Permanent magnet synchronous motor control box

Abstract

The utility model relates to the technical field of control boxes, in particular to a permanent magnet synchronous motor control box, which comprises a box body provided with a partition plate which divides the space in the box body into an installation cavity and a heat dissipation cavity; the power supply input interface is arranged on the box body and is used for being connected with a power supply; the frequency conversion control circuit is electrically connected with the power supply input interface and is used for controlling the permanent magnet synchronous motor to work; the power output interface is installed on the box body, electrically connected with the frequency conversion control circuit and used for being connected with a permanent magnet synchronous motor; the heat dissipation assembly is installed in the heat dissipation cavity and used for conducting heat dissipation on the frequency conversion control circuit. According to the utility model, the box body is divided into the mounting cavity and the heat dissipation cavity, and the frequency conversion control circuits are modularized and are respectively mounted in the corresponding cavities, so that the problem of poor heat dissipation effect in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of control boxes, in particular to a permanent magnet synchronous motor control box. BACKGROUND

[0002] The permanent magnet synchronous motor control box is a driving control device specially designed for a permanent magnet synchronous motor, and is usually composed of multiple parts, such as a power module, a voltage inverter, a controller, a radiator and the like, and also has input and output sockets or wiring terminals of the power supply. The main function is to control the operation of the permanent magnet synchronous motor. It can adjust and control the running parameters such as the speed, direction and torque of the motor to meet the needs of different application scenarios. The above structures are all installed in the inner cavity of the shell, and in order to meet the heat dissipation requirement, enough space (forming a heat dissipation channel) and a heat dissipation fan need to be reserved in the inner cavity of the shell, which leads to a large overall volume of the electric cabinet.

[0003] Subsequently, a kind of super-speed permanent magnet synchronous motor controller disclosed in Chinese patent 2023204749199 appears, mainly includes, including: box, power panel, main control board, drive board, busbar, capacitor, navigation plug, shielding plate and insulating seat, although the overall structure is small and exquisite, it is only applicable to small power permanent magnet motor.

[0004] And when this controller is used in the permanent magnet synchronous motor pump for emergency drainage operation, it requires small volume, light weight, and the smaller the better for use. Since the permanent magnet synchronous motor pump has large power, it will cause increased heat generation of the controller. However, due to the poor heat dissipation efficiency of this controller, the currently commonly used permanent magnet synchronous motor control box is heavy and bulky. SUMMARY

[0005] The purpose of the present technical solution is to provide a permanent magnet synchronous motor control box, which separates the box body into an installation cavity and a heat dissipation cavity by a new design of the box body and circuit, and modularizes the frequency conversion control circuit, so as to tightly arrange the power input interface and the power output interface with the box body, reduce the space occupation, reduce the overall volume and weight, and solve the problem of poor heat dissipation effect of the controller.

[0006] The purpose of the present technical solution is achieved as follows:

[0007] A permanent magnet synchronous motor control box comprises:

[0008] a box body, which is provided with a partition plate inside, and the partition plate separates the space in the box body into an installation cavity and a heat dissipation cavity;

[0009] a power input interface, which is mounted on the box body and used for connecting a power supply;

[0010] a frequency conversion control circuit, which is electrically connected with the power input interface and used for controlling the operation of a permanent magnet synchronous motor.

[0011] a power output interface mounted on the box and electrically connected with the variable frequency control circuit, for connecting the permanent magnet synchronous motor;

[0012] a heat dissipation assembly mounted in the heat dissipation cavity, for dissipating heat of the variable frequency control circuit;

[0013] a leakage protection module mounted on the box, for electrically connecting the rectification and filtering module and the power input interface, thereby protecting the variable frequency control circuit.

[0014] Preferably, the variable frequency control circuit has a power module located in the mounting cavity, which is close to or abuts against or penetrates through the partition plate;

[0015] The heat dissipation assembly comprises:

[0016] a fan mounted in the heat dissipation cavity and located at one side of the heat dissipation hole one; and

[0017] a heat dissipation plate having heat dissipation channels, which is fixed at the other side of the partition plate corresponding to the power module;

[0018] The heat dissipation cavity is provided with a heat dissipation hole one and a heat dissipation hole two at two ends thereof respectively;

[0019] The fan, the heat dissipation channels of the heat dissipation plate and the heat dissipation hole two constitute a heat dissipation passage.

[0020] Preferably, the variable frequency control circuit has:

[0021] a rectification and filtering module electrically connected with the power input interface and the power module;

[0022] The capacitor unit of the rectification and filtering module is at least partially located in the heat dissipation passage in the heat dissipation cavity.

