Permanent magnet synchronous motor control box

Abstract

The present invention relates to the technical field of control boxes, and in particular to a permanent magnet synchronous motor control box, comprising: a box body, which is provided with a partition, and the partition divides the space in the box body into a sealed cavity and a heat dissipation cavity; a power input interface, which is installed on the box body and used to connect the power supply; a frequency conversion control circuit, which is electrically connected to the power input interface, and used to control the operation of the permanent magnet synchronous motor; a power output interface, which is installed on the box body and electrically connected to the frequency conversion control circuit, and used to connect the permanent magnet synchronous motor; a heat dissipation component, which is installed in the heat dissipation cavity, and used to dissipate heat for the frequency conversion control circuit; a leakage protection module, which is installed on the box body, and is used to electrically connect a rectifier filter module and the power input interface, so as to protect the frequency conversion control circuit. The present invention divides the box body into a sealed cavity and a heat dissipation cavity, modularizes the frequency conversion control circuit, and installs them in corresponding chambers respectively, so as to solve the problems of poor waterproofness and poor heat dissipation efficiency of existing electrical cabinets, which affect normal use.

Description

Technical Field

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

[0002] The permanent magnet synchronous motor control box is a drive control device specially designed for permanent magnet synchronous motors. It is usually composed of multiple parts, such as power modules, voltage inverters, controllers, heat sinks, etc., as well as power input and output sockets or terminals. Its main function is to control the operation of the permanent magnet synchronous motor. It can adjust and control the motor's speed, direction, torque and other operating parameters to meet the needs of different application scenarios. The above structures are all installed in the inner cavity of the shell. At the same time, in order to meet the heat dissipation requirements, sufficient space (to form a heat dissipation channel) and a heat dissipation fan need to be reserved in the inner cavity of the shell, which will result in a large overall volume of the electrical cabinet.

[0003] Subsequently, an ultra-high-speed permanent magnet synchronous motor controller such as that disclosed in Chinese patent 2023204749199 appeared on the market. It mainly includes: a box, a power board, a main control board, a drive board, a busbar, a capacitor, an aviation plug, a shielding plate and an insulating seat. Although the overall structure is small, it is not waterproof and has extremely poor heat dissipation efficiency, and is only suitable for small-power permanent magnet motors.

[0004] When this type of controller is used on a permanent magnet synchronous motor pump for emergency drainage operations, it is required to be small in size and light in weight, and the smaller the better, the more convenient it is to use. Since the permanent magnet synchronous motor pump has high power, the controller will generate more heat. However, due to the poor heat dissipation efficiency of this type of controller, the bulky and large permanent magnet synchronous motor control box is currently commonly used. At the same time, due to the influence of the use environment, water is very easy to enter the box, causing a short circuit in the internal circuit, which will also affect the stable operation of the magnetic synchronous motor pump. Summary of the invention

[0005] The purpose of this technical solution is to provide a permanent magnet synchronous motor control box. Through a newly designed box and circuit, the box is divided into a sealed cavity and a heat dissipation cavity, the frequency conversion control circuit is modularized, and the power input interface and the power output interface are closely arranged together with the box, thereby reducing the space occupancy, reducing the overall volume and weight, and solving the problem that the existing electrical cabinets are small in size but cannot be waterproof and have good heat dissipation efficiency, which affects normal use.

[0006] The purpose of this technical solution is achieved in this way:

[0007] A permanent magnet synchronous motor control box, comprising:

[0008] A box body, in which a partition is arranged, wherein the partition divides the space inside the box body into a sealed cavity and a heat dissipation cavity;

[0009] A power input interface, which is installed on the box and is used to connect to a power source;

[0010] A frequency conversion control circuit, which is electrically connected to the power input interface and is used to control the operation of the permanent magnet synchronous motor;

[0011] A power output interface, which is mounted on the box and electrically connected to the frequency conversion control circuit, and is used to connect to a permanent magnet synchronous motor;

[0012] A heat dissipation component, which is installed in the heat dissipation cavity and is used to dissipate heat for the frequency conversion control circuit;

[0013] The leakage protection module is installed on the box body and is used to electrically connect the rectification and filtering module and the power input interface, so as to protect the frequency conversion control circuit.

