Wire passing protection structure of insert injection molding stator

Abstract

The wire passing protection structure is arranged at one axial end of an injection molding framework at the outer side of a yoke part and comprises a wire separation plate and a wire protection plate, the wire separation plate is positioned at the radial inner side of the wire protection plate, a wire protection groove is formed between the wire separation plate and the wire protection plate, and the ratio of the radial width of the wire protection groove to the diameter of an enameled wire is 1-1.2. The ratio of the axial height of the wire protection groove to the diameter of the enameled wire is 1.2-2.6. According to the utility model, the size of the wire protection groove is reasonably designed according to the size of the enameled wire, so that the wire protection groove not only can play an anti-impact role on the enameled wire, but also can prevent the surface of the enameled wire from being rubbed, thereby ensuring the integrity and stability of a winding, and improving the reliability and durability of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a kind of overline protection structure of insert injection molding stator. BACKGROUND

[0002] In the prior art, in order to better prevent the stator core from directly contacting moisture, dust and other pollutants in the external environment, avoid the insulation performance of motor components from being reduced, prevent the surface of the stator core from being corroded, deformed or damaged, the stator skeleton is usually injected in the inner slot of the stator core by one-piece injection molding, and plastic sealing is performed after the winding and terminal are installed.

[0003] The stator core is the basic structure of the stator, providing a magnetic flux path, and the coil winding is the key part of the motor to generate electromagnetic force. The stator skeleton is used to fix and protect the coil winding, ensuring that it will not be damaged during operation. The high-pressure injection material during injection molding will directly impact the coil winding, and the enameled wire located at the end of the stator skeleton will be pushed out of the stator skeleton, causing breakage. Therefore, the end of some stator skeletons is provided with a baffle for enclosing an overline slot. For example, the overline slot is formed between the outer baffle and the inner baffle in patent No. CN113949190B. However, the prior art does not design the details of the overline slot. In fact, whether the overline slot can play a role in preventing impact also depends on whether the size design of the overline slot is reasonable. If the size of the overline slot is too large, the enameled wire will sway in the overline slot, increasing the risk of wear and tear and breakage. If the size of the overline slot is too small, it cannot provide sufficient support and protection for the enameled wire. During the injection molding process, if the size of the overline slot is insufficient, the pressure generated during injection molding may still push the enameled wire out of the stator skeleton, causing serious damage. In addition, the size of the overline slot also affects the manufacturing process and production cost of the motor. SUMMARY

[0004] To solve the technical problem that the overline protection structure in the prior art may not be able to protect the enameled wire from being impacted by the injection material, and may even cause wear and tear of the enameled wire, the utility model provides an overline protection structure of an insert injection molding stator to solve the above problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows: an overline protection structure of an insert injection molding stator is arranged at one end of the injection skeleton axially outside the yoke, including a wire separation plate and a wire protection plate. The wire separation plate is located radially inside the wire protection plate, and a wire protection slot is formed between the two. The ratio of the radial width of the wire protection slot to the diameter of the enameled wire is 1-1.2, and the ratio of the axial height of the wire protection slot to the diameter of the enameled wire is 1.2-2.6.

[0006] In the optional embodiment of the utility model, form the wire slot between the injection molded framework and the wire separating plate at the tooth end face, the ratio of the radial width of wire slot and the radial width of wire groove is 2~8, the ratio of the axial height of wire slot and the axial height of wire groove is 2~8.

[0007] In the optional embodiment of the utility model, the ratio of the radial width of wire slot and the radial width of wire groove is equal to the ratio of the axial height of wire slot and the axial height of wire groove.

[0008] In the optional embodiment of the utility model, the ratio of the radial width of wire slot and the radial width of wire groove is 5.

[0009] In the optional embodiment of the utility model, the ratio of the axial height of wire groove and the diameter of enameled wire is 2.

[0010] In the optional embodiment of the utility model, the axial height of wire separating plate is higher than the axial height of wire protection plate.

[0011] In the optional embodiment of the utility model, the length of the arc-shaped end of wire separating plate beyond the winding part of injection molded framework is less than the circumferential length of the winding groove of injection molded framework.

[0012] In the optional embodiment of the utility model, the arc length of wire protection plate is greater than the arc length of wire separating plate.

[0013] In the optional embodiment of the utility model, the radial inner side surface of wire separating plate is flush with the inner surface of injection molded framework at the yoke part.