[0023] Preferably, the capacitor unit comprises a capacitor plate and a plurality of capacitors located on the capacitor plate.

[0024] The partition plate is provided with a corresponding through hole, the capacitor plate is located in the mounting cavity, the capacitors penetrate through the through hole and enter the heat dissipation cavity, and sealing glue is arranged between the through hole and the capacitors.

[0025] Alternatively, the partition plate is provided with a wire hole, the capacitor plate and the plurality of capacitors are fixed in the heat dissipation cavity and electrically connected with the rectification and filtering module by penetrating through the wire hole of the partition plate through wires, and sealing glue is arranged between the wire hole and the wires.

[0026] Preferably, the heat dissipation plate comprises a fixed plate and a plurality of heat dissipation fins, the end face of the fixed plate is close to the partition plate, the fixed plate is provided with a fixed groove, the heat dissipation fins are sequentially inserted into the corresponding fixed grooves, and a heat dissipation flow channel is formed between the adjacent two heat dissipation fins, and the two ends of the heat dissipation flow channel are aligned with the heat dissipation hole one and the heat dissipation hole two respectively, thereby forming a linear heat dissipation channel.

[0027] Preferably, the box and the partition plate are integrally formed or separately formed,

[0028] The material of the box is metal or plastic.

[0029] The material of the partition plate is metal or plastic.

[0030] Preferably, the frequency conversion control circuit further comprises:

[0031] An operation display module is installed on the box and electrically connected with the control module, for displaying information and inputting instructions; and

[0032] A motor detection module is installed in the mounting cavity and electrically connected with the control module of the power module, for detecting the operating parameters of the permanent magnet synchronous motor.

[0033] Preferably, the control box further comprises:

[0034] A wireless control module is electrically connected with the control module, for receiving and sending wireless signals; and a remote operation module is used for remotely controlling the wireless control module, to realize remote automatic control.

[0035] Preferably, a PCB board and a shielding holder are arranged in the mounting cavity, the PCB board is arranged on the support column of the partition plate, the PCB board is provided with an isolation column, the shielding holder is installed on the isolation column through the isolation column, the shielding holder cooperates with the partition plate to form a shielding space, and the frequency conversion control circuit is distributed on the PCB board and / or the shielding holder.

[0036] The partition plate, the PCB board and the shielding holder are respectively provided with heat dissipation gaps.

[0037] Preferably, a plurality of partitions are arranged on the heat dissipation hole two, the partitions form an air inlet channel between the partitions, the cross section shape of the air inlet channel is at least one N-shaped flow channel or S-shaped flow channel, thereby forming a water blocking area, a separation area and a water collecting area in the air inlet channel.

[0038] A drainage hole is arranged on the partition at the bottom of the water collecting area, for draining water in the water collecting area.

[0039] The technical scheme has the following prominent and beneficial technical effects compared with the prior art:

[0040] 1. This technical solution involves a newly designed enclosure and circuitry. The enclosure is divided into a mounting cavity and a heat dissipation cavity. The frequency converter control circuit is then rearranged to fit within these cavities, reducing the spacing between components. The power input and output interfaces are tightly integrated with the enclosure, minimizing space requirements and resulting in a smaller overall size and weight. Modules that generate significant heat are centrally located and effectively cooled using the heat dissipation cavity. This design achieves both a reduced size and excellent heat dissipation and waterproofing, ensuring the stability and safety of the control box.

[0041] 2. In this technical solution design, the power module that generates a lot of heat is placed close to, against, or through the partition. The heat will be transferred to the partition. Since the heat sink is set on the other side of the partition corresponding to the power module, the fan is used to generate airflow. When the heat sink is used to dissipate heat, it also dissipates heat to the partition and the power module. Heat dissipation is achieved without affecting the sealing of the mounting cavity.

[0042] 3. In this technical solution, at least part of the capacitor unit of the rectifier and filter module is placed in the heat dissipation channel of the heat dissipation cavity. Therefore, the flowing air will carry away the heat on the capacitor unit and at the same time dissipate heat on the heat sink. Together with the heat dissipation channel, the heat dissipation effect can be maximized.

[0043] 4. The air intake plate in this technical solution has a unique air intake channel. From the perspective of cross-section, the cross-section shape is at least N-shaped or S-shaped, thus forming a water-blocking area, a separation area, and a water-collecting area within the air intake channel. The water-blocking area on the outside can block falling water from entering the interior. The water vapor mixed in the air will enter the air intake channel and, due to the curved shape of the channel, will collide with the separation area at high speed. The water vapor will be collected along the side wall into the water-collecting area due to the impact, and then discharged from the drain hole of the water-collecting area. This ensures that the air entering the heat dissipation cavity is dry, reduces the impact of water vapor on components, lowers the probability of short circuits, and ensures service life. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the control box in Embodiment 1 of the present invention.

