Rotor core axial clamping assembly, rotor and motor

Abstract

The present invention provides a rotor core axial clamping assembly, a rotor and an electric motor. The rotor core axial clamping assembly includes two clamping elements arranged in pairs, each clamping element includes a circular sleeve and a pressing ring extending radially outward from one end of the circular sleeve along the circular sleeve, each circular sleeve is used to be fitted and fixed on the rotor shaft, and the two pressing rings are used to press against the end faces at both axial ends of the rotor core respectively. When in use, it is only necessary to fit and fix the circular sleeve of each clamping element on the rotor shaft, so that the rotor core is clamped between the pressing rings of the two clamping elements, and the two pressing rings are used to press and tighten against the end faces at both axial ends of the rotor core respectively, so that elastic force can be generated in the axial direction to ensure a simple and reliable clamping effect on the rotor core, and sufficient tolerance can be provided in the axial direction of the rotor shaft for the dimensional error caused by the rotor production process, the deformation and creep generated during operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive equipment, and in particular, relates to a rotor core axial clamping assembly, a rotor and a motor. Background Art

[0002] The rotor of the electric motor includes a rotor shaft and a rotor core fixed on the rotor shaft. The rotor core is generally a core lamination group formed by stacking steel sheets along the axial direction of the rotor shaft. At present, the core lamination group is prone to loosening during the operation of the rotor without axial compression. Therefore, it is usually necessary to additionally configure bolts and nuts, and pass the bolts through the steel sheets of the core lamination group in sequence along the axial direction of the rotor shaft, and then lock them with nuts to provide axial compression force to the core lamination group. Since the bolts need to penetrate the rotor core (core lamination group), not only is the assembly cumbersome, time-consuming and labor-intensive, and has a negative impact on electromagnetic flow, but also the dimensional accuracy requirements of the parts are high, resulting in the consistency of the compression and positioning of the core lamination group being difficult to ensure, resulting in a large dimensional deviation of the core lamination group, resulting in a large dynamic imbalance of the rotor. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a rotor core axial clamping assembly that can axially clamp the rotor core, reduce the difficulty of installing the rotor core, ensure the consistency of the compression and positioning of the core lamination group, and reduce the dynamic imbalance of the rotor.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a rotor core axial clamping assembly for axially clamping the rotor core of the rotor, including two clamping elements arranged in pairs, each clamping element including a circular sleeve and a pressure ring extending radially outward from one end of the circular sleeve along the circular sleeve, each of the circular sleeves is used to be fitted and fixed on the rotor shaft of the rotor, and the two pressure rings are used to respectively press on the end faces of the axial ends of the rotor core, so that the two pressure rings clamp the rotor core along the axial direction of the rotor shaft.

[0005] Furthermore, the pressure ring is an annular pressure plate, and a plurality of through holes are provided on the annular pressure plate near the edge of the outer circumferential surface of the annular pressure plate, and the through holes are used to insert cylindrical rods or tension pins to achieve material addition compensation for the dynamic balance of the rotor.

[0006] Furthermore, the plurality of through holes are arranged at equal intervals along the circumference of the annular pressure plate.

[0007] Further, the circular sleeve is located on a side of the pressure ring facing the rotor core; or, the circular sleeve is located on a side of the pressure ring facing away from the rotor core.

[0008] Furthermore, a first balancing ring is sleeved on the outer side of the pressure ring.

[0009] Furthermore, the circular sleeve is located on a side of the pressure ring away from the rotor core, and a second balancing ring is sleeved on an outer circumferential surface of the circular sleeve.

[0010] Furthermore, two second balancing rings are sleeved on the outer circumferential surface of the circular sleeve, and the two second balancing rings are stacked along the axial direction of the circular sleeve.

[0011] Furthermore, the second balance ring is a low-magnetic-permeability part or a non-magnetic-permeability part made of a non-metallic material that does not refract or reflect electromagnetic waves.

[0012] Another object of an embodiment of the present invention is to provide a rotor with a rotor core axial clamping assembly, which reduces the difficulty of installing the rotor core, ensures the consistency of the compression and positioning of the core lamination group, and reduces the dynamic imbalance of the rotor.

[0013] To achieve the above object, the technical solution adopted by the present invention is: to provide an electric motor, including a rotor shaft, a rotor core assembled on the rotor shaft, and a rotor core axial clamping assembly for axially clamping the rotor core.

