Novel magnetically controlled reactor

Abstract

The invention provides a novel magnetically controlled reactor, and relates to the technical field of reactors. The novel magnetically controlled reactor comprises a square iron core, a packaged alternating current coil and a packaged direct current coil, the six square-shaped iron cores are divided into two columns and three rows and are vertically arranged at intervals; the packaged alternating current coils are respectively arranged around the inner vertical part of the square-shaped iron core, the inner ends of the two packaged alternating current coils in each row are connected in series, and the outer ends of the two packaged alternating current coils in each row are respectively used as an input end and an output end; the packaged direct current coils are arranged in the hollow parts of the two columns of square iron cores in a penetrating mode and surround the two columns of packaged alternating current coils at intervals. According to the invention, the technical problem of how to significantly suppress the starting impact current and effectively improve the efficiency of adjusting the saturation and impedance of the iron core by the DC control current based on the high-voltage load is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, and particularly to a novel magnetically controlled reactor. Background Art

[0002] When a high-voltage load such as a high-voltage motor is directly started, the starting current can reach 5 to 8 times the rated current, causing a significant impact on the power grid, which may lead to a voltage sag or affect the operation of other devices. Therefore, a reactor is required for soft starting. By gradually increasing the voltage, the starting current can be made controllable, reducing the pressure on the power grid and the distribution system.

[0003] A magnetically controlled reactor is an iron-core reactor with AC and DC magnetization that can control its saturation. When working, a small DC can be used to change the saturation of the control iron core, or in other words, change the magnetic permeability of the iron core, thereby changing its inductive reactance value, so as to achieve the purpose of regulating the magnitude of the reactive current and smoothly adjusting the reactive power, and finally realizing the soft starting of the high-voltage motor.

[0004] In existing magnetically controlled reactors, the iron core can adopt various shapes (such as a Japanese character shape, a four-character shape, and a three-phase three-column shape). At the same time, the AC and DC coils are often arranged at different positions on the same iron core (for example, the DC coil is arranged on one side of the AC and DC coils). The above-mentioned existing iron core shapes and coil arrangements often cannot significantly suppress the transient impact current during motor starting and effectively improve the regulation efficiency of the DC control current on the iron core saturation and impedance. Therefore, it is not very suitable for the soft starting of high-voltage loads such as high-voltage motors. In addition, in existing three-phase magnetically controlled reactors, the two coils are often arranged at different parts of the same iron core, and the structural connection is relatively complex, which is not conducive to assembly and disassembly. Summary of the Invention

[0005] The purpose of the present invention is to provide a novel magnetically controlled reactor, which solves the technical problem of how to significantly suppress the starting impact current based on high-voltage loads and effectively improve the regulation efficiency of the DC control current on the iron core saturation and impedance.

[0006] Invention Solution:

[0007] The present invention provides a novel magnetically controlled reactor, including a square-shaped iron core, a packaged AC coil, and a packaged DC coil; the square-shaped iron core is arranged vertically in six parallel parts and divided into two columns and three rows with a vertical interval; the packaged AC coils are respectively arranged around the inner vertical parts of the square-shaped iron core, and the inner ends of the two packaged AC coils in each row are connected in series, and the outer ends are respectively used as the input end and the output end; the packaged DC coil passes through the hollow parts of the two columns of the square-shaped iron core and is arranged around the two columns of the packaged AC coils at intervals.

[0008] Furthermore, the two packaged AC coils in each row are connected in series in the same direction to form a single-phase AC coil group, and the input and output directions of the three-phase AC coil groups are kept consistent.

[0009] Further, the encapsulated AC coil is an epoxy resin coil.

[0010] Further, the vertical width of the encapsulated DC coil is adapted to the vertical width of the encapsulated AC coil.

[0011] Further, the U-shaped iron core is a non-gap iron core.

[0012] Further, it further includes a DC control unit, connected to the encapsulated DC coil, for providing an adjustable DC current.