[0045] Figure 2 This is a schematic diagram of the front of the control box in Embodiment 1 of the present invention.

[0046] Figure 3 for Figure 2 A cross-sectional view from the perspective of AA.

[0047] Figure 4 for Figure 2 A cross-sectional view from the perspective of a BB (Black and White) camera.

[0048] Figure 5 Structure diagram of the frame and the partition plate of the embodiment 1 of the present application.

[0049] Figure 6 Structure diagram of the frame and the partition plate of the embodiment 1 of the present application. Figure 4 Enlarged view of C of the frame and the partition plate of the embodiment 1 of the present application.

[0050] Figure 7 Structure diagram of the frame and the partition plate of the embodiment 1 of the present application.

[0051] Figure 8 Structure diagram of the frame and the partition plate of the embodiment 1 of the present application. Figure 7 Exploded view of the frame and the partition plate of the embodiment 1 of the present application.

[0052] Figure 9 Logic diagram of the control box of the embodiment 1 of the present application.

[0053] Figure 10 Structure diagram of the embodiment 2 of the present application.

[0054] Figure 11 Sectional view diagram of the embodiment 2 of the present application.

[0055] Figure 12 S-shaped air inlet passage diagram of the embodiment 2 of the present application.

[0056] Figure 13 N-shaped air inlet passage diagram of the embodiment 2 of the present application.

[0057] Figure 14 Structure diagram of the embodiment 6 of the present application.

[0058] The drawings show that: 1, the box; 2, the partition plate; 3, the mounting cavity; 4, the heat dissipation cavity; 5, the power input interface; 6, the frequency conversion control circuit; 7, the power output interface; 8, the heat dissipation assembly; 9, the power module; 10, the rectifier filter module; 11, the capacitor unit; 12, the first heat dissipation hole; 13, the second heat dissipation hole; 14, the leakage protection module; 15, the PCB board; 16, the shielding holder; 17, the support column; 18, the isolation column; 19, the heat dissipation gap; 20, the stepped abutting surface; 21, the through hole; 22, the through hole; 23, the fan; 24, the heat dissipation plate; 25, the partition; 26, the air inlet passage; 27, the water retaining area; 28, the separation area; 29, the water collecting area; 30, the fixing plate; 31, the heat dissipation fin; 32, the heat dissipation flow channel; 33, the control module; 34, the operation display module; 35, the motor detection module; 37, the roller; 38, the pull rod; 39, the handle. DETAILED DESCRIPTION

[0059] The specific embodiments of the present application will be further described in detail below with reference to the drawings.

[0060] Embodiment 1:

[0061] As Figures 1-5As shown, a kind of permanent magnet synchronous motor control box, mainly for controlling permanent magnet synchronous motor work, in this embodiment, mainly with the permanent magnet synchronous motor for pump as an example is developed, first permanent magnet synchronous motor control box mainly includes: box 1, for connecting power supply input interface 5 of mains / generator, for controlling the variable frequency control circuit 6 of permanent magnet synchronous motor work, for connecting the power output interface 7 of permanent magnet synchronous motor, for heat dissipation heat dissipation assembly 8 and for protecting the leakage protection module 14 of variable frequency control circuit 6;Power supply input interface 5, power output interface 7 and leakage protection module 14 are all installed on the box 1, and variable frequency control circuit 6 and heat dissipation assembly 8 are all installed in the box 1.

[0062] Wherein, the box 1 mainly includes hollow frame, the upper end of the frame is hinged with a handle 39, the lower end is protruded to form a support foot, the frame is provided with an opening, the opening is provided with a door plate 40 for sealing, the door plate 40 can be hinged or fixed by screws, the inside of the frame is provided with a partition plate 2, the inside space of the frame is divided into mounting cavity 3 and heat dissipation cavity 4, heat dissipation hole two 13 and heat dissipation hole one 12 are respectively arranged on the left and right side walls of the frame corresponding to the heat dissipation cavity 4, and the heat dissipation hole two 13 and the heat dissipation hole one 12 are mainly connected the heat dissipation cavity 4 with the outside.

