Frequency converter

Abstract

The utility model discloses a frequency converter, and relates to the technical field of frequency converters, the frequency converter comprises a housing, a frequency conversion assembly and a control assembly, the frequency conversion assembly is arranged in the housing; the control assembly is arranged in the shell and is in electric signal connection with the frequency conversion assembly; the control assembly comprises a shell, a control module, an expansion module and a grounding plate, the shell is a sheet metal part, and the shell is arranged on the inner wall of the shell; the control module is arranged on the inner side face of the shell and located between the shell and the inner wall of the outer shell, the expansion module is arranged on the outer side face of the shell, the grounding plate is arranged on the outer side face of the shell, and the control module and the expansion module are both in electric signal connection with the grounding plate. According to the technical scheme of the utility model, the grounding plate is arranged on the shell, and the control module and the expansion module are both in electric signal connection with the grounding plate, so that the grounding process of the control assembly can be simplified, and the grounding difficulty of the control assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, and particularly relates to a frequency converter. Background Art

[0002] A frequency converter is a power control device that applies frequency conversion technology and microelectronics technology to control an AC motor by changing the frequency of the motor's working power supply. Because of its precise speed regulation ability and good energy-saving effect, it has been widely used in many fields such as industrial production, transportation, and household appliances. However, when installing the control components of the existing frequency converter, there is a problem of great difficulty in grounding.

[0003] Therefore, it is necessary to provide a new frequency converter to solve the above technical problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a frequency converter, aiming to solve the technical problem of great difficulty in grounding the control components of the existing frequency converter.

[0005] To achieve the above purpose, a frequency converter proposed by the utility model includes:

[0006] A housing;

[0007] A frequency conversion component, which is arranged inside the housing;

[0008] A control component, which is arranged inside the housing and is electrically connected to the frequency conversion component;

[0009] The control component includes a housing, a control module, an expansion module, and a grounding plate. The housing is a sheet metal part and is arranged on the inner wall of the housing; the control module is arranged on the inner side surface of the housing and is located between the housing and the inner wall of the housing, and the expansion module is arranged on the outer side surface of the housing; the grounding plate is arranged on the outer side surface of the housing, and both the control module and the expansion module are electrically connected to the grounding plate.

[0010] In an embodiment, the housing is a conductive part, the housing is provided with riveting posts, and the control module is arranged on the riveting posts and is electrically connected to the grounding plate through the riveting posts.

[0011] In an embodiment, the number of the riveting posts is multiple, and the multiple riveting posts are evenly distributed on the housing.

[0012] In an embodiment, the housing is a heat-conducting part, the control module includes a bottom plate and a power supply unit arranged on the bottom plate, the bottom plate is arranged on the inner side surface of the housing, and a heat-conducting block is arranged between the power supply unit and the inner side surface of the housing.

[0013] In one embodiment, the control module further includes a plurality of wiring terminals, which are arranged in a ring shape on the bottom plate and extend out of the housing.

[0014] In one embodiment, the bottom plate is provided with an indicator light, and the control assembly further includes a light guide column provided corresponding to the indicator light, and the light guide column is exposed to the housing.

[0015] In one embodiment, the expansion module includes a communication expansion card and a pulse generator card, wherein the communication expansion card and the pulse generator card are spaced apart from each other in the housing and are both electrically signal-connected to the ground plate.

[0016] In one embodiment, the shell is provided with mounting posts at positions corresponding to the communication expansion card and the pulse generator card; the communication expansion card and the pulse generator card are arranged on the corresponding mounting posts and are electrically connected to the ground plate through the corresponding mounting posts.

[0017] In one embodiment, an insulating sheet is provided between the expansion module and the housing.

[0018] In one embodiment, the shell includes a first bending portion, a connecting portion, and a second bending portion connected in sequence, the first bending portion, the connecting portion, and the second bending portion are arranged to form a accommodating cavity, the first bending portion and the second bending portion are both arranged on the inner wall of the shell, the control module is arranged on the side of the connecting portion facing the inner wall of the shell, and an insulating sheet is arranged between the expansion module and the side of the connecting portion facing away from the inner wall of the shell.