[0014] Preferably, the frequency conversion control circuit has a power module located in the sealed cavity, and the power module is close to or in close contact with or has an end surface passing through the partition;

[0015] The heat dissipation component comprises:

[0016] a fan, which is installed in the heat dissipation cavity and located on one side of the heat dissipation hole 1; and

[0017] A heat sink having a heat dissipation channel, which is fixed to the other side of the partition corresponding to the power module;

[0018] A first heat dissipation hole and a second heat dissipation hole are respectively provided at two ends of the heat dissipation cavity;

[0019] The fan, the heat dissipation flow channel of the heat dissipation plate and the heat dissipation holes constitute a heat dissipation channel.

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

[0021] A rectifier and filter module, which is electrically connected to 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 channel 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 is provided with a corresponding through hole, the capacitor plate is located in the sealed cavity, the capacitor passes through the through hole and enters the heat dissipation cavity, and a sealant is provided between the through hole and the capacitor;

[0025] Alternatively, a wire hole is opened on the partition, the capacitor plate and several capacitors are fixed in the heat dissipation cavity, and a wire passes through the wire hole of the partition to electrically connect the rectifier and filter module, and a sealant is provided between the wire hole and the wire.

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

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

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

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

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

[0031] an operation display module, which is mounted on the box and electrically connected to the control module and is used to display information and input instructions; and

[0032] The motor detection module is installed in the sealed cavity and is electrically connected to the control module of the power module, and is used to detect the operating parameters of the permanent magnet synchronous motor.

[0033] Preferably, the control box also includes:

[0034] A wireless control module is electrically connected to the control module and is used to receive and send wireless signals; and a remote operation module is used to remotely control the wireless control module to achieve remote automatic control.

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

[0036] Heat dissipation gaps are respectively reserved between the partition, the PCB board and the shielding retaining frame.

[0037] Preferably, a plurality of spacers are provided on the heat dissipation hole 2, and an air intake channel is formed between the spacers. The cross-sectional shape of the air intake channel is at least one N-shaped flow channel or S-shaped flow channel, so as to form a water retaining area, a separation area and a water collecting area in the air intake channel;

[0038] A drainage hole is provided on the partition at the bottom of the water collection area for draining water in the water collection area.

[0039] Compared with the prior art, the technical solution has the following outstanding and beneficial technical effects:

[0040] 1. The technical solution is to newly design the box and circuit, divide the box into a sealed cavity and a heat dissipation cavity, re-layout the frequency conversion control circuit in conjunction with the sealed cavity and the heat dissipation cavity of the box, narrow the layout gap, and closely arrange the power input interface and the power output interface together with the box, thereby reducing the space occupied, reducing the overall volume, and reducing the weight. At the same time, the modules with serious heat generation are centrally arranged, and the heat dissipation cavity is used for key heat dissipation, so as to ensure that the volume is reduced while taking into account good heat dissipation and waterproof effects, thereby ensuring the stability and safety of the control box.

[0041] 2. In the design of this technical solution, the power module with serious heat generation is placed close to, close to 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, a fan is used to generate flowing air. When the heat sink is cooled, the partition and the power module are cooled, and the heat is dissipated without affecting the sealing of the sealed cavity.

[0042] 3. The capacitor unit of the rectifier and filter module of the present technical solution is at least partially placed in the heat dissipation channel of the heat dissipation cavity, so the flowing air will take away the heat from the capacitor unit while realizing the heat dissipation of the heat dissipation plate. The heat dissipation effect can be guaranteed to the maximum extent in combination with the heat dissipation channel.

[0043] 4. The air intake plate in the design of the present technical solution is formed with a unique air intake channel. From the perspective of the cross section, the shape of the cross section is at least an N shape or an S shape, thereby forming a water retaining area, a separation area and a water collecting area in the air intake channel. The water retaining area on the outside can block the falling water and prevent it from entering the interior. After entering the air intake channel, the water vapor mixed in the air will hit the separation area at high speed due to the curved channel shape. The water vapor will gather in the water collecting area along the side wall due to the impact, and then be discharged from the drainage holes in the water collecting area. This can ensure the dryness of the air entering the heat dissipation cavity, reduce the impact of water vapor on components, reduce the probability of short circuit, and ensure service life. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0046] Figure 3 for Figure 2 Cross-sectional view from AA perspective.

