Double-layer multi-spiral coil wound by wires with unequal cross sections

Abstract

The invention discloses a double-layer multi-spiral coil wound by wires with unequal cross sections, and particularly relates to the field of transformers, the double-layer multi-spiral coil comprises an inner-layer coil supporting column, the outer side of the inner-layer coil supporting column is sleeved with an outer-layer coil supporting column, and the inner-layer coil supporting column and the outer-layer coil supporting column are concentrically arranged; a first wire, a second wire and a third wire are wound on the inner-layer coil supporting column, and the bottom ends of the first wire, the second wire and the third wire are wound on the outer-layer coil supporting column from bottom to top along the axis of the outer-layer coil supporting column. The double-layer multi-spiral coil is formed by winding a plurality of leads with unequal sectional areas, the coil is still formed by connecting the leads in parallel in the axial direction of the coil, the sizes of the leads in the radial direction of the coil are completely the same, and the sectional areas of the leads are changed by changing the axial sizes of the leads, so that when the lengths of the leads which are connected in parallel are the same, the lengths of the leads are uniform. And the plurality of wires connected in parallel have different direct-current resistances.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and more particularly to a double-layer multi-spiral coil wound with wires of unequal cross-sections. Background Art

[0002] The double-layer multi-spiral coil is a multi-spiral coil that uses several wires in parallel. The coil is divided into two layers, inner and outer, with opposite winding directions. The two layers of wires are connected and transitioned at the ends of the coil. The partial leakage flux generated by the current flowing through the coil between the two layers cancels each other out, thereby reducing the eddy current loss of the coil and surrounding structural parts. It has high technical and economic performance and is widely used in low-voltage windings of large-capacity transformers. This structural coil uses multiple wires of equal cross-section to be wound in parallel along the axial direction of the coil, and the coil is raised from the inner layer to the outer layer in the radial direction at one end of the coil. While raising the layers, the parallel wires are transposed in the axial direction.

[0003] However, since the coils are not transposed at the same position but are evenly distributed within 360° along the circumference, the actual number of turns of each parallel conductor in the inner and outer layers is not equal. In addition, since the spatial magnetic leakage of the inner and outer coils after the transformer is running is not the same, there is a circulating current between the parallel conductors. When the transformer capacity is large and the number of spirals is large, the circulating current will increase accordingly, which may cause excessive current on a parallel conductor and cause local overheating, endangering the safety and reliability of the transformer. Summary of the invention

[0004] The present invention provides a double-layer multi-spiral coil wound with unequal cross-section wires, and aims to solve the problem that: the existing double-layer multi-spiral coil has a circulating current between parallel wires because the spatial magnetic leakage of the inner and outer coils after the transformer is running is different. When the transformer capacity is large and the number of spirals is large, the circulating current will increase accordingly, which may cause excessive current on a parallel wire and cause local overheating, endangering the safety and reliability of the transformer.

[0005] To achieve the above object, the present invention provides the following technical solution: a double-layer multi-helical coil wound with wires of unequal cross-section, comprising an inner coil support column, an outer coil support column is sleeved on the outer side of the inner coil support column, and the inner coil support column and the outer coil support column are concentrically arranged;

[0006] The inner coil support column is wound with a first conductor, a second conductor and a third conductor, and the bottom ends of the first conductor, the second conductor and the third conductor are wound on the outer coil support column from bottom to top along the axis of the outer coil support column;

[0007] The first, second and third conductors wound on the inner coil support column are the inner coil, and the first, second and third conductors wound on the outer coil support column are the outer coil.

[0008] In a preferred embodiment, the radial dimensions of the first conductor, the second conductor and the third conductor are the same, and the first conductor, the second conductor and the third conductor have the same cross-sectional area.

[0009] In a preferred embodiment, the winding method of the wire 1, wire 2 and wire 3 in the inner coil and the outer coil is parallel winding, and the wire 1, wire 2 and wire 3 in the inner coil and the outer coil are arranged in parallel.

[0010] In a preferred embodiment, the wire 1, the wire 2 and the wire 3 in the inner coil and the outer coil are wound in association, and the wire 1, the wire 2 and the wire 3 in the inner coil and the outer coil are connected to each other.

[0011] In a preferred embodiment, the arrangement order of wire one, wire two and wire three in the axial direction from top to bottom of the inner coil support column is wire three, wire two and wire one, respectively, and the arrangement order of wire one, wire two and wire three in the axial direction from top to bottom of the outer coil support column is wire one, wire two and wire three, respectively.

[0012] In a preferred embodiment, the inner coil support column and the outer coil support column are both configured as circular columnar structures, and the diameter of the inner coil support column is smaller than the diameter of the outer coil support column.

[0013] The beneficial effects of the present invention are:

[0014] 1. The double-layer multi-spiral coil wound with wires of unequal cross-sections proposed in the present invention is wound with multiple wires of unequal cross-sectional areas. The coil still uses multiple wires connected in parallel along the axial direction of the coil. The size of each wire in the radial direction of the coil is exactly the same. The cross-sectional area of ​​each wire is changed by changing its axial size, so that when the lengths of the parallel wires are the same, the multiple parallel wires have different DC resistances.

