Driving motor stator winding insulation structure

Abstract

A driving motor stator winding insulation structure comprises an iron core, a stator groove is arranged in the iron core, a groove insulation layer is arranged on the groove wall of the stator groove, a single-strand conductor and a multi-strand conductor are arranged in the stator groove, the single-strand conductor is composed of a first wire, the first wire is wrapped by a single-strand conductor turn-to-turn insulation layer, and the multi-strand conductor is wrapped by a multi-strand conductor turn-to-turn insulation layer. The outer side of the multi-strand conductor is wrapped with a multi-strand conductor turn-to-turn insulating layer, the multi-strand conductor comprises at least two second wires, and the sectional area of the second wires is smaller than that of the first wires. According to the utility model, the multi-strand conductor is used for replacing a single-strand conductor, and the sectional area of each second wire of the multi-strand conductor is smaller than that of the first wire, so that the skin effect is reduced. The inter-turn potential difference between the second wires of the multi-strand conductor is isolated through the strand insulating layer, the multi-strand conductor and the single-strand conductor are isolated through the multi-strand conductor inter-turn insulating layer and the single-strand conductor inter-turn insulating layer, and therefore the proximity effect is reduced.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to a motor stator, and in particular to an insulating structure of a stator winding of a driving motor. Background Art

[0002] With the rapid development of the electric vehicle industry, the market's requirements for vehicle range have increased, and new energy vehicle manufacturers have also put forward requirements for drive motor manufacturers to improve efficiency. Improving motor efficiency can reduce the energy loss of the vehicle, allowing new energy vehicles to travel longer distances after each charge, reducing the charging frequency, and improving user convenience and satisfaction. In the prior art, new energy drive motors use a single-turn single-strand winding structure. Due to the existence of skin effect and proximity effect, the single-turn single-strand winding structure has higher AC losses, which are particularly obvious at the conductor near the slot, making it difficult to improve efficiency and the motor efficiency is low.

[0003] The skin effect refers to the phenomenon that the distribution of AC current in a conductor tends to the surface of the conductor. This is because the magnetic field generated by the AC current induces eddy currents inside the conductor. These eddy currents are opposite to the original current direction, which reduces the current density in the center of the conductor and increases the current density on the surface. Therefore, the skin effect reduces the effective cross-sectional area of ​​the conductor, increases the resistance, and leads to increased energy loss. The proximity effect occurs between adjacent conductors. When the current in one conductor changes, an induced electromotive force is generated in the adjacent conductor, thereby changing its current distribution. Summary of the invention

[0004] The utility model aims to provide a stator winding insulation structure for a driving motor, which is intended to solve the technical problem in the prior art that the motor efficiency is difficult to improve due to the skin effect and the proximity effect of the winding structure.

[0005] The utility model discloses a driving motor stator winding insulation structure, comprising an iron core, wherein a plurality of stator slots are arranged in a circumferential direction in the iron core, a slot insulation layer is arranged on the wall of any of the stator slots, at least one single-strand conductor and at least one multi-strand conductor are arranged in each of the stator slots, any of the single-strand conductors is composed of a first conductor, any of the first conductors is wrapped with a single-strand conductor turn-to-turn insulation layer, the outer side of any of the multi-strand conductors is wrapped with a multi-strand conductor turn-to-turn insulation layer, any of the multi-strand conductors includes at least two parallel second conductors, the cross-sectional area of ​​any of the second conductors is smaller than the cross-sectional area of ​​any of the first conductors, and any of the second conductors is wrapped with a strand insulation layer.

[0006] Furthermore, the thickness of the strand insulation layer ranges from 5 μm to 150 μm.

[0007] Furthermore, the single-strand conductor and the multi-strand conductor are arranged along the radial direction of the iron core.

[0008] Furthermore, the multiple conductors in any stator slot are arranged on the inner side of the single conductor along the radial direction of the core.

[0009] Furthermore, the multi-strand conductor is a U-shaped transposed structure conductor, and the U-shaped transposed structure conductor includes two second conductors arranged along the radial direction of the iron core.