[0047] Figure 4 for Figure 2 Cross-sectional view from BB perspective.

[0048] Figure 5 Schematic diagram of the structure of the frame and partition of Example 1 of the present invention.

[0049] Figure 6 for Figure 4 Enlarged view of point C.

[0050] Figure 7 This is a schematic diagram of the structure after the box is hidden in Example 1 of the present invention.

[0051] Figure 8 for Figure 7 Exploded diagram.

[0052] Fig. 9 This is a logic diagram of the control box of Example 1 of the present invention.

[0053] Fig.10 This is a schematic diagram of Example 2 of the present invention.

[0054] Fig.11 It is a cross-sectional schematic diagram of embodiment 2 of the present invention.

[0055] Fig.12 Schematic diagram of the S-shaped air intake passage of Example 2 of the present invention.

[0056] Fig.13 Schematic diagram of the N-shaped air intake passage of Example 2 of the present invention.

[0057] Fig.14 It is a schematic diagram of variation 6 of the present invention.

[0058] 1. Box body; 2. Partition; 3. Sealed cavity; 4. Heat dissipation cavity; 5. Power input interface; 6. Frequency conversion control circuit; 7. Power output interface; 8. Heat dissipation component; 9. Power module; 10. Rectification and filtering module; 11. Capacitor unit; 12. Heat dissipation hole 1; 13. Heat dissipation hole 2; 14. Leakage protection module; 15. PCB board; 16. Shielding holder; 17. Support column; 18. Isolation column; 19. Heat dissipation gap; 20. Step abutment surface; 21. Through hole; 22. Through hole; 23. Fan; 24. Heat dissipation plate; 25. Partition; 26. Air inlet channel; 27. Water retaining area; 28. Separation area; 29. ​​Water collection area; 30. Fixed plate; 31. Heat sink; 32. Heat dissipation channel; 33. Control module; 34. Operation and display module; 35. Motor detection module; 37. Roller; 38. Pull rod; 39. Handle. DETAILED DESCRIPTION

[0059] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0060] Embodiment 1:

[0061] like Figure 1-5 As shown, a permanent magnet synchronous motor control box is mainly used to control the operation of the permanent magnet synchronous motor. In this embodiment, the permanent magnet synchronous motor for a pump is mainly used as an example. First, the permanent magnet synchronous motor control box mainly includes: a box body 1, a power input interface 5 for connecting to the mains / generator, a frequency conversion control circuit 6 for controlling the operation of the permanent magnet synchronous motor, a power output interface 7 for connecting the permanent magnet synchronous motor, a heat dissipation component 8 for heat dissipation and a leakage protection module 14 for protecting the frequency conversion control circuit 6; the power input interface 5, the power output interface 7 and the leakage protection module 14 are all installed on the box body 1, and the frequency conversion control circuit 6 and the heat dissipation component 8 are all installed in the box body 1.

[0062] Among them, the box body 1 mainly includes a hollow frame, a handle 39 is hinged on the upper end of the frame, and the lower end protrudes to form a supporting foot. An opening is opened on the frame, and a door panel 40 for sealing will be installed at the opening. The door panel 40 can be hinged or fixed with screws. A partition 2 is arranged inside the frame, and the partition 2 divides the internal space of the frame into a sealed cavity 3 and a heat dissipation cavity 4. Heat dissipation holes 13 and heat dissipation holes 12 are respectively opened on the side walls of the frame corresponding to the left and right ends of the heat dissipation cavity 4. Heat dissipation holes 13 and heat dissipation holes 12 are mainly used to connect the heat dissipation cavity 4 with the outside world.

