Rotor core structure and motor with same

Abstract

The utility model discloses a rotor core structure and a motor with the same, and the rotor core structure comprises a rotating shaft, a rotor punching sheet assembly, and an anti-loosening assembly. Wherein the rotor punching sheet assembly is provided with a through shaft hole, the rotating shaft penetrates through the shaft hole, a fit clearance is formed between the rotating shaft and the shaft hole, the outer surface of the rotating shaft is provided with a plurality of first key grooves extending in the axial direction of the rotating shaft, and the inner surface of the shaft hole is provided with a plurality of second key grooves which are in one-to-one correspondence with the first key grooves and extend in the axial direction of the rotating shaft; the anti-loosening assembly comprises a plurality of wedge-shaped components, each wedge-shaped component at least comprises two wedge-shaped blocks, the wedge-shaped components are tightly wedged in the first key grooves and the second key grooves through the wedge-shaped blocks in the radial direction of the rotating shaft, and the wedge-shaped components are tightly wedged in the first key grooves and the second key grooves through the wedge-shaped blocks in the circumferential direction of the rotating shaft. The rotor core structure solves the problem that the rotor core is easy to deviate from the rotating shaft due to the fact that the rotor core adopts a single wedge and a flat key mode.

Description

Technical Field

[0001] This utility model relates to the field of rotor technology, and more specifically, to a rotor core structure and a motor having the same. Background Technology

[0002] Currently, to improve the installation efficiency of rotor laminations, large-clearance fits are used between the rotor laminations and the outer circle of the shaft ribs in large motor rotor cores. This is achieved by using wedges within the clearance for radial tensioning and ordinary flat keys for circumferential tensioning to transmit motor torque. However, relying solely on a single wedge for radial tensioning, a single-point anti-loosening method, easily leads to centroidal shift in the rotor core. When using flat keys for circumferential tensioning and torque transmission, assembly clearances exist, resulting in transmission lag. During motor startup or reversal, the key working surface is prone to localized overload. Furthermore, the lack of synchronicity in the key-keyway transition fit makes the rotor core susceptible to detachment from the shaft upon impact. Utility Model Content

[0003] The main objective of this invention is to provide a rotor core structure and a motor having the same, so as to at least solve the problem that the rotor core is prone to centroid shift and rotor core detachment from the shaft when using a single wedge and flat key.

[0004] According to one aspect of the present invention, a rotor core structure is provided, comprising:

[0005] Shaft;

[0006] A rotor lamination assembly, wherein the rotor lamination assembly has a through shaft hole, the shaft passes through the shaft hole and has a fitting clearance between the shaft hole and the shaft hole, the outer surface of the shaft is provided with a plurality of first keyways extending along the axial direction of the shaft, and the inner surface of the shaft hole is provided with a plurality of second keyways corresponding one-to-one with the plurality of first keyways and extending along the axial direction of the shaft.

[0007] An anti-loosening component includes multiple wedge-shaped parts, each wedge-shaped part including at least two wedge-shaped blocks. Along the radial direction of the rotating shaft, the wedge-shaped parts are wedged into the first keyway and the second keyway by the wedge-shaped blocks. Along the circumferential direction of the rotating shaft, the wedge-shaped parts are wedged into the first keyway and the second keyway by the wedge-shaped blocks.

[0008] Furthermore, the wedge-shaped component includes a first wedge-shaped component, which includes a first wedge block and a second wedge block. The first wedge block is at least partially disposed in the first keyway, and the second wedge block is at least partially disposed in the second keyway. The first wedge block has a first inclined surface on the side away from the rotating shaft, and the second wedge block has a second inclined surface on the side close to the rotating shaft. The first wedge block and the second wedge block are wedged together by the first inclined surface and the second inclined surface.

[0009] Furthermore, the thickness between the first inclined surface of the first wedge and the side opposite to the first inclined surface gradually decreases along the first direction, and the thickness between the second inclined surface of the second wedge and the side opposite to the second inclined surface gradually increases along the first direction.

[0010] Furthermore, the wedge-shaped component further includes a second wedge-shaped component, which includes a third wedge block, a fourth wedge block, and a fifth wedge block. The third wedge block is at least partially disposed in the first keyway, the fourth wedge block is at least partially disposed in the second keyway, and the fifth wedge block is at least partially disposed in both the first and second keyways. The third wedge block has a third inclined surface on its side away from the rotating shaft, and the fourth wedge block has a fourth inclined surface on its side near the rotating shaft. The third wedge block and the fourth wedge block are connected by the third inclined surface and the fourth inclined surface. Wedging; the fifth wedge block is wedged with the third wedge block and the fourth wedge block respectively. The third wedge block has a fifth inclined surface on the side near the fifth wedge block. The fourth wedge block has a sixth inclined surface parallel to the fifth inclined surface on the side near the fifth wedge block. The fifth wedge block has a seventh inclined surface on the side near the third and fourth wedge blocks. The third wedge block is wedged with the fifth wedge block through the fifth inclined surface and the seventh inclined surface. The fourth wedge block is wedged with the fifth wedge block through the sixth inclined surface and the seventh inclined surface.

