Motor stator core

Abstract

The utility model specifically discloses a motor stator iron core, the motor stator iron core comprises a plurality of stator single sheets which are arranged in a laminated manner, a solid bonding layer is arranged between the adjacent stator single sheets, and the solid bonding layer is made of an insulating material. Compared with traditional liquid glue, the solid bonding layer can preliminarily fix the stator single pieces, the lamination precision of the stator single pieces is adjusted before later curing, the possibility of displacement or dislocation of the stator single pieces is remarkably reduced, and therefore the production difficulty is reduced; the thickness of each solid-state bonding layer can be consistent, the solid-state bonding layers are not easy to flow, each layer of stator single sheets can be horizontally stacked, and the difficulty of the manufacturing process of the stator core is reduced. Moreover, the solid bonding layer does not damage the surface coating of the stator single sheet, plays a good isolation role, controls the eddy current on the cross section of each stator single sheet, reduces the iron loss, and improves the motor energy conversion efficiency of the motor stator.

Description

Technical Field

[0001] The present application relates to the technical field of motor components, and more specifically, to a motor stator core. Background Art

[0002] The motor stator is an important part of the generator, generally composed of three parts: stator core, stator winding and frame. The function of the stator is to generate a rotating magnetic field, and the rotor is cut by the magnetic lines of force in the rotating magnetic field to generate output current.

[0003] The stator core is generally formed by stacking and connecting multiple stator monolithic sheets. In the related art, the stator core can be welded by stacking multiple stator laminations of the same shape with a stacking jig. However, as the thickness of the stator monolithic sheets is getting thinner and thinner, welding requires high positioning accuracy of the stator monolithic sheets and high difficulty of welding process, which can easily lead to problems such as displacement and misalignment, resulting in the performance degradation of the motor stator. Utility Model Content

[0004] In order to overcome the problems of high process difficulty and reduced electrical performance of the current stator core forming technology, the present application provides a motor stator core.

[0005] The present application provides a motor stator core, which adopts the following technical solution:

[0006] A motor stator core comprises a plurality of stacked stator monoliths, wherein a solid bonding layer is arranged between adjacent stator monoliths, and the solid bonding layer is made of insulating material.

[0007] By adopting the above technical solution, the solid bonding layer is a solid bonding film, which can form a preliminary fixed bond between the stator monoliths, and the stacked stator monoliths can form a whole before curing. The position of each stator monolith is adjusted before subsequent complete curing, and the notch of each stator monolith can be accurately positioned, which significantly reduces the possibility of displacement or misalignment of the stator monoliths; the solid bonding layer is cross-linked during the subsequent baking and curing process, which enhances the connection strength between adjacent stator monoliths, thereby effectively increasing the overall reliability of the motor stator core;

[0008] Compared with traditional liquid glue, the thickness of the solid adhesive layer of the present application is controllable, the thickness of each solid adhesive layer can be made consistent, and it is not easy to flow. Each layer of stator monoliths can be stacked horizontally, and the manufacturing process difficulty of the stator core is reduced. In addition, the solid adhesive layer will not damage the surface coating of the stator monolith, and has a good isolation effect, controlling the eddy current on the cross section of each stator monolith, reducing iron loss, and thus improving the motor energy conversion efficiency of the motor stator.

[0009] Furthermore, the thermal conductivity of the solid adhesive layer is ≥5 W / (m·K).

[0010] By adopting the above technical solution, heat-conducting fillers are added to the solid adhesive layer, so that the solid adhesive layer can have good thermal conductivity and does not affect the connection strength of the solid adhesive layer to the stator single piece.

[0011] Furthermore, the thickness of the solid bonding layer is 0.015 mm, and the thickness of the stator single piece is 0.35±0.005 mm.

[0012] By adopting the above technical solution, the thickness of the solid adhesive layer and the thickness range of the stator monolith are controlled, so that the solid adhesive layer can play a good spacing role, prevent the burrs of the stator monolith from penetrating the solid adhesive layer, reduce the possibility of stator core connection, thereby reducing the eddy current loss of the core and improving the electrical performance of the motor stator; and can also make the increase in the resistance value between the stator monolithic layers relatively low, and have almost no effect on the overall iron loss of the motor stator, thereby having almost no effect on the motor energy conversion efficiency of the motor stator.

[0013] Furthermore, the stator monolith includes a yoke and a tooth portion integrally formed with the yoke, the yoke is in a circular ring shape, a plurality of the tooth portions are provided, two adjacent tooth portions form a stator slot, and the slot width of the stator slot gradually decreases in the direction away from the yoke.

[0014] Furthermore, the included angle between the central axes of two adjacent teeth is 30°.

[0015] By adopting the above technical solution, under the premise of ensuring the overall strength of the motor stator core, the slot width is gradually reduced, and the number of teeth is controlled by controlling the size of the tooth axis angle, thereby reducing the number of stator slots, maximizing the use of stator slot space, and improving the slot fill rate of the stator core. At the same time, due to the high thermal conductivity of the solid adhesive layer, the heat dissipation effect is good, and the contact surface with the wire group is large, it can solve the heat dissipation problem caused by the high slot fill rate.

[0016] Furthermore, the stator slot has an opening angle of 30°.

[0017] Furthermore, the tooth portion includes a tooth boot and a tooth body integrally formed with the tooth boot, the tooth body is connected to the yoke portion, the tooth boot is located on a side of the tooth body away from the yoke portion, and a reinforcement portion is provided between the tooth boot and the tooth body.

[0018] Furthermore, the included angle formed by the reinforcement parts located on both sides of the same stator slot is 120°.

