Permanent magnet traction inverter

Abstract

The application provides a permanent magnet traction inverter, which comprises a box body, and a power module and a traction control assembly arranged in the box body; wherein the box body is provided with a power mounting chamber and a control mounting chamber which are isolated from each other, the power module is mounted in the power mounting chamber, and the traction control assembly is mounted in the control mounting chamber; the power module is connected with the traction control assembly, each power module is connected with two driving motors, and the power module is used for controlling the driving motors to operate under the control of the traction control assembly. The permanent magnet traction inverter provided by the application adopts a modular design, simplifies the box body layout of the permanent magnet traction inverter, and is more convenient to assemble and maintain.

Description

Technical Field

[0001] This application relates to the field of vehicle components, and in particular to a permanent magnet traction inverter. Background Technology

[0002] Permanent magnet traction inverters, typically installed at the bottom of vehicles, primarily function to convert electrical energy between DC and AC systems. With the continuous development of vehicle technology, permanent magnet traction inverters, as a key component of vehicles, are also constantly being improved and developed. To achieve high efficiency, lightweight design, and ease of maintenance in permanent magnet traction inverter traction systems, their design must meet requirements such as convenient maintenance and modular design.

[0003] Existing permanent magnet traction inverter technology typically employs a 4×1C1M axis control mode, which involves modifying the existing asynchronous permanent magnet traction inverter enclosure to change from a 1C4M vehicle control mode to a 4×1C1M axis control mode. However, the significant increase in components leads to difficulties in internal component placement, unreasonable wiring paths, and challenges in meeting electromagnetic compatibility requirements, posing problems for assembly and maintenance.

[0004] Existing permanent magnet traction inverter technology also employs a single power module, with all power devices arranged on a heatsink. However, due to the large size of each module, the module design lacks versatility and is not conducive to modular circuit implementation. Furthermore, the placement and heat dissipation of the driver board also present problems. Moreover, all inverter units affect each other; a fault in one insulated-gate bipolar transistor (IGBT) can affect other inverter units, making it impossible to truly isolate the faulty unit. Summary of the Invention

[0005] This application provides a permanent magnet traction inverter to solve the problems of complex enclosure layout, difficult assembly and maintenance of traditional permanent magnet traction inverters.

[0006] This application provides a permanent magnet traction inverter, characterized in that it includes: a housing, and a power module and a traction control component disposed within the housing;

[0007] The enclosure contains a power installation chamber and a control installation chamber that are isolated from each other. The power module is installed in the power installation chamber, and the traction control component is installed in the control installation chamber.

[0008] The power module is connected to the traction control component, and each power module is connected to two drive motors. The power module is used to control the operation of the drive motors under the control of the traction control component.

[0009] Optionally, the permanent magnet traction inverter further includes: a fan and an aluminum profile heat sink disposed within the housing;

[0010] The enclosure contains a fan installation chamber and a central ventilation chamber. The fan is installed in the fan chamber, and the aluminum profile radiator is installed in the power installation chamber.

[0011] The aluminum profile heat sink is connected to the power module, and the aluminum profile heat sink and the fan are used to dissipate heat from the power module.

[0012] The power installation room, the fan installation room, and the central ventilation room are interconnected to form a ventilation channel.

[0013] Optionally, one side wall of the power installation chamber is a side panel of the enclosure, and the side panel is provided with an air inlet;

[0014] The bottom surface of the central ventilation chamber is the bottom plate of the box body, and the bottom plate is provided with an air outlet;

[0015] Both the air inlet and the air outlet are equipped with mesh-shaped ventilation filter covers.

[0016] Optionally, the permanent magnet traction inverter further includes: a line contactor disposed within the housing;

[0017] The enclosure contains a line contactor installation chamber that is isolated from other installation chambers, and the line contactor is installed in the line contactor installation chamber.

[0018] Each set of line contactors is connected to a power module and is used to control the corresponding power module to stop operating in the event of a fault.

[0019] The line contactor mounting chamber is also equipped with a discharge resistor and a diode assembly.

[0020] Optionally, the permanent magnet traction inverter further includes: a high-voltage output component, a low-voltage input / output component, and a high-voltage input component disposed on the outer wall of the housing;

[0021] The outer side panel of the enclosure is provided with a high-voltage output area, a low-voltage input / output area, and a high-voltage input area.

