Plastic package motor, air conditioner

Abstract

The application provides a plastic-sealed motor and an air conditioner, and belongs to the field of motor manufacturing. The plastic-sealed motor comprises a motor rotor assembly, a plastic-sealed stator assembly and a first metal end cover. The plastic-sealed stator assembly comprises a second metal end cover, a stator core, an upper insulating framework and a lower insulating framework. The plastic-sealed stator assembly further comprises a first conductive part and a second conductive part. One end of the first conductive part is electrically connected with the second metal end cover, and the other end of the first conductive part is clamped between the upper insulating framework and the stator core. One end of the second conductive part is fixed on the outer circumferential wall of the lower insulating framework and is electrically connected with the first metal end cover, and the other end of the second conductive part is electrically connected with the stator core. The application forms a loop with the rotating shaft, the front bearing, the second metal end cover, the first conductive part, the stator core, the second conductive part, the first metal end cover and the rear bearing of the plastic-sealed motor, effectively prevents the electric corrosion caused by the shaft voltage, has no risk of aging and falling, and can greatly improve the reliability and stability of the electric connection.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor manufacturing, and particularly relates to a plastic-sealed motor and an air conditioner. BACKGROUND

[0002] The existing plastic-sealed motor is insulated between the stator core and the front and rear end covers after the stator is plastic-sealed. The shaft voltage is too high due to high-frequency current and winding imbalance, which causes the bearing raceway oil film to be broken down by the shaft voltage, and the bearing inner and outer rings and the balls to be electrically eroded, thereby seriously affecting the service life of the motor. It is particularly important to design an anti-electric corrosion structure for the plastic-sealed motor. SUMMARY

[0003] Therefore, the present application provides a plastic-sealed motor and an air conditioner, which can solve the technical problem of the existing plastic-sealed motor in the prior art, that is, the stator core is insulated from the front and rear end covers after the stator is plastic-sealed. The shaft voltage is too high due to high-frequency current and winding imbalance, which causes the bearing raceway oil film to be broken down by the shaft voltage, and the bearing inner and outer rings and the balls to be electrically eroded, thereby seriously affecting the service life of the motor.

[0004] In order to solve the above problems, the present application provides a plastic-sealed motor, which comprises a motor rotor assembly, a plastic-sealed stator assembly sleeved outside the motor rotor assembly, and a first metal end cover assembled at one end of the plastic-sealed stator assembly. The plastic-sealed stator assembly comprises a second metal end cover, a stator core, and an upper insulating skeleton and a lower insulating skeleton respectively assembled at both ends of the stator core. The plastic-sealed motor further comprises a first conductive member and a second conductive member. One end of the first conductive member is electrically connected to the second metal end cover, and the other end is clamped between the upper insulating skeleton and the stator core. One end of the second conductive member is fixed to the outer circumferential wall of the lower insulating skeleton and electrically connected to the first metal end cover, and the other end is electrically connected to the stator core.

[0005] In some embodiments, the first conductive member comprises a sleeving part and a first embedding part. The second metal end cover has a hook structure. The sleeving part comprises a large-size frame and a small-size frame. The large-size frame is in communication with the small-size frame. The first embedding part is located on the side of the large-size frame away from the small-size frame. The inner hole size of the large-size frame is not less than the maximum outer edge size of the hook structure. The inner hole size of the small-size frame is less than the maximum outer edge size of the hook structure. The first embedding part is in contact with the stator core.

[0006] In some embodiments, the large-size frame and the small-size frame form a convex shape. The hook structure comprises a first hook body and a second hook body. The hook portions of the first hook body and the second hook body are arranged opposite to each other. The small-size frame is sleeved in the hook portion opening.

[0007] In some embodiments, the second metal end cover comprises a positioning flange, the hook structure is located on a side of the positioning flange away from the stator core, and at an edge of the positioning flange.

[0008] In some embodiments, the upper insulating framework is provided with an embedded hole extending through the axial direction of the upper insulating framework, a wall body of the upper insulating framework matched with one end of the stator core is provided with a radial slot, the first embedded part comprises an axial section matched with the embedded hole and a radial section located in the radial slot, and the thickness of the radial section is greater than the slot depth of the radial slot.

[0009] In some embodiments, the second conductive part comprises a plug-in part and a second embedded part, the outer circumferential wall of the lower insulating framework is provided with a plug-in structure, the plug-in part is plugged into the plug-in structure along the axial direction of the lower insulating framework, and the plug-in part has a conducting body protruding radially outward of the plug-in structure after being plugged into the plug-in structure, and the second embedded part is in contact with the stator core.