[0063] like Figure 3 and Figure 4 As shown, the heat dissipation component 8 is installed in the heat dissipation cavity 4, and the frequency conversion control circuit 6 is mostly installed on the side of the partition 2 in the sealed cavity. The sealed cavity 3 has a waterproof function to ensure that the frequency conversion control circuit 6 will not be short-circuited due to water ingress. Air will flow through the heat dissipation component 8, thereby taking away the heat conducted to the partition by the frequency conversion control circuit 6, thereby achieving heat dissipation.

[0064] The technical solution is to redesign the box and circuit, divide the box into a sealed cavity and a heat dissipation cavity, re-layout the frequency conversion control circuit in conjunction with the sealed cavity and the heat dissipation cavity of the box, narrow the layout gap, centrally arrange the modules with severe heat generation, and use the heat dissipation cavity for focused heat dissipation, thereby ensuring a reduced volume while also taking into account a good heat dissipation effect, thereby ensuring the stability and safety of the control box.

[0065] For example, when using a permanent magnet synchronous motor pump for emergency drainage operations, in order to facilitate use and maximize the flood prevention effect, the size and weight of the electrical control box of the permanent magnet pump control equipment are required to be as small as possible. The technical solution is to integrate the equipment in the control box, integrate the frequency conversion control circuit 6, power input interface 5, power output interface 7, etc., compress the space, minimize the volume, and minimize the weight.

[0066] Combination Figure 1 In this embodiment, the heat dissipation hole 2 13 and the heat dissipation hole 1 12 are opened on the left and right sides, and the power input interface 5 and the power output interface 7 are arranged at the lower front part of the box body. In actual use, it can be used standing by supporting feet, and falling water will not enter from the heat dissipation hole 2 13 and the heat dissipation hole 1 12 on the left and right.

[0067] The partition plate can be integrally formed with the frame, or can be separately provided. The separate provision can be achieved by fixing with screws, or by welding or plugging, etc. to achieve the connection between the partition plate 2 and the frame. Figure 5 and Figure 6 The technical solution adopts a split setting, that is, a circle of convex edge 41 is protruded on the inner wall of the frame, and then a sealing groove 42 is recessed on the upper end face of the convex edge. A sealing ring is installed in the sealing groove, and then the edge of the partition is overlapped on the convex edge. There is also a connecting column 43 protruding on the inner wall of the frame, and a threaded hole is opened on the upper end of the connecting column. The partition is fixed by using the combination of screws and threaded holes, and the partition is installed and fixed in the frame. The sealing ring can play a sealing role.

[0068] The plug-in method can be to open a slot inside the frame, insert the partition 2 into the slot, and then fix the side panel to achieve installation and fixation. Alternatively, a convex strip is protruded inside the box 1, and then after the partition 2 is placed in the box 1, the edge of the partition 2 overlaps the convex strip, and then it can be fixed by screws or the like. If the sealing effect is good, a sealing ring can be set between the convex strip and the edge of the partition 2.

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

[0070] like Figure 3As shown, in the present technical scheme, two fixed edges 44 are arranged side by side in the heat dissipation cavity 4, and the fixed edge is located on one side of the heat dissipation hole 12. Then, the fan 23 is installed between the fixed edges, and the fan 23 is fixed by the cooperation of the fixed edge and the partition. In order to realize the electrical connection between the fan and the frequency conversion control circuit 6, a threading hole 46 is opened on the partition, and the electrical connection is realized by passing the wire through the threading hole 46. At the same time, a sealant is used to seal the gap between the threading hole 46 and the wire. The heat dissipation plate 24 is fixed to the other side of the partition 2 corresponding to the power module 9 of the frequency conversion control circuit by means of screws, and at the same time, an avoidance hole 45 is opened on the partition, so that the power module 9 can be partially placed in the avoidance hole 45, so that the power module 9 can be directly attached to the end face of the heat dissipation plate 24.

[0071] Due to the fixing of the screws, the end surface of the heat sink 24 is closely attached to the end surface of the partition 2, thereby achieving sealing. The gap between the avoidance hole 45 and the power module 9 will not be flooded, thereby ensuring the sealing effect of the sealed cavity.

