Rotor assembly and motor having the same

Abstract

The present invention provides a rotor assembly and a motor having the same. The rotor assembly comprises: a rotor core, a reinforcing groove is provided on the rotor core; a permanent magnet, a permanent magnet is provided in the reinforcing groove; a reinforcing member is provided in the reinforcing groove, and the reinforcing member is located on a side of the permanent magnet away from the middle of the rotor core; at least part of the reinforcing member is used to be attached to the permanent magnet. The technical solution provided by the present invention can solve the technical problem of easy fracture of the built-in rotor magnetic bridge in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of rotors, and in particular to a rotor assembly and a motor having the same. Background Art

[0002] At present, the rotor of a permanent magnet synchronous motor is mainly composed of a rotating shaft, a rotor core and permanent magnets. According to the placement of the permanent magnets, the rotor of a permanent magnet synchronous motor is specifically divided into two types: surface-mounted and built-in. Among them, since the permanent magnets of the built-in permanent magnet synchronous motor are inserted inside the rotor, there is no risk of the permanent magnets falling off.

[0003] However, the built-in rotor has a thinner magnetic bridge. The centrifugal force generated when the motor rotates at high speed will cause greater stress on the magnetic bridge, making the magnetic bridge at risk of breaking. The existing technology usually uses a special punching structure to increase the tensile stress of the rotor, or uses a support frame to support the rotor to share the stress on the rotor. However, both methods require mold opening. Since the mold is relatively complex, the mold opening cost is high, and too many frames or components will also cause the motor to generate additional vibration noise. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor assembly and a motor having the same, so as to solve the technical problem of easy breakage of the built-in rotor magnetic bridge in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a rotor assembly is provided, comprising:

[0006] A rotor core, wherein the rotor core is provided with a reinforcement groove;

[0007] A permanent magnet is arranged in the reinforcement groove;

[0008] The reinforcement piece is arranged in the reinforcement groove, and is located on a side of the permanent magnet away from the middle of the rotor core; at least a part of the reinforcement piece is used to be arranged in contact with the permanent magnet.

[0009] Furthermore, there are a plurality of reinforcement grooves, which are arranged at intervals along the circumferential direction of the rotor core; and a permanent magnet and a reinforcement member are arranged in each reinforcement groove.

[0010] Furthermore, there are multiple permanent magnets, which are spaced apart along the circumferential direction of the rotor core to form a permanent magnet group, and at least one permanent magnet in the permanent magnet group is arranged in the reinforcement slot and attached to the reinforcement member located in the reinforcement slot;

[0011] There are multiple permanent magnet groups, and the multiple permanent magnet groups are arranged at intervals along the circumferential direction of the rotor core.

[0012] Further, the permanent magnet located in the middle of the permanent magnet group is installed in the reinforcement groove and is attached to the reinforcement member in the reinforcement groove; and / or,

[0013] The permanent magnet with the largest cross-sectional area among the plurality of permanent magnets is installed in the reinforcement groove and is arranged in contact with the reinforcement member in the reinforcement groove.

[0014] Furthermore, the rotor assembly further comprises:

[0015] The first baffle assembly and the second baffle assembly are respectively arranged on both sides of the rotor core, and the permanent magnet and the reinforcement are both located between the first baffle assembly and the second baffle assembly to limit the permanent magnet and the reinforcement.

[0016] Furthermore, the rotor assembly further comprises:

[0017] The baffle assembly is provided with a fixing groove for fixing the end of the reinforcement member, and the fixing groove is arranged opposite to at least a part of the reinforcement groove.

[0018] Furthermore, a flow port connected to the fixing groove is provided on the baffle assembly, and at least a portion of the end of the reinforcement is spaced from the fixing groove to form a flow channel; the rotor assembly also includes:

[0019] A flow guide member, wherein the flow guide member cover is arranged at the flow opening and protrudes from the flow opening;

[0020] Wherein, a flow guide opening is provided on the flow guide member, and the extending direction of the flow guide opening is the same as the rotation direction of the rotor core.

[0021] Furthermore, the guide member comprises a first panel, a side panel assembly and a second panel which are connected in sequence, and the first panel and the second panel are arranged opposite to each other and spaced apart;

[0022] The side panel assembly includes a first side panel and a second side panel connected to each other, the drainage opening is arranged on the first side panel, the second side panel is an arc-shaped panel, and the first side panel and the second side panel are connected at a preset angle.