[0019] In one embodiment, the number of the frequency conversion components is two, the housing is formed with a control cavity and two accommodating cavities, the control component is arranged in the control cavity, and the two frequency conversion components are arranged in the two accommodating cavities one by one and are both connected to the control component by electrical signals.

[0020] The technical solution of the present utility model can simplify the grounding process of the control assembly and reduce the grounding difficulty of the control assembly by providing a grounding plate on the housing and electrically connecting both the control module and the expansion module to the grounding plate. In this embodiment, the control assembly is electrically connected to the frequency conversion assembly and is used to control the operation of the frequency conversion assembly; the control module is arranged on the inner side surface of the housing, that is, the housing covers the control module, which can better protect the control module to avoid damage. The grounding plate is arranged on the outer side surface of the housing, facilitating the construction personnel to ground it. Electrically connecting the grounding points of both the control module and the expansion module to the grounding plate can simplify the grounding process of the control assembly and reduce the grounding difficulty of the control assembly. Specifically, after the installation of the control assembly is completed, the construction personnel only need to connect the external grounding wire to the grounding plate to achieve the grounding of the control module and the expansion module, without the need for the construction personnel to separately ground the control module and the expansion module, greatly simplifying the grounding process and effectively reducing the grounding difficulty of the control assembly. This control assembly is applied to technical fields such as frequency converters and frequency conversion equipment. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is an exploded view of the control assembly in the embodiment provided by the present utility model;

[0023] Figure 2 It is a top view of the control assembly in the embodiment provided by the present utility model;

[0024] Figure 3 It is a side view of the control assembly in the embodiment provided by the present utility model;

[0025] Figure 4 It is a schematic structural diagram of the frequency converter in the embodiment provided by the present utility model.

[0026] Explanation of the Reference Numerals in the Drawings:

[0027] 100. Control component; 1. Housing; 11. Riveting post; 12. Mounting post; 13. First bending part; 14. Connecting part; 15. Second bending part; 2. Control module; 21. Bottom plate; 22. Power supply unit; 221. Heat conducting block; 23. Power supply terminal; 24. External terminal; 25. Fiber optic head; 26. Network cable terminal; 3. Expansion module; 31. Communication expansion card; 32. Pulse generator card; 33. Insulating sheet; 4. Grounding plate; 5. Light guide column;

[0028] 200. Outer shell; 210. Control cavity; 220. Accommodation cavity;

[0029] 300. Frequency conversion component.

[0030] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously.

[0034] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0035] The frequency converter is an advanced power control device and has been widely used in many fields due to its precise speed regulation ability and good energy-saving effect. The frequency converter mainly consists of a rectifier, a filter, an inverter, a braking component, a driving component, a detection component, and a control component. Among them, as an important part of the frequency converter, the control component is mainly responsible for receiving and processing various input signals to achieve precise control of the motor. However, during the actual use process, researchers found that when grounding the control component, it is necessary to ground the bottom plate and the expansion module of components such as the installation power supply and the wiring terminal respectively, and the construction personnel need to ground multiple components, which will increase the grounding difficulty of the control component.

[0036] The present utility model provides a frequency converter, aiming to solve the technical problem of the large grounding difficulty of the control component of the existing frequency converter.

[0037] Please refer to Figure 1 and Figure 4 , in an embodiment of the present utility model, the frequency converter includes a housing 200, a frequency conversion component 300, and a control component 100. The frequency conversion component 300 is disposed inside the housing 200; the control component 100 is disposed inside the housing 200 and is electrically connected to the frequency conversion component 300; the control component 100 includes a housing 1, a control module 2, an expansion module 3, and a grounding plate 4. The housing 1 is a sheet metal part and is disposed on the inner wall of the housing 200; the control module 2 is disposed on the inner side surface of the housing 1 and is located between the housing 1 and the inner wall of the housing 200. The expansion module 3 is disposed on the outer side surface of the housing 1, and the grounding plate 4 is disposed on the outer side surface of the housing 1, and both the control module 2 and the expansion module 3 are electrically connected to the grounding plate 4.

