Electric engine cooling system, electric engine, electric propulsion device and aircraft

Abstract

The utility model provides an electric engine cooling system, an electric engine, an electric propulsion device and an aircraft, and relates to the technical field of aircrafts. The system comprises a motor cooling loop and a heat dissipation material arranged in the motor cooling loop, and the heat dissipation material is used for assisting the motor cooling loop to dissipate heat of a motor. The heat dissipation material is arranged in the motor cooling loop, the motor cooling loop is assisted by the heat dissipation material to dissipate heat of the motor, and especially when the motor works in the limiting working condition, the heat dissipation material can quickly absorb a part of heat and cooperate with the heat dissipater to dissipate heat of the motor, so that the heat dissipation efficiency of the motor is improved. The rapid response to the instant and greatly improved heat dissipation requirement of the motor can be ensured, so that the heat dissipation requirements of the eVTOL under all working conditions are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aircraft technology, in particular to an electric engine heat dissipation system, an electric engine, an electric propulsion device and an aircraft. BACKGROUND

[0002] With the increasingly serious road traffic congestion in large cities, the market demand for low-altitude transportation is becoming stronger and stronger. Due to the efficiency, punctuality and convenience of low-altitude travel, the future of low-altitude transportation will have a broad prospect. In the field of aircraft technology, electric vertical take-off and landing (eVTOL) is the current hot technology field, and with the unremitting efforts of researchers, the future can open up a new channel for low-altitude transportation.

[0003] The electric engine is a key component of eVTOL, and the driving motor (motor) therein is an important component for providing flight lift and thrust for eVTOL. Compared with ordinary motors, the driving motor has the characteristics of small size, light weight and high power. In particular, when a single motor or multiple motors fail, the normally working motor needs to significantly increase the power and work at peak power for a long time, thereby providing sufficient lift for eVTOL to ensure safe landing. However, the motor will generate a large amount of heat when working at peak power for a long time, and a high-performance electric engine heat dissipation system is needed to dissipate heat from the motor in time to ensure the normal operation of the motor.

[0004] However, the current single heat dissipation scheme cannot meet the heat dissipation needs of eVTOL in all working conditions. UTILITY MODEL CONTENT

[0005] The present application provides an electric engine heat dissipation system, an electric engine, an electric propulsion device and an aircraft to solve the problem that the electric engine heat dissipation system in the related art cannot meet the heat dissipation needs of eVTOL in all working conditions.

[0006] In a first aspect, the present application provides an electric engine heat dissipation system, comprising a motor cooling loop and a heat dissipation material arranged in the motor cooling loop, the heat dissipation material being used to assist the motor cooling loop in dissipating heat from the motor.

[0007] In a possible implementation, the heat dissipation material is attached to at least one of the following positions: the surface of the motor; the surface of the cooling pipeline in the motor cooling loop; and the surface of the heat sink in the motor cooling loop.

[0008] In a possible implementation, the heat dissipation material is attached to the corresponding position in the form of a patch.

[0009] In a possible implementation, the heat dissipation material is in the form of a flow channel and is connected in parallel to the motor cooling circuit.

[0010] In a possible implementation, the heat dissipation material is in the form of a flow channel and is at least arranged between the liquid pump and the radiator in the motor cooling circuit; and / or, the heat dissipation material is in the form of a flow channel and is at least arranged between the motor and the radiator in the motor cooling circuit.

[0011] In a possible implementation, the electric motor heat dissipation system further comprises a control switch; when the heat dissipation material is connected in parallel to the motor cooling circuit through the flow channel, the control switch is used to control the motor cooling liquid to pass through the heat dissipation material.

[0012] In a possible implementation, the control switch comprises at least one of a three-way valve, a solenoid valve, a ball valve, a butterfly valve, a stop valve, a plug valve, a flow divider, and a multi-channel valve.

[0013] In a possible implementation, the electric motor heat dissipation system further comprises a first temperature sensor for monitoring the temperature of the motor.