[0072] The heat sink 24 includes a fixed plate 30 and a plurality of heat sinks 31; the heat sink 31 and the fixed plate 30 may be formed in one piece or in a separate arrangement. The separate arrangement may be to open a plurality of fixed grooves side by side on the fixed plate 30, insert the heat sink 31 into the corresponding fixed grooves in sequence, and form heat dissipation channels 32 between the inserted heat sinks 31. Such a design is convenient for processing on the one hand, and can minimize the intervals between the heat sinks 31 on the other hand, so that the heat sink 31 may be thinner and have a larger number of heat sinks 31, which can improve the heat dissipation effect of the heat sink 24.

[0073] In this way, the fan 23, the heat dissipation channel 32 of the heat dissipation plate 24 and the heat dissipation hole 2 13 constitute a heat dissipation channel, thereby achieving heat dissipation of the frequency conversion control circuit through the partition.

[0074] Another solution is to place the power module that generates severe heat close to or closely against the partition, and 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, a fan is used to generate air flow. When the heat sink is cooled, the partition and the power module are also cooled at the same time, and the heat is dissipated without affecting the sealing of the sealed cavity.

[0075] The end surface of the fixing plate 30 is in close contact with the partition 2, and the fixing plate 30 is fixed by screws or adhesives, and at the same time, the two ends of the heat dissipation channel 32 are respectively aligned with the heat dissipation hole 12 and the heat dissipation hole 2 13, so that a linear heat dissipation channel can be formed.

[0076] The fan can blow air toward the heat dissipation cavity or toward the outside of the heat dissipation cavity to form air flow. In this embodiment, the fan blows air toward the outside of the heat dissipation cavity 4. The air enters the heat dissipation cavity 4 from the heat dissipation hole 2 13, passes through the heat dissipation plate 24, and is directly discharged from the heat dissipation hole 1 12. The air flows in the heat dissipation cavity for a short time, which can ensure the heat dissipation effect.

[0077] like Figure 5 As shown, the sealed cavity 3 of the box body 1 mainly includes two parts, one part is the cavity 1 corresponding to the end face of the partition for supplying the frequency conversion control circuit 6, and the other part is the cavity 2 for accommodating the wires and facilitating wiring. The two cavities are interconnected, and both the cavity 1 and the cavity 2 have an opening. A cover plate is installed on the opening of the cavity 2 to achieve sealing and closure; the opening of the cavity 1 is a hinged door panel, and a sealing ring is arranged between the door panel and the opening to achieve sealing.

[0078] Furthermore, if Figure 7-Figure 9 As shown, the frequency conversion control circuit 6 includes a rectifier 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. The operation display module 34 mainly includes a display screen for displaying data parameters, a start-stop button for controlling start and stop, start and stop indicator lights and a speed control knob, etc.

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

[0080] like Figure 7 and Figure 8 As shown, in order to install and fix the frequency conversion control circuit 6, a plurality of support columns 17 are protruding from the partition, 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 retainer 16 is fixed on the isolation column 18 by screws. After installation, the shielding retainer 16 will cooperate with the partition 2 to form a shielding space, and modules that are susceptible to interference, such as the control module 33, are set to the outside of the shielding plate, and other modules are placed in the shielding space. In this way, the problem of module interference can be solved, thereby ensuring the stability of operation.

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

[0082] A heat dissipation gap 19 is left between the partition 2 and the PCB board 15 , and a heat dissipation gap 19 is also left between the PCB board 15 and the shielding holder 16 .

[0083] At the same time, a stepped abutting surface 20 is provided on the shielding plate, and a through hole 21 is provided beside the stepped abutting surface 20. After the end of the wiring row of the rectifier and filter module 10 passes through the through hole 21, the rear end of the wiring row abuts against the stepped abutting surface 20. With this design, the wiring row can be supported when wiring, reducing the connection strength requirements between the wiring row and the PCB board 15, and ensuring that the problem of module damage caused by the extra force generated by the wiring will not occur.

[0084] At the same time, since the power module 9 has an IGBT unit, which is the main heat source, in order to ensure the heat dissipation of the IGBT unit, the IGBT unit is set on the back of the PCB board 15, and then the IGBT unit is placed in the avoidance hole 45 of the partition 2, so that the IGBT unit directly contacts the heat sink, and thermal conductive silicone is applied between the two for heat conduction. This arrangement solves the heat dissipation problem of the IGBT unit.