[0011] Furthermore, the thickness between the third inclined surface of the third wedge block and the side opposite to the third inclined surface gradually decreases along the first direction; the thickness between the fourth inclined surface of the fourth wedge block and the side opposite to the fourth inclined surface gradually increases along the first direction; the thickness between the fifth inclined surface of the third wedge block and the side opposite to the fifth inclined surface gradually increases along the first direction; the thickness between the sixth inclined surface of the fourth wedge block and the side opposite to the sixth inclined surface gradually increases along the first direction; and the thickness between the seventh inclined surface of the fifth wedge block and the side opposite to the seventh inclined surface gradually decreases along the first direction.

[0012] Furthermore, the thickness of the third wedge block along the radial direction of the axis of rotation is greater than the maximum thickness of the first wedge block along the radial direction of the axis of rotation.

[0013] Furthermore, the thickness of the third wedge block along the radial direction of the rotating shaft is less than the sum of the thicknesses of the first wedge block and the second wedge block along the radial direction of the rotating shaft, and there is a predetermined gap between the third wedge block and the second keyway along the radial direction of the rotating shaft.

[0014] Furthermore, a plurality of first keyways are equidistantly disposed on the outer surface of the rotating shaft along its circumference, and a plurality of first keyways are disposed through the outer surface of the rotating shaft along its axial direction; and / or,

[0015] A plurality of second keyways are equidistantly arranged on the inner surface of the shaft hole along the circumferential direction of the rotating shaft, and a plurality of second keyways are through-hole arranged on the inner surface of the shaft hole along the axial direction of the rotating shaft.

[0016] Furthermore, the plurality of second keyways include at least one marking slot, the marking slot being provided with a positioning portion, and the rotor lamination assembly includes a plurality of rotor laminations stacked and positioned by means of the positioning portion.

[0017] On the other hand, the present invention also provides an electric motor, which includes the rotor core structure described above.

[0018] In this invention, the anti-loosening component consists of multiple wedge-shaped parts, each containing at least two wedge blocks. Along the radial and circumferential directions of the shaft, the wedge blocks are wedged tightly between the first and second keyways, forming multi-point support and fastening. This not only effectively avoids the drawbacks of single-point anti-loosening but also greatly enhances the stability of the rotor core on the shaft, significantly reducing the risk of center of gravity shift and ensuring the smooth operation of the motor. The wedge-shaped parts wedged tightly into the first and second keyways along the circumferential direction of the shaft, effectively reducing the fitting clearance and making torque transmission more efficient and direct. The wedge blocks work together to evenly distribute the torque, avoiding local overload and improving the overall performance and reliability of the motor. The wedge-shaped parts of the rotor core structure, in conjunction with the keyways, significantly improve synchronization through the radial and circumferential wedging action of the wedge blocks. When the motor is subjected to impact, the tight fit between the wedge blocks and the keyways effectively prevents the rotor core from separating from the shaft, overcoming the lack of synchronization in traditional flat key transition fits, greatly enhancing the reliability of the connection between the rotor core and the shaft, and extending the service life of the motor. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the rotor core structure disclosed in an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of the rotor core structure disclosed in this embodiment of the present invention along the radial direction of the rotating shaft (when the first wedge-shaped component and the second wedge-shaped component are combined);

[0022] Figure 3 This is a cross-sectional view of the rotor core structure in the prior art disclosed in this utility model embodiment along the radial direction of the rotating shaft (when the first wedge-shaped component is combined with the flat key);

[0023] Figure 4 for Figure 2 An enlarged schematic diagram of Ⅰ in the diagram;

[0024] Figure 5 for Figure 2 Enlarged schematic diagram of II in the diagram;

[0025] Figure 6 for Figure 3 Enlarged schematic diagram of Ⅲ in the diagram;

[0026] Figure 7 for Figure 3 Enlarged schematic diagram of IV in the diagram;

[0027] Figure 8 This is the main idea of ​​the first wedge-shaped component disclosed in this utility model;

[0028] Figure 9 This is a side view of the first wedge-shaped component disclosed in this utility model;

[0029] Figure 10 This is a top view of the first wedge-shaped component disclosed in this utility model;

[0030] Figure 11 This is a front view of the second wedge-shaped component disclosed in this utility model;

[0031] Figure 12 This is a side view of the second wedge-shaped component disclosed in this utility model;

[0032] Figure 13 This is a top view of the second wedge-shaped component disclosed in this utility model;

[0033] Figure 14 This is a cross-sectional view along the radial direction of the rotor lamination assembly with three second wedge-shaped components disclosed in this utility model.

[0034] Figure 15 This is a cross-sectional view along the rotor axis radially of the rotor core structure with three second wedge-shaped components disclosed in this utility model.

[0035] Figure 16 This is a cross-sectional view along the radial direction of the rotor lamination assembly with six second wedge-shaped components disclosed in this utility model.

