Plastic package motor structure

Abstract

The utility model provides a plastic package motor structure, which comprises a rotor, a stator, a coil, a shell and an end cover, the coil is wound on the stator, the inner wall of the shell is provided with a positioning groove, the stator is fixed in the positioning groove, the shell is made of plastics, the rotor is rotatably connected to the shell and located in the stator, and the end cover is arranged on the rotor. The end cover is connected to the shell, the rotor penetrates through the end cover, the outer wall of the shell is provided with a heat dissipation part which is arranged in a concave mode, and the heat dissipation part corresponds to the coil, so that the purpose of improving heat dissipation performance is achieved.

Description

Technical Field

[0001] The utility model relates to an electric motor, and particularly to a structure of a plastic-encapsulated motor. Background Art

[0002] A plastic-encapsulated motor is a kind of motor that uses plastic encapsulation technology to integrally encapsulate the stator core and coil of the motor with engineering plastics.

[0003] Currently, a Chinese patent with the authorization announcement number CN220754478U discloses a plastic-encapsulated motor, which includes a stator assembly. The stator assembly includes an iron core, a coil, a plastic encapsulation body, and an aluminum shell. The iron core includes an inner ring surface, an outer ring surface, and a coil slot. The coil slot is arranged between the inner ring surface and the outer ring surface. The coil is arranged in the coil slot. The inner wall of the aluminum shell is provided with an iron core positioning surface. The outer ring surface is in interference fit with the iron core positioning surface. The plastic encapsulation body is fixedly arranged between the aluminum shell, the coil, and the iron core. The plastic encapsulation body includes a connected first sub-plastic encapsulation body and a second sub-plastic encapsulation body. The outer wall of the first sub-plastic encapsulation body is attached to the inner wall of the aluminum shell. The second sub-plastic encapsulation body is exposed outside the aluminum shell, so that the outer wall of the aluminum shell and the outer wall of the second sub-plastic encapsulation body form the outer wall of the stator assembly.

[0004] The coil is wound around the iron core, and wire bundles will be formed at both ends of the iron core.

[0005] Compared with the plastic-encapsulated motors in the prior art that are finally cooled by the plastic encapsulation parts, this plastic-encapsulated motor is finally cooled by the aluminum shell, the aluminum front shell, and the plastic encapsulation body together, and the heat dissipation effect is better. However, the wall thickness of this plastic-encapsulated motor is relatively thick, and there will still be problems of heat accumulation. Summary of the Utility Model

[0006] In view of this, the purpose of the utility model is to provide a structure of a plastic-encapsulated motor, which can improve the heat dissipation performance and is not prone to heat accumulation problems by reducing the wall thickness of the shell.

[0007] To solve the above technical problems, the technical solution of the utility model is: a structure of a plastic-encapsulated motor, which includes a rotor, a stator, a coil, a shell, and an end cover. The coil is wound around the stator. A positioning groove is provided on the inner wall of the shell. The stator is fixed in the positioning groove. The shell is made of plastic. The rotor is rotatably connected to the shell and is located inside the stator. The end cover is connected to the shell. The rotor passes through the end cover. A heat dissipation part is provided on the outer wall of the shell and is recessed inward. The heat dissipation part corresponds to the wire bundle.

[0008] By implementing the above technical solution, the coil is wound around the stator, and the wire bundles are located at both ends of the stator. The outer diameter of the wire bundles is smaller than the outer diameter of the stator. Therefore, by providing the heat dissipation part, the wall thickness of the shell near the coil becomes thinner without reducing the structural strength. Moreover, by fixing the stator in the positioning groove, the wall thickness of the shell near the stator also becomes thinner, thereby greatly improving the heat dissipation performance.

[0009] As a preferred embodiment of the present utility model, a heat sink is fixedly connected to the outer wall of the housing, and the length direction of the heat sink is parallel to the axial direction of the housing.

[0010] By implementing the above technical solution, through the arrangement of the heat sink, the heat dissipation performance of the housing is further improved, and the structural strength of the housing can be enhanced.