[0014] In a possible implementation, the heat dissipation material comprises a phase change heat dissipation material and / or an evaporation heat absorption material.

[0015] In a possible implementation, the electric motor heat dissipation system further comprises a second temperature sensor for monitoring the inlet liquid temperature of the heat dissipation material, a third temperature sensor for monitoring the outlet liquid temperature of the heat dissipation material, and a fourth temperature sensor for monitoring the temperature of the heat dissipation material.

[0016] In a second aspect, the present application provides an electric motor, comprising: the electric motor heat dissipation system of any one of the first aspect, wherein the electric motor heat dissipation system is arranged in a dual-redundancy manner.

[0017] In a third aspect, the present application provides an electric propulsion device, comprising: the electric motor of any one of the second aspect.

[0018] In a fourth aspect, the present application provides an aircraft, comprising: an aircraft body and the electric propulsion device of the third aspect.

[0019] The electric motor cooling system, the electric motor, the electric propulsion device and the aircraft provided by the application, wherein the electric motor cooling system comprises: a motor cooling loop, and a heat dissipation material arranged in the motor cooling loop, and the heat dissipation material is used for assisting the motor cooling loop in cooling the motor. By arranging the heat dissipation material in the motor cooling loop, the heat dissipation material is used for assisting the motor cooling loop in cooling the motor. Especially when the motor works in a high-power or high-temperature environment, the heat dissipation material can quickly absorb part of the heat, and the motor is cooled by the heat dissipation material and the radiator, so that the heat dissipation demand of the motor which is instantaneously greatly increased can be quickly responded, thereby meeting the heat dissipation demand of the eVTOL in all working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 A first structural schematic diagram of the electric motor cooling system provided by the exemplary embodiments of the application;

[0022] Figure 2 A second structural schematic diagram of the electric motor cooling system provided by the exemplary embodiments of the application;

[0023] Figure 3 A third structural schematic diagram of the electric motor cooling system provided by the exemplary embodiments of the application;

[0024] Figure 4 A fourth structural schematic diagram of the electric motor cooling system provided by the exemplary embodiments of the application.

[0025] Reference signs:

[0026] 10, electric motor cooling system; 11, cooling pipeline; 12, motor; 13, liquid pump; 14, radiator; 15, heat dissipation material; 16, fan; 17, control switch.

[0027] The specific embodiments of the application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to all alternative embodiments, as would be understood by persons skilled in the art. To the extent that they / it / its may do not apply to all embodiments, they / it / its will be so indicated. Those of ordinary skill in the art will realize that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, common, well-understood elements that are useful but not

[0029] The terms "first", "second", and the like, herein and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of such terms is merely for distinguishing between similar elements / objects and that no specific order is intended by using such terms. It is further understood that the data used herein can be interchanged, under appropriate circumstances, without departing from the scope of the embodiments described herein. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, as used herein, specify the presence of stated features, integers, steps, or components, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

[0030] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards, and provide corresponding operation portal for user to choose authorization or refusal.

[0031] At present, many high-power heat generating sports devices, such as drive motors of new energy vehicles and engines of fuel vehicles, will generate a large amount of heat during work, so they are usually arranged with a heat dissipation system (radiator and fan) to blow the airflow generated by the fan through the radiator to take away the heat generated by the sports device. The heat dissipation of the motor and engine of this type of vehicle is relatively spacious in structure arrangement and has no hard quality requirements. Therefore, in order to meet the heat dissipation requirements, the size of the radiator and the size of the fan will not be excessively developed, and the front end of the radiator will not be blocked by too many and too close objects. However, in order to meet the requirements of weight and arrangement space, the current eVTOL usually requires the designed product to be small and precise, and to ensure the performance. Therefore, the inlet end of the radiator will be blocked by the motor and the pump, which will inevitably cause new problems that do not occur in other industries, such as uneven distribution of inlet air, and even cause a large amount of heat backflow in the middle area of the radiator.