[0019] By adopting the above technical solution and providing the reinforcement part, the connection strength between the tooth body and the tooth shoe can be strengthened without affecting the full slot rate of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the overall structure of the stator core of the motor in Example 1.

[0021] Figure 2 It is a side view of the overall structure of the stator core of the motor in Example 1.

[0022] Reference numerals:

[0023] 1. stator monolith; 11. yoke; 12. tooth; 13. stator slot; 14. tooth shoe; 15. tooth body; 16. reinforcement; 2. solid bonding layer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer, the device proposed in the utility model is further described in detail below in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so it has no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should fall within the scope of the technical content disclosed by the utility model.

[0025] Example

[0026] Example 1

[0027] Figure 1 This is a front view of the overall structure of the stator core of the motor in Example 1. Figure 2 FIG. 1 is a side view of the overall structure of the stator core of the motor of Example 1. Figure 1 and Figure 2The motor stator includes a plurality of stacked stator monoliths 1, which are coaxially arranged. A solid adhesive layer 2 is arranged between adjacent stator monoliths 1, wherein the thickness of the stator monolith 1 is 0.35±0.005mm, and the thickness of the solid adhesive layer 2 is 0.015mm. The surface of the solid adhesive layer 2 has a certain viscosity, which can infiltrate the surface of the stator monolith 1 and play a role in preliminary bonding. When all the stator monoliths 1 are bonded, the bonding of the stator monolith 1 is adjusted to ensure that the edges of the multiple stator monoliths 1 can be completely overlapped, thereby reducing the possibility of displacement and misalignment of the stator monolith 1. The solid adhesive layer can be a prepolymer resin glue, which can be slightly deformed and filled in the gap between two adjacent stator monoliths 1. A cross-linking reaction occurs during the later curing process, and the motor stator core is firmly bonded to improve the reliability of the motor stator core.

[0028] See also Figure 1 The stator monolith 1 includes a circular ring-shaped yoke 11, and the yoke 11 has a tooth portion 12 extending in the direction of the center of the circle, and the tooth portion 12 is integrally formed with the yoke 11. The tooth portion 12 includes a tooth shoe 14 and a tooth body 15 integrally formed with the tooth shoe 14, and the tooth body 15 is connected to the yoke 11. The tooth shoe 14 is located on the side of the tooth body 15 away from the yoke 11, and a reinforcement portion 16 is provided between the tooth shoe 14 and the tooth body 15. A plurality of tooth portions 12 are provided, and two adjacent tooth portions 12 form a stator slot 13. The angle between the central axes of the two adjacent tooth portions 12 is 30°, and the slot angle of the stator slot 13 is 30°. The angle formed by the reinforcement portions 16 on both sides of the same stator slot 13 is 120°. The slot width of the stator slot 13 gradually decreases in the direction toward the slot, and the wire group is wound on the tooth portion 12 and is located in the stator slot 13. The slot opening angle and slot width of the slot opening are adjusted. Moreover, since the teeth 12 are evenly distributed on the yoke 11, the number of the teeth 12 is controlled by controlling the size of the axis angle of the teeth 12, thereby reducing the number of stator slots 13, maximizing the use of the space of the stator slots 13, and improving the slot fill rate of the stator core. In addition, by setting the reinforcement part 16, the connection strength between the tooth body 15 and the tooth shoe 14 is strengthened without affecting the stator core slot fill rate, thereby improving the overall connection strength of the tooth 12.

[0029] See also Figure 1, the solid adhesive layer 2 can be a prepolymer resin, and a thermally conductive filler, such as boron nitride, is added to the prepolymer resin. The higher the amount of thermally conductive filler added in the solid adhesive layer 2, the higher the thermal conductivity. When the thermal conductivity of the solid adhesive layer 2 is ≥5W / (m·K), the solid adhesive layer 2 can have good thermal conductivity while not affecting the connection strength of the solid adhesive layer 2 to the stator monolith 1. The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] Moreover, the above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A motor stator core, characterized in that: It comprises a plurality of stacked stator monoliths (1), wherein a solid bonding layer (2) is arranged between adjacent stator monoliths (1), and the solid bonding layer (2) is made of insulating material.

2. A motor stator core as claimed in claim 1, characterized in that: The thermal conductivity of the solid adhesive layer (2) is ≥5 W / (m·K).

3. The motor stator core according to claim 1, characterized in that: The thickness of the solid bonding layer (2) is 0.015 mm, and the thickness of the stator monolith (1) is 0.35±0.005 mm.

4. A motor stator core as claimed in claim 1, characterized in that: The stator monolith (1) comprises a yoke (11) and a tooth (12) integrally formed with the yoke (11); the yoke (11) is in a circular ring shape; a plurality of the tooth (12) are provided; two adjacent tooth portions (12) form a stator slot (13); and the slot width of the stator slot (13) gradually decreases in a direction away from the yoke (11).

5. A motor stator core as claimed in claim 4, characterized in that: The included angle between the central axes of two adjacent tooth portions (12) is 30°.

6. A motor stator core as claimed in claim 4, characterized in that: The stator slot (13) has a slot opening angle of 30°.

7. A motor stator core as claimed in claim 4, characterized in that: The tooth portion (12) comprises a tooth shoe (14) and a tooth body (15) integrally formed with the tooth shoe (14); the tooth body (15) is connected to the yoke portion (11); the tooth shoe (14) is located on a side of the tooth body (15) away from the yoke portion (11); and a reinforcement portion (16) is provided between the tooth shoe (14) and the tooth body (15).

8. A motor stator core as claimed in claim 7, characterized in that: The included angle formed by the reinforcement parts (16) located on both sides of the same stator slot (13) is 120°.

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