CN114916213B

CN114916213B - New energy automobile motor control system's radiator structure

Info

Publication number: CN114916213B
Application number: CN202210840526.5A
Authority: CN
Inventors: 潘国栋
Original assignee: Evert Xuzhou Electronics Co ltd
Current assignee: Evert Xuzhou Electronics Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-09-30
Anticipated expiration: 2042-07-18
Also published as: CN114916213A

Abstract

The invention relates to the technical field of heat dissipation equipment and discloses a heat radiator structure of a motor control system of a new energy automobile. This new energy automobile motor control system's radiator structure, when the IGBT module during operation, the work of corresponding thermoelectric refrigeration module circular telegram, the heat that the IGBT module produced shifts fast, reduce the thermal resistance, the difference in temperature between each level has been reduced, reduce thermal stress, the while has also avoided piling up fast of temperature, make the high temperature only account for the long little part of operation, secondly, the operating current of thermoelectric refrigeration module is improved by the mutual-inductor, the mutual-inductor produces the electric current under the alternating current effect that the IGBT module was made, make the operating condition automatic allocation of radiating efficiency according to the IGBT module, the heat dissipation distribution is more reasonable, avoid local high temperature.

Description

Radiator structure of new energy automobile motor control system

Technical Field

The invention relates to the technical field of heat dissipation equipment, in particular to a heat radiator structure of a motor control system of a new energy automobile.

Background

The IGBT is the most main component in the motor controller, each motor corresponds to six groups of IGBT modules, and the IGBT modules control the circuit according to control instructions to convert direct current into alternating current with target frequency and voltage so as to control the rotating speed and output torque of the motor.

Since the current flowing through the IGBT is large, the IGBT generates a large amount of heat during operation, when the temperature is higher than the critical value, the IGBT can be damaged, the damage of the IGBT can influence the operation of the whole machine, therefore, the heat dissipation efficiency of the heat radiator directly influences the normal operation of the controller, when the heat dissipation and the heat generation are in a balanced state, the temperature is reduced one by one from the IGBT chip to the substrate, the radiator shell and the cooling liquid in the radiator, on one hand, the heat dissipation efficiency of the radiator is usually constant, i.e. the temperature of the cooling fluid is usually constant, while in operation of the IGBT, the heat generated is constantly changing as the power changes, the momentary temperature difference may be large, so that the IBGT module has larger thermal stress and shortens the service life of the module, on the other hand, the radiator can not react to the high temperature of the IGBT module, the IGBT module is maintained in a high-temperature area for a long time, and the IGBT module is damaged.

Secondly, the heat dissipation of the IGBT is uniform by the radiator, when the automobile runs at a low speed, the frequency of the current is low, the current is maintained in a positive half period or a negative half period for a long time, in a short time, the heat of each IGBT module is not uniform, the local heat dissipation cannot meet the heat generation, and the temperature of the IGBT module is higher than a critical value and is damaged.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the technical scheme of the radiator structure of the motor control system of the new energy automobile, when the IGBT module works, the corresponding thermoelectric refrigeration module is electrified to work, the heat generated by the IGBT module is quickly transferred, the temperature difference of each level is reduced, the thermal stress and the high-temperature duration are reduced, meanwhile, the radiating efficiency in each area is automatically distributed according to the working state of the IGBT module, the radiating efficiency distribution is more reasonable, and the problems provided by the prior art are solved.

The invention provides the following technical scheme: a radiator structure of a new energy automobile motor control system comprises a box body and an IGBT module, wherein the box body is connected with a back plate, a liquid cavity is formed between the back plate and the box body, an installation cavity for installing the IGBT module is formed in the upper surface of the back plate, the middle of the installation cavity is connected with a thermoelectric refrigeration module, the thermoelectric refrigeration module penetrates through the back plate and extends into the liquid cavity, a closed box is arranged at the bottom of the thermoelectric refrigeration module, a heat dissipation plate is arranged at the bottom of the closed box, a heat conduction sheet is connected to the cold end of the thermoelectric refrigeration module, and the hot end of the thermoelectric refrigeration module is tightly attached to the end face of the closed box;

two IGBT module a set of constitution an output line, every all be equipped with the mutual-inductor on the output line, the mutual-inductor constitutes a return circuit as power and two sets of thermoelectric refrigeration module, and is two sets of thermoelectric refrigeration module connects in parallel, every group thermoelectric refrigeration module all establishes ties there is the diode, two opposite directions of diode.

Preferably, the thermoelectric refrigeration module is connected in parallel with a compensation capacitor.

Preferably, a connecting wire between the mutual inductor and the thermoelectric refrigeration module penetrates through the liquid cavity to be communicated with the thermoelectric refrigeration module.

