CN216056532U - Rotor subassembly and have its motor - Google Patents

Abstract

The application provides a rotor assembly and a motor with the same, and the rotor assembly comprises a rotor body and a limiting structure, wherein the rotor body comprises a rotor iron core and a magnetic steel part; the limiting structure is arranged on the rotor body, a first limiting groove and a second limiting groove are arranged on the limiting structure, and the magnetic steel part is limited in the first limiting groove; the rotor core is limited in the second limiting groove. According to the rotor subassembly and have its motor of this application, can effectively carry on spacingly to the rotor body, and reduce the rejection rate.

Description

Rotor subassembly and have its motor

Technical Field

The application belongs to the technical field of motors, and particularly relates to a rotor assembly and a motor with the same.

Background

At present, for a low-power motor, a permanent magnet rotor generally adopts a plastic packaging structure to limit a rotor body and simultaneously ensure the rigidity requirement of the rotor structure, but the plastic packaging structure is easy to crack in the process of a rotor shaft entering tool, and the rejection rate is increased.

Therefore, how to provide a rotor assembly capable of effectively limiting the rotor body and reducing the rejection rate and a motor having the same become problems to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a rotor subassembly and have its motor, can effectively carry on spacingly to the rotor body, and reduce the rejection rate.

In order to solve the above problems, the present application provides a rotor assembly including:

the rotor body comprises a rotor iron core and a magnetic steel part;

the limiting structure is arranged on the rotor body and provided with a first limiting groove and a second limiting groove, and the magnetic steel part is limited in the first limiting groove; the rotor core is limited in the second limiting groove.

Further, the rotor core comprises a first core, the first core comprises a plurality of core parts, the core parts are sequentially arranged along the circumferential direction to form the first core, a first groove is formed between every two adjacent core parts, and the magnetic steel part is positioned in the first groove; the magnetic steel part is limited in the first limiting groove; the iron core part is limited in the second limiting groove.

Further, limit structure is including the annular tip and the axial extension that connect gradually, and the annular tip is used for carrying out ascending spacing to iron core portion and magnet steel portion, and axial extension is located the inner peripheral side of annular tip, and the annular tip sets up in the tip of rotor body, and the axial extension sets up in the inner peripheral side of iron core portion.

Further, a second limit groove is arranged on the axial extension part, and/or a dovetail part is arranged on the inner peripheral side of the iron core part; the dovetail part is limited in the second limiting groove, and the shape and the size of the second limiting groove correspond to those of the dovetail part.

Further, first spacing groove sets up in annular end portion, and the tip protrusion in the tip of iron core portion of magnet steel portion, the tip of magnet steel portion is spacing in first spacing inslot.

Furthermore, the rotor core also comprises a second core, and a second groove and a shaft hole are formed in the second core; the first iron core is arranged at the end part of the second iron core, the first groove and the second groove are corresponding in position, the first groove and the second groove are communicated to form a magnetic steel groove, and the magnetic steel part is arranged in the magnetic steel groove.

Furthermore, the second iron core comprises a slotted area and a fixed area which are sequentially connected in the direction close to the shaft hole, and the shaft hole is positioned on the inner peripheral side of the fixed area; the magnetic steel groove is arranged in the grooving area; the first iron core is arranged at the end part of the slotted zone.

Furthermore, the number of the first iron cores is two, and the two first iron cores are respectively arranged at two ends of the second iron core;

and/or the number of the limiting structures is two, and the two limiting structures are respectively arranged at two ends of the rotor body;

and/or the limiting structure is manufactured by a casting process.

Further, when the second iron core includes to being close to slotted zone and the fixed zone that connects gradually in the shaft hole direction, limit structure includes the fixed part, and the fixed part sets up on the fixed zone to the fixed part passes through the fastener with the fixed zone and is connected.

Further, when limit structure includes annular end and the axial extension portion that connects gradually, the fixed part is connected with the axial extension portion.

According to yet another aspect of the present application, there is provided an electric machine comprising a rotor assembly as described above.

