Rotor assembly and motor using same

Abstract

The utility model discloses a rotor assembly and a motor using the same, and relates to the technical field of motors and parts thereof, and the rotor assembly comprises a rotor iron core, permanent magnets and elastic fixing members. The rotor iron core comprises a central part and a plurality of pole parts which are distributed along the circumferential direction of the central part at intervals, and permanent magnet slots are formed between adjacent pole parts; the permanent magnets are inserted into the permanent magnet slots of the rotor iron core; at least one part of the elastic fixing piece abuts against the pole part of the rotor iron core, and at least the other part of the elastic fixing piece abuts against the permanent magnet, so that the permanent magnet is fixed in the permanent magnet slot of the rotor iron core. The utility model mainly solves the problem of how to provide a rotor assembly which can be quickly assembled and is stable in electromagnetic performance and mechanical performance. The stress positions and sizes of the permanent magnets and the pole parts of the rotor core are roughly balanced, the electromagnetic performance and the mechanical performance of the rotor assembly are not affected, the performance stability of the rotor assembly and the motor is effectively improved, and the service life of the rotor assembly and the motor is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motors and parts thereof, in particular to a rotor assembly and a motor using the rotor assembly. Background Art

[0002] The rotor assembly can provide output power and is one of the core components of the motor. The permanent magnet rotor assembly is an important type of rotor assembly, which is composed of permanent magnets with a certain number of pole pairs embedded on the surface of the rotor core or embedded inside the core.

[0003] In the past, adhesive was usually used to fix the permanent magnets in the rotor core, which obviously has a series of disadvantages such as long adhesive curing time, high cost and complicated assembly operation.

[0004] The Chinese invention patent publication with publication number CN104321951B and titled "A motor rotor and corresponding assembly method" discloses a typical permanent magnet rotor assembly, which includes a laminated core or assembly 2 of a plurality of lamination structures, the laminated core having a main axis R and a plurality of poles 3a, 3b, and these poles define a plurality of seats 4. The poles or teeth 3a, 3b are in the form of sectors, which extend radially from the central core of the laminated core 2. The seats 4 are also radial and extend (in the length direction) according to the main axis R, and each seat is defined by a first pole 3a and a second pole 3b. The rotor 1 includes magnets 5, and the example shows 8 magnets, each of which is inserted into a corresponding seat 4. The rotor includes an elastic device for locking the magnets 5 in the seat 4, the elastic device acting between each magnet 5 and the first pole 3a defining the corresponding seat 4, and is used to push each magnet 5 toward the second pole 3b defining the same seat 4.

[0005] The permanent magnet rotor assembly of the above structure has an elastic device acting between each magnet 5 and the first pole 3a defining the corresponding seat 4, and is used to push each magnet 5 toward the second pole 3b defining the same seat 4. Each magnet 5 is only subjected to force on one side, and the seat 4 of each laminated core 2 is also only subjected to force on the second pole 3b. After long-term use, the seat 4 of the laminated core 2 will be deformed due to uneven force, affecting the electromagnetic and mechanical properties of the permanent magnet rotor assembly, and further affecting the performance and service life of the motor.

[0006] In summary, how to provide a rotor assembly that can be quickly assembled and has stable electromagnetic and mechanical properties has become an urgent problem to be solved. Utility Model Content

[0007] The utility model aims to provide a rotor assembly and a motor using the same, which has the characteristics of being able to be assembled quickly and having stable electromagnetic and mechanical properties.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rotor assembly, comprising a rotor core, a permanent magnet and an elastic fixing member; the rotor core comprises a central portion, and a plurality of pole portions circumferentially spaced along the central portion, and permanent magnet slots are formed between adjacent pole portions; the permanent magnet is inserted into the permanent magnet slot of the rotor core; at least a portion of the elastic fixing member abuts against the pole portion of the rotor core, and at least another portion of the elastic fixing member abuts against the permanent magnet, so as to fix the permanent magnet in the permanent magnet slot of the rotor core.

[0009] In the above technical solution, the elastic fixing member includes two clamping arms arranged parallel to each other, and connecting arms respectively connected to the two clamping arms.

[0010] In the above technical solution, the elastic fixing member is arranged across the permanent magnet slot of the rotor core, so that the two clamping arms of the elastic fixing member respectively abut against the adjacent poles and clamp the permanent magnet from both sides.

[0011] In the above technical solution, the connecting arm of the elastic fixing member is in close contact with the permanent magnet, or there is a gap between the connecting arm of the elastic fixing member and the permanent magnet.