[0014] In the optional embodiment of the utility model, the radial outer side surface of wire protection plate is flush with the outer surface of injection molded framework at the yoke part.

[0015] The utility model discloses the beneficial effect is:

[0016] (1) the utility model discloses according to the size of enameled wire to the size of wire groove is designed reasonably, makes wire groove can play the anti-impact effect to enameled wire, can also avoid rubbing enameled wire surface, ensures the integrity and stability of winding, improves the reliability and durability of motor.

[0017] (2) the utility model discloses according to the size of injection molded framework to the size of wire groove is further limited, makes the production cost of stator to reduce, and avoids material waste.

[0018] (3) the axial height of wire separating plate in the utility model is higher than the axial height of wire protection plate, i.e. the height of wire protection plate is lower, is used to control the height of wire groove, and the height of wire separating plate is higher, is used to block enameled wire, avoids enameled wire to separate wire separating plate and enter the winding part of injection molded framework. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model is further illustrated below in connection with the drawings and embodiments.

[0020] Figure 1 It is the expansion state schematic diagram of the overline protection structure's in-line stator assembly of the insert injection molding stator of the utility model;

[0021] Figure 2 It is the top view of the overline protection structure's of the insert injection molding stator of the utility model;

[0022] Figure 3 It is the axial section view of the overline protection structure's of the insert injection molding stator of the utility model;

[0023] Figure 4 It is the side view of the overline protection structure's of the insert injection molding stator of the utility model.

[0024] In the figure, 1, stator core, 101, yoke part, 102, tooth part, 2, injection molding framework, 201, winding part, 202, winding slot, 3, enameled wire, 4, winding, 5, line separation plate, 6, wire protection plate, 601, notch, 7, wire protection slot, 8, overline slot, 9, first surface, 10, second surface, 11, third surface, 12, fourth surface. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0026] As Figure 1 and Figure 3As shown, the insert injection molded stator includes a stator core 1 and an injection molded skeleton 2 injection molded on the outer surface of the stator core 1. The stator core 1 includes a yoke 102, a tooth 101, and a tooth shoe connecting the yoke 102 and the tooth 101. The injection molded skeleton 2 is wrapped around the outside of the stator core 1. The injection molded skeleton 2 forms a winding part 201 at the tooth shoe. The grooves on both sides of the winding part 201 are winding grooves 202. The enameled wire 3 passes through the winding grooves 202 and is wound on the winding part 201. When the enameled wire 3 winds from the winding groove 202 inside one yoke 101 to the winding groove 202 inside the other yoke 101, the enameled wire 3 needs to pass through the surface of the injection-molded skeleton 2 at the end of the yoke 101. The wire-passing protection structure of this invention is provided on this surface of the injection-molded skeleton 2 to prevent the enameled wire 3 from being pushed out of the injection-molded skeleton 2 by the pressure during injection molding. The surface where the wire-passing protection structure is located is specifically one axial end of the injection-molded skeleton 2, and is located at the end of the injection-molded skeleton 2 that wraps around the outside of the yoke 101. The wire-passing protection structure is described below with reference to specific embodiments.

[0027] Example 1

[0028] like Figures 1-3 As shown, a wire protection structure for an insert injection-molded stator, used in an in-line stator assembly, includes a wire separator 5 and a wire protector 6. The wire separator 5 is located radially inside the wire protector 6, and a wire protector groove 7 is formed between them. The wire protector groove 7 provides a guiding function for the enameled wire 3. During the winding process, the enameled wire 3 can be clearly wound along the path of the wire protector groove 7 from one winding groove 202 to another winding groove 202. In addition, the injection-molded skeleton 2 located at the end face of the tooth portion 102 can form a wire passage groove 8 between itself and the wire separator 5. The wire separator 5 inside the wire protector groove 7 can support the enameled wire 3 and prevent the winding 4 in the wire passage groove 8 from mixing with the enameled wire 3 in the wire protector groove 7. The wire protector 6 outside the wire protector groove 7 can prevent the enameled wire 3 from being pushed out of the injection-molded skeleton 2 when subjected to the impact of the injection molding material.