[0010] Compared with the prior art, the utility model has a positive and obvious effect. The utility model uses a multi-strand conductor to replace a single-strand conductor. The cross-sectional area of ​​each second conductor of the multi-strand conductor is smaller than the cross-sectional area of ​​the first conductor. The second conductor has a smaller cross-sectional area, which reduces the skin effect. Under the condition that the total volume remains unchanged, the cross-sectional area through which the current flows is increased, the current is dispersed, the current distribution is more uniform, the resistance is reduced, the AC loss is reduced, and the high-speed performance is improved. The second conductors of the multi-strand conductor are isolated from the turn-to-turn potential difference by the strand insulation layer, and the multi-strand conductor and the single-strand conductor are isolated from the potential difference between different conductors by the multi-strand conductor turn-to-turn insulation layer and the single-strand conductor turn-to-turn insulation layer. The slot insulation layer can protect the multi-strand conductor turn-to-turn insulation layer and the single-strand conductor turn-to-turn insulation layer to prevent scratches by the iron core, and isolate the potential difference between the first conductor, the second conductor and the stator iron core, reduce the contact between the conductors and between the conductors and the slot wall, reduce eddy currents, and enable each conductor to carry current more independently, thereby reducing the proximity effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of adjacent stator slots in a stator winding insulation structure of a drive motor according to the utility model.

[0012] Figure 2 The utility model is a schematic diagram of a winding structure in a stator winding insulation structure of a drive motor.

[0013] Figure 3 The utility model is a schematic diagram of a U-shaped transposed structure conductor in a stator winding insulation structure of a drive motor.

[0014] Figure 4 The utility model is a schematic diagram of the manufacturing process of a drive motor stator winding insulation structure. DETAILED DESCRIPTION

[0015] 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.

[0016] like Figure 1-Figure 4 As shown, a drive motor stator winding insulation structure of the utility model comprises an iron core 6, wherein a plurality of stator slots are arranged in a circumferential direction in the iron core 6, a slot insulation layer 5 is arranged on the wall of any of the stator slots, at least one single-strand conductor 7 and at least one multi-strand conductor 11 are respectively arranged in any of the stator slots, any of the single-strand conductors 7 is composed of a first conductor, any of the first conductors is wrapped with a single-strand conductor turn-to-turn insulation layer 4, the outer side of any of the multi-strand conductors 11 is wrapped with a multi-strand conductor turn-to-turn insulation layer 3, any of the multi-strand conductors 11 includes at least two parallel second conductors 1, the cross-sectional area of ​​any of the second conductors 1 is smaller than the cross-sectional area of ​​any of the first conductors, and any of the second conductors 1 is wrapped with a strand insulation layer 2.

[0017] Furthermore, the strand insulation layer 2 has a thickness ranging from 5 μm to 150 μm.

[0018] Furthermore, the single-strand conductor 7 and the multi-strand conductor 11 are arranged radially along the iron core 6 .

[0019] Furthermore, the multi-strand conductors 11 in any stator slot are arranged radially inside the single-strand conductor 7 in the core 6 .

[0020] Furthermore, the multi-strand conductor 11 is a U-shaped transposed structure conductor, and the U-shaped transposed structure conductor includes two second conductors 1 arranged along the radial direction of the iron core 6 .

[0021] Specifically, the iron core 6, the stator slots, the slot insulation layer 5, 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.

[0022] The working principle of this embodiment:

[0023] The utility model uses a multi-strand conductor 11 to replace a single-strand conductor 7. The cross-sectional area of ​​each second conductor 1 of the multi-strand conductor 11 is smaller than the cross-sectional area of ​​the first conductor. The second conductor 1 has a smaller cross-sectional area, which reduces the skin effect. When the total volume remains unchanged, the cross-sectional area through which the current flows is increased, the current is dispersed, the current distribution is more uniform, the resistance is reduced, the AC loss is reduced, and the high-speed performance is improved.

[0024] The inter-turn potential difference between the second conductors 1 of the multi-strand conductor 11 is isolated by the strand insulation layer 2, and the potential difference between different conductors is isolated by the multi-strand conductor inter-turn insulation layer 3 and the single-strand conductor inter-turn insulation layer 4 between the multi-strand conductor 11 and the single-strand conductor 7. The slot insulation layer 5 can protect the multi-strand conductor inter-turn insulation layer 3 and the single-strand conductor inter-turn insulation layer 4 to prevent scratches by the iron core 6, and isolate the potential difference between the first conductor, the second conductor 1 and the stator iron core 6, reduce the contact between the conductors and between the conductors and the slot wall, reduce eddy current, and enable each conductor to carry current more independently, thereby reducing the proximity effect.

