Inverter structure of integrated motor rear end cover

Abstract

The utility model relates to an inverter structure integrated with a rear end cover of a motor, which is mounted at one end of the motor and is internally provided with a power module and a thin-film capacitor, the inverter comprises a box body, the box body comprises a bottom plate and a cylindrical coaming, and the coaming is fixed on a first end face, far away from the motor, of the bottom plate; the first end face is provided with a first cooling loop used for heat dissipation of the power module, an oil way and an oil cooler, the second end face, facing the motor, of the bottom plate is provided with a second cooling loop used for heat dissipation of the thin-film capacitor, the oil way is communicated with the interior of the motor, and the first cooling loop is communicated with the second cooling loop. And the oil cooler is respectively communicated with the second cooling loop and the oil path. Compared with the prior art, the LED lamp has the advantages of high structural integration, convenience in assembly, good structural heat dissipation effect, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile field especially a kind of inverter structure of integrated motor rear end cover. BACKGROUND

[0002] With the annual growth of new energy vehicle sales, better driving performance becomes the development goal of new energy vehicles, and the layout of the whole vehicle plays a key role in the driving performance of the vehicle. Therefore, more integrated and more economical electric drive system becomes one of the important concerns of the market.

[0003] As the utility model with publication number CN206790362U discloses a kind of vehicle inverter, it includes: shell;Cooling bottom plate, set between the shell and the motor;Upper cover, fixed on the upper end of the shell, for sealing the opening of the upper end of the shell;Wherein, the cooling bottom plate is fixed with capacitor, power module, current sensor and AC terminal block;DC terminal block is fixed on the upper cover, and the power module and the current sensor are provided with the circuit board above.

[0004] However, the above-mentioned existing inverter platform, motor rear end cover and controller box are mostly separate design, which generates more parts, resulting in higher cost of electric drive assembly, more complex assembly process, and certain influence on vehicle layout. In addition, for the inverter of conventional layout, the waterway is more difficult to pass through the film capacitor mounting surface, and cannot directly cool the capacitor, resulting in higher temperature rise of the capacitor and certain limitation on service life. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of the above-mentioned prior art, such as many parts of separate structure, high cost and complex assembly, and providing an inverter structure integrated with motor rear end cover.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] An inverter structure integrated with motor rear end cover is installed at one end of the motor and has power module and film capacitor inside. The inverter includes a box body, which includes a bottom plate and a cylindrical fence fixed on the first end face of the bottom plate away from the motor. A first cooling circuit for heat dissipation of the power module, an oil circuit and an oil cooler are arranged on the first end face. A second cooling circuit for heat dissipation of the film capacitor is arranged on the second end face of the bottom plate facing the motor. The oil circuit is connected to the inside of the motor. The first cooling circuit is connected to the second cooling circuit. The oil cooler is connected to the second cooling circuit and the oil circuit respectively.

[0008] Preferably, the inverter further comprises a box cover, which is installed at one end of the coaming away from the bottom plate, and a suspension structure is integrated at one end of the coaming away from the coaming, and a reinforcing rib is arranged between the suspension structure and the coaming.

[0009] Preferably, the reinforcing rib is a radial structure.

[0010] Preferably, a filter assembly is arranged in the box body, an energy distribution unit is integrated on the filter assembly, and the film capacitor is located between the filter assembly and the power module.

[0011] Preferably, a heat dissipation needle is arranged on the power module, and a mounting groove is arranged on one side of the first cooling circuit close to the power module, and the heat dissipation needle is inserted into the first cooling circuit through the mounting groove.

[0012] Preferably, a sealing ring is arranged between the power module and the mounting groove.

[0013] Preferably, the inverter structure is coaxially arranged with the motor.

[0014] Preferably, a bearing mounting seat is arranged on the first end surface of the bottom plate, and a motor rotary variable mounting groove is arranged in the bearing mounting seat.

[0015] Preferably, a PCBA board is further arranged in the box body, and the PCBA board is installed at one end of the power module away from the bottom plate and connected with the power module.

[0016] Preferably, a high-voltage power distribution box is arranged on the outer wall of the coaming, and a high-voltage power taking unit is arranged in the high-voltage power distribution box.

[0017] Compared with the prior art, the inverter has the following advantages:

[0018] (1) In the scheme, the inverter is installed at the rear end of the motor, and an oil channel is arranged at one end of the bottom plate facing the motor, the motor rear end cover, the motor oil channel and the inverter box body are integrated and processed in an integrated manner, the structure and assembly process are simplified, the cost is reduced, the power density of the electric drive assembly is improved, the possibility of vehicle arrangement is improved, and the inverter design is more convenient as a platform. In addition, the cooling channel in the inverter box body flows from the water outlet of the power module heat dissipation circuit, through the heat dissipation circuit of the film capacitor, into the oil cooler of the motor oil channel, which has the effect of directly cooling the film capacitor and cooling the oil of the oil-cooled motor, thereby improving the service life of the electric drive assembly.