[0063] As shown in Figure 3 and Figure 4 The heat dissipation assembly 8 is installed in the heat dissipation cavity 4, and the variable frequency control circuit 6 is mostly installed on the side of the partition plate 2 in the mounting cavity, the mounting cavity 3 has waterproof function to ensure that the variable frequency control circuit 6 will not be short-circuited due to water ingress. Air flows through the heat dissipation assembly 8, thereby taking away the heat conducted to the partition plate by the variable frequency control circuit 6, so as to achieve heat dissipation.

[0064] The technical scheme designs to redesign the box and circuit, divides the box into mounting cavity and heat dissipation cavity, and re-arranges the variable frequency control circuit in cooperation with the mounting cavity and heat dissipation cavity of the box, reduces the layout gap, concentrates the layout of the modules with serious heat generation, and performs key heat dissipation by using the heat dissipation cavity, so as to ensure that the volume is reduced, and good heat dissipation effect is considered, and the stability and safety of the control box are ensured.

[0065] For example, when the permanent magnet synchronous motor pump is used for emergency drainage operation, in order to obtain convenient use and play the maximum flood prevention effect, it is required that the volume and weight of the electric control box of the permanent magnet pump control equipment are smaller, and the technical scheme is to make the devices in the control box into an integrated whole, make the variable frequency control circuit 6, power supply input interface 5 and power output interface 7 into an integrated whole, compress the space, and make the volume and weight minimum.

[0066] Combined Figure 1In the embodiment, the heat dissipation holes two 13 and the heat dissipation holes one 12 are arranged on the left and right sides, the power input interface 5 and the power output interface 7 are arranged on the lower front side of the box body, in actual use, the box body can be used vertically through the supporting feet, and the falling water cannot enter from the left and right heat dissipation holes two 13 and the heat dissipation holes one 12.

[0067] The above-mentioned partition plate can be integrally formed with the frame body or separately arranged, and the separate arrangement can be fixed by screws, welded or inserted to realize the connection of the partition plate 2 and the frame body. Figure 5 and Figure 6 In the technical solution, the partition plate is separately arranged, that is, a convex edge 41 is protruded on the inner wall of the frame body, a sealing groove 42 is recessed on the upper end surface of the convex edge, a sealing ring is arranged in the sealing groove, then the edge of the partition plate is overlapped on the convex edge, a connecting column 43 is further protruded on the inner wall of the frame body, a threaded hole is arranged on the upper end of the connecting column, the partition plate is fixed by the cooperation of the screw and the threaded hole, and the installation and fixation of the partition plate in the frame body are completed, and the sealing ring can realize the sealing effect.

[0068] The insertion mode can be that an insertion slot is arranged in the frame body, then the partition plate 2 is inserted into the insertion slot, and then the side plate is fixed to realize the installation and fixation. Or a convex strip is protruded in the box body 1, then the partition plate 2 is placed in the box body 1, the edge of the partition plate 2 is overlapped on the convex strip, and then the partition plate 2 can be fixed by screws or the like, and a sealing ring can be arranged between the convex strip and the edge of the partition plate 2 to realize the sealing effect.

[0069] The heat dissipation assembly 8 mainly comprises a fan 23 and a heat dissipation plate 24.

[0070] As shown in the figure, Figure 3 In the technical solution, two fixed edges 44 are arranged side by side in the heat dissipation cavity 4, the fixed edges are located on one side of the heat dissipation holes one 12, then the fan 23 is arranged between the fixed edges, the fan 23 is fixed by the cooperation of the fixed edges and the partition plate, a through hole 46 is arranged on the partition plate to realize the electrical connection of the fan and the frequency conversion control circuit 6, the gap between the through hole 46 and the wire is sealed by sealing glue, the heat dissipation plate 24 is fixed on the other side of the power module 9 of the frequency conversion control circuit through the screw mode, an avoiding hole 45 is arranged on the partition plate, part of the power module 9 can be arranged in the avoiding hole 45, and the power module 9 can be directly attached to the end surface of the heat dissipation plate 24.

[0071] Due to the fixation of the screw, the end surface of the heat dissipation plate 24 is tightly attached to the end surface of the partition plate 2, the gap between the avoiding hole 45 and the power module 9 is not filled with water, and the sealing effect of the installation cavity is ensured.

[0072] The heat dissipation plate 24 comprises a fixed plate 30 and a plurality of heat dissipation fins 31; the heat dissipation fins 31 and the fixed plate 30 can be integrally formed or separately arranged; the separately arranged heat dissipation fins 31 can be inserted into corresponding fixed grooves arranged side by side on the fixed plate 30, and the heat dissipation flow channels 32 are formed between the inserted heat dissipation fins 31. Such design is convenient for processing and can minimize the spacing between the heat dissipation fins 31, so that thinner heat dissipation fins 31 with more quantity can be used, thereby improving the heat dissipation effect of the heat dissipation plate 24.

