Multi-power frequency converter for coal mining machine and manufacturing method of multi-power frequency converter

Abstract

The invention relates to a multi-power frequency converter for a coal mining machine and a manufacturing method thereof. The frequency converter comprises a rectification loop which is used for converting an alternating current power supply into a direct current power supply. The inversion loop is used for inverting the direct-current power supply into an alternating-current power supply; the control circuit is used for driving the frequency converter; the direct current bus capacitor is used for compensating the difference between the power required by the inversion loop and the output power of the rectification loop; and the expansion capacitor is connected in parallel with the direct current bus capacitor, and the expansion capacitor is used for improving the power of the frequency converter. According to the frequency converter, the power of the frequency converter is improved through expansion of the direct-current bus capacitor, and the expansion capacitor is arranged outside the frequency converter box body, so that the size of the frequency converter box body is reduced, and the power test of the frequency converter is simpler and more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment for coal mining machines; in particular, the present invention relates to a multi-power frequency converter for coal mining machines and a manufacturing method thereof. Background Art

[0002] Normally, the traction and cutting parts of a coal mining machine need to be controlled by a frequency converter, but high-power frequency converters occupy a large volume of the coal mining machine's electrical control box and have poor heat dissipation, which is not conducive to the normal operation of the equipment. In addition, the batch production cost of frequency converters that increase power by improving IGBT is high, and their power is fixed, which cannot meet the multi-power requirements of coal mining equipment. Summary of the invention

[0003] In view of this, the present invention provides a multi-power frequency converter for a coal mining machine and a manufacturing method thereof, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0004] In order to achieve the above-mentioned object, a first aspect of the present invention provides a multi-power frequency converter for a coal mining machine, wherein the frequency converter comprises: A rectifier circuit, the rectifier circuit is used to convert an AC power supply into a DC power supply; An inverter circuit, the inverter circuit is used to invert the DC power supply into an AC power supply; A control circuit, wherein the control circuit is used to drive the frequency converter; A DC bus capacitor, the DC bus capacitor is used to compensate for the difference between the power required by the inverter circuit and the output power of the rectifier circuit; An extended capacitor is connected in parallel to the DC bus capacitor and is used to increase the power of the inverter.

[0005] In the frequency converter as described above, optionally, the rectifier circuit is connected to the DC bus capacitor, the extended capacitor and the inverter circuit in sequence, and the DC bus capacitor is connected between the rectifier circuit and the inverter circuit.

[0006] In the inverter as described above, optionally, the inverter includes a heat sink, a left side plate, a front side plate assembly, an upper side plate, a rear side plate, an IGBT drive plate and a right side plate, a control assembly, a laminated busbar, an absorption capacitor module and an IGBT module, The control component, the laminated busbar and absorption capacitor module, the IGBT module, and the DC bus capacitor are integrated on the heat sink; the front side panel assembly, the upper side panel, the rear side panel, the right side panel, and the IGBT drive panel surround the control component, the laminated busbar and absorption capacitor module, the IGBT module, and the DC bus capacitor into a closed box; the extended capacitor is located outside the closed box; the inverter circuit includes the laminated busbar and absorption capacitor module and the IGBT module; the rectifier circuit includes the IGBT module; and the control circuit is located in the control component.

[0007] In the inverter as described above, optionally, the DC bus capacitor has a first positive and negative terminal and a second positive and negative terminal, the first positive and negative terminal is used to realize the connection between the DC bus capacitor and the laminated busbar and the absorption capacitor module, and the second positive and negative terminal is used to realize the connection between the DC bus capacitor and the extended capacitor.

[0008] In the inverter as described above, optionally, the extended capacitor has a first connection hole, a second connection hole and a third positive and negative terminal, the first connection hole is used to connect the extended capacitor to the heat sink, the second connection hole is used to connect the extended capacitor to the right side plate, and the third positive and negative terminal is used to connect the second positive and negative terminals.