[0032] At present, the motor is usually cooled by air cooling or liquid cooling. When air cooling is used for heat dissipation, the heat generated inside the motor is taken away by air flow, which is usually suitable for motors with small power or low heat dissipation requirements. In high-power or high-temperature environments, the heat dissipation effect of air cooling is usually not good. When liquid cooling is used for heat dissipation, the heat generated inside the motor is taken away by liquid (such as water or coolant, etc.). However, in high-power or high-temperature environments, especially in extreme conditions such as single-point failure or multi-point failure, the heat dissipation effect of the electric motor cooling system with limited volume of liquid cooling is also usually not good. That is, a single air cooling or liquid cooling scheme cannot meet the heat dissipation requirements of eVTOL in all operating conditions.

[0033] To solve the above problems, the embodiment of the present application provides a motor cooling scheme. By setting a heat dissipation material in the motor cooling circuit of the electric motor cooling system, the heat dissipation material is used to assist the motor cooling circuit to cool the motor. In high-power or high-temperature environments, especially when the motor works in extreme conditions, the heat dissipation material quickly absorbs part of the heat, and cooperates with the radiator to cool the motor, ensuring that it can quickly respond to the instantaneous large increase in heat dissipation demand of the motor, thereby meeting the heat dissipation requirements of eVTOL in all operating conditions.

[0034] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0035] Figure 1 A first structure diagram of an electric motor cooling system provided by an exemplary embodiment of the present application is shown. The electric motor cooling system provided by the exemplary embodiment of the present application includes a motor cooling circuit and a heat dissipation material arranged in the motor cooling circuit, and the heat dissipation material is used to assist the motor cooling circuit to cool the motor. As shown in Figure 1 , the cooling pipeline 11, the motor 12, the liquid pump 13, the radiator 14 and the heat dissipation material 15 in the motor cooling circuit are connected in sequence.

[0036] The heat dissipation material is used to assist the motor cooling circuit to cool the motor, especially when the motor works in extreme conditions. For the setting position of the heat dissipation material in the motor cooling circuit, as shown in Figure 1 , the heat dissipation material 15 can be arranged between the liquid pump 13 and the radiator 14, and can be attached to the cooling pipeline 11, for example, the cooling pipeline between the liquid pump 13 and the radiator 14, or arranged at any other position in the motor cooling circuit. It should be noted that, Figure 1The setting position of the heat dissipation material 15 shown is only an example, and the embodiment of the present application does not limit the setting position of the heat dissipation material 15 in the motor cooling circuit. It should be noted that, Figure 1 The cooling pipeline 11 shown is only a schematic of the form of the cooling pipeline in the motor cooling circuit, and the embodiment of the present application does not limit the form of the cooling pipeline.

[0037] Correspondingly, the cooling pipeline 11 as a key component in the electric motor cooling system 10, its main role is to connect the motor 12, the liquid pump 13 and the radiator 14, form a closed circulation loop, for transmission of motor coolant, its material can choose high temperature and corrosion resistant materials, to ensure the reliability and durability in extreme conditions; the motor 12 is used to provide flight lift and thrust for eVTOL, which will generate a lot of heat in the working process, especially in extreme conditions, the motor 12 will generate a lot of heat when working at peak power for a long time, the motor 12 needs to be cooled in time to ensure the normal work of the motor 12; the liquid pump 13 is used to drive the motor coolant to circulate in the cooling pipeline 11, the selection of the liquid pump 13 should be based on the power and cooling demand of the motor 12 to select, to ensure that the motor coolant can circulate efficiently, so as to take away the heat generated by the motor 12; the radiator 14 as a core component in the electric motor cooling system 10, its main function is to dissipate the heat in the motor coolant to the environment, so as to reduce the temperature of the motor 12, when the motor 12 works in the low power working stage, it can basically meet the cooling demand of the motor 12 by relying on the radiator 14, when the motor 12 works in the extreme condition, only through the radiator 14 cannot meet the cooling demand of the motor 12, therefore, in order to improve the cooling efficiency in extreme conditions, the heat dissipation material 15 and the radiator 14 are combined to dissipate heat to the motor 12. It should be noted that the liquid pump 13 can be a water pump or other pumps that can be used to transport motor coolant.