[0014] Another object of an embodiment of the present invention is to provide an electric motor with an axial clamping assembly for a rotor core, so as to reduce the difficulty of installing the rotor core, ensure the consistency of the compaction and positioning of the core lamination group, and reduce the dynamic imbalance of the rotor.

[0015] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide an electric motor, including the rotor core axial clamping assembly or the rotor.

[0016] Compared with the prior art, the one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0017] The rotor core axial clamping assembly, rotor and motor in the embodiment of the present invention, when the rotor core axial clamping assembly is used, it is only necessary to put the circular sleeves of each clamping element together and fix them on the rotor shaft, so that the rotor core is clamped between the pressing rings of the two clamping elements, and the two pressing rings are used to press and clamp the end faces of the rotor core at both ends of the axial direction, so that elastic force can be generated in the axial direction to ensure a simple and reliable clamping effect on the rotor core, which can provide sufficient tolerance in the axial direction of the rotor shaft for the dimensional error caused by the rotor production process, the deformation and creep generated during operation, and provide reliable fastening force to resist radial, tangential and axial displacement. In this way, the difficulty of installing the rotor core is reduced, the consistency of the pressing and positioning of the core lamination group is ensured, and the dynamic imbalance of the rotor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of the rotor core axial clamping assembly provided in the first embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the three-dimensional structure of a rotor provided in Embodiment 1 of the present invention;

[0021] Figure 3 An exploded view of a rotor provided in Embodiment 1 of the present invention;

[0022] Figure 4 A schematic diagram of the side structure of a rotor provided in Embodiment 1 of the present invention;

[0023] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA line;

[0024] Figure 6 A schematic diagram of the three-dimensional structure of a clamping element provided in the second embodiment of the present invention;

[0025] Figure 7 A schematic cross-sectional structural diagram of a rotor provided in Embodiment 2 of the present invention;

[0026] Figure 8 A schematic diagram of the three-dimensional structure of a clamping element provided in Embodiment 3 of the present invention;

[0027] Fig. 9 A schematic cross-sectional view of a rotor provided in Embodiment 3 of the present invention;

[0028] Fig.10 A schematic diagram of the three-dimensional structure of a clamping element provided in Embodiment 4 of the present invention;

[0029] Fig.11 A schematic cross-sectional structural diagram of a rotor provided in Embodiment 4 of the present invention;

[0030] Fig.12 A schematic diagram of the three-dimensional structure of a clamping element provided in Embodiment 5 of the present invention;

[0031] Fig.13 A schematic cross-sectional structural diagram of a rotor provided in Embodiment 5 of the present invention;

[0032] Fig.14 A schematic diagram of the three-dimensional structure of a clamping element provided in Embodiment 6 of the present invention;

[0033] Fig.15 This is a schematic diagram of the cross-sectional structure of the rotor provided in Example 6 of the present invention.

[0034] Among them, the reference numerals in the figure are:

[0035] 1-clamping element; 11-circular sleeve; 12-pressing ring; 121-through hole; 122-bayonet;

[0036] 2- rotor; 21- rotor shaft; 22- rotor core;

[0037] 3-the first balance ring; 4-the second balance ring. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0042] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0043] Please also read Figures 1 to 15 The rotor core axial clamping assembly provided by the embodiment of the present invention is now described. After being assembled on the rotor shaft 21 of the rotor 2, the rotor core axial clamping assembly provided by the embodiment of the present invention can exert an axial force on the radially outer area of ​​the rotor core 22 of the rotor 2, that is, the rotor core axial clamping assembly can be used to axially clamp the rotor core 22 to resist the fan-shaped spread of the rotor core 22. Please refer to Figures 1 to 3 The rotor core axial clamping assembly includes two clamping elements 1 arranged in pairs, each clamping element 1 includes a circular sleeve 11 and a pressing ring 12 extending radially outward from one end of the circular sleeve 11 along the circular sleeve 11, each circular sleeve 11 is used to be mounted on and fixed on the rotor shaft 21 of the rotor 2, and the two pressing rings 12 are used to press on the end surfaces of the axial ends of the rotor core 22 respectively, so that the two pressing rings 12 clamp the rotor core 22 along the axial direction of the rotor shaft 21. When in use, it is only necessary to fit the circular sleeve 11 of each clamping element 1 and fix it on the rotor shaft 21, so that the rotor core 22 is clamped between the pressing rings 12 of the two clamping elements 1, and the two pressing rings 12 are respectively pressed and pressed against the end faces of the rotor core 22 at both axial ends, so that the two pressing rings 12 clamp the rotor core 22 along the axial direction of the rotor shaft 21, and then generate elastic force in the axial direction to ensure a simple and reliable clamping effect on the rotor core 22, which can provide sufficient tolerance in the axial direction of the rotor shaft 21 for the dimensional error caused by the production process of the rotor 2, the deformation and creep generated during operation, and can provide reliable fastening force to resist radial, tangential and axial displacement.

