Magnetic bar coil and laminated ultralow-frequency high-voltage generator

Abstract

The utility model provides a magnetic bar coil and a laminated ultra-low-frequency high-voltage generator, and relates to the technical field of electron and high-voltage measurement. The winding structure of the coil on the periphery of the magnetic bar is that the two ends are densely wound and the middle is sparsely wound; the periphery of the magnetic bar wound with the coil is sleeved with an insulating tube; the magnetic bar is connected with a plurality of high-voltage lamination units of the lamination type booster in a magnetic field coupling mode. The coil is wound on the periphery of the magnetic bar according to the structure that the two ends are densely wound and the middle is sparsely wound, so that the magnetic flux of the whole body of the magnetic bar is equal, the voltage uniformity of each high-voltage laminated unit is improved, the ultralow-frequency high-voltage generator magnetic bar coil can stably and reliably work, and the high-voltage laminated units are prevented from being damaged due to overvoltage.

Description

Technical Field

[0001] The utility model relates to the field of electronics and high-voltage measurement technology, specifically to a magnetic rod coil and a laminated ultra-low frequency high-voltage generator. Background Art

[0002] This section only provides background technical information related to the present invention and does not necessarily constitute prior art.

[0003] Ultra-low-frequency (ULF) high-voltage generators can be used for withstand voltage testing of power cables, replacing power frequency generators and significantly reducing the weight and size of test equipment. Even so, existing ULF high-voltage generators of the same capacity are still bulky. Typically, an 80kV / 50m ULF tester can weigh up to 100kg and be bulky.

[0004] To reduce size and weight, a new laminated ultra-low frequency high-voltage generator has emerged. This new structure can reduce the weight of the device to around 30kg and significantly reduce the size. This high-voltage generator requires the principle of a high-frequency transformer to achieve low-voltage to high-voltage energy transmission.

[0005] The current problem is that when the magnetic bar coils are wound evenly, the output voltage distribution of each high-voltage laminated unit is not uniform, especially the output voltage at the two ends is low, and the output voltage in the middle is high. The voltage values ​​can differ by more than twice, which leads to inconsistent loads on each high-voltage laminated unit and even causes the middle high-voltage laminated unit to burn out due to overvoltage. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a magnetic bar coil and a laminated ultra-low frequency high-voltage generator. The coil of the high-voltage generator adopts a non-uniform winding structure. Specifically, the coil in the middle of the magnetic bar is sparsely wound, and the coils at both ends of the magnetic bar are densely wound. This overcomes the problem that the magnetic flux in the middle of the magnetic bar is large and the magnetic flux at both ends is small, so that the voltage of each high-voltage laminated unit on the outside of the magnetic bar is evenly distributed.

[0007] In order to achieve the above object, the utility model provides a magnetic bar coil and a laminated ultra-low frequency high voltage generator, which adopt the following technical solution: comprising a magnetic bar and a coil, wherein the winding structure of the coil on the periphery of the magnetic bar is densely wound at both ends and sparsely wound in the middle;

[0008] An insulating tube is provided around the outer periphery of the magnetic rod provided with the coil;

[0009] The magnetic rod is connected to a plurality of high-voltage laminated units of the laminated booster through magnetic field coupling.

[0010] According to a further technical solution, the magnetic rod is made of manganese-zinc ferrite.

[0011] According to a further technical solution, the magnetic rod has a magnetic permeability greater than that of manganese-zinc ferrite.

[0012] According to a further technical solution, the magnetic rod retains a set length at both ends after passing through the laminated booster.

[0013] According to a further technical solution, the coil is wound with multiple strands of enameled wire.

[0014] According to a further technical solution, the coil is wound with multiple strands of flat copper strips.

[0015] According to a further technical solution, the coil is tightly attached to the magnetic rod when being wound.

[0016] According to a further technical solution, grooves are provided on the sides of the magnetic bar for looping.

[0017] A further technical solution is that when a single magnetic rod does not reach the set length, two or more magnetic rods can be bonded together to form a magnetic rod of the set length.

[0018] The beneficial effects of the utility model are:

[0019] The utility model winds the coil around the periphery of the magnetic rod in a structure with dense winding at both ends and sparse winding in the middle, so that the magnetic flux in the magnetic rod is equal, the voltage uniformity of each high-voltage laminated unit is improved, and the ultra-low frequency high-voltage generator can work stably and reliably.