[0009] In order to achieve the aforementioned purpose, the second aspect of the present invention provides a method for manufacturing a multi-power frequency converter for a coal mining machine, wherein the frequency converter is composed of a heat sink, a left side plate, a front side plate assembly, an upper side plate, a rear side plate, an IGBT drive plate and a right side plate, a control assembly, a laminated busbar and an absorption capacitor module, an IGBT module and a DC bus capacitor, the laminated busbar and the absorption capacitor module and the IGBT module constitute an inverter circuit and a rectifier circuit, the control assembly includes a control circuit, and the DC bus capacitor is connected between the rectifier circuit and the inverter circuit; The manufacturing method comprises: Step A: Integrate the control assembly, the laminated busbar and the absorption capacitor module, the IGBT module, and the DC bus capacitor on the heat sink; Step B: enclosing the control assembly, the laminated busbar and absorption capacitor module, the IGBT module, and the DC bus capacitor into a closed box through the front side panel assembly, the upper side panel, the rear side panel, the right side panel, and the IGBT drive board; Step C: connecting the extended capacitor located outside the box in parallel with the DC bus capacitor; Step D: continuously replace the extended capacitor and debug the inverter until the power output by the inverter reaches a preset threshold.

[0010] In the manufacturing method as described above, optionally, in the step D, the threshold value is 160kw, 200kw, 250kw, 315kw and 400kw.

[0011] In the manufacturing method as described above, optionally, an IGBT module is provided in the inverter circuit, and the IGBT module adopts Sic-IGBT.

[0012] In the manufacturing method as described above, optionally, the DC bus capacitor and the extended capacitor are thin-film integrated square capacitors, and the DC bus capacitor and the extended capacitor are filled with glue.

[0013] In the manufacturing method as described above, optionally, the left side plate, the front side plate assembly, the upper side plate, the rear side plate, the right side plate and the IGBT driver plate are all made of stainless steel.

[0014] The inverter of the present invention realizes the improvement of the inverter power by expanding the DC bus capacitor, and the expansion capacitor is placed outside the inverter box, which not only reduces the volume of the inverter box but also makes the inverter power test easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present invention will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings: Figure 1 A schematic block diagram of an embodiment of a multi-power frequency converter for a coal mining machine according to the present invention; Figure 2 It is a structural schematic diagram of an embodiment of a multi-power frequency converter for a coal mining machine of the present invention; Figure 3 A schematic structural diagram of a DC bus capacitor of an inverter according to an embodiment of the present invention; Figure 4 A schematic diagram of the structure of an embodiment of an extended capacitor of a frequency converter of the present invention; and Figure 5 The present invention is a flow chart of an embodiment of a method for manufacturing a multi-power frequency converter for a coal mining machine according to the present invention.

[0016] Figure markings: 1-heat sink; 2-left side panel; 3-front side panel assembly; 4-control assembly; 5-upper side panel; 6-DC bus capacitor; 7-rear side panel; 8-extension capacitor; 9-laminated busbar and absorption capacitor module; 10-IGBT module; 11-IGBT drive board; 12-right side panel; 13-first positive and negative terminals; 14-second positive and negative terminals; 15-third positive and negative terminals; 16-first connecting hole; 17-second connecting hole. DETAILED DESCRIPTION

[0017] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of a multi-power frequency converter for a coal mining machine and a manufacturing method thereof of the present invention will be described below in an exemplary manner. However, all descriptions should not be used to form any limitation on the present invention.

[0018] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the accompanying drawings, the present invention still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to the present invention are also within the scope of the description of this document.

[0019] It should also be noted that the orientation or positional relationship indicated by the terms "inside" and "outside" is based on the orientation or positional relationship of the inverter shown in the accompanying drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0020] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features.

[0021] Figure 1 The schematic block diagram of an embodiment of a multi-power frequency converter for a coal mining machine of the present invention. In this embodiment, the frequency converter may include a rectifier circuit, an inverter circuit, a control circuit (not shown in the figure), a DC bus capacitor 6 and an extension capacitor 8. The rectifier circuit is used to convert an AC power supply into a DC power supply, the inverter circuit is used to invert a DC power supply into an AC power supply, and the control circuit is used to drive the frequency converter. The DC bus capacitor 6 is connected between the rectifier circuit and the inverter circuit to compensate for the difference between the power required by the inverter circuit and the output power of the rectifier circuit. In order to increase the power of the frequency converter, the present invention connects the extension capacitor 8 in parallel with the DC bus capacitor 6.