[0029] The dimensions of the wire protection groove 7 are directly related to the diameter of the enameled wire 3. An excessively large wire protection groove 7 (mainly referring to its radial width) will cause the enameled wire 3 to wobble within the groove, increasing the risk of wear and breakage. Conversely, an excessively small radial width of the wire protection groove 7 will prevent the wire from passing through, and an excessively small axial height will fail to provide sufficient support and protection for the enameled wire 3. During injection molding, if the axial height of the wire protection groove 7 is insufficient, the pressure generated by injection molding may push the enameled wire 3 out of the stator frame, causing serious damage. An excessively large axial height of the wire protection groove 7 will result in wasted injection molding material and inconvenience for winding. Therefore, this utility model specifically limits the dimensions of the wire protection groove 7 according to the diameter of the enameled wire 3, specifically referring to:

[0030] The ratio of the radial width of the wire slot 7 to the diameter of the enameled wire 3 is 1-1.2, so that the enameled wire 3 can pass smoothly and be compressed, avoiding the enameled wire 3 from shaking in the wire slot 7 and avoiding abrasion. The ratio of the axial height of the wire slot 7 to the diameter of the enameled wire 3 is 1.2-2.6, which can not only protect the enameled wire 3, but also reduce material waste and facilitate winding. As shown in Figure 4 , the radial width refers to the width dimension in the figure, and the axial height refers to the height dimension in the figure. The wire slot 7 is surrounded by the wire separating plate 5 and the wire protecting plate 6, so the radial width of the wire slot 7 is the radial distance between the wire separating plate 5 and the wire protecting plate 6, and the axial height of the wire slot 7 is the minimum height of the wire separating plate 5 and the wire protecting plate 6.

[0031] Through the above size design, the enameled wire 3 can pass through the wire slot 7 safely and orderly, and can effectively protect the enameled wire 3 from injection molding impact. This protection mechanism ensures the integrity and stability of the winding 4, and improves the reliability and durability of the motor. The guiding effect of the wire slot 7 reduces the complexity and error rate of winding, and improves the production efficiency and product quality.

[0032] In this embodiment, the diameter of the enameled wire 3 is 0.5 cm, the radial width of the wire slot 7 is 0.6 cm, and the axial height is 1 cm, which can better protect the enameled wire 3. At this time, the ratio of the radial width of the wire slot 7 to the diameter of the enameled wire 3 is 6:5, and the ratio of the radial width of the wire slot 7 to the diameter of the enameled wire 3 is 2.

[0033] As shown in Figure 2 , the arc-shaped end face of the wire separating plate 5 is preferably beyond the side face of the winding part 201, avoiding the enameled wire 3 in the wire slot 7 from contacting and rubbing with the enameled wire 3 of the winding part 201.

[0034] Embodiment two

[0035] As shown in Figure 3 , the injection molding framework 2 at the end face of the tooth part 102 can form a wire passing slot 8 with the wire separating plate 5. Since the wire passing slot 8 and the wire slot 7 are both winding areas, and the enameled wire 3 in the wire slot 7 is led out from the winding slot 202, the size of the wire slot 7 also has a certain relationship with the size of the wire passing slot 8. Considering the production cost and space utilization of the motor, the size of the wire slot 7 and the size of the wire passing slot 8 need to be designed. In this embodiment, the ratio of the radial width of the wire passing slot 8 to the radial width of the wire slot 7 is 2-8, and the ratio of the axial height of the wire passing slot 8 to the axial height of the wire slot 7 is 2-8. The radial width of the wire passing slot 8 is the size a in Figure 4 , and the axial height of the wire passing slot 8 is the size b in Figure 4 . This design helps to reduce the volume of the entire motor and improve space utilization.

[0036] In a preferred embodiment, the ratio of the radial width of the through groove 8 to the radial width of the guard groove 7 is equal to the ratio of the axial height of the through groove 8 to the axial height of the guard groove 7. That is, the width and height dimensions of the through groove 8 are proportionally enlarged relative to the guard groove 7, resulting in better structural symmetry and space utilization.

[0037] In this embodiment, the dimensions of the enameled wire 3 and the wire guard groove 7 are the same as in Embodiment 1. In this embodiment, the radial width a of the wire guide groove 8 is 3cm and the axial height b is 5cm. That is, the ratio of the radial width of the wire guide groove 8 to the radial width of the wire guard groove 7, and the ratio of the axial height of the wire guide groove 8 to the axial height of the wire guard groove 7 are both 5.