[0036] Figure 17 This is a cross-sectional view along the rotor axis radially of the rotor core structure with six second wedge-shaped components disclosed in this utility model.

[0037] Figure 18 This is a schematic diagram of the structure of the motor with a rotor core disclosed in this utility model.

[0038] The above figures include the following reference numerals:

[0039] 10. Rotating shaft; 11. Rib; 111. First keyway; 20. Rotor lamination assembly; 21. Shaft hole; 211. Second keyway; 2111. Marking groove; 2112. Positioning part; 30. Anti-loosening assembly; 31. First wedge component; 311. First wedge block; 3111. First inclined surface; 312. Second wedge block; 3121. Second inclined surface; 32. Second wedge component; 321. Third wedge block; 3211. Third inclined surface; 3212. Fifth inclined surface; 322. Fourth wedge block; 3221. Fourth inclined surface; 3222. Sixth inclined surface; 323. Fifth wedge block; 3231. Seventh inclined surface; 3232. Predetermined gap; 33. Circumferential gap; 40. Flat key; 50. Motor; 51. Rotor core structure; 52. Stator structure. Detailed Implementation

[0040] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] See Figures 1 to 17 As shown, according to an embodiment of this application, a rotor core structure is provided, including a rotor shaft 10, a rotor lamination assembly 20, and an anti-loosening component 30. The rotor lamination assembly 20 has a through-hole 21, the rotor shaft 10 passes through the axial hole 21 and has a fitting clearance with the axial hole 21, the outer surface of the rotor shaft 10 is provided with a plurality of first keyways 111 extending axially along the shaft, and the inner surface of the axial hole 21 is provided with a plurality of second keyways 211 corresponding one-to-one with the plurality of first keyways 111 and extending axially along the shaft 10; the anti-loosening component 30 includes a plurality of wedge-shaped components, each wedge-shaped component including at least two wedge blocks. Along the radial direction of the rotor shaft 10, the wedge-shaped components are wedge-fitted to the first keyways 111 and the second keyways 211 by the wedge blocks; along the circumferential direction of the rotor shaft 10, the wedge-shaped components are wedge-fitted to the first keyways 111 and the second keyways 211 by the wedge blocks.

[0044] In this embodiment, the rotating shaft 10 also includes a radial rib 11. When the rotating shaft 10 is assembled in the shaft hole 21 of the rotor lamination assembly 20, there is a fitting gap between the radial rib 11 and the shaft hole 21, which makes it easy to install the rotor lamination assembly 20 on the rotating shaft 10 (that is, to insert the rotating shaft 10 into the shaft hole 21 of the rotor lamination assembly 20). The first keyway 111 is provided on the radial rib 11. The wedge-shaped component of the anti-loosening assembly 30 is wedged into the first keyway 111 and the second keyway 211 by at least two wedge blocks along the radial direction (perpendicular to the direction of the rotating shaft 10). Since the second keyway 211 is located in the shaft hole 21 of the rotor lamination assembly 20, the wedge-shaped component can abut against the rotating shaft 10 and the rotor lamination assembly 20 respectively in the radial direction of the rotating shaft 10, and perform radial anti-loosening on the rotating shaft 10 and the rotor lamination assembly 20 to prevent the rotating shaft 10 and the rotor lamination assembly 20 from loosening during the high-speed rotation of the rotor core structure. By providing multiple first keyways 111 and multiple second keyways 211 corresponding to the first keyways 111, radial anti-loosening can be achieved at multiple positions in the circumferential direction of the rotating shaft 10, avoiding the gap concentration caused by the clearance fit between the rotating shaft 10 and the rotor lamination assembly 20, which would cause the center of mass of the rotor core structure to deviate and increase the imbalance during dynamic balancing. The wedge-shaped component is also wedged into the first keyway 111 and the second keyway 211 by at least two wedge-shaped blocks along the circumference of the rotating shaft 10 (or the tangential direction when the rotating shaft rotates). When the rotor core structure rotates at high speed, it can transmit torque between the radial ribs 11 and the rotor lamination assembly 20, so that the rotor lamination assembly 20 and the rotating shaft 10 can rotate synchronously.

[0045] Specifically, the wedge-shaped component includes a first wedge-shaped component 31, which includes a first wedge block 311 and a second wedge block 312. The first wedge block 311 is at least partially disposed in the first keyway 111, and the second wedge block 312 is at least partially disposed in the second keyway 211. The first wedge block 311 has a first inclined surface 3111 on the side away from the rotating shaft 10, and the second wedge block 312 has a second inclined surface 3121 on the side close to the rotating shaft 10. The first wedge block 311 and the second wedge block 312 are wedged together by the first inclined surface 3111 and the second inclined surface 3121.