[0038] The electric motor cooling system provided by the embodiments of the present application can quickly absorb part of the heat through the heat dissipation material when the motor works in the extreme working condition, and the heat dissipation material and the radiator cooperate to dissipate heat from the motor, so as to ensure that the heat dissipation demand of the motor can be quickly responded, thereby meeting the heat dissipation demand of the eVTOL in all working conditions. In addition, the size of the radiator and other devices in the motor cooling circuit can be reduced through the heat dissipation material, thereby reducing the overall weight and volume of the electric motor cooling system. Since the heat dissipation material stores heat in the material through heat conduction or convection, no additional cooling air or cooling liquid is needed, and when the heat dissipation demand of the motor increases, only the corresponding heat dissipation material needs to be increased, without the need to redesign the radiator and other devices, so that the design of the electric motor cooling system is more flexible and has better scalability.

[0039] In some embodiments, the heat dissipation material includes phase change heat dissipation material and / or evaporation heat absorption material.

[0040] The phase change heat dissipation material (PCM) is a material that can absorb or release a large amount of latent heat in the phase change process. Accordingly, when the motor generates a large amount of heat in the high-power working stage, the phase change heat dissipation material quickly absorbs heat through the phase change process (such as from solid to liquid), so as to quickly respond to the large increase in the heat dissipation demand of the motor; the evaporation heat absorption material absorbs heat through liquid evaporation, and when the heat generated by the motor causes the liquid in the evaporation heat absorption material to evaporate, the evaporation process will absorb a large amount of heat, thereby reducing the temperature of the motor.

[0041] For example, in an implementation, the heat dissipation material includes phase change heat dissipation material.

[0042] For example, only the phase change heat dissipation material is arranged in the motor cooling circuit, and when the motor works in the extreme working condition, the phase change heat dissipation material quickly absorbs heat through the phase change process (such as from solid to liquid).

[0043] In another implementation, the heat dissipation material includes evaporation heat absorption material.

[0044] For example, only the evaporation heat absorption material is arranged in the motor cooling circuit, and when the motor works in the extreme working condition, the evaporation heat absorption material quickly absorbs heat through liquid evaporation. In addition, when the evaporation heat absorption material is arranged in the motor cooling circuit, a corresponding evaporation pressure relief structure also needs to be arranged.

[0045] In yet another implementation, the heat dissipation material includes phase change heat dissipation material and evaporation heat absorption material.

[0046] Correspondingly, different heat dissipation materials can be applied to different components in the motor cooling loop, such as the phase change heat dissipation material for dissipating heat from the motor, the evaporation heat absorption material for dissipating heat from the radiator, and the like.

[0047] In addition, the heat dissipation material can also be arranged in a multi-layer structure, one layer being the phase change heat dissipation material and the other layer being the evaporation heat absorption material, or the phase change material and the evaporation material are mixed to form a composite material, the advantages of the two materials are combined together through material science technology to form a composite material with high heat management performance, and the like. It should be noted that when the heat dissipation material includes the phase change heat dissipation material and the evaporation heat absorption material, the evaporation pressure relief structure corresponding to the evaporation heat absorption material also needs to be arranged in the motor cooling loop. Correspondingly, when the motor works in the extreme working condition, the phase change heat dissipation material quickly absorbs heat through the phase change process (such as from solid to liquid), the evaporation heat absorption material quickly absorbs heat through liquid evaporation, and the motor is cooled through the cooperation of the phase change heat dissipation material and the evaporation heat absorption material, which can effectively meet the heat dissipation demand of the motor in the extreme working condition.

[0048] In some embodiments, the heat dissipation material is attached to at least one of the following positions: the surface of the motor; the surface of the cooling pipeline in the motor cooling loop; and the surface of the radiator in the motor cooling loop.