[0038] In addition, to minimize the size of the insert injection-molded stator, the wire guard plate 6 and the wire separator plate 5 are positioned as close to the edge as possible. Specifically, the radially inner surface of the wire separator plate 5 is flush with the inner surface of the injection-molded skeleton 2 at the yoke 101, and the radially outer surface of the wire guard plate 6 is flush with the outer surface of the injection-molded skeleton 2 at the yoke 101. Figure 2 As shown, the inner surface of the injection-molded skeleton 2 at the yoke 101 is the first surface 9, and the outer surface of the injection-molded skeleton 2 at the yoke 101 is the second surface 10.

[0039] Example 3

[0040] Based on the above embodiments, the axial height of the separator 5 is higher than the axial height of the guard plate 6, such as... Figure 3 As shown, the winding 4 inside the wire passage 8 is relatively thick, so the wire separator 5 needs to be designed to be higher to prevent the winding 4 inside the wire passage 8 from entering the wire guard 7. The height of the wire guard 6 is relatively low, which can control the axial height of the wire guard 7.

[0041] Example 4

[0042] Based on the above embodiment, the arc length of the wire guard plate 6 is greater than the arc length of the wire separator plate 5. For example... Figure 2 As shown, the arc-shaped sides of the wire guard plate 6 approximately extend to the arc-shaped sides of the yoke 101, that is, at a distance of... Figure 2 The third surface 11 and the fourth surface 12 are close together, providing good impact protection for the enameled wire 3 within the wire protection groove 7. The wire protection plate 6 can extend continuously along the circumference or be interrupted in the middle, such as... Figure 2 As shown, the wire protection plate 6 has a notch 601 in the middle. This notch 601 will prevent the enameled wire 3 from being knocked off by impact, and at the same time, it can reduce weight.

[0043] In the description of the utility model, need understanding is, the term "length", "width", "axial direction", "radial direction", "circumferential direction" and so on indicate the position relation or positional relationship is based on the position relation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as a limitation on the utility model.

[0044] In addition, the terms "first", "second" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] In the present specification, the illustrative expressions of the terms do not necessarily refer to the same embodiment. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments in a suitable manner.

[0046] With the above ideal embodiments according to the utility model as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. An overmolding stator wire protection structure, provided at an axial end of an injection molding framework (2) outside a yoke (101), characterized in that: The wire separator plate (5) is located radially inside the wire guard plate (6) and forms a wire guard groove (7) therebetween, the ratio of the radial width of the wire guard groove (7) to the diameter of the enameled wire (3) is 1-1.2, and the ratio of the axial height of the wire guard groove (7) to the diameter of the enameled wire (3) is 1.2-2.

6.

2. The overmolded stator wire protection structure of claim 1, wherein: The injection molded framework (2) at the end face of the tooth portion (102) and the wire separator plate (5) form a wire passing groove (8), the ratio of the radial width of the wire passing groove (8) to the radial width of the wire guard groove (7) is 2-8, and the ratio of the axial height of the wire passing groove (8) to the axial height of the wire guard groove (7) is 2-8.

3. The overmolded stator wire protection structure of claim 2, wherein: The ratio of the radial width of the wire passing groove (8) to the radial width of the wire guard groove (7) is equal to the ratio of the axial height of the wire passing groove (8) to the axial height of the wire guard groove (7).

4. The overmolded stator wire protection structure of claim 3, wherein: The ratio of the radial width of the wire passing groove (8) to the radial width of the wire guard groove (7) is 5.

5. The overmolded stator wire protection structure of claim 1, wherein: The ratio of the axial height of the wire guard groove (7) to the diameter of the enameled wire (3) is 2.

6. The overmolded stator wire protection structure of claim 1, wherein: The axial height of the wire separator plate (5) is higher than the axial height of the wire guard plate (6).

7. The overmolded stator wire protection structure of claim 1, wherein: The arc-shaped end portion of the wire separator plate (5) exceeds the length of the winding portion (201) of the injection molded framework (2) by less than the circumferential length of the winding groove (202) of the injection molded framework (2).

8. The overmolded stator wire protection structure of claim 1, wherein: The arc-shaped length of the wire guard plate (6) is greater than the arc-shaped length of the wire separator plate (5).

9. The overmolded stator wire protection structure of claim 1, wherein: The radially inner side surface of the wire separator plate (5) is flush with the inner surface of the injection molded framework (2) at the yoke portion (101).

10. The overmolded stator wire protection structure of claim 1, wherein: The radially outer side surface of the wire guard plate (6) is flush with the outer surface of the injection molded framework (2) at the yoke portion (101).

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