Inductor for high-efficiency inverter

Abstract

The invention relates to the technical field of inductors, and discloses an inductor for a high-efficiency inverter, which comprises an upper magnet yoke and a lower magnet yoke which are symmetrically arranged, a plurality of stacked first magnetic columns, second magnetic columns and third magnetic columns are connected side by side between the upper magnet yoke and the lower magnet yoke, and the first magnetic columns and the third magnetic columns are mutually symmetrical. The second magnetic column is located between the first magnetic column and the third magnetic column, air gap pieces are arranged on the stacking faces of the first magnetic column, the second magnetic column and the third magnetic column which are stacked, the number of the air gap pieces in the first magnetic column and the number of the air gap pieces in the third magnetic column are the same and smaller than the number of the air gap pieces in the second magnetic column, a first winding is wound around the first magnetic column, and a second winding is wound around the second magnetic column. A second winding is wound on the third magnetic column, and no winding is wound on the second magnetic column. The number of the air gap pieces in the first magnetic column and the third magnetic column is the same and smaller than that of the air gap pieces in the second magnetic column, the inductor with the large differential mode inductance value and the small common mode inductance value is formed, iron loss can be reduced, high-frequency current can be restrained, the skin effect can be reduced, and copper loss can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of inductors, and in particular to an inductor for a high-efficiency inverter. Background Art

[0002] The operating principle of high-frequency inductors is based on electromagnetic theory research conducted in the late 19th and early 20th centuries. When alternating current flows through a conductor, it generates an alternating magnetic field in and around it. Inductors utilize this property to convert electrical energy into magnetic energy and store it. They also use the principle of electromagnetic induction to convert AC to DC, or to limit and stabilize current in circuits. Currently, high-frequency inductor designs often use amorphous cores, nanocrystalline cores, soft magnetic powder cores, ferrite cores, and other materials as the magnetic circuit component. Each inductor requires a complete closed magnetic circuit to function as the inductor's magnetic flux path. Due to their structural characteristics, high-frequency inductors are often used with one or more inductors connected in series or parallel per phase. This presents significant design challenges for high-power or three-phase circuit products. Summary of the Invention

[0003] In view of the above problems in the prior art, a high-efficiency inductor for an inverter is proposed.

[0004] The present application provides an inductor for a high-efficiency inverter, the purpose of which is to enable the filter inductor of the inverter power supply to selectively filter out more differential mode components and less common mode components, thereby alleviating the filtering requirements of the inductor and improving the output waveform quality of the inverter power supply.

[0005] The technical solution of the present invention is: an inductor for a high-efficiency inverter, comprising a symmetrically arranged upper magnetic yoke and a lower magnetic yoke, wherein a plurality of stacked first magnetic pillars, second magnetic pillars, and third magnetic pillars are connected side by side between the upper magnetic yoke and the lower magnetic yoke, wherein the first magnetic pillar and the third magnetic pillar are symmetrical to each other, the second magnetic pillar is located between the first magnetic pillar and the third magnetic pillar, and the second magnetic pillar is spaced equal to the first magnetic pillar and the third magnetic pillar; the plurality of stacked first magnetic pillars, second magnetic pillars, and third magnetic pillars are respectively provided with air gaps on the stacking surface, the number of air gaps in the first magnetic pillar and the third magnetic pillar is the same and less than the number of air gaps in the second magnetic pillar; a first winding is wound on the first magnetic pillar, a second winding is wound on the third magnetic pillar, and no winding is wound on the second magnetic pillar; the first winding and the second winding are made of the same material and have the same number of turns.

[0006] By adopting the above solution, the number of air gaps in the first and third magnetic columns is the same and smaller than the number of air gaps in the second magnetic column, thereby forming an inductor with a large differential-mode inductance and a small common-mode inductance. The large differential-mode inductance greatly compresses the high-frequency ripple current, thereby limiting the working magnetic flux density of the high-frequency component, which is beneficial to reducing iron loss. The high-frequency current is suppressed, which is beneficial to reducing the skin effect and lowering copper loss.

[0007] Furthermore, the first magnetic column, the second magnetic column and the third magnetic column are made of high magnetic permeability soft magnetic material.

[0008] By adopting the above solution, the magnetic resistance is reduced and the magnetic field distribution is made more uniform.

[0009] Furthermore, symmetrical clamping plates are provided on the upper side of the upper magnetic yoke and the lower side of the lower magnetic yoke, and the pair of clamping plates are fixed by tightening bolts.

