Large-span slot insulation structure for inner slots of concentric windings

Abstract

The utility model relates to the related technical field of motors, in particular to a concentric winding inner slot large-span slot insulation structure, which comprises an annular cover plate, and a plurality of tooth covers are uniformly distributed on the inner side surface of the annular cover plate at intervals; a side baffle is arranged at the inner side end of each tooth cover, and the top of each side baffle is bent outwards in the radial direction to form a hook plate. The whole side baffle plate and the hook plate form a hook structure, and the hook plate has a blocking effect on an enameled wire during winding, so that the enameled wire is effectively prevented from easily loosening and sliding off from the side baffle plate; therefore, when the groove insulation structure is applied to the rotary transformer motor, winding equipment with tension can be adopted for winding, and the winding efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the relevant technical field of motors, and in particular to a slot insulation structure with a large span in a concentric winding inner slot. Background Art

[0002] In order to ensure high-precision output performance, the key component of high-precision resolver motors, the stator armature, often adopts a concentric winding inner slot structure.

[0003] The slot insulation structure is an important component in the motor. In the prior art, for example, the patent with the announcement number CN220043089U discloses a stator coil with a moisture-proof insulation structure. In this patent, the insulation skeleton covers the two end faces of the stator core. Another example is a motor stator insulation structure with the announcement number CN219499075U, in which the skeleton is formed on the core by injection molding. The skeleton includes an upper end cover, a lower end cover and at least one rib. The inner wall of the upper end cover is provided with a plurality of first tooth covers at intervals. Similarly, the inner wall of the lower end cover is provided with a plurality of second tooth covers at intervals. Another example is a stator winding insulation structure of a concentrated winding with the announcement number CN220022450U, in which the insulation end plate includes a body, and the inner side of the body is provided with twelve insulation plates evenly distributed along the inner wall of the body, and insulation teeth are provided at both ends of the insulation plate.

[0004] In the above-mentioned prior art, the inner side ends of the tooth covers of the slot insulation structure are all provided with side baffles, but the side baffles are all straight plate structures. It is not suitable for resolver motors. The resolver stator armature winding is a concentric winding inner slot structure, and the maximum outer circle span of the concentric winding reaches 1 / 2 turn of the iron core, which belongs to a large span winding. At present, the concentric winding inner slot structure armature in the industry is manually operated, and the high-precision motor has high requirements for the precision of the winding enameled wire, and the wire diameter is relatively thin, generally not more than φ0.1mm. The manual processing is uneven, resulting in poor consistency of coil resistance and low processing efficiency. Quality problems often occur due to damage to the enameled wire paint and incorrect number of coil turns. Therefore, winding equipment is needed for winding. However, when using tension winding equipment, the enameled wire is easily loosened and slipped from the side baffle position due to the influence of tension. Therefore, if the resolver motor adopts the slot insulation structure in the prior art, it cannot be wound with tension winding equipment, and there is a problem of low winding efficiency. Utility Model Content

[0005] The main purpose of the utility model is to provide a slot insulation structure with a large span in the inner slot of a concentric winding, which is suitable for a resolver motor and aims to solve the problem that the enameled wire in the slot insulation structure in the prior art is easily loosened and slipped from the side baffle position.

[0006] To achieve the above-mentioned purpose, the utility model proposes a slot insulation structure with a large span in a concentric winding inner slot, comprising an annular cover plate, on the inner side surface of which a plurality of tooth covers are evenly spaced; a side baffle plate is arranged at the inner end of each tooth cover, and the top of the side baffle plate is bent radially outward to form a hook plate.

[0007] Preferably, the width of the hook plate is b; the width of the side baffle is B; and the two satisfy:

[0008] Preferably, the hook plate extends radially outward by a length of t; the tooth cover has a length of T; and both satisfy:

[0009] Preferably, an empty slot is formed in the interval between two adjacent tooth covers, and an insert block is formed by extending downward along the edge of each empty slot, and the insert block is used to be inserted into the tooth slot between two adjacent stator teeth on the iron core; the insert block and the side baffle are respectively located on the upper and lower sides of the tooth cover; and a winding groove is provided in the insert block.

[0010] Preferably, the height of the plug is h, which satisfies: Where: h is the thickness of the core used in conjunction with the slot insulation structure.