[0011] As a preferred embodiment of the present utility model, a heat dissipation plate is fixedly connected to the outer wall of the housing, the length direction of the heat dissipation plate is parallel to the axial direction of the housing, elastic grooves are formed in the side wall of the heat dissipation plate, and two adjacent elastic grooves are arranged oppositely.

[0012] By implementing the above technical solution, when the motor drops and contacts the heat dissipation plate, through the arrangement of the elastic grooves, the heat dissipation plate is bent to enhance the protection effect on the motor. Moreover, the elastic grooves and the heat dissipation plate can further improve the heat dissipation performance.

[0013] As a preferred embodiment of the present utility model, front heat dissipation strips are fixedly connected to the surface of the end cover, and rear heat dissipation strips are fixedly connected to the end of the housing.

[0014] By implementing the above technical solution, the front heat dissipation strips and the rear heat dissipation strips can improve the heat dissipation performance of the end cover and the housing.

[0015] As a preferred embodiment of the present utility model, the rotor includes a rotating shaft, a positioning ring is fixedly connected to the inner wall of the housing, a positioning circular groove is formed in the inner wall of the positioning ring, a positioning circular sleeve is fixedly connected in the positioning circular groove, and a first bearing is arranged between the positioning circular sleeve and the rotating shaft.

[0016] By implementing the above technical solution, the arrangement of the first bearing enables the rotating shaft to be more stably rotatably connected to the housing. Through the arrangement of the positioning circular sleeve, the housing is not easily worn, thus greatly extending the service life; since the first bearing is located inside the positioning circular sleeve, the first bearing is not easily damaged.

[0017] As a preferred embodiment of the present utility model, heat dissipation grooves are formed at the end of the housing, and the heat dissipation grooves are close to the positioning ring.

[0018] By implementing the above technical solution, the arrangement of the heat dissipation grooves enables the wall thickness at the end of the housing to become thinner, thereby further improving the heat dissipation performance.

[0019] As a preferred embodiment of the present utility model, a limiting ring is fixedly connected at the opening of the housing body, a limiting groove is formed in the end cover, and the limiting ring is embedded in the limiting groove.

[0020] To implement the above technical solution, align the end cap with the end of the housing, and embed the limiting ring into the limiting groove, so that the end cap is not easily displaced due to vibration, improving the connection stability between the end cap and the housing.

[0021] As a preferred solution of the present utility model, a snap ring is fixedly connected to the side of the end cap facing the first bearing. A clamping groove is formed on the inner wall of the snap ring, and a clamping sleeve is fixedly connected in the clamping groove. A second bearing is arranged between the clamping sleeve and the rotating shaft.

[0022] To implement the above technical solution, through the arrangement of the first bearing and the second bearing, the rotation of the rotating shaft is made more stable, and through the arrangement of the clamping sleeve, the wear resistance between the housing and the second bearing is improved.

[0023] As a preferred solution of the present utility model, a reinforcing groove is formed on the inner wall of the end cap, and a reinforcing ring is arranged on the outer wall of the snap ring. The reinforcing ring is embedded in the reinforcing groove.

[0024] To implement the above technical solution, due to the arrangement of the reinforcing groove, when the rotating shaft rotates at a high speed, the snap ring is not easily displaced.

[0025] As a preferred solution of the present utility model, the housing is made of BMC material.

[0026] To implement the above technical solution, BMC material has the advantages of high strength, heat resistance, chemical resistance, electrical insulation, and dimensional stability. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the external structure of the embodiment;

[0028] Figure 2 It is a schematic diagram showing the position of the wire hole;

[0029] Figure 3 It is a schematic sectional view showing the present utility model.