[0013] Further, it further includes a mounting assembly, which includes an upper mounting frame, a lower mounting frame, and a middle connecting member connecting the two mounting frames; the U-shaped iron core, the encapsulated AC coil, and the encapsulated DC coil are arranged between the upper mounting frame and the lower mounting frame.

[0014] Further, accommodating and limiting parts are respectively provided on the opposite sides of the upper mounting frame and the lower mounting frame, and the two ends of the U-shaped iron core are respectively embedded and limited in the accommodating and limiting parts.

[0015] Further, mounting blocks are respectively provided at both ends of the encapsulated AC coil and the encapsulated DC coil, for spacing and mounting the coils between the two mounting frames.

[0016] Beneficial effects:

[0017] The present invention also provides a novel magnetic control reactor. Among them, in this application, two encapsulated AC coils are connected in series, which significantly increases the total impedance. The voltage division of the two coils is more suitable for high-voltage suppression scenarios, and can significantly suppress the transient impact current during motor startup; at the same time, a U-shaped iron core is adopted, and six encapsulated AC coils are respectively arranged around the inner vertical part of the U-shaped iron core, and the encapsulated DC coil is arranged entirely around the six encapsulated AC coils. In this way, the two coils can be closely coupled, which can enhance the magnetic field superposition effect, improve the adjustment efficiency of the DC control current on the iron core saturation, and thus adjust the impedance and current more accurately and efficiently. In addition, this layout structure adopts an independent layout design for the inner and outer coils, and the structural connection is relatively simple, which is conducive to assembly and disassembly. Description of the drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1Schematic diagram of the structure of the novel magnetically controlled reactor provided by this embodiment;

[0020] Figure 2 Partial schematic diagram of the structure of the novel magnetically controlled reactor provided by this embodiment;

[0021] Figure 3 Front view of the novel magnetically controlled reactor provided by this embodiment;

[0022] Figure 4 Bottom view of the novel magnetically controlled reactor provided by this embodiment;

[0023] Figure 5 Schematic diagram of the structure principle of the novel magnetically controlled reactor provided by this embodiment.

[0024] Icon:

[0025] 10 - Square - shaped iron core; 20 - Encapsulated AC coil; 30 - Encapsulated DC coil; 40 - DC control unit; 50 - Mounting assembly; 51 - Upper mounting frame; 52 - Lower mounting frame; 53 - Middle connecting piece; 60 - Mounting block. Specific implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] This embodiment provides a novel magnetically controlled reactor. Please refer to Figures 1-5As shown, it includes a square-shaped iron core 10, an encapsulated AC coil 20, and an encapsulated DC coil 30; the square-shaped iron core 10 is arranged vertically in two columns and three rows with six in parallel and spaced apart; the encapsulated AC coils 20 are respectively arranged around the inner vertical parts of the square-shaped iron core 10, and the inner ends of the two encapsulated AC coils 20 in each row are connected in series, and the outer ends are respectively used as the input end and the output end; the encapsulated DC coil 30 passes through the hollow parts of the two columns of the square-shaped iron core 10 and is arranged around the two columns of the encapsulated AC coils 20 at intervals.

[0030] Specifically, the inner ends of the two encapsulated AC coils 20 (i.e., the AC coils encapsulated with encapsulating materials) in each row are connected in series, and the outer ends are respectively used as the input end and the output end. As shown in the figure, A / B / C are often used as the input end to connect to a three-phase power supply, while X / Y / Z are often used as the output section to connect to a load such as a high-voltage motor; among them, the encapsulated DC coil 30 is arranged around all the encapsulated AC coils 20 at intervals. There is an encapsulation and physical interval between the two to avoid direct contact and improve safety.

[0031] In this embodiment, the two encapsulated AC coils 20 in each row are connected in series in the same direction to form a single-phase AC coil group, and the input and output directions of the three-phase AC coil group are kept consistent.

