Injection molding insulation structure of motor stator slot

Abstract

An injection molding insulation structure of a motor stator groove comprises an iron core, a plurality of stator grooves are arranged in the iron core at intervals along the circumferential direction, any stator groove is internally provided with an injection molding insulation part, and the radial cross section of the injection molding insulation part is U-shaped. At least two protruding strips are symmetrically arranged on the inner walls of the two sides of the injection molding insulating part at equal intervals, a plurality of copper wires arranged in the radial direction are arranged in any stator groove and the injection molding insulating part in a penetrating mode, and the protruding strips are located in edge gaps between the adjacent copper wires to separate and fix the copper wires. The heat conductivity coefficient of the injection molding insulating part is better than that of fiber paper, and an insulating system using the injection molding insulating part is good in heat conduction performance, heat dissipation performance and cooling performance. The copper wires are separated and fixed through the protruding strips, all the copper wires are evenly arranged, and the copper wires are prevented from being collided and rubbed with one another in the working process. The end part of the injection molding insulating part is provided with a flange which extends out of the end surface of the iron core, so that the creepage distance of a copper wire at the end part is increased.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a new energy automobile motor, and more particularly to an injection-molded insulation structure of a motor stator slot. Background Art

[0002] In the new energy vehicle drive motor, the stator slot insulation structure of the motor is part of the main insulation structure, which plays a role in improving the electrical strength of the winding in the slot, and in ensuring the insulation strength of the motor winding and the stator core when the motor is running (high temperature, voltage working conditions). At the same time, in the motor design, the slot insulation is usually extended from a part of the core to increase the creepage distance. In the slot insulation structure design of the new energy flat wire drive motor, the insulating paper is formed and used as the slot insulation structure. First, the formed insulating paper is inserted into the stator slot, and then the copper wire is inserted, and the winding (copper wire) of the entire stator core part is wrapped by the insulating paper, thereby playing an isolation role. In the prior art, the inner side of the insulating paper is a smooth plane. During the insertion of the copper wire, it is easy to rub between the copper wires, causing the paint film to be damaged, thereby causing insulation defects. In addition, fiber insulating paper is used in the prior art. The fiber insulating paper is easy to shrink after heating, resulting in the armature insulating paper being heated during the manufacturing process. The height of the insulating paper extending out of the notch is too low, resulting in a small creepage distance, which is prone to insulation failure. In addition, during the working process, the copper wire and the insulating paper are prone to friction with each other, which will cause the insulation strength of the entire insulation system to decrease, easily causing the entire insulation system to fail, the electromagnetic performance of the entire armature to be unstable, and the rigidity of the entire motor to be poor. Summary of the invention

[0003] The utility model aims to provide an injection-molded insulation structure for a motor stator slot, which aims to solve the technical problems in the prior art that copper wires are easily rubbed against each other during insertion of the copper wires, resulting in damage to the paint film, the height of the insulating paper of the armature insulating paper extending out of the slot after heating during the manufacturing process is too low, and the copper wire and the insulating paper are easily rubbed against each other during operation.

[0004] The utility model discloses an injection-molded insulating structure of a motor stator slot, comprising an iron core, wherein a plurality of stator slots are arranged at intervals along a circumferential direction in the iron core, an injection-molded insulating part is respectively arranged in any stator slot, the radial cross section of the injection-molded insulating part is U-shaped, the U-shaped openings of the injection-molded insulating part are all facing the axis of the iron core, at least two convex strips are respectively symmetrically arranged at equal intervals on the inner walls on both sides of the injection-molded insulating part, a plurality of copper wires arranged in the radial direction are penetrated in any stator slot and the injection-molded insulating part, the convex strips are located in the edge gaps of adjacent copper wires and separate and fix the copper wires.

[0005] Furthermore, the first end of any injection-molded insulating part is provided with a flange, or both the first end and the second end are provided with a flange, the flange is located on the end surface of the iron core, and the lower surface of the flange contacts the end surface of the iron core.

[0006] Furthermore, the second end of the injection-molded insulating component extends to the end surface of the core.

[0007] Compared with the prior art, the utility model has positive and obvious effects.