[0073] In this way, the fan 23, the heat dissipation flow channels 32 and the heat dissipation holes 113 of the heat dissipation plate 24 form a heat dissipation channel, so that the heat dissipation of the frequency conversion control circuit through the partition plate can be realized.

[0074] Another scheme is to arrange the power module with high heat generation close to or in contact with the partition plate, and the heat is transferred to the partition plate; since the heat dissipation plate is arranged on the other side of the corresponding partition plate of the power module, the fan is used to generate air flow to dissipate heat from the heat dissipation plate, and the partition plate and the power module are simultaneously cooled, without affecting the sealing of the mounting cavity.

[0075] The fixed plate 30 is in close contact with the partition plate 2, and the fixed plate 30 is fixed by screws or adhesion, and the two ends of the heat dissipation flow channels 32 are aligned with the heat dissipation holes 112 and 113 respectively, so as to form a linear heat dissipation channel.

[0076] The fan can blow air towards the heat dissipation cavity or blow air out of the heat dissipation cavity to form air flow; in the embodiment, the fan blows air out of the heat dissipation cavity 4, the air enters the heat dissipation cavity 4 from the heat dissipation holes 113, passes through the heat dissipation plate 24, and is directly discharged from the heat dissipation holes 112, so that the air flow time in the heat dissipation cavity 4 is short, thereby ensuring the heat dissipation effect.

[0077] As shown in Figure 5 The mounting cavity 3 of the box body 1 mainly comprises two parts, one part is a chamber one corresponding to the end face of the partition plate for accommodating the frequency conversion control circuit 6, and the other part is a chamber two for accommodating wires and facilitating wiring, the two chambers are in communication with each other, the chamber one and the chamber two each have an opening, the opening of the chamber two is provided with a cover plate to realize sealing and closure; the opening of the chamber one is hingedly connected with a door plate, and a sealing ring is arranged between the door plate and the opening to realize sealing.

[0078] Further, as shown in Figures 7-9As shown, the variable frequency control circuit 6 includes a rectification filter module 10 for converting current, a power module 9 for controlling the permanent magnet synchronous motor, a control module 33, a motor detection module 35 for detecting the operating parameters of the permanent magnet synchronous motor, and an operation display module 34 for displaying information and inputting instructions, which mainly includes a display screen for displaying data parameters, a start-stop button for controlling start and stop, an indicator light for starting and stopping, a speed regulating knob, and the like.

[0079] Reference Figure 9 In the embodiment, the power input interface 5 is electrically connected to the rectification filter module 10 through the leakage protection module 14, the rectification filter module 10 provides stable control current for the power module 9 and the control module 33, the motor detection module 35 detects the operating parameters of the driving permanent magnet synchronous motor in real time and feeds back to the control module 33, and the control module 33 drives the permanent magnet synchronous motor to work normally through the power module 9.

[0080] As shown in Figure 7 and Figure 8 In order to install and fix the variable frequency control circuit 6, a plurality of support columns 17 are protrudingly arranged on the partition plate, a PCB board 15 is fixed on the support columns 17, an isolation column 18 is installed on the PCB board 15, and a shielding holder 16 is fixed on the isolation column 18 through screws. After installation, the shielding holder 16 cooperates with the partition plate 2 to form a shielding space, the modules susceptible to interference, such as the control module 33, are arranged outside the shielding plate, and other modules are placed in the shielding space, so that the problem of module interference is solved, thereby ensuring the stability of work.

[0081] The variable frequency control circuit 6 is distributed on the PCB board 15 and / or the shielding holder 16.

[0082] The partition plate 2 and the PCB board 15 are left with a heat dissipation gap 19, and the PCB board 15 and the shielding holder 16 are also left with a heat dissipation gap 19.

[0083] Meanwhile, a stepped abutting surface 20 is arranged on the shielding plate, and a through hole 21 is arranged beside the stepped abutting surface 20. When the end of the wiring row of the rectification filter module 10 passes through the through hole 21, the rear end of the wiring row abuts against the stepped abutting surface 20. After such design, the wiring row can be supported during wiring, the connection strength requirement between the wiring row and the PCB board 15 is reduced, and the problem that the module is damaged due to additional force generated during wiring is avoided.