[0023] Further, the baffle assembly includes an outer baffle and an inner baffle connected to each other; the outer baffle is located on a side of the inner baffle away from the rotor core; the fixing groove is arranged on the inner baffle; the reinforcement member includes a first reinforcement portion and a second reinforcement portion connected to each other, the first reinforcement portion is used to be arranged in contact with the permanent magnet, and the second reinforcement portion is arranged at a distance from the permanent magnet to form a first flow channel; the end of the second reinforcement portion is arranged at a distance from the groove wall of the fixing groove to form a second flow channel connected to the first flow channel;

[0024] The outer baffle is provided with a flow port for introducing gas, and the flow port is connected with the second flow channel; the flow port is arranged opposite to the fixing groove, and at least part of the edge of the flow port protrudes from the edge of the fixing groove.

[0025] Further, the reinforcement member is a plate-like structure, and two sides of the plate-like structure are respectively used to fit with the permanent magnet and the slot wall of the reinforcement slot; or,

[0026] The reinforcement member comprises a first reinforcement part and a second reinforcement part which are connected to each other. The first reinforcement part is used to be arranged in contact with the permanent magnet, and the second reinforcement part is arranged at a distance from the permanent magnet.

[0027] Furthermore, the reinforcement member includes a first reinforcement portion and a second reinforcement portion connected to each other, the first reinforcement portion is used to be arranged in contact with the permanent magnet, and the second reinforcement portion is arranged at a distance from the permanent magnet;

[0028] There are two first reinforcement parts, and the two first reinforcement parts are respectively located on both sides of the second reinforcement part; and / or,

[0029] The reinforcement also includes a guide protrusion, which is arranged on the second reinforcement part and located on a side of the second reinforcement part close to the permanent magnet. The guide protrusion is extended along the extension direction of the reinforcement.

[0030] Further, the reinforcement groove includes a first reinforcement groove and a second reinforcement groove connected to each other, the first reinforcement groove is used to accommodate the permanent magnet and is configured to match the permanent magnet; the second reinforcement groove is used to accommodate the reinforcement member and is configured to match the reinforcement member;

[0031] Wherein, 1 / 2≤D / d≤3 / 4, D is the width of the second reinforcement slot along the circumferential direction of the rotor core, and d is the width of the permanent magnet along the circumferential direction of the rotor core; and / or,

[0032] 1 / 3≤H / h≤1 / 2, H is the thickness of the second reinforcement slot along the radial direction of the rotor core, and h is the thickness of the permanent magnet along the radial direction of the rotor core; and / or,

[0033] The reinforcement is made of a highly magnetically permeable material.

[0034] According to another aspect of the present invention, there is provided a motor, comprising: the rotor assembly provided above.

[0035] By applying the technical solution of the present invention, it is possible to set a reinforcement member so that the outward extrusion force generated by the permanent magnet under the centrifugal force generated by the high-speed rotation of the rotor assembly can act on the reinforcement member, thereby avoiding the permanent magnet from directly extruding the rotor core, and further avoiding the deformation of the rotor core. In this way, when the rotor assembly rotates at a high speed, the reinforcement member supports the rotor core, thereby reducing the stress on the rotor core, and further effectively improving the overall strength of the rotor assembly. Therefore, the technical problem of easy fracture of the built-in rotor magnetic bridge in the prior art can be solved through the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 A schematic diagram of the structural decomposition of a rotor assembly provided according to the first embodiment of the present invention is shown;

[0038] Figure 2 It shows a schematic structural diagram of a rotor assembly provided according to the first embodiment of the present invention;

[0039] Figure 3 A cross-sectional view of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0040] Figure 4 A front view of an outer baffle of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0041] Figure 5 A top view of a flow guide member of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0042] Figure 6 A front view of an inner baffle of a rotor assembly provided according to the first embodiment of the present invention is shown;

[0043] Figure 7 A front view of a rotor core of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0044] Figure 8 A schematic structural diagram of a permanent magnet of a rotor assembly provided in Embodiment 1 of the present invention is shown;

[0045] Fig. 9 A schematic structural diagram of a reinforcement member of a rotor assembly provided according to Embodiment 1 of the present invention is shown;

[0046] Fig.10 A bottom view of a reinforcement member of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0047] Fig.11 A front view of a reinforcement member of a rotor assembly provided according to a first embodiment of the present invention is shown;

[0048] Fig.12 A schematic structural diagram of a reinforcement member of a rotor assembly provided according to a second embodiment of the present invention is shown.