[0010] With the above solution, symmetrical clamping plates are provided to enable the upper magnetic yoke and the lower magnetic yoke to press the first magnetic column, the second magnetic column and the third magnetic column.

[0011] Furthermore, an air gap adjustment component is provided in the upper clamping plate;

[0012] The air gap adjustment assembly includes three sliding cavities arranged in the upper magnetic yoke, the positions and sizes of the three sliding cavities correspond to the first magnetic column, the second magnetic column and the third magnetic column respectively, and the first sliding column, the second sliding column and the third sliding column are respectively arranged in the sliding cavity, and are respectively located above the first magnetic column, the second magnetic column and the third magnetic column. The first magnetic column, the second magnetic column and the third magnetic column are all provided with threaded columns, the upper ends of the threaded columns are rotatably arranged in the upper side clamping plate, and each threaded column is connected to a gear, and the gears on the threaded columns on both sides are engaged with the gear on the middle threaded column.

[0013] The above solution, by providing an air gap adjustment component, can dynamically adjust the common-mode and differential-mode inductances based on the actual operating state of the inverter. Under different operating conditions, the requirements for suppressing common-mode and differential-mode components may vary. Adjusting the air gap can specifically enhance or weaken the filtering effect on these components, thereby optimizing the inverter's output waveform quality.

[0014] Furthermore, the air gap sheet is provided with a plurality of elastic sheets protruding in the upward and downward directions, and the elastic sheets protruding in the upward and downward directions are staggeredly distributed on the air gap sheet.

[0015] By adopting the above solution and arranging the elastic sheet, when the gap between the magnetic columns increases, the air gap sheet can fill the gap.

[0016] Furthermore, an upper clamping plate is provided on the upper end of the threaded column located in the middle and is connected to a rotating wheel.

[0017] With the above solution, a rotating wheel is provided to manually rotate the threaded column in the middle.

[0018] Furthermore, elastic particles are provided on the lower end surface of the rotating wheel near the edge, a boss is provided on the clamping plate below the rotating wheel, and pits are provided on the boss at equal intervals in a ring shape, and the elastic particles are engaged in the pits when rotating.

[0019] The above solution is adopted to increase the rotation damping of the rotating wheel by arranging elastic particles and pits, and at the same time, the rotating wheel can be adjusted at equal angles.

[0020] Furthermore, insulating pressure plates are provided on the upper and lower sides of the first winding and the second winding.

[0021] By adopting the above solution, the dielectric strength between windings can be enhanced by setting an insulating pressure plate to prevent high-voltage breakdown or short circuit between turns; the coil is fixed by mechanical compression to reduce displacement wear caused by electromagnetic vibration, while optimizing the heat dissipation path.

[0022] Furthermore, insulating paper is provided between the first magnetic column and the first winding, and between the third magnetic column and the second winding.

[0023] By adopting the above solution, by providing insulating paper, electrical insulation, electromagnetic interference prevention, mechanical protection, potential isolation, and the support winding can be fixed.

[0024] Furthermore, the cross-sections of the first magnetic column and the third magnetic column are equal, and the sum of their cross-sectional areas is equal to the cross-sectional area of the second magnetic column.

[0025] The above scheme and the above setting are beneficial to the balance of the magnetic circuit, making the common-mode and differential-mode magnetic flux distribution more reasonable, optimizing the inductance performance, enhancing the suppression effect of common-mode and differential-mode components, reducing magnetic loss, and improving the working efficiency and stability of the inductor.

[0026] Beneficial effects of the present invention:

[0027] 1. By making the number of air gaps in the first and third magnetic columns the same and smaller than the number of air gaps in the second magnetic column, an inductor is formed with a large differential-mode inductance and a small common-mode inductance. The large differential-mode inductance greatly compresses the high-frequency ripple current, thereby limiting the working magnetic flux density of the high-frequency component, which is beneficial to reducing iron loss. The high-frequency current is suppressed, which is beneficial to reducing the skin effect and lowering copper loss.

