for positioning the rotating shaft radial V-shaped riveted core 811 in the circumferential direction. The rotating shaft radial V-shaped rivet parts 361 have a V-shaped riveted structure, so that when the electromagnetic steel plate is pressed, its cross-sectional shape in the circumferential direction of the rotating shaft is V-shaped and maintained in the direction of the rotating shaft during punching.

[0049] In addition, eddy current loss is easily caused by residual stress during punching and reduced insulation between layers. Therefore, the rotating shaft radial V-shaped rivet 361 is characterized by being arranged at a position further inside the rotating shaft radial permanent magnet 321 to reduce the influence of magnetic properties.

[0050] In addition, it is characterized by a structure in which, when the outermost diameter portion 802 of the rotating shaft radial V-shaped rivet core 811 is set to Φa and the innermost diameter portion 803 of the rotating shaft radial V-shaped rivet core 811 is set to Φb, the following relationship is achieved: [Formula 4] Furthermore, the thickness of the V-shaped rivet core 811 in the radial direction of the rotating axis is less than 10% of the outermost diameter portion 802 .

[0051] In addition, the structure is characterized in that, when the diameter 804 of the rotation holding inner cylinder portion 420 of the rotation holding body 400 is set to Φc, the following relationship is established: [Mathematical formula 5] Furthermore, the thickness of the rotor holder 400 in the radial direction of the rotating shaft is less than 10% of the outermost diameter portion 802 of the rotor core 311 .

[0052] In the case where the axial deviation is large when the rotating shaft radial V-shaped rivet core 811 is engaged with the rotating retaining body 400, when the innermost diameter portion 803 of the rotating shaft radial V-shaped rivet core 811 is corrected in the rotating shaft direction relative to the rotating retaining body 400, no bending moment with the rotating shaft radial V-shaped rivet part 361 as the fulcrum is generated.

[0053] The characteristic structure is that local stress is not easily generated in the outermost diameter portion 802 of the radial V-shaped rivet core 811 and the thin-thickness portion of the permanent magnet 321 in the radial direction of the rotating shaft due to deviation of the radial V-shaped rivet 361 in the radial direction of the rotating shaft.

[0054] As in the basic structure of the present embodiment 5, with respect to the rotor 300, a rotating shaft radial V-shaped rivet 361 is set as an axial retaining body and a suppression structure is arranged circumferentially with half the number of magnetic poles and arranged on the radial inner side of the permanent magnet 321. Thus, it has the function of a suppression structure to suppress the bending moment with the rotating shaft radial V-shaped rivet 361 as a fulcrum when the rotating shaft radial V-shaped rivet core 811 is pressed into the rotating retaining body 400, which is accompanied by a rotor structure with a small radial thickness of the rotor core.

[0055] As a result, it is possible to suppress the generation of local stress in the outermost diameter portion 802 of the rotating shaft radial V-shaped rivet core 811 and the portion where the thickness in the rotating shaft radial direction of the permanent magnet 321 is small. In addition, when the ratio of the rotating shaft radial thickness of the rotating shaft radial V-shaped rivet core 811 or the rotating retaining body 400 to the outer diameter of the outermost diameter portion 802 is less than 10% as described above, as described above, the effect of the present application is more significant.

[0056] Implementation 6 Next, based on Fig.13 and Fig.14 , implementation mode 6 of the present application is described. In each figure, the same or corresponding components and parts are marked with the same symbols for description. Fig.13 It is a cross-sectional view showing the circumferential direction of the rotating shaft of the rotor of the rotating electrical machine according to the sixth embodiment. Fig.14 The rotating electrical machine of the sixth embodiment Fig.13 An enlarged cross-sectional view of the main parts.

[0057] Fig.13 as well as Fig.14 4 shows a rotor structure 900 in which a rotor 300 is arranged on a rotating holding body 400. In this sixth embodiment, as a modification of the fifth embodiment, Fig.13 as well as Fig.14 As shown in the above embodiment 1 Figure 4 and Figure 5A portion of the structure shown is further changed to form a rotating shaft radial V-shaped rivet 361 which serves as an axial retaining body and is arranged on a rotating shaft radial V-shaped rivet core 911 in such a way that its long side direction is rotated 90 degrees to the radial direction of the rotating shaft.

[0058] In addition, eddy current loss is easily caused by residual stress during punching and reduced insulation between layers. Therefore, the rotating shaft radial V-shaped rivet 361 is characterized by being arranged at a position further inside the rotating shaft radial permanent magnet 321 to reduce the influence of magnetic properties.

[0059] Its characteristic is that when the angle 901 between the core fitting portion 340 of the rotor core 311 and the circumferential position of the axial retaining portion 331 is set to θ1 and the width angle 911 of the restraining structure, i.e. the recess 351, in the circumferential direction of the rotating shaft is set to θ2, the relationship θ1≤θ2 is maintained.

[0060] In addition, it is characterized by a structure in which, when the outermost diameter portion 902 of the rotor core 311 is Φa and the innermost diameter portion 903 of the rotor 311 is Φb, the following relationship is established: [Mathematical formula 6] Furthermore, the thickness of the rotor core 311 in the radial direction of the rotating shaft is less than 10% of the outermost diameter portion 902 .

[0061] In addition, the structure is characterized in that, when the diameter 904 of the rotation holding inner cylinder portion 420 of the rotation holding body 400 is set to Φc, the following relationship is established: [Formula 7] Furthermore, the thickness of the rotor holder 400 in the radial direction of the rotation axis is less than or equal to 10% of the outermost diameter portion 902 of the rotor core 311 .