[0049] The above drawings include the following reference numerals:

[0050] 10. rotor core; 11. reinforcement slot; 111. first reinforcement slot; 112. second reinforcement slot; 12. permanent magnet slot;

[0051] 20. Permanent magnet; 21. First magnetic steel; 22. Second magnetic steel;

[0052] 30. reinforcement member; 31. first reinforcement portion; 32. second reinforcement portion; 33. flow guide protrusion;

[0053] 40. Permanent magnet group;

[0054] 50, baffle assembly; 51, first baffle assembly; 52, second baffle assembly; 53, outer baffle; 531, flow port; 54, inner baffle; 541, fixing groove;

[0055] 60. Guide member; 61. First panel; 621. First side panel; 622. Second side panel; 63. Second panel. DETAILED DESCRIPTION

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] like Figures 1 to 11 As shown, the first embodiment of the present invention provides a rotor assembly, which includes a rotor core 10, a permanent magnet 20 and a reinforcement member 30. The rotor core 10 is provided with a reinforcement slot 11. The permanent magnet 20 is arranged in the reinforcement slot 11. The reinforcement member 30 is arranged in the reinforcement slot 11, and the reinforcement member 30 is located on a side of the permanent magnet 20 away from the middle of the rotor core 10; at least a part of the reinforcement member 30 is used to be arranged in contact with the permanent magnet 20.

[0058] By using the rotor assembly provided in the first embodiment of the present invention, the reinforcement member 30 can be provided so that the outward extrusion force generated by the permanent magnet 20 under the centrifugal force generated by the high-speed rotation of the rotor assembly can act on the reinforcement member 30, thereby avoiding the permanent magnet 20 from directly extruding the rotor core 10, and further avoiding the deformation of the rotor core 10. In this way, when the rotor assembly rotates at a high speed, the reinforcement member 30 supports the rotor core 10, thereby reducing the stress on the rotor core 10, and further effectively improving the overall strength of the rotor assembly. Therefore, the rotor assembly provided in this embodiment can solve the technical problem of easy fracture of the built-in rotor magnetic bridge in the prior art.

[0059] Specifically, the rotor core 10 is formed by stacking a plurality of rotor punchings. With such a structural arrangement, since the present embodiment reduces the stress on the rotor punchings by providing the reinforcement member 30, the manufacture of the rotor punchings does not require special mold opening, thereby effectively reducing the production cost of the rotor assembly.

[0060] Specifically, in order to facilitate the arrangement of the reinforcement member 30 , the reinforcement member 30 is arranged in a one-to-one correspondence with the reinforcement groove 11 .

[0061] Specifically, “the reinforcement member 30 is located at a side of the permanent magnet 20 away from the middle of the rotor core 10 ” means that the reinforcement member 30 is located at a portion of the rotor core 10 close to the outer edge thereof.

[0062] Specifically, there are a plurality of reinforcement slots 11, and the plurality of reinforcement slots 11 are arranged at intervals along the circumferential direction of the rotor core 10. A permanent magnet 20 and a reinforcement member 30 are arranged in each reinforcement slot 11. With such a structural arrangement, the support and protection of various locations in the circumferential direction of the rotor core 10 can be improved through the arrangement of the plurality of reinforcement slots 11 and the arrangement of the reinforcement member 30, thereby further improving the overall structural strength of the rotor assembly.

[0063] Specifically, there are multiple permanent magnets 20, and multiple permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10 to form a permanent magnet group 40, and at least one permanent magnet 20 in the permanent magnet group 40 is arranged in the reinforcement slot 11 and is attached to the reinforcement member 30 located in the reinforcement slot 11. Among them, there are multiple permanent magnet groups 40, and multiple permanent magnet groups 40 are arranged at intervals along the circumferential direction of the rotor core 10. With such a structural arrangement, the electromagnetic performance of the rotor assembly can be improved by arranging multiple permanent magnets 20 and multiple permanent magnet groups 40. At the same time, by making at least one permanent magnet 20 in the permanent magnet group 40 be arranged in the reinforcement slot 11 and attached to the reinforcement member 30 located in the reinforcement slot 11, the position of the rotor magnetic bridge can be better protected and the possibility of rotor punching fracture can be reduced.

[0064] Specifically, the permanent magnet 20 in the middle of the permanent magnet group 40 is installed in the reinforcement slot 11 and is arranged in contact with the reinforcement member 30 in the reinforcement slot 11. With such a structural arrangement, the weak position of the rotor magnetic bridge can be better protected, and the possibility of rotor punching fracture can be further reduced.