[0028] 2. By setting the air gap adjustment component, the common-mode inductance and differential-mode inductance can be dynamically changed according to the actual operating state of the inverter power supply. Under different operating conditions, the requirements for suppressing common-mode and differential-mode components may vary. By adjusting the air gap, the filtering effect of common-mode and differential-mode components can be specifically enhanced or weakened, thereby optimizing the output waveform quality of the inverter power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A perspective view of an inductor for a high-efficiency inverter according to embodiment 1 of the present invention;

[0030] Figure 2 1 is a top view of an inductor for a high-efficiency inverter according to embodiment 1 of the present invention;

[0031] Figure 3 For Example 1 of the present invention Figure 2 Cross-sectional view at AA in the middle;

[0032] Figure 4 2 is a perspective view of an inductor for a high-efficiency inverter according to a second embodiment of the present invention;

[0033] Figure 5 1. A top view of an inductor for a high-efficiency inverter according to a second embodiment of the present invention;

[0034] Figure 6 2 is a front view of an inductor for a high-efficiency inverter according to a second embodiment of the present invention;

[0035] Figure 7 This is embodiment 2 of the present invention Figure 5 Cross-sectional view at the middle BB;

[0036] Figure 8 This is embodiment 2 of the present invention Figure 6 Cross-sectional view at CC;

[0037] Figure 9 This is embodiment 2 of the present invention Figure 6 Cross-sectional view at DD in the middle;

[0038] Figure 10 This is a disassembled diagram of a rotating wheel in an inductor for a high-efficiency inverter according to Example 2 of the present invention;

[0039] Figure 11 A perspective view of a rotating wheel in an inductor for a high-efficiency inverter according to a second embodiment of the present invention;

[0040] Figure 12 A perspective view of an air gap in an inductor for a high-efficiency inverter according to a second embodiment of the present invention;

[0041] Figure 13 1 is a front view of an air gap in an inductor for a high-efficiency inverter according to a second embodiment of the present invention.

[0042] In the picture:

[0043] 1. Upper magnetic yoke; 2. Lower magnetic yoke; 3. First magnetic column; 4. Second magnetic column; 5. Third magnetic column; 6. Air gap; 7. First winding; 8. Second winding; 9. Clamp; 10. Tension bolt; 11. Sliding cavity; 12. First sliding column; 13. Second sliding column; 14. Third sliding column; 15. Threaded column; 16. Gear; 17. Elastic sheet; 18. Rotating wheel; 19. Elastic particles; 20. Boss; 21. Concave; 22. Insulating pressure plate; 23. Insulating paper; 24. Fixing bolt; 25. Anti-slip groove. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Example 1, with reference to Figure 1-3 , which is a first embodiment of the present invention, provides an inductor for a high-efficiency inverter, comprising a symmetrically arranged upper magnetic yoke 1 and a lower magnetic yoke 2, wherein a plurality of stacked first magnetic pillars 3, second magnetic pillars 4 and third magnetic pillars 5 are connected side by side between the upper magnetic yoke 1 and the lower magnetic yoke 2, wherein the first magnetic pillars 3 and the third magnetic pillars 5 are symmetrical to each other, the second magnetic pillar 4 is located between the first magnetic pillars 3 and the third magnetic pillars 5, and the second magnetic pillars 4 are spaced equal to the first magnetic pillars 3 and the third magnetic pillars 5, and the plurality of stacked first magnetic pillars 3, second magnetic pillars 4 and third magnetic pillars 5 are respectively provided with air gaps 6 on the stacking surface, the number of air gaps 6 in the first magnetic pillars 3 and the third magnetic pillars 5 is the same and is less than the number of air gaps 6 in the second magnetic pillar 4, a first winding 7 is wound on the first magnetic pillar 3, a second winding 8 is wound on the third magnetic pillar 5, and no wire is wound on the second magnetic pillar 4, the first winding 7 and the second winding 8 are made of the same material and have the same number of turns.

[0046] In this embodiment, the air gaps 6 are made of insulating material. When identical magnetic columns are stacked, one air gap 6 is positioned on the stacking surface. The shape of the air gap 6 is identical to the cross-sectional shape of the column in which it resides. To increase the air gap size within the second magnetic column 4 to be larger than the air gap sizes within the first and third magnetic columns 3 and 5, the height of the second magnetic columns 4 can be shortened, allowing more second magnetic columns 4 to be stacked together, thereby increasing the stacking surface. This allows more air gaps 6 to be added to increase the air gap size within the second magnetic columns 4. The second magnetic columns 4 can be made of the same material as the first and third magnetic columns 3 and 5, or a different material.

[0047] Reference Figure 3 The first magnetic column 3, the second magnetic column 4, and the third magnetic column 5 are made of high-permeability soft magnetic material, which is beneficial to reducing magnetic resistance and making the magnetic field distribution more uniform.

