Stator assembly, motor and compressor

Abstract

The invention discloses a stator assembly, a motor and a compressor, and relates to the technical field of compressors, the stator assembly comprises a stator core, a winding, a second lead-out wire and a connecting piece, the winding is provided with a plurality of first lead-out wires, and the wire diameter of the first lead-out wires is D1; the wire diameter of the second leading-out wire is D2; the wire passing groove comprises a limiting section and a positioning section which are distributed in the first direction, the width of the limiting section is W1, and the width of the positioning section is W2; wherein W1, W2, D1 and D2 meet the following conditions: W1 is less than W2, D1 is less than or equal to D2, and W1 is more than or equal to 0.5 D2 and less than or equal to D1-0.1. The wire passing groove is designed to comprise the limiting section and the positioning section, W1 is limited to be smaller than W2, D1 is limited to be smaller than or equal to D2, and W1 is limited to be larger than or equal to 0.5 D2 and smaller than or equal to D1-0.1, so that the problem that the first lead-out wire and the second lead-out wire loosen or fall off due to plastic deformation after plastic expansion of the wire passing groove is solved, and the stability of a motor manufacturing process is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a stator assembly, a motor and a compressor. BACKGROUND

[0002] At present, the connection mode of motor lead-out wires in the motor of the compressor is divided into straight lead type and riveting type, wherein the riveting type lead-out wire connects the wires of the three-phase winding and the wires of the external integrated lead-out wire together through the wire passing groove on the stator insulating end plate.

[0003] The diameter of the existing wire passing groove is generally designed to be the same as the diameter of the pressed wire. Since the surface of the wire is covered with an enameled insulation layer, the actual wire diameter will be slightly larger than the designed diameter of the wire passing groove. During the pressing process, the wire passing groove will be squeezed, resulting in expansion and plastic deformation of the wire passing groove. After the slot opening is expanded, the wire cannot be clamped tightly, thereby causing the lead-out wire to loosen or even fall off in the subsequent process, affecting the stability of the motor manufacturing process. SUMMARY

[0004] The main purpose of the present application is to provide a stator assembly, a motor and a compressor, which aims to improve the stability of the motor manufacturing process.

[0005] To achieve the above-mentioned purpose, the stator assembly provided by the present application comprises: a stator core; a winding wound on the stator core, the winding having a plurality of first lead-out wires, the wire diameter of the first lead-out wire being D1; a second lead-out wire for connecting the first lead-out wire and an external circuit, the wire diameter of the second lead-out wire being D2; a connecting piece provided on the stator core, the connecting piece being provided with a terminal cavity, the cavity wall of the terminal cavity being provided with a plurality of wire passing grooves, the first lead-out wire and the second lead-out wire being clamped into the corresponding wire passing grooves along a first direction; the wire passing groove comprises a limiting section and a positioning section distributed along the first direction, the positioning section being arranged close to the bottom of the wire passing groove, the width of the limiting section being W1, and the width of the positioning section being W2; wherein W1, W2, D1 and D2 satisfy: W1

[0006] In an embodiment, the corresponding slot side wall of the limiting section has elasticity and can be elastically deformed when the first lead-out wire or the second lead-out wire is pressed along the first direction.

[0007] In an embodiment, the elastic deformation amount of the corresponding slot side wall of the limiting section is T, and T

[0008] In an embodiment, W2 satisfies: 0.2≤W1 / W2≤0.8; and / or, D2≤W2≤1.36D1.

[0009] In an embodiment, the slot side wall corresponding to the positioning section is linear or arc-shaped in a cross section taken by a plane extending along the first direction.

[0010] In an embodiment, the slot side wall corresponding to the positioning section and the slot bottom wall are connected through a first fillet, and a minimum radius R of the first fillet satisfies: R≥0.5D1.

[0011] In an embodiment, the wire passing slot further comprises a guiding section, the guiding section is arranged at an end of the limiting section away from the positioning section, and a width of the guiding section gradually decreases in a direction towards the positioning section.

[0012] In an embodiment, a maximum width of the guiding section is W3, and W3 satisfies: W3≥1.5D2.

[0013] In an embodiment, an included angle between two slot side walls corresponding to the guiding section satisfies: 30°≤θ≤120°.

[0014] In an embodiment, the guiding section and the limiting section are connected through a second fillet.

[0015] In an embodiment, a length of the limiting section along the first direction is L1, a length of the positioning section along the first direction is L2, and a sum of the lengths of the limiting section, the positioning section and the guiding section along the first direction is L, L1, L2 and L satisfy: L1+L2≥0.7L, L1≥0.5L, and L2≥1.2D2.

[0016] In an embodiment, a thickness of a cavity wall of the terminal cavity satisfies: 0.2D1≤t≤0.8D2.

[0017] The application further provides an electric machine comprising the stator assembly.

[0018] The application further provides a compressor comprising the electric machine.