[0065] Specifically, the one with the largest cross-sectional area among the plurality of permanent magnets 20 is installed in the reinforcement slot 11 and is arranged in contact with the reinforcement member 30 in the reinforcement slot 11. With such a structural arrangement, the one with the largest cross-sectional area among the plurality of permanent magnets 20 can cooperate with the reinforcement member 30 to better protect the weak position of the rotor magnetic bridge, and further reduce the possibility of the rotor punching breaking.

[0066] Specifically, “one of the plurality of permanent magnets 20 having the largest cross-sectional area” refers to one of the permanent magnets 20 having the largest cross-sectional area along the circumferential direction of the rotor core 10 .

[0067] Specifically, in order to facilitate the insertion of the permanent magnet 20 in the rotor core 10, the rotor core 10 is further provided with a permanent magnet slot 12, and the permanent magnet 20 is arranged in the permanent magnet slot 12. Specifically, there are multiple permanent magnet slots 12, and the multiple permanent magnet slots 12 are arranged at intervals along the circumferential direction of the rotor core 10. The number of permanent magnets 20 is equal to the sum of the number of permanent magnet slots 12 and the number of reinforcement slots 11.

[0068] Specifically, the permanent magnet group 40 includes a first magnetic steel 21 and two second magnetic steels 22, and the two second magnetic steels 22 are respectively located on both sides of the first magnetic steel 21. The first magnetic steel 21 is used to be inserted in the reinforcement slot 11, and the second magnetic steel 22 is used to be inserted in the permanent magnet slot 12. Among them, the cross-sectional area of ​​the first magnetic steel 21 along the circumferential direction of the rotor core 10 is greater than the cross-sectional area of ​​the second magnetic steel 22 along the circumferential direction of the rotor core 10. With such a structural setting, when the rotor assembly rotates at a high speed, the part of the rotor core 10 that is subjected to the greatest force is the part corresponding to the first magnetic steel 21. Such a setting can more specifically improve the structural strength of the rotor assembly through the reinforcement member 30 in the reinforcement slot 11, which helps to improve the setting efficiency of the reinforcement member 30.

[0069] In this embodiment, the rotor assembly further includes a first baffle assembly 51 and a second baffle assembly 52, which are respectively arranged on both sides of the rotor core 10, and the permanent magnet 20 and the reinforcement 30 are both located between the first baffle assembly 51 and the second baffle assembly 52, so as to limit the position of the permanent magnet 20 and the reinforcement 30. With such a structural arrangement, the positions of the permanent magnet 20, the reinforcement 30 and the rotor core 10 can be fixed by the first baffle assembly 51 and the second baffle assembly 52, so as to ensure the integrity of the rotor assembly and prevent the falling off or separation of each structure.

[0070] Specifically, the rotor assembly further includes a baffle assembly 50, on which a fixing groove 541 for fixing the end of the reinforcement member 30 is provided, and the fixing groove 541 is arranged opposite to at least a portion of the reinforcement groove 11. With such a structural arrangement, the setting position of the reinforcement member 30 can be fixed by the fixing groove 541, so as to prevent the reinforcement member 30 from falling out of the rotor core 10, and further ensure the structural integrity of the rotor assembly.

[0071] Specifically, the baffle assembly 50 is provided with a flow opening 531 connected to the fixing groove 541, and at least part of the end of the reinforcement 30 is spaced from the fixing groove 541 to form a flow channel connected to the flow opening 531. The rotor assembly also includes a flow guide 60, which is covered on the flow opening 531 and protrudes from the flow opening 531. Among them, the flow guide 60 is provided with a drainage opening, and the extension direction of the drainage opening is the same as the rotation direction of the rotor core 10. With such a structural arrangement, the flow opening 531 and the flow channel can be set so that air can enter the rotor core 10 through the flow opening 531 and the flow channel, so that the rotor core 10 and the permanent magnet 20 and the reinforcement 30 set in the reinforcement groove 11 can be cooled and dissipated, thereby reducing the operating temperature of the rotor assembly during operation, thereby ensuring its working efficiency and extending the service life of the rotor assembly. In addition, the flow guide 60 and the flow opening thereon can better guide air into the flow opening 531, thereby further improving the efficiency of cooling and heat dissipation.

[0072] Specifically, the “extension direction of the drainage opening” refers to the direction from the connection between the guide member 60 and the baffle assembly 50 to the drainage opening. The “rotation direction of the rotor core 10 ” refers to the tangential direction of the periphery of the rotor core 10 .