[0048] Reference Figure 1Symmetrical clamping plates 9 are provided on the upper side of the upper magnetic yoke 1 and the lower side of the lower magnetic yoke 2 , and a pair of clamping plates 9 are fixed by tightening bolts 10 .

[0049] In this embodiment, a pair of insert plates are provided with concave cavities matching the upper magnetic yoke 1 and the lower magnetic yoke 2. The upper magnetic yoke 1 and the lower magnetic yoke 2 are respectively engaged in the concave cavities of the upper clamping plate 9 and the lower clamping plate 9.

[0050] Symmetrical clamping plates 9 are provided to enable the upper magnetic yoke 1 and the lower magnetic yoke 2 to press the first magnetic column 3 , the second magnetic column 4 and the third magnetic column 5 .

[0051] Reference Figure 1 Insulating pressing plates 22 are provided on both the upper and lower sides of the first winding 7 and the second winding 8.

[0052] By adopting the above solution, the dielectric strength between windings can be enhanced by setting the insulating pressure plate 22 to prevent high voltage breakdown or short circuit between turns; the coil is fixed by mechanical compression to reduce displacement wear caused by electromagnetic vibration, while optimizing the heat dissipation path.

[0053] Reference Figure 3 Insulation paper 23 is provided between the first magnetic column 3 and the first winding 7 , and between the third magnetic column 5 and the second winding 8 .

[0054] The insulating paper 23 can be provided to provide electrical insulation, electromagnetic interference prevention, mechanical protection, potential isolation, and fix the support winding.

[0055] In other embodiments, the cross-sections of the first magnetic column 3 and the third magnetic column 5 are equal, and the sum of their cross-sectional areas is equal to the cross-sectional area of the second magnetic column 4 .

[0056] The above setting is beneficial to magnetic circuit balance, making the common-mode and differential-mode magnetic flux distribution more reasonable, optimizing inductance performance, enhancing the suppression effect of common-mode and differential-mode components, reducing magnetic loss, and improving the working efficiency and stability of the inductor.

[0057] The working principle of this embodiment: the two sets of converters connected in parallel are staggered, and the output low-frequency fundamental current is the same, and only the carrier of SPWM is staggered by 180° phase angle, so there is a phase difference in the switching ripple between the two sets of converters. Therefore, the output current components of the two sets of inverter power supplies can be decomposed into common-mode components and differential-mode components, among which the low-frequency fundamental wave is the common-mode component, the switching frequency and its odd-order harmonics in the high-frequency ripple are all differential-mode components, and the even-order harmonics are all common-mode components. The differential-mode component accounts for the largest proportion of energy in the high-frequency ripple. If the filter inductor of the inverter power supply can selectively filter out more differential-mode components and less common-mode components, it can greatly alleviate the filtering requirements of the inductor and improve the output waveform quality of the inverter power supply. In a single-phase inductor, a special design is adopted to allow the magnetic lines of force of the common-mode current and the magnetic lines of force of the differential-mode component to close from different paths, so that the common-mode inductance and differential-mode inductance can be designed separately. As Figure 3 In the figure, the magnetic lines of force of the common-mode current magnetic field, as shown by the dotted line frame, will close through the second magnetic column 4, while the magnetic lines of force of the differential-mode current, as shown by the center line frame, do not pass through the second magnetic column 4. This allows the air gap on the second magnetic column 4 to be large, while the air gaps on the first and third magnetic columns 5 to be small, thus forming an inductor with large differential-mode inductance and small common-mode inductance. The first winding 7 and the second winding 8 are each connected to a set of inverter power supplies. The differential-mode components are largely offset in the inductor, while the common-mode components are output externally. This fully utilizes the inductor core and achieves significant filtering effects. Because the two independent inductors are well-suited to solving the problems of high inductor efficiency and high power density: the large differential-mode inductance greatly compresses the high-frequency ripple current, thereby limiting the working magnetic flux density of the high-frequency components, which helps reduce iron loss. The high-frequency current is suppressed, which helps reduce the skin effect and copper loss.

