Three-phase plastic-coated structure and electrical equipment

Abstract

The utility model discloses a three-phase plastic-coated structure and an electrical device, and relates to the technical field of power distribution structures, the three-phase plastic-coated structure comprises a plastic member, a three-phase copper bar, a rotary transformer sealing assembly and a fixing member, the plastic member is provided with a first mounting hole and at least three second mounting holes; any phase of copper bar of the three phases of copper bars is arranged in the corresponding second mounting hole; the rotary transformer sealing assembly is detachably arranged in the first mounting hole, the rotary transformer sealing assembly comprises a rotary transformer sealing seat and a rotary transformer wire harness arranged on the rotary transformer sealing seat, and the rotary transformer sealing seat and the hole wall of the first mounting hole are arranged in a sealing mode; the fixing part is connected with the plastic part and the rotary transformer sealing seat so as to fix the rotary transformer sealing seat on the plastic part; according to the technical scheme provided by the utility model, the cost of the plastic coating structure can be reduced, the assembly and maintenance efficiency can be improved, the installation reliability can be indirectly improved, and the service life of equipment can be indirectly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of power distribution structure technology, and in particular to a three-phase plastic-coated structure and electrical equipment. Background Technology

[0002] In electrical control systems, three-phase plastic-coated components play many roles, such as supporting three-phase high-power copper busbars and isolating external motors and internal components of the control box. The resolver, as a signal transmission cable connecting the motor, needs to be connected to the external motor through a resolver sealing plug to ensure the airtightness of the control box.

[0003] In existing technologies, three-phase plastic-coated components are usually placed separately from the resolver and sealing plug, which makes installation inconvenient. Moreover, existing plastic-coated components can only provide auxiliary positioning for the installation of the resolver sealing plug, but cannot provide sufficient fixation. This is because assembling the resolver increases the processing steps of the control box and the installation steps for workers. Using metal sheets and screws to install the resolver also increases costs and has adverse effects such as vibration and aging. At the same time, it greatly reduces the utilization rate of the box space. Utility Model Content

[0004] The main purpose of this utility model is to propose a three-phase plastic-coated structure and electrical equipment, which aims to solve the problems of inconvenient installation caused by the separate installation of the existing three-phase plastic-coated parts and the resolver line, as well as the increased cost of installing the resolver line using metal sheets and screws, which leads to a reduction in the space utilization of the electrical control box.

[0005] To achieve the above objectives, this utility model proposes a three-phase plastic-coated structure, comprising:

[0006] A plastic part, wherein the plastic part is provided with a first mounting hole and at least three spaced-apart second mounting holes;

[0007] Three-phase copper busbar, wherein each phase of the three-phase copper busbar is correspondingly disposed in each of the second mounting holes;

[0008] A resolver sealing assembly is detachably disposed in the first mounting hole. The resolver sealing assembly includes a resolver sealing seat and a resolver wire harness disposed on the resolver sealing seat. The resolver sealing seat is sealed to the wall of the first mounting hole.

[0009] A fastener connects the plastic part and the resolver seal seat to fix the resolver seal seat onto the plastic part.

[0010] In one embodiment, the plastic part is provided with a first limiting part, the rotary seal seat is provided with a second limiting part, and the fixing member is engaged between the first limiting part and the second limiting part.

[0011] In one embodiment, the resolver seal includes an abutment section, a transition section, and a limiting section connected in sequence. The transition section is offset from the abutment section and forms a stepped surface. Part of the limiting section protrudes outside the transition section, and part of the limiting section and the stepped surface enclose a second limiting portion that is concave.

[0012] In one embodiment, the first limiting portion protrudes from one side of the plastic part and is close to the outer periphery of the first mounting hole. The first limiting portion includes a first limiting segment and a second limiting segment. The second limiting segment is located on the side of the first limiting segment away from the plastic part. The second limiting segment extends toward the first mounting hole. The second limiting segment, the first limiting segment, and the plastic part together form a limiting groove.

[0013] The rotary seal seat is recessed inward on the side facing the first limiting portion to form the second limiting portion.

[0014] In one embodiment, the second limiting portion is provided on each of the opposite sides of the resolver sealing seat;

[0015] The first mounting hole has a first limiting part on each side corresponding to the second limiting part, and each first limiting part corresponds to each second limiting part to form a slot.