[0084] At the same time, since the power module 9 has an IGBT unit, which is the main heat source, in order to ensure heat dissipation of the IGBT unit, the IGBT unit is arranged on the back of the PCB 15, and then the IGBT unit is arranged in the avoiding hole 45 of the partition plate 2, so that the IGBT unit directly contacts the heat dissipation plate, and the heat-conducting silica gel for heat conduction is coated between the two, so that the heat dissipation problem of the IGBT unit is solved.

[0085] As shown in Figure 3 and Figure 7 , in order to further ensure the heat dissipation effect of the frequency conversion control circuit 6, the capacitor unit 11 of the rectification and filtering module 10 is at least partially located in the heat dissipation channel of the heat dissipation cavity 4. That is, a plurality of through holes 22 are formed in the partition plate 2, the number of through holes is the same as the number of capacitors of the capacitor unit 11 of the frequency conversion control circuit 6, and six capacitors are taken as an example in the embodiment. During installation, the capacitor is passed through the corresponding through hole 22 and arranged in the heat dissipation cavity 4, and then the gap between the through hole 22 and the capacitor is sealed with sealing glue. After such design, the air in the heat dissipation cavity directly cools the capacitor, and the overall heat dissipation is realized in cooperation with the heat dissipation plate.

[0086] In the embodiment, the capacitor is installed at a position close to the heat dissipation hole two of the heat dissipation cavity, so that the air first passes through the capacitor unit and then passes through the heat dissipation plate 24 and is discharged from the heat dissipation hole one.

[0087] If the air first passes through the heat dissipation plate 24 and then passes through the capacitor, the heat dissipation effect of the capacitor will be affected, which may cause problems in the circuit and affect the stability. Therefore, the air entering the heat dissipation cavity is preferentially cooled to the capacitor and then to the heat dissipation plate.

[0088] Referring to Figure 4 and Figure 5 , in order to facilitate installation of the heat dissipation assembly, the partition plate is divided into two parts, the heat dissipation plate is fixed on the partition plate, and then the partition plate is fixed. After installation, the lower end of the heat dissipation fin 31 abuts against the inner wall of the bottom of the heat dissipation cavity, which ensures the tightness between the fixed plate 30 and the partition plate 2, supports the partition plate 2, reduces deformation, ensures the heat transfer effect, and ensures that the air completely passes through the heat dissipation fin, improves the utilization of air, and ensures the heat dissipation effect.

[0089] In order to further ensure the heat dissipation effect, the box body and the partition plate can be made of metal, preferably aluminum and its alloy.

[0090] The two can be produced by integral molding.

[0091] Embodiment 2:

[0092] The structure of the embodiment is basically the same as that of the embodiment 1, and the structure of the box body is slightly different, which is as follows.

[0093] In combination Figure 10 and Figure 11 In this embodiment, the box also includes a frame and a partition, the partition is arranged in the frame to form an installation cavity 3 and a heat dissipation cavity 4, the installation cavity 3 is not divided into two chambers, but only one chamber, the frequency conversion control circuit 6 is installed in the installation cavity 3, and the second heat dissipation hole 13 and the first heat dissipation hole 12 are respectively arranged at the two ends in the length direction of the box, the partition is not provided with a clearance hole, so that the power module 9 directly abuts against the partition, and the heat transfer is realized by using the thermal conductivity of the material to realize heat dissipation.

[0094] The ports of the wiring of the power input interface 5 and the power output interface 7 are downward, and are horizontally placed on the ground surface during use, and air suction and heat dissipation are performed horizontally.

[0095] Or the ports of the wiring of the power input interface 5 and the power output interface 7 are forward, so that the same direction as the display screen is realized, so that the wiring can be used vertically.

[0096] In combination Figure 10 and Figure 11 The box 1 is also provided with a roller 37 and a pull rod 38, and the cooperation of the pull rod 38 and the roller 37 facilitates the movement of the box 1 as a whole.

[0097] The pull rod 38 is fixed on the second cover plate.

[0098] The pull rod 38 is protrudingly arranged on the box 1, so that after the box 1 is placed on the ground, a gap is left between the box 1 and the ground under the action of the pull rod 38, so as to facilitate the air flow.

[0099] Embodiment 3:

[0100] The embodiment is basically the same as the other embodiments, and the difference lies in that a new partition 25 is arranged at the second heat dissipation hole 13, and the specific arrangement is as follows.

[0101] Since the use scene of the control box is not unique, the capacitor unit is arranged in the heat dissipation cavity 4, so the heat dissipation cavity 4 also needs to have a certain waterproof ability.