The application provides a rotor subassembly and have its motor, carry on spacingly to magnet steel portion through first spacing groove, the second spacing groove is spacing to rotor core, can effectively carry on spacingly to rotor body, and reduces the rejection rate.

Drawings

FIG. 1 is a schematic structural view of a rotor assembly according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first core according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a second core according to an embodiment of the present application;

fig. 4 is a schematic structural view of a rotor core according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a rotor body according to an embodiment of the present application;

FIG. 6 is a cross-sectional view of a rotor assembly according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a limiting structure according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a limiting structure according to an embodiment of the present application;

FIG. 9 is a schematic structural view of a rotor assembly according to an embodiment of the present application;

fig. 10 is a cross-sectional view of a rotor assembly according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotor body; 11. a first iron core; 111. an iron core portion; 1111. a swallowtail; 112. a first groove; 12. a second iron core; 121. a grooving area; 1211. a second groove; 122. a shaft hole; 123. a fixed zone; 2. a magnetic steel part; 3. a limiting structure; 31. an annular end portion; 32. an axial extension; 33. a fixed part; 34. a first limit groove; 35. a second limit groove; 5. a fastener; 6. a rotating shaft.

Detailed Description

Referring to fig. 1-10 in combination, a rotor assembly includes a rotor body 1 and a limiting structure 3, wherein the rotor body 1 includes a rotor core and a magnetic steel part 2; the limiting structure 3 is arranged on the rotor body 1, a first limiting groove 34 and a second limiting groove 35 are arranged on the limiting structure 3, and the magnetic steel part 2 is limited in the first limiting groove 34; rotor core is spacing in second spacing inslot 35, carries on spacingly to magnet steel portion 2 through first spacing groove 34, and second spacing groove 35 carries on spacingly to rotor core, can effectively carry on spacingly to rotor body 1, and reduces the rejection rate. Adopt limit structure 3 to carry on spacingly in this application, cancelled the plastic packaging structure, avoided rotor surface to produce the crackle, improve rotor quality. The plastic packaging rotor process is cancelled, the rotor structure is simple, the time of plastic packaging and shaping and heat dissipation is saved in the production process, the manufacturing and the assembly are easy, and great competitive advantages exist in the aspects of production efficiency, cost and rotor weight. The limiting structure 3 is utilized to control the relative position of the rotor core and the magnetic steel part 2, and the requirement of the rigidity of the rotor is ensured. The rotor assembly is a permanent magnet motor rotor.

The application also discloses some embodiments, the rotor core comprises a first core 11, the first core 11 comprises a plurality of core parts 111, the plurality of core parts 111 are sequentially arranged along the circumferential direction to form the first core 11, a first slot 112 is formed between two adjacent core parts 111, and the magnetic steel part 2 is positioned in the first slot 112; the magnetic steel part 2 is limited in the first limit groove 34; the core portion 111 is retained in the second retaining groove 35.

The application also discloses some embodiments, limit structure 3 includes annular tip 31 and the axial extension portion 32 that connects gradually, and annular tip 31 is used for carrying out the ascending spacing to iron core portion 111 and magnet steel portion 2, and axial extension portion 32 is located the inner peripheral side of annular tip 31, and annular tip 31 sets up in the tip of rotor body 1, and axial extension portion 32 sets up in the inner peripheral side of iron core portion 111.

The present application also discloses embodiments wherein a second retaining groove 35 is provided on the axially extending portion 32.

The present application also discloses some embodiments, the inner peripheral side of the iron core portion 111 is provided with a dovetail 1111; the dovetail portion 1111 is limited in the second limiting groove 35, and the shape and size of the second limiting groove 35 correspond to the shape and size of the dovetail portion 1111. The second limit groove 35 is configured to correspond to the dovetail groove of the dovetail portion 1111. First iron core 11 is also folded by same kind of rotor punching and is pressed and form, only needs one process can be punched and accomplish, and the afterbody of iron core portion 111 adopts the forked tail structure for play limit structure 3's effect to first iron core 11.