[0085] like Figure 3 and Figure 7 As shown, in order to further ensure the heat dissipation effect of the frequency conversion control circuit 6, the capacitor unit 11 of the rectifier and filter module 10 is at least partially located in the heat dissipation channel of the heat dissipation cavity 4. That is, a number of through holes 22 will be opened on the partition 2, and 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. This embodiment takes 6 capacitors as an example. During installation, the capacitor is passed through the corresponding through hole 22 to be placed in the heat dissipation cavity 4, and then the gap between the through hole 22 and the capacitor is sealed with sealant. After such a design, the air in the heat dissipation cavity will directly dissipate the heat of the capacitor, and then cooperate with the heat dissipation plate to achieve overall heat dissipation.

[0086] In this embodiment, the capacitor is installed at a position close to the heat dissipation hole 2 of the heat dissipation cavity, so that the wind first passes through the capacitor unit, then passes through the heat dissipation plate 24, and then is discharged from the heat dissipation hole 1.

[0087] Because if the air passes through the heat sink 24 first and then 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 first dissipates heat to the capacitor and then to the heat sink.

[0088] refer to Figure 4 and Figure 5In order to facilitate the installation of the heat dissipation component, the partition is set separately. After the heat dissipation plate is fixed on the partition, the partition is fixed. After installation, the lower end of the heat sink 31 will abut against the bottom inner wall of the heat dissipation cavity. On the one hand, it ensures the tightness of the fit between the fixed plate 30 and the partition 2, and at the same time it can support the partition 2, reduce deformation, and ensure the effect of heat transfer. At the same time, the abutment setting can ensure that the air passes completely through the heat sink, improve the utilization of air, and ensure the heat dissipation effect.

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

[0090] Both can be produced by integral molding.

[0091] Embodiment 2:

[0092] The structure of this embodiment is basically the same as that of Embodiment 1, except that the structure of the box is slightly different, as described below.

[0093] Combination Fig.10 and Fig.11 In this embodiment, the box body also includes a frame body and a partition. The partition is arranged in the frame body to form a sealed cavity 3 and a heat dissipation cavity 4. The sealed cavity 3 is not divided into two chambers, but only one chamber. The frequency conversion control circuit 6 is installed in the sealed cavity 3, and the heat dissipation hole 2 13 and the heat dissipation hole 1 12 are respectively opened at both ends of the length direction of the box body. The partition body does not have an avoidance hole, so that the power module 9 is directly close to the partition body, and the thermal conductivity of the material is used to realize heat transfer and heat dissipation.

[0094] The connection ports of the power input interface 5 and the power output interface 7 face downwards, and when in use, they are placed horizontally on the ground to absorb air and dissipate heat horizontally.

[0095] Alternatively, the connection ports of the power input interface 5 and the power output interface 7 are oriented forward so as to be in the same direction as the display screen, so that the connection can be used vertically.

[0096] Combination Fig.10 and Fig.11 The box body 1 is also provided with a roller 37 and a pull rod 38, and the cooperation between the pull rod 38 and the roller 37 facilitates the movement of the box body 1 as a whole;

[0097] The pull rod 38 is fixed on the cover plate 2.

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

[0099] Embodiment 3:

[0100] This embodiment is basically the same as other embodiments, except that a new spacer 25 is provided in the heat dissipation hole 2 13 , as described below.

[0101] Since the control box has various usage scenarios and a capacitor unit is provided in the heat dissipation cavity 4 , the heat dissipation cavity 4 must also have a certain waterproof capability.

[0102] like Fig.12 and Fig.13 As shown, a plurality of spacers 25 are provided at the heat dissipation hole 13. The spacers 25 can be provided at the heat dissipation hole 13 in one piece or in parts. An air inlet channel 26 is formed between the spacers 25. The cross-sectional shape of the air inlet channel 26 is at least one N-shape or S-shape, thereby forming a water retaining area 27, a separation area 28 and a water collection area 29 in the air inlet channel 26. A drainage hole is provided on the spacer 25 at the bottom of the water collection area 29 for discharging water in the water collection area 29.