[0046] refer to Figure 5As shown, along the circumferential direction of the rotating shaft 10, there is a circumferential gap 33 between the first wedge-shaped component 31 and the first keyway 111 and the second keyway 211. Through the circumferential gap 33, when the first wedge block 311 of the first wedge-shaped component 31 is inserted into the first keyway 111, it can avoid the large friction caused by the interference fit between the first wedge block 311 and the first keyway 111, making it difficult to insert the first wedge block 311 into the first keyway 111. When the second wedge block 312 of the first wedge-shaped component 31 is inserted into the second keyway 211 to cooperate with the first wedge block 311, it can avoid the large friction caused by the interference fit between the second wedge block 312 and the second keyway 211, making it difficult to insert into the second keyway 211. This improves the convenience and efficiency of assembling the first wedge block 311 and the second wedge block 312. When the first wedge-shaped component 31 is inserted between the first keyway 111 and the second keyway 211, the resistance generated by friction and interference in the circumferential direction can be eliminated, allowing the first wedge-shaped component 31 to slide and wedge together better in the radial direction.

[0047] The first wedge-shaped component 31 is wedged together with the first inclined surface 3111 of the first wedge block 312 and the second inclined surface 3121 of the second wedge block 312, which can wed the rotating shaft 10 tightly in the shaft hole of the rotor lamination assembly 20 in the radial direction. The first wedge block 311 and the second wedge block 312 are pressed against each other by the inclined surfaces, generating a clamping force in the radial direction of the rotating shaft. When the rotor core structure rotates at high speed, the friction between the first wedge block 311 and the second wedge block 312 will be further increased due to the centrifugal force and torque, forming a dynamic self-locking, preventing the rotating shaft 10 from loosening in the radial direction between the rotating shaft 10 and the rotor lamination assembly 20. When the rotor core structure operates at high speed, the temperature will rise, and the rotating shaft 10 and the rotor lamination assembly 20 will expand unevenly due to material differences. The elastic deformation capacity of the first wedge block 311 and the second wedge block 312 of the first wedge-shaped component 31 can partially absorb thermal stress and prevent connection failure. The first inclined surface 3111 and the second inclined surface 3121 have the same inclination, which is determined according to the wedge tightening amount and the length of the wedge block.

[0048] refer to Figure 9 As shown, the thickness between the first inclined surface 3111 of the first wedge block 311 and the side away from the first inclined surface 3111 gradually decreases along the first direction X, and the thickness between the second inclined surface 3121 of the second wedge block 312 and the side away from the second inclined surface 3121 gradually increases along the first direction X.

[0049] Specifically, the wedge-shaped component also includes a second wedge-shaped component 32, which includes a third wedge block 321, a fourth wedge block 322, and a fifth wedge block 323. The third wedge block 321 is at least partially disposed in the first keyway 111, the fourth wedge block 322 is at least partially disposed in the second keyway 211, and the fifth wedge block 323 is at least partially disposed in the first keyway 111 and the second keyway 211. The third wedge block 321 has a third inclined surface 3211 on the side away from the rotating shaft 10, and the fourth wedge block 322 has a fourth inclined surface 3221 on the side close to the rotating shaft 10. The third wedge block 321 and the fourth wedge block 322 are wedged together by the third inclined surface 3211 and the fourth inclined surface 3221. The fifth wedge block 323 is wedged into the third wedge block 321 and the fourth wedge block 322 respectively. The third wedge block 321 has a fifth inclined surface 3212 on the side near the fifth wedge block 323. The fourth wedge block 322 has a sixth inclined surface 3222 parallel to the fifth inclined surface 3212 on the side near the fifth wedge block 323. The fifth wedge block 323 has a seventh inclined surface 3231 on the side near the third wedge block 321 and the fourth wedge block 322. The third wedge block 321 and the fifth wedge block 323 are wedged into each other through the fifth inclined surface 3212 and the seventh inclined surface 3231. The fourth wedge block 322 and the fifth wedge block 323 are wedged into each other through the sixth inclined surface 3222 and the seventh inclined surface 3231.

[0050] The third wedge block 321 of the second wedge component 32 is at least partially disposed in the first keyway 111 of the rotating shaft 10, and the fourth wedge block 322 is at least partially disposed in the second keyway 211 of the rotor lamination assembly 20. The third wedge block 321 is wedged into the fourth inclined surface 3221 of the fourth wedge block 322 through the third inclined surface 3211, thereby generating an axial clamping force on the rotating shaft 10. The fifth wedge block 323 is wedged into the fifth inclined surface 3212 of the third wedge block 321 and the fifth inclined surface 3212 of the fourth wedge block 322 through the seventh inclined surface 3231, thereby generating a radial expansion force on the rotating shaft 10, so that the rotating shaft 10 and the rotor lamination assembly 20 are uniformly fitted in the circumferential direction. The second wedge component 32 can simultaneously achieve radial and circumferential anti-loosening between the rotating shaft 10 and the rotor lamination assembly 20, thereby avoiding local failure caused by overload in one direction.