[0012] In the above technical solution, the elastic fixing member spans over the pole portion of the rotor core so that the two clamping arms of the elastic fixing member are respectively located in two adjacent permanent magnet slots; for any one of the clamping arms: one side thereof abuts against the pole portion, and the other side thereof abuts against the permanent magnet.

[0013] In the above technical solution, the connecting arm of the elastic fixing member is in close contact with the end face of the pole portion of the rotor core, or there is a gap between the connecting arm of the elastic fixing member and the pole portion of the rotor core.

[0014] In the above technical solution, at least one clamping arm of the elastic fixing member is bent to form a plurality of bent portions; the bent portions of the elastic fixing member are suitable for applying pressure to the permanent magnet, and / or the bent portions of the elastic fixing member are suitable for applying pressure to the poles of the rotor core.

[0015] In the above technical solution, a positioning groove is formed on the pole portion of the rotor core, and the clamping arm of the elastic fixing member can be embedded in the positioning groove of the rotor core.

[0016] In the above technical solution, the elastic fixing member is made by bending a metal wire with a circular cross-section, and / or the elastic fixing member is made by bending a metal strip with a square or elliptical cross-section.

[0017] A motor comprises the above-mentioned rotor assembly.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows: in the rotor assembly of the utility model and the motor using the same, at least a portion of the elastic fixing member abuts against the pole portion of the rotor core, and at least another portion of the elastic fixing member abuts against the permanent magnet, so as to fix the permanent magnet in the permanent magnet slot of the rotor core; in this way, the assembly process of the rotor assembly is simple and efficient, the assembly efficiency is improved, and the assembly cost is reduced; in addition, the force positions and sizes of the permanent magnets and the pole portions of the rotor core are roughly balanced, which will not affect the electromagnetic properties and mechanical properties of the rotor assembly, and effectively improves the performance stability and service life of the rotor assembly and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the structural views of the present utility model.

[0020] Figure 2 This is the second structural view of the present utility model.

[0021] Figure 3 This is one of the structural views of the elastic fixing member in the utility model.

[0022] Figure 4 This is the third structural view of the present utility model.

[0023] Figure 5 This is the fourth structural view of the present utility model.

[0024] Figure 6 This is the fifth structural view of the present utility model.

[0025] Figure 7 This is the second structural view of the elastic fixing member in the utility model.

[0026] Figure 8 This is the third structural view of the elastic fixing member in the utility model.

[0027] Fig. 9 This is the sixth structural view of the present utility model.

[0028] Fig.10 This is the seventh structural view of the present utility model.

[0029] The figures are marked as follows: 1. rotor core; 11. center portion; 12. pole portion; 121. positioning groove; 13. permanent magnet slot; 2. permanent magnet; 3. elastic fixing member; 31. clamping arm; 311. bending portion; 32. connecting arm. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] This embodiment provides a rotor assembly, specifically a permanent magnet rotor assembly, which can rotate under the drive of a magnetic field and is used as a power component of an electric motor.

[0032] Please refer to Figure 1-Figure 7 , the rotor assembly of this embodiment includes a rotor core 1, a permanent magnet 2, and an elastic fixing member 3.

[0033] Among them, the rotor core 1 has good magnetic conductivity. It can be a metal body stacked by a plurality of silicon steel sheets, or a solid metal body formed by integral die-casting or machining; the permanent magnet 2 is a block with permanent magnetism. In this embodiment, the permanent magnet 2 is square; the elastic fixing member 3 is an integrally formed metal workpiece with a certain elasticity.

[0034] The rotor core 1 includes a central portion 11, and a plurality of pole portions 12 circumferentially spaced apart along the central portion 11. And a permanent magnet slot 13 is formed between adjacent pole portions 12. In fact, the permanent magnet slot 13 of the rotor core 1 matches the shape and number of the permanent magnets 2.

[0035] The permanent magnet 2 is inserted into the permanent magnet slot 13 of the rotor core 1. At this time, the outer contour of the permanent magnet 2 generally fits the permanent magnet slot 13; at least a part of the elastic fixing member 3 abuts against the pole portion 12 of the rotor core 1, and at least another part of the elastic fixing member 3 abuts against the permanent magnet 2 to fix the permanent magnet 2 in the permanent magnet slot 13 of the rotor core 1.

[0036] Specifically, the elastic fixing member 3 includes two clamping arms 31 arranged in parallel, and a connecting arm 32 respectively connected to the two clamping arms 31 to form the elastic fixing member 3, so that the elastic fixing member 3 is generally in an inverted U shape. In fact, the connecting arm 32 and the two clamping arms 31 are an integrally formed structure.