[0102] As Figure 12 and Figure 13 shown, a plurality of partitions 25 are arranged at the second heat dissipation hole 13, the partitions 25 can be integrally or separately arranged at the second heat dissipation hole 13, the partitions 25 form an air inlet channel 26 between the partitions 25, the air inlet channel 26 is at least one N-shaped or S-shaped in cross-sectional shape, so as to form a water blocking area 27, a separation area 28 and a water collecting area 29 in the air inlet channel 26, a drain hole is arranged on the partition 25 at the bottom of the water collecting area 29, and is used for draining water in the water collecting area 29.

[0103] The spacer 25 can be fixed by bolts or inserted.

[0104] The air inlet plate in the technical solution is formed with a unique air inlet channel. From the perspective of a cross section, the shape of the cross section is at least one N shape or S shape, so as to form a water blocking area 27, a separation area 28 and a water collecting area 29 in the air inlet channel. The opening of the water blocking area 27 is arranged in a direction, the separation area 28 is arranged upward and connected to the tail end of the water blocking area 27, and the water collecting area 29 is connected to the tail end of the separation area 28.

[0105] In this way, the water blocking area on the outer side can block the falling water, so that the water cannot easily enter the inside of the heat dissipation cavity. The water vapor mixed in the air can be separated by the water vapor hitting the surface of the separation area at a high speed due to the curved channel shape after entering the air inlet channel. The separated small water droplets are collected in the water collecting area along the side wall and then discharged from the drain hole of the water collecting area. In this way, the air entering the heat dissipation cavity can be dried, the influence of the water vapor on the components can be reduced, the probability of short circuit can be reduced, and the service life can be ensured.

[0106] In order to avoid the entry of sundries or living things into the heat dissipation cavity 4 during carrying or storage, a sealing plate can be arranged on the box body 1 to block the second heat dissipation hole 13 and the first heat dissipation hole 12, so as to reduce the entry of foreign matters.

[0107] Embodiment 4:

[0108] The structure of the embodiment is basically the same as that of the other embodiments, and the difference lies in the installation position of the capacitor unit. Specifically, a wire hole is formed in the partition plate 2, the capacitor unit includes a capacitor plate and a plurality of capacitors, the capacitor plate and the plurality of capacitors are fixed in the heat dissipation cavity 4, and the capacitor plate and the plurality of capacitors are connected to the rest of the rectifier and filter module 10 through wires passing through the wire hole of the partition plate 2. A sealing glue is arranged between the wire hole and the wire.

[0109] Embodiment 5:

[0110] The structure of the embodiment is basically the same as that of the other embodiments, and the difference lies in that the materials of the box body and the partition plate can be different. Different materials can be selected according to different power.

[0111] For example, when the power is small, the same can be made of plastic, and the partition plate can be made of plastic or metal.

[0112] When the power is large, a full-metal design can be adopted to realize heat dissipation by the whole.

[0113] The specific selection can be made according to the actual situation.

[0114] Embodiment 6:

[0115] AsFigure 14 As shown, in order to improve the convenience of control, a wireless control module and a remote operation module can also be added, the wireless control module is electrically connected with the control module, for receiving and sending wireless signals, the remote operation module can be a mobile phone end, for remotely controlling the wireless control module, to realize remote automatic control.

[0116] Embodiment 7:

[0117] The structure of this embodiment is basically the same as that of other embodiments, the difference is that the partition plate 2 is not sealed, that is, the installation cavity 3 and the heat dissipation cavity 4 are communicated with each other.

[0118] The scheme of this embodiment is mainly suitable for use in low-power or dry environment.

[0119] The basic principle and main features of the technical scheme and the advantages of the technical scheme are shown and described above. It should be understood by those skilled in the art that the technical scheme is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the technical scheme. Without departing from the spirit and scope of the technical scheme, various changes and improvements of the technical scheme can be made, and these changes and improvements all fall within the scope of the claimed technical scheme. The scope of protection of the technical scheme is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet synchronous motor control box, characterized by, The application relates to a permanent magnet synchronous motor control box. The box body (1) is internally provided with a partition plate (2) which divides the space in the box body into a heat dissipation cavity (4) and a mounting cavity (3); A power input interface (5) is mounted on the box body (1) and used for connecting a power supply; A variable frequency control circuit (6) is electrically connected with the power input interface (5) and used for controlling the operation of a permanent magnet synchronous motor; A power output interface (7) is mounted on the box body (1) and electrically connected with the variable frequency control circuit (6) and used for connecting the permanent magnet synchronous motor; and A heat dissipation assembly (8) is mounted in the heat dissipation cavity (4) and used for dissipating heat of the variable frequency control circuit (6).