[0038] The technical solution of the present utility model simplifies the grounding process of the control assembly 100 and reduces the grounding difficulty thereof by providing a grounding plate 4 on the housing 1 and electrically connecting both the control module 2 and the expansion module 3 to the grounding plate 4. In this embodiment, the control assembly 100 is electrically connected to the variable frequency assembly 300 and is used to control the operation of the variable frequency assembly 300; the control module 2 is disposed on the inner side surface of the housing 1, that is, the housing 1 covers the control module 2, which can better protect the control module 2 to avoid damage. The grounding plate 4 is disposed on the outer side surface of the housing 1, which is convenient for construction workers to ground it. Electrically connecting the grounding points of both the control module 2 and the expansion module 3 to the grounding plate 4 can simplify the grounding process of the control assembly 100 and reduce the grounding difficulty thereof. Specifically, after the installation of the control assembly 100 is completed, the construction worker only needs to connect the external grounding wire to the grounding plate 4 to achieve the grounding of the control module 2 and the expansion module 3, without the need for the construction worker to separately ground the control module 2 and the expansion module 3, greatly simplifying the grounding process and effectively reducing the grounding difficulty of the control assembly 100. The control assembly 100 is applied to technical fields such as frequency converters and variable frequency devices.

[0039] It should be noted that in the related art, in order to ground the control assembly 100, construction workers usually need to operate in a relatively narrow space. However, for the control assembly 100 of the present utility model, by disposing the grounding plate 4 on the outer side of the housing 1, the situation where construction workers operate in a narrow space can be avoided, making the wiring more convenient and fast. At the same time, both the control module 2 and the expansion module 3 are electrically connected to the grounding plate, enabling the construction worker to ground only the grounding plate 4 to achieve the grounding of the control module 2 and the expansion module 3, which can simplify the grounding process and reduce the grounding difficulty. In a specific embodiment, at least one mounting hole for mounting a grounding bolt is provided on the grounding plate 4; during grounding, the construction worker first winds the external grounding wire around the grounding bolt, then installs the grounding bolt into the mounting hole, and presses the nut end of the grounding bolt against the grounding wire to achieve the grounding of the grounding plate 4, and further achieve the grounding of the control module 2 and the expansion module 3.

[0040] Please refer to Figure 1, in an embodiment of the present utility model, the housing 1 is provided with a press riveting post 11, and the control module 2 is arranged on the press riveting post 11 and is electrically connected to the grounding plate 4 through the press riveting post 11. In this embodiment, the control module 2 is installed on the housing 1 through the press riveting post 11 and is electrically connected to the grounding plate 4 through the press riveting post 11. Among them, the press riveting post 11 not only plays a role in supporting and fixing, but also plays a role in electrical signal connection, which can reduce the manufacturing difficulty and cost. Specifically, the grounding point of the control module 2 is conducted with the housing 1 through the press riveting post 11, and the housing 1 is conducted with the grounding plate 4, so that the conduction between the grounding point of the control module 2 and the grounding plate 4 can be realized. It should be noted that in order to ensure that the control module 2 can be conducted with the housing 1 through the press riveting post 11, when manufacturing the bottom plate 21 of the control module 2, an etching lead needs to be connected between the grounding point of the bottom plate 21 and the installation point for installing the press riveting post 11. In a specific embodiment, the housing 1 is a conductive part, and the housing 1 can be a metal plate made of conductive metals such as copper and aluminum.

[0041] In an embodiment of the present utility model, the number of the press riveting posts 11 is multiple, and the multiple press riveting posts 11 are evenly distributed on the housing 1. In this embodiment, the control module 2 is installed in the housing 1 through the multiple press riveting posts 11, which can ensure the reliability of the installation of the control module 2. Correspondingly, in order to simplify the structure of the bottom plate 21 of the control module 2 and reduce the manufacturing difficulty of the bottom plate 21 of the control module 2, when designing the bottom plate 21, only an etching lead needs to be connected between the grounding point of the bottom plate 21 and one of the installation points for installing the press riveting post 11. In a specific embodiment, the number of the press riveting posts 11 is four, the four press riveting posts 11 are arranged in a rectangle, and the four press riveting posts 11 correspond to the four corners of the bottom plate 21 of the control module 2 one by one.