[0030] Reference Numerals: 11, rotor; 111, rotating shaft; 12, stator; 13, coil; 131, wire coil; 14, housing; 2, heat dissipation part; 31, heat sink; 32, heat dissipation plate; 321, elastic groove; 33, rear heat dissipation strip; 4, positioning ring; 41, positioning circular groove; 42, positioning circular sleeve; 43, first bearing; 51, heat dissipation round hole; 52, heat dissipation groove; 6, end cap; 61, limiting ring; 62, limiting groove; 63, front heat dissipation strip; 7, snap ring; 71, clamping groove; 72, clamping sleeve; 73, second bearing; 81, reinforcing groove; 82, reinforcing ring; 9, wire hole. Detailed Embodiment

[0031] The following further details the specific embodiments of the present utility model in conjunction with the accompanying drawings, so that the technical solutions of the present utility model are easier to understand and master.

[0032] A plastic-encased motor structure includes a rotor 11, a stator 12, a coil 13, a housing 14, and an end cover 6. The coil 13 is wound around the stator 12 to form wire packages 131 at both ends of the stator 12, and the outer diameter of the wire packages 131 is smaller than the outer diameter of the stator 12. A positioning groove is provided on the inner wall of the housing 14 to fix the stator 12 in the positioning groove, and the rotor 11 is rotatably connected to the housing 14 and located inside the stator 12.

[0033] On the outer wall of the housing 14, there are recessed heat dissipation parts 2 provided. There are two heat dissipation parts 2 and both correspond to the coil 13, that is, the two heat dissipation parts 2 are respectively located at both ends of the stator 12. The heat dissipation parts 2 extend to the end of the housing 14.

[0034] On the outer wall of the housing 14, a plurality of heat dissipation fins 31 are fixedly connected. The length direction of the heat dissipation fins 31 is parallel to the axial direction of the housing 14. On the outer wall of the housing 14, a plurality of heat dissipation plates 32 are fixedly connected. The length direction of the heat dissipation plates 32 is parallel to the axial direction of the housing 14. Elastic grooves 321 are provided on the side wall of the heat dissipation plate 32, and two adjacent elastic grooves 321 are arranged oppositely, so that the cross-section of the heat dissipation plate 32 is in an L-shaped arrangement. The thickness of the heat dissipation plate 32 is greater than the thickness of the heat dissipation fin 31, and the height of the heat dissipation plate 32 is greater than the height of the heat dissipation fin 31.

[0035] At the end of the housing 14, a rear heat dissipation strip 33 is fixedly connected, and a plurality of rear heat dissipation strips 33 are evenly distributed along the axis of the housing 14.

[0036] The rotor 11 includes a rotating shaft 111. A positioning ring 4 is fixedly connected to the inner wall of the housing 14, and the positioning ring 4 is coaxially arranged with the housing 14. A positioning circular groove 41 is provided on the inner wall of the positioning ring 4, and the positioning circular groove 41 is coaxially arranged with the positioning ring 4. A positioning circular sleeve 42 is fixedly connected in the positioning circular groove 41. A first bearing 43 is arranged between the positioning circular sleeve 42 and the rotating shaft 111. A first step is provided on the rotating shaft 111 to correspond the first bearing 43 with the first step.

[0037] At the end of the housing 14, a heat dissipation circular hole 51 is provided, and the heat dissipation circular hole 51 is coaxially arranged with the housing 14.

[0038] At the end of the housing 14, a heat dissipation groove 52 is provided, and the heat dissipation groove 52 is close to the positioning ring 4.

[0039] A limiting ring 61 is fixedly connected at the opening of the housing body, and the limiting ring 61 is coaxially arranged with the housing body. A limiting groove 62 is provided on the end cover 6, and the limiting ring 61 is embedded in the limiting groove 62. Then the end cover 6 is fixed to the housing body with bolts.

[0040] A front heat dissipation strip 63 is fixedly connected to the surface of the end cover 6, and a plurality of front heat dissipation strips 63 are distributed along the axis of the end cover 6.

[0041] The rotating shaft 111 of the rotor 11 passes through the end cover 6. A snap ring 7 is fixedly connected to the side of the end cover 6 facing the first bearing 43, and the snap ring 7 is coaxially arranged with the end cover 6. A clamping groove 71 is formed in the inner wall of the snap ring 7, and the clamping groove 71 is coaxially arranged with the snap ring 7. A clamping sleeve 72 is fixedly connected in the clamping groove 71, and a second bearing 73 is arranged between the clamping sleeve 72 and the rotating shaft 111. The rotating shaft 111 passes through the clamping sleeve 72.