[0032] Specifically, the two encapsulated AC coils 20 in each row are connected in series in the same direction to form a single-phase AC coil group, that is, the head and tail of the two coils are connected, and the magnetic field directions of the two coils are the same. The total magnetic flux and equivalent inductance are enhanced, and the total impedance can be increased to significantly suppress the transient impact current during motor startup.

[0033] In this embodiment, the encapsulated AC coil 20 is an epoxy resin coil.

[0034] Specifically, the epoxy resin coil is usually composed of epoxy resin glue, wire, skeleton, etc.; in addition, the DC coil can also be encapsulated with epoxy resin, etc.

[0035] In this embodiment, the vertical width of the encapsulated DC coil 30 is adapted to the vertical width of the encapsulated AC coil 20.

[0036] Specifically, an encapsulation design of a vertical DC epoxy resin coil around a vertical AC epoxy resin coil (the vertical widths of the two coils are adapted) is adopted. Such a layout makes the DC magnetic field penetrate the iron core area where the AC coil is located uniformly, which can improve the magnetic coupling efficiency, reduce magnetic leakage, and improve the magnetic control sensitivity; at the same time, the adaptation of the vertical widths ensures that the coverage ranges of the AC and DC magnetic fields in the vertical direction are the same, avoiding local saturation or non-uniformity of the magnetic flux density, and improving the iron core utilization rate at the same time; in addition, the surrounding structure of the DC coil can form a local electromagnetic shield to weaken the influence of external interference on the AC main circuit; in addition, the separate encapsulation and vertical interval surrounding structure are also beneficial to natural convection heat dissipation.

[0037] In this embodiment, the U-shaped iron core 10 adopts a non-gapped iron core.

[0038] Specifically, by adopting a U-shaped non-gapped iron core (i.e., a closed magnetic circuit with no air gap design), the magnetic resistance can be significantly reduced (the proportion of air gap magnetic resistance usually reaches more than 70%), and the magnetic permeability can be increased by 3 to 5 times, thereby improving the inductance adjustment sensitivity; under the same DC control current, the inductance adjustment range is expanded to meet the wide-range impedance requirements of high-voltage motor soft start.

[0039] In this embodiment, it further includes a DC control unit 40, which is connected to the encapsulated DC coil 30 and is used to provide an adjustable DC current.

[0040] Specifically, the typical structure of the DC control unit 40 mainly includes: a power input and rectification filtering module (converting AC or DC input into stable DC), a power drive module (such as an H-bridge or PWM circuit to achieve dynamic current adjustment), a control core (a microcontroller / DSP running a closed-loop control algorithm, such as PID), a protection and communication module (overcurrent / overtemperature protection, isolated communication interface), and a heat dissipation system (heat sink and fan), etc.

[0041] In this embodiment, it further includes a mounting assembly 50. The mounting assembly 50 includes an upper mounting frame 51, a lower mounting frame 52, and a middle connecting member 53 connected between the two mounting frames; the U-shaped iron core 10, the encapsulated AC coil 20, and the encapsulated DC coil 30 are arranged between the upper mounting frame 51 and the lower mounting frame 52.

[0042] Specifically, the upper and lower mounting frames 52 and the middle connecting member 53 form a frame-type mounting structure, which significantly enhances the overall mechanical strength, resists external vibration or impact, prevents the coil from shifting or deforming due to force, and ensures long-term operation stability; in addition, the split design of the mounting frame is also beneficial for disassembly, assembly, combination.

[0043] In this embodiment, the opposite sides of the upper mounting frame 51 and the lower mounting frame 52 are respectively provided with accommodation limiting parts, and the two ends of the U-shaped iron core 10 are respectively embedded and limited in the accommodation limiting parts.

[0044] Specifically, the split mounting frame plus the embedded coil design allows the coil unit to be independently disassembled and assembled, simplifies the production and assembly process, and at the same time facilitates the disassembly, assembly, combination of the coil or the quick replacement of the coil in case of failure, reducing the cost and time of disassembly, assembly or maintenance.