[0010] In some embodiments, the plug-in structure comprises a third hook body and a fourth hook body, the hook sections of the third hook body and the fourth hook body are arranged opposite to each other, the plug-in part has a first plug-in body matched with the hook section of the third hook body and a second plug-in body matched with the hook section of the fourth hook body, and the conducting body is connected between the first plug-in body and the second plug-in body.

[0011] In some embodiments, the plug-in structure further comprises a protruding positioning body between the third hook body and the fourth hook body, and the conducting body is plugged into the outer side of the protruding positioning body.

[0012] In some embodiments, a limiting arm is arranged at a position close to the plug-in part on the second embedded part, and the lower insulating framework is provided with a limiting slot, and the end of the limiting arm is located in the limiting slot when the second conductive part is plugged into the plug-in structure.

[0013] In some embodiments, the outer circumferential wall of the stator core is provided with a groove extending along the axial direction thereof, the second embedded part is in the shape of a long strip, and the second embedded part is plugged into the groove along the axial direction of the stator core.

[0014] In some embodiments, the second embedded part is provided with a spot welding hole, and the second embedded part is spot welded with the stator core through the spot welding hole.

[0015] In some embodiments, the outer side of the first metal end cover is connected with a grounding wire.

[0016] The present invention also provides an air conditioner, comprising the above-mentioned plastic-encapsulated motor.

[0017] The present invention provides a plastic-encapsulated motor and air conditioner. Through the arrangement of a first conductive member and a second conductive member, a loop is formed between the rotating shaft, front bearing, second metal end cover, first conductive member, stator core, second conductive member, first metal end cover, and rear bearing of the plastic-encapsulated motor, thereby effectively preventing electrical corrosion caused by shaft voltage. Moreover, the structure is encapsulated in injection molding material, is not exposed to the complex external environment, and has no risk of aging and falling off, thereby greatly improving the reliability and stability of the electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the internal structure of a plastic-encapsulated motor according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Assembly diagram of the plastic-encapsulated motor;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the plastic-sealed stator assembly before plastic sealing;

[0021] Figure 4 Schematic diagram of a first conductive member axially sleeved onto a hook structure of a second metal end cover in an embodiment of the present invention;

[0022] Figure 5 For Figure 4 A schematic diagram of the radially sleeved positioning state of the second metal end cover based on the state shown;

[0023] Figure 6 for Figure 1 A schematic diagram of the three-dimensional structure of the first conductive member;

[0024] Figure 7 for Figure 6 A schematic structural diagram of the first conductive member before assembly;

[0025] Figure 8 for Figure 1 A schematic diagram of the three-dimensional structure of the second metal end cover;

[0026] Figure 9 for Figure 1 Schematic diagram of the local structure of the upper insulating skeleton;

[0027] Figure 10 is a schematic diagram of the state after the first conductive member and the upper insulating frame are assembled;

[0028] Figure 11 for Figure 1 A schematic diagram of the three-dimensional structure of the second conductive member;

[0029] Figure 12 Fig. 1 is a perspective view of a plastic-encapsulated motor according to an embodiment of the present application; Figure 11

[0030] Figure 13 Fig. 4 is a schematic view of a partial structure of a lower insulating framework in Fig. 1; Figure 1

[0031] Figure 14 Fig. 5 is a schematic view of an assembled state of a second conductive member and the lower insulating framework.

[0032] Reference signs are as follows:

[0033] 1, first metal end cover; 11, ground wire; 21, second metal end cover; 211, first hook body; 212, second hook body; 22, stator core; 221, recess; 23, upper insulating framework; 231, embedding hole; 232, radial slot; 24, lower insulating framework; 241, third hook body; 242, fourth hook body; 243, protruding positioning body; 244, limiting slot; 25, stator winding; 3, first conductive member; 31, sleeving part; 311, large-size frame; 312, small-size frame; 32, first embedding part; 321, axial segment; 322, radial segment; 4, second conductive member; 41, inserting part; 411, first inserting body; 412, second inserting body; 413, conductive body; 42, second embedding part; 421, spot welding hole; 43, limiting arm; 100, injection-molded shell; 101, rotating shaft; 102, rotor core assembly; 103, front bearing; 104, rear bearing; 105, motor rotor assembly; 106, plastic-encapsulated stator assembly. DETAILED DESCRIPTION