[0042] A reinforcing groove 81 is formed in the inner wall of the end cover 6, and the reinforcing groove 81 is coaxially arranged with the end cover 6. A reinforcing ring 82 is arranged on the outer wall of the snap ring 7, and the reinforcing ring 82 is embedded in the reinforcing groove 81.

[0043] Both the outer shell 14 and the end cover 6 are made of BMC material. The stator 12 and the outer shell 14 are fixed together by injection molding.

[0044] A wire hole 9 is formed in the outer shell 14, and the wiring end of the coil 13 is led out from the wire hole 9.

[0045] Of course, the above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A plastic-encased motor structure, comprising a rotor (11), a stator (12), a coil (13), a housing (14), and an end cover (6). The coil (13) is wound around the stator (12) and forms coil packs (131) at both ends of the stator (12). A positioning groove is provided on the inner wall of the housing (14), and the stator (12) is fixed in the positioning groove. The housing (14) is made of plastic. The rotor (11) is rotatably connected to the housing (14) and is located inside the stator (12). The end cover (6) is connected to the housing (14), and the rotor (11) passes through the end cover (6). It is characterized in that: A heat dissipation part (2) which is recessed is formed on the outer wall of the said housing (14), and the heat dissipation part (2) corresponds to the wire coil (131).

2. The structure of a plastic-encapsulated motor according to claim 1, characterized in that: A heat sink (31) is fixedly connected to the outer wall of the said housing (14), and the length direction of the heat sink (31) is parallel to the axial direction of the housing (14).

3. The structure of a plastic-encapsulated motor according to claim 2, characterized in that: A heat dissipation plate (32) is fixedly connected to the outer wall of the said housing (14), the length direction of the heat dissipation plate (32) is parallel to the axial direction of the housing (14), and elastic grooves (321) are formed on the side wall of the heat dissipation plate (32), and two adjacent elastic grooves (321) are arranged oppositely.

4. A plastic-encased motor structure according to claim 1, characterized in that: A front heat dissipation strip (63) is fixedly connected to the surface of the said end cover (6), and a rear heat dissipation strip (33) is fixedly connected to the end of the housing (14).

5. A plastic-encased motor structure according to claim 1, characterized in that: The said rotor (11) includes a rotating shaft (111), a positioning ring (4) is fixedly connected to the inner wall of the housing (14), a positioning circular groove (41) is formed on the inner wall of the positioning ring (4), a positioning circular sleeve (42) is fixedly connected in the positioning circular groove (41), and a first bearing (43) is arranged between the positioning circular sleeve (42) and the rotating shaft (111).

6. The structure of a plastic-encased motor according to claim 5, characterized in that: A heat dissipation groove (52) is formed at the end of the said housing (14), and the heat dissipation groove (52) is close to the positioning ring (4).

7. A plastic-encased motor structure according to claim 5, characterized in that: A limiting ring (61) is fixedly connected at the opening of the said housing (14), a limiting groove (62) is formed on the end cover (6), and the limiting ring (61) is embedded in the limiting groove (62).

8. A plastic-encased motor structure according to claim 7, characterized in that: A snap ring (7) is fixedly connected to the side of the said end cover (6) facing the first bearing (43), a clamping groove (71) is formed on the inner wall of the snap ring (7), a clamping sleeve (72) is fixedly connected in the clamping groove (71), and a second bearing (73) is arranged between the clamping sleeve (72) and the rotating shaft (111).

9. A plastic-encased motor structure according to claim 8, characterized in that: A reinforcing groove (81) is formed on the inner wall of the said end cover (6), a reinforcing ring (82) is arranged on the outer wall of the snap ring (7), and the reinforcing ring (82) is embedded in the reinforcing groove (81).

10. A plastic-encased motor structure according to claim 1, characterized in that: The said housing (14) is made of BMC material.

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