[0042] Please refer to Figure 1, in an embodiment of the present utility model, the control module 2 includes a bottom plate 21 and a power supply unit 22 disposed on the bottom plate 21. The bottom plate 21 is disposed on the inner side surface of the housing 1, and a heat conducting block 221 is provided between the power supply unit 22 and the inner side surface of the housing 1. In this embodiment, the heat conducting block 221 is used to conduct heat. Specifically, when the control assembly 100 is in use, the heat generated by the power supply unit 22 can be conducted to the housing 1 through the heat conducting block 221, and the housing 1 is used for heat dissipation, which can improve the heat dissipation capacity of the control assembly 100 to reduce the temperature rise of the control assembly 100 during use. In a specific embodiment, the power supply unit 22 can be a power supply, etc., and the heat conducting block 221 can be a metal plate made of heat conducting metal materials such as copper and aluminum. The heat conducting block 221 is installed by means of adhesion; specifically, when installing the heat conducting block 221, first apply an adhesive material such as glue on two opposite end faces of the heat conducting block 221, then attach the heat conducting block 221 to the power supply unit 22, and finally install the bottom plate 21 of the control module 2 into the housing 1. At this time, the end face of the heat conducting block 221 facing away from the power supply unit 22 will be adhered to the inner side surface of the housing 1. In order to ensure the reliability of installing the heat conducting block 221 between the housing 1 and the power supply unit 22, after the bottom plate 21 of the control module 2 is installed, the position of the heat conducting block 221 can be pressed to make the two opposite end faces of the heat conducting block 221 firmly adhered to the inner side surface of the power supply unit 22 and the housing 1 respectively.

[0043] Please refer to Figure 1 and Figure 3 , in an embodiment of the present utility model, the control module 2 further includes a plurality of wiring terminals, and the plurality of wiring terminals are annularly arranged on the bottom plate 21 and all extend out of the housing 1. In this embodiment, the plurality of wiring terminals are annularly arranged and extend out of the housing 1, which is convenient for construction personnel to connect wires to reduce the wiring difficulty. In a specific embodiment, the plurality of wiring terminals are respectively a power supply terminal 23, an external connection terminal 24, an optical fiber head 25, etc. Among them, the power supply terminal 23 is used to connect an external power supply to supply power to the control module 2; the external connection terminal 24 is used to connect to an external device; the optical fiber head 25 is used to connect an external optical fiber cable to achieve signal transmission. In a specific embodiment, a network cable terminal 26 extending out of the housing 1 is further provided on the bottom plate 21.

[0044] Please refer to Figure 1, in an embodiment of the present utility model, the bottom plate 21 is provided with an indicator light, and the control component 100 further includes a light guide column 5 corresponding to the indicator light. The light guide column 5 is exposed to the housing 1. In this embodiment, the indicator light will present different light-emitting forms according to the working state of the control component 100, and the light guide column 5 has a good light guiding effect. By arranging the light guide column 5 corresponding to the indicator light and exposing it to the housing 1, the light emitted by the indicator light can be guided and emitted from the housing 1 for construction workers to observe. In a specific embodiment, the indicator lights are divided into two groups, one group includes three indicator lights arranged at intervals, and the other group includes two indicator lights arranged at intervals, and each indicator light is correspondingly provided with a light guide column 5.

[0045] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the expansion module 3 includes a communication expansion card 31 and a pulse generator card 32. The communication expansion card 31 and the pulse generator card 32 are arranged at intervals in the housing 1 and are both electrically connected to the grounding plate 4. In this embodiment, the communication expansion card 31 can provide an additional communication interface to allow the frequency converter to exchange data with external devices (such as PLC, upper computer, etc.) through different communication protocols. For example, an RS-485 communication expansion card can provide the function of remotely controlling the operation and parameter setting of the frequency converter through a serial port, enhancing the networking and remote control capabilities of the frequency converter. The pulse generator card 32, abbreviated as the PG card, is mainly used to receive encoder signals and convert them into signals suitable for processing by the control component. The pulse generator card 32 can realize functions such as level conversion, analog-to-digital conversion, optocoupler isolation, and shaping to ensure the accuracy and anti-interference of encoder signals. By using the communication expansion card 31 and the pulse generator card 32 in combination, the control component 100 of the present utility model can improve the flexibility and control accuracy of the frequency converter to meet the requirements of different industrial automation applications.