[0062] When the innermost diameter portion 803 of the rotor core 311 is corrected in the rotation axis direction relative to the rotation retaining body 400 in the case of large axial deviation when the rotor core 311 is fitted with the rotation retaining body 400, no bending moment is generated with the rotation axis radial V-shaped rivet 361 as a fulcrum.

[0063] The characteristic structure is that local stress is not easily generated in the outermost diameter portion 802 of the rotor core 311 and the thin-thickness portion of the permanent magnet 321 in the radial direction of the rotating shaft due to deviation of the rotating shaft radial V-shaped rivet 361 in the radial direction of the rotating shaft.

[0064] By using the rotating shaft radial V-shaped rivet 361, when the innermost diameter portion 903 of the rotor core 311 is corrected in the rotating shaft direction relative to the rotating retaining body 400 in the case of a large axial deviation when the rotor core 311 is fitted with the rotating retaining body 400, no bending moment with the rotating shaft radial V-shaped rivet 361 as a fulcrum is generated. The structure is characterized in that it is not easy to generate local stress in the outermost diameter portion 902 of the rotor core 3911 and the thin thickness portion of the permanent magnet 321 in the rotating shaft radial direction due to the deviation of the rotating shaft radial V-shaped rivet 361 in the rotating shaft radial direction.

[0065] In addition, without being limited to the structures of the above-mentioned embodiments, a structure having the function of suppressing the bending moment generated with the axial retaining body as a fulcrum when the rotor core is pressed in is adopted at the core body near the axial retaining body, thereby achieving the same effect. For example, it is also effective to provide an opening at the core body near the axial retaining body or near the inner diameter of the core, and to arrange the opening at an appropriate position that can suppress the above-mentioned bending moment. It is particularly preferable to arrange the opening at the core body near the inner diameter of the core at each position where the axial retaining body overlaps in the circumferential direction.

[0066] In addition, in each embodiment, regarding the permanent magnet 321 constituting the magnetic pole of the rotor, a structure in which a flat-plate-shaped magnet is arranged when observed in cross section is exemplified. However, in the case of a structure in which the thickness of the rotor core is thinned in the radial direction, it can also be arranged in a configuration in which a pair of flat-plate-shaped magnets are arranged in parallel straight lines along the circumferential direction to constitute each magnetic pole, and it can also be arranged in a structure in which a pair of flat-plate-shaped magnets are arranged in a V-shape inclined relative to the circumferential direction. The basic effects of the present application described in each embodiment can also be obtained.

[0067] 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 application to specific embodiments, but may also be applied to the embodiments alone or in various combinations. Therefore, it is considered that numerous modifications not shown in the examples are also included in the technical scope disclosed in the specification of this application, including, for example, the case where at least one component is modified, added, or omitted, and the case where at least one component is extracted and combined with components of other embodiments. Industrial Applicability

[0068] The present application is applicable to realizing a rotating electric machine capable of reducing stress concentration at a thin-walled portion of a rotor core. Explanation of symbols

[0069] 100 rotating motor; 210 housing; 211 frame; 212 end plate; 220 armature; 221 coil; 222 terminal block; 223 armature core; 224 spiral tube; 300 rotor; 311 rotor core; 321 permanent magnet; 331 axial retaining body; 340 core body fitting part; 351 recess; 361 rotating shaft radial V-shaped rivet; 370 round riveted core; 371 round rivet; 400 rotating retaining body; 401 knurled part; 402 crimping part; 410 rotating retaining outer cylinder; 420 rotating retaining inner cylinder; 440 rotating retaining fitting part; 500 bearing.

Claims

1. A rotating electrical machine, comprising: stator; as well as A rotor, the rotor and the stator are arranged with a magnetic gap portion interposed therebetween, the rotor comprising a rotor core and a plurality of permanent magnets, the rotor core being stacked with electromagnetic steel sheets, the plurality of permanent magnets being arranged on the rotor core at equal intervals in a circumferential direction, It is characterized in that The rotating motor is provided with an axial retaining body, a rotating retaining body and a suppression structure. The axial retaining body is arranged on the radial inner side of the permanent magnet with a number half the number of magnetic poles of the rotor. The rotating retaining body is configured in a cylindrical shape, and the rotor core is arranged in the outer cylinder. The suppression structure suppresses the bending moment with the axial retaining body as the fulcrum.

2. The rotating electrical machine according to claim 1, characterized in that The axial retaining bodies are arranged at equal intervals with a number that is half the number of magnetic poles of the rotor.

3. The rotating electrical machine according to claim 1, characterized in that The restraining structure is composed of a recessed portion formed on the inner peripheral portion of the rotor core at the position of the axial retaining body.

4. The rotating electrical machine according to claim 1, wherein: The suppression structure is constituted by a recessed portion formed in an outer cylindrical portion of the rotation holding body.

5. The rotating electrical machine according to claim 1, characterized in that The axial retaining body is configured to be in a V-riveted shape.

6. The rotating electrical machine according to claim 1, characterized in that The axial retaining body is configured as a circular riveted shape.

7. The rotating electrical machine according to any one of claims 1 to 6, characterized in that The thickness of the rotor core in the radial direction is less than 10% of the outermost peripheral diameter of the rotor core.

8. The rotating electrical machine according to any one of claims 1 to 6, characterized in that The thickness of the outer cylindrical portion of the rotation retaining body in the radial direction from the rotor core is 10% or less of the outermost peripheral diameter of the rotor core.

9. The rotating electrical machine according to claim 3 or 4, characterized in that: The recessed portion has a shape in which the angle in the circumferential direction of the recessed portion is greater than or equal to 360° / the number of poles.

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