[0016] In one embodiment, the fastener includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The first connecting segment, the second connecting segment, and the third connecting segment form a U-shaped structure with an opening on one side. The first connecting segment and the third connecting segment are respectively engaged in slots on opposite sides of the rotary seal seat.

[0017] In one embodiment, the first connecting segment and / or the third connecting segment are provided with a fastening segment on the side away from the opening of the U-shaped structure, and the fastening segment is located at the end of the first connecting segment and / or the third connecting segment away from the second connecting segment.

[0018] In one embodiment, the resolver seal seat is a flexible component, and a protruding ring is provided on the outer peripheral side of the resolver seal seat. The protruding ring is used for interference fit with the wall of the first mounting hole.

[0019] In one embodiment, there are multiple convex rings, which are spaced apart along the extension direction of the resolver harness.

[0020] This utility model also proposes an electrical device, comprising:

[0021] Box; and

[0022] The three-phase plastic-coated structure described in the above embodiments is disposed inside the housing.

[0023] The technical solution of this utility model makes it easier to install the three-phase plastic-coated parts and the resolver sealing assembly into electrical equipment by detachably mounting the resolver sealing assembly on the plastic part. The resolver sealing assembly is positioned and installed on the plastic part by fixing parts. Since traditional metal sheets and screws are not used, it can not only reduce costs, but also improve assembly and maintenance efficiency, and indirectly improve the reliability of installation and the service life of equipment. Attached Figure Description

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of an embodiment of the three-phase plastic-coated structure provided by this utility model;

[0026] Figure 2 for Figure 1 Enlarged structural diagram of point A in the three-phase plastic-coated structure;

[0027] Figure 3 for Figure 1 Schematic diagram of the exploded disintegration structure of a three-phase plastic-coated structure;

[0028] Figure 4 for Figure 2 A schematic diagram of the structure of the resolver seal seat;

[0029] Figure 5 for Figure 2 A schematic diagram of the fastener structure in the diagram;

[0030] Figure 6 A schematic diagram of the three-phase plastic-coated structure provided by this utility model installed in the enclosure;

[0031] Figure 7 for Figure 6 A structural diagram from another perspective.

[0032] Description of Figure Numbers:

[0033] 100. Plastic-coated structure; 10. Plastic part; 11. First mounting hole; 12. Second mounting hole; 13. First limiting part; 131. First limiting section; 132. Second limiting section; 20. Three-phase copper busbar; 30. Resolver sealing assembly; 31. Resolver sealing seat; 311. Abutting section; 3111. Protruding ring; 312. Transition section; 313. Extension section; 32. Resolver wiring harness; 33. Second limiting part; 40. Fixing member; 41. First connecting section; 42. Second connecting section; 43. Third connecting section; 44. Snap-fit ​​section;

[0034] 210. Box body.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] In existing technologies, three-phase plastic-coated components are usually placed separately from the resolver and sealing plug, which makes installation inconvenient. Moreover, existing plastic-coated components can only provide auxiliary positioning for the installation of the resolver sealing plug, but cannot provide sufficient fixation. This is because assembling the resolver increases the processing steps of the control box and the installation steps for workers. Using metal sheets and screws to install the resolver also increases costs and has adverse effects such as vibration and aging. At the same time, it greatly reduces the utilization rate of the box space.

[0040] This utility model proposes a three-phase plastic-coated structure 100.

[0041] Please see Figures 1 to 5 In one embodiment of this utility model, the three-phase plastic-coated structure 100 includes a plastic part 10, a three-phase copper busbar 20, a resolver sealing assembly 30, and a fixing member 40. The plastic part 10 has a first mounting hole 11 and at least three spaced-apart second mounting holes 12. Each phase of the three-phase copper busbar 20 is correspondingly located in each of the second mounting holes 12. The resolver sealing assembly 30 is detachably disposed in the first mounting hole 11. The resolver sealing assembly 30 includes a resolver sealing seat 31 and a resolver wire harness 32 disposed on the resolver sealing seat 31. The resolver sealing seat 31 is sealed to the wall of the first mounting hole 11. The fixing member 40 connects the plastic part 10 and the resolver sealing seat 31 to fix the resolver sealing seat 31 to the plastic part 10.