[0020] The utility model adopts magnetic rods to be bonded to achieve the required length, and the coils are wound around the periphery of the magnetic rods according to a structure in which the ends are densely wound and the middle is sparsely wound, thereby improving the voltage uniformity of each high-voltage laminated unit, enabling the laminated ultra-low frequency high-voltage generator to work stably and reliably, and preventing the high-voltage laminated unit from being damaged due to overvoltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 The utility model is a schematic diagram of the application structure of a magnetic rod coil and a laminated ultra-low frequency high-voltage generator.

[0023] Figure 2 This is a cross-sectional view of a magnetic bar coil and a laminated ultra-low frequency high-voltage generator of the utility model, including a magnetic bar, a coil, a return line and an insulating tube.

[0024] Figure 3 The utility model discloses a magnetic bar coil and a coil winding method for a laminated ultra-low frequency high voltage generator.

[0025] Figure 4 This is a schematic diagram showing that the uniform winding of the magnetic bar coil in the prior art leads to uneven output voltage.

[0026] Figure 5 This is a schematic diagram of a magnetic bar coil and a laminated ultra-low frequency high-voltage generator of the present invention, which is characterized by uneven winding resulting in uniform output voltage.

[0027] Among them, 1. Insulation tube; 2. Magnetic rod; 3. Coil; 4. Return line; 5. Laminated booster; 6. Magnetic lines; 7. High-voltage laminated unit coil; 8. Groove. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0030] In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] The utility model discloses a magnetic rod coil and a laminated ultra-low frequency high voltage generator.

[0032] like Figure 3 As shown, a magnetic bar coil and a laminated ultra-low frequency high-voltage generator include: a magnetic bar 2 and a coil 3. The coil 3 is wound around the outer periphery of the magnetic bar 2 with dense winding at both ends and sparse winding in the middle; an insulating tube 1 is sheathed around the outer periphery of the magnetic bar 2 with the coil 3 wound around it; the magnetic bar 2 is connected to several high-voltage laminated units of the laminated booster through magnetic field coupling.

[0033] like Figure 1 As shown, a magnetic bar coil and a laminated ultra-low frequency high-voltage generator include two magnetic bars 2, the first and second magnetic bars, and a laminated booster. The laminated booster includes several high-voltage laminated units. Each high-voltage laminated unit comprises two parts, a and b, connected in reverse series. Each part includes a coil, a rectifier, a filter, and other circuits, ensuring that its output voltage is proportional to the coil induced voltage. The unit can output a positive voltage when driven by the first magnetic bar and a negative voltage when driven by the second magnetic bar. When n high-voltage laminated units, a1 / b1 to an / bn, are connected in series, a positive or negative high-voltage output Uo is ultimately obtained. Therefore, the purpose of the present invention is to ensure that the coils of each laminated unit can induce a uniform voltage when driven by the magnetic bars.

[0034] In some embodiments, when selecting a magnetic rod 2, the magnetic permeability of the magnetic rod 2 should be as high as possible. Manganese-zinc ferrite should be used, or other magnetic rods 2 with a higher magnetic permeability than manganese-zinc ferrite should be used. The cross-sectional area of ​​the magnetic rod 2 should be as large as possible. A larger cross-section helps increase coupling power and reduce temperature rise. The length of the magnetic rod 2 should be as long as possible. For example, after passing through the laminated booster, at least 20 mm should remain at both ends. If the finished magnetic rod 2 is not long enough, several magnetic rods 2 can be bonded together to form a magnetic rod 2 of the required length.

[0035] In some embodiments, as Figure 2 As shown, coil 3 is wound with multiple strands of enameled wire or flat copper tape. During winding, coil 3 should be tightly attached to the surface of magnetic bar 2, minimizing its thickness to fully utilize the space inside insulating tube 1. A groove 8 is provided on the side of magnetic bar 2 for looping the coil 3 after winding, thus avoiding increasing its thickness and reducing space requirements.

[0036] like Figure 4 As described above, if the coil 3 on the magnetic bar 2 is wound in a uniform manner, the magnetic lines of force 6 at both ends of the magnetic bar 2 diverge, the magnetic flux entering the high-voltage laminated unit coils at both ends of the magnetic bar 2 is small, and the output voltage is low. The magnetic lines of force 6 in the middle of the magnetic bar 2 are concentrated, the magnetic flux entering the high-voltage laminated unit coils in the middle part of the magnetic bar 2 is large, and the output voltage is high. Due to the difference in magnetic flux, the voltage distribution of each high-voltage laminated unit is uneven.

