Insulation structure of stator assembly, motor and compressor

Abstract

The invention relates to the technical field of motors, in particular to an insulation structure of a stator assembly, a motor with the insulation structure and a compressor with the motor. The insulation structure comprises a slot insulator and an insulation support, the stator winding is wound on the slot insulator and the insulation support to be insulated and isolated from the stator core, and at least one end, penetrating through a main body part of a stator slot, of the slot insulator extends out of the stator slot and is folded towards the outer side of the stator slot to form a main folding part. The main body part and the main folding part are bent and extend towards the center of the stator iron core along the radial direction of the stator iron core at a stator notch of the stator groove to form a notch extension part, a winding groove which is butted and communicated with the end part of the stator groove is formed in the insulating bracket, and a winding notch is formed in the winding groove corresponding to the stator notch; and the insulating bracket is provided with a bearing part for bearing the main folding part along the edges of the winding groove and the winding groove opening. The number of end windings can be reduced while the required creepage distance is ensured, and a weak point at a stator notch is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an insulation structure of a stator assembly, a motor having the insulation structure, and a compressor having the motor. Background Art

[0002] In the prior art, the stator assembly of the variable frequency motor for the compressor usually uses slot insulation and insulation brackets to insulate the stator winding from the stator core. Figures 1 to 4 As shown, the stator assembly of a conventional motor for a compressor includes a stator core 100, a stator winding 200, a slot insulator 01 and an insulating bracket 02. The stator core 100 is annular, and a plurality of stator teeth 101 are radially extended on the inner circumference. Each stator tooth 101 is evenly spaced along the circumference, and a stator slot 102 is formed between adjacent stator teeth 101 to accommodate the stator winding 200 wound on the stator teeth 101. Each coil of the stator winding 200 is formed by winding a stator tooth 101 with an outer layer of insulating wire (such as enameled wire). The slot insulator 01 is arranged in the stator slot 102, and the insulating bracket 02 is arranged at both ends of the stator core 100 in the axial direction. The stator winding 200 is wound on the slot insulator 01 and the insulating bracket 02, so that the stator winding 200 and the stator core 100 are insulated and isolated by the slot insulator 01 and the insulating bracket 02. The insulating bracket 02 is usually provided with a bracket pin 020, which is used to limit and fix the slot insulation 01 to prevent the slot insulation 01 from moving in multiple directions. From the working principle of this type of radial motor, it can be known that the long sides of the rectangular coils of the stator winding 200 located in the stator slots 102 of the stator core 100 are effective sides, and the end windings 201 wires located at both ends of the stator core 100 are only used for connection and have no function of electromechanical energy conversion. Therefore, reducing the end windings 201 as much as possible can reduce the amount of copper used in the wires and reduce costs; at the same time, reducing the end windings 201 can also reduce the coil resistance of the stator winding 200 and improve the efficiency of the motor.

[0003] On the other hand, when the motor is working, there will be a certain voltage between the stator winding 200 and the stator core 100. When the voltage is too high or the insulation is poor, the stator winding 200 and the stator core 100 will be broken down, and then leakage will occur (the stator core 100 is energized), which may cause motor failure at the least and threaten personal safety at the worst. Because of safety regulations, creepage distance and electrical clearance are specified in various standards. When the materials meet the requirements, the specified creepage distance and electrical clearance must be achieved to ensure electrical safety. Creepage distance refers to the shortest path between two conductive parts or between a conductive part and the protective interface of the equipment measured along the insulating surface. See Figure 3, a stator assembly of a conventional motor, a slot insulator 01 passes through a stator core 100 and an insulating bracket 02, the insulating bracket 02 has an outer baffle 021 connected to the ring of the stator core 100 and a plurality of winding portions 022 connected to the stator teeth 101 in a one-to-one correspondence, a winding slot 023 connected to the end of the stator slot 102 is formed between adjacent winding portions 022, and the slot insulator 01 passes through the winding slot 023. See Figure 4 The creepage distance is the height H of the portion of the slot insulation 01 extending out of the stator slot 102 of the stator core 100 extending axially along the stator core 100, which is the minimum distance between the conductive stator winding 200 and the stator core 100 along the insulating material. In order to ensure electrical safety, the creepage distance H has a minimum value requirement, and the creepage distance H changes synchronously with the axial thickness L of the winding portion 022. Therefore, the axial thickness L of the winding portion 022 is also designed to have a minimum value requirement. This means that the axial length of the end winding 201 cannot be too short, and a longer end winding 201 will increase the coil resistance of the stator winding 200, resulting in a decrease in motor efficiency, while increasing the amount of copper used in the wire and increasing costs.