[0058] Example 2, reference Figure 4-13 , which is the second embodiment of the present invention, differs from the first embodiment in that:

[0059] Reference Figure 4-Figure 8 , an air gap adjustment component is provided in the upper clamping plate 9; the air gap adjustment component includes three sliding cavities 11 provided in the upper magnetic yoke 1, the positions and sizes of the three sliding cavities 11 correspond to the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 respectively, and the sliding cavity 11 is provided with a first sliding column 12, a second sliding column 13 and a third sliding column 14, which are respectively located above the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5, and a threaded column 15 is provided in the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5. The upper end of the threaded column 15 is rotatably provided in the upper clamping plate 9, and each threaded column 15 is connected to a gear 16, and the gears 16 on the threaded columns 15 on both sides are engaged with the gear 16 on the middle threaded column 15.

[0060] The first and second sliding posts 12, 13 and 14 are connected to each other by a key, and the first and second sliding posts 12, 13 and 14 are connected to each other by a key.

[0061] Reference Figure 12-13 The air gap sheet 6 is provided with a plurality of elastic sheets 17 protruding in the upward and downward directions, and the elastic sheets 17 protruding in the upward and downward directions are staggered on the air gap sheet 6.

[0062] In this embodiment, the elastic sheet 17 expands equidistantly in the upward and downward directions. The elastic sheet 17 causes the air gaps at the stacking surfaces of the multiple stacked magnetic columns to increase or decrease equidistantly when the pressure increases or decreases.

[0063] By providing the elastic sheet 17 , when the gap between the magnetic columns is increased, the air gap sheet 6 can fill the gap.

[0064] Reference Figure 7 The upper end of the threaded column 15 in the middle is passed through the upper splint 9 and is connected to a rotating wheel 18. The rotating wheel 18 is fixed to the top of the middle threaded column 15 by a fixing bolt 24. The edge of the rotating wheel 18 is provided with anti-slip grooves 25.

[0065] A rotating wheel 18 is provided for manually rotating the threaded column 15 in the middle.

[0066] Reference Figure 11-12 Elastic particles 19 are provided near the edge of the lower end surface of the rotating wheel 18, and a boss 20 is provided on the splint 9 below the rotating wheel 18. Pits 21 are provided on the boss 20 at equal intervals in a ring shape. The elastic particles 19 are engaged in the pits 21 when rotating.

[0067] The elastic particles 19 and the dimples 21 are provided to increase the rotational damping of the rotating wheel 18 and simultaneously enable the rotating wheel 18 to be adjusted at equal angles.

[0068] The working principle of this embodiment is as follows: by rotating the rotating wheel 18, the middle threaded column 15 rotates. Since the second sliding column 13 is restricted to slide vertically in the sliding cavity 11, as the middle threaded column 15 rotates, the second sliding column 13 slides upward, and the air gap between the stacking surfaces of the second magnetic column 4 increases; at the same time, the gears 16 on both sides rotate in opposite directions to the middle gear 16, causing the threaded columns 15 on both sides to rotate in opposite directions to the middle threaded column 15. As the threaded columns 15 on both sides rotate, the first sliding column 12 and the third sliding column 14 slide downward, respectively squeezing the first magnetic column 3 and the third magnetic column 5, so that the air gap between the stacking surfaces of the first magnetic column 3 and the third magnetic column 5 is reduced, thereby dynamically adjusting the size of the air gap. This arrangement can:

[0069] Flexible Inductance Adjustment: The common-mode and differential-mode inductances can be dynamically adjusted based on the actual operating state of the inverter. Because the requirements for suppressing common-mode and differential-mode components may vary under different operating conditions, adjusting the air gap can specifically enhance or weaken the filtering effect on common-mode and differential-mode components, thereby optimizing the inverter's output waveform quality.

[0070] Adapting to load changes: When the inverter's load changes, the ratio and amplitude of the common-mode and differential-mode components in the output current also change accordingly. The air gap adjustment component can adjust the air gap in real time, ensuring that the reactor always maintains the optimal filtering state, effectively addressing the impact of load changes and ensuring stable operation of the inverter.

[0071] Further reducing losses: As mentioned above, a larger differential-mode inductance can limit the operating magnetic flux density of high-frequency components, reducing iron losses, suppressing high-frequency currents, and reducing copper losses. By adjusting the air gap component, the differential-mode inductance can be further optimized according to actual operating conditions, keeping both iron and copper losses as low as possible under different operating conditions, thereby improving the efficiency of the inverter power supply.

[0072] Improve power density: Under the premise of meeting the filtering requirements, by dynamically adjusting the air gap to optimize the performance of the reactor, the reactor can be made more compact in design, reducing the volume and weight, thereby improving the power density of the entire inverter power supply system and better meeting the high power density requirements of the project.