[0044] Compared with the prior art, the rotor core axial clamping assembly provided by the embodiment of the present invention only needs to fit and fix the circular sleeve 11 of each clamping element 1 on the rotor shaft 21, so that the rotor core 22 is clamped between the pressing rings 12 of the two clamping elements 1. The two pressing rings 12 are used to press and tighten the end faces of the rotor core 22 at both axial ends, so that elastic force can be generated in the axial direction to ensure a simple and reliable clamping effect on the rotor core 22, and sufficient tolerance can be provided in the axial direction of the rotor shaft 21 for the dimensional error caused by the production process of the rotor 2, the deformation and creep generated during operation, and reliable fastening force can be provided to resist radial, tangential and axial displacement. In this way, the difficulty of installing the rotor core 22 is reduced, the consistency of the pressing and positioning of the core lamination group is ensured, and the dynamic imbalance of the rotor 2 is reduced.

[0045] Please refer to Figure 1 , Figure 3 and Figure 6 In some embodiments, the pressing ring 12 is an annular pressure plate, and a plurality of through holes 121 are provided on the annular pressure plate near the edge of the outer circumference of the annular pressure plate, and the through holes 121 are used to insert cylindrical rods or tension pins to achieve the purpose of material-added compensation for the dynamic balance of the rotor 2. In this embodiment, by adopting the above scheme, a plurality of through holes 121 are provided on the annular pressure plate, and the plurality of through holes 121 are arranged near the edge of the outer circumference of the annular pressure plate, and cylindrical rods or tension pins can be placed in the through holes 121 to achieve the purpose of material-added compensation for dynamic balance, and further reduce the dynamic imbalance of the rotor 2.

[0046] Please refer to Figure 1 , Figure 3 and Figure 6 In some embodiments, a plurality of through holes 121 are arranged at equal intervals along the circumference of the annular pressure plate. In this embodiment, by adopting the above scheme, a plurality of through holes 121 are arranged at equal intervals along the circumference of the annular pressure plate, and cylindrical rods or tension pins can be placed in the corresponding through holes 121 according to actual needs to achieve the purpose of material-additive compensation dynamic balance.

[0047] Please refer to Figure 1 , Figure 8 and Fig.12 In some embodiments, the circular sleeve 11 is located on the side of the pressing ring 12 facing the rotor core 22, that is, the inner diameter formed flange for providing axial support and centering the shaft faces the rotor core 22, and the axial force is transmitted to the rotor shaft 21 through the flange (circular sleeve 11) formed on the inner diameter through friction connection. Figure 6 and Fig.10In some other embodiments, the circular sleeve 11 is located on the side of the pressure ring 12 away from the rotor core 22, and the inner diameter molded flange for providing axial support and centering the shaft is opposite to the rotor core 22. Through the flange (circular sleeve 11) molded on the inner diameter, the axial force is transmitted to the rotor shaft 21 through friction connection.

[0048] Please refer to Figure 8 , Fig. 9 and Fig.10 In some embodiments, the outer side of the pressure ring 12 is provided with a first balance ring 3. In this embodiment, by adopting the above scheme, the outer side of the pressure ring 12 is provided with a first balance ring 3, and the first balance ring 3 can be reduced by milling or drilling to achieve the purpose of dynamic balance. It can be understood that the first balance ring 3 is a low-magnetic or non-magnetic part made of non-metallic material that does not refract or reflect electromagnetic waves, so as to reduce the magnetic conductivity and electrical conductivity of the first balance ring 3 to avoid negative effects on electromagnetic flow. It can be understood that, please refer to Figure 8 and Fig.10 In some embodiments, the pressure ring 12 is provided with a bayonet 122 for snapping and fixing the first balance ring 3. The first balance ring 3 can be conveniently and quickly installed and fixed to the outside of the pressure ring 12 by simply snapping the first balance ring 3 into the bayonet 122.