[0042] The three-phase plastic-coated structure 100 in this utility model includes a plastic part 10, which is formed by plastic injection molding. In this embodiment, the plastic part 10 has a first mounting hole 11 and a plurality of spaced second mounting holes 12. The first mounting hole 11 is used for assembling and disassembling the resolver assembly, while the plurality of second mounting holes 12 are mainly used for positioning and installing the three-phase copper busbar 20. In this embodiment, the resolver sealing assembly 30 includes a resolver sealing seat 31 and a resolver wire harness 32. The resolver wire harness 32 passes through the resolver sealing seat 31. The resolver sealing seat 31 has a plurality of through holes for multiple resolver wire harnesses 32 to pass through. Each through hole and each resolver wire harness 32 are closely spaced. In this embodiment, when the resolver sealing assembly 30 is installed on the plastic part 10, the resolver sealing seat 31 can be inserted into the first mounting hole 11. To ensure a sealing connection between the resolver sealing seat 31 and the hole wall of the first mounting hole 11, the size of the resolver sealing seat 31 can be designed to be slightly larger than the opening of the first mounting hole 11, so that when the resolver sealing seat 31 is inserted into the first mounting hole 11, it can have an interference fit with the hole wall of the first mounting hole 11, thereby achieving a sealing connection. To further prevent the resolver sealing seat 31 from detaching from the first mounting hole 11 after being inserted into it, a fixing member 40 is also provided in this embodiment. The fixing member 40 is detachably connected to the plastic part 10, and the fixing member... 40 is also detachably connected to the resolver seal seat 31. The plastic part 10 and the resolver seal seat 31 are indirectly connected through the fixing member 40. Because the fixing member 40 connects the plastic part 10 and the resolver seal seat 31 respectively, it can effectively prevent the resolver seal seat 31 from detaching from the first mounting hole 11. This allows the resolver seal seat 31 to be securely inserted into the first mounting hole 11 of the plastic part 10 through the fixing member 40. In this embodiment, the fixing member 40 is connected to both the plastic part 10 and the resolver seal seat 31 by a plug-in connection. In other embodiments, a snap-fit ​​connection or a combination of plug-in and snap-fit ​​connections can also be used. There are no further limitations on this. In this embodiment, the resolver seal assembly... The resolver sealing assembly 30 is detachably mounted on the plastic part 10. When installing the plastic part 10 with the three-phase copper busbar 20 and the resolver sealing assembly 30 into the electrical control box of the electrical equipment, the resolver sealing assembly 30 can be pre-installed on the plastic part 10, and then the plastic part 10 can be installed into the electrical control box. This makes it more convenient to install the three-phase plastic-coated part and the resolver sealing assembly 30 into the electrical control box. The resolver sealing assembly 30 is positioned and installed on the plastic part 10 by the fixing part 40. Since traditional metal sheets and screws are not used, it can not only reduce costs, but also improve assembly and maintenance efficiency, and indirectly improve the reliability of installation and the service life of the equipment.

[0043] Regarding the connection method between the three-phase copper busbar 20 and the plastic part 10, the three-phase copper busbar 20 can be integrally cast with the plastic part 10 during injection molding, or the plastic part 10 can be pre-formed with multiple second mounting holes 12 during injection molding, and the three-phase copper busbar 20 can be installed in the second mounting holes 12 by disassembly later. No further restrictions are imposed on this.

[0044] Regarding the sealing arrangement between the resolver sealing seat 31 and the wall of the first mounting hole 11, in other embodiments, a sealing element can be sleeved on the outer periphery of the resolver sealing seat 31 to seal the gap between the resolver sealing seat 31 and the first mounting hole 11. Of course, after inserting the resolver sealing seat 31 into the first mounting hole 11, the gap between the resolver sealing seat 31 and the first mounting hole 11 can also be sealed by filling. This is not limited.