[0073] Specifically, the air guide 60 has a first panel 61, a side panel assembly and a second panel 63 connected in sequence, and the first panel 61 and the second panel 63 are arranged oppositely and at intervals. Among them, the side panel assembly includes a first side panel 621 and a second side panel 622 connected to each other, the drainage opening is arranged on the first side panel 621, the second side panel 622 is an arc-shaped plate, and the first side panel 621 and the second side panel 622 are connected at a preset angle. With such a structural arrangement, air can be introduced into the rotor assembly through the drainage opening arranged on the first side panel 621, and at the same time, the air flow direction flowing in from the drainage opening is guided by the arrangement of the arc-shaped second side panel 622, so as to further improve the efficiency of diversion and heat dissipation.

[0074] In this embodiment, the baffle assembly 50 includes an outer baffle 53 and an inner baffle 54 connected to each other; the outer baffle 53 is located on the side of the inner baffle 54 away from the rotor core 10; the fixing groove 541 is arranged on the inner baffle 54; the reinforcement 30 includes a first reinforcement part 31 and a second reinforcement part 32 connected to each other, the first reinforcement part 31 is used to be arranged in contact with the permanent magnet 20, and the second reinforcement part 32 is arranged at intervals from the permanent magnet 20 to form a first circulation channel; the end of the second reinforcement part 32 is arranged at intervals from the groove wall of the fixing groove 541 to form a second circulation channel connected to the first circulation channel. The end of the second reinforcement part 32 forms at least part of the end of the reinforcement 30. Among them, a circulation port 531 for passing gas is arranged on the outer baffle 53, and the circulation port 531 is connected to the second circulation channel; the circulation port 531 is arranged opposite to the fixing groove 541, and at least part of the edge of the circulation port 531 protrudes from the edge of the fixing groove 541. With such a structural arrangement, the fixing effect of the end of the reinforcement member 30 can be enhanced by the outer baffle plate 53 and the inner baffle plate 54. At the same time, the arrangement of the first circulation channel and the second circulation channel can facilitate the air flowing in from the circulation port 531 to fully flow through the surface of the permanent magnet 20 to better cool the permanent magnet 20. In addition, the arrangement that at least part of the edge of the circulation port 531 protrudes from the edge of the fixing groove 541 can limit the part of the reinforcement member 30 extending into the fixing groove 541 through at least part of the edge of the circulation port 531, thereby preventing the reinforcement member 30 from moving along the axial direction of the rotor core 10, preventing the reinforcement member 30 from falling out, and improving the structural integrity of the rotor assembly.

[0075] Specifically, the reinforcement member 30 includes a first reinforcement portion 31 and a second reinforcement portion 32 connected to each other, the first reinforcement portion 31 is used to be arranged in contact with the permanent magnet 20, and the second reinforcement portion 32 is arranged at a distance from the permanent magnet 20. With such a structural arrangement, the first reinforcement portion 31 and the second reinforcement portion 32 can be arranged to ensure that the reinforcement member 30 is in contact with the permanent magnet 20 so that the reinforcement member 30 can withstand the thrust generated by the permanent magnet 20, and a distance is formed between the reinforcement member 30 and the permanent magnet 20, so that air can flow in to cool and dissipate the permanent magnet 20.

[0076] Specifically, in order to improve the structural strength of the reinforcement 30 and the stability of the contact between the reinforcement 30 and the permanent magnet 20, the reinforcement 30 includes a first reinforcement portion 31 and a second reinforcement portion 32 connected to each other, the first reinforcement portion 31 is used to be arranged in contact with the permanent magnet 20, and the second reinforcement portion 32 is arranged at a distance from the permanent magnet 20. There are two first reinforcement portions 31, and the two first reinforcement portions 31 are respectively located on both sides of the second reinforcement portion 32.

[0077] Specifically, the reinforcement member 30 includes a first reinforcement portion 31 and a second reinforcement portion 32 connected to each other, the first reinforcement portion 31 is used to be arranged in contact with the permanent magnet 20, and the second reinforcement portion 32 is arranged at a distance from the permanent magnet 20. The reinforcement member 30 also includes a guide protrusion 33, which is arranged on the second reinforcement portion 32 and is located on a side of the second reinforcement portion 32 close to the permanent magnet 20, and the guide protrusion 33 is extended along the extension direction of the reinforcement member 30. With such a structural arrangement, the flow direction of the air flowing through the surface of the permanent magnet 20 can be further improved by the arrangement of the guide protrusion 33, thereby further improving the cooling and heat dissipation efficiency of the permanent magnet 20.