[0004] In order to reduce the end winding 201 to reduce copper loss while ensuring the creepage distance, the improved solution in the prior art is as follows: Figure 5 As shown, in a certain motor scheme, the axial height of the stator core 100 is a certain value, the tooth yoke parts (the circular ring of the stator core 100 and the stator teeth 101) at both ends of the stator core 100 are narrowed, and at the same time, the tooth yoke part (the outer baffle 021 and the winding part 022) of the insulating bracket 02 is recessed toward the corresponding part of one end surface of the stator core 100, so that the recessed part of the insulating bracket 02 is plugged into and matched with the narrowed part of the stator core 100, thereby reducing the axial thickness L of the winding part 022 while keeping the creepage distance H unchanged, and also reducing the length of the part of the slot insulation 01 extending out of the stator slot 102 of the stator core 100 along the axial direction of the stator core 100, so that the axial length of the end winding 201 can be reduced, thereby reducing the copper consumption and the coil resistance. However, this solution narrows the tooth yoke parts at both ends of the stator core 100, which will bring two problems: first, the magnetic circuit at both ends of the stator core 100 becomes narrower, the magnetic density saturation of the stator core 100 increases, the iron loss increases, and the motor efficiency decreases; second, the two ends of the stator core 100 are different in size from the middle, which leads to an increase in the complexity of the punching mold, complex lamination, and increased processing costs. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an insulation structure of a stator assembly, which can reduce the end windings while ensuring the required creepage distance and avoid the stator slot becoming a weak point.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides an insulation structure of a stator assembly, comprising a slot insulation and an insulation bracket, wherein the slot insulation is arranged in a stator slot of a stator core, the insulation bracket is arranged on both ends of the stator core, the stator winding is wound on the slot insulation and the insulation bracket and is insulated and isolated from the stator core, the slot insulation has a main body portion penetrating the stator slot, at least one end of the main body portion protrudes from the stator slot and extends with a main folding portion, the main folding portion is formed by folding the end of the main body portion toward the outside of the stator slot, the main body portion and the main folding portion are bent and extended toward the center of the stator core along the radial direction of the stator core at the stator slot opening of the stator slot to form a slot extension portion, the insulation bracket is formed with a winding slot corresponding to and penetrating the end of the stator slot, the winding slot is formed with a winding slot opening corresponding to the stator slot opening, and the insulation bracket is provided with a bearing portion receiving the main folding portion along the edges of the winding slot and the winding slot opening.

[0008] Preferably, the bearing portion bends and extends toward the center of the insulating support along the radial direction of the insulating support at the winding notch.

[0009] Preferably, the main folded portion is formed by folding the end of the main body portion toward the outside of the stator slot by 90°-180°.

[0010] Preferably, the insulating support includes an annular outer baffle, a plurality of winding parts arranged on the inner circumferential side of the outer baffle at intervals along the circumferential direction, and an inner baffle provided on each winding part, a winding groove is formed between adjacent winding parts, a bearing part is provided on the winding part, the inner baffle and the outer baffle facing the side of the winding part, and a main folding part is provided on the groove insulation corresponding to the bearing part.

[0011] Preferably, the winding portion has a tooth middle portion located between adjacent bearing portions, and the tooth middle portion and the bearing portion are located on the same plane or protrudes relative to the bearing portion.

[0012] Preferably, at least one auxiliary folding portion is extended from the free end of the main folding portion away from the main body, the auxiliary folding portion is formed by folding the free end of the main folding portion toward the outside of the stator slot, and the bearing portion also receives the auxiliary folding portion.

[0013] Preferably, the secondary folded portion is formed by folding the free end of the main folded portion toward the outside of the stator slot by 90°-180°.

[0014] Preferably, a groove opening toward the insulating bracket is formed between the main folded portion and the main body portion.

[0015] Preferably, a side edge of the bearing portion close to the winding slot is provided with a flange along the profile line of the stator slot and the stator slot opening, and the flange is embedded in the groove.

[0016] The present invention also provides a motor, comprising the insulation structure of the stator assembly as described above.

[0017] The present invention also provides a compressor, comprising the motor as described above.

[0018] Compared with the prior art, the present invention has significant improvements:

[0019] The present invention forms a main folding part by folding the end of the slot insulation, and designs a bearing part on the insulation bracket to cooperate with and receive the main folding part, so that the creepage distance between the stator winding and the stator core includes the transverse length of the main folding part extending along the tangent direction of the stator core along the bearing part, which can achieve the effect of extending the creepage distance, and reduce the length of the part of the slot insulation extending out of the stator core stator slot along the axial direction of the stator core while ensuring the required creepage distance, thereby reducing the axial length of the end winding of the stator winding, reducing the end winding, reducing the amount of copper used in the wire, reducing the cost, reducing the resistance of the stator winding coil, and improving the motor efficiency. At the same time, the folding of the end of the slot insulation can increase the ability of the end of the slot insulation to resist deformation, and avoid the slot insulation being rolled into the insulating wire during the stator winding process, resulting in poor insulation caused by the insulating wire contacting the stator core. Furthermore, by bending and extending the main body and the main folding portion of the slot insulation toward the center of the stator core at the stator slot opening of the stator slot to form a slot extension portion, at the same time, the bearing portion of the insulating bracket is also bent and extended toward the center of the insulating bracket at the winding slot opening to cooperate with the portion of the main folding portion that forms the slot extension portion, it is possible to ensure that the creepage distance of the stator slot opening is extended, and form a coherent overall creepage path at the stator slot edge line and the stator slot opening, so that there is no weak point in the creepage distance on the overall creepage path, thereby avoiding the creepage distance of the stator slot opening being too short to affect the overall creepage distance, ensuring a good overall creepage distance extension effect, and not occupying the area inside the stator slot, which can reduce costs, improve motor efficiency, and reduce slot fill rate.

[0020] When both ends of the slot insulation are folded over and cooperate with the bearing parts of the insulating brackets on the two ends of the stator core, the slot insulation and the insulating bracket can be limited and fixed. A stable structure can be formed by assembling the slot insulation and the insulating bracket on the stator core. Therefore, it is no longer necessary to add bracket pins to the insulating bracket to limit and fix the slot insulation, thereby increasing the windable area of ​​the stator winding, that is, increasing the slot area of ​​the stator slot, which can increase the wire diameter, reduce resistance, reduce resistance loss, and improve motor efficiency; at the same time, without changing the original winding, the slot fill rate can be reduced, the paint film loss caused by the excessively high slot fill rate can be improved, the manufacturability can be improved, and the product yield can be increased; while ensuring the same slot fill rate, an insulated wire with a larger wire diameter can be used to reduce resistance and improve motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a conventional stator assembly in the prior art, in which stator winding coils are not shown in some stator slots.

[0022] Figure 2 It is a half-section schematic diagram of a conventional subassembly in the prior art.

[0023] Figure 3 It is a partial cross-sectional schematic diagram of a conventional stator assembly in the prior art without the stator winding.