[0045] In one embodiment, such as Figure 2 and Figure 3 As shown, the plastic part 10 is provided with a first limiting part 13, the rotary seal seat 31 is provided with a second limiting part 33, and the fixing member 40 is engaged between the first limiting part 13 and the second limiting part 33. In this embodiment, a first limiting portion 13 is provided on one side surface of the plastic part 10, and a second limiting portion 33 is provided on the resolver seal seat 31 opposite to the first limiting portion 13. The fixing member 40 is engaged between the first limiting portion 13 and the second limiting portion 33. For ease of explanation, the following description uses the example of the first limiting portion 13 and the second limiting portion 33 being opposite to and corresponding to each other. The first limiting portion 13 and the second limiting portion 33 are located on the same side of the plastic part 10, and the first limiting portion 13 has a limiting structure protruding or recessed on the side facing the second limiting portion 33, while the second limiting portion 33 also has a limiting structure protruding or recessed on the side facing the first limiting portion 13. The fixing member 40 has limiting portions on both sides opposite to the first limiting portion 13 and the second limiting portion 33. The 3-adaptive snap-fit ​​structure is not limited in much. Since the fixing part 40 is connected to the first limiting part 13 and the second limiting part 33 provided on the resolver sealing seat 31 respectively, the resolver sealing seat 31 cannot move arbitrarily along the extension direction of the resolver harness 32. If the resolver sealing seat 31 moves along the extension direction of the resolver harness 32, it will be unable to move because the fixing part 40 and the first limiting part 13 are also snap-fitted. This arrangement makes the resolver sealing seat 31 more stably inserted into the first mounting hole 11 of the plastic part 10. In other embodiments, the opening of the first limiting part 13 and the second limiting part 33 can be staggered. The specific setting position of the first limiting part 13 and the second limiting part 33 is not limited in much.

[0046] In one embodiment, such as Figure 4As shown, the resolver sealing seat 31 includes an abutment section 311, a transition section 312 and a limiting section connected in sequence. The transition section 312 is misaligned with the abutment section 311 and forms a stepped surface. Part of the limiting section protrudes outside the transition section 312, and part of the limiting section and the stepped surface enclose a second limiting part 33 that is concave. In this embodiment, the resolver sealing seat 31 includes an abutment section 311, a transition section 312, and a limiting section connected thereto. The abutment section 311 is at least partially inserted into the first mounting hole 11, while the transition section 312 may be partially located within the first mounting hole 11 or completely located outside the first mounting hole 11. The transition section 312 and the abutment section 311 are offset from each other along the extension direction of the resolver harness 32 to form a stepped surface. A portion of the limiting section protrudes beyond the transition section 312, and the portion of the limiting section protruding beyond the transition section 312 and the stepped surface enclose a concave second limiting portion 33. The second limiting portion 33 is used for the fastener 40 to be inserted or snapped into place. In this embodiment, the abutment section 311, the transition section 312, and the limiting section may be integrally formed or assembled later by a detachable method, without much limitation on this.

[0047] In another embodiment, such as Figure 2 and Figure 3As shown, the first limiting part 13 protrudes from one side of the plastic part 10 and is close to the outer periphery of the first mounting hole 11. The first limiting part 13 includes a first limiting segment 131 and a second limiting segment 132. The second limiting segment 132 is located on the side of the first limiting segment 131 away from the plastic part 10. The second limiting segment 132 extends toward the first mounting hole 11. The second limiting segment 132, the first limiting segment 131 and the plastic part 10 surround each other to form a limiting groove. The rotary seal seat 31 is recessed inward on the side facing the first limiting part 13 to form the second limiting part 33. In this embodiment, the first limiting portion 13 protrudes from one side of the plastic part 10 and is disposed near the outer periphery of the first mounting hole 11 opened in the plastic part 10. In this embodiment, the first limiting portion 13 includes a first limiting segment 131 and a second limiting segment 132. The first limiting segment 131 protrudes from one side surface of the plastic part 10, while the second limiting segment 132 is disposed on the side of the first limiting segment 131 away from the plastic part 10, and extends towards the first mounting hole 11. In this embodiment, the second limiting segment 132, the first limiting segment 131, and the plastic part 10 together form a limiting groove. The groove opening faces the first mounting hole 11; and the resolver seal seat 31 is recessed inward on the side facing the first limiting part 13 to form a second limiting part 33. The limiting groove is correspondingly provided with the recessed second limiting part 33, and the fixing member 40 is locked between the limiting groove and the second limiting part 33. A part of the fixing member 40 is locked in the limiting groove, and the other part is locked in the second limiting part 33. In this way, the limiting groove can cooperate with the fixing member 40 to prevent the resolver seal seat 31 from moving forward or backward along the opening direction of the first mounting hole 11, so that the resolver seal seat 31 can be stably positioned and installed on the plastic part 10 without using fasteners such as metal sheets and screws.