[0022] from Figure 1It can be seen that the rectifier circuit is connected to the DC bus capacitor 6, the extended capacitor 8 and the inverter circuit in sequence. The calculation formula of the DC bus capacitor 6 is C=1.2×P÷U^2, where P is power, U is rated voltage, and C is capacitance value. It can be seen that connecting the extended capacitor 8 in parallel on both sides of the DC bus capacitor 6 can effectively increase the power of the inverter.

[0023] Figure 2 It is a schematic structural diagram of an embodiment of a multi-power frequency converter for a coal mining machine of the present invention. In this embodiment, the frequency converter may include a heat sink 1, a left side plate 2, a front side plate assembly 3, an upper side plate 5, a rear side plate 7, an IGBT drive plate 11 and a right side plate 12, a control assembly 4, a laminated busbar and absorption capacitor module 9 and an IGBT module 10. The control assembly 4, the laminated busbar and absorption capacitor module 9, the IGBT module 10, and the DC bus capacitor 6 are integrated on the heat sink 1, and the front side plate assembly 3, the upper side plate 5, the rear side plate 7, the right side plate 12 and the IGBT drive plate 11 surround the control assembly 4, the laminated busbar and absorption capacitor module 9, the IGBT module 10, and the DC bus capacitor 6 into a closed box. The extended capacitor 8 is located outside the closed box, thereby reducing the volume of the electric control box for the coal mining machine. The above-mentioned inverter circuit includes Figure 2 The laminated busbar and absorption capacitor module 9 and IGBT module 10 are included in the rectifier circuit, and the control circuit is located in the control component 4.

[0024] Specifically, the power first enters the inverter through the power socket near the heat sink 1. The inverter first converts the input AC power into DC power through a rectifier circuit. This process is carried out inside the inverter and involves multiple components. Subsequently, the DC bus capacitor 6 inside the inverter balances the DC bus voltage to prevent it from fluctuating and filters interference from the power supply and other electronic devices. The external extended DC capacitor of the inverter connected in parallel with the DC bus capacitor 6 inside the inverter can further enhance the stability and filtering effect of the DC power supply and increase the power of the inverter.

[0025] The inverter and IGBT driver board 11 are used to convert the DC power supply into AC power supply again, and the frequency and voltage of the AC power supply converted in this way are controllable. The laminated busbar and absorption capacitor module 9 are used to provide the stable current and voltage required by the inverter, while absorbing and eliminating the harmonics generated by the operation of the inverter. The control component 4 receives signals from the outside (such as speed setting, direction control, etc.), and calculates the required output frequency and voltage based on these signals through the internal microprocessor or other control logic. In addition, the control component 4 is used to monitor and protect various parameters of the inverter, such as temperature, current, voltage, etc., to ensure its safe operation.

[0026] In addition, the left side plate 2, the front side plate assembly 3, the upper side plate 5, the rear side plate 7 and the right side plate 12 constitute the housing of the inverter, which is used to protect the internal electronic components from the external environment. The heat sink 1 located below can ensure that the inverter can effectively dissipate heat when running at high load.

[0027] In this embodiment, the IGBT module 10 adopts Sic-IGBT. When the IGBT module 10 in the inverter adopts SiC (silicon carbide) technology, the performance of the IGBT module 10 in high temperature, high frequency and high voltage environments will be significantly improved: the insulation breakdown field strength of SiC material is 10 times that of Si (silicon), so that SiC devices can operate at higher voltages without breakdown. In addition, SiC devices can operate at higher temperatures than Si devices, which helps to reduce cooling requirements and system costs. At the same time, the high temperature stability of SiC enables the IGBT module 10 using SiC technology to withstand higher temperatures, thereby improving the reliability and life of the inverter. In addition, the maximum rated current of the Sic-IGBT of the present invention is 600A, and the maximum design power can reach 400kw. The power consumption of the Sic-IGBT itself is very low, less than half of the power consumption of the conventional IGBT module 10.

[0028] In this embodiment, the DC bus capacitor 6 and the extended capacitor 8 are thin-film integrated square capacitors, and the DC bus capacitor 6 and the extended capacitor 8 are internally processed with glue, and the shock resistance reaches 8G, which is higher than the 5G national standard. The left side plate 2, the front side plate assembly 3, the upper side plate 5, the rear side plate 7, the right side plate 12 and the IGBT driver plate 11 are all made of stainless steel, forming a closed box, which increases the EMC anti-interference and shock resistance.