[0037] Further specifically, the elastic fixing member 3 is made by bending a metal wire with a circular cross-section (as shown in Figure 3 ), and / or the elastic fixing member 3 is made by bending a metal strip with a square cross-section (as shown in Figure 7 ) or an elliptical cross-section (not shown in the figure); it can be understood that the material constituting the elastic fixing member 3 should have a certain toughness so that the formed elastic fixing member 3 has a certain elasticity.

[0038] See also Figure 1 , Figure 4 and Fig. 9 In some possible embodiments, the elastic fixing member 3 is arranged across the permanent magnet slot 13 of the rotor core 1, so that the two clamping arms 31 of the elastic fixing member 3 are respectively against the adjacent poles 12, and clamp the permanent magnet 2 from both sides; in this case, the two clamping arms 31 of the elastic fixing member 3 are subjected to inward pressure applied by the adjacent poles 12, and apply inward pressure to the permanent magnet 2 from both sides, thereby clamping the permanent magnet 2. At this time, the force positions and magnitudes of each permanent magnet 2 and each pole 12 of the rotor core 1 are roughly balanced, and will not affect the electromagnetic and mechanical properties of the rotor assembly.

[0039] Furthermore, the connecting arm 32 of the elastic fixing member 3 is in close contact with the permanent magnet 2, so that the integration degree of the rotor assembly is higher, or there is a gap between the connecting arm 32 of the elastic fixing member 3 and the permanent magnet 2, which can improve the heat dissipation performance of the permanent magnet 2 and the elastic fixing member 3 to a certain extent; in fact, the elastic fixing member 3 made by bending a metal strip with a square cross section has a flat surface, which is suitable for fitting with the permanent magnet 2. Figure 4 That is, it shows that the connecting arm 32 of the elastic fixing member 3 is in close contact with the permanent magnet 2. Figure 1 The situation where there is a gap between the connecting arm 32 of the elastic fixing member 3 and the permanent magnet 2 is shown.

[0040] See also Figure 2 , Figure 5 , Figure 6 and Fig.10 In some other possible embodiments, the elastic fixing member 3 crosses the pole portion 12 of the rotor core 1, so that the two clamping arms 31 of the elastic fixing member 3 are respectively located in two adjacent permanent magnet slots 13; for any clamping arm 31: one side thereof abuts against the pole portion 12, and the other side thereof abuts against the permanent magnet 2; in this case, the two clamping arms 31 of the elastic fixing member 3 respectively apply thrust to the two adjacent permanent magnets 2, and similarly, the other side of the permanent magnet 2 is also subjected to the thrust of the clamping arm 31 of another elastic fixing member 3, so that the permanent magnet 2 can be clamped. At this time, the force positions and magnitudes of each permanent magnet 2 and each pole portion 12 of the rotor core 1 are also roughly balanced, and will not affect the electromagnetic and mechanical properties of the rotor assembly.

[0041] Furthermore, the connecting arm 32 of the elastic fixing member 3 is in close contact with the end face of the pole portion 12 of the rotor core 1, so that the integration degree of the rotor assembly is higher, or there is a gap between the connecting arm 32 of the elastic fixing member 3 and the pole portion 12 of the rotor core 1, which can improve the heat dissipation performance of the permanent magnet 2 and the rotor core 1 to a certain extent; in fact, the elastic fixing member 3 made by bending a metal strip with a square cross section has a flat surface on its connecting arm 32, which is suitable for fitting with the pole portion 12 of the rotor core 1. Figure 5 That is, it shows that the connecting arm 32 of the elastic fixing member 3 is in close contact with the end surface of the pole portion 12 of the rotor core 1. Figure 2 and Figure 6 It shows the situation where there is a gap between the connecting arm 32 of the elastic fixing member 3 and the pole portion 12 of the rotor core 1.

[0042] See also Figure 3 and Figure 7 Furthermore, at least one clamping arm 31 of the elastic fixing member 3 is bent to form a plurality of bent portions 311. In fact, the clamping arm 31 of the elastic fixing member 3 is bent to form an arched portion on its surface, namely the bent portion 311; the bent portion 311 of the elastic fixing member 3 is suitable for applying pressure to the permanent magnet 2, and / or the bent portion 311 of the elastic fixing member 3 is suitable for applying pressure to the pole portion 12 of the rotor core 1. In this way, the force applied by the elastic fixing member 3 to the permanent magnet 2 can be further increased, so that the permanent magnet 2 is not easily dislocated; it can be understood that the elastic fixing member 3 can form a bent portion 311 for both clamping arms 31, or only one clamping arm 31 can form a bent portion 311 (such as Figure 8 shown), Fig. 9 and Fig.10 FIG. 4 shows the overall structural view of the rotor assembly when only one clamping arm 31 forms a bent portion 311 .