[0046] In an embodiment of the present utility model, mounting posts 12 are provided at positions of the housing 1 corresponding to the communication expansion card 31 and the pulse generator card 32. The communication expansion card 31 and the pulse generator card 32 are both disposed on the corresponding mounting posts 12 and are electrically connected to the ground plate 4 through the corresponding mounting posts 12. In this embodiment, the communication expansion card 31 and the pulse generator card 32 are both mounted on the housing 1 through the mounting posts 12 and are both electrically connected to the ground plate 4 through the mounting posts 12. Among them, the mounting posts 12 not only play a role in supporting and fixing, but also play a role in electrical signal connection, which can reduce the manufacturing difficulty and cost. Specifically, taking the communication expansion card 31 as an example for illustration, the grounding point of the communication expansion card 31 is conducted with the housing 1 through the mounting post 12, and the housing 1 is conducted with the ground plate 4. Thus, the conduction between the grounding point of the communication expansion card 31 and the ground plate 4 can be realized. It should be noted that in order to ensure that the communication expansion card 31 can be conducted with the housing 1 through the mounting post 12, when manufacturing the communication expansion card 31, an etching lead needs to be connected between the grounding point of its substrate and the mounting point for mounting the mounting post 12. In a specific embodiment, four mounting posts 12 are correspondingly provided for both the communication expansion card 31 and the pulse generator card 32, and the four mounting posts 12 are arranged in a rectangle, a parallelogram or a trapezoid.

[0047] Please refer to Figure 1, in an embodiment of the present utility model, the housing 1 includes a first bending portion 13, a connecting portion 14, and a second bending portion 15 that are sequentially connected. The first bending portion 13, the connecting portion 14, and the second bending portion 15 enclose to form a receiving cavity. The first bending portion 13 and the second bending portion 15 are both disposed on the inner wall of the outer housing 200. The control module 2 is disposed on one side of the connecting portion 14 facing the inner wall of the outer housing 200. An insulating sheet 33 is provided between the expansion module 3 and the side of the connecting portion 14 facing away from the inner wall of the outer housing 200. An insulating sheet 33 is provided between the expansion module 3 and the housing 1. Specifically, when the communication expansion card 31 and the pulse generator card 32 of the expansion module 3 are manufactured, there are exposed overlapping points (i.e., solder joints) on the end faces of the communication expansion card 31 and the pulse generator card 32 facing the housing 1. By providing the insulating sheet 33 between the expansion module 3 and the housing 1, the expansion module 3 and the housing 1 can be insulated to prevent the exposed overlapping points on the communication expansion card 31 and the pulse generator card 32 from conducting with the housing 1. In a specific embodiment, the insulating sheet 33 can be insulating paper. In this embodiment, the housing 1 has a receiving cavity formed by enclosing the first bending portion 13, the connecting portion 14, and the second bending portion 15. The control module 2 is completely received in the receiving cavity and is installed on one side of the connecting portion 14 facing the inner wall of the outer housing 200 through the riveting posts 11, which can better protect the control module 2 to prevent the control module 2 from being damaged during the installation process of the control assembly 100. In a specific embodiment, the housing 1 is U-shaped, and mounting plates are formed on the sides of the first bending portion and the second bending portion 15 away from the connecting portion 14. The height of the control module 2 is lower than the height of the mounting plates. When the control assembly 100 is installed on a plane, that is, when the mounting plates are installed on a plane, there is always a certain gap between the control module 2 and the plane, which can prevent the control module 2 from colliding with other structures during the installation process of the control assembly 100, thereby protecting the control module 2 and avoiding damage. Specifically, the housing 1 is designed to be U-shaped, the control module 2 is installed inside the housing 1, and the expansion module 3 is installed on the outer side of the housing 1, which has the characteristics of simple structure and can reduce the manufacturing difficulty. At the same time, multiple wiring terminals of the control module 2 can extend out of the housing 1, which can reduce the wiring difficulty.