[0011] Preferably, the two side surfaces of the side baffle are flat surfaces; a gap is provided on the plug block, and the two side surfaces of the gap correspond to the coplanar flat surfaces on the side baffle respectively; when the slot insulation structure is installed on the iron core, the flat surface of the side baffle is coplanar with the two side surfaces of the inner end of the stator tooth.

[0012] Preferably, the inner side surface of the side baffle is an arc-shaped surface, the diameter of which is the same as the diameter of the inner side surface of the stator tooth on the iron core; when the slot insulation structure is installed on the iron core, the arc-shaped surface is coplanar with the inner side surface of the stator tooth.

[0013] Preferably, the top surface of the hook plate is flush with the top surface of the side baffle plate, and both ends of the top surface of the side baffle plate are provided with rounded corners, which smoothly transition to the edges on both sides of the hook plate.

[0014] Preferably, the slot insulation structure is an integrated structure formed by integral injection molding of polyetherimide material.

[0015] Preferably, the number of the tooth covers is 24.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows:

[0017] (1) In the utility model, the top of the side baffle is bent radially outward to form a hook plate, so that the entire side baffle and the hook plate form a hook structure. When winding, the hook plate forms a blocking effect on the enameled wire, effectively preventing the enameled wire from loosening and sliding off the side baffle. Therefore, when the slot insulation structure is applied to the resolver motor, a tension winding device can be used for winding, which greatly improves the winding efficiency.

[0018] (2) In the present invention, by designing the width of the hook plate and the side baffle, the connection strength between the hook plate and the side baffle can be guaranteed, while at the same time, the hook plate being too wide can be prevented from interfering with the winding equipment during winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 The three-dimensional structure of the slot insulation structure provided by the utility model Figure 1 ;

[0021] Figure 2 The three-dimensional structure of the slot insulation structure provided by the utility model Figure 2 ;

[0022] Figure 3 A top view of the slot insulation structure provided by the utility model;

[0023] Figure 4 A bottom view of the slot insulation structure provided by the utility model;

[0024] Figure 5 This is a structural schematic diagram of the slot insulation structure provided by the utility model that is about to be transferred to the iron core;

[0025] Figure 6 A schematic diagram of the slot insulation structure and the iron core provided by the utility model after assembly;

[0026] Figure 7 Schematic diagram of the concentric winding of the stator in a resolver motor.

[0027] Explanation of the accompanying drawings: 1. annular cover plate; 2. tooth cover; 3. side baffle plate; 3a. arc surface; 3b. flat surface; 3c. rounded corners; 4. hook plate; 5. empty slot; 6. plug-in block; 6a. winding slot; 6b. gap; 7. iron core; 7a. stator teeth. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] Combination Figure 1 , Figure 2 As shown, a slot insulation structure with a large span in the inner slot of a concentric winding includes an annular cover plate 1, and a plurality of tooth covers 2 are evenly spaced on the inner side surface of the annular cover plate 1; a side baffle plate 3 is provided at the inner end of each tooth cover 2, and the top of the side baffle plate 3 is bent outward along the radial direction to form a hook plate 4. Specifically, the hook plate 4 and the side baffle plate 3 together form a hook structure, and the hook plate 4, the side baffle plate 3 and the tooth cover 2 together form a U-shaped slot structure with an outer opening. When winding, the hook plate 4 forms a blocking effect on the enameled wire, effectively preventing the enameled wire from loosening and sliding off from the side baffle plate 3.

[0031] In this embodiment, the entire slot insulation structure is an integrated structure formed by integral injection molding of polyetherimide material. The model of polyetherimide material is PEI100HI. Polyetherimide is a high-performance engineering plastic with good dimensional stability. It can maintain dimensional stability even in an environment with large temperature changes. It has a high glass transition temperature and can maintain stable physical properties in a high temperature environment. It has good resistance to a variety of chemical substances and can be used in harsh chemical environments. It has low flammability and a high flame retardant grade, which can meet applications with high safety requirements. It has good electrical insulation performance.