[0022] The high-voltage input component is installed in the high-voltage output area and connected to the high-voltage installation chamber for connecting to an external power source;

[0023] The low-voltage input / output assembly is installed in the low-voltage input / output area and connected to the control installation room for transmitting low-voltage control signals;

[0024] The high-voltage output component is installed in the high-voltage output area and connected to the power installation chamber for outputting the invertered AC power from the power module; the high-voltage output component includes a current sensor and an isolation contactor.

[0025] Optionally, the permanent magnet traction inverter further includes: an overvoltage suppression resistor disposed within the housing;

[0026] The overvoltage suppression resistor is installed in the power mounting chamber and is connected to the power module to provide overvoltage protection for the power module.

[0027] Optionally, the enclosure is provided with mutually isolated pre-charging installation chamber, low-voltage control installation chamber, circuit breaker installation chamber and high-voltage installation chamber;

[0028] The pre-charging installation compartment is equipped with a pre-charging contactor assembly; the low-voltage control installation compartment is equipped with a gate drive power supply, a high-speed circuit breaker control assembly, and a control power circuit breaker; the circuit breaker installation compartment is equipped with a fan control contactor, a fan circuit breaker, and a high-speed circuit breaker; and the high-voltage installation compartment is equipped with a garage power socket, a grounding current sensor assembly, a three-position switch, and a fuse assembly.

[0029] Optionally, the permanent magnet traction inverter further includes: a suspension beam fixed to the top plate of the enclosure;

[0030] The lifting beam is connected to the box body by ring groove rivets, which are used to firmly connect the box body to the vehicle.

[0031] Optionally, the power installation chamber includes a first power installation chamber and a second power installation chamber;

[0032] The control installation room is adjacent to the low-voltage input / output area and the line contactor installation room; the first power installation room is adjacent to the high-voltage output area and the fan installation room; the pre-charging installation room is between the control installation room and the low-voltage control installation room; the low-voltage control installation room is between the first power installation room and the pre-charging installation room.

[0033] The line contactor installation chamber is adjacent to the high-voltage installation chamber; the fan installation chamber is adjacent to the second power installation chamber; the central ventilation chamber is located between the line contactor installation chamber and the fan installation chamber.

[0034] The high-voltage installation chamber is adjacent to the high-voltage input area; the second power installation chamber is adjacent to the high-voltage output area; and the high-speed circuit breaker installation chamber is located between the high-voltage installation chamber and the second power installation chamber.

[0035] Optionally, the enclosure includes: a partition disposed inside the enclosure for isolating the installation chamber inside the enclosure;

[0036] The partition is welded to the top plate and the bottom plate, and the weld joint is coated with sealant.

[0037] The side plate is bolted to the bottom plate and the top plate; the side plate includes a door lock assembly and a handle.

[0038] The permanent magnet traction inverter provided in this application adopts a modular design, with two power modules inside. It integrates all components of the permanent magnet traction inverter, which not only simplifies the internal layout of the permanent magnet traction inverter and avoids the defects of difficult internal layout, difficulty in meeting electromagnetic compatibility requirements or excessive size of individual modules, but also realizes functions such as individual power module isolation in case of failure, modular replacement and rapid heat dissipation, thereby improving the versatility of the permanent magnet traction inverter. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the permanent magnet traction inverter according to Embodiment 1 of this application;

[0041] Figure 2 This is a schematic diagram of the air inlet and air outlet of the permanent magnet traction inverter according to Embodiment 1 of this application;

[0042] Figure 3A This is a schematic diagram of the front side of the input / output area of ​​the permanent magnet traction inverter according to Embodiment 1 of this application;

[0043] Figure 3B This is a schematic diagram of the structure on the back side of the input / output area of ​​the permanent magnet traction inverter according to Embodiment 1 of this application;

[0044] Figure 4 This is a schematic diagram of the lifting beam of the permanent magnet traction inverter according to Embodiment 1 of this application.

[0045] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims. The various embodiments in this application may be implemented individually or in combination without conflict.