[0024] Figure 4 The present invention is a partial cross-sectional schematic diagram of a conventional stator assembly at an end of a stator tooth of a stator core in the prior art.

[0025] Figure 5 It is a partial cross-sectional schematic diagram of an improved stator assembly in the prior art at the end of a stator tooth of a stator core.

[0026] Figure 6 It is a partial cross-sectional schematic diagram of the assembly of the insulation structure and the stator core of the stator assembly according to the first embodiment of the present invention.

[0027] Figure 7 yes Figure 6 Enlarged schematic diagram of part A in the middle.

[0028] Figure 8 It is a structural schematic diagram of an insulating bracket in the insulating structure of the stator assembly of the first embodiment of the present invention.

[0029] Fig. 9 It is a partial cross-sectional schematic diagram of the stator assembly at the end of a stator tooth of the stator core according to the first embodiment of the present invention.

[0030] Fig.10 It is a partial cross-sectional schematic diagram of the assembly of the insulation structure and the stator core of the stator assembly according to the second embodiment of the present invention.

[0031] Fig.11 yes Fig.10 Enlarged schematic diagram of part B in the middle.

[0032] Fig.12 It is a structural schematic diagram of an insulating bracket in the insulating structure of the stator assembly of the second embodiment of the present invention.

[0033] Fig.13 It is a partial cross-sectional schematic diagram of a stator assembly at an end of a stator tooth of a stator core according to the second embodiment of the present invention.

[0034] Fig.14 It is a partial cross-sectional schematic diagram of the stator assembly of the third embodiment of the present invention at the end of a stator tooth of the stator core.

[0035] Fig.15 It is a partial cross-sectional schematic diagram of the assembly of the insulation structure and the stator core of the stator assembly according to the fourth embodiment of the present invention.

[0036] Fig.16 yes Fig.15Enlarged schematic diagram of part C in the middle.

[0037] Fig.17 It is a structural schematic diagram of an insulating bracket in the insulating structure of the stator assembly of the fourth embodiment of the present invention.

[0038] Fig.18 It is a partial cross-sectional schematic diagram of a stator assembly at an end of a stator tooth of a stator core according to a fourth embodiment of the present invention.

[0039] Fig.19 It is a partial cross-sectional schematic diagram of the assembly of the insulation structure and the stator core of the stator assembly of the fifth embodiment of the present invention.

[0040] Fig. 20 yes Fig.19 Enlarged schematic diagram of part D in the middle.

[0041] Fig.21 It is a structural schematic diagram of an insulating bracket in the insulating structure of the stator assembly of the fifth embodiment of the present invention.

[0042] Fig. 22 It is a partial cross-sectional schematic diagram of the stator assembly of the fifth embodiment of the present invention at the end of a stator tooth of the stator core.

[0043] The reference numerals are described as follows:

[0044] 100 stator core

[0045] 101 stator teeth

[0046] 102 stator slots

[0047] 103 stator pole shoe

[0048] 104 stator slot

[0049] 200 Stator winding

[0050] 201 End winding

[0051] 01 Slot insulation

[0052] 02 Insulation bracket

[0053] 020 Bracket pin

[0054] 021 External baffle

[0055] 022 Winding Department

[0056] 023 Winding slot

[0057] 1 slot insulation

[0058] 10 Grooves

[0059] 11 Main body

[0060] 12 Main folding part

[0061] 13. Secondary folding part

[0062] 14 Slot extension

[0063] 2 Insulation bracket

[0064] 21 Outer baffle

[0065] 22 Winding section

[0066] 220 Inner baffle

[0067] 221 tooth center

[0068] 23 Winding slot

[0069] 231 Winding notch

[0070] 24 Load-bearing part

[0071] 25 Flanging DETAILED DESCRIPTION

[0072] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0073] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0076] Embodiment 1

[0077] like Figures 6 to 9 As shown, it is the first embodiment of the insulation structure of the stator assembly provided by the present invention. In this embodiment 1, the stator assembly includes a stator core 100 and a stator winding 200. The stator core 100 is annular, and a plurality of stator teeth 101 are radially extended on the inner circumference of the stator core 100. Each stator tooth 101 is evenly spaced along the circumferential direction. Each stator tooth 101 is provided with a stator pole shoe 103. Stator slots 102 are formed between adjacent stator teeth 101. The stator slots 102 have stator notches 104. The stator notches 104 are located between adjacent stator pole shoes 103. The stator slots 102 are used to accommodate the stator winding 200 wound on the stator teeth 101. Each coil of the stator winding 200 is formed by winding an outer layer of insulated wire (such as enameled wire) on a stator tooth 101.

[0078] See also Figure 6 and Figure 7 The insulation structure of the stator assembly of the first embodiment includes a slot insulation 1 and an insulation bracket 2. The slot insulation 1 is arranged in the stator slot 102 of the stator core 100, and the insulation bracket 2 is arranged at both ends of the stator core 100, and the two ends of the stator core 100 refer to the two ends of the stator core 100 along the axial direction. The stator winding 200 is wound on the slot insulation 1 and the insulation bracket 2 and is insulated and isolated from the stator core 100, that is, the slot insulation 1 and the insulation bracket 2 insulate and isolate the stator winding 200 and the stator core 100. The slot insulation 1 passes through the stator slots 102 of the stator core 100 and the insulating support 2. The insulating support 2 has an outer baffle 21 connected to the circular ring of the stator core 1, a plurality of winding parts 22 connected to the stator teeth 101 one by one, and an inner baffle 220 provided on each winding part 22. The inner baffle 220 is provided corresponding to the stator pole shoe 103. The outer baffle 21 is annular. The plurality of winding parts 22 are provided on the inner circumferential side surface of the outer baffle 21 at intervals along the circumferential direction. A winding slot 23 is formed between adjacent winding parts 22. The winding slot 23 is connected to and penetrates the end of the stator slot 102. In addition, the winding slot 23 is formed with a winding slot opening 231 corresponding to the stator slot opening 104 of the stator slot 102. The winding slot opening 231 is located between adjacent inner baffles 220. The slot insulation 1 penetrates the stator slots 102 and the winding slots 23 , and the stator winding 200 is wound on the slot insulation 1 and the insulation bracket 2 through the stator slots 102 and the winding slots 23 , so that the stator winding 200 and the stator core 100 are insulated and isolated by the slot insulation 1 and the insulation bracket 2 .