[0032] Combination Figure 1 As shown, the width of the hook plate 4 is b; the width of the side baffle 3 is B; in this embodiment, in order to improve the connection strength between the hook plate 4 and the side baffle 3, the width of the hook plate 4 is required to be not less than one-third of the width of the side baffle 3. In addition, in order to ensure the spacing between two adjacent hook plates 4 to facilitate the winding operation and avoid the hook plate 4 being too wide to interfere with the winding equipment during winding, the width of the hook plate 4 is required to be not more than half of the width of the side baffle 3. Therefore, the width of the hook plate 4 is b and the width of the side baffle 3 is B, which both meet the following conditions:

[0033] Combination Figure 1 , Figure 2 As shown, the interval between two adjacent tooth covers 2 forms an empty slot 5, and an insert block 6 is formed at the edge of each empty slot 5 and extends downward along the profile. The insert block 6 is used to be inserted into the tooth slot between two adjacent stator teeth 7a on the iron core 7; the insert block 6 and the side baffle 3 are respectively located at the upper and lower sides of the tooth cover 2; the insert block 6 is provided with a winding slot 6a, and the winding slot 6a is connected to the empty slot 5. When winding, the enameled wire is passed through the winding slot 6a.

[0034] Combination Figure 3 As shown, the length of the hook plate 4 extending radially outward is t; the length of the tooth cover 2 is T; during winding, in order to ensure that the hook plate 4 can form a blocking effect on the enameled wire, the length of the hook plate 4 cannot be too short, so the length t of the hook plate 4 is set to be no less than one-third of the length of the tooth cover 2. In addition, if the length t of the hook plate 4 is too long, it is easy to interfere with the winding equipment during winding, so the length t of the hook plate 4 is set to be no more than one-half of the length of the tooth cover 2, so the length t of the hook plate 4 and the length T of the tooth cover 2 both meet:

[0035] Combination Figure 2 and Figure 5 As shown, the height of the plug 6 is h, which satisfies: Wherein: H is the thickness of the iron core 7 used in conjunction with the slot insulation structure. When the slot insulation structure is in use, two slot insulation structures are respectively installed at both ends of the iron core 7, and the plug 6 is inserted into the tooth slot between two adjacent stator teeth 7a on the iron core 7. In order to ensure that the end faces of the plugs 6 on the two slot insulation structures are in contact with each other, the height h of the plug 6 is required to be equal to half of the thickness of the iron core 7.

[0036] Combination Figure 2 , Figure 5 and Figure 6 As shown, the two side surfaces of the side baffle 3 are flat surfaces 3b; a gap 6b is provided on the plug block 6, and the two side surfaces of the gap 6b correspond to the flat surfaces 3b on the side baffle 3 and are coplanar; when the slot insulation structure is installed on the iron core, the flat surface 3b of the side baffle 3 and the two side surfaces of the inner side end of the stator tooth 7a ( Figure 5 The C surface in the figure is coplanar. Figure 6 This is a schematic diagram of the slot insulation structure and the iron core after assembly. Figure 6 It can be seen that after assembly, the side surface of the gap 6b, the flat surface 3b of the side baffle 3, and the side surface of the inner end of the stator tooth 7a are coplanar, avoiding interference with the winding caused by the presence of steps.

[0037] Combination Figure 2 , Figure 6As shown, the inner side surface of the side baffle 3 is an arc surface 3a, and the diameter of the arc surface 3a is the same as the diameter of the inner side surface of the stator tooth on the iron core; when the slot insulation structure is installed on the iron core, the arc surface 3a is coplanar with the inner side surface of the stator tooth, so that the slot insulation structure and the inner surface of the assembly formed by the iron core 7 are on the same circumferential surface.

[0038] Combination Figure 1 As shown, the top surface of the hook plate 4 is flush with the top surface of the side baffle 3, and both ends of the top surface of the side baffle 3 are provided with rounded corners 3c, which smoothly transition to the edges on both sides of the hook plate 4. The rounded corners 3c are provided to guide the enameled wire during winding, so that the enameled wire can smoothly enter the gap between two adjacent side baffles 3.

[0039] In this embodiment, the number of the gear covers 2 is 24, the number of the corresponding side baffles 3 is also 24, and the number of the insert blocks 6 is also 24.

[0040] When the slot insulation structure is applied to the resolver motor, the winding can be performed using a tension winding device, which greatly improves the winding efficiency. In the resolver motor, two slot insulation structures are installed at both ends of the iron core 7, and the stator structure is formed by winding the enameled wire in a concentric winding manner. Figure 7 shown.