[0103] The spacer 25 can be arranged in a split manner and can be fixed by bolts or plugged in.

[0104] The air intake plate in the design of the present technical solution is formed with a unique air intake channel. From the perspective of the cross section, the shape of the cross section is at least one N-shape or S-shape, thereby forming a water retaining area 27, a separation area 28 and a water collecting area 29 in the air intake channel. The opening of the water retaining area 27 is set in a direction, the separation area 28 is set upward and connected to the rear end of the water retaining area 27, and the water collecting area 29 is connected to the rear end of the separation area 28.

[0105] In this way, the water retaining area on the outside can block the falling water due to the design of the opening direction, so that it will not easily enter the heat dissipation cavity. After entering the air intake channel, the water vapor mixed in the air will collide with the surface of the separation area at high speed due to the curved channel shape. The water vapor will be separated due to the impact, and the separated small water droplets will gather in the water collection area along the side wall, and then be discharged from the drainage holes in the water collection area. This can ensure the dryness of the air entering the heat dissipation cavity, reduce the influence of water vapor on components, reduce the probability of short circuit, and ensure the service life.

[0106] In order to prevent debris or living things from entering the heat dissipation cavity 4 during transportation or storage, a sealing plate can be provided on the box body 1 to block the heat dissipation hole 2 13 and the heat dissipation hole 1 12, thereby reducing the entry of foreign matter.

[0107] Embodiment 4:

[0108] The structure of this 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 opened on the partition 2, and 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 a wire passes through the wire hole of the partition 2, thereby electrically connecting the rest of the rectifier and filter module 10, and a sealant is provided between the wire hole and the wire.

[0109] Embodiment 5:

[0110] The structure of this embodiment is basically the same as that of other embodiments, except that the materials of the box body and the partition can be different. The box body and the partition can be made of different materials according to the different powers used.

[0111] For example, at low power, a plastic container can be used, and the partition can be made of plastic or metal.

[0112] When the power is high, an all-metal design can be used to achieve heat dissipation as a whole.

[0113] You can choose according to the actual situation.

[0114] Embodiment 6:

[0115] like Fig.14 As shown, in order to improve the convenience of control, a wireless control module and a remote operation module can be additionally provided. The wireless control module is electrically connected to the control module for receiving and sending wireless signals. The remote operation module can be a mobile phone terminal for remotely controlling the wireless control module to realize remote automated control.

[0116] The above shows and describes the basic principle and main features of the technical solution and the advantages of the technical solution. The technicians in this industry should understand that the technical solution is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the technical solution. Without departing from the spirit and scope of the technical solution, the technical solution will have various changes and improvements, which fall within the scope of the technical solution to be protected. The scope of protection claimed by the technical solution is defined by the attached claims and their equivalents.

Claims

1. A permanent magnet synchronous motor control box, characterized in that: include: A box body (1) is provided with a partition (2) therein, wherein the partition (2) divides the space inside the box body (1) into a sealed cavity (3) and a heat dissipation cavity (4); A power input interface (5), which is mounted on the box (1) and is used to connect to a power source; A frequency conversion control circuit (6), which is electrically connected to the power input interface (5) and is used to control the operation of the permanent magnet synchronous motor; A power output interface (7), which is mounted on the housing (1) and is electrically connected to the frequency conversion control circuit (6) and is used to connect to a permanent magnet synchronous motor; A heat dissipation component (8), which is installed in the heat dissipation cavity (4) and is used to dissipate heat from the frequency conversion control circuit (6); as well as A leakage protection module (14) is installed on the box (1) and is used to electrically connect the frequency conversion control circuit (6) and the power input interface (5), thereby protecting the frequency conversion control circuit (6).