Preferably, the edge of the closed box is provided with a protruding edge, the back plate is connected with a pressing plate, and the pressing plate presses the protruding edge.

Preferably, the upper surface of backplate is equipped with netted recess, the conducting strip embedding is in the recess, and the cold junction of thermoelectric refrigeration module supports tight conducting strip from the bottom.

Preferably, a gap is left between the bottom of the heat conducting fin and the back plate.

The invention has the following beneficial effects:

1. this new energy automobile motor control system's radiator structure, when the IGBT module during operation, the thermoelectric refrigeration module circular telegram work that corresponds shifts the heat that the IGBT module produced fast reduces the thermal resistance, on the one hand, has reduced the difference in temperature between each level, reduces thermal stress, and on the other hand has also avoided piling up fast of temperature, makes the high temperature only account for the long part of operation, improves the life of IGBT module.

2. This new energy automobile motor control system's radiator structure, the operating current of thermoelectric refrigeration module is improved by the mutual-inductor, and the mutual-inductor produces the electric current under the alternating current effect that the IGBT module was made for the radiating efficiency is according to the operating condition automatic allocation of IGBT module, and the heat dissipation distribution is more reasonable, avoids local high temperature.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the case of the present invention;

FIG. 3 is a circuit diagram of the structure of the present invention;

FIG. 4 is a schematic view of the closure of the present invention;

FIG. 5 is a schematic view of a back plate according to the present invention;

fig. 6 is a schematic structural view of a back plate and a heat conductive sheet according to the present invention.

In the figure: 1. a case body; 2. a liquid chamber; 3. a mounting cavity; 4. a back plate; 5. a thermoelectric refrigeration module; 6. a heat conductive sheet; 7. a closure box; 8. an IGBT module; 9. a transformer; 10. a diode; 11. a compensation capacitor; 12. a protruding edge; 13. and (7) pressing a plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1 and 2, a radiator structure of a motor control system of a new energy automobile comprises a box body 1 and IGBT modules 8, the box body 1 is connected with a back plate 4, a liquid cavity 2 is arranged between the back plate 4 and the box body 1, a sealing strip is arranged between the back plate 4 and the box body 1 to prevent cooling liquid from flowing out, the back plate 4 has good thermal conductivity, the lower surface of the back plate 4 is provided with a grid plate to increase the contact area with the cooling liquid and guide the cooling liquid, the grid plate is omitted in the drawing, the liquid cavity 2 is provided with a liquid inlet and a liquid outlet and is communicated with a cooling liquid loop through the liquid inlet and the liquid outlet, the cooling liquid flows in from the liquid inlet and flows out from the liquid outlet, the upper surface of the back plate 4 is provided with mounting cavities 3 for mounting the IGBT modules 8, the number of the back plates 4 is two, each back plate 4 is provided with 6 mounting cavities 3 corresponding to 6 IGBT modules 8, the middle parts of the mounting cavities 3 are connected with electric temperature difference refrigeration modules 5, the thermoelectric refrigeration module 5 penetrates through the back plate 4 and extends into the liquid cavity 2, a sealing box 7 is arranged at the bottom of the thermoelectric refrigeration module 5, the sealing box 7 covers the thermoelectric refrigeration module 5, a sealing strip is arranged between the sealing box 7 and the back plate 4 to ensure sealing of cooling liquid, a heat dissipation plate is arranged at the bottom of the sealing box 7, a heat conduction sheet 6 is connected to the cold end of the thermoelectric refrigeration module 5, the hot end of the thermoelectric refrigeration module 5 is tightly attached to the end face of the sealing box 7, and the sealing box 7 increases heat conduction rate and reduces temperature difference;

please refer to fig. 3, a set of output line that constitutes of two IGBT modules 8, output line is connected with the binding post of three-phase motor respectively, all be equipped with mutual-inductor 9 on every output line, mutual-inductor 9 constitutes a return circuit with two sets of thermoelectric refrigeration modules 5 as the power, mutual-inductor 9 is as the power, change the heavy current into the undercurrent and supply power for two thermoelectric refrigeration modules 5, two thermoelectric refrigeration modules 5 correspond with two IGBT modules 8 respectively, two sets of thermoelectric refrigeration modules 5 connect in parallel, every thermoelectric refrigeration module 5 of group all connects in series has diode 10, the opposite direction of two diodes 10, when IGBT module 8 communicates, corresponding thermoelectric refrigeration module 5 communicates simultaneously, strengthen local radiating efficiency.