[0045] In this embodiment, the two ends of the encapsulated AC coil 20 and the encapsulated DC coil 30 are respectively provided with mounting blocks 60, which are used to install the coils at intervals between the two mounting frames.

[0046] Specifically, the mounting blocks 60 at both ends of the coil are connected to the mounting frame through preset fixed positions, achieving precise alignment and uniform spaced arrangement of the coils, avoiding abnormal electromagnetic coupling caused by spacing deviation, and improving the performance consistency of the reactor. In addition, the mounting blocks 60 can adopt insulating materials (such as nylon or ceramic) and physical spacing design, which can weaken the stray capacitance and electromagnetic interference between the coils and improve the working stability of the reactor.

[0047] General working principle (taking the soft start of a high-voltage motor as an example):

[0048] Initial stage: When the current of the DC winding (encapsulating the DC coil 30) is 0, the reactance value of the AC winding (encapsulating the AC coil 20) is the largest, and the voltage at the load end (motor stator) is the lowest. The motor starts with the minimum current and torque.

[0049] Gradually boost the voltage: As the current of the DC winding increases, the magnetic saturation degree of the iron core deepens, the reactance value of the AC winding gradually decreases, and the motor terminal voltage rises, realizing smooth acceleration of the current and speed.

[0050] Complete startup: When the DC current reaches the set value, the AC reactance drops to the lowest, the motor terminal voltage approaches the rated value, and the motor enters the full-voltage operation state.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new type of magnetically controlled reactor, characterized in that: It comprises a square-shaped iron core (10), a packaged AC coil (20) and a packaged DC coil (30); The U-shaped iron cores (10) are six and are arranged in two columns and three rows vertically at intervals; The encapsulated AC coils (20) are respectively arranged around the inner vertical portion of the square-shaped iron core (10), and the inner ends of the two encapsulated AC coils (20) in each row are connected in series, and the outer ends serve as input ends and output ends respectively; The encapsulated DC coil (30) is inserted into the hollow parts of the two rows of the square-shaped iron cores (10), and is arranged around the two rows of the encapsulated AC coils (20) at intervals.

2. A novel magnetically controlled reactor according to claim 1, characterized in that: Two packaged AC coils (20) in each row are connected in series in a forward direction to form a single-phase AC coil group, and the input and output directions of the three-phase AC coil group remain consistent.

3. A novel magnetically controlled reactor according to claim 1, characterized in that: The packaged AC coil (20) is an epoxy resin coil.

4. A novel magnetically controlled reactor according to claim 1, characterized in that: The vertical width of the encapsulated DC coil (30) is adapted to the vertical width of the encapsulated AC coil (20).

5. A novel magnetically controlled reactor according to claim 1, characterized in that: The square-shaped iron core (10) adopts a gapless iron core.

6. A novel magnetically controlled reactor according to claim 1, characterized in that: It also includes a DC control unit (40) connected to the packaged DC coil (30) and used to provide an adjustable DC current.

7. A novel magnetically controlled reactor according to any one of claims 1 to 6, characterized in that: It also includes a mounting assembly (50), wherein the mounting assembly (50) includes an upper mounting frame (51), a lower mounting frame (52), and a middle connecting member (53) connected between the two mounting frames; The square-shaped iron core (10), the encapsulated AC coil (20) and the encapsulated DC coil (30) are arranged between the upper mounting frame (51) and the lower mounting frame (52).

8. A novel magnetically controlled reactor according to claim 7, characterized in that: The upper mounting frame (51) and the lower mounting frame (52) are provided with respective accommodating limit portions on opposite sides thereof, and the two ends of the square-shaped iron core (10) are respectively embedded and limited in the accommodating limit portions.

9. A novel magnetically controlled reactor according to claim 7, characterized in that: Mounting blocks (60) are respectively provided at both ends of the encapsulated AC coil (20) and the encapsulated DC coil (30) for mounting the coils between two mounting frames.

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