[0008] 1. Injection molded insulation parts are manufactured through injection molding process. Injection molded insulation parts of the same thickness are used to replace the existing fiber paper slot insulation paper to achieve one-step molding. Injection molded insulation parts are directly inserted from the inner opening of the stator slot, eliminating the insulation paper indentation molding process, which is suitable for mass production. Injection molding materials can be preferably LCP, Bakelite and other materials, which can increase the insulation strength of the entire armature and enhance the electromagnetic performance.

[0009] The raw material of injection molded insulation parts is injection plastic. The material stiffness and texture are stronger than fiber paper. After wrapping the copper wire, the overall winding rigidity is better, and the power density and NVH performance are better.

[0010] The thermal conductivity of injection molded insulation is better than that of fiber paper. The insulation system using injection molded insulation has better thermal conductivity, heat dissipation and cooling performance.

[0011] 2. The inner wall of the injection-molded insulating part is designed with convex strips, which are similar in shape and size to the winding copper wires. The convex strips are located in the edge gaps between the copper wires. The copper wires are separated and fixed by the convex strips, and each copper wire is evenly arranged to ensure uniform gaps between the copper wires, prevent the copper wires from rubbing against each other during operation, increase insulation strength, and improve electrical performance.

[0012] Guide grooves are formed between adjacent convex strips, and each guide groove can accommodate a copper wire. When the copper wire is inserted into the insulating paper, it is guided by the convex strips of the insulating paper. All copper wires are evenly arranged through the guide grooves, and the gaps between the copper wires in the stator slots are uniform, preventing the copper wires from being scratched and damaged, and preventing the bent copper wires from rubbing against each other and causing damage to the paint film, thereby reducing insulation failure caused by scratches.

[0013] 3. The end of the injection molded insulation is provided with a flange, which extends out of the end face of the core to increase the creepage distance of the copper wire at the end. The injection molded glue shrinks less than the fiber paper after heating, and the flange can also prevent the insulation paper on the rear end face from shrinking after the armature is heated.

[0014] 4. A flange can be set at one end of the injection-molded insulating part, but not at the other end. Instead, a conventional extension and extension notch can be used to reduce the difficulty of process manufacturing while ensuring the insulation performance of the insulating paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a three-dimensional schematic diagram of an injection-molded insulation structure of a motor stator slot according to the utility model.

[0016] Figure 2 It is a schematic diagram of an injection-molded insulating part in an injection-molded insulating structure of a motor stator slot according to the utility model, in which flanges are arranged at both ends.

[0017] Figure 3 It is a schematic diagram of an injection-molded insulating member in an injection-molded insulating structure of a motor stator slot according to the utility model, in which a flange is provided at one end and no flange is provided at the other end.

[0018] Figure 4 It is a partial top view schematic diagram of an injection-molded insulation structure of a motor stator slot according to the utility model.

[0019] Figure 5 It is a partial three-dimensional schematic diagram of an injection-molded insulation structure of a motor stator slot according to the utility model.

[0020] Figure 6 The utility model is a cross-sectional schematic diagram of an injection-molded insulation structure of a motor stator slot.

[0021] Figure 7 It is a front view schematic diagram of an injection-molded insulation structure of a motor stator slot according to the utility model. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0023] like Figure 1-Figure 7 As shown, the utility model is an injection-molded insulation structure of a motor stator slot, comprising an iron core 1, in which a plurality of stator slots 2 are arranged at intervals along the circumferential direction, an injection-molded insulating part 3 is respectively arranged in any stator slot 2, the radial cross-section of the injection-molded insulating part 3 is U-shaped, the U-shaped openings of the injection-molded insulating part 3 are all facing the axis of the iron core 1, at least two convex strips 4 are respectively symmetrically arranged at equal intervals on the inner walls on both sides of the injection-molded insulating part 3, a plurality of copper wires 6 arranged in the radial direction are penetrated in any stator slot 2 and the injection-molded insulating part 3, and the convex strips 4 are located in the edge gaps of adjacent copper wires 6 to separate and fix the copper wires 6.

[0024] Furthermore, the first end of any injection-molded insulating part 3 is provided with a flange 5 or both the first end and the second end are provided with a flange 5 , the flange 5 is located on the end surface of the core 1 , and the lower surface of the flange 5 contacts the end surface of the core 1 .