[0037] like Figure 3 As shown, the coil 3 on the magnetic bar 2 is wound in a dense manner at both ends and sparsely in the middle, as shown in FIG. Figure 5 As shown, a specific uneven winding method is used to concentrate the magnetic lines of force 6 in the magnetic bar 2 and to make the magnetic flux entering the coils of each high-voltage laminate unit equal. The specific winding method can be determined through experiments so that the unevenness of the voltage distribution of each high-voltage laminate unit actually measured at full power is less than 10%.

[0038] It should be noted that those skilled in the art can adjust the density of the winding of the coil 3 according to the material and length of the magnetic rod 2 to achieve the technical effect of uniform voltage distribution of each high-voltage laminated unit.

[0039] In this embodiment, a 40kV / 40mA laminated ultra-low frequency high voltage generator and an 80kV / 50mA laminated ultra-low frequency high voltage generator are taken as examples to explain the present invention in detail.

[0040] When the utility model is applied to a 40kV / 40mA laminated ultra-low frequency high voltage generator:

[0041] In some embodiments, the laminated booster of the laminated ultra-low frequency high-voltage generator includes 20 high-voltage laminated units with a total height of 146 mm. It uses a single manganese-zinc ferrite magnetic rod 2 with a diameter of 34 mm and a length of 200 mm. The magnetic rod 2 has grooves 8 on both sides for return lines. The coil 3 uses three three-layer insulating enameled wires with an outer diameter of 0.8 mm in parallel. 13T is wound at each end of the magnetic rod 2, totaling 26T, where T is the number of turns. The approximately 120mm portion in the middle of the magnetic rod 2 is left empty and not wound. The outer diameter of the wound magnetic rod 2 coil 3 is about 36 mm and can be inserted into an insulating sleeve with an inner diameter of 38 mm. The measured voltage unevenness of each high-voltage laminated unit is less than 10% when the full power output is achieved. The temperature of the magnetic rod 2 rises by 50° after one hour of full load operation, which meets the requirements.

[0042] When the utility model is applied to 80kV / 50mA laminated ultra-low frequency high voltage generator:

[0043] The stacked booster consists of 40 high-voltage laminated units, with a total height of 298 mm. Two manganese-zinc ferrite magnetic rods (2) with a diameter of 34 mm and lengths of 200 mm and 140 mm are bonded together to form a total length of 340 mm. The rods have grooves (8) on both sides for the return line. The coils (3) are wound with 0.5 mm x 4 mm flat copper tape, with 9 tonnes of coiled wire densely wound at each end, 1.5 mm apart, and 10 tonnes of coiled wire sparsely wound in the middle, for a total of 28 tonnes. The finished coils (3) have an outer diameter of approximately 35 mm and can be inserted into an insulating sleeve with an inner diameter of 38 mm. At full power output, the voltage nonuniformity of each high-voltage laminated unit was measured to be less than 10%. The temperature rise of the rods (2) after one hour of full load operation met the requirements by 90°C.

[0044] The working principle of this utility model is:

[0045] The coil 3 on the magnetic rod 2 is wound densely at both ends and sparsely in the middle. The two magnetic rods 2 are wound using the above coil winding structure. The above two magnetic rods 2 are passed through the laminated booster, so that the high-voltage laminated unit coil 7 of the laminated booster is connected to the corresponding coil 3 through magnetic field coupling. The uneven winding method makes the magnetic flux in the two magnetic rods 2 equal, so as to achieve uniform voltage distribution of each high-voltage laminated unit.

[0046] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A laminated ultra-low frequency high voltage generator magnetic bar coil, characterized in that: It comprises a magnetic bar and a coil, wherein the coil is wound around the outer periphery of the magnetic bar in a structure of dense winding at both ends and sparse winding in the middle; An insulating tube is provided around the outer periphery of the magnetic rod provided with the coil; The magnetic rod is connected to a plurality of high-voltage laminated units of the laminated booster through magnetic field coupling.

2. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The magnetic rod is made of manganese-zinc ferrite.

3. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The magnetic rod has a magnetic permeability greater than that of manganese-zinc ferrite.

4. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: After the magnetic bar passes through the laminated booster, a set distance is retained between the two ends.

5. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The coil is wound with multiple strands of enameled wire.

6. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The coil is wound with multiple strands of flat copper strips.

7. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The coil is tightly attached to the magnetic bar when it is wound.

8. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: The side of the magnetic bar is provided with a groove for looping.

9. The laminated ultra-low frequency high voltage generator magnetic bar coil according to claim 1, characterized in that: When a single magnetic rod does not reach the set length, two or more magnetic rods can be bonded together to form a magnetic rod of the set length.

10. A laminated ultra-low frequency high voltage generator, characterized in that: Application: The magnetic bar coil according to any one of claims 1 to 9.

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