[0015] 2. The double-layer multi-spiral coil wound with wires of unequal cross-section proposed in the present invention has different DC resistances of the multiple wires connected in parallel. When the multiple wires are connected in parallel, the circulating current generated by the induced electric potential due to the geometric structure of the coil and the different leakage magnetic fields in the space in which they are located and the circulating current generated by the different resistances between the parallel wires cancel each other out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the coil structure schematic diagram of the present invention.

[0017] The figures are marked as follows: 1. conductor one; 2. conductor two; 3. conductor three; 4. inner coil support column; 5. outer coil support column. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Refer to the instruction manual Figure 1 A double-layer multi-spiral coil wound with wires of unequal cross-sections, comprising an inner coil support column 4, an outer coil support column 5 is sleeved on the outer side of the inner coil support column 4, and the inner coil support column 4 and the outer coil support column 5 are concentrically arranged; a wire 1, a wire 2, and a wire 3 are wound on the inner coil support column 4, and the bottom ends of the wire 1, the wire 2, and the wire 3 are wound on the outer coil support column 5 from bottom to top along the axis of the outer coil support column 5; the wire 1, the wire 2, and the wire 3 wound on the inner coil support column 4 are the inner coil, and the wire 1, the wire 2, and the wire 3 wound on the outer coil support column 5 are the outer coil.

[0020] The implementation scenario is specifically as follows: the inner coil and the outer coil are formed by winding the wire 1, the wire 2 and the wire 3 on the inner coil support column 4 and the outer coil support column 5. The bottom ends of the wire 1, the wire 2 and the wire 3 are wound on the outer coil support column 5 from bottom to top along the axis of the outer coil support column 5. The working principle of this double-layer multi-spiral coil is based on the electromagnetic induction phenomenon. When current is passed through the wires of the inner coil and the outer coil, a magnetic field is generated around the coil. This magnetic field can be transmitted through the mutual inductance between the wires in the coil, thereby realizing the transfer and transmission of electromagnetic energy. The arrangement of wires of unequal cross-sections of the inner coil and the outer coil can realize the control of the resistance and inductance of the coil. Wires of different cross-sections have different resistance and inductance characteristics, so the total resistance and inductance values ​​of the coil can be adjusted by reasonable design and selection of the wire cross-section.

[0021] The double-layer multi-spiral coil structure can increase the total number of turns and effective area of ​​the coil, thereby improving the electromagnetic induction effect. At the same time, the concentric arrangement between the inner coil and the outer coil and the winding method of the wire can achieve a higher electromagnetic coupling efficiency.

[0022] This design can be applied to a variety of electromagnetic devices and systems, such as transformers, sensors, inductive components, etc., to achieve specific electromagnetic performance and functional requirements.

[0023] Refer to the instruction manual Figure 1 , the radial dimensions of the conductor 1 1 , the conductor 2 2 and the conductor 3 3 are the same, the conductor 1 1 , the conductor 2 2 and the conductor 3 3 have the same cross-sectional area, and the axial dimensions are different.

[0024] It should be noted that by adjusting the axial size of the wire, a more uniform distribution of current within the coil can be achieved. A wire with a larger axial size can accommodate more current, while a wire with a smaller axial size can restrict the flow of current. This optimized current distribution helps reduce current concentration and hot spots, and improves the efficiency and stability of the coil. The axial size of the wire has an impact on the inductance and resistance characteristics of the coil. A wire with a larger axial size can increase the inductance of the coil, while a wire with a smaller axial size can reduce the inductance of the coil.

[0025] Refer to the instruction manual Figure 1 The winding method of the wire 1, wire 2 and wire 3 in the inner coil and the outer coil is parallel winding, and the wire 1, wire 2 and wire 3 in the inner coil and the outer coil are arranged in parallel.

[0026] It should be noted that when wire 1, wire 2, and wire 3 are wound in parallel, the total resistance of the wire will decrease, and parallel winding can increase the cross-sectional area of ​​the wire, thereby reducing resistance. Lower resistance means higher current transmission efficiency and less energy loss. Parallel winding can increase the capacity of wires 1, wire 2, and wire 3, that is, the current load that the wire can withstand. By connecting multiple wires in parallel, the total cross-sectional area can be increased, thereby increasing the current capacity of the wire. This is very important for high-power applications and circuits with large currents. By winding multiple wires in parallel, the reliability of the system can be improved. If one of the wires fails or is damaged, the other parallel wires can still work normally to maintain the connectivity of the circuit. This redundant design can reduce the risk of system failure and improve the reliability and stability of the overall system. Parallel winding can also reduce electromagnetic interference between wires.

[0027] Refer to the instruction manual Figure 1 , which is different from the above parallel winding, the wire 1, wire 2 and wire 3 in the inner coil and the outer coil are associated winding, which means that there is a certain electromagnetic coupling between them. In the associated winding, the wires of the inner coil and the outer coil are interconnected, and through electromagnetic induction, the current transfers energy between the two coils, and the wire 1, wire 2 and wire 3 in the inner coil and the outer coil are connected to each other. The number of wires is not limited to wire 1, wire 2 and wire 3, and can also be other numbers of wires.