[0051] refer to Figure 3In the prior art, the same first wedge-shaped component 31 as in this embodiment is used to prevent radial loosening between the rotating shaft 10 and the rotor lamination assembly 20. A flat key 40 is used for circumferential clamping to transmit torque. There is a radial gap between the flat key 40 and the rotating shaft 10 or the rotor lamination assembly 20 to facilitate the insertion of the flat key 40 into the keyway between the rotating shaft 10 and the rotor lamination assembly 20. Therefore, radial loosening is only achieved at a single point. Due to the radial gap of the flat key 40, the fit clearance between the rotating shaft 10 and the rotor lamination assembly 20 will shift. Figure 3 , Figure 6 and Figure 7 As shown, the clearance of the first wedge-shaped component 31 is relatively large, while the clearance of the flat key 40 is relatively small. During startup or reversal, the low connection stiffness between the rotor shaft 10 and the rotor lamination assembly 20 poses a significant risk, potentially leading to motor damage. Existing technology uses the flat key 40 for circumferential tensioning and torque transmission. However, the small contact area between the rotor lamination assembly 20 and the radial ribs 11 of the rotor shaft 10 in a large-mass rotor core structure makes it prone to center-of-gravity shift, generating a huge load. This can cause fatigue in the flat key 40 when transmitting the electromagnetic torque of the motor, potentially leading to circumferential crushing of the working surface, resulting in severe motor vibration and affecting its service life. The flat key 40 and keyway primarily use a transition fit to improve assembly performance, but this lacks synchronicity in torque transmission. The electromagnetic torque from the rotor core to the shaft may lag due to the assembly clearance. During rotor startup, the flat key 40 and keyway are not fully synchronized, leading to localized overload of the flat key. The working surface of the flat key 40 is susceptible to crushing, deformation, and failure. In this embodiment, the second wedge component 32 can achieve radial tension through the wedging of the third wedge block 321 and the fourth wedge block 322, and can also achieve circumferential tension through the wedging of the fifth wedge block 323 with the third wedge block 321 and the fourth wedge block 322. Furthermore, by combining the first wedge component 31 or the second wedge component 32 in multiple keyways, multi-point radial tension can be achieved, which can prevent the rotor center of gravity from shifting and the problem of misalignment of the fitting clearance between the shaft 10 and the rotor lamination assembly 20.

[0052] Furthermore, the thickness between the third inclined surface 3211 of the third wedge block 321 and the side away from the third inclined surface 3211 gradually decreases along the first direction X; the thickness between the fourth inclined surface 3221 of the fourth wedge block 322 and the side away from the fourth inclined surface 3221 gradually increases along the first direction X; the thickness between the fifth inclined surface 3212 of the third wedge block 321 and the side away from the fifth inclined surface 3212 gradually increases along the first direction X; the thickness between the sixth inclined surface 3222 of the fourth wedge block 322 and the side away from the sixth inclined surface 3222 gradually increases along the first direction X; and the thickness between the seventh inclined surface 3231 of the fifth wedge block 323 and the side away from the seventh inclined surface 3231 gradually decreases along the first direction X.

[0053] Specifically, when the third wedge block 321 is inserted into the space between the first keyway 111 and the second keyway 211 along the X direction, the contact area between the third inclined surface 3211 and the first keyway 111 gradually increases, forming an axially increasing compressive stress to resist the axial movement of the rotor. When the sixth inclined surface 3222 of the fourth wedge block 322 and the seventh inclined surface 3231 of the fifth wedge block 323 cooperate, the movement along the X direction forces the fifth wedge block 323 to expand radially outward, which is converted into radial clamping force, enhancing the circumferential fit between the shaft 10 and the rotor lamination assembly 20. The fourth inclined surface 3221 of the fourth wedge block 322 and the third inclined surface 3211 of the third wedge block 321 form complementary inclined surfaces. When pressed in along the X direction, the sliding of the inclined surfaces between the two generates a superposition effect of axial compressive force, and the preload amplification factor can reach 1.5 to 2 times compared with other equal thickness designs. The thickness between the sixth inclined surface 3222 of the fourth wedge block 322 and the side opposite to the fifth inclined surface 3212 increases along the X direction. When it weds into the seventh inclined surface 3231 of the fifth wedge block 323, the fifth inclined surface 3212 pushes the fifth wedge block 323 to shift towards the second keyway 211 side, compensating for the assembly gap between the rotor lamination assembly 20 and the shaft 10. The wedging process converts the axial movement of the third wedge block 321 and the fourth wedge block 322 into radial expansion, while achieving balanced pressure distribution through the thickness gradient to avoid local overload.

[0054] Furthermore, the thickness of the fifth wedge block 323 along the radial direction of the rotating shaft 10 is greater than the maximum thickness of the third wedge block along the radial direction of the rotating shaft. This allows the seventh inclined surface 3231 of the fifth wedge block 323 to wedge with the fifth inclined surface 3212 of the third wedge block 321, and also with the sixth inclined surface 3222 of the fourth wedge block 322. This avoids the problem that the fifth wedge block 323 cannot wedge with the fourth wedge block 322 due to its insufficient radial thickness along the rotating shaft 10, and prevents the fourth wedge block 322 from failing between the first keyway 111 and the second keyway 211. It also improves the wedging force among the third wedge block 321, the fourth wedge block 322, and the fifth wedge block 323, ensuring both circumferential wedging of the rotating shaft 10 and the rotor lamination assembly 20, and radial wedging of the rotating shaft 10 and the rotor lamination assembly 20.