[0019] The technical scheme of the present application designs the wire passing groove to include a limiting section and a positioning section, limits the width W1 of the limiting section and the width W2 of the positioning section to meet W1W2, D1≤D2, and 0.5D2≤W1≤D1-0.1, so that the first lead-out wire or the second lead-out wire can smoothly pass through the narrower limiting section into the wider positioning section during the pressing-in process along the first direction, and when the reverse force is applied, the first lead-out wire and the second lead-out wire are prevented from being pulled out because the diameters of the first lead-out wire and the second lead-out wire are both greater than the width of the limiting section, thereby avoiding the problems of loosening or falling off of the first lead-out wire and the second lead-out wire caused by plastic deformation of the wire passing groove after plastic expansion, and improving the stability of the motor manufacturing process. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0021] Figure 1 a top view of an embodiment of the stator assembly provided by the present application; Figure 2 a side view of the stator assembly in Figure 1 Figure 3 a cross-sectional view of the assembly of the connecting piece, the first lead-out wire and the second lead-out wire in Figure 1 Figure 4 a partial schematic view of the wire passing groove of the connecting piece in Figure 3 Figure 5 a top view of the connecting piece in Figure 1 Figure 6 a partial schematic view of the wire passing groove of the connecting piece in Figure 5 Figure 7 a change graph of the influence of W1 / W2 on the contact resistance and the manufacturing failure rate.

[0022] BRIEF DESCRIPTION OF DRAWINGS 100, stator core; 200, first lead-out wire; 300, second lead-out wire; 400, connecting piece; 410, terminal cavity; 420, wire passing groove; 421, limiting section; 422, positioning section; 423, guiding section; 424, first round corner; 425, second round corner.

[0023] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. ​​​​​DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0026] In addition, if the embodiments of the present application involve descriptions such as “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is also not within the protection scope of the present application.

[0027] The present application provides a stator assembly.

[0028] Please refer to Figures 1 to 5In one embodiment of the present invention, the stator assembly includes a stator core 100, a winding, a second lead 300, and a connector 400. The winding is wound on the stator core 100 and has a plurality of first leads 200, the wire diameter of which is D1. The second leads 300 are used to connect the first leads 200 and an external circuit, and the wire diameter of which is D2. The connector 400 is disposed on the stator core 100 and has a terminal cavity 410. The wall is provided with multiple wire passage grooves 420. The first lead wire 200 and the second lead wire 300 are inserted into the corresponding wire passage grooves 420 along the first direction. The wire passage groove 420 includes a limiting section 421 and a positioning section 422 distributed along the first direction. The positioning section 422 is located near the bottom of the wire passage groove 420. The width of the limiting section 421 is W1, and the width of the positioning section 422 is W2. Among them, W1, W2, D1 and D2 satisfy: W1 < W2, D1 ≤ D2, and 0.5D2 ≤ W1 ≤ D1 - 0.1.

[0029] Specifically, the stator core 100 is the main structure of the motor stator, composed of multiple stacked silicon steel sheets, used to form the motor's magnetic circuit. The windings are coils wound on the stator core 100, with a first lead 200 extending from its end. The first lead 200 has a wire diameter of D1 and is typically a wire with enameled insulation. The second lead 300 is a cable or connector used to connect the first lead 200 to the compressor's external circuitry, achieving electrical connection between the motor's internal windings and the external power supply; its wire diameter is D2.

[0030] The connector 400 is an insulating component mounted on the stator core 100, such as an insulating end plate or terminal block. It has a terminal cavity 410 inside, used to accommodate crimped terminals (not shown) and provide insulation protection for electrical connections. The cavity wall of the terminal cavity 410 has multiple wire-passing grooves 420. The first lead 200 and the second lead 300 are inserted into their respective wire-passing grooves 420 along a first direction (i.e., the pressing direction from the groove opening to the groove bottom) to achieve positioning and guidance of the first lead 200 or the second lead 300. The wire guide 420 is divided into a limiting section 421 and a positioning section 422 along the first direction. The positioning section 422 is located near the bottom of the wire guide 420 and has a width of W2. It is used to stably support and position the first lead wire 200 or the second lead wire 300 that has been pressed in. The limiting section 421 is located in the area near the opening of the groove and has a width of W1. It is used to prevent the first lead wire 200 or the second lead wire 300 from coming out of the wire guide 420 after assembly.

[0031] In one implementation, please refer to Figure 5The connecting piece 400 comprises an outer side plate, an inner side plate and a plurality of insulating tooth portions connecting the outer side plate and the inner side plate. The outer side plate and the inner side plate enclose a terminal cavity 410, and the insulating tooth portions are arranged along the length direction of the terminal cavity 410 to divide the terminal cavity 410 into a plurality of sub-cavities. The outer side plate and the inner side plate are provided with a wire passing groove 420 corresponding to each sub-cavity, and the wire passing grooves 420 on the corresponding outer side plate and inner side plate of each sub-cavity are oppositely arranged. The number of the first lead-out wire 200 and the second lead-out wire 300 on each connecting piece 400 is the same. Please refer to Figure 3 The first lead-out wire 200 and the second lead-out wire 300 on the same connecting piece 400 are pressed into different wire clamping grooves, and then inserted into the crimping terminal to realize connection.

[0032] Among them, please refer to Figure 3 and Figure 4 The wire diameter D1 of the first lead-out wire 200 and the wire diameter D2 of the second lead-out wire 300 can be measured by using a digital micrometer or a high-precision vernier caliper. Taking the first lead-out wire 200 as an example, the measurement surface of the micrometer is gently clamped to the first lead-out wire 200 to ensure that the measurement surface is perpendicular to the axis of the first lead-out wire 200. Slowly rotate the force device of the micrometer until a “click” sound is heard (indicating that the standard measurement force is reached), and avoid pressing the first lead-out wire 200 too hard. Read the value on the display screen or the scale. The measurement position includes the outer diameter of the wire with a varnish insulation layer. Measure the first lead-out wire 200 at different positions (at least 3 points), and take the average value as the representative wire diameter D1 of the first lead-out wire 200. The second lead-out wire 300 is measured in the same way to obtain the wire diameter D2 of the second lead-out wire 300.