[0079] In this embodiment 1, see Figures 6 to 9The slot insulator 1 has a main body 11 that penetrates the stator slot 102. At least one end of the main body 11 extends out of the stator slot 102 and extends with a main folding portion 12. The main folding portion 12 is formed by folding the end of the main body 11 toward the outside of the stator slot 102. At the same time, the main body 11 and the main folding portion 12 of the slot insulator 1 are bent and extended along the radial direction of the stator core 100 toward the center of the stator core 100 at the stator slot 104 of the stator slot 102 to form a slot extension portion 14, so that the slot insulator 1 also forms an opening at the stator slot 104. The opening is formed by two slot extension portions 14 extending from two opposite side walls of the stator slot 104 and spaced apart from each other. The insulating bracket 2 is provided with a bearing portion 24 along the edges of the winding slot 23 and the winding slot 231. The bearing portion 24 receives the main folding portion 12, that is, the main folding portion 12 is placed on the bearing portion 24 of the insulating bracket 2. The bearing part 24 on the insulating support 2 is arranged along the edge of the winding slot 231. Preferably, the bearing part 24 arranged along the edge of the winding slot 23 continues to bend and extend toward the center of the insulating support 2 along the radial direction of the insulating support 2 (parallel to the radial direction of the stator core 100) at the winding slot 231, so as to match and receive the part of the main folding part 12 forming the slot extension part 14. The part of the main folding part 12 forming the slot extension part 14 is placed on the part of the bearing part 24 bent and extended at the winding slot 231, and is attached to the surface of the inner baffle 220 of the insulating support 2 facing the winding slot 231. Therefore, the creepage distance between the stator winding 200 and the stator core 100 is the distance creeping along the bearing part 24 and the main folding part 12.

[0080] The insulation structure of the stator assembly of the first embodiment is achieved by folding the end of the slot insulation 1 to form a main folded portion 12, and designing a bearing portion 24 on the insulation bracket 2 to cooperate with and receive the main folded portion 12, so that the creepage distance between the stator winding 200 and the stator core 100 includes the lateral length of the main folded portion 12 extending along the bearing portion 24 along the tangent direction of the stator core 100, thereby achieving the effect of extending the creepage distance, and achieving the reduction of the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial direction of the stator core 100 while ensuring the required creepage distance, thereby reducing the axial length of the end winding of the stator winding 200, achieving the reduction of the end winding, reducing the amount of copper used in the wire, reducing the cost, reducing the coil resistance of the stator winding 200, and improving the motor efficiency. At the same time, the folded end of the slot insulation 1 can increase the ability of the end of the slot insulation 1 to resist deformation, thereby preventing the slot insulation 1 from being drawn into the insulating wire during the winding process of the stator winding 200, resulting in poor insulation due to the contact between the insulating wire and the stator core 100.

[0081] By means of the supporting portion 24 arranged along the edge of the winding slot 23 and the matching structure of the corresponding main folded portion 12 , a longer creepage distance can be formed along most of the profile line of the stator slot 102 , but the stator slot opening 104 is prone to become a weak point. In the first embodiment, the main body 11 and the main folding portion 12 of the slot insulation 1 are bent and extended toward the center of the stator core 100 at the stator slot 104 of the stator slot 102 to form a slot extension portion 14. At the same time, the bearing portion 24 of the insulating bracket 2 is also bent and extended toward the center of the insulating bracket 2 at the winding slot 231 to cooperate with the portion of the main folding portion 12 that forms the slot extension portion 14, thereby ensuring that the creepage distance of the stator slot 104 is extended, and forming a coherent overall creepage path at the stator slot 102 edge line and the stator slot 104, so that there is no weak point in the creepage distance on the overall creepage path, thereby avoiding the creepage distance of the stator slot 104 being too short to affect the overall creepage distance, ensuring a good overall creepage distance extension effect, and not occupying the area inside the stator slot 102, which can reduce costs, improve motor efficiency, and reduce slot fill rate.

[0082] In the first embodiment, preferably, the main folded portion 12 is formed by folding the end of the main body 11 toward the outside of the stator slot 102 by 90°-180°. Preferably, the main folded portion 12 is formed by folding the end of the main body 11 toward the outside of the stator slot 102 by 150°-180°. Here, taking the end of the main body 11 of the slot insulation 1 folded toward the outside of the stator slot 102 by 180° to form the main folded portion 12 as an example, see Fig. 9 The creepage distance between the stator winding 200 and the stator core 100 is mainly the sum of the axial length H1 of the main body 11 of the slot insulation 1 extending out of the stator slot 102 along the axial direction of the stator core 100 along the bearing portion 24, the lateral length H2 of the main folded portion 12 extending along the tangential direction of the stator core 100 along the bearing portion 24, and the axial length H3 of the main folded portion 12 extending along the axial direction of the stator core 100, plus the creepage distance formed by the slot extension portion 14 of the slot insulation 1 at the stator slot 104. Among them, the creepage path composed of H1+H2+H3 is a step-shaped bending type. This creepage path is different from the linear creepage path along the axial direction of the stator core 100 in the prior art (such as Figure 4 and Figure 5Compared with the creepage distance H shown in , under the condition of equal creepage distance value, the step-shaped bending type creepage path includes a transverse length H2 extending tangentially along the stator core 100, so its axial length H1+H3 extending axially along the stator core 100 is smaller than the axial length H of the linear creepage path in the prior art extending axially along the stator core 100, that is, the axial length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the stator core 100 is reduced, thereby reducing the axial length of the end winding of the stator winding 200, thereby achieving the purpose of reducing the end winding. When the main folded portion 12 is folded toward the outside of the stator slot 102 at an angle greater than 90° and less than 180° and extends obliquely, the creepage path between the stator winding 200 and the stator core 100 also includes a transverse length H2 extending tangentially along the stator core 100, and H3 in the creepage distance is replaced by the extension length of the main folded portion 12 along its oblique direction and is relatively longer. Therefore, the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial extension of the stator core 100 can also be reduced, thereby reducing the axial length of the end winding of the stator winding 200 and achieving the purpose of reducing the end winding. When the main folded portion 12 is folded at an angle of 90° toward the outside of the stator slot 102, the creepage path between the stator winding 200 and the stator core 100 also includes a transverse length H2 extending tangentially along the stator core 100, thereby also reducing the axial length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the stator core 100, thereby reducing the axial length of the end winding of the stator winding 200, thereby achieving the purpose of reducing the end winding.