[0073] Enhanced system robustness: In actual operation, inverters may be affected by various interference and uncertainties, such as grid voltage fluctuations and ambient temperature changes. The air gap adjustment component can make the reactor more adaptable to these changes, enhancing the robustness of the inverter system and improving system reliability and stability.

[0074] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-efficiency inverter inductor, characterized in that: The invention comprises an upper magnetic yoke (1) and a lower magnetic yoke (2) which are symmetrically arranged, wherein a plurality of stacked first magnetic columns (3), second magnetic columns (4) and third magnetic columns (5) are connected side by side between the upper magnetic yoke (1) and the lower magnetic yoke (2), wherein the first magnetic column (3) and the third magnetic column (5) are symmetrical to each other, the second magnetic column (4) is located between the first magnetic column (3) and the third magnetic column (5), and the spacing between the second magnetic column (4) and the first magnetic column (3) and the third magnetic column (5) is equal, and the plurality of stacked first magnetic columns (3), the second magnetic column (4) and the third magnetic column (5) are respectively provided with air gap pieces (6) on the stacking surface; the number of air gap pieces (6) in the first magnetic column (3) and the third magnetic column (5) is the same and is smaller than the number of air gap pieces (6) in the second magnetic column (4); a first winding (7) is wound on the first magnetic column (3), a second winding (8) is wound on the third magnetic column (5), and no winding is wound on the second magnetic column (4); the first winding (7) and the second winding (8) are made of the same material and have the same number of winding turns.

2. The high-efficiency inverter inductor according to claim 1, wherein: The first magnetic column (3), the second magnetic column (4), and the third magnetic column (5) are made of high-permeability soft magnetic material.

3. The high-efficiency inverter inductor according to claim 2, wherein: Symmetrical clamping plates (9) are provided on the upper side of the upper magnetic yoke (1) and the lower side of the lower magnetic yoke (2), and a pair of clamping plates (9) are fixed by tightening bolts (10).

4. The high-efficiency inverter inductor according to claim 3, wherein: An air gap adjustment component is provided in the upper clamping plate (9); The air gap adjustment component includes three sliding cavities (11) arranged in the upper magnetic yoke (1), the positions and sizes of the three sliding cavities (11) respectively correspond to the first magnetic column (3), the second magnetic column (4) and the third magnetic column (5), and the sliding cavities (11) are respectively provided with a first sliding column (12), a second sliding column (13) and a third sliding column (14), which are respectively located above the first magnetic column (3), the second magnetic column (4) and the third magnetic column (5). The first magnetic column (3), the second magnetic column (4) and the third magnetic column (5) are each provided with a threaded column (15), the upper end of the threaded column (15) is rotatably arranged in the upper clamping plate (9), and each threaded column (15) is connected to a gear (16), and the gears (16) on the threaded columns (15) on both sides are meshed with the gear (16) on the middle threaded column (15).

5. The high-efficiency inverter inductor according to claim 4, wherein: The air gap sheet (6) is provided with a plurality of elastic sheets (17) protruding in the upward and downward directions, and the elastic sheets (17) protruding in the upward and downward directions are staggeredly distributed on the air gap sheet (6).

6. The high-efficiency inverter inductor according to claim 4, wherein: The upper end of the threaded column (15) located in the middle passes through the upper clamping plate (9) and is connected to a rotating wheel (18).

7. The high-efficiency inverter inductor according to claim 6, wherein: The lower end surface of the rotating wheel (18) is provided with elastic particles (19) near the edge, and a boss (20) is provided on the clamping plate (9) below the rotating wheel (18). The boss (20) is provided with annular pits (21) at equal intervals, and the elastic particles (19) are engaged in the pits (21) when rotating.

8. The high-efficiency inverter inductor according to claim 1, wherein: Insulating pressure plates (22) are provided on the upper and lower sides of the first winding (7) and the second winding (8).

9. The high-efficiency inverter inductor according to claim 1, wherein: Insulating paper (23) is provided between the first magnetic column (3) and the first winding (7), and between the third magnetic column (5) and the second winding (8).

10. The high-efficiency inverter inductor according to claim 1, wherein: The cross sections of the first magnetic column (3) and the third magnetic column (5) are equal, and the sum of their cross sections is equal to the cross section of the second magnetic column (4).

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