[0048] Please refer to Figure 4, in an embodiment of the present utility model, the number of frequency conversion components 300 is two. The housing 200 is formed with a control cavity 210 and two accommodation cavities 220. The control module 2 is disposed in the control cavity 210, and the two frequency conversion components 300 are correspondingly disposed in the two accommodation cavities 220 and are both electrically connected to the control module 2. In this embodiment, by providing a plurality of frequency conversion components 300, the power of the frequency converter can be increased to meet the actual usage requirements of the frequency converter. And the control of the two frequency conversion components 300 by one control component 100 can reduce wiring and the manufacturing difficulty. Moreover, separating the control component 100, the two frequency conversion components 300 into three different chambers can reduce the heat conduction between the control component 100 and the two frequency conversion components 300 and ensure heat dissipation. In a specific embodiment, the two frequency conversion components 300 are both connected in parallel with the control component 100.

[0049] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A frequency converter, characterized in that, include: shell; A frequency conversion component, wherein the frequency conversion component is disposed in the housing; A control component is disposed in the housing and is electrically connected to the frequency conversion component; The control component includes a shell, a control module, an expansion module and a grounding plate. The shell is a sheet metal part and is arranged on the inner wall of the outer shell; the control module is arranged on the inner side surface of the shell and is located between the shell and the inner wall of the outer shell, and the expansion module is arranged on the outer side surface of the shell; the grounding plate is arranged on the outer side surface of the shell, and the control module and the expansion module are both electrically connected to the grounding plate.

2. The frequency converter according to claim 1, characterized in that, The housing is provided with a pressure riveting column, and the control module is arranged on the pressure riveting column and is electrically connected to the ground plate through the pressure riveting column.

3. The frequency converter according to claim 2, characterized in that, There are multiple pressure rivet columns, and the multiple pressure rivet columns are evenly distributed on the shell.

4. The frequency converter according to claim 1, wherein, The control module includes a base plate and a power supply unit arranged on the base plate. The base plate is arranged on the inner side surface of the shell. A heat conduction block is arranged between the power supply unit and the inner side surface of the shell.

5. The frequency converter according to claim 4, characterized in that The control module further includes a plurality of wiring terminals, which are arranged in a ring shape on the bottom plate and extend out of the housing.

6. The frequency converter according to claim 4, characterized in that The bottom plate is provided with an indicator light, and the control component further includes a light guide column provided corresponding to the indicator light, and the light guide column is exposed to the housing.

7. The frequency converter according to claim 1, characterized in that The expansion module includes a communication expansion card and a pulse generator card. The communication expansion card and the pulse generator card are arranged at intervals in the housing and are both electrically connected to the ground plate.

8. The frequency converter according to claim 7, characterized in that, The housing is provided with mounting posts at positions corresponding to the communication expansion card and the pulse generator card; the communication expansion card and the pulse generator card are arranged on the corresponding mounting posts and are electrically connected to the ground plate through the corresponding mounting posts.

9. The frequency converter according to any one of claims 1 to 8, characterized in that The shell includes a first bending portion, a connecting portion, and a second bending portion connected in sequence. The first bending portion, the connecting portion, and the second bending portion are arranged to form a accommodating cavity. The first bending portion and the second bending portion are both arranged on the inner wall of the shell. The control module is arranged on the side of the connecting portion facing the inner wall of the shell. An insulating sheet is arranged between the expansion module and the side of the connecting portion facing away from the inner wall of the shell.

10. The frequency converter according to any one of claims 1 to 8, characterized in that, There are two frequency conversion components. The shell is formed with a control cavity and two accommodating cavities. The control component is arranged in the control cavity. The two frequency conversion components are arranged in the two accommodating cavities in a one-to-one correspondence and are both connected to the control component by electrical signals.

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