[0028] It should be noted that series winding is a technique that connects multiple wires together in sequence. When multiple wires are wound in series, the total voltage will increase. This is because the series winding can superimpose the voltages of each wire in sequence, resulting in a higher total voltage. This is very useful in certain specific applications, such as circuits or devices that need to provide a larger voltage. By winding multiple wires in series, the flexibility of the system can be increased. Series winding allows connection points or branches to be inserted between wires, so that the circuit can be adjusted or expanded as needed. This is very useful for applications that require variable or adjustable circuit topology. In series winding, the current will pass through each wire in turn. This can evenly distribute the current between the wires, thereby preventing a wire from being subjected to too high a current and causing overheating or other problems. Therefore, series winding helps to achieve a balanced distribution of current.

[0029] Refer to the instruction manual Figure 1 The arrangement order of wire one 1, wire two 2 and wire three 3 in the axial direction from top to bottom of the inner coil support column 4 is wire three 3, wire two 2, wire one 1, and the arrangement order of wire one 1, wire two 2 and wire three 3 in the axial direction from top to bottom of the outer coil support column 5 is wire one 1, wire two 2, wire three 3.

[0030] It should be noted that due to the different arrangement order of the wires on the inner and outer coils, the electromagnetic fields between them cancel each other out better. This helps reduce electromagnetic interference between coils and improves the anti-interference ability of the entire system. By changing the arrangement order of the wires, the current distribution on the inner and outer coils can be more uniform. This can avoid the situation where some wires are subjected to excessive current and cause imbalance, and improve the stability and life of the coils. By adjusting the arrangement order of the wires, the inductance and resistance characteristics of the coil can be optimized.

[0031] Refer to the instruction manual Figure 1 The inner coil support column 4 and the outer coil support column 5 are both set as circular columnar structures. The diameter of the inner coil support column 4 is smaller than the diameter of the outer coil support column 5. The cross-sectional shapes of the inner coil support column 4 and the outer coil support column 5 when viewed from above are both circular.

[0032] It should be noted that the circular structure has advantages in the distribution of bearing force. Compared with other shapes, such as square or rectangular, the circular structure can disperse stress more evenly. This helps to reduce stress concentration on the structure and improve the structural strength and stability of the inner coil support column 4 and the outer coil support column 5. The circular structure is also effective in providing support. Due to the uniform distribution characteristics of the circle, the circular cross-section of the inner coil support column 4 and the outer coil support column 5 can provide uniform support force. This helps to maintain the geometric shape and stability of the coil.

[0033] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A double-layer multi-helical coil wound with wires of unequal cross-section, characterized in that: include: An inner coil support column (4), wherein an outer coil support column (5) is sleeved on the outer side of the inner coil support column (4), and the inner coil support column (4) and the outer coil support column (5) are concentrically arranged; The inner coil support column (4) is provided with a first conductor (1), a second conductor (2) and a third conductor (3) wound thereon, and the bottom ends of the first conductor (1), the second conductor (2) and the third conductor (3) are wound on the outer coil support column (5) from bottom to top along the axis of the outer coil support column (5); The conductor one (1), the conductor two (2) and the conductor three (3) wound on the inner coil support column (4) form an inner coil, and the conductor one (1), the conductor two (2) and the conductor three (3) wound on the outer coil support column (5) form an outer coil; The radial dimensions of the conductor one (1), the conductor two (2) and the conductor three (3) are the same, and the conductor one (1), the conductor two (2) and the conductor three (3) have the same cross-sectional area.

2. The double-layer multi-spiral coil wound with wires of unequal cross-section according to claim 1, characterized in that: The winding method of the conductor 1 (1), the conductor 2 (2) and the conductor 3 (3) in the inner coil and the outer coil is parallel winding, and the conductor 1 (1), the conductor 2 (2) and the conductor 3 (3) in the inner coil and the outer coil are arranged in parallel.

3. The double-layer multi-spiral coil wound with wires of unequal cross-section according to claim 2, characterized in that: The conductors 1 (1), 2 (2) and 3 (3) in the inner coil and the outer coil are wound in association, and the conductors 1 (1), 2 (2) and 3 (3) in the inner coil and the outer coil are connected to each other.

4. The double-layer multi-spiral coil wound with wires of unequal cross-section according to claim 3, characterized in that: The arrangement order of the conductor one (1), the conductor two (2) and the conductor three (3) in the axial direction from top to bottom of the inner coil support column (4) is conductor three (3), conductor two (2), conductor one (1), and the arrangement order of the conductor one (1), the conductor two (2) and the conductor three (3) in the axial direction from top to bottom of the outer coil support column (5) is conductor one (1), conductor two (2), conductor three (3).

5. The double-layer multi-spiral coil wound with wires of unequal cross-section according to claim 4, characterized in that: The inner coil support column (4) and the outer coil support column (5) are both configured as circular columnar structures, and the diameter of the inner coil support column (4) is smaller than the diameter of the outer coil support column (5).

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