[0047] The permanent magnet traction inverter provided in this application adopts a modular circuit design concept. The permanent magnet traction inverter housing has two power modules and integrates a high-speed disconnect module, a pre-charge module, a discharge module, an overvoltage suppression module, a filter module, a motor isolation module, a voltage detection module, and a current detection module. This not only simplifies the internal layout of the permanent magnet traction inverter and avoids the defects of difficult internal layout, difficulty in meeting electromagnetic compatibility requirements, or excessively large individual modules, but also realizes functions such as fault isolation, modular replacement, and rapid heat dissipation, thereby improving the versatility of the permanent magnet traction inverter.

[0048] Figure 1 This is a schematic diagram of a permanent magnet traction inverter structure provided in Embodiment 1 of this application. Referring to Figure 1, this embodiment provides a permanent magnet traction inverter that enables modular installation. Specifically, the system includes:

[0049] The housing, and the power module 5 and traction control assembly 13 disposed within the housing;

[0050] The housing contains a power installation chamber and a control installation chamber that are isolated from each other. The power module 5 is installed in the power installation chamber, and the traction control component 13 is installed in the control installation chamber.

[0051] The power module 5 is connected to the traction control component 13, and each power module is connected to two drive motors. The power module 5 is used to control the operation of the drive motors under the control of the traction control component 13.

[0052] For example, in a practical scenario: the permanent magnet traction inverter enclosure is located at the bottom of the vehicle and can be connected to the vehicle via a suspension beam. The status of the permanent magnet traction inverter can also be displayed in real time on the vehicle's dashboard. The permanent magnet traction inverter enclosure is divided into installation chambers of varying sizes by partitions for installing the permanent magnet traction inverter components. These installation chambers can be arranged adjacently or non-adjacently. Optionally, the isolation methods described in this application may include, but are not limited to, sealed isolation and non-sealed isolation. The power module 5 is installed in the power installation chamber, and the traction control component 13 is installed in the control installation chamber. The power module 5 is connected to the traction control module 13, and each power module is connected to two traction motors. The power module 5 controls the operation of the drive motors under the control of the traction control component 13. Optionally, the connection methods described in this application may include, but are not limited to, electrical connection, wired communication connection, etc.

[0053] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating various components of the permanent magnet traction inverter. This simplifies the internal layout of the permanent magnet traction inverter, avoids the defects of difficult internal layout, difficulty in meeting electromagnetic compatibility requirements, and excessively large individual modules, and improves the versatility of the permanent magnet traction inverter.

[0054] Optional, such as Figure 1 As shown, as one possible implementation, based on any other implementation, the permanent magnet traction inverter further includes: a fan 8 and an aluminum profile heat sink disposed in the housing;

[0055] The enclosure contains a fan installation chamber and a central ventilation chamber. The fan 8 is installed in the fan chamber, and the aluminum profile radiator is installed in the power installation chamber.

[0056] The aluminum profile heat sink is connected to the power module 5, and the aluminum profile heat sink and the fan are used to dissipate heat from the power module.

[0057] The power installation room, the fan installation room, and the central ventilation room are interconnected to form a ventilation channel.

[0058] For example, in a practical scenario: The permanent magnet traction inverter enclosure houses a fan 8 and an aluminum profile heat sink. The module base plate of the power module 5 serves as the mounting surface for the aluminum profile heat sink, integrated with it. The aluminum profile heat sink and power module are connected to the enclosure via mounting brackets on the bottom plate and installed together in the power mounting chamber. The fan 8 is installed in the fan mounting chamber and connected to both the fan control contactor and the fan circuit breaker. The power mounting chamber, fan mounting chamber, and central ventilation chamber within the permanent magnet traction inverter enclosure are interconnected without partitions, forming a ventilation channel to improve heat dissipation efficiency. In practical applications, the reactor 15 can also be installed in the central ventilation chamber.

[0059] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating various components of the permanent magnet traction inverter, simplifying the internal layout of the permanent magnet traction inverter. At the same time, it adopts two heat dissipation modes, namely heat sink heat dissipation and forced air cooling, which improves the heat dissipation efficiency of the permanent magnet traction inverter.

[0060] Optional, such as Figure 2 As shown, as one possible implementation, based on any other implementation, one side wall of the power installation chamber is a side panel of the enclosure, and the side panel is provided with an air inlet;

[0061] The bottom surface of the central ventilation chamber is the bottom plate of the box body, and the bottom plate is provided with an air outlet;

[0062] Both the air inlet and the air outlet are equipped with mesh-shaped ventilation filter covers.