[0033] The width W1 of the limiting section 421 and the width W2 of the positioning section 422 can be measured by using an image measuring instrument, a tool microscope with a micrometer eyepiece, a high-precision plug gauge, or a high-power magnifying glass combined with a standard scale or a digital caliper, and the following is an example of measuring the width W1 of the limiting section 421 by using an image measuring instrument: The connecting piece 400 is stably installed on the stage of the image measuring instrument; the lens is adjusted to align with the region (limiting section 421) to be measured of the wire slot 420, and an appropriate magnification is selected to ensure that the edges of the slot can be clearly distinguished; a representative region with a substantially constant width in the limiting section 421 is selected for measurement; the clear edges of the inner walls on both sides of the wire slot 420 are automatically or manually captured by using the edge detection function of the image measuring instrument; the distance between the two points is automatically calculated by the instrument, which is the slot width at this position; the width W1 of the limiting section 421 is obtained by measuring different positions in the first direction of the same limiting section 421 and taking the average value. The width of the positioning section 422 is measured in the same way, and for the positioning section 422 with straight side walls extending along the first direction, the average value of the slot widths measured in the measurement region is taken as the width W2 of the positioning section 422; for the positioning section 422 with arc side walls, the average value of the width of the region with the largest width measured multiple times is taken as the width W2 of the positioning section 422.

[0034] W1 < W2, i.e., the limiting section 421 is narrower than the positioning section 422, so that the first lead-out wire 200 or the second lead-out wire 300 can be smoothly pressed into the positioning section 422 from the limiting section 421 during assembly, and after being pressed into the positioning section 422, the first lead-out wire 200 or the second lead-out wire 300 is difficult to be pulled out from the limiting section 421 with smaller width. D1 < D2, i.e., the diameter of the first lead-out wire 200 can be the same as or smaller than the diameter of the second lead-out wire 300. In this way, the stator assembly can be adapted to different specifications of the first lead-out wire 200, thereby improving the compatibility of the stator assembly to the first lead-out wire 200. W1 > 0.5D2 to ensure that the limiting section 421 has sufficient width to ensure that it can be smoothly entered. W1 < D1-0.1 to ensure that the width of the limiting section 421 is smaller than the diameter of the first lead-out wire 200 (with a 0.1mm allowance), and when the first lead-out wire 200 or the second lead-out wire 300 is pressed in, the diameter of the first lead-out wire 200 or the second lead-out wire 300 is greater than the width of the limiting section 421, so that the enamel insulation layer of the first lead-out wire 200 or the second lead-out wire 300 deforms at the positioning section 422, and is pressed into the positioning section 422 under the action of pressure, and the slot width of the positioning section 422 is larger, so that the positioning section 422 restores the deformation; or, it can also be that the enamel insulation layer of the first lead-out wire 200 or the second lead-out wire 300 does not deform when passing through the limiting section 421, but the elastic deformation of the slot side wall of the limiting section 421 occurs to expand the slot of the limiting section 421, and the limiting section 421 restores the elastic deformation and maintains the initial shape after the first lead-out wire 200 or the second lead-out wire 300 is smoothly pressed into the positioning section 422. At this time, the limiting section 421 plays a blocking role on the first lead-out wire 200 or the second lead-out wire 300 assembled into the positioning section 422, and finally fixes the corresponding first lead-out wire 200 and the second lead-out wire 300 in the positioning section 422, thereby avoiding the problem that the first lead-out wire 200 or the second lead-out wire 300 is loose or even falls off after being pressed into the overline slot 420 due to the plastic deformation of the overline slot 420 after expansion, thereby improving the stability of the motor manufacturing process.

[0035] The technical scheme of the present application designs the wire passing groove 420 to include a limiting section 421 and a positioning section 422, limits the width W1 of the limiting section 421 and the width W2 of the positioning section 422 to satisfy W1 < W2, D1 ≤ D2, and 0.5D2 ≤ W1 ≤ D1-0.1, so that the first lead-out wire 200 or the second lead-out wire 300 can smoothly pass through the narrower limiting section 421 into the wider positioning section 422 during the pressing-in process along the first direction, and when a reverse force is applied, the first lead-out wire 200 and the second lead-out wire 300 are prevented from being pulled out because their diameters are both larger than the width of the limiting section 421, thereby avoiding the problems of loosening or falling off of the first lead-out wire 200 and the second lead-out wire 300 caused by plastic deformation of the wire passing groove 420 after plastic expansion, and improving the stability of the motor manufacturing process.

[0036] In an embodiment, referring to Figure 4 , the groove sidewall corresponding to the limiting section 421 is elastic and can be elastically deformed when the first lead-out wire 200 or the second lead-out wire 300 is pressed in along the first direction.