[0034] With reference to Figures 1 to 14 According to the embodiment of the present application, a plastic-encapsulated motor is provided, with reference to Figure 1 and Figure 2 ​​As shown, the motor rotor assembly 105, the plastic encapsulation stator assembly 106 sleeved on the motor rotor assembly 105, and the first metal end cover 1 assembled to one end of the plastic encapsulation stator assembly 106 are shown, wherein the motor rotor assembly comprises a rotating shaft 101, a rotor core assembly sleeved on the rotating shaft 101, and front and rear bearings 103 and 104 at two ends of the rotor core assembly, the plastic encapsulation stator assembly 106 comprises a second metal end cover 21, a stator core 22, and upper and lower insulating frames 23 and 24 respectively assembled to two ends of the stator core 22, the first and second metal end covers 1 and 21 are respectively provided with bearing chambers to respectively accommodate the front and rear bearings 103 and 104, and the first and second conductive members 3 and 4 are provided, one end of the first conductive member 3 is electrically connected to the second metal end cover 21, the other end is clamped between the upper insulating frame 23 and the stator core 22, one end of the second conductive member 4 is fixed to the outer circumferential wall of the lower insulating frame 24 and is electrically connected to the first metal end cover 1, and the other end is electrically connected to the stator core 22. In the technical scheme, the rotating shaft 101, the front bearing 103, the second metal end cover 21, the first conductive member 3, the stator core 22, the second conductive member 4, the first metal end cover 1, and the rear bearing 104 of the plastic encapsulation motor form a loop through the first and second conductive members 3 and 4, effectively preventing electrical corrosion caused by shaft voltage, and the structure is plastic encapsulated in the injection molding shell 100, does not contact the complex external environment, has no risk of aging and falling off, and can greatly improve the reliability and stability of electrical connection.

[0035] In some embodiments, the first conductive member 3 comprises a sleeving portion 31 and a first embedding portion 32, the second metal end cover 21 is provided with a hook structure (not labeled in the figure), the sleeving portion 31 comprises a large-size frame 311 and a small-size frame 312, the large-size frame 311 communicates with the small-size frame 312, the first embedding portion 32 is located on the side of the large-size frame 311 away from the small-size frame 312, the inner hole size of the large-size frame 311 is not less than the maximum outer edge size of the hook structure, the inner hole size of the small-size frame 312 is less than the maximum outer edge size of the hook structure, and the first embedding portion 32 is in contact with the stator core 22. In this way, the first conductive member 3 and the second metal end cover 21 can be conveniently and reliably connected. See Figure 8 As shown, the large-size frame 311 and the small-size frame 312 form a convex shape, the hook structure comprises first and second hook bodies 211 and 212, the hook portions of the first and second hook bodies 211 and 212 are arranged opposite to each other, and the small-size frame 312 is sleeved in the hook portion openings. In the specific assembly and connection, first, the large-size frame 311 is aligned with the hook structure in the axial direction of the second metal end cover 21. Since the inner hole size of the large-size frame 311 is not less than the maximum outer edge size of the hook structure, the sleeving portion 31 can be easily sleeved on the hook structure, as shown in Figure 4As shown, at this time, the first embedding portion 32 is pulled radially outward, and the small-sized frame 312 moves toward the hook structure. The small-sized frame 312 is finally engaged with the hook openings of the first hook body 211 and the second hook body 212, thereby achieving the engagement of the two. Figure 8 As shown, the second metal end cover 21 includes a positioning flange, and the hook structure is located on the side of the positioning flange away from the stator core 22 and at the edge of the positioning flange, making the electrical connection structure here more compact.

[0036] See also Figure 9 As shown, an embedding hole 231 is constructed on the upper insulating frame 23, and the embedding hole 231 extends through the axial direction of the upper insulating frame 23. A radial groove 232 is constructed on the wall of the upper insulating frame 23 that matches one end of the stator core 22. The first embedding portion 32 includes an axial segment 321 that is embedded and matched with the embedding hole 231 and a radial segment 322 located in the radial groove 232, and the thickness of the radial segment 322 is greater than the groove depth of the radial groove 232, so that the radial segment 322 is more reliably connected to the end face of the stator core 22. After the first conductive member 3 is positioned by the upper insulating frame 23, it forms an electrical connection with the stator core 22, and the connection is more reliable, and the first conductive member 3 is not easy to fall off.