[0063] For example, in a practical context: one side wall of the power installation chamber of the permanent magnet traction inverter enclosure is a side panel with an air inlet. The bottom surface of the central ventilation chamber is the bottom plate of the enclosure, and the bottom plate has an air outlet. This application does not limit the size of the air inlet and outlet, which can be adjusted according to the specific dimensions of the enclosure. The air inlet and outlet are equipped with mesh-like ventilation filter covers, which can be made of metal and are welded to the side panel and bottom plate of the enclosure to prevent foreign objects from entering the permanent magnet traction inverter.

[0064] In practical applications, the base plates of the central ventilation chamber and the fan installation chamber are detachable parts of the base plate of the enclosure. When installing the fan 8 and the reactor 15, the base plates of the central ventilation chamber and the fan installation chamber can be removed separately. After installation, the base plates of the central ventilation chamber and the installation chamber are spliced ​​back onto the base plate of the enclosure. When the fan or the reactor fails, the base plates of the central ventilation chamber and the installation chamber can be removed for repair or replacement.

[0065] The permanent magnet traction inverter provided in this embodiment integrates the various components of the permanent magnet traction inverter, simplifying the internal layout of the permanent magnet traction inverter. It adopts a channel and ventilation filter design to improve heat dissipation efficiency. At the same time, it is equipped with a removable base plate to improve maintenance efficiency and reduce maintenance costs.

[0066] Optional, such as Figure 1 As shown, as one possible implementation, based on any other implementation, the permanent magnet traction inverter further includes: a line contactor disposed within the housing;

[0067] The enclosure contains a line contactor installation chamber that is isolated from other installation chambers, and the line contactor is installed in the line contactor installation chamber.

[0068] Each set of line contactors is connected to a power module and is used to control the corresponding power module to stop operating in the event of a fault.

[0069] The line contactor mounting chamber is also equipped with a discharge resistor and a diode assembly 14.

[0070] In terms of actual distance: The permanent magnet traction inverter enclosure is also equipped with a line contactor installation chamber. The line contactor is installed in the line contactor installation chamber and connected to the power module 5. When the power module 5 fails, the line contactor immediately disconnects the power module 5, causing the power module 5 to stop operating.

[0071] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating various components of the permanent magnet traction inverter, simplifying the internal layout of the permanent magnet traction inverter, and realizing the function of individually cutting off the power module in case of failure, thereby enhancing the fault operation capability.

[0072] Optional, such as Figure 3A and Figure 3B As shown, as one possible implementation, based on any other implementation, the permanent magnet traction inverter further includes: a high-voltage output component, a low-voltage input / output component, and a high-voltage input component disposed on the outer wall of the housing;

[0073] The outer side panel of the enclosure is provided with a high-voltage output area, a low-voltage input / output area, and a high-voltage input area.

[0074] The high-voltage input component is installed in the high-voltage output area and connected to the high-voltage installation chamber for connecting to an external power source;

[0075] The low-voltage input / output assembly is installed in the low-voltage input / output area and connected to the control installation room for transmitting low-voltage control signals;

[0076] The high-voltage output component is installed in the high-voltage output area and connected to the power installation chamber for outputting the invertered AC power from the power module; the high-voltage output component includes a current sensor and an isolation contactor 7.

[0077] In practical applications, the high-voltage input area and the low-voltage input / output area are located on the same side of the enclosure and are connected to the high-voltage installation chamber and the control installation chamber, respectively. The high-voltage output area is located on the other side of the enclosure and is connected to the power installation chamber. The high-voltage output component may include a current sensor and an isolation contactor 7.

[0078] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating the high and low voltage input and output terminals of the permanent magnet traction inverter. This simplifies the layout of the input and output areas of the permanent magnet traction inverter, improves maintenance efficiency, and enhances the stability of the input and output of the permanent magnet traction inverter.

[0079] Optional, such as Figure 1 As shown, as one possible implementation, based on any other implementation, the permanent magnet traction inverter further includes: an overvoltage suppression resistor 6 disposed in the housing;

[0080] The overvoltage suppression resistor 6 is installed in the power installation chamber and is connected to the power module 5 to provide overvoltage protection for the power module 5.