[0037] When the first lead-out wire 200 or the second lead-out wire 300 is pressed into the wire passing groove 420 along the first direction, the first lead-out wire 200 and the second lead-out wire 300 will exert a radial pressure on the groove sidewall when passing through the limiting section 421 because the outer diameter of the first lead-out wire 200 and the second lead-out wire 300 is larger than the width W1 of the limiting section 421; at this time, the groove sidewall of the limiting section 421 elastically deforms outward under the pressure, temporarily expanding the opening of the limiting section 421, thereby allowing the first lead-out wire 200 and the second lead-out wire 300 to pass through smoothly; after the first lead-out wire 200 and the second lead-out wire 300 are completely pressed in and enter the wider positioning section 422, the groove sidewall rebounds due to the elastic recovery ability of the material and returns to the original shape; at this time, the first lead-out wire 200 or the second lead-out wire 300 is located in the positioning section 422, and the elastically recovered limiting section 421 forms a mechanical block between the positioning section 422 and the groove opening of the wire passing groove 420, preventing it from being pulled out under mechanical vibration or reverse action of the next process.

[0038] The traditional rigid wire slot 420 can be plastically deformed under multiple crimping or interference fit, resulting in an increase in slot width and a decrease in locking force. The elastic deformation of the slot side wall of the limiting section 421 is reversible, and flexible expansion can be achieved during the pressing process, avoiding the problem of loosening or falling of the first lead-out wire 200 and the second lead-out wire 300 caused by plastic expansion of the wire slot 420, improving the stability of the motor manufacturing process. At the same time, the crimping force is reduced, avoiding damage to the insulation layer of the first lead-out wire 200 or the second lead-out wire 300, and improving the assembly yield. The slot side wall after elastic recovery forms a physical barrier to the first lead-out wire 200 or the second lead-out wire 300 that has been pressed in. Even if the first lead-out wire 200 or the second lead-out wire 300 is subjected to vibration, thermal expansion and contraction, or electromagnetic force impact during motor operation, it is difficult for the first lead-out wire 200 or the second lead-out wire 300 to escape from the limiting section 421. In addition, in actual production, there are small fluctuations in cable diameter, mold precision, material shrinkage, etc. The elastic slot side wall can automatically adapt to a certain range of size deviations, improve the tolerance of the product to manufacturing tolerances, and reduce the defect rate.

[0039] In other embodiments, the enameled insulation layer of the first lead-out wire 200 and the second lead-out wire 300 can have a large thickness, so that when the first lead-out wire 200 and the second lead-out wire 300 pass through the limiting section 421, the enameled insulation layer can produce a large elastic deformation, facilitating the first lead-out wire 200 and the second lead-out wire 300 to smoothly pass through the limiting section 421.

[0040] In an embodiment, the elastic deformation amount of the slot side wall corresponding to the limiting section 421 is T, and T≤D1-0.1.

[0041] The elastic deformation amount T refers to the recoverable deformation amount in the single or total width direction of the slot side wall of the limiting section 421 caused by the outward expansion under the radial pressure when the first lead-out wire 200 or the second lead-out wire 300 is pressed into the limiting section 421 along the first direction. The deformation amount T mainly depends on the elastic modulus of the connecting piece 400 material, the slot wall thickness and the structural design. On the one hand, by limiting T≤D1-0.1, it is ensured that the slot side wall of the limiting section 421 has sufficient elastic deformation capacity, so that the first lead-out wire 200 or the second lead-out wire 300 can be smoothly pressed into the limiting section 421, avoiding the enameled wire insulation layer being scratched or crushed due to rigid interference; on the other hand, it can prevent the slot side wall of the limiting section 421 from causing material fatigue or local stress concentration due to excessive deformation, avoiding permanent plastic deformation or even cracking of the slot side wall of the limiting section 421, and ensuring the structural integrity and long-term reliability of the connecting piece 400.

[0042] In addition, in combination with the size relationship W1≤D1-0.1, it can be seen that the original width of the limiting section 421 is obviously smaller than the diameter of the first lead-out wire 200, and the upper limit of the design of the elastic deformation variable T corresponds thereto, which means that only a moderate elastic expansion of the slot side wall is needed to complete the assembly, which not only ensures the feasibility of the pressing-in process, but also ensures that an effective locking force can be formed after the elastic rebound, thereby realizing the self-locking effect of easy assembly and difficult disassembly.

[0043] In an embodiment, please refer to Figure 4 , W2 satisfies: 0.2≤W1 / W2≤0.8; and / or, D2≤W2≤1.36D1.

[0044] The width W2 of the positioning section 422 will affect the tightness of the first lead-out wire 200 and the second lead-out wire 300 in the positioning section 422. If the width W2 of the positioning section 422 is too wide, it will easily cause the first lead-out wire 200 or the second lead-out wire 300 to loosen, thereby causing poor contact between the first lead-out wire 200 and the second lead-out wire 300, increasing the contact resistance, and thus generating additional heat, causing local temperature rise, and also causing current fluctuation, affecting the normal operation of the motor. If the width W2 of the positioning section 422 is too narrow, it will cause the first lead-out wire 200 and the second lead-out wire 300 to be difficult to be clamped into the positioning section 422, and even cause the insulation layer of the enameled wire of the first lead-out wire 200 and the second lead-out wire 300 to be damaged, increasing the manufacturing defect rate.