The application also discloses some embodiments, first spacing groove 34 sets up in annular end portion 31, and the tip protrusion in the tip of iron core portion 111 of magnet steel portion 2, and the tip of magnet steel portion 2 is spacing in first spacing groove 34. First spacing portion is the rectangle recess, increases the design of dovetail recess and rectangle recess to limit structure 3, makes two recesses and iron core portion 111, satisfies spacing requirement between magnet steel portion 2 to guarantee iron core portion 111 and magnet steel portion 2's relative fixed position.

The application also discloses some embodiments, the rotor core further includes a second core 12, the second core 12 is provided with a second slot 1211 and a shaft hole 122; the first core 11 is disposed at an end of the second core 12, the first slot 112 and the second slot 1211 are corresponding in position, the first slot 112 and the second slot 1211 are communicated to form a magnetic steel slot, and the magnetic steel portion 2 is disposed in the magnetic steel slot. The rotor core is composed of a first core 11, a second core 12 and the first core 11 which are respectively overlapped according to one third, so that the inner aperture of the first core 11 is larger than that of the two cores, the second core 12 in the middle is used for transmitting torque, and namely the rotating shaft 6 is matched and connected with the shaft hole 122 of the second core 12. The second iron core 12 is formed by laminating the same type of rotor punching sheet, the punching can be completed by only one process, the mold cost is greatly reduced, the production efficiency is improved, and the lamination thickness of the second iron core 12 in the middle part is one third of the lamination thickness of the whole rotor iron core.

The application also discloses some embodiments, the second iron core 12 includes a slotted zone 121 and a fixed zone 123 which are connected in sequence towards the direction close to the shaft hole 122, the shaft hole 122 is located at the inner peripheral side of the fixed zone 123; the magnetic steel groove is arranged in the grooving area 121; the first core 11 is disposed at an end of the slotted zone 121. The inner peripheral side of the core part 111 forms the shaft hole 122 of the first core 11 part, namely the diameter of the shaft hole 122 of the first core 11 part is larger than that of the shaft hole 122 of the second core 12, so that the use amount of the rotor core can be reduced; the inventor researches and discovers that for the permanent magnet rotor, the magnetic flux in the rotor core close to the rotor shaft is leakage magnetic flux and hardly influences the performance of the motor, and the rotor core is omitted in the application, so that the weight of the rotor body 1 is effectively reduced, and the cost is reduced. The weight of the rotor is reduced, and the competitive advantage of the motor in the field of aerospace can be improved. The utility model provides a limit structure 3 can be effectual carry on spacingly to iron core portion 111 and magnet steel portion 2 to guarantee the relative fixed position of iron core portion 111 and magnet steel portion 2. The rotor quality is improved, the rotor manufacturing efficiency is improved, the self weight of the rotor is reduced, and the rotor manufacturing cost is saved. The inner diameter of the first core 11 is made larger than the inner diameter of the middle portion second core 12, and the middle portion second core 12 transmits torque. The rotor quality is improved, the rotor manufacturing efficiency is improved, the self weight of the rotor is reduced, and the rotor manufacturing cost is saved.

The application also discloses some embodiments, the number of the first iron cores 11 is two, and the two first iron cores 11 are respectively arranged at two ends of the second iron core 12; first iron core 11 includes two, arranges the both ends of middle part second iron core 12 in respectively, and its stack thickness respectively accounts for whole rotor core and folds thick one third, and the inner aperture of iron core portion 111 is greater than the inner aperture of middle part rotor core for the holistic weight of rotor reduces, utilizes middle part second iron core 12 transmission moment of torsion, is favorable to improving vibration noise.

The application also discloses some embodiments, the number of the limiting structures 3 is two, and the two limiting structures 3 are respectively arranged at two ends of the rotor body 1;

the application also discloses embodiments, wherein the limiting structure 3 is made by a casting process. The limiting structure 3 formed by casting in a casting process, namely the casting baffle plate, limits and fixes the iron core part 111 and the magnetic steel part 2 by using the self limiting structure 3.