[0037] In a specific embodiment, see Figure 7 and Figure 8 In the convex-shaped sleeve portion 31, the inner hole dimensions of the large frame are AxB, the inner hole dimensions of the small frame are CxD, and the thickness of the sleeve portion 31 is T. The outer edge dimensions of the hook structure of the second metal end cap 21 are axb, the length and width at the base of the hook opening are cxd, and the height of the hook opening is t. AxB is slightly greater than axb, CxD is slightly greater than cxd, and T = t, ensuring effective contact and conduction. The shallow groove at the bottom of the upper insulating frame 23, namely the aforementioned radial groove 232, is less than T in depth. Therefore, when the first conductive member 3 is installed on the upper insulating frame 23, it protrudes from the frame plane. When the upper insulating frame 23 is installed on the stator core 22, the radial segment 322 contacts and conducts with the stator core 22.

[0038] See also Figure 11 and Figure 12As shown, the second conductive member 4 comprises a plug-in portion 41 and a second embedding portion 42, the outer circumferential wall of the lower insulating skeleton 24 has a plug-in structure (not labeled in the figure), the plug-in portion 41 is plugged into the plug-in structure along the axial direction of the lower insulating skeleton 24, and the plug-in portion 41 has a conducting body 413 protruding from the radial outer side of the plug-in structure after being plugged into the plug-in structure, and the second embedding portion 42 is in contact with the stator core 22. Thus, when the first metal end cover 1 is assembled with the injection-molded shell 100 after injection molding, the inner circle of the first metal end cover 1 will be in contact with the conducting body 413 to form a connection. In this technical solution, the second conductive member 4 realizes the electrical connection between the stator core 22 and the first metal end cover 1, and the structure is simple and reliable. Figure 13 As shown, the outer side of the conducting body 413 is a circular arc surface with a radius R, and at this time, the inner circle radius of the first metal end cover 1 is R, and the outer diameter of the injection-molded shell 100 is also R, so as to ensure that the outer side of the conducting body 413 is exposed after the stator is injection molded.

[0039] In some embodiments, the plug-in structure comprises a third hook body 241 and a fourth hook body 242, the hook openings of the third hook body 241 and the fourth hook body 242 are arranged opposite to each other, the plug-in portion 41 has a first plug-in body 411 matching the hook opening of the third hook body 241, a second plug-in body 412 matching the hook opening of the fourth hook body 242, and the conducting body 413 is connected between the first plug-in body 411 and the second plug-in body 412. In a specific embodiment, the first plug-in body 411, the conducting body 413, and the second plug-in body 412 form a structure with a generally broken cross-section in the shape of a U, which ensures that the second conductive member 4 can be reliably connected to the lower insulating skeleton 24. The plug-in structure further comprises a protruding positioning body 243 between the third hook body 241 and the fourth hook body 242, and the conducting body 413 is plugged into the outer side of the protruding positioning body 243. Thus, the connection reliability between the second conductive member 4 and the lower insulating skeleton 24 can be improved.

[0040] The second embedding portion 42 is provided with a limiting arm 43 at a position close to the plug-in portion 41, and the lower insulating skeleton 24 has a limiting groove 244, when the second conductive member 4 is plugged into the plug-in structure, the end of the limiting arm 43 is in the limiting groove 244, and the extension direction of the limiting arm 43 is perpendicular to the extension direction of the second embedding portion 42, thereby realizing the positioning of the axial position of the second conductive member 4. In a specific embodiment, the axial thickness of the limiting arm 43 is not less than the groove depth of the limiting groove 244, so that the limiting arm 43 can protrude from the lower insulating skeleton 24 after assembly.

[0041] The outer circumferential wall of the stator core 22 has a groove 221 extending along the axial direction thereof, and the second embedding portion 42 is long strip-shaped and is inserted into the groove 221 along the axial direction of the stator core 22 to ensure reliable contact between the second embedding portion 42 and the stator core 22. The second embedding portion 42 is provided with a spot welding hole 421, and the second embedding portion 42 is spot-welded with the stator core 22 through the spot welding hole 421. In order to cope with the situation that a large shaft voltage is generated by a high-power motor, the spot welding effectively connects the several-shaped conductive contact pieces and the stator core, thereby ensuring that the anti-electric corrosion does not fail.

[0042] In some embodiments, the outer side of the first metal end cover 1 is connected with a grounding wire 11, the grounding wire 11 is connected with the first metal end cover 1, and the grounding wire 11 is grounded to protect the bearing oil film from being punctured by the shaft voltage and effectively avoid electric corrosion of the bearing.

[0043] According to the embodiments of the present application, an air conditioner is also provided, which comprises the plastic-sealed motor.

[0044] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0045] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be regarded as the protection scope of the present application.