2. The permanent magnet synchronous motor control box according to claim 1, characterized in that: The frequency conversion control circuit (6) has a power module (9) located in the sealed cavity (3), and the power module (9) is close to or in close contact with or has an end surface passing through the partition (2); A heat dissipation hole 1 (12) and a heat dissipation hole 2 (13) are respectively provided at two ends of the heat dissipation cavity (4); The heat dissipation component (8) comprises: a fan (23), which is installed in the heat dissipation cavity (4) and located on one side of the heat dissipation hole one (12); and A heat dissipation plate (24) having a heat dissipation channel (32) and fixed on the other side of the partition (2) corresponding to the power module (9); The fan (23), the heat dissipation channel (32) of the heat dissipation plate (24) and the second heat dissipation hole (13) constitute a heat dissipation channel.

3. The permanent magnet synchronous motor control box according to claim 2, characterized in that: The frequency conversion control circuit (6) has: A rectifier and filter module (10), which is electrically connected to the power input interface (5) and the power module (9); 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).

4. The permanent magnet synchronous motor control box according to claim 3 is characterized in that: The capacitor unit (11) comprises a capacitor plate and a plurality of capacitors located on the capacitor plate; The partition (2) is provided with a corresponding through hole (22), the capacitor plate is located in the sealed cavity (3), the capacitor passes through the through hole (22) and enters the heat dissipation cavity (4), and a sealant is provided between the through hole (22) and the capacitor; Alternatively, a wire hole is provided on the partition (2), the capacitor plate and the plurality of capacitors are fixed in the heat dissipation cavity (4), and a wire is passed through the wire hole of the partition (2), thereby electrically connecting the rectifier and filter module (10), and a sealant is provided between the wire hole and the wire.

5. The permanent magnet synchronous motor control box according to claim 4, characterized in that: The heat dissipation plate (24) comprises a fixed plate (30) and a plurality of heat dissipation fins (31). The end surface of the fixed plate (30) is in close contact with the partition (2). A fixing groove is provided on the fixed plate (30). The heat dissipation fins (31) are sequentially inserted into the corresponding fixing grooves, and a heat dissipation channel (32) is formed between two adjacent heat dissipation fins. The two ends of the heat dissipation channel (32) are respectively aligned with the heat dissipation hole 1 (12) and the heat dissipation hole 2 (13), thereby forming a linear heat dissipation channel.

6. The permanent magnet synchronous motor control box according to claim 1, characterized in that: The box body (1) and the partition plate (2) are formed in one piece or in separate pieces. The material of the box (1) is metal or plastic; The material of the partition (2) is metal or plastic.

7. The permanent magnet synchronous motor control box according to any one of claims 3 to 6, characterized in that: The frequency conversion control circuit (6) further comprises: an operation display module (34), which is mounted on the housing (1) and electrically connected to the control module of the power module (9) and is used for displaying information and inputting instructions; and A motor detection module (35) is installed in the sealed cavity (3) and is electrically connected to the control module of the power module (9) and is used to detect operating parameters of the permanent magnet synchronous motor.

8. The permanent magnet synchronous motor control box according to claim 1, characterized in that: The control box also includes: a wireless control module, electrically connected to the control module, for receiving and sending wireless signals; and The remote operation module is used to remotely control the wireless control module to achieve remote automatic control.

9. The permanent magnet synchronous motor control box according to claim 2, characterized in that: A PCB board (15) and a shielding holder (16) are arranged in the sealed cavity (3); the PCB board (15) is arranged on a supporting column (17) of the partition (2); an isolation column (18) is arranged on the PCB board (15); the shielding holder (16) is mounted on the PCB board (15) via the isolation column (18); the shielding holder (16) cooperates with the partition (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 (2), the PCB board (15) and the shielding retaining frame (16).

10. The permanent magnet synchronous motor control box according to claim 1, characterized in that: A plurality of spacers (25) are provided on the heat dissipation hole 2 (13) of the heat dissipation cavity (4), and an air intake channel (26) is formed between the spacers (25), and the cross-sectional shape of the air intake channel (26) is at least one N-shaped flow channel or an S-shaped flow channel, so that a water retaining area (27), a separation area (28) and a water collecting area (29) are formed in the air intake channel (26); A drainage hole is provided on the partition (25) at the bottom of the water collection area (29) for draining water in the water collection area (29).

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