[0048] In one embodiment, such as Figures 1 to 4As shown, the resolver sealing seat 31 has second limiting portions 33 on opposite sides; the first mounting hole 11 has first limiting portions 13 on opposite sides corresponding to the second limiting portions 33, and each first limiting portion 13 corresponds to each second limiting portion 33 to form a slot. In this embodiment, second limiting portions 33 are provided on opposite sides of the resolver sealing seat 31, and first limiting portions 13 are provided on one side of the plastic part 10, respectively corresponding to the second limiting portions 33. Each first limiting portion 13 and each second limiting portion 33 are provided correspondingly, and the corresponding first limiting portions 13 and second limiting portions 33 form a slot, which is used for the fastener 40 to be snapped or inserted. In this embodiment, the specific structure of the first limiting portion 13 and the second limiting portion 33 can refer to the structure of any of the above embodiments, and no further limitations are made. The number of first limiting portions 13 and second limiting portions 33 is not specifically limited.

[0049] Specifically, such as Figure 5 As shown, the fastener 40 includes a first connecting segment 41, a second connecting segment 42, and a third connecting segment 43 connected in sequence. The first connecting segment 41, the second connecting segment 42, and the third connecting segment 43 form a U-shaped structure with an opening on one side. The first connecting segment 41 and the third connecting segment 43 are respectively engaged in the slots on opposite sides of the rotary seal seat 31. In this embodiment, the fastener 40 includes a first connecting segment 41, a second connecting segment 42, and a third connecting segment 43 connected in sequence. The first connecting segment 41, the second connecting segment 42, and the third connecting segment 43 enclose a U-shaped structure that opens to one side. The first connecting segment 41 and the third connecting segment 43 are located on both sides of the second connecting segment 42, and the second connecting segment 42 forms the bottom of the U-shaped structure. In order to enable the fastener 40 to better engage with the first limiting part 13 and the second limiting part 33 located on different sides of the rotary seal seat 31 in the above embodiment, the fastener 40 is set as a U-shaped structure in this embodiment. The fastener 40 is more convenient to install and its structural strength is also improved accordingly.

[0050] More specifically, the first connecting segment 41 and / or the third connecting segment 43 are provided with a fastening segment 44 on the side away from the opening of the U-shaped structure, and the fastening segment 44 is provided at the end of the first connecting segment 41 and / or the third connecting segment 43 away from the second connecting segment 42. To prevent the U-shaped structure from detaching from the first limiting part 13 and the second limiting part 33 on both sides of the resolver seal seat 31 due to gravity or external force, in this embodiment, for ease of explanation, it is taken as an example that both the first connecting section 41 and the third connecting section 43 are provided with a fastening section 44. The fastening section 44 is provided on the side of the first connecting section 41 and the third connecting section 43 away from the second connecting section 42, and the fastening section 44 extends in the direction away from the cavity formed by the U-shaped structure. That is, the fastening section 44 protrudes from the outer wall of the first connecting section 41, forming a fastening part in sequence. When the first connecting section 41 and the third connecting section 43 pass through the slot formed by the first limiting part 13 and the second limiting part 33, the fastening part will restrict the U-shaped structure from detaching from the slot. In this embodiment, the surface of the fastening section 44 away from the second connecting section 42 is inclined, and the thickness of the fastening section 44 gradually decreases in the direction away from the cavity of the U-shaped structure.

[0051] In one embodiment, the resolver seal seat 31 is a flexible component, and a protruding ring 3111 is provided on the outer periphery of the resolver seal seat 31. The protruding ring 3111 is used for an interference fit with the wall of the first mounting hole 11. In this embodiment, the resolver seal seat 31 is a flexible component, that is, it is made of materials such as rubber, silicone, or plastic. In this embodiment, a protruding ring 3111 is provided on the outer periphery of the resolver seal seat 31. The protruding ring 3111 protrudes from the outer periphery of the resolver seal seat 31. When the resolver seal seat 31 is inserted into the first mounting hole 11, since the protruding ring 3111 protrudes from the outer periphery of the resolver seal seat 31, the protruding ring 3111 can make the resolver seal seat 31 and the first mounting hole 11 form an interference fit, thereby achieving a sealing effect. The protruding ring 3111 can be formed by protruding part of the outer periphery of the resolver seal seat 31, or it can be formed by a later sleeve method. There are no further limitations on this.