[0045] By controlling the relative size of the width W1 of the limiting section 421 and the width W2 of the positioning section 422 to satisfy 0.2≤W1 / W2≤0.8, a reasonable structural gradient is formed between the two. When W1 / W2≥0.2, it indicates that the limiting section 421 is not too narrow, which is conducive to the smooth passage of the first lead-out wire 200 and the second lead-out wire 300, avoiding excessive pressing-in force or excessive deformation of the elastic side wall due to too small inlet. At the same time, it also indicates that the positioning section 422 is not too wide, which can effectively reduce the risk of loosening of the first lead-out wire 200 or the second lead-out wire 300, thereby reducing the contact resistance. When W1 / W2≤0.8, it ensures that W2 is significantly greater than W1, forming a sufficient width step to ensure that the first lead-out wire 200 or the second lead-out wire 300 in the positioning section 422 is difficult to be disassembled in reverse; at the same time, it also indicates that the positioning section 422 is not too narrow, avoiding damage to the insulation layer of the enameled wire of the first lead-out wire 200 and the second lead-out wire 300, and reducing the manufacturing defect rate. The design of 0.2≤W1 / W2≤0.8 takes into account the dual needs of easy assembly and difficult disassembly of the limiting section 421, as well as the dual needs of difficult disassembly and low damage of the positioning section 422, thereby improving the overall mechanical stability of the wire slot 420 and the safety of the motor operation.

[0046] Please refer to Figure 7, the contact resistance of the first lead-out wire 200 and the second lead-out wire 300 decreases with the increase of W1 / W2 and tends to be stable when W1 / W2>0.8. When 0.2≤W1 / W2≤0.8, the contact resistance is between 2.1 mΩ and 3.2 mΩ, that is, the contact resistance of the first lead-out wire 200 and the second lead-out wire 300 is low at this time. When W1 / W2=0.8, the contact resistance is the lowest, which is 2.1 mΩ. The manufacturing defective rate of the first lead-out wire 200 and the second lead-out wire 300 first decreases with the increase of W1 / W2, and then increases with the increase of W1 / W2 when the manufacturing defective rate reaches the lowest. When 0.2≤W1 / W2≤0.8, the manufacturing defective rate is between 0.6% and 1.0% when 0.2≤W1 / W2≤0.8. When W1 / W2=0.6, the manufacturing defective rate is the lowest, which is 0.6%.

[0047] It can be seen that by controlling 0.2≤W1 / W2≤0.8, the risk of loose heating caused by too wide W2 and the assembly damage problem caused by too narrow W2 are effectively avoided, which not only ensures the stable fixation of the first lead-out wire 200 and the second lead-out wire 300 in the positioning section 422, but also improves the reliability of electrical connection and reduces the contact resistance. In addition, the pressing process is optimized, and the manufacturing defective rate is reduced.

[0048] Further, please refer to Figure 4 , by controlling D2≤W2, it is ensured that the width of the positioning section 422 is not less than the wire diameter of the second lead-out wire 300, and sufficient accommodation space is provided for the first lead-out wire 200 and the second lead-out wire 300, so as to prevent assembly difficulty or insulation damage caused by insufficient gap and manufacturing defective rate; by controlling W2≤1.36D1, the width of the positioning section 422 is limited to avoid the first lead-out wire 200 and the second lead-out wire 300 from shaking in the positioning section 422, and to avoid that too large W2 will cause the first lead-out wire 200 and the second lead-out wire 300 to be not fixed firmly, which is easy to cause poor contact and temperature rise problem, thereby reducing the contact resistance. In addition, at the same time, since the wire diameter D1 of the first lead-out wire 200 and the wire diameter 2 of the second lead-out wire 300 are both greater than the width W2 of the positioning section 422, the positioning section 422 is compatible with various enameled wires, and the compatibility of the connecting piece 400 to enameled wires with different wire diameters is improved.

[0049] By controlling 0.2≤W1 / W2≤0.8 and D2≤W2≤1.36D1, the width W2 of the positioning section 422 is finely controlled from the relative proportion and the absolute size two dimensions, effectively avoiding the risk of loose heating caused by too wide W2 and the assembly damage problem caused by too narrow W2, which not only ensures the stable fixation of the first lead-out wire 200 and the second lead-out wire 300 in the positioning section 422, but also improves the reliability of electrical connection and reduces the contact resistance. In addition, the design optimizes the pressing process and reduces the manufacturing failure rate. At the same time, the design enhances the adaptability of the stator assembly to different wire diameters, which is conducive to product platformization and standardization, and significantly improves the safety, stability and manufacturing consistency of the motor in long-term operation.

[0050] In an embodiment, the slot side wall corresponding to the positioning section 422 is linear in the cross section taken by the plane extending in the first direction.

[0051] The linear slot side wall makes the two side walls of the positioning section 422 be the plane extending in the first direction, so that the cross section of the positioning section 422 is rectangular or trapezoidal. This structure is simple to process and accurate in size control, which is convenient to realize the surface contact or approximate surface contact with the outer circle of the first lead-out wire 200 or the second lead-out wire 300, and is conducive to uniform transmission of the pressing force and reduction of local stress concentration.

[0052] In another embodiment, please refer to Figure 4 , the slot side wall corresponding to the positioning section 422 is arc-shaped in the cross section taken by the plane extending in the first direction.