[0025] Figure 1 The middle is a schematic diagram of the insulation structure of the winding, and the left and right are adjacent slots. The single-strand conductor 7 and the multi-strand conductor 11 are the carriers of the motor current. The strand insulation layer 2 can be made of insulating materials such as copper oxide, film, paint film, glass fiber, etc., with a thickness ranging from 5μm to 150μm.

[0026] The inter-turn insulation layer 3 of the multi-strand conductor can be made of film, glass fiber, thermoplastic plastic, with a thickness range of 0.05-0.3mm. The inter-turn insulation layer 4 of the single-strand conductor can be made of film, glass fiber, thermoplastic plastic, with a thickness range of 0.1-0.3mm. The slot insulation layer 5 can be made of film, polyaramid paper, non-woven fabric and soft composite material, with a thickness range of 0.1-0.3mm.

[0027] like Figure 3 The figure shows a schematic diagram of a U-shaped transposed structure conductor. The two conductors 12 and 13 are transposed between upper and lower layers after being bent 180 degrees, which reduces the cross-sectional area of ​​a single conductor, reduces the circulation between the strands at the notch, reduces copper loss, and improves the efficiency of the motor.

[0028] The core 6 is made of silicon steel sheets stacked axially to form the magnetic circuit of the motor. The winding 8 is composed of coils connected together and is the circuit part that establishes the magnetic field and transmits electrical energy. The winding lead wire 9 is used to connect the winding 8 to the outside. Different coils are connected together through the coil welding point 10 according to the winding method in the prior art to form the armature winding.

[0029] like Figure 4 As shown, the process implementation path is:

[0030] 1. Wire forming: Use stamping or CNC to form the notched magnet wire into Figure 3 The transposition structure shown in the figure shall not damage the insulation of the electromagnetic wire during the process.

[0031] 2. Slot insulation: The slot insulation layer 5 is bent and shaped and then inserted into the stator slot.

[0032] 3. Inserting wires: inserting the formed single-strand conductor 7 and multi-strand conductor 11 into the motor slot.

[0033] 4. Expanding and twisting: Use expanding and twisting equipment to expand and twist the wires to determine the connection method and spatial position of the windings.

[0034] 5. Welding: Weld the single-strand conductor 7 and the multi-strand conductor 11 and other wires to form the motor winding.

[0035] 6. Insulation treatment: Insulate the winding so that the motor core and the winding form a whole. The insulation treatment method can be drip dipping, vacuum pressure dipping, rolling dipping, immersion, etc.

Claims

1. A drive motor stator winding insulation structure, characterized in that: The invention comprises an iron core, wherein a plurality of stator slots are arranged in a circumferential direction in the iron core, a slot insulation layer is arranged on the wall of any of the stator slots, at least one single-strand conductor and at least one multi-strand conductor are arranged in each of the stator slots, any of the single-strand conductors is composed of a first conductor, any of the first conductors is wrapped with a single-strand conductor turn-to-turn insulation layer, the outer side of any of the multi-strand conductors is wrapped with a multi-strand conductor turn-to-turn insulation layer, any of the multi-strand conductors includes at least two parallel second conductors, the cross-sectional area of ​​any of the second conductors is smaller than the cross-sectional area of ​​any of the first conductors, and any of the second conductors is wrapped with a strand insulation layer.

2. The drive motor stator winding insulation structure according to claim 1, characterized in that: The thickness of the strand insulation layer ranges from 5 μm to 150 μm.

3. The drive motor stator winding insulation structure according to claim 1, characterized in that: The single-strand conductor and the multi-strand conductor are arranged along the radial direction of the iron core.

4. The drive motor stator winding insulation structure according to claim 1, characterized in that: The multiple conductors in any stator slot are arranged on the inner side of the single conductor along the radial direction of the core.

5. The drive motor stator winding insulation structure according to claim 1, characterized in that: The multi-strand conductor is a U-shaped transposed structure conductor, and the U-shaped transposed structure conductor includes two second conductors arranged along the radial direction of the iron core.

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