[0083] The insulation structure of the stator assembly of the first embodiment of the present invention can limit and fix the slot insulation 1 and the insulation bracket 2 when both ends of the slot insulation 1 are folded and cooperate with the bearing parts 24 of the insulation bracket 2 on both ends of the stator core 100. A stable structure can be formed by assembling the slot insulation 1 and the insulation bracket 2 on the stator core 100. Therefore, it is no longer necessary to add bracket pins to the insulation bracket 2 to limit and fix the slot insulation 1, thereby increasing the winding area of ​​the stator winding 200, that is, increasing the slot area of ​​the stator slot 102, increasing the wire diameter, reducing resistance, reducing resistance loss, and improving motor efficiency; at the same time, without changing the original winding, the slot fill rate can be reduced, the paint film loss caused by the excessively high slot fill rate can be improved, the manufacturability can be improved, and the product yield can be improved; while ensuring that the slot fill rate is the same, an insulating wire with a larger wire diameter can be used to reduce resistance and improve motor efficiency.

[0084] In the first embodiment, on the insulating bracket 2, at least the winding portion 22 and the inner baffle 220 are provided with a bearing portion 24, that is, the bearing portion 24 is at least located at the edge of the winding portion 22 and the inner baffle 220 close to the winding slot 23, and the slot insulation 1 is provided with a main folding portion 12 corresponding to the bearing portion 24, that is, the main body 11 of the slot insulation 1 at least corresponds to the bearing portion 24 on the winding portion 22 and the inner baffle 220 and is folded toward the outside of the stator slot 102 to form the main folding portion 12.

[0085] Furthermore, a bearing portion 24 is also provided on the side of the outer baffle plate 21 facing the winding portion 22, that is, a portion of the bearing portion 24 is located at the edge of the winding portion 22 and the inner baffle plate 220 close to the winding groove 23, and another portion is located at the edge of the outer baffle plate 21 close to the winding groove 23, and a main folding portion 12 is provided corresponding to the bearing portion 24 of the slot insulation 1, that is, the main body 11 of the slot insulation 1 corresponds to the bearing portion 24 on the outer baffle plate 21, the winding portion 22 and the inner baffle plate 220, and is folded toward the outside of the stator slot 102 to form the main folding portion 12.

[0086] Since the bearing portion 24 on the insulating bracket 2 is arranged along the edge of the winding groove 23, adjacent bearing portions 24 are formed at the edges of adjacent winding grooves 23. The winding portion 22 of the insulating bracket 2 is located between adjacent winding grooves 23 and has a tooth middle portion 221 located between adjacent bearing portions 24. In the first embodiment, the tooth middle portion 221 of the winding portion 22 and the bearing portion 24 are located on the same plane, so that the axial thickness L′ of the winding portion 22 can be reduced as much as possible, thereby reducing the weight of the insulating bracket 2, reducing the material consumption of the insulating bracket 2, and appropriately reducing the cost of the insulating bracket 2.

[0087] In the first embodiment, preferably, the main folded portion 12 of the slot insulation 1 is spaced from the main body 11 to form a groove 10 opening toward the insulation support 2. At this time, the main folded portion 12 is folded toward the outside of the stator slot 102 at an angle greater than 90° to form the groove 10 opening toward the insulation support 2. The spacing between the main folded portion 12 and the main body 11 is conducive to increasing the transverse length H2 of the main folded portion 12 extending along the bearing portion 24 along the tangent direction of the stator core 100, thereby extending the creepage distance.

[0088] Embodiment 2

[0089] like Figures 10 to 13 , which is a second embodiment of the insulation structure of the stator assembly provided by the present invention. The second embodiment is basically the same as the first embodiment, and the similarities are not repeated here, except that, in the second embodiment, the middle portion 221 of the tooth of the winding portion 22 of the insulating bracket 2 protrudes relative to the bearing portion 24, that is, the middle portion 221 of the tooth of the winding portion 22 extends along the axial direction of the stator core 100 and protrudes from the bearing portion 24, thereby forming steps with the bearing portions 24 on both sides.

[0090] In the second embodiment, by protruding the middle portion 221 of the tooth of the winding portion 22, the strength of the insulating bracket 2 can be increased without affecting the reduction of the axial length of the end winding of the stator winding 200, and the possibility of deformation of the insulating bracket 2 during assembly can be reduced, thereby improving manufacturability and reducing production costs. At the same time, the middle portion 221 of the tooth is protruding to form steps with the bearing portions 24 on both sides, which can play a positioning role in placing the main folded portion 12 of the slot insulation 1 on the bearing portion 24.

