A modularly designed frequency converter

Abstract

The utility model discloses a modularization design's frequency converter relates to frequency converter technical field, including bottom shell, one side fixedly connected with middle shell of bottom shell, be equipped with heat dissipation subassembly in the passageway formed by middle shell and bottom shell, be equipped with middle shell clamping seat on the middle shell, be equipped with control module in the middle shell, be equipped with the pinout of cooperation with middle shell clamping seat on control module, pinout and middle shell clamping seat electric connection, pinout plug -in in middle shell clamping seat realizes the fixation of control module and middle shell, one side of bottom shell is equipped with drive module, the pinout of middle shell clamping seat adopts and drive module electric connection, be equipped with keyboard module on control module, the utility model discloses keyboard module, control module, extension module, drive module all adopt modularization design, can shorten development cycle, realize fault isolation, easy maintenance.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically a modular frequency converter design. Background Technology

[0002] As a core device in the field of electric drive, the frequency converter's standard structure comprises four core components: a human-machine interface panel (keyboard, LCD screen, etc.), a control unit, a rectifier unit, and an inverter unit. These functional units are assembled within the frequency converter housing. While this integrated design results in a compact structure, it presents two potential risks: First, electromagnetic interference can easily couple to adjacent circuits, causing signal distortion. Second, a faulty module may further damage other units, exacerbating the fault. Furthermore, replacing a faulty module involves cumbersome disassembly procedures, reducing work efficiency.

[0003] In terms of extended functionality, the inverter expansion box, as a key peripheral component, integrates enhanced functions such as motor rotor position detection and industrial bus communication, effectively meeting the needs of diverse application scenarios. Traditional expansion cards use a stacked installation scheme, which limits hardware compatibility. The control motherboard is only configured with fixed interfaces at specific intervals, making it impossible to adapt to expansion modules of different specifications. Secondly, the installation process is complex, requiring the complete installation process to sequentially perform steps such as disassembling the operation panel, removing the top cover, calibrating the positioning holes, and installing the fastening screws. To address these issues, we provide a modular inverter design. Utility Model Content

[0004] The purpose of this invention is to provide a modularly designed frequency converter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A modular inverter includes a base housing, a middle housing fixedly connected to one side of the base housing, a heat dissipation assembly within a channel formed by the middle housing and the base housing, a middle housing socket at the upper end of the middle housing, a control module within the middle housing, a pin header at the upper end of the control module that mates with the middle housing socket, the pin header being electrically connected to the middle housing socket, and the pin header being inserted into the middle housing socket to fix the control module to the middle housing, a drive module on one side of the base housing, the middle housing socket being electrically connected to the drive module via a ribbon cable, a keyboard module on the control module, a network cable connector electrically connected to the control module socket, a three-phase power input terminal, a DC bus terminal, and an inverter output terminal at the lower end of the middle housing, an expansion module on one side of the base housing, a connection assembly between the expansion module and the drive module, an expansion module busbar on one side of the expansion module, and a connection guide groove on one side of the control module, the connection guide groove being electrically connected to the expansion module busbar.

[0007] As a further embodiment of this utility model: the middle shell is provided with a cover plate located below the keyboard module. The cover plate is used to cover the three-phase power input terminals, DC bus terminals and inverter output terminals. The two sides of the middle shell are provided with snap-fit ​​seats for fixing the cover plate.

[0008] As a further improvement of this utility model: the upper and lower ends of the bottom shell away from the middle shell are fixedly connected with protruding edges, and mounting holes are provided on both sides of the protruding edges.

[0009] As a further embodiment of this utility model: the heat dissipation component includes a heat dissipation fan, which is installed in the channel formed by the bottom shell and the middle shell. A ventilation cover is installed at the upper end of the channel formed by the bottom shell and the middle shell, and a grid plate is installed at the lower end of the channel formed by the bottom shell and the middle shell. A grounding terminal is fixedly connected to the grid plate.

[0010] As a further improvement of this utility model: the keyboard module is provided with a buckle on the side near the control module, and the control module is provided with a buckle seat that matches the buckle of the keyboard module.

[0011] As a further improvement of this utility model, an identification plate is provided at the upper end of the cover plate.

[0012] As a further improvement of this utility model: the connecting component includes a bottom shell slot, which is located on the outer shell of the drive module, and the expansion module has an elastic buckle that cooperates with the bottom shell slot on the side near the drive module.