The application also discloses some embodiments, when the second core 12 includes the slotted zone 121 and the fixed zone 123 which are sequentially connected to the direction close to the shaft hole 122, the limiting structure 3 includes the fixing portion 33, the fixing portion 33 is disposed on the fixed zone 123, and the fixing portion 33 and the fixed zone 123 are connected through the fastener 5. The fastening element 5 may be a screw, a rivet, etc., for example, corresponding fastening holes are formed on the fastening area 123 and the fastening portion 33, and the fastening element 5, such as a rivet, fastens the fastening portion 33 and the fastening hole on the fastening area 123. Respectively assembling the first iron cores 11 at two ends of the middle part second iron core 12, so that the first iron cores 11 and the middle part second iron core 12 are arranged in order, and a first groove 112 part is reserved; the first groove 112 and the second groove 1211 on the second iron core 12 form a magnetic steel groove, a plurality of magnetic steel parts 2 are sequentially embedded into the magnetic steel groove, casting baffles, namely limiting structures 3 are respectively assembled on two sides of the rotor iron core, dovetail grooves of the casting baffles are matched with the iron core part 111, and the dovetail planes limit the iron core part 111 axially; the dovetail-shaped plane is a screen formed between two adjacent limiting grooves after the second limiting groove 35 is started on the annular end surface, so that the two end parts of the magnetic steel are embedded in the rectangular groove of the cast baffle, namely the first limiting groove 34, and the magnetic steel part 2 is axially limited; by utilizing a riveting process, two cast baffles, namely the limiting structures 3 positioned at two ends of the rotor and the second iron core 12 at the middle part are connected together by rivets.

The application also discloses embodiments in which, when the limiting structure 3 comprises an annular end portion 31 and an axially extending portion 32 connected in series, the fixing portion 33 is connected to the axially extending portion 32. The limiting structure 3, namely the casting baffle, is formed by pouring metal materials, the whole thickness is approximately the thickness of a sheet of stamped steel, the shape of the limiting structure is similar to a straw hat, and the limiting structure is divided into an upper part and a lower part. The upper part consists of a round bottle structure with holes and a plurality of trapezoidal columns which are arrayed by concentric shafts of the round bottle structure, and a dovetail groove structure is formed between every two trapezoidal columns; the round bottle structure is provided with a rotor shaft hole 122 and rivet holes with 180-degree difference; the dovetail groove structure is used for embedding a spliced rotor core trapezoidal column, a round small hole is formed in the middle of the spliced rotor core trapezoidal column, and the size of the small hole can be set according to actual strength requirements and is used for reducing materials. The lower part is designed by a folding circular ring, and the rectangular groove design part is used for limiting the magnetic steel axially; the dovetail-shaped plane design part is used for limiting the axial direction of the split rotor.

The method solves the problem that the production of the rotor is abnormal due to the cracks on the surface of the plastic packaging material of the traditional plastic packaging rotor; second, the rotor assembly of the present application is reduced in weight compared to a conventional rotor of the same size.

This application has the assembly mode:

the fixed part 33 and the axial extension part 32 of the casting baffle plate, namely the limiting structure 3, are arranged at the lower part, the fixed part 33 is arranged in a tool at the upper part, and the iron core parts 111 are sequentially embedded into the dovetail-shaped grooves of the casting baffle plate; placing a middle part rotor core on the first core 11, assembling another first core 11 on the second core 12, namely respectively assembling the first cores 11 with the same stacking height as the second core 12 at two ends of the middle part second core 12, embedding a plurality of magnetic steel parts 2 into magnetic steel grooves, enabling a second casting baffle plate, namely a fixing part 33 and an axial extension part 32 of a limiting structure 3, to be positioned below, and assembling an annular end part 31 on the rotor core above; and inserting rivets into the two reserved rivet holes with the phase difference of 180 degrees, fixing by using a riveting process, and pressing the rivets into the rotor shaft. The assembling sequence is that a casting baffle is positioned on a tool, the iron core part 111 of a first iron core 11 is embedded into a dovetail-shaped groove of the casting baffle in sequence, then the middle second iron core 12 and the first iron core 11 are positioned, the non-magnetized magnetic steel part 2 is embedded into the first iron core 11, then another first iron core 11 is placed on the second iron core 12 in sequence, then another casting baffle is assembled, and a rivet penetrates through the casting baffle and the second iron core 12 to be riveted. The rotor is simple in structure, easy to manufacture and assemble and capable of saving production time.