[0081] To illustrate with a practical example: the overvoltage suppression resistor 6 is located inside the enclosure and installed together with the power module 5 in the power mounting chamber. Specifically, each power module 5 is connected to one overvoltage suppression resistor 6, ensuring that each power module 5 receives individual overvoltage protection. In actual applications, the overvoltage suppression resistor 6 and the power module 5 are installed in the upper part of the power mounting chamber. After installation, a horizontal partition is used to isolate the overvoltage suppression resistor 6, the power module 5, and the ventilation duct at the bottom of the power mounting chamber. Sealant is applied to the joint of the partition to ensure that the power module 5 and the overvoltage suppression resistor 6 are sealed.

[0082] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating all components to simplify its internal layout. It also implements overvoltage protection and sealed isolation for the power module, improving its operational stability.

[0083] Optional, such as Figure 1 As shown, as one possible implementation, based on any other implementation, the enclosure is provided with mutually isolated pre-charging installation chamber, low-voltage control installation chamber, circuit breaker installation chamber and high-voltage installation chamber;

[0084] The pre-charging installation compartment is equipped with a pre-charging contactor assembly 12; the low-voltage control installation compartment is equipped with a gate drive power supply 9, a high-speed circuit breaker control assembly 10, and a control power circuit breaker 11; the circuit breaker installation compartment is equipped with a fan control contactor, a fan circuit breaker, and a high-speed circuit breaker 4; the high-voltage installation compartment is equipped with a garage power socket 1, a grounding current sensor assembly 2, a three-position switch 3, and a fuse assembly.

[0085] For example, the permanent magnet traction inverter enclosure also includes a pre-charge installation chamber, a low-voltage control installation chamber, a circuit breaker installation chamber, and a high-voltage installation chamber. These chambers are isolated from each other and can be arranged adjacently or non-adjacently. Optionally, the isolation methods described in this application can include, but are not limited to, sealed isolation and non-sealed isolation. Specifically, the pre-charge installation chamber houses a pre-charge contactor assembly 12, which is connected to the power module 5; the low-voltage control installation chamber contains a gate drive power supply 9, a high-speed circuit breaker control assembly 10, and a control power circuit breaker 11, used for low-voltage side control of the permanent magnet traction inverter; the circuit breaker installation chamber houses a fan control contactor, a fan circuit breaker, and a high-speed circuit breaker 4; and the high-voltage installation chamber houses a garage power socket 1, a grounding current sensor assembly 2, a three-position switch, a fuse assembly 3, and a fuse assemblies. The high-voltage installation chamber is connected to the high-voltage input area for connecting to an external power source.

[0086] In practical applications, the permanent magnet traction inverter assembly is installed from the side panel of the permanent magnet traction inverter enclosure into the corresponding installation chamber. After installation, the side panel is connected to the bottom and top plates of the enclosure to maintain a sealed enclosure. The side panel of the permanent magnet traction inverter enclosure can be divided into smaller side panels of the same size as the sides of each installation chamber, depending on their dimensions. These smaller side panels can be connected to each other or detached individually. When a permanent magnet traction inverter assembly in a certain installation chamber fails, the corresponding side panel can be opened to replace the faulty assembly.

[0087] The permanent magnet traction inverter provided in this embodiment adopts a modular design, with two power modules inside. It integrates all components of the permanent magnet traction inverter, which simplifies the internal layout of the permanent magnet traction inverter, realizes the modular replacement function of traction components, improves the versatility of the permanent magnet traction inverter, and reduces the maintenance cost of the permanent magnet traction inverter.

[0088] Optional, such as Figure 4 As shown, as one possible implementation, based on any other implementation, the permanent magnet traction inverter further includes: a suspension beam fixed to the top plate of the housing;

[0089] The lifting beam is connected to the box body by ring groove rivets, which are used to firmly connect the box body to the vehicle.

[0090] For example, in a practical scenario: the suspension beam is installed on the top plate of the permanent magnet traction inverter. The top plate of the enclosure and the suspension beam can be connected via ring groove rivets. The number of suspension beams is not limited and can be adjusted according to the actual situation. Specifically, lifting lugs are provided at both ends of the suspension beam, which are bolted to the beam to fix it to the bottom of the vehicle. The materials of the suspension beam and lifting lugs are not limited and can be adjusted according to the actual situation.