[0013] As a further embodiment of this utility model: the expansion module includes an adapter card, an encoder card, and a communication card. The encoder card has a pluggable terminal block on one side for electrically connecting to a motor encoder. The encoder card has a third busbar at one end, and the adapter card has a fourth busbar. The fourth busbar and the third busbar are electrically connected by a ribbon cable. The encoder card has a second communication interface on the side near the edge of the expansion module housing, and an antenna is electrically connected to the second communication interface. The communication card has a first busbar, and the first busbar and the third busbar are electrically connected by a ribbon cable. The encoder card and the communication card are arranged side by side. The communication card has a first communication interface, which extends to the edge of the expansion module through a slot on the side of the expansion module housing.

[0014] As a further improvement of this utility model, the adapter card, encoder card and communication card are respectively fixed inside the expansion module housing with screws.

[0015] As a further improvement of this utility model: a first exhaust port is provided at the lower end of one side of the bottom shell, and a second exhaust port is provided at the lower end of the other side of the bottom shell.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The keyboard module, control module, expansion module and driver module of this utility model are all modularly designed, which can shorten the development cycle, achieve fault isolation and facilitate maintenance.

[0018] 2. The expansion module of this utility model can flexibly combine encoder cards and communication cards, supports customized function expansion, and can be installed on the side of the frequency converter by snap-fit ​​without removing the top cover, making installation convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the main structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the left-side structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the bottom structure of this utility model.

[0024] Figure 6 This is a schematic diagram of the internal structure of the expansion module in this utility model.

[0025] The components are as follows: 1. Keyboard module; 2. Control module; 3. Drive module; 4. Expansion module; 5. Bottom shell; 6. Cover plate; 7. Cooling fan; 8. Ventilation chamber cover; 9. Connecting guide groove; 10. Expansion module busbar; 11. Wiring terminal; 12. Antenna; 13. Sign; 14. Control module slot; 15. Middle shell; 16. Middle shell slot; 17. Three-phase power input terminal; 18. DC bus terminal; 19. Inverter output terminal; 20. First exhaust port; 21. Bottom shell slot; 22. Mounting hole; 23. Grounding terminal; 24. Grille plate; 25. Adapter card; 26. Encoder card; 27. Communication card; 28. First busbar; 29. ​​Screw; 30. Third busbar; 31. First communication interface; 32. Elastic buckle; 33. Second exhaust port; 34. Fourth busbar; 35. Second communication interface. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1 and Figure 2 In this embodiment of the utility model, a modularly designed frequency converter includes a bottom shell 5. A middle shell 15 is fixedly connected to one side of the bottom shell 5. A protruding edge is fixedly connected to the upper and lower ends of the side of the bottom shell 5 away from the middle shell 15. Mounting holes 22 are provided on both sides of the protruding edge. The bottom shell 5 and the middle shell 15 constitute the core frame of the frequency converter, providing a stable installation reference for each modular component inside. The protruding edge not only enhances the structural strength of the bottom shell edge and avoids deformation due to stress during long-term use, but the mounting holes 22 on both sides can also be adapted to the guide rails or fixed brackets of standard cabinets. The frequency converter can be quickly positioned and fastened by bolts passing through the mounting holes, meeting various installation needs such as wall mounting and cabinet mounting in industrial scenarios.

[0028] Please see Figure 2 , Figure 4 and Figure 5 A heat dissipation assembly is provided within the channel formed by the middle shell 15 and the bottom shell 5. The heat dissipation assembly includes a cooling fan 7, which is installed within the channel formed by the bottom shell 5 and the middle shell 15. A ventilation cover 8 is installed at the upper end of the channel formed by the bottom shell 5 and the middle shell 15, and a grille plate 24 is installed at the lower end of the channel formed by the bottom shell 5 and the middle shell 15. A grounding terminal 23 is fixedly connected to the grille plate 24. A first exhaust port 20 is opened at the lower end of one side of the bottom shell 5, and a second exhaust port 33 is opened at the lower end of the other side of the bottom shell 5. The cooling fan 7 is installed in the middle of the channel and quickly removes the heat transferred to the channel wall by the core heat-generating components such as the drive module 3 and the control module 2 through directional airflow, and then exhausts it from the channel, realizing the directional migration of heat. The grounding terminal 23 fixed on the grille plate 24 is connected to the equipment shell and the grounding system, which can quickly conduct away the static electricity and potential leakage current generated during the operation of the frequency converter, avoiding the accumulation of charge from interfering with the electronic modules or causing safety hazards.