[0029] The main material of the heat sink 1 of the present invention is 6063 aluminum. A VC temperature averaging plate is designed below the contact surface between the IGBT module 10 and the heat sink 1. The VC temperature averaging plate has a higher thermal conductivity than the heat pipe VC temperature averaging plate. Under the same conditions, the thermal conductivity of the temperature averaging plate is 20-30% higher than that of the heat pipe.

[0030] Figure 3 is a schematic structural diagram of an embodiment of a DC bus capacitor of a frequency converter of the present invention, Figure 3 Figure (a) is a front view of the DC bus capacitor 6, and Figure (b) is a top view of the DC bus capacitor 6. Figure 3 It can be seen that the DC bus capacitor 6 has a first positive and negative terminal 13 and a second positive and negative terminal 14. The first positive and negative terminal 13 is used to connect the DC bus capacitor 6 with the laminated busbar and the absorption capacitor module 9, and the second positive and negative terminal 14 is used to connect the DC bus capacitor 6 with the extended capacitor 8.

[0031] Figure 4is a schematic structural diagram of an embodiment of an extended capacitor of a frequency converter of the present invention, Figure 4 Figure (c) is a top view of the extended capacitor 8, Figure (d) is a side view of the extended capacitor 8, and Figure (e) is a front view of the extended capacitor 8. Figure 4 It can be seen that the extended capacitor 8 has a first connection hole 16, a second connection hole 17 and a third positive and negative wiring terminal 15. The first connection hole 16 is used to connect the extended capacitor 8 to the inverter heat sink 1, the second connection hole 17 is used to connect the extended capacitor 8 to the inverter right side plate 12, and the third positive and negative wiring terminal 15 is used to connect the second positive and negative wiring terminal 14. The length L and height H are the same, and the capacitance of the extended capacitor 8 is related to the width W.

[0032] The present invention also proposes a method for manufacturing a multi-power inverter for a coal mining machine. The inverter includes a heat sink 1, a left side plate 2, a front side plate assembly 3, an upper side plate 5, a rear side plate 7, an IGBT drive plate 11 and a right side plate 12, a control assembly 4, a laminated busbar and absorption capacitor module 9, an IGBT module 10 and a DC bus capacitor 6. The laminated busbar and absorption capacitor module 9 and the IGBT module 10 constitute an inverter circuit and a rectifier circuit. The control assembly 4 includes a control circuit. The DC bus capacitor 6 is connected between the rectifier circuit and the inverter circuit.

[0033] Figure 5 FIG. 1 is a flow chart of an embodiment of a method for manufacturing a multi-power frequency converter for a coal mining machine according to the present invention. Figure 5 As can be seen from the figure, the manufacturing method may include four steps: setting up the circuit, closing the box, installing the extended capacitor, and testing the power. Each step is described in detail below.

[0034] Step A is used to set up the circuit. In step A, the control assembly 4 , the laminated busbar and absorption capacitor module 9 , the IGBT module 10 , and the DC bus capacitor 6 are integrated on the heat sink 1 .

[0035] Step B is used to close the box. In step B, the control assembly 4, the laminated busbar and absorption capacitor module 9, the IGBT module 10, and the DC bus capacitor 6 are surrounded by the front side panel assembly 3, the upper side panel 5, the rear side panel 7, the right side panel 12, and the IGBT driver board 11 to form a closed box.

[0036] Step C is used to install the extended capacitor 8. In step C, the extended capacitor 8 located outside the box is connected in parallel to the DC bus capacitor 6.

[0037] Step D is used to test the power. In step D, the expansion capacitor 8 is continuously replaced and the inverter is debugged until the power output by the inverter reaches a preset threshold. In this embodiment, the threshold can be 160kw, 200kw, 250kw, 315kw and 400kw. In other optional embodiments, the staff can select a suitable threshold according to the working scene and equipment needs.

[0038] In this embodiment, the IGBT module 10 uses Sic-IGBT, the DC bus capacitor 6 and the extended capacitor 8 are thin-film integrated square capacitors, and the DC bus capacitor 6 and the extended capacitor 8 are internally processed with glue, and the shock resistance reaches 8G, which is higher than the 5G national standard. The left side plate 2, the front side plate assembly 3, the upper side plate 5, the rear side plate 7, the right side plate 12 and the IGBT driver plate 11 are all made of stainless steel, forming a closed box, which increases the EMC anti-interference and shock resistance.