[0078] Specifically, in order to better improve the flow guiding effect, there are multiple flow guiding protrusions 33 , and the multiple flow guiding protrusions 33 are arranged at intervals along the circumferential direction of the rotor core 10 .

[0079] In this embodiment, the reinforcement groove 11 includes a first reinforcement groove 111 and a second reinforcement groove 112 connected to each other. The first reinforcement groove 111 is used to accommodate the permanent magnet 20 and is configured to match the permanent magnet 20; the second reinforcement groove 112 is used to accommodate the reinforcement member 30 and is configured to match the reinforcement member 30. Among them, 1 / 2≤D / d≤3 / 4, D is the width of the second reinforcement groove 112 along the circumferential direction of the rotor core 10, and d is the width of the permanent magnet 20 along the circumferential direction of the rotor core 10. With such a structural setting, the support effect of the reinforcement member 30 on the permanent magnet 20 can be better guaranteed, and the electromagnetic performance of the rotor assembly can also be better guaranteed.

[0080] In this embodiment, the reinforcement groove 11 includes a first reinforcement groove 111 and a second reinforcement groove 112 connected to each other, the first reinforcement groove 111 is used to accommodate the permanent magnet 20 and is configured to match the permanent magnet 20; the second reinforcement groove 112 is used to accommodate the reinforcement member 30 and is configured to match the reinforcement member 30. Among them, 1 / 3≤H / h≤1 / 2, H is the thickness of the second reinforcement groove 112 along the radial direction of the rotor core 10, and h is the thickness of the permanent magnet 20 along the radial direction of the rotor core 10. With such a structural setting, the support effect of the reinforcement member 30 on the permanent magnet 20 can be better guaranteed, and the electromagnetic performance of the rotor assembly can also be better guaranteed.

[0081] Specifically, in order to ensure the electromagnetic performance of the rotor assembly, the reinforcement 30 is made of a high magnetic permeability material. Specifically, the reinforcement 30 is made of a material with bending resistance. Specifically, the reinforcement 30 is made of silicon steel. Specifically, the reinforcement 30 is made of GH4169 (precipitation-strengthened nickel-based high-temperature alloy) or 40CrNiMoA (alloy structural steel) or other steel materials.

[0082] like Fig.12As shown, in the second embodiment of the present invention, the reinforcement member 30 is a plate-like structure, and the two sides of the plate-like structure are respectively used to fit with the permanent magnet 20 and the slot wall of the reinforcement slot 11. With such a structural setting, the electromagnetic performance of the rotor assembly can be enhanced on the basis of improving the strength of the rotor assembly.

[0083] In the third embodiment of the present invention, a reinforcing member 30 is provided in the permanent magnet slot 12 for contacting with the permanent magnet 20 in the permanent magnet slot 12. With such a structural arrangement, the protection of the rotor core 10 can be further improved, thereby enhancing the structural strength of the rotor assembly and preventing the breakage of the rotor punching sheet.

[0084] In any one of the first, second and third embodiments, the assembly method of the rotor assembly includes: firstly, placing the outer baffle plate 53 at the bottom, placing the inner baffle plate 54 on the outer baffle plate 53, wherein the fixing groove 541 of the inner baffle plate 54 is aligned with the flow opening 531 on the outer baffle plate 53, and then stacking the rotor punchings to form the rotor core 10, placing it on the inner baffle plate 54, and the reinforcement groove 11 is aligned with the fixing groove 541; placing the outer baffle plate 53, the inner baffle plate 54 and the rotor core 10 together into a heating furnace and heating them to the required temperature for shrink-fitting, taking them out and fitting them on the rotating shaft; after complete cooling, inserting the reinforcement member 30 at the corresponding reinforcement groove 11, and then inserting the permanent magnet 20; finally, heating the inner baffle plate 54 and the outer baffle plate 53 to the required temperature for shrink-fitting, and fitting them on the rotor core 10, wherein the reinforcement member 30 needs to be inserted into the fixing groove 541, and the flow opening 531 needs to be aligned with the fixing groove 541, and the assembly of the entire rotor assembly is completed. Specifically, the rotor punching sheet and the rotating shaft are interference fit.