[0019] (2) The scheme integrally arranges a suspension structure on the box cover, and a reinforcing rib of a radial structure is arranged between the suspension structure and the coaming, thereby improving the reliability of the connection between the suspension structure and the coaming, and making the box cover with the integrated suspension structure at the upper end have high overall stiffness and modal. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 An explosion structure schematic view of the inverter is provided in the utility model;

[0021] Figure 2 A structure schematic view of the box first visual angle is provided in the utility model;

[0022] Figure 3 A structure schematic view of the box cover is provided in the utility model;

[0023] Figure 4 A structure schematic view of the box connecting motor one end is provided in the utility model;

[0024] In the drawing: 1, box, 11, bottom plate, 12, coaming, 13, first end face, 14, second end face, 2, box cover, 21, suspension structure, 22, reinforcing rib, 3, power module, 4, thin film capacitor, 5, filter assembly, 6, PCBA board, 7, high voltage power unit, 8, bearing mounting seat, 9, first cooling circuit. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0027] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0028] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model.

[0029] It needs to explain that the term "first", "second" is only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0030] In addition, the terms "horizontal", "vertical" and other terms do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. As "horizontal" only means that its direction is more horizontal relative to "vertical", not that the structure must be completely horizontal, but can be slightly inclined.

[0031] Example 1

[0032] As Figure 1 and Figure 4 As shown in the embodiment, an inverter structure integrated with a motor rear end cover is provided, which is installed at one end of the motor and internally provided with a power module 3 and a film capacitor 4, characterized in that the inverter comprises a box body 1, the box body 1 comprises a bottom plate 11 and a cylindrical enclosing plate 12, the enclosing plate 12 is fixed on a first end face 13 of the bottom plate 11 away from the motor; the first end face 13 is provided with a first cooling circuit 9 for heat dissipation of the power module, an oil circuit and an oil cooler, the second end face 14 of the bottom plate 11 facing the motor is provided with a second cooling circuit for heat dissipation of the film capacitor, the oil circuit is communicated with the inside of the motor, the first cooling circuit 9 is communicated with the second cooling circuit, and the oil cooler is respectively communicated with the second cooling circuit and the oil circuit.

[0033] The inverter is installed at the rear end of the motor, and an oil passage is arranged at one end of the bottom plate 11 towards the motor, the motor rear end cover, the motor oil passage and the inverter box are integrated, the structure and the assembly process are simplified, the cost is reduced, the power density of the electric drive assembly is improved, the possibility of vehicle arrangement is improved, and the inverter is more convenient as a platform design. In addition, the cooling channel in the inverter box flows from the water outlet of the power module heat dissipation loop, through the heat dissipation loop of the film capacitor, into the motor oil cooler of the motor oil passage, has the effect of directly cooling the film capacitor, and can also cool the oil of the oil-cooled motor, thereby prolonging the service life of the electric drive assembly.

[0034] The preferred embodiment, as shown in Figure 1 and Figure 3 The inverter further comprises a box cover 2, which is installed at one end of the coaming 12 away from the bottom plate 11, and the end of the box cover 2 away from the coaming 12 is integrated with a suspension structure 21, and a reinforcing rib is arranged between the suspension structure 21 and the box cover 2. The reinforcing rib is a radial structure.

[0035] The suspension structure is integrated on the box cover, and the reinforcing rib with a radial structure is arranged between the suspension structure and the box cover, thereby improving the reliability of the connection between the suspension structure and the box cover, and making the box cover with the integrated suspension structure at the upper end have high overall stiffness and modal.

[0036] Further, the box 1 is provided with a filter assembly 5, the filter assembly 5 is integrated with an energy distribution unit, and the film capacitor 4 is located between the filter assembly 5 and the power module 3.

[0037] The high-voltage network of the whole vehicle takes power from the fuse terminal through the input end of the filter, realizes the PDU energy distribution function, integrates the energy distribution unit with the inverter, improves the integration of the whole vehicle, and reduces the production cost of the whole vehicle.

[0038] Specifically, the power module 3 is provided with a heat dissipation needle, and the first cooling loop 9 is provided with a mounting groove on the side close to the power module, and the heat dissipation needle is inserted into the first cooling loop 9 through the mounting groove. The power module and the mounting groove are provided with a sealing ring.

[0039] In this embodiment, the water cooling loop is arranged by friction stir welding, the first cooling loop is introduced into the motor oil cooler from the water outlet of the power module, cooperates with the second cooling loop to flow through the bottom of the film capacitor mounting surface, realizes efficient heat dissipation of multiple devices, and improves the overall service life of the inverter.