[0029] Please see Figure 2The upper end of the middle shell 15 is provided with a middle shell retainer 16. A control module 2 is housed inside the middle shell 15. The upper end of the control module 2 is provided with pin headers that mate with the middle shell retainer 16. The pin headers are electrically connected to the middle shell retainer 16, and the pin headers are inserted into the middle shell retainer 16 to fix the control module 2 to the middle shell 15. A drive module 3 is provided on one side of the bottom shell 5. The middle shell retainer 16 is electrically connected to the drive module 3 via a ribbon cable. A keyboard module 1 is provided on the control module 2. The keyboard module 1 has a network cable connector that is electrically connected to the control module retainer 14. A latch is provided on the side of the keyboard module 1 near the control module 2. The control module 2 has a latch seat that matches the latch of the keyboard module 1. The socket 16 is the core interface for mechanically fixing the control module 2 to the overall frame and for signal interaction. It integrates a series of conductive contacts, which serve as the installation reference for the control module 2 and also act as a signal relay. As the central processing unit of the frequency converter, the control module 2 has a pin header designed at its upper end that forms a matching plug-in structure with the socket 16 in the middle shell. When the pin header is inserted into the socket, it not only achieves electrical connection between the control module and the middle shell through the tight contact between the pins and the contacts, ensuring the stable transmission of control commands, status feedback and other signals, but also achieves mechanical fixing through the physical engagement between the pin header and the socket. The module can be positioned without additional screws, which greatly simplifies the installation and disassembly process and reflects the convenience of modular design.

[0030] The keyboard module 1 mounted on the control module 2 is the core carrier of human-computer interaction, used for parameter setting, status monitoring and other functions. The network cable plug is inserted into the control module card slot 14, and high-speed transmission of key signals and display signals is achieved through multi-core wires to ensure the real-time performance of human-computer interaction.

[0031] Please see Figure 2The lower end of the middle shell 15 is provided with a three-phase power input terminal 17, a DC bus terminal 18, and a frequency converter output terminal 19. A cover plate 6 is provided below the keyboard module 1 on the middle shell 15. The cover plate 6 is used to cover the three-phase power input terminal 17, the DC bus terminal 18, and the frequency converter output terminal 19. The two sides of the middle shell 15 are distributed with snap-fit ​​seats for fixing the cover plate 6. A sign plate 13 is provided on the upper end of the cover plate 6. The three-phase power input terminal 17 is used to connect to external industrial three-phase AC power to provide raw power to the rectifier unit inside the frequency converter. The DC bus terminal 18 connects the rectifier unit and the inverter unit and undertakes the function of transmitting the rectified DC voltage. Through this terminal, DC side voltage monitoring, energy storage capacitor connection, or parallel connection of the DC bus of multiple frequency converters can be realized to improve the system power supply stability. The frequency converter output terminal 19 transmits the adjustable frequency and adjustable voltage AC power output by the inverter unit to the motor, ultimately realizing precise control of motor speed and torque. The three components are arranged in an orderly manner along the lower end of the middle shell 15, which shortens the length of the internal conductors and reduces line loss and electromagnetic interference. The cover plate 6 effectively prevents operators from accidentally contacting the terminal and causing electric shock accidents. At the same time, it blocks dust, oil, water vapor and other impurities in the workshop environment from entering the terminal connection, avoiding terminal oxidation, poor contact or short circuit faults caused by the accumulation of impurities, and indirectly improving the service life of the terminals and the reliability of electrical connections.

[0032] Please see Figure 2 and Figure 6 An expansion module 4 is also provided on one side of the bottom shell 5. A connection component is provided between the expansion module 4 and the drive module 3. The connection component includes a bottom shell slot 21, which is located on the outer shell of the drive module 3. An elastic buckle 32 that cooperates with the bottom shell slot 21 is provided on the side of the expansion module 4 near the drive module 3. The bottom shell slot 21 and the elastic buckle 32 not only realize the stable connection between the expansion module 4 and the drive module 3, but also enhance the modular advantages of the frequency converter in terms of operation and maintenance efficiency, operational reliability and functional compatibility, so as to meet the needs of industrial scenarios for on-demand expansion and rapid operation and maintenance of frequency converters.