[0052] Specifically, such as Figure 4 As shown, there are multiple convex rings 3111, which are spaced apart along the extension direction of the resolver harness 32. In this embodiment, multiple convex rings 3111 are provided, which are spaced apart along the extension direction of the resolver harness 32. The arrangement of multiple convex rings 3111 not only makes it easier to insert the resolver seal seat 31 into the first mounting hole 11, but also effectively increases the interference fit effect between the resolver seal seat 31 and the first mounting hole 11.

[0053] This utility model also proposes an electrical device, which includes a housing 200 and a three-phase plastic-coated structure 100. The specific structure of the three-phase plastic-coated structure 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The three-phase plastic-coated structure 100 is disposed within the housing 200. In this embodiment, as... Figure 6 and Figure 7 As shown, the outer periphery of the plastic part 10 has a plurality of protruding lugs, and fastening holes are provided on the lugs. When the plastic part 10 is installed into the housing 200, a sealing element can be installed between the plastic part 10 and the housing 200, and then fasteners are used to pass through the fastening holes to fix the plastic part 10 into the housing 200. In this embodiment, the electrical equipment can be a motor or a motor controller, and there are no further limitations on this.

[0054] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A three-phase plastic-coated structure, characterized in that, include: A plastic part, wherein the plastic part is provided with a first mounting hole and at least three spaced-apart second mounting holes, and the plastic part is provided with a first limiting part; Three-phase copper busbar, wherein each phase of the three-phase copper busbar is correspondingly disposed in each of the second mounting holes; A resolver sealing assembly is detachably disposed in the first mounting hole. The resolver sealing assembly includes a resolver sealing seat and a resolver wire harness disposed on the resolver sealing seat. The resolver sealing seat is sealed to the wall of the first mounting hole. The resolver sealing seat is provided with a second limiting part. A fixing member is provided, which is engaged between the first limiting part and the second limiting part. The fixing member connects the plastic part and the resolver sealing seat to fix the resolver sealing seat on the plastic part.

2. The three-phase plastic-coated structure as described in claim 1, characterized in that, The rotary seal includes an abutting section, a transition section, and a limiting section connected in sequence. The transition section is offset from the abutting section and forms a stepped surface. Part of the limiting section protrudes outside the transition section, and part of the limiting section and the stepped surface enclose a second limiting part that is concave.

3. The three-phase plastic-coated structure as described in claim 1, characterized in that, The first limiting part protrudes from one side of the plastic part and is close to the outer periphery of the first mounting hole. The first limiting part includes a first limiting segment and a second limiting segment. The second limiting segment is located on the side of the first limiting segment away from the plastic part. The second limiting segment extends toward the first mounting hole. The second limiting segment, the first limiting segment and the plastic part surround each other to form a limiting groove. The rotary seal seat is recessed inward on the side facing the first limiting portion to form the second limiting portion.

4. The three-phase plastic-coated structure as described in claim 1, characterized in that, The second limiting part is provided on each of the opposite sides of the resolver sealing seat; The first mounting hole has a first limiting part on each side corresponding to the second limiting part, and each first limiting part corresponds to each second limiting part to form a slot.

5. The three-phase plastic-coated structure as described in claim 4, characterized in that, The fastener includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The first connecting segment, the second connecting segment, and the third connecting segment form a U-shaped structure with an opening on one side. The first connecting segment and the third connecting segment are respectively engaged in slots on opposite sides of the rotary seal seat.

6. The three-phase plastic-coated structure as described in claim 5, characterized in that, The first connecting segment and / or the third connecting segment are provided with a fastening segment on the side away from the opening of the U-shaped structure, and the fastening segment is located at the end of the first connecting segment and / or the third connecting segment away from the second connecting segment.

7. The three-phase plastic-coated structure as described in any one of claims 1 to 6, characterized in that, The resolver seal seat is a flexible component, and a convex ring is provided on the outer periphery of the resolver seal seat. The convex ring is used to make an interference fit with the wall of the first mounting hole.

8. The three-phase plastic-coated structure as described in claim 7, characterized in that, The number of convex rings is multiple, and the multiple convex rings are spaced apart along the extension direction of the resolver bundle.

9. An electrical device, characterized in that, include: Box; as well as The three-phase plastic-coated structure as described in any one of claims 1 to 8, wherein the three-phase plastic-coated structure is disposed within the housing.

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