[0039] The main material of the heat sink 1 of the present invention is 6063 aluminum. A VC temperature averaging plate is designed below the contact surface between the IGBT module 10 and the heat sink 1. The VC temperature averaging plate has a higher thermal conductivity than the heat pipe VC temperature averaging plate. Under the same conditions, the thermal conductivity of the temperature averaging plate is 20-30% higher than that of the heat pipe.

[0040] In recent years, coal mining machines have developed rapidly towards intelligence. The development demand for intelligence has led to coal mining machines being equipped with various sensors and control modules, which has led to the continuous increase in the size of the electric control box. When working in a coal mine, the size of the electric control box is strictly limited, especially the electric control box on a coal mining machine with a power supply voltage of 1140V. This type of coal mining machine is mainly used in thin coal seams or coal seams with large inclination angles, and has extremely high requirements for the size of the electric control box. Using 1140V variable frequency speed regulation in the traction part can eliminate the traction transformer, greatly saving the space of the electric control box.

[0041] In addition, when the shearer's cutting motor adopts direct start mode, when encountering a hard rock layer or hard coal layer, the drum wears very seriously and reduces the life of the rocker arm. At the same time, large sparks will bring safety hazards and cause the shearer to be unable to increase the speed when cutting the coal seam to increase production capacity. Therefore, when conditions permit, the shearer's cutting motor should be regulated by a frequency converter, which can not only increase the life of the drum and rocker arm, but also increase production capacity and reduce safety hazards.

[0042] The inverter of the present invention achieves the improvement of the inverter power by expanding the DC bus capacitor 6, and the expansion capacitor 8 is placed outside the inverter housing, which not only reduces the volume of the inverter housing, but also makes the inverter power test easier. In some cases, especially when the inverter is purchased in batches, according to the manufacturing method of the present invention, it is only necessary to replace the already set expansion capacitor 8 with the purchased fixed model of the inverter of the present invention. The manufacturing method has the advantages of low cost and easy operation.

[0043] In summary, the frequency converter of the present invention is a 1140V four-quadrant frequency converter, which is a complete 110kw frequency converter, and then expanded to 400kw by connecting an external extended DC capacitor in parallel. In some cases, it can be combined with a 110kw basic frequency converter to form five four-quadrant 1140V frequency converters of 160kw, 200kw, 250kw, 315kw, and 400kw. It can meet the needs of traction frequency conversion and speed regulation, as well as the needs of cutting motors within 400kw. The frequency converter manufacturing method of the present invention can reduce the types of frequency converters, help technicians concentrate on research and development, improve the performance of frequency converters, and help the production of frequency converters to achieve standardized production and improve production efficiency. At the same time, it reduces the number of parts, which is beneficial for warehouses to reduce inventory and improve material turnover and capital utilization.

[0044] The inverter manufacturing method of the present invention realizes multiple power inverters by adding a basic inverter to an external extended capacitor 8. The components, control methods, and wiring methods used in the basic inverter are completely consistent, and can be used for speed regulation of the traction motor of the coal mining machine. The high-power inverter obtained by expanding the manufacturing method of the present invention can be used for speed regulation of the cutting motor of the coal mining machine. In addition, the IGBT module 10 used in the inverter of the present invention adopts Sic technology, has large current, low power consumption, and the heat sink 1 adopts a VC temperature plate. The internal DC bus capacitor 6 and the external extended capacitor 8 of the inverter both adopt an integrated square capacitor, which has a good anti-seismic effect.

[0045] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above implementation without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A multi-power frequency converter for a coal mining machine, characterized in that: The frequency converter comprises: A rectifier circuit, wherein the rectifier circuit is used to convert an AC power source into a DC power source; An inverter circuit, the inverter circuit is used to invert the DC power supply into an AC power supply; A control circuit, wherein the control circuit is used to drive the frequency converter; A DC bus capacitor (6), the DC bus capacitor (6) being used to compensate for the difference between the power required by the inverter circuit and the output power of the rectifier circuit; An extended capacitor (8), the extended capacitor (8) is connected in parallel to the DC bus capacitor (6), and the extended capacitor (8) is used to increase the power of the inverter.