[0055] Furthermore, the thickness of the fifth wedge 323 along the radial direction of the rotation axis 10 is less than the sum of the thicknesses of the third wedge 321 and the fourth wedge 322 along the radial direction of the rotation axis 10, and a predetermined gap 3232 exists between the fifth wedge 323 and the second keyway 211 along the radial direction of the rotation axis 10. (Reference) Figure 11 The thickness of the fifth wedge block 323 along the radial direction of the shaft 10 differs from the sum of the thicknesses of the third wedge block 321 and the fourth wedge block 322 along the radial direction of the shaft 10 by Δh. This eliminates the possibility of interference friction in the radial direction of the shaft 10 due to the assembly gap when the fifth wedge block 323 is installed, ensuring that the fifth wedge block 323 can be better wedged in the circumferential direction of the shaft 10. This reduces the labor intensity and installation time of the fifth wedge block 323, and ensures the assembly quality and reliability of the rotor core. Eliminating the resistance generated by the mutual interference friction between the fifth wedge block 323 and the bottom of the second keyway 211 facilitates the mutual wedging of the contact surfaces of the fifth wedge block 323 with the third wedge block 321 and the fourth wedge block 322, thereby achieving circumferential wedging of the rotor lamination assembly and the radial rib 11, transmitting the electromagnetic torque of the motor to the shaft 10, and finally to the load, driving the load to operate.

[0056] In this embodiment, the inclinations between the first inclined surface 3111 and the second inclined surface 3121, the third inclined surface 3211 and the fourth inclined surface 3221, the fifth inclined surface 3212 and the seventh inclined surface 3231, and the sixth inclined surface 3222 and the seventh inclined surface 3231 are designed primarily based on the wedge tightening amount and the length of the inclined surfaces, with specific design specifications tailored to the actual factory conditions. Compared to other surfaces on each wedge block, the first inclined surface 3111, the second inclined surface 3121, the third inclined surface 3211, the fourth inclined surface 3221, the fifth inclined surface 3212, the sixth inclined surface 3222, and the seventh inclined surface 3231 have higher smoothness, which improves the relative sliding between contact surfaces during tightening, reduces labor intensity and assembly time, and avoids repeated installation.

[0057] Furthermore, multiple first keyways 111 are equidistantly arranged on the outer surface of the rotating shaft 10 along its circumference, and multiple first keyways 111 are through-hole arranged on the outer surface of the rotating shaft 10 along its axial direction; multiple second keyways 211 are equidistantly arranged on the inner surface of the shaft hole 21 along its circumference, and multiple second keyways 211 are through-hole arranged on the inner surface of the shaft hole 21 along its axial direction. By equidistantly arranging multiple first keyways 111 on the outer surface of the rotating shaft 10 and through-hole arranged along its axial direction, and by arranging multiple second keyways 211 corresponding to the first keyways 111 on the inner surface of the shaft hole 21, multiple wedging points can be achieved in the circumferential direction of the rotating shaft 10, preventing the fitting clearance between the rotating shaft 10 and the rotor lamination assembly 20 from concentrating in one position, improving the overall uniformity of the rotor core structure, preventing the center of mass of the rotor core structure from shifting, and improving the dynamic balance and vibration performance of the rotor core.

[0058] Furthermore, the plurality of second keyways 211 include at least one marking slot 2111, the marking slot 2111 being provided with a positioning part 2112. The rotor lamination assembly 20 includes a plurality of rotor laminations stacked and positioned by the positioning part 2112. The positioning part 2112 provides a precise positioning reference for the stacking of the rotor laminations, making the assembly process simpler and faster. During assembly, the rotor laminations can be stacked together quickly and accurately according to the positioning part 2112 of the marking slot 2111, reducing assembly time and labor costs and improving production efficiency. Ensuring the assembly accuracy of the rotor lamination assembly 20 helps to improve the overall quality and performance of the rotor and reduce problems such as uneven magnetic field and decreased motor performance caused by rotor lamination position deviations.

[0059] Preferably, at both ends of the rotating shaft 10 along the axial direction, the rotating shaft 10 and the rotor lamination assembly 20 are fixedly connected together by several weld seams. That is, the radial ribs 11 at both ends of the rotor lamination assembly 20 and the rotating shaft 10 along the axial direction are welded together, which improves the connection strength and rigidity between the rotating shaft 10 and the rotor lamination assembly 20, which helps to reduce rotor deflection and increase the critical speed of the rotor, thereby greatly improving the dynamic stability, quality, and vibration performance of the rotor. The weld seams can transmit a portion of the electromagnetic torque, eliminating the unique dependence on the second wedge-shaped component 32 to transmit electromagnetic torque, and eliminating concerns about the insufficient ability of the second wedge-shaped component 32 to transmit electromagnetic torque alone. The weld seams can provide an insurance for the second wedge-shaped component 32 to transmit electromagnetic torque, ensuring the safety of the second wedge-shaped component 32. At both ends of the rotating shaft 10 along the axial direction, the two ends of the first wedge-shaped component 31 or the two ends of the second wedge-shaped component 32 are fixed to the contact surfaces of the rotating shaft 10 and the rotor lamination assembly 20 by spot welding, respectively, to prevent loosening along the circumferential direction of the rotating shaft 10.