[0040] Specifically, as shown in Figure 1 and Figure 2As shown, the inverter structure is coaxially arranged with the motor. The first end surface 13 of the bottom plate 11 is provided with a bearing mounting seat 8, and the bearing mounting seat 8 is provided with a motor rotary variable mounting groove. The box body 1 is also provided with a PCBA board 6, which is installed at the end of the power module away from the bottom plate 11 and connected with the power module. The outer side wall of the baffle 12 is provided with a high-voltage distribution box, and the high-voltage distribution box is provided with a high-voltage power taking unit 7.

[0041] Specifically, the internal components of the inverter mainly include filter assemblies 5, film capacitors 4, power modules 3, PCBA boards 6, three-phase brackets and other components, which have the functions of traditional inverters. At the same time, the rear end cover of the motor and the cooling oil circuit of the motor are integrated with the motor, which reduces the production cost of the two-in-one assembly and simplifies the assembly process.

[0042] In combination with the above preferred embodiments, the rear end cover structure of the motor is integrated at the lower end of the box body, the box body is directly installed on the motor by using the rear end cover structure, the bearing mounting seat is arranged on the rear end cover structure, the motor rotary variable mounting groove is arranged in the bearing mounting seat, the function of the rear end cover of the motor is integrated with the box body, and the flange matched with the motor is arranged at the bottom of the box body to reliably connect with the motor. The cooling water circuit in the rear end cover structure flows into the oil cooler after heat dissipation of the power module and the film capacitor, exchanges heat with the oil circuit in the oil cooler, and cools the oil circuit. The cooling circuit improves the heat dissipation effect of the inverter and effectively prolongs the service life of the internal components of the inverter.

[0043] Among them, the power module is placed between the corresponding box 1 slot and the box, sealed by a sealing ring, the film capacitor is located between the power module and the filter assembly, the input terminal is overlapped on the positive and negative electrodes of the filter output terminal, the output terminal is overlapped on the input terminal of the power module, and the zero component is locked by the cross bolt fixation method; the PCBA board is placed above the power module, and the signal terminal is connected by soldering; the three-phase copper bar assembly is placed above the current sensor and fixed by bolt connection, and the box cover of the inverter is fixed on the box 1 by the flange bolt.

[0044] The above describes the preferred embodiments of the present application. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. An inverter structure integrated with a motor rear end cover, installed at one end of a motor and having a power module (3) and a film capacitor (4) inside, characterized in that, The inverter comprises a box body (1), the box body (1) comprises a bottom plate (11) and a cylindrical enclosing plate (12), the enclosing plate (12) is fixed on the first end surface (13) of the bottom plate (11) away from the motor, the first end surface (13) is provided with a first cooling circuit (9) for heat dissipation of the power module, an oil circuit and an oil cooler, the second end surface (14) of the bottom plate (11) is provided with a second cooling circuit for heat dissipation of the film capacitor, the oil circuit is communicated with the inside of the motor, the first cooling circuit (9) is communicated with the second cooling circuit, and the oil cooler is communicated with the second cooling circuit and the oil circuit respectively.

2. The inverter structure integrated with a motor rear end cover according to claim 1, characterized in that, The inverter further comprises a box cover (2), the box cover (2) is installed at one end of the enclosing plate (12) away from the bottom plate (11), the end of the box cover (2) away from the enclosing plate (12) is integrated with a suspension structure (21), and a reinforcing rib (22) is arranged between the suspension structure (21) and the box cover (2).

3. The inverter structure integrated with a motor rear end cover according to claim 2, characterized in that, The reinforcing rib is a radial structure.

4. The inverter structure integrated with a motor rear end cover according to claim 1, characterized in that, The box body (1) is provided with a filter assembly (5), the filter assembly (5) is integrated with an energy distribution unit, and the film capacitor is located between the filter assembly and the power module.

5. The inverter structure integrated with a motor rear end cover according to claim 1, characterized in that, The power module is provided with a heat dissipation needle, one side of the first cooling circuit (9) close to the power module is provided with a mounting groove, and the heat dissipation needle is inserted into the first cooling circuit (9) through the mounting groove.

6. The inverter structure integrated with a motor rear end cover according to claim 5, characterized in that, A sealing ring is arranged between the power module and the mounting groove.

7. The structure of an inverter integrated with a rear end cover of an electric motor according to claim 1, wherein The inverter is coaxially arranged with the motor.

8. The structure of an inverter integrated with a rear end cover of an electric motor according to claim 1, wherein The first end surface (13) of the bottom plate (11) is provided with a bearing mounting seat (8), and the bearing mounting seat (8) is provided with a motor rotary variable mounting groove.

9. The structure of an inverter integrated with a rear end cover of an electric motor according to claim 1, wherein The box body (1) is further provided with a PCBA board (6), the PCBA board (6) is installed at one end of the power module away from the bottom plate (11) and connected with the power module.

10. The inverter structure integrated with a motor rear end cover according to claim 1, characterized in that, A high-voltage power distribution box is arranged on the outer wall of the enclosing plate (12), and the high-voltage power distribution box is provided with a high-voltage power taking unit (7).

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