[0049] Please refer to Fig.12 and Fig.13 In some embodiments, the circular sleeve 11 is located on the side of the pressing ring 12 away from the rotor core 22, and the second balancing ring 4 is mounted on the outer circumference of the circular sleeve 11. In this embodiment, by adopting the above solution, the second balancing ring 4 is mounted on the outer circumference of the circular sleeve 11 (inner diameter flange), and the second balancing ring 4 has a reserved (definable) balancing difference, so that the dynamic balancing difference of the rotor 2 can be quickly compensated by rotating the first balancing ring 3 and the second balancing ring 4 in a targeted manner.

[0050] Please refer to Fig.14 and Fig.15 In some embodiments, two second balancing rings 4 are mounted on the outer circumference of the circular sleeve 11, and the two second balancing rings 4 are stacked along the axial direction of the circular sleeve 11. In this embodiment, by adopting the above scheme, two second balancing rings 4 are mounted on the outer circumference of the circular sleeve 11, that is, two second balancing rings 4 are pressed on the inner diameter flange opposite to the rotor core 22, and the two second balancing rings 4 are respectively provided with a reserved (definable) balancing difference. By rotating the two second balancing rings 4 in a targeted manner, the dynamic balancing difference of the rotor 2 can be quickly compensated.

[0051] In some embodiments, the second balance ring 4 is a low-magnetic or non-magnetic component made of a non-metallic material that does not refract or reflect electromagnetic waves. In this embodiment, by adopting the above solution, the second balance ring 4 is a low-magnetic or non-magnetic component made of a non-metallic material that does not refract or reflect electromagnetic waves, so as to reduce the magnetic permeability and conductivity of the second balance ring 4 and avoid negative impact on electromagnetic flow.

[0052] Please refer to Figure 2 , Figure 3 and Figure 5 In some embodiments, the present invention further provides a rotor 2, which includes a rotor shaft 21, a rotor core 22 mounted on the rotor shaft 21, and a rotor core axial clamping assembly for axially clamping the rotor core 22, and the rotor core axial clamping assembly is the rotor core axial clamping assembly provided by any of the above embodiments. Since the rotor 2 has all the technical features of the rotor core axial clamping assembly provided by any of the above embodiments, it has the effect of the rotor core axial clamping assembly provided by any of the above embodiments.

[0053] The embodiment of the present invention further provides an electric motor, which includes the rotor core axial clamping assembly or the rotor 2 provided in any of the above embodiments. Since the electric motor has all the technical features of the rotor core axial clamping assembly or the rotor 2 provided in any of the above embodiments, it has the effect of the rotor core axial clamping assembly or the rotor 2 provided in any of the above embodiments.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor core axial clamping assembly, used for axially clamping the rotor core of a rotor, characterized in that: The rotor core axial clamping assembly includes two clamping elements arranged in pairs, each clamping element includes a circular sleeve and a pressure ring extending radially outward from one end of the circular sleeve along the circular sleeve, each circular sleeve is used to be mounted on and fixed on the rotor shaft of the rotor, and the two pressure rings are used to respectively press on the end surfaces of the axial ends of the rotor core so that the two pressure rings clamp the rotor core along the axial direction of the rotor shaft; a first balancing ring is mounted on the outer side of the pressure ring, the circular sleeve is located on the side of the pressure ring away from the rotor core, and a second balancing ring is mounted on the outer circumferential surface of the circular sleeve.

2. The rotor core axial clamping assembly according to claim 1, characterized in that: The pressure ring is an annular pressure plate, and a plurality of through holes are provided on the edge of the annular pressure plate near the outer peripheral surface of the annular pressure plate. The through holes are used to insert cylindrical rods or tension pins to achieve material addition compensation for the dynamic balance of the rotor.

3. The rotor core axial clamping assembly according to claim 2, characterized in that: The plurality of through holes are arranged at equal intervals along the circumference of the annular pressure plate.

4. The rotor core axial clamping assembly according to claim 1, characterized in that: Two second balancing rings are sleeved on the outer circumferential surface of the circular sleeve, and the two second balancing rings are stacked along the axial direction of the circular sleeve.

5. The rotor core axial clamping assembly according to claim 1, characterized in that: The second balance ring is a low-magnetic-permeability part or a non-magnetic-permeability part made of a non-metallic material that does not refract or reflect electromagnetic waves.

6. A rotor, characterized in that: It comprises a rotor shaft, a rotor core mounted on the rotor shaft and a rotor core axial clamping assembly for axially clamping the rotor core, wherein the rotor core axial clamping assembly is the rotor core axial clamping assembly as claimed in any one of claims 1 to 5.

7. An electric motor, characterized in that: It comprises the rotor core axial clamping assembly according to any one of claims 1 to 5 or the rotor according to claim 6.

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