[0033] Please see Figure 6The expansion module 4 has an expansion module busbar 10 on one side, and the control module 2 has a connecting guide groove 9 on one side, which is electrically connected to the expansion module busbar 10. The expansion module 4 includes an adapter card 25, an encoder card 26, and a communication card 27. The encoder card 26 has a pluggable terminal block 11 on one side, which is used to electrically connect to the motor encoder. The encoder card 26 has a third busbar 30 at one end, and the adapter card 25 has a fourth busbar 34. The fourth busbar 34 and the third busbar 30 are electrically connected by a ribbon cable. The encoder card 25... A second communication interface 35 is located on the side near the edge of the expansion module 4 housing. An antenna 12 is electrically connected to the second communication interface 35. The communication card 27 has a first busbar 28, which is electrically connected to a third busbar 30 via a ribbon cable. The encoder card 26 is arranged side by side with the communication card 27. The communication card 27 has a first communication interface 31, which extends to the edge of the expansion module 4 through a slot on the side of the expansion module 4 housing. The adapter card 25, encoder card 26, and communication card 27 are respectively fixed to the expansion module 4 with screws 29. Inside the housing of block 4; expansion module 4 serves as the core for expanding the inverter's functions. Its internal components use expansion module busbar 10 as the energy and signal hub, providing power and transmitting signals to adapter card 25, encoder card 26, and communication card 27. The connecting guide groove 9 on one side of control module 2 is electrically connected to expansion module busbar 10, forming directional heat dissipation to ensure stable operation of each card. Adapter card 25 is connected to the third busbar 30 of encoder card 26 via shielded cable through the fourth busbar 34 to achieve signal adaptation and coordination. Encoder card 26 is connected to the motor encoder via pluggable terminal block 11. The second communication interface 35 near the edge of the expansion module 4 housing and the internally electrically connected antenna 12 support wireless expansion; the communication card 27 is connected to the third busbar 30 of the encoder card 26 through the first busbar 28, and its first communication interface 31 extends to the edge through a slot on the side of the expansion module 4 housing for easy connection to an external bus; the adapter card 25, encoder card 26 and communication card 27 are all arranged side by side and fixed inside the expansion module 4 housing by screws 29, which saves space and makes it easy to disassemble and install individually. The whole module achieves the modular advantages of flexible combination of functions, stable signal transmission and convenient maintenance.

[0034] The working principle of this utility model is as follows: external industrial three-phase AC power is connected to the internal rectifier unit of the frequency converter through the three-phase power input terminal 17 at the lower end of the middle shell 15. After rectification, it is converted into DC power. The DC power is transmitted to the inverter unit through the DC bus terminal 18. At the same time, the DC bus terminal 18 can be connected to an external energy storage capacitor or realize the parallel connection of multiple frequency converters to improve the power supply stability and lay the foundation for subsequent power conversion.

[0035] The control module 2 is connected to the middle shell socket 16 via a plug-in pin header, achieving mechanical fixation and signal interaction with the overall frame. The middle shell socket 16 connects the control module to the drive module 3 via a ribbon cable, enabling the control module 2 to send control commands such as speed and torque to the drive module 3, while simultaneously receiving operating status signals from the drive module 3. The user interacts with the machine via the keyboard module 1, which is connected to the control module socket 14 via a network cable. The keyboard module 1 transmits parameter settings such as frequency, voltage, and start / stop commands to the control module 2. The control module 2 processes these signals, generates corresponding control signals, and simultaneously feeds back the inverter's operating data to the keyboard module 1 for real-time monitoring by the user.

[0036] After receiving the command from the control module 2, the drive module 3 drives the internal inverter unit to invert the DC power transmitted from the DC bus into AC power with adjustable frequency and adjustable voltage, and then transmits it to the controlled motor through the inverter output terminal 19 at the lower end of the middle shell 15, so as to achieve precise control of motor speed and torque and meet the power needs of different industrial scenarios.