Claims

1. A plastic encapsulated motor characterized by, The application relates to a motor rotor assembly (105), a plastic-sealed stator assembly (106) sleeved outside the motor rotor assembly (105) and a first metal end cover (1) assembled to one end of the plastic-sealed stator assembly (106), wherein the plastic-sealed stator assembly (106) comprises a second metal end cover (21), a stator core (22), an upper insulating framework (23) and a lower insulating framework (24) assembled to two ends of the stator core (22) respectively, a first conductive member (3) and a second conductive member (4), one end of the first conductive member (3) is electrically connected with the second metal end cover (21), the other end is clamped between the upper insulating framework (23) and the stator core (22), one end of the second conductive member (4) is fixed to an outer circumferential wall of the lower insulating framework (24) and is electrically connected with the first metal end cover (1), the other end is electrically connected with the stator core (22); the second conductive member (4) comprises an inserting part (41) and a second embedding part (42), the outer circumferential wall of the lower insulating framework (24) has an inserting structure, the inserting part (41) is inserted into the inserting structure along the axial direction of the lower insulating framework (24), and the inserting part (41) has a conducting body (413) protruding from the radial outer side surface of the inserting structure after being inserted into the inserting structure, the second embedding part (42) is in contact with the stator core (22); the inserting structure comprises a third hook body (241) and a fourth hook body (242), the hook parts of the third hook body (241) and the fourth hook body (242) are oppositely arranged, the inserting part (41) has a first inserting body (411) matched with the hook part opening of the third hook body (241) and a second inserting body (412) matched with the hook part opening of the fourth hook body (242), and the conducting body (413) is connected between the first inserting body (411) and the second inserting body (412); the inserting structure further comprises a protruding positioning body (243), the protruding positioning body (243) is between the third hook body (241) and the fourth hook body (242), and the conducting body (413) is inserted into the outer side of the protruding positioning body (243); the second embedding part (42) is provided with a limiting arm (43) at a position close to the inserting part (41), the lower insulating framework (24) is provided with a limiting groove (244), and when the second conductive member (4) is inserted into the inserting structure, the end of the limiting arm (43) is in the limiting groove (244).

2. The plastic encapsulated motor of claim 1, wherein, The first conductive piece (3) comprises a sleeving part (31) and a first embedding part (32), the second metal end cover (21) has a hook structure, the sleeving part (31) comprises a large-size frame (311) and a small-size frame (312), the large-size frame (311) communicates with the small-size frame (312), the first embedding part (32) is located on the side of the large-size frame (311) away from the small-size frame (312), the inner hole size of the large-size frame (311) is not less than the maximum outer edge size of the hook structure, the inner hole size of the small-size frame (312) is less than the maximum outer edge size of the hook structure, and the first embedding part (32) is in contact with the stator core (22).

3. The plastic encapsulated motor of claim 2, wherein, The large-size frame (311) and the small-size frame (312) form a convex letter shape, the hook structure comprises a first hook body (211) and a second hook body (212), the hook part openings of the first hook body (211) and the second hook body (212) are arranged opposite to each other, and the small-size frame (312) is sleeved in the hook part openings.

4. The plastic encapsulated motor of claim 3, wherein, The second metal end cover (21) comprises a positioning flange, the hook structure is located on the side of the positioning flange away from the stator core (22) and at the edge of the positioning flange.

5. The plastic encapsulated motor of claim 2, wherein, The upper insulation framework (23) is provided with an embedding hole (231) extending through in the axial direction of the upper insulation framework (23), the wall body of the upper insulation framework (23) matched with one end of the stator core (22) is provided with a radial groove (232), the first embedding part (32) comprises an axial section (321) embedded and matched with the embedding hole (231) and a radial section (322) located in the radial groove (232), and the thickness of the radial section (322) is greater than the groove depth of the radial groove (232).

6. The plastic encapsulated motor of claim 1, wherein, The outer circumferential wall of the stator core (22) has a groove (221) extending in the axial direction thereof, the second embedding part (42) is in the shape of a long strip, and the second embedding part (42) is inserted into the groove (221) in the axial direction of the stator core (22).

7. The plastic encapsulated motor of claim 6, wherein, The second embedding part (42) is provided with a spot welding hole (421), and the second embedding part (42) is spot welded between the spot welding hole (421) and the stator core (22).

8. The plastic encapsulated motor of claim 1, wherein, The outer side of the first metal end cover (1) is connected with a grounding wire (11).

9. An air conditioner characterized by comprising: The plastic package motor comprises the plastic package motor according to any one of claims 1 to 8. The plastic package motor comprises the plastic package motor according to any one of claims 1 to 8.

Images