According to an embodiment of the present application, there is provided an electric machine including a rotor assembly as described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (11)

1. A rotor assembly, comprising:

the rotor comprises a rotor body (1), wherein the rotor body (1) comprises a rotor iron core and a magnetic steel part (2);

the limiting structure (3) is arranged on the rotor body (1), a first limiting groove (34) and a second limiting groove (35) are formed in the limiting structure (3), and the magnetic steel part (2) is limited in the first limiting groove (34); the rotor core is limited in the second limiting groove (35).

2. The rotor assembly according to claim 1, wherein the rotor core comprises a first core (11), the first core (11) comprises a plurality of core portions (111), the plurality of core portions (111) are sequentially arranged along a circumferential direction to form the first core (11), a first groove (112) is formed between two adjacent core portions (111), and the magnetic steel portion (2) is located in the first groove (112); the magnetic steel part (2) is limited in the first limiting groove (34); the iron core part (111) is limited in the second limiting groove (35).

3. The rotor assembly according to claim 2, wherein the limiting structure (3) comprises an annular end portion (31) and an axial extension portion (32) which are connected in sequence, the annular end portion (31) is used for axially limiting the iron core portion (111) and the magnetic steel portion (2), the axial extension portion (32) is located on the inner peripheral side of the annular end portion (31), the annular end portion (31) is arranged at the end portion of the rotor body (1), and the axial extension portion (32) is arranged on the inner peripheral side of the iron core portion (111).

4. The rotor assembly according to claim 3, wherein the second limit groove (35) is provided on the axial extension (32); and/or, the inner periphery side of the iron core part (111) is provided with a dovetail part (1111); the swallow tail portion (1111) is limited in the second limiting groove (35), and the shape and the size of the second limiting groove (35) correspond to those of the swallow tail portion (1111).

5. The rotor assembly according to claim 3, wherein the first limiting groove (34) is formed in the annular end portion (31), the end portion of the magnetic steel portion (2) protrudes from the end portion of the core portion (111), and the end portion of the magnetic steel portion (2) is limited in the first limiting groove (34).

6. The rotor assembly of claim 2, wherein the rotor core further comprises a second core (12), the second core (12) having a second slot (1211) and a shaft hole (122) disposed therein; the first iron core (11) is arranged at the end part of the second iron core (12), the positions of the first groove (112) and the second groove (1211) correspond to each other, the first groove (112) and the second groove (1211) are communicated to form a magnetic steel groove, and the magnetic steel part (2) is arranged in the magnetic steel groove.

7. The rotor assembly according to claim 6, wherein the second core (12) includes a slotted region (121) and a fixed region (123) connected in sequence in a direction approaching the shaft hole (122), the shaft hole (122) being located at an inner circumferential side of the fixed region (123); the magnetic steel groove is arranged in the grooving area (121); the first iron core (11) is arranged at the end part of the slotted zone (121).

8. The rotor assembly according to claim 6, wherein the number of the first cores (11) is two, and the two first cores (11) are respectively disposed at both ends of the second core (12);

and/or the number of the limiting structures (3) is two, and the two limiting structures (3) are respectively arranged at two ends of the rotor body (1);

and/or the limiting structure (3) is manufactured by a casting process.

9. The rotor assembly according to claim 7, wherein when the second core (12) includes a slotted region (121) and a fixed region (123) which are sequentially connected in a direction approaching the shaft hole (122), the limiting structure (3) includes a fixed portion (33), the fixed portion (33) is disposed on the fixed region (123), and the fixed portion (33) and the fixed region (123) are connected by a fastening member (5).

10. The rotor assembly according to claim 9, wherein, when the limit structure (3) comprises an annular end portion (31) and an axially extending portion (32) connected in sequence, the fixing portion (33) is connected with the axially extending portion (32).

11. An electrical machine comprising a rotor assembly, wherein the rotor assembly is as claimed in any one of claims 1 to 10.

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