[0025] Furthermore, the second end of the injection-molded insulating member 3 extends to the end surface of the iron core 1 .

[0026] Specifically, the iron core 1, the stator slots 2, the copper wires 6, etc. in this embodiment all adopt well-known solutions in the prior art, which are well understood by those skilled in the art and will not be described in detail here.

[0027] The working principle of this embodiment:

[0028] 1. The injection molded insulating part 3 is manufactured by an injection molding process. The injection molded insulating part 3 of the same thickness is used to replace the existing slot insulating paper in the fiber paper method to achieve one-step molding. The injection molded insulating part 3 is directly inserted from the inner opening of the stator slot 2, eliminating the insulating paper indentation molding process, and is suitable for mass production. The injection molding material can preferably be LCP, bakelite and other materials, which can increase the insulation strength of the entire armature and enhance the electromagnetic performance.

[0029] The injection-molded insulating part 3 is made of injection-molded plastic, and the material has stronger stiffness and texture than fiber paper. After wrapping the copper wire 6, the rigidity of the overall winding is better, and the power density and NVH performance are better.

[0030] The thermal conductivity of the injection-molded insulating member 3 is better than that of the fiber paper, and the insulation system using the injection-molded insulating member 3 has better thermal conductivity, heat dissipation and cooling performance.

[0031] 2. A convex strip 4 is designed on the inner wall of the injection-molded insulating part 3, and its shape and size are similar to those of the winding copper wire 6. The convex strip 4 is located in the edge gap between the copper wires 6. The copper wires 6 are separated and fixed by the convex strip 4, and each copper wire 6 is evenly arranged to ensure that the gaps between the copper wires 6 are uniform, thereby preventing the copper wires 6 from rubbing against each other during operation, increasing the insulation strength, and improving the electrical performance.

[0032] Guide grooves are formed between adjacent convex strips 4, and each guide groove can accommodate a copper wire 6. When the copper wire 6 is inserted into the insulating paper, it is guided by the convex strips 4 of the insulating paper. All copper wires 6 are evenly arranged through the guide grooves, and the gaps between the copper wires 6 in the stator slots 2 are uniform, preventing the copper wires 6 from being scratched and damaged by each other, and preventing the bent copper wires 6 from rubbing against each other to cause damage to the paint film, thereby reducing insulation failure caused by scratches.

[0033] 3. The end of the injection molded insulating part 3 is provided with a flange 5, which extends out of the end face of the iron core 1 to increase the creepage distance of the end copper wire 6. The injection molded adhesive shrinks less than the fiber paper after being heated, and the flange 5 can also prevent the insulation paper on the rear end face from shrinking after the armature is heated.

[0034] 4. A flange 5 may be provided at one end of the injection-molded insulating part 3, while the other end may not be provided with a flange 5, and a conventional extension and extension notch may be adopted to reduce the difficulty of process manufacturing while ensuring the insulation performance of the insulating paper.

Claims

1. An injection molded insulation structure of a motor stator slot, comprising an iron core, wherein a plurality of stator slots are arranged at intervals along a circumferential direction in the iron core, characterized in that : An injection-molded insulating part is respectively arranged in any stator slot, and the radial cross-section of the injection-molded insulating part is U-shaped, and the U-shaped openings of the injection-molded insulating part are all facing the axis of the iron core. At least two convex strips are respectively symmetrically arranged at equal intervals on the inner walls on both sides of the injection-molded insulating part. A plurality of copper wires arranged in the radial direction are penetrated in any stator slot and the injection-molded insulating part, and the convex strips are located in the edge gaps of adjacent copper wires to separate and fix the copper wires.

2. The injection-molded insulation structure of a motor stator slot according to claim 1, characterized in that: The first end of any injection-molded insulating part is provided with a flange, or both the first end and the second end are provided with a flange, the flange is located on the end surface of the iron core, and the lower surface of the flange contacts the end surface of the iron core.

3. The injection-molded insulation structure of a motor stator slot according to claim 2, characterized in that: The second end of the injection-molded insulating part extends to the end surface of the iron core.

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