The thermoelectric refrigeration module 5 is connected in parallel with the compensation capacitor 11, and the on-off frequency of the IGBT module 8 is far greater than the frequency of the output current, so that the thermoelectric refrigeration module 5 is continuously electrified in the same positive period or negative period through the electricity storage of the compensation capacitor 11, and the heat dissipation efficiency is ensured.

Wherein, connecting wire between mutual-inductor 9 and thermoelectric refrigeration module 5 passes liquid chamber 2 and communicates with thermoelectric refrigeration module 5, and heavy current and undercurrent separation avoid heavy current to disturb undercurrent.

Referring to fig. 4, a protruding edge 12 is disposed on an edge of the sealing box 7, the back plate 4 is connected to a pressing plate 13, the pressing plate 13 presses the protruding edge 12, two ends of the pressing plate 13 are fixed to the back plate 4 through bolts, and the pressing force of the pressing plate 13 presses the protruding edge 12 and the sealing box 7, so as to ensure sealing between the sealing box 7 and the back plate 4.

Referring to fig. 5, a mesh-shaped groove is formed in the upper surface of the back plate 4, the heat conducting fin 6 is embedded in the groove, the cold end of the thermoelectric refrigeration module 5 abuts against the heat conducting fin 6 from the bottom, and the contact area between the IGBT module 8 and the cold end of the thermoelectric refrigeration module 5 is increased by the heat conducting fin 6.

Referring to fig. 6, a gap is left between the bottom of the heat conducting sheet 6 and the back plate 4, the back plate 4 is flush with the upper surface of the heat conducting sheet 6, and the gap increases thermal resistance, so that the temperature difference generated by the low temperature produced by the thermoelectric cooling module 5 acts more between the heat conducting sheet 6 and the IGBT module 8.

The working principle and the working process of the invention are as follows:

when the controller works, in a positive period or a negative period, the two IGBT modules 8 are in a group and are simultaneously connected and disconnected, sine wave or negative sine wave current is generated in a corresponding output line, corresponding current is generated in the mutual inductor 9, the corresponding thermoelectric refrigeration module 5 is electrified, the cold end conveys heat generated by the IGBT modules 8 to the hot end, the cooling efficiency of the working IGBT modules 8 is enhanced, and the heat of other non-working IGBT modules 8 is transferred to cooling liquid layer by layer.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a new energy automobile motor control system's radiator structure, includes box body (1) and IGBT module (8), box body (1) is connected with backplate (4), be equipped with sap cavity (2) between backplate (4) and box body (1), its characterized in that: the upper surface of the back plate (4) is provided with an installation cavity (3) for installing an IGBT module (8), the middle part of the installation cavity (3) is connected with a thermoelectric refrigeration module (5), the thermoelectric refrigeration module (5) penetrates through the back plate (4) and extends into the liquid cavity (2), the bottom of the thermoelectric refrigeration module (5) is provided with a closed box (7), the bottom of the closed box (7) is provided with a heat dissipation plate, the cold end of the thermoelectric refrigeration module (5) is connected with a heat conduction sheet (6), and the hot end of the thermoelectric refrigeration module (5) is tightly attached to the end face of the closed box (7);

the IGBT module is by 6 mutual independence IGBT modules (8) are constituteed, and every two are established ties be connected with an output line between IGBT module (8), every all be equipped with mutual-inductor (9) on the output line, mutual-inductor (9) constitute a return circuit as power and two sets of thermoelectric refrigeration module (5) that correspond, and are two sets of thermoelectric refrigeration module (5) are parallelly connected, every group thermoelectric refrigeration module (5) all establish ties and have diode (10), the opposite direction of two diode (10).

2. The heat radiator structure of the new energy automobile motor control system according to claim 1, characterized in that: and the thermoelectric refrigeration module (5) is connected with a compensation capacitor (11) in parallel.

3. The heat radiator structure of the new energy automobile motor control system according to claim 2, characterized in that: and a connecting wire between the mutual inductor (9) and the thermoelectric refrigeration module (5) penetrates through the liquid cavity (2) to be communicated with the thermoelectric refrigeration module (5).

4. The radiator structure of the new energy automobile motor control system according to claim 1, characterized in that: the edge of the closed box (7) is provided with a protruding edge (12), the back plate (4) is connected with a pressing plate (13), and the pressing plate (13) presses the protruding edge (12).

5. The radiator structure of the new energy automobile motor control system according to claim 1, characterized in that: the upper surface of backplate (4) is equipped with netted recess, conducting strip (6) embedding is in the recess, and thermoelectric refrigeration module's (5) cold junction supports tight conducting strip (6) from the bottom.

6. The radiator structure of the new energy automobile motor control system according to claim 5, characterized in that: and a gap is reserved between the bottom of the heat conducting sheet (6) and the back plate (4).