[0091] Embodiment 3

[0092] like Fig.14 As shown, it is the third embodiment of the insulation structure of the stator assembly provided by the present invention. Embodiment 3 is basically the same as Embodiment 2, and the similarities are not repeated here. The difference is that in this embodiment 3, the main folding portion 12 of the slot insulation 1 is further extended with at least one auxiliary folding portion 13 away from the free end of the main body 11, and the auxiliary folding portion 13 is formed by folding the free end of the main folding portion 12 toward the outside of the stator slot 102, and the free end of the main folding portion 12, that is, the extension path of the main folding portion 12 is away from the end of the main body 11, and the bearing portion 24 on the insulating bracket 2 also receives the auxiliary folding portion 13, that is, the main folding portion 12 and the auxiliary folding portion 13 extending from the free end are both placed on the bearing portion 24 on the insulating bracket 2. Therefore, the creepage distance between the stator winding 200 and the stator core 100 is mainly the distance of creeping along the bearing portion 24, the main folding portion 12 and the auxiliary folding portion 13. By adding the secondary folding portion 13, the lateral length of the creepage distance extending along the tangent direction of the stator core 100 along the bearing portion 24 is increased, thereby further extending the creepage distance, and the axial length of the creepage distance extending along the axial direction of the stator core 100 can be further reduced. Under the condition of ensuring the required creepage distance, the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial direction of the stator core 100 is further reduced, thereby further reducing the axial length of the end winding of the stator winding 200.

[0093] In the third embodiment, preferably, the auxiliary folding portion 13 is formed by folding the free end of the main folding portion 12 toward the outer side of the stator slot 102 by 90°-180°. More preferably, the auxiliary folding portion 13 is formed by folding the free end of the main folding portion 12 toward the outer side of the stator slot 102 by 150°-180°. In which, taking the example that the end of the main body 11 of the slot insulation 1 is folded 180° toward the outside of the stator slot 102 to form the main folded portion 12, and the free end of the main folded portion 12 is folded 180° toward the outside of the stator slot 102 to form the auxiliary folded portion 13, the creepage distance between the stator winding 200 and the stator core 100 is mainly the sum of the axial length H1 of the main body 11 of the slot insulation 1 extending out of the stator slot 102 along the axial direction of the stator core 100 along the bearing portion 24, the lateral length H2′ of the main folded portion 12 and all the main folded portions 12 extending along the tangential direction of the stator core 100 along the bearing portion 24, and the axial length H3′ of the auxiliary folded portion 13 extending along the axial direction of the stator core 100, plus the creepage distance formed by the slot extension portion 14 of the slot insulation 1 at the stator slot 104. In which, the creepage path formed by H1+H2′+H3′ is also a step-shaped bending type. The axial length H3′ of the auxiliary folding portion 13 extending in the axial direction of the stator core 100 is preferably equal to the axial length H3 of the main folding portion 12 extending in the axial direction of the stator core 100. By adding the auxiliary folding portion 13, the transverse length extending along the bearing portion 24 along the tangent direction of the stator core 100 in the creepage distance is increased, that is, H2′>H2, so that the creepage distance can be further extended, and the axial length extending in the axial direction of the stator core 100 in the creepage distance can also be further reduced. When the angle at which the secondary folding portion 13 is folded toward the outside of the stator slot 102 is greater than 90° and less than 180° and extends obliquely, the creepage path between the stator winding 200 and the stator core 100 also includes a transverse length H2′ extending tangentially along the stator core 100, and H3′ in the creepage distance is relatively longer due to the extension length of the secondary folding portion 13 along its oblique direction. Therefore, the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial extension of the stator core 100 can be further reduced, thereby further reducing the axial length of the end winding of the stator winding 200. When the angle at which the secondary folding portion 13 is folded toward the outside of the stator slot 102 is 90°, the creepage path between the stator winding 200 and the stator core 100 also includes a transverse length H2′ extending tangentially along the stator core 100, thereby further reducing the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial direction of the stator core 100, thereby further reducing the axial length of the end winding of the stator winding 200.

[0094] In the third embodiment, preferably, there is a spacing space between the secondary folding portion 13 and the main folding portion 12, and / or there is a spacing space between adjacent secondary folding portions 13, which is beneficial to increase the lateral length of the secondary folding portion 13 extending along the bearing portion 24 along the tangent direction of the stator core 100, thereby extending the creepage distance.

[0095] In the third embodiment, the number of auxiliary folding portions 13 is not limited, and one or more auxiliary folding portions 13 may be provided. When multiple auxiliary folding portions 13 are provided, each two adjacent auxiliary folding portions 13 are formed by folding the extended end (free end) of one auxiliary folding portion 13 toward the outer side of the stator slot 102 to form another auxiliary folding portion 13.

[0096] Fig.14 It is shown that the middle portion 221 of the tooth of the winding portion 22 of the insulating bracket 2 is protruding relative to the bearing portion 24, but the third embodiment is not limited to this. The middle portion 221 of the tooth of the winding portion 22 and the bearing portion 24 as described in the first embodiment above may also be located on the same plane.