[0091] The permanent magnet traction inverter provided in this embodiment is firmly connected to the bottom of the vehicle through a suspension beam, which improves the stability of the connection between the permanent magnet traction inverter and the vehicle.

[0092] Optionally, as one possible implementation, based on any other implementation, the power installation chamber includes a first power installation chamber and a second power installation chamber;

[0093] The control installation room is adjacent to the low-voltage input / output area and the line contactor installation room; the first power installation room is adjacent to the high-voltage output area and the fan installation room; the pre-charging installation room is between the control installation room and the low-voltage control installation room; the low-voltage control installation room is between the first power installation room and the pre-charging installation room.

[0094] The line contactor installation chamber is adjacent to the high-voltage installation chamber; the fan installation chamber is adjacent to the second power installation chamber; the central ventilation chamber is located between the line contactor installation chamber and the fan installation chamber.

[0095] The high-voltage installation chamber is adjacent to the high-voltage input area; the second power installation chamber is adjacent to the high-voltage output area; and the high-speed circuit breaker installation chamber is located between the high-voltage installation chamber and the second power installation chamber.

[0096] In practical applications, each power installation chamber is adjacent to a high-voltage output area and symmetrically arranged on both sides of the fan installation chamber to accelerate heat dissipation efficiency; the central ventilation area is adjacent to the fan installation chamber and is located in the middle of the enclosure to form a ventilation channel with the fan installation chamber and the power installation chamber; the high-voltage installation chamber is located on one side of the enclosure and adjacent to the high-voltage input area; the control installation chamber is also located on one side of the enclosure and adjacent to the low-voltage input and output area.

[0097] The permanent magnet traction inverter provided in this embodiment adopts a modular design, integrating the various components of the permanent magnet traction inverter. This not only simplifies the internal layout of the permanent magnet traction inverter and avoids the defects of difficult internal layout, difficulty in meeting electromagnetic compatibility requirements, and excessively large individual modules, but also reduces the volume of the permanent magnet traction inverter enclosure.

[0098] Optionally, as one possible implementation, based on any other implementation, the enclosure includes: a partition disposed inside the enclosure for isolating the installation chamber inside the enclosure;

[0099] The partition is welded to the top plate and the bottom plate, and the weld joint is coated with sealant.

[0100] The side plate is bolted to the bottom plate and the top plate; the side plate includes a door lock assembly and a handle.

[0101] For example, in a practical scenario: the partitions of the permanent magnet traction inverter enclosure are welded to the top and bottom plates. Specifically, the bottom plate of the central ventilation chamber and fan installation chamber is a detachable part of the enclosure's bottom plate and is not welded to the partitions. The partitions are bolted to the bottom and top plates. The partitions are equipped with door lock assemblies and handles. When a permanent magnet traction inverter assembly malfunctions, the door lock assembly is opened, and the side panel is removed for replacement.

[0102] The permanent magnet traction inverter provided in this embodiment adopts a modular design and integrates various components of the permanent magnet traction inverter, which simplifies the internal layout of the permanent magnet traction inverter. When a component of the permanent magnet traction inverter fails, the faulty component can be easily replaced individually, which improves the efficiency of maintenance and replacement and reduces maintenance costs.