2. The permanent magnet synchronous motor control box according to claim 1, wherein the variable frequency control circuit (6) has a power module (9) located in the mounting cavity (3) and close to or abutting or penetrating the partition plate (2) through an end face; The heat dissipation assembly (8) comprises: A fan (23) is mounted in the heat dissipation cavity (4) and located on one side of the heat dissipation hole (12); and A heat dissipation plate (24) has a heat dissipation flow channel (32) and is fixed on the other side of the partition plate (2) corresponding to the power module (9); Heat dissipation holes (12) and (13) are respectively arranged at two ends of the heat dissipation cavity (4); The fan (23), the heat dissipation flow channel (32) of the heat dissipation plate (24) and the heat dissipation hole (13) form a heat dissipation channel.

3. The permanent magnet synchronous motor control box according to claim 2, wherein the variable frequency control circuit (6) has: A rectification and filtering module (10) is electrically connected with the power input interface (5) and the power module (9); At least part of a capacitor unit (11) of the rectification and filtering module (10) is located in the heat dissipation channel of the heat dissipation cavity (4).

4. The permanent magnet synchronous motor control box according to claim 3, wherein the capacitor unit (11) comprises a capacitor plate and a plurality of capacitors located on the capacitor plate; Corresponding through holes (22) are arranged on the partition plate (2), the capacitor plate is located in the mounting cavity (3), the capacitors pass through the through holes (22) and enter the heat dissipation cavity (4), and sealing glue is arranged between the through holes (22) and the capacitors; Alternatively, wire holes are arranged on the partition plate (2), the capacitor plate and the plurality of capacitors are fixed in the heat dissipation cavity (4) and pass through the wire holes of the partition plate (2) through wires, so as to be electrically connected with the rectification and filtering module (10), and sealing glue is arranged between the wire holes and the wires.

5. The permanent magnet synchronous motor control box according to claim 4, wherein the heat dissipation plate (24) comprises a fixed plate (30) and a plurality of heat dissipation fins (31), the fixed plate (30) abuts the partition plate (2) through an end face, the fixed plate (30) is provided with fixed grooves, the heat dissipation fins (31) are sequentially inserted into the corresponding fixed grooves, heat dissipation flow channels (32) are formed between adjacent two heat dissipation fins, and the two ends of the heat dissipation flow channels (32) are respectively aligned with the heat dissipation holes (12) and (13), so as to form a linear heat dissipation channel. ​ ​ ​ ​ 6. The permanent magnet synchronous motor control box according to claim 2, characterized in that: the box body (1) and the partition plate (2) are integrally formed or separately formed, the material of the box body (1) is metal or plastic; the material of the partition plate (2) is metal or plastic.

7. The PMSM control box of claim 2, wherein, the frequency conversion control circuit (6) further comprises: an operation display module (34) mounted on the box body (1) and electrically connected with the control module of the power module (9) for displaying information and inputting instructions; and a motor detection module (35) mounted in the mounting cavity (3) and electrically connected with the control module of the power module (9) for detecting the operating parameters of the permanent magnet synchronous motor; a leakage protection module (14) mounted on the box body (1) for electrically connecting the rectification and filtering module (10) and the power input interface (5) to protect the frequency conversion control circuit (6).

8. The permanent magnet synchronous motor control box according to claim 1, characterized in that: the control box further comprises: a wireless control module electrically connected with the control module for receiving and sending wireless signals; and a remote operation module for remotely controlling the wireless control module to realize remote automatic control.

9. The permanent magnet synchronous motor control box according to claim 2, characterized in that: the mounting cavity (3) is provided with a PCB board (15) and a shielding holder (16), the PCB board (15) is arranged on the support column (17) of the partition plate (2), the PCB board (15) is provided with an isolation column (18), the shielding holder (16) is mounted on the PCB board (15) through the isolation column (18), the shielding holder (16) cooperates with the partition plate (2) to form a shielding space, and the frequency conversion control circuit (6) is distributed on the PCB board (15) and / or the shielding holder (16); heat dissipation gaps (19) are respectively left between the partition plate (2), the PCB board (15) and the shielding holder (16).

10. The permanent magnet synchronous motor control box according to claim 2, characterized in that: a plurality of partitions (25) are arranged on the second heat dissipation hole (13), the partitions (25) and the partitions (25) form air inlet channels (26) therebetween, the air inlet channels (26) have at least one N-shaped flow channel or S-shaped flow channel in cross section, so as to form a water blocking area (27), a separation area (28) and a water collecting area (29) in the air inlet channels (26); a drainage hole is formed in the partition (25) at the bottom of the water collecting area (29) for draining water in the water collecting area (29).

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