[0097] Embodiment 4

[0098] like Figures 15 to 18As shown, it is a fourth embodiment of the insulation structure of the stator assembly provided by the present invention. The fourth embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that in the fourth embodiment, the edge of one side of the bearing portion 24 on the insulating bracket 2 close to the winding slot 23 is provided with a flange 25 along the profile line of the stator slot 102 and the stator slot opening 104, and the winding slot 23 and the winding slot opening 231 formed between the adjacent winding portions 22 of the insulating bracket 2 are surrounded by the flange 25 on the edge of the bearing portion 24, and the flange 25 is embedded in the groove 10 between the main folding portion 12 and the main body 11 of the slot insulation 1. In this way, the creepage distance between the stator winding 200 and the stator core 100 is mainly the sum of the axial length H1′ of the main body 11 of the slot insulation 1 extending out of the stator slot 102 along the axial direction of the stator core 100 along the flange 25 of the load-bearing portion 24, the lateral length H2a of the main folded portion 12 extending along the tangential direction of the stator core 100 along the flange 25 of the load-bearing portion 24, the axial length H3a of the main folded portion 12 extending along the axial direction of the stator core 100 along the flange 25 of the load-bearing portion 24, the lateral length H2b of the main folded portion 12 extending along the tangential direction of the stator core 100 along the portion other than the flange 25 of the load-bearing portion 24, and the axial length H3 of the main folded portion 12 extending along the axial direction of the stator core 100, plus the creepage distance formed by the slot extension portion 14 of the slot insulation 1 at the stator slot 104. The creepage path formed by H1′+H2a+H3a+H2b+H3 is an “N”-shaped bending type. The sum of the transverse length H2a of the main folded portion 12 extending along the flange 25 of the bearing portion 24 along the tangent direction of the stator core 100 and the transverse length H2b of the main folded portion 12 extending along the tangent direction of the stator core 100 along the portion other than the flange 25 of the bearing portion 24 is the transverse length H2 of the main folded portion 12 extending along the tangent direction of the stator core 100 along the bearing portion 24, that is, H2a+H2b=H2. The axial length H1′ of the portion of the main body 11 extending out of the stator slot 102 along the axial direction of the stator core 100 along the flange 25 of the bearing portion 24 is increased, that is, H1′>H1. The axial length H3a of the main folded portion 12 extending along the flange 25 of the bearing portion 24 along the axial direction of the stator core 100 is also increased. That is, through the design of the "N"-shaped bent creepage path, multiple axial lengths extending along the axial direction of the stator core 100 are formed in the creepage distance, which can further extend the creepage distance, and can also further reduce the maximum value of a single axial length extending along the axial direction of the stator core 100 in the creepage distance. Under the condition of ensuring the required creepage distance, the length of the portion of the slot insulation 1 extending out of the stator slot 102 of the stator core 100 along the axial direction of the stator core 100 is further reduced, thereby further reducing the axial length of the end winding of the stator winding 200.At the same time, the flange 25 on the edge of the bearing portion 24 of the insulating bracket 2 is engaged with the groove 10 between the main folded portion 12 and the main body 11 of the slot insulation 1, which can limit the freedom of the insulating bracket 2 and the slot insulation 1 in all directions to form a more stable structure.

[0099] Figures 15 to 18 It is shown that the main body 11 of the slot insulation 1 is extended with a main folded portion 12, but the fourth embodiment is not limited thereto, and at least one auxiliary folded portion 13 may also be extended from the free end of the main folded portion 12 as described in the third embodiment.

[0100] Embodiment 5

[0101] like Figures 19 to 22 As shown, it is the fifth embodiment of the insulation structure of the stator assembly provided by the present invention. The fifth embodiment is basically the same as the fourth embodiment, and the similarities are not repeated here. The difference is that in the fifth embodiment, the middle part 221 of the tooth of the winding part 22 of the insulating bracket 2 as described in the second embodiment is raised relative to the bearing part 24 to increase the strength of the insulating bracket 2, reduce the possibility of deformation of the insulating bracket 2 during assembly, improve manufacturability, reduce production costs, and at the same time play a positioning role in placing the main folding part 12 (or, the main folding part 12 and the auxiliary folding part 13) of the slot insulation 1 on the bearing part 24.

[0102] Embodiment 6

[0103] Based on the above-mentioned embodiments 1 to 5, embodiment 6 provides a sixth embodiment of the insulation structure of the stator assembly of the present invention. In this embodiment 6, both ends of the main body 11 of the slot insulation 1 extend out of the stator slot 102 of the stator core 100 and extend with a main folding portion 12. The slot insulation 1 is fixed on the stator core 100 and the insulation support 2 by cooperating with the bearing portion 24 of the insulation support 2 on both ends of the stator core 100 through the main folding portions 12 at both ends. The structure of any end of the main body 11 of the slot insulation 1 and the structure of the insulation support 2 cooperating therewith can adopt any one of the cooperating structures of the slot insulation 1 end and the insulation support 2 described in the above-mentioned embodiments 1 to 5; the cooperating structures of the slot insulation 1 end and the insulation support 2 at both ends of the stator core 100 can be the same or different.

[0104] By folding both ends of the slot insulation 1 and cooperating with the bearing parts 24 of the insulating bracket 2 on both ends of the stator core 100, the slot insulation 1 and the insulating bracket 2 can be limited and fixed. A stable structure can be formed by assembling the slot insulation 1 and the insulating bracket 2 on the stator core 100. Therefore, it is no longer necessary to add bracket pins to the insulating bracket 2 to limit and fix the slot insulation 1, thereby increasing the winding area of ​​the stator winding 200, that is, increasing the slot area of ​​the stator slot 102, which can increase the wire diameter, reduce resistance, reduce resistance loss, and improve motor efficiency; at the same time, without changing the original winding, the slot fill rate can be reduced, the paint film loss caused by the excessively high slot fill rate can be improved, the manufacturability can be improved, and the product yield can be improved; while ensuring that the slot fill rate is the same, an insulated wire with a larger wire diameter can be used to reduce resistance and improve motor efficiency.