[0053] The arc-shaped slot side wall makes the side wall profile of the positioning section 422 be circular arc, and the curvature can match the outer circular arc of the first lead-out wire 200 or the second lead-out wire 300 to form an envelope contact. This structure can better adapt to the circular cross section of the first lead-out wire 200 or the second lead-out wire 300, provide more uniform support force during pressing, effectively disperse contact stress, prevent damage to the insulation layer caused by point stress, and at the same time, has better inclusiveness to slight fluctuations in wire diameter, improving assembly tolerance capability.

[0054] In an embodiment, please refer to Figure 4 , the slot side wall corresponding to the positioning section 422 is connected to the slot bottom wall through a first fillet 424, and the minimum radius R of the first fillet 424 satisfies: R≥0.5D1.

[0055] The first fillet 424 is arranged at the connection between the groove side wall and the groove bottom wall of the positioning section 422, which can effectively avoid the stress concentration problem caused by the traditional right-angle structure. When the first lead-out wire 200 or the second lead-out wire 300 is pressed into the positioning section 422 along the first direction, the contact area between the first lead-out wire 200 or the second lead-out wire 300 and the groove bottom and the side wall will bear a certain extrusion and friction force. If the connection is a sharp right angle, not only the lacquered insulation layer on the surface of the first lead-out wire 200 or the second lead-out wire 300 is easy to scratch or break during the pressing process, resulting in a decrease in local insulation performance or even a short circuit risk, but also the right-angle structure is easy to cause stress concentration during injection molding, which reduces the mechanical strength of the connecting piece 400 itself and may cause micro-cracks or breakage in long-term use. By arranging the first fillet 424 for smooth transition, when R≥0.5D1, the curvature is gentle enough to effectively guide the first lead-out wire 200 and the second lead-out wire 300 to smoothly slide into the bottom of the positioning section 422, reducing the friction resistance and local extrusion during the pressing process. At the same time, the larger fillet radius can make the stress more evenly distributed inside the connecting piece 400, improve the structural fatigue resistance, and prevent material cracking caused by repeated assembly or running vibration.

[0056] In an embodiment, referring to Figure 3 and Figure 4 The wire passing groove 420 further comprises a guide section 423, which is arranged at one end of the limiting section 421 away from the positioning section 422, and the width of the guide section 423 gradually decreases in the direction towards the positioning section 422.

[0057] The guide section 423 is located near the opening of the wire passing groove 420, and the width of the guide section 423 gradually narrows from the opening to the groove bottom. The two opposite groove side walls of the guide section 423 can form an included angle with the groove side walls of the limiting section 421, so that the guide section 423 is trumpet-shaped; or one of the groove side walls of the guide section 423 forms an included angle with the corresponding groove side wall of the limiting section 421, and the other groove side wall of the guide section 423 is connected to the other corresponding groove side wall of the limiting section 421 in a straight line. When the first lead-out wire 200 or the second lead-out wire 300 is introduced into the wire passing groove 420 during the crimping process, even if there is a slight positional deviation, the inclined side wall of the guide section 423 can automatically guide and correct the first lead-out wire 200 or the second lead-out wire 300, so that it is aligned with the entrance of the limiting section 421, avoiding damage to the first lead-out wire 200 or the second lead-out wire 300 caused by eccentric pressing.

[0058] In addition, the tapered structure of the guide section 423 significantly reduces the initial pressing force. In a conventional straight-wall groove design without the guide section 423, the first lead-out wire 200 and the second lead-out wire 300 need to overcome the elastic contraction force or frictional resistance of the entire limiting section 421 at once, which is likely to cause a sudden increase in the pressing force, resulting in excessive load on the equipment or damage to the enameled insulation layer. By providing the guide section 423, the pressing force rises smoothly during the pressing process, which is conducive to stable control of the automatic pressing process and improves production efficiency and product consistency.

[0059] In an embodiment, referring to Figure 4 , the maximum width of the guide section 423 is W3, and W3 satisfies: W3≥1.5D2.

[0060] The maximum width W3 of the guide section 423 is located at the slot opening of the wire passing groove 420. The maximum width W3 of the guide section 423 determines the spatial allowance of the first lead-out wire 200 and the second lead-out wire 300 when they initially enter the wire passing groove 420. By setting W3≥1.5D2, it can effectively ensure that the first lead-out wire 200 and the second lead-out wire 300 have sufficient assembly tolerance. In actual production, especially in the automatic pressing process, there may be slight positional deviation or angular inclination between the first lead-out wire 200 and the second lead-out wire 300 and the wire passing groove 420. If the opening of the guide section 423 is too small, the first lead-out wire 200 and the second lead-out wire 300 are likely to hit the slot edge, causing damage to their enameled insulation layer or pressing deviation. W3≥1.5D2 provides sufficient alignment window, so that the first lead-out wire 200 or the second lead-out wire 300 can be smoothly introduced even if there is a certain deviation, significantly reducing the requirement for assembly precision and improving production rhythm and yield.

[0061] In an embodiment, referring to Figure 4 , the two slot side walls corresponding to the guide section 423 form an included angle θ, and θ satisfies: 30°≤θ≤120°.