[0060] Optionally, refer to Figure 14 and Figure 15 As shown, this embodiment can also employ, as follows: Figure 14 and Figure 15 The structure of the three second wedge-shaped components 32 shown is as follows: Figure 14 This is a schematic diagram of the rotor lamination assembly 20. Its shaft hole 21 has three second keyways 211 evenly distributed circumferentially along the shaft 10. These keyways cooperate with three second wedge-shaped components 32, achieving three circumferential and three radial wedging points between the shaft 10 and the rotor lamination assembly 20. Each second wedge-shaped component 32 simultaneously achieves circumferential and radial wedging. One of the second keyways 211 is a marking groove 2111 with a positioning part 2112, improving the rotor core structure's ability to transmit torque circumferentially and the radial tension, thus enhancing the anti-loosening capability of the rotor lamination assembly 20 and the shaft 10. This allows for better adaptation to harsher operating conditions with higher power, more frequent starts, and reverse rotation, thereby ensuring the motor rotor's output power and robust stability, and improving the motor's mechanical performance.

[0061] Optionally, refer to Figure 16 and Figure 17 As shown, this embodiment can also employ, as follows: Figure 16 and Figure 17 The structure of the six second wedge-shaped components 32 shown is as follows: Figure 16 The rotor lamination assembly 20 has six second keyways 211 in its shaft hole 21, one of which is a marking groove 2111 with a positioning part 2112. This achieves six axial wedging and six radial wedging between the shaft 10 and the rotor lamination assembly 20, increasing the circumferential torque transmission capacity by 6 times and the radial tension by 6 times. There is no centroid eccentricity after the rotor core is tensioned, thereby improving the anti-loosening capability of the rotor core drive, improving the rotor output torque capacity and dynamic stability, and improving the mechanical performance of the rotor.

[0062] Optionally, the wedge-tightening component in this embodiment can also be a combination of three second wedge-shaped components 32 and three first wedge-shaped components 31, or a combination of four second wedge-shaped components 32 and two first wedge-shaped components 31, or a combination of two second wedge-shaped components 32 and four first wedge-shaped components 31. The number of first wedge-shaped components 31 and the number of second wedge-shaped components 32 are mainly based on the torque that the rotor needs to transmit and the size of the fit clearance formed by the rotor lamination hole diameter (rotor shaft rib diameter). The larger the diameter (hole diameter) of both, the larger the fit clearance formed, and the more radially tightening first wedge-shaped components 31 are needed. It is also necessary to match the motor power. The greater the power, the more composite key second wedge-shaped components 32 that need to transmit torque are required. The number of both is configured according to actual needs.

[0063] In this embodiment, when installing the first wedge component 31 or the second wedge component 32, the first keyway 111 on the rotating shaft 10, i.e., the second keyway 211 on the rotor lamination assembly 20, is first locally heated. The first wedge block 311 and the second wedge block 312, or the third wedge block 321 and the fourth wedge block 322, are then inserted into the corresponding keyways. After inserting the third wedge block 321 and the fourth wedge block 322, the fifth wedge block 323 is then inserted. Local heating of the keyway utilizes the thermal expansion and contraction characteristics of the material. During heating, the keyway expands, making it easier to insert the corresponding wedge block. Furthermore, as the keyway cools and contracts, it further tightens the composite key, resulting in a tighter fit between the wedge component and the keyway, thus improving the connection's strength.

[0064] On the other hand, this application also discloses an electric motor, with reference to Figure 18 As shown, the motor includes the aforementioned rotor core structure 51 and stator structure 52, which are assembled on the motor 50. Therefore, the motor 50 includes all the technical effects of the aforementioned rotor core structure 51. Since the technical effects of the rotor core structure 51 have been described in detail above, they will not be repeated here.

[0065] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0066] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0067] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor core structure, characterized in that, include: Rotating shaft (10); The rotor lamination assembly (20) has a through shaft hole (21), the rotating shaft (10) passes through the shaft hole (21) and has a fitting clearance with the shaft hole (21), the outer surface of the rotating shaft (10) is provided with a plurality of first keyways (111) extending along the axial direction of the rotating shaft (10), and the inner surface of the shaft hole (21) is provided with a plurality of second keyways (211) corresponding one-to-one with the plurality of first keyways (111) and extending along the axial direction of the rotating shaft (10). The anti-loosening component (30) includes a plurality of wedge-shaped components, each wedge-shaped component including at least two wedge-shaped blocks. Along the radial direction of the rotating shaft (10), the wedge-shaped components are wedge-fitted to the first keyway (111) and the second keyway (211) by means of the wedge-shaped blocks. Along the circumferential direction of the rotating shaft (10), the wedge-shaped components are wedge-fitted to the first keyway (111) and the second keyway (211) by means of the wedge-shaped blocks.