[0085] For Example 1, a strength simulation verification was carried out. The width of the reinforcement 30 used in the strength simulation verification along the circumferential direction of the rotor core 10 is half of the width of the first magnetic steel 21 along the circumferential direction of the rotor core 10, and the thickness of the reinforcement 30 along the radial direction of the rotor core 10 is one third of the thickness of the first magnetic steel 21 along the radial direction of the rotor core 10. The rotor speed used is 34,000 revolutions. The maximum yield strength of the rotor punching is 900 MPa. According to the verification results, when the reinforcement 30 is not used, the maximum equivalent stress on the rotor punching is 1151 MPa after the rotor speed reaches 34,000 revolutions, which exceeds the maximum yield strength of the rotor punching; when the reinforcement 30 is used, the maximum equivalent stress on the rotor punching is 858 MPa after the rotor speed reaches 34,000 revolutions, which is less than the maximum yield strength of the rotor punching. Compared with not using the reinforcement 30, the stress on the rotor punching is reduced by 25.5%.

[0086] A fourth embodiment of the present invention provides a motor, which includes the rotor assembly provided by any one of the first, second and third embodiments.

[0087] The motor provided by the fourth embodiment of the present invention can be provided with a reinforcement member 30 so that the outward extrusion force generated by the permanent magnet 20 under the centrifugal force generated by the high-speed rotation of the rotor assembly can act on the reinforcement member 30, thereby preventing the permanent magnet 20 from directly extruding the rotor core 10, thereby preventing the rotor core 10 from deforming. In this way, when the rotor assembly rotates at a high speed, the reinforcement member 30 supports the rotor core 10, thereby reducing the stress on the rotor core 10, thereby effectively improving the overall strength of the rotor assembly. Therefore, the motor provided by this embodiment can solve the technical problem of easy fracture of the built-in rotor magnetic bridge in the prior art.

[0088] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: when the motor rotates at high speed, the reinforcement member supports the rotor punching, thereby reducing the stress on the rotor punching, and greatly improving the strength of the rotor. The reinforcement member has a gas guide groove, and the rotor outer baffle has a flow opening, so that the airflow flows through the inside of the rotor when the rotor rotates, directly cools the magnetic steel, and effectively reduces the temperature of the rotor when the motor is running.

[0089] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0090] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0091] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0092] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0093] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotor core (10), wherein the rotor core (10) is provided with a reinforcement groove (11); A permanent magnet (20), wherein the permanent magnet (20) is arranged in the reinforcement groove (11); A reinforcement member (30) is arranged in the reinforcement groove (11), the reinforcement member (30) being located on a side of the permanent magnet (20) away from the middle of the rotor core (10); at least a portion of the reinforcement member (30) is used to be disposed in contact with the permanent magnet (20); a baffle assembly (50), wherein the baffle assembly (50) is provided with a fixing groove (541) for fixing an end portion of the reinforcement member (30), the fixing groove (541) being arranged opposite to at least a portion of the reinforcement groove (11); The baffle assembly (50) is provided with a flow opening (531) connected to the fixing groove (541), and at least a portion of the end of the reinforcement member (30) is spaced from the fixing groove (541) to form a flow channel; The rotor assembly further comprises: A flow guide (60), the flow guide (60) being arranged to cover the flow opening (531) and protrude from the flow opening (531); a flow guide opening is arranged on the flow guide (60), and the extension direction of the flow guide opening is the same as the rotation direction of the rotor core (10).

2. The rotor assembly according to claim 1, characterized in that: There are a plurality of reinforcement grooves (11), and the plurality of reinforcement grooves (11) are arranged at intervals along the circumferential direction of the rotor core (10); and the permanent magnet (20) and the reinforcement member (30) are arranged in each reinforcement groove (11).

3. The rotor assembly according to claim 1, characterized in that: There are a plurality of permanent magnets (20), and the plurality of permanent magnets (20) are arranged at intervals along the circumferential direction of the rotor core (10) to form a permanent magnet group (40), and at least one permanent magnet (20) in the permanent magnet group (40) is arranged in the reinforcement slot (11) and is attached to the reinforcement member (30) located in the reinforcement slot (11); There are a plurality of permanent magnet groups (40), and the plurality of permanent magnet groups (40) are arranged at intervals along the circumferential direction of the rotor core (10).