[0103] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "top," "bottom," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," and "circumferential," etc., used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the indicated position or component must have a specific orientation, or a specific structure and operation, and therefore should not be construed as a limitation of this invention.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0106] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A permanent magnet traction inverter, characterized in that, The permanent magnet traction inverter comprises a box body, power modules and traction control assemblies arranged in the box body. The box body is provided with a power installation chamber and a control installation chamber which are isolated from each other, the power modules are installed in the power installation chamber, and the traction control assemblies are installed in the control installation chamber. The power modules are connected with the traction control assemblies, each power module is connected with two drive motors, and the power modules are used for controlling the drive motors to operate under the control of the traction control assemblies. The permanent magnet traction inverter further comprises a fan and an aluminum profile radiator arranged in the box body. The box body is provided with a fan installation chamber and a middle ventilation chamber, the fan is installed in the fan installation chamber, and the aluminum profile radiator is installed in the power installation chamber. The aluminum profile radiator is connected with the power modules, and the aluminum profile radiator and the fan are used for radiating the power modules. The power installation chamber, the fan installation chamber and the middle ventilation chamber are communicated with each other to form a ventilation channel, the bottom plates of the middle ventilation chamber and the fan installation chamber are detachable parts of the bottom plate of the box body, and the permanent magnet traction inverter further comprises line contactors arranged in the box body. The box body is provided with a line contactor installation chamber which is isolated from other installation chambers, and the line contactors are installed in the line contactor installation chamber. Each group of line contactors is connected with a power module and is used for controlling the corresponding power module to stop operating when a fault occurs. The line contactor installation chamber is further provided with a discharge resistor and a diode assembly. The permanent magnet traction inverter further comprises a high-voltage output assembly, a low-voltage input / output assembly and a high-voltage input assembly arranged on the outer wall of the box body. The side plate of the box body is provided with a high-voltage output area, a low-voltage input / output area and a high-voltage input area. The high-voltage input assembly is installed in the high-voltage output area and connected with the power installation chamber, and is used for connecting an external power supply. The low-voltage input / output assembly is installed in the low-voltage input / output area and connected with the control installation chamber, and is used for transmitting a low-voltage control signal. The high-voltage output assembly is installed in the high-voltage output area and connected with the power installation chamber, and is used for outputting alternating current inverted by the power modules. The box body is provided with a pre-charging installation chamber, a low-voltage control installation chamber, a circuit breaker installation chamber and a high-voltage installation chamber which are isolated from each other. The pre-charging installation chamber is provided with a pre-charging contactor assembly, the low-voltage control installation chamber is provided with a gate drive power supply, a high-speed circuit breaker control assembly and a control power circuit breaker, the circuit breaker installation chamber is provided with a fan control contactor, a fan circuit breaker and a high-speed circuit breaker, and the high-voltage installation chamber is provided with a garage power socket, a grounding current sensor assembly, a three-position switch and a fuse assembly. The power installation chamber comprises a first power installation chamber and a second power installation chamber. ​ The control installation chamber is adjacent to the low-voltage input and output area and the line contactor installation chamber; the first power installation chamber is adjacent to the high-voltage output area and the fan installation chamber; the pre-charge installation chamber is between the control installation chamber and the low-voltage control installation chamber; the low-voltage control installation chamber is between the first power installation chamber and the pre-charge installation chamber; The line contactor installation chamber is adjacent to the high-voltage installation chamber; the fan installation chamber is adjacent to the second power installation chamber; the middle ventilation chamber is between the line contactor installation chamber and the fan installation chamber; The high-voltage installation chamber is adjacent to the high-voltage input area; the second power installation chamber is adjacent to the high-voltage output area; the high-speed circuit breaker installation chamber is between the high-voltage installation chamber and the second power installation chamber.

2. The permanent magnet traction inverter of claim 1, characterized in that, One side wall of the power installation chamber is a side plate of the box body, and the side plate is provided with an air inlet; The bottom surface of the middle ventilation chamber is a bottom plate of the box body, and the bottom plate is provided with an air outlet; The air inlet and the air outlet are both provided with a grid-shaped ventilation filter cover.

3. The permanent magnet traction inverter of claim 1, wherein, The permanent magnet traction inverter further comprises an overvoltage suppression resistor arranged in the box body; The overvoltage suppression resistor is installed in the power installation chamber, and the overvoltage suppression resistor is connected with the power module for overvoltage protection of the power module.

4. The permanent magnet traction inverter of claim 1, wherein, The permanent magnet traction inverter further comprises a hanging beam fixed on the top plate of the box body; The hanging beam is connected with the box body through a ring groove rivet, and is used for firmly connecting the box body on the vehicle.

5. The permanent magnet traction inverter of claim 1, wherein, The box body comprises a partition plate arranged in the box body, which is used for isolating the installation chambers in the box body; The partition plate is welded with the top plate and the bottom plate, and the weld is coated with sealant; The side plate is connected with the bottom plate and the top plate through bolts; the side plate comprises a door lock assembly and a handle.

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