2. The rotor core structure according to claim 1, characterized in that, The wedge-shaped component includes a first wedge-shaped component (31), which includes a first wedge block (311) and a second wedge block (312). The first wedge block (311) is at least partially disposed in the first keyway (111), and the second wedge block (312) is at least partially disposed in the second keyway (211). The first wedge block (311) has a first inclined surface (3111) on the side away from the rotating shaft (10), and the second wedge block (312) has a second inclined surface (3121) on the side close to the rotating shaft (10). The first wedge block (311) and the second wedge block (312) are wedged together by the first inclined surface (3111) and the second inclined surface (3121).

3. The rotor core structure according to claim 2, characterized in that, The thickness between the first inclined surface (3111) of the first wedge (311) and the side away from the first inclined surface (3111) gradually decreases along the first direction, and the thickness between the second inclined surface (3121) of the second wedge (312) and the side away from the second inclined surface (3121) gradually increases along the first direction.

4. The rotor core structure according to claim 2, characterized in that, The wedge-shaped component further includes a second wedge-shaped component (32), which includes a third wedge block (321), a fourth wedge block (322), and a fifth wedge block (323). The third wedge block (321) is at least partially disposed in the first keyway (111), the fourth wedge block (322) is at least partially disposed in the second keyway (211), and the fifth wedge block (323) is at least partially disposed in both the first keyway (111) and the second keyway (211). The third wedge block (321) has a third inclined surface (3211) on the side away from the rotating shaft (10), and the fourth wedge block (322) has a fourth inclined surface (3221) on the side closer to the rotating shaft (10). The third wedge block (321) and the fourth wedge block (322) are wedged together by the third inclined surface (3211) and the fourth inclined surface (3221). The fifth wedge (323) is wedged into the third wedge (321) and the fourth wedge (322) respectively. The third wedge (321) has a fifth inclined surface (3212) on the side near the fifth wedge (323), and the fourth wedge (322) has a sixth inclined surface (3222) parallel to the fifth inclined surface (3212) on the side near the fifth wedge (323). 3) A seventh inclined surface (3231) is provided on one side near the third wedge block (321) and the fourth wedge block (322). The third wedge block and the fifth wedge block (323) are wedged together by the fifth inclined surface (3212) and the seventh inclined surface (3231). The fourth wedge block (322) and the fifth wedge block (323) are wedged together by the sixth inclined surface (3222) and the seventh inclined surface (3231).

5. The rotor core structure according to claim 4, characterized in that, The thickness of the third inclined surface (3211) of the third wedge (321) and the side away from the third inclined surface (3211) gradually decreases along the first direction; the thickness of the fourth inclined surface (3221) of the fourth wedge (322) and the side away from the fourth inclined surface (3221) gradually increases along the first direction; the thickness of the fifth inclined surface (3212) of the third wedge (321) and the side away from the fifth inclined surface (3212) gradually increases along the first direction; the thickness of the sixth inclined surface (3222) of the fourth wedge (322) and the side away from the sixth inclined surface (3222) gradually increases along the first direction; and the thickness of the seventh inclined surface (3231) of the fifth wedge (323) and the side away from the seventh inclined surface (3231) gradually decreases along the first direction.

6. The rotor core structure according to claim 4, characterized in that, The thickness of the third wedge (321) along the radial direction of the pivot (10) is greater than the maximum thickness of the first wedge (311) along the radial direction of the pivot (10).

7. The rotor core structure according to claim 4, characterized in that, The thickness of the third wedge (321) along the radial direction of the pivot (10) is less than the sum of the thicknesses of the first wedge (311) and the second wedge (312) along the radial direction of the pivot (10), and there is a predetermined gap (3232) between the third wedge (321) and the second keyway (211) along the radial direction of the pivot (10).

8. The rotor core structure according to any one of claims 1 to 3, characterized in that, A plurality of first keyways (111) are equidistantly disposed on the outer surface of the rotating shaft (10) along the circumferential direction, and a plurality of first keyways (111) are disposed through the outer surface of the rotating shaft (10) along the axial direction; and / or, A plurality of second keyways (211) are equidistantly disposed on the inner surface of the shaft hole (21) along the circumferential direction of the shaft (10), and a plurality of second keyways (211) are disposed through the inner surface of the shaft hole (21) along the axial direction of the shaft (10).

9. The rotor core structure according to any one of claims 1 to 3, characterized in that, The plurality of second keyways (211) include at least one marking slot (2111) provided with a positioning part (2112), and the rotor lamination assembly (20) includes a plurality of rotor laminations stacked and positioned by the positioning part (2112).

10. An electric motor, characterized in that, The motor includes the rotor core structure as described in any one of claims 1 to 9.

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