[0043] Furthermore, the pole portion 12 of the rotor core 1 is formed with a positioning groove 121, and the clamping arm 31 of the elastic fixing member 3 can be embedded in the positioning groove 121 of the rotor core 1; the positioning groove 121 is provided to prevent the elastic fixing member 3 from being dislocated and reduce the difficulty of assembling the elastic fixing member 3.

[0044] The rotor assembly of this embodiment requires prefabricated rotor core 1, permanent magnet 2 and elastic fixing member 3; during assembly, each permanent magnet 2 is first inserted into each permanent magnet slot 13 of the rotor core 1, and then the clamping arm 31 of each elastic fixing member 3 is pressed into each positioning groove 121 of the rotor core 1 using a tool, and the assembly is completed. The assembly process is simple and efficient, which improves assembly efficiency and reduces assembly cost.

[0045] This embodiment also provides a motor, which includes the above-mentioned rotor assembly.

[0046] In the rotor assembly of this embodiment and the motor using the same, at least a portion of the elastic fixing member 3 abuts against the pole portion 12 of the rotor core 1, and at least another portion of the elastic fixing member 3 abuts against the permanent magnet 2, so as to fix the permanent magnet 2 in the permanent magnet slot 13 of the rotor core 1; in this way, the assembly process of the rotor assembly is simple and efficient, the assembly efficiency is improved, and the assembly cost is reduced; in addition, the force positions and sizes of each permanent magnet 2 and each pole portion 12 of the rotor core 1 are roughly balanced, which will not affect the electromagnetic performance and mechanical performance of the rotor assembly, and effectively improves the performance stability and service life of the rotor assembly and the motor.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: It includes a rotor core, a permanent magnet and an elastic fixing part; The rotor core comprises a central portion and a plurality of pole portions spaced apart circumferentially along the central portion, and permanent magnet slots are formed between adjacent pole portions; The permanent magnet is inserted into the permanent magnet slot of the rotor core; At least a portion of the elastic fixing member abuts against the pole portion of the rotor core, and at least another portion of the elastic fixing member abuts against the permanent magnet, so as to fix the permanent magnet in the permanent magnet slot of the rotor core.

2. The rotor assembly according to claim 1, characterized in that The elastic fixing member includes two clamping arms arranged parallel to each other, and connecting arms respectively connected to the two clamping arms.

3. The rotor assembly according to claim 2, characterized in that: The elastic fixing member is arranged across the permanent magnet slot of the rotor core, so that the two clamping arms of the elastic fixing member are respectively against the adjacent poles and clamp the permanent magnet from both sides.

4. The rotor assembly according to claim 3, characterized in that: The connecting arm of the elastic fixing member is in close contact with the permanent magnet, or there is a gap between the connecting arm of the elastic fixing member and the permanent magnet.

5. The rotor assembly according to claim 2, characterized in that: The elastic fixing member crosses the pole portion of the rotor core, so that the two clamping arms of the elastic fixing member are respectively located in two adjacent permanent magnet slots; For any one of the clamping arms: one side thereof abuts against the pole portion, and the other side thereof abuts against the permanent magnet.

6. The rotor assembly according to claim 5, characterized in that The connecting arm of the elastic fixing member is in close contact with the end surface of the pole portion of the rotor core, or there is a gap between the connecting arm of the elastic fixing member and the pole portion of the rotor core.

7. The rotor assembly according to any one of claims 2 to 6, characterized in that: At least one clamping arm of the elastic fixing member is bent to form a plurality of bent portions; The bent portion of the elastic fixing member is suitable for applying pressure to the permanent magnet, and / or the bent portion of the elastic fixing member is suitable for applying pressure to the pole portion of the rotor core.

8. The rotor assembly according to any one of claims 2 to 6, characterized in that: The pole portion of the rotor core is formed with a positioning groove, and the clamping arm of the elastic fixing member can be embedded in the positioning groove of the rotor core.

9. The rotor assembly according to any one of claims 1 to 6, characterized in that: The elastic fixing piece is made by bending a metal wire with a circular cross section, and / or the elastic fixing piece is made by bending a metal strip with a square or oval cross section.

10. A motor, characterized in that: A rotor assembly comprising any one of claims 1-9.

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