4. The rotor assembly according to claim 3, characterized in that: The permanent magnet (20) located in the middle of the permanent magnet group (40) is installed in the reinforcement groove (11) and is arranged in contact with the reinforcement member (30) in the reinforcement groove (11); and / or, The one with the largest cross-sectional area among the plurality of permanent magnets (20) is installed in the reinforcement groove (11) and is arranged in contact with the reinforcement member (30) in the reinforcement groove (11).

5. The rotor assembly according to claim 1, characterized in that: The rotor assembly further comprises: A first baffle assembly (51) and a second baffle assembly (52) are respectively arranged on both sides of the rotor core (10), and the permanent magnet (20) and the reinforcement member (30) are both located between the first baffle assembly (51) and the second baffle assembly (52) so as to limit the position of the permanent magnet (20) and the reinforcement member (30).

6. The rotor assembly according to claim 1, characterized in that The flow guide (60) comprises a first panel (61), a side panel assembly and a second panel (63) which are connected in sequence, and the first panel (61) and the second panel (63) are arranged opposite to each other and at a distance; The side panel assembly comprises a first side panel (621) and a second side panel (622) which are connected to each other, the drainage opening is arranged on the first side panel (621), the second side panel (622) is an arc-shaped panel, and the first side panel (621) and the second side panel (622) are connected at a preset angle.

7. The rotor assembly according to claim 1, characterized in that The baffle assembly (50) comprises an outer baffle (53) and an inner baffle (54) which are connected to each other; the outer baffle (53) is located on a side of the inner baffle (54) away from the rotor core (10); the fixing groove (541) is arranged on the inner baffle (54); the reinforcement member (30) comprises a first reinforcement portion (31) and a second reinforcement portion (32) which are connected to each other, the first reinforcement portion (31) being used to be arranged in contact with the permanent magnet (20), and the second reinforcement portion (32) being arranged at a distance from the permanent magnet (20) to form a first circulation channel; an end portion of the second reinforcement portion (32) is arranged at a distance from a groove wall of the fixing groove (541) to form a second circulation channel which is connected to the first circulation channel; The outer baffle plate (53) is provided with a flow port (531) for introducing gas, and the flow port (531) is connected to the second flow channel; the flow port (531) is arranged opposite to the fixing groove (541), and at least part of the edge of the flow port (531) protrudes from the edge of the fixing groove (541).

8. The rotor assembly according to claim 1, characterized in that The reinforcement member (30) is a plate-like structure, and two sides of the plate-like structure are respectively used to fit with the permanent magnet (20) and the groove wall of the reinforcement groove (11); or, The reinforcing member (30) comprises a first reinforcing portion (31) and a second reinforcing portion (32) which are connected to each other, wherein the first reinforcing portion (31) is used to be disposed in contact with the permanent magnet (20), and the second reinforcing portion (32) is disposed at a distance from the permanent magnet (20).

9. The rotor assembly according to claim 1, characterized in that: The reinforcing member (30) comprises a first reinforcing portion (31) and a second reinforcing portion (32) which are connected to each other, wherein the first reinforcing portion (31) is used to be arranged in contact with the permanent magnet (20), and the second reinforcing portion (32) is arranged at a distance from the permanent magnet (20); Wherein, there are two first reinforcement parts (31), and the two first reinforcement parts (31) are respectively located on both sides of the second reinforcement part (32); and / or, The reinforcement member (30) further comprises a flow guiding protrusion (33), wherein the flow guiding protrusion (33) is arranged on the second reinforcement portion (32) and is located on a side of the second reinforcement portion (32) close to the permanent magnet (20), and the flow guiding protrusion (33) is extended along an extension direction of the reinforcement member (30).

10. The rotor assembly according to claim 1, characterized in that The reinforcement groove (11) comprises a first reinforcement groove (111) and a second reinforcement groove (112) which are connected to each other, wherein the first reinforcement groove (111) is used to accommodate the permanent magnet (20) and is disposed in a manner compatible with the permanent magnet (20); and the second reinforcement groove (112) is used to accommodate the reinforcement member (30) and is disposed in a manner compatible with the reinforcement member (30); wherein 1 / 2≤D / d≤3 / 4, D is the width of the second reinforcement groove (112) along the circumferential direction of the rotor core (10), and d is the width of the permanent magnet (20) along the circumferential direction of the rotor core (10); and / or, 1 / 3≤H / h≤1 / 2, H is the thickness of the second reinforcement groove (112) along the radial direction of the rotor core (10), and h is the thickness of the permanent magnet (20) along the radial direction of the rotor core (10); and / or, The reinforcement member (30) is made of a high magnetic permeability material.

11. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 10.

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