[0062] The two opposite side walls of the guide section 423 are inwardly inclined, and the included angle θ refers to the inside included angle formed by the two slot side walls of the guide section 423 during the inward extension. If the included angle is too small (e.g., less than 30°), the guide section 423 will become too long and narrow, forming a deep and narrow entrance structure, which not only increases the difficulty of injection molding, but also may cause the first lead-out wire 200 and the second lead-out wire 300 to be subjected to excessive lateral pressure at the initial pressing stage, increasing the frictional resistance, and even causing damage to the enameled insulation layer. At the same time, a too small included angle will narrow the effective introduction window, reducing the fault tolerance capability for assembly deviation. By limiting θ≥30°, it can ensure that the guide section 423 has a large unfolding angle and provides sufficient introduction space.

[0063] If the included angle is too large (e.g., more than 120°), the guide section 423 tends to be flat and wide, although the inlet is wide, the guiding effect is significantly weakened, and the deflection of the first lead-out wire 200 and the second lead-out wire 300 cannot be effectively corrected, and the guiding function is lost. In addition, the included angle that is too large can cause the connecting piece 400 to be weak in structure in the notch area, affecting the overall mechanical strength. By limiting θ≤120°, the guide section 423 can have sufficient convergence to effectively center and gradually converge the first lead-out wire 200 and the second lead-out wire 300, and ensure smooth transition to the limiting section 421.

[0064] By limiting 30°≤θ≤120°, the guide section 423 can achieve a good balance between guiding efficiency and guiding accuracy, ensuring that the first lead-out wire 200 or the second lead-out wire 300 is easy to enter, and that the first lead-out wire 200 or the second lead-out wire 300 is gradually centered during the pressing process, and accurately enters the subsequent limiting section 421 and positioning section 422, improving assembly consistency.

[0065] In an embodiment, please refer to Figure 4 The guide section 423 and the limiting section 421 are connected by a second round corner 425.

[0066] The guide section 423, the limiting section 421 and the positioning section 422 are arranged in sequence along the first direction, the guide section 423 and the limiting section 421 are connected by the second round corner 425, the second round corner 425 is located between the narrowed end of the guide section 423 and the starting end of the limiting section 421, making the change of the groove side wall from wide to narrow more smooth and continuous, which can avoid the formation of obvious steps or sharp corner structures at the intersection of the guide section 423 and the limiting section 421, and when the lead-out wire is pressed along the first direction, the contact between the surface of the lead-out wire and the groove wall changes from point contact or line contact to more uniform surface contact, which significantly reduces the local pressure and frictional resistance, avoids scratching, extrusion or even local damage to the enameled insulation layer of the first lead-out wire 200 and the second lead-out wire 300 during the pressing process, affects the electrical insulation performance, and increases the risk of short circuit. At the same time, during the injection molding process of the connecting piece 400, the second round corner 425 also reduces the risk of stress concentration, improves the fatigue resistance and mechanical strength of the material, reduces the occurrence of micro-cracks or structural fractures of the product in use, and improves the durability of the product.

[0067] In an embodiment, please refer to Figure 4 The length of the limiting section 421 along the first direction is L1, the length of the positioning section 422 along the first direction is L2, and the sum of the lengths of the limiting section 421, the positioning section 422 and the guide section 423 along the first direction is L, L1, L2 and L satisfy: L1+L2≥0.7L, and L1≥0.5L, L2≥1.2D2.

[0068] The guide section 423 realizes initial introduction and centering, the limiting section 421 realizes anti-dropping locking, and the positioning section 422 provides stable support and compression space. L1+L2≥0.7L indicates that the total length of the limiting section 421 and the positioning section 422 accounts for more than 70% of the full length of the wire-through slot 420, which means that the main function of the wire-through slot 420 is concentrated on the locking and fixing of the first lead-out wire 200 and the second lead-out wire 300, effectively preventing the problem of insufficient overall pull-out resistance caused by a too short locking section, and improving the mechanical stability of the connecting piece 400. L1≥0.5L further emphasizes the dominant position of the limiting section 421 in length. As a key structure for preventing the first lead-out wire 200 and the second lead-out wire 300 from falling out, the longer size of the limiting section 421 means a larger contact area and stronger blocking ability. When the first lead-out wire 200 or the second lead-out wire 300 is pressed in, the limiting section 421 forms a continuous coating along the length direction of the first lead-out wire 200 and the second lead-out wire 300, effectively suppressing the micro-motion or back-off trend of the first lead-out wire 200 and the second lead-out wire 300, and significantly improving the anti-loose performance. L2≥1.2D2 is the minimum requirement for the axial length of the positioning section 422, ensuring that it has enough space to accommodate the first lead-out wire 200 and the second lead-out wire 300 and achieve reliable connection with the compression terminal. The positioning section 422 not only supports the cable, but also provides a stable positioning reference for the compression process. If L2 is too short, the compression terminal may be partially suspended or insufficiently contacted, resulting in loose compression, increased contact resistance, and further causing local temperature rise and current fluctuation. By setting L2≥1.2D2, both the conventional compression length requirement and the assembly error within a certain range can be met, ensuring the stability and current-carrying capacity of the electrical connection. In addition, the design of L2≥1.2D2 also improves the compatibility and adaptation ability of the first lead-out wire 200 with different diameters or the second lead-out wire 300 with different diameters.

[0069] In an embodiment, referring to Figure 5 and Figure 6 the thickness of the cavity wall of the terminal cavity 410 is t, and t satisfies: 0.2D1≤t≤0.8D2.