[0037] During inverter operation, core components such as control module 2 and drive module 3 generate heat. At this time, the cooling fan 7 within the channel between the bottom shell 5 and the middle shell 15 activates, quickly removing the heat transferred from the channel walls through directional airflow. The hot air is discharged through the ventilation cover 8 at the upper end of the channel, while cool air is drawn in from the lower grille plate 24. Simultaneously, the connection guide 9 on the side of the expansion module 4 receives power through the expansion module busbar 10, providing directional cooling for the adapter card 25, encoder card 26, and communication card 27 inside the expansion module 4, ensuring that the temperature of all modules is controlled within safe thresholds. Furthermore, the grounding terminal 23 on the grille plate 24 is connected to the equipment casing and grounding system, quickly dissipating static electricity and leakage current to avoid interference or safety hazards. The cover plate 6 on the middle shell 15 covers the power supply and output terminals, preventing accidental electric shock and the intrusion of dust and oil, ensuring operational safety.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Although this specification describes embodiments, not every embodiment contains only one technical solution. This method of description is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A modularly designed frequency converter, comprising a base housing (5), characterized in that: A middle shell (15) is fixedly connected to one side of the bottom shell (5). A heat dissipation component is provided in the channel formed by the middle shell (15) and the bottom shell (5). A middle shell holder (16) is provided at the upper end of the middle shell (15). A control module (2) is provided inside the middle shell (15). A pin header that mates with the middle shell holder (16) is provided at the upper end of the control module (2). The pin header is electrically connected to the middle shell holder (16). The pin header is inserted into the middle shell holder (16) to fix the control module (2) to the middle shell (15). A drive module (3) is provided on one side of the bottom shell (5). The middle shell holder (16) is electrically connected to the drive module (3) by a ribbon cable. The control module (2) is provided with a keyboard module (1), and the keyboard module (1) is provided with a network cable plug that is electrically connected to the control module card slot (14). The lower end of the middle shell (15) is provided with a three-phase power input terminal (17), a DC bus terminal (18) and a frequency converter output terminal (19). The bottom shell (5) is also provided with an expansion module (4) on one side. A connection component is provided between the expansion module (4) and the drive module (3). An expansion module busbar (10) is provided on one side of the expansion module (4). A connection guide groove (9) is provided on one side of the control module (2). The connection guide groove (9) is electrically connected to the expansion module busbar (10).

2. The modularly designed frequency converter according to claim 1, characterized in that, The middle shell (15) is provided with a cover plate (6) located below the keyboard module (1). The cover plate (6) is used to cover the three-phase power input terminal (17), the DC bus terminal (18) and the inverter output terminal (19). The middle shell (15) has snap-fit ​​seats distributed on both sides for fixing the cover plate (6).

3. The modularly designed frequency converter according to claim 1, characterized in that, The bottom shell (5) has protruding edges fixedly connected to the upper and lower ends of the side away from the middle shell (15), and mounting holes (22) are provided on both sides of the protruding edges.

4. The modularly designed frequency converter according to claim 1, characterized in that, The heat dissipation assembly includes a cooling fan (7), which is installed in the channel formed by the bottom shell (5) and the middle shell (15). A ventilation cover (8) is installed at the upper end of the channel formed by the bottom shell (5) and the middle shell (15), and a grille plate (24) is installed at the lower end of the channel formed by the bottom shell (5) and the middle shell (15). A grounding terminal (23) is fixedly connected to the grille plate (24).

5. A modularly designed frequency converter according to claim 1, characterized in that, The keyboard module (1) has a buckle on the side near the control module (2), and the control module (2) has a buckle seat that matches the buckle of the keyboard module (1).

6. A modularly designed frequency converter according to claim 2, characterized in that, The cover plate (6) is provided with an identification plate (13) at its upper end.

7. A modularly designed frequency converter according to claim 1, characterized in that, The connecting component includes a bottom shell slot (21), which is located on the outer shell of the drive module (3). The expansion module (4) has an elastic buckle (32) that cooperates with the bottom shell slot (21) on the side near the drive module (3).

8. A modularly designed frequency converter according to claim 7, characterized in that, The expansion module (4) includes an adapter card (25), an encoder card (26), and a communication card (27). The encoder card (26) has a pluggable terminal block (11) on one side, which is used to electrically connect to the motor encoder. The encoder card (26) has a third busbar (30) at one end, and the adapter card (25) has a fourth busbar (34). The fourth busbar (34) and the third busbar (30) are electrically connected by a ribbon cable. The encoder card (26) is located near the edge of the expansion module (4) housing. A second communication interface (35) is provided on one side of the edge. An antenna (12) is electrically connected inside the second communication interface (35). A first busbar (28) is provided on the communication card (27). The first busbar (28) and the third busbar (30) are electrically connected by a ribbon cable. The encoder card (26) and the communication card (27) are arranged side by side. A first communication interface (31) is provided on the communication card (27). The first communication interface (31) extends to the edge of the expansion module (4) through a slot on the side of the expansion module (4) housing.

9. A modularly designed frequency converter according to claim 8, characterized in that, The adapter card (25), encoder card (26) and communication card (27) are fixed inside the housing of the expansion module (4) with screws (29).

10. A modularly designed frequency converter according to claim 4, characterized in that, A first exhaust port (20) is provided at the lower end of one side of the bottom shell (5), and a second exhaust port (33) is provided at the lower end of the other side of the bottom shell (5).

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