2. The frequency converter according to claim 1, characterized in that: The rectifier circuit is connected to the DC bus capacitor (6), the extended capacitor (8) and the inverter circuit in sequence, and the DC bus capacitor (6) is connected between the rectifier circuit and the inverter circuit.

3. The frequency converter according to claim 2, characterized in that: The frequency converter comprises a heat sink (1), a left side plate (2), a front side plate assembly (3), an upper side plate (5), a rear side plate (7), an IGBT drive plate (11), a right side plate (12), a control assembly (4), a laminated busbar and absorption capacitor module (9), and an IGBT module (10). The control component (4), the laminated busbar and absorption capacitor module (9), the IGBT module (10), and the DC bus capacitor (6) are integrated on the heat sink (1); the front side plate component (3), the upper side plate (5), the rear side plate (7), the right side plate (12), and the IGBT drive plate (11) surround the control component (4), the laminated busbar and absorption capacitor module (9), the IGBT module (10), and the DC bus capacitor (6) to form a closed box; the extended capacitor (8) is located outside the closed box; the inverter circuit includes the laminated busbar and absorption capacitor module (9) and the IGBT module (10); the rectifier circuit includes the IGBT module (10); and the control circuit is located in the control component (4).

4. The frequency converter according to claim 3, characterized in that: The DC bus capacitor (6) has a first positive and negative wiring terminal (13) and a second positive and negative wiring terminal (14); the first positive and negative wiring terminals (13) are used to connect the DC bus capacitor (6) to the laminated busbar and absorption capacitor module (9); and the second positive and negative wiring terminals (14) are used to connect the DC bus capacitor (6) to the extended capacitor (8).

5. The frequency converter according to claim 4, characterized in that: The extended capacitor (8) has a first connection hole (16), a second connection hole (17) and third positive and negative wiring terminals (15); the first connection hole (16) is used to connect the extended capacitor (8) to the heat sink (1); the second connection hole (17) is used to connect the extended capacitor (8) to the right side plate (12); and the third positive and negative wiring terminals (15) are used to connect the second positive and negative wiring terminals (14).

6. A method for manufacturing a multi-power frequency converter for a coal mining machine, characterized in that: The frequency converter comprises a heat sink (1), a left side plate (2), a front side plate assembly (3), an upper side plate (5), a rear side plate (7), an IGBT drive plate (11) and a right side plate (12), a control assembly (4), a laminated busbar and absorption capacitor module (9), an IGBT module (10) and a DC bus capacitor (6); the laminated busbar and absorption capacitor module (9) and the IGBT module (10) constitute an inverter circuit and a rectifier circuit; the control assembly (4) comprises a control circuit; and the DC bus capacitor (6) is connected between the rectifier circuit and the inverter circuit; The manufacturing method comprises: Step A: integrating the control component (4), the laminated busbar and absorption capacitor module (9), the IGBT module (10), and the DC bus capacitor (6) on the heat sink (1); Step B: the control assembly (4), the laminated busbar and absorption capacitor module (9), the IGBT module (10), and the DC bus capacitor (6) are enclosed into a closed box by means of the front side panel assembly (3), the upper side panel (5), the rear side panel (7), the right side panel (12), and the IGBT drive panel (11); Step C: connecting the extended capacitor (8) located outside the box in parallel with the DC bus capacitor (6); Step D: continuously replacing the extended capacitor (8) and debugging the inverter until the power output by the inverter reaches a preset threshold value.

7. The manufacturing method according to claim 6, characterized in that: In the step D, the threshold values ​​are 160kw, 200kw, 250kw, 315kw and 400kw.

8. The manufacturing method according to claim 6, characterized in that: An IGBT module (10) is provided in the inverter circuit, and the IGBT module (10) adopts a Sic-IGBT.

9. The manufacturing method according to claim 6, characterized in that: The DC bus capacitor (6) and the extended capacitor (8) are thin-film integrated square capacitors, and the DC bus capacitor (6) and the extended capacitor (8) are internally filled with glue.

10. The manufacturing method according to claim 6, characterized in that: The left side plate (2), the front side plate assembly (3), the upper side plate (5), the rear side plate (7), the right side plate (12) and the IGBT drive plate (11) are all made of stainless steel.

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