[0070] The thickness t of the cavity wall of the terminal cavity 410 is the overall thickness of the wire-through slot 420, and the thickness t of the cavity wall of the terminal cavity 410 directly affects the structural stiffness, deformation resistance, insulation performance, etc. of the connecting piece 400.

[0071] D1 is the wire diameter of the first lead-out wire 200, by limiting 0.2D1≤t, it can be ensured that the cavity wall of the terminal cavity 410 has sufficient rigidity, and after the first lead-out wire 200 or the second lead-out wire 300 is pressed in, the over-line slot 420 will not produce destructive plastic deformation; it can also ensure that the cavity wall of the terminal cavity 410 has sufficient structural strength, which can withstand the pressure applied in the crimping process and the vibration load in the motor operation, avoid the cavity deformation, rupture or slot wall collapse due to the too thin wall thickness, thereby affecting the geometric accuracy and locking function of the limiting section 421 and the positioning section 422. At the same time, the larger wall thickness is also conducive to improving the material flow stability and demolding performance during injection molding, and reducing manufacturing defects.

[0072] D2 is the wire diameter of the second lead-out wire 300, by limiting t≤0.8D2, it can avoid that the over-line slot 420 is too rigid, which causes the slot side wall of the limiting section 421 to be unable to produce elastic deformation when the first lead-out wire 200 or the second lead-out wire 300 is pressed into the over-line slot 420, so that the first lead-out wire 200 or the second lead-out wire 300 cannot be pressed into the over-line slot 420; it can also avoid that the wall thickness is too large and occupies too much space, if the cavity wall is too thick, it will compress the internal available space, limit the arrangement of the first lead-out wire 200 or the second lead-out wire 300 and the crimping terminal, which is not conducive to miniaturization design. In addition, the too thick wall may cause material waste, weight increase and uneven cooling shrinkage, affecting product consistency.

[0073] The application also provides a motor, which comprises a stator assembly, the specific structure of which is referred to the above-mentioned embodiments, since the motor adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0074] The application also provides a compressor, which comprises a motor, the specific structure of which is referred to the above-mentioned embodiments, since the compressor adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0075] The above-mentioned is only an exemplary embodiment of the application, and does not limit the patent scope of the application, any equivalent structural transformation made by referring to the content of the specification and drawings of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A stator assembly characterized by, The application relates to a stator assembly. The stator assembly comprises: a stator core; a winding wound on the stator core, the winding having a plurality of first lead-out wires, the first lead-out wires having a wire diameter D1; a second lead-out wire for connecting the first lead-out wires and an external circuit, the second lead-out wire having a wire diameter D2; a connecting piece provided on the stator core, the connecting piece being provided with a terminal cavity, a cavity wall of the terminal cavity being provided with a plurality of wire passing grooves, the first lead-out wires and the second lead-out wire being clamped into corresponding wire passing grooves along a first direction; the wire passing grooves comprise a limiting section and a positioning section distributed along the first direction, the positioning section being arranged close to the bottom of the wire passing grooves, the limiting section having a width W1, and the positioning section having a width W2; 2. The stator assembly of claim 1, wherein, wherein W1, W2, D1 and D2 satisfy: W1 < W2, D1 <= D2, and 0.5D2 <= W1 <= D1-0.

1.

3. The stator assembly of claim 2, wherein, The corresponding groove side wall of the limiting section has elasticity and can be elastically deformed when the first lead-out wire or the second lead-out wire is pressed along the first direction.

4. The stator assembly of claim 1, wherein, The elastic deformation amount of the corresponding groove side wall of the limiting section is T, and T <= D1-0.

1.

5. The stator assembly of claim 1, wherein, W2 satisfies: 0.2 <= W1 / W2 <= 0.8; and / or, D2 <= W2 <= 1.36D1.

6. The stator assembly of claim 1, wherein, The corresponding groove side wall of the positioning section is linear or arc-shaped when being cut by a plane extending along the first direction.

7. The stator assembly of claim 1, wherein, The corresponding groove side wall of the positioning section and the groove bottom wall are connected through a first round corner, and the minimum radius R of the first round corner satisfies: R >= 0.5D1.

8. The stator assembly of claim 7, wherein, The wire passing grooves further comprise a guide section, the guide section being arranged at one end of the limiting section away from the positioning section, and the width of the guide section gradually decreases along the direction towards the positioning section.

9. The stator assembly of claim 7, wherein, The maximum width of the guide section is W3, and W3 satisfies: W3 >= 1.5D2.

10. The stator assembly of claim 7, wherein, The included angle formed by the two groove side walls of the guide section is theta, and theta satisfies: 30° <= theta <= 120°.

11. The stator assembly of claim 7, wherein, The guide section and the limiting section are connected through a second round corner.

12. The stator assembly of claim 1, wherein, The length of the limiting section along the first direction is L1, the length of the positioning section along the first direction is L2, and the sum of the lengths of the limiting section, the positioning section and the guide section along the first direction is L, and L1, L2 and L satisfy: L1+L2 >= 0.7L, L1 >= 0.5L, and L2 >= 1.2D2.

13. An electric machine characterized by The thickness of the cavity wall of the terminal cavity is t, and t satisfies: 0.2D1 <= t <= 0.8D2.

14. A compressor characterized by, The application further relates to a stator assembly comprising any one of the stator assemblies according to claims 1 to 12. The application further relates to an electric machine comprising the electric machine according to claim 13.

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