[0041] When using concentric windings, there are the following options for the preliminary design of the slot insulation structure:

[0042] Solution a: The cross-wire blocking structure is designed on the outer ring of the winding. If the cross-wire blocking position is designed on the outer ring of the winding end, the cross-wire will interfere with the inner wall of the casing where the outer circle of the iron core 7 is pressed, and when the stator armature is installed in the casing, the winding cross-wire will be scratched. Therefore, this solution a is only suitable for coil windings with fewer cross-wires.

[0043] Solution b: The cross-wire retaining structure is designed in the inner circle of the winding. If the cross-wire retaining position is designed in the inner circle of the winding, there will be no interference between the outer circle and the inner wall of the housing to be installed. However, if it is designed in the inner circle, the cross-wire may be loosened to the inner circle, resulting in the risk of coil falling off, sweeping, and wire breaking.

[0044] Therefore, in combination with solution b, in this embodiment, the side baffle 3 is arranged at the inner end of the gear cover 2, and the top of the side baffle 3 is bent radially outward to form a hook plate 4. The side baffle 3 and the hook plate 4 form a hook structure, which is used as a cross-line blocking structure.

[0045] Through physical verification, after the slot insulation structure provided in this embodiment is assembled with the iron core, winding equipment is used for winding, and the situation after winding is shown in Table 1 below.

[0046] Table 1 Physical verification of the slot insulation structure winding provided in this embodiment

[0047]

[0048] Through verification, the slot insulation structure provided in this embodiment realizes efficient winding while achieving effective insulation between the iron core and the coil, and improves the consistency and quality stability of the precision motor coil. Therefore, the slot insulation structure is effective and feasible for high-precision resolver motors.

[0049] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made under the concept of the present invention using the contents of the specification and drawings of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A slot insulation structure with a large span in a concentric winding inner slot, comprising an annular cover plate (1), a plurality of tooth covers (2) being evenly spaced on the inner side surface of the annular cover plate (1); a side baffle (3) being arranged at the inner end of each tooth cover (2), characterized in that: The top of the side baffle plate (3) is bent outwardly along the radial direction to form a hook plate (4).

2. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 1, characterized in that: The width of the hook plate (4) is b; the width of the side baffle plate (3) is B; the two satisfy:

3. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 1, characterized in that: The hook plate (4) has a length t extending outward in the radial direction; the tooth cover (2) has a length T; and the two satisfy:

4. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 1, characterized in that: An empty slot (5) is formed at the interval between two adjacent tooth covers (2), and an insert block (6) is formed by extending downward along the edge of each empty slot (5). The insert block (6) is used to be inserted into the tooth slot between two adjacent stator teeth on the iron core; the insert block (6) and the side baffle (3) are respectively located on the upper and lower sides of the tooth cover (2); and a winding slot (6a) is provided in the insert block (6).

5. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 4, characterized in that: The height of the plug (6) is h, which satisfies: Where: H is the thickness of the core used in conjunction with the slot insulation structure.

6. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 4, characterized in that: The two side surfaces of the side baffle (3) are flat surfaces (3b); a gap (6b) is provided on the plug block (6), and the two side surfaces of the gap (6b) are coplanar with the flat surfaces (3b) on the side baffle (3) respectively corresponding to the two side surfaces; when the slot insulation structure is installed on the iron core, the flat surface (3b) of the side baffle (3) is coplanar with the two side surfaces of the inner end of the stator tooth.

7. A concentric winding inner slot insulation structure with a large slot span as claimed in claim 1, characterized in that: The inner side surface of the side baffle (3) is an arc-shaped surface (3a), the diameter of which is the same as the diameter of the inner side surface of the stator teeth on the iron core; when the slot insulation structure is installed on the iron core, the arc-shaped surface (3a) is coplanar with the inner side surface of the stator teeth.

8. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 1, characterized in that: The top surface of the hook plate (4) is flush with the top surface of the side baffle (3), and both ends of the top surface of the side baffle (3) are provided with chamfered corners (3c), which smoothly transition to the edges on both sides of the hook plate (4).

9. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 1, characterized in that: The slot insulation structure is an integrated structure formed by integral injection molding of polyetherimide material.

10. A concentric winding inner slot with a large span slot insulation structure as claimed in claim 4, characterized in that: The number of the tooth covers (2) is 24.

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