[0105] In a first preferred embodiment, one end of the stator core 100 adopts a matching structure of the slot insulation 1 end and the insulating bracket 2 as described in any one of the above-mentioned embodiments 1 to 3, that is, a matching structure without a nested flange 25, and the other end of the stator core 100 adopts a matching structure of the slot insulation 1 end and the insulating bracket 2 as described in the above-mentioned embodiment 4 or 5, that is, a matching structure with a nested flange 25. During assembly, the two types of insulating brackets 2 with and without flanges 25 are first assembled to the two ends of the stator core 100 respectively, and then one end of the slot insulation 1 is squeezed and shrunk by utilizing the elastic characteristics of the main folding portion 12 (or the main folding portion 12 and the auxiliary folding portion 13) of the slot insulation 1, and then inserted into the stator slot 102 from the stator slot 102 of the stator core 100 close to the end of the insulating bracket 2 with the flange 25, until the main body 11 of the slot insulation 1 is completely inserted into the stator slot 102, and the other end of the slot insulation 1 is engaged with the insulating bracket 2 with the flange 25. After the squeezed end of the slot insulation 1 extends out of the other end of the stator slot 102, it elastically recovers and naturally cooperates with the insulating bracket 2 without the flange 25, so that the slot insulation 1, the insulating brackets 2 at both ends and the stator core 100 form a stable structure with good assembly performance.

[0106] In the second preferred embodiment, both ends of the stator core 100 adopt the matching structure of the slot insulation 1 end and the insulating bracket 2 as described in the fourth or fifth embodiment, that is, both ends of the stator core 100 adopt the matching structure with the flange 25 nested. In this way, the axial length of the end winding of the stator winding 200 can be further reduced, thereby further reducing the amount of copper used, with better economy and efficiency. In order to increase assembly, the slot insulation 1 can be divided into two sections from the middle, and the two sections of slot insulation 1 are respectively inserted into the stator slot 102 from the two ends of the stator slot 102 of the stator core 100, so that the ends of the two sections of slot insulation 1 are respectively engaged with the insulating bracket 2 with the flange 25 at the two ends of the stator core 100.

[0107] Embodiment 7

[0108] Based on the insulation structure of the stator assembly of the present invention, the seventh embodiment of the present invention further provides a motor. The motor of the seventh embodiment includes any one of the insulation structures of the stator assembly described in the first to sixth embodiments above.

[0109] Embodiment 8

[0110] Based on the motor of the present invention, the eighth embodiment of the present invention further provides a compressor. The compressor of the eighth embodiment includes the motor as described in the seventh embodiment above.

[0111] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An insulation structure of a stator assembly, comprising a slot insulation (1) and an insulation bracket (2), wherein the slot insulation (1) is arranged in a stator slot (102) of a stator core (100), the insulation bracket (2) is arranged at both ends of the stator core (100), and a stator winding (200) is wound on the slot insulation (1) and the insulation bracket (2) to be insulated and isolated from the stator core (100), characterized in that: The slot insulator (1) comprises a main body (11) penetrating the stator slot (102); at least one end of the main body (11) protrudes from the stator slot (102) and extends to have a main folded portion (12); the main folded portion (12) is formed by folding the end of the main body (11) toward the outside of the stator slot (102); the main body (11) and the main folded portion (12) are arranged at the stator slot opening (104) of the stator slot (102) along the stator core (100). The stator core (100) is bent and extended in a radial direction toward the center of the stator core (100) to form a slot extension portion (14); the insulating support (2) is formed with a winding slot (23) that is connected to and penetrates the end of the stator slot (102); the winding slot (23) is formed with a winding slot (231) corresponding to the stator slot (104); and the insulating support (2) is provided with a bearing portion (24) that receives the main folded portion (12) along the edges of the winding slot (23) and the winding slot (231).

2. The insulation structure of the stator assembly according to claim 1, characterized in that: The bearing portion (24) bends and extends toward the center of the insulating support (2) along the radial direction of the insulating support (2) at the winding notch (231).

3. The insulation structure of the stator assembly according to claim 1, characterized in that: The main folded portion (12) is formed by folding the end of the main body portion (11) toward the outside of the stator slot (102) by 90°-180°.

4. The insulation structure of the stator assembly according to claim 1, characterized in that: The insulating support (2) comprises an annular outer baffle (21), a plurality of winding portions (22) arranged at intervals along the circumferential direction on the inner circumferential side surface of the outer baffle (21), and an inner baffle (220) provided on each of the winding portions (22); the winding groove (23) is formed between adjacent winding portions (22); the bearing portion (24) is provided on one side of the winding portion (22), the inner baffle (220) and the outer baffle (21) facing the winding portion (22); and the slot insulation (1) is provided with the main folding portion (12) corresponding to the bearing portion (24).

5. The insulation structure of the stator assembly according to claim 4, characterized in that: The winding portion (22) has a tooth middle portion (221) located between adjacent bearing portions (24); the tooth middle portion (221) and the bearing portion (24) are located on the same plane or protrude relative to the bearing portion (24).

6. The insulation structure of the stator assembly according to claim 1, characterized in that: At least one secondary folding portion (13) is extended from the free end of the main folding portion (12) away from the main body portion (11); the secondary folding portion (13) is formed by folding the free end of the main folding portion (12) toward the outside of the stator slot (102); and the bearing portion (24) also receives the secondary folding portion (13).

7. The insulation structure of the stator assembly according to claim 6, characterized in that: The secondary folded portion (13) is formed by folding the free end of the primary folded portion (12) toward the outside of the stator slot (102) by 90°-180°.

8. The insulation structure of the stator assembly according to any one of claims 1 to 7, characterized in that: A groove (10) opening toward the insulating bracket (2) is formed between the main folded portion (12) and the main body portion (11).

9. The insulation structure of the stator assembly according to claim 8, characterized in that: A flange (25) is provided on one side edge of the bearing portion (24) close to the winding slot (23) along the profile line of the stator slot (102) and the stator slot opening (104), and the flange (25) is embedded in the groove (10).

10. A motor, characterized in that: An insulation structure comprising a stator assembly as claimed in any one of claims 1 to 9.

11. A compressor, characterized in that: Comprising the motor as claimed in claim 10.

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