[0049] When the heat dissipation material is attached to the surface of the motor, the heat generated by the motor can be directly and effectively absorbed by the heat dissipation material, which is suitable for the case where the surface area of the motor is large; when the heat dissipation material is attached to the surface of the cooling pipeline in the motor cooling loop, the motor cooling liquid circulates in the cooling pipeline, and the heat generated by the motor can be conducted to the heat dissipation material through the pipeline wall in the extreme working condition, which can effectively utilize the circulation characteristics of the motor cooling liquid and is suitable for the case where the flow of the motor cooling liquid is large; when the heat dissipation material is attached to the surface of the radiator in the motor cooling loop, the heat generated by the motor can be conducted to the radiator through the motor cooling liquid, and part of the heat is first absorbed by the heat dissipation material in the extreme working condition to slow down the temperature rise of the radiator, and then the radiator further dissipates heat, which can directly and effectively absorb the heat conducted by the radiator and is suitable for the case where the surface area of the radiator is large.

[0050] For example, in an implementation, the heat dissipation material can be attached to any one of the surface of the motor, the surface of the cooling pipeline in the motor cooling loop, and the surface of the radiator in the motor cooling loop, and the like. For example, the heat dissipation material is only attached to the surface of the motor.

[0051] In another implementation, the heat dissipation material can be attached to multiple positions, such as the surface of the motor, the surface of the cooling pipeline in the motor cooling loop, and the surface of the heat sink in the motor cooling loop. For example, the heat dissipation material is attached to the heat dissipation surface of the motor and the surface of the cooling pipeline in the motor cooling loop.

[0052] In the embodiments of the present application, by attaching the heat dissipation material to different positions, the heat dissipation demand of the motor can be quickly responded to, thereby reducing the dependence on large heat sinks, and further reducing the overall weight and volume of the electric motor cooling system, which is of great significance to the design and performance optimization of eVTOL. In addition, the heat dissipation material can be flexibly arranged at different positions of the electric motor cooling system, further improving the flexibility of the design of the electric motor cooling system.

[0053] In some embodiments, the heat dissipation material is attached to the corresponding position in the form of a patch.

[0054] For example, Figure 2 A second structural schematic diagram of the electric motor cooling system is provided for the exemplary embodiments of the present application. As shown in Figure 2 The electric motor cooling system 10 further includes a fan 16 in the motor cooling loop, wherein the fan 16 is arranged on the side of the heat sink 14, and the heat dissipation material 15 is attached to the surface of the motor 12 and the surface of the cooling pipeline 11 in the form of a patch. For example, the phase change heat dissipation material is attached to the surface of the motor 12 and the surface of the cooling pipeline 11 in the form of a patch. When the temperature of the motor 12 rapidly rises in the extreme working condition, the phase change heat dissipation material attached to the surface of the motor 12 and the surface of the cooling pipeline 11 starts to absorb heat when the temperature of the motor reaches the phase change temperature of the phase change heat dissipation material (i.e. the temperature when it changes from solid to liquid), and then absorbs a part of the heat through the phase change heat dissipation material, and then dissipates the heat through the heat sink 14, thereby quickly responding to the rapid increase in the heat dissipation demand of the motor 12.

[0055] It should be noted that the timing of starting the heat absorption work of the heat dissipation material 15 can be controlled by selecting a phase change heat dissipation material with a phase change temperature matching the heat dissipation demand of the electric motor cooling system. For example, when the temperature of the motor 12 reaches 100℃, the heat dissipation material 15 needs to start heat absorption, and therefore a phase change heat dissipation material with a phase change temperature of 100℃ is selected. In addition, if the heat dissipation material 15 also uses evaporation heat absorption material, the evaporation heat absorption material can be selected according to the liquid evaporation temperature, which is similar to the selection of the phase change heat dissipation material, and will not be described here.

[0056] The heat dissipation material in the form of a patch can directly contact the surface of the motor or the cooling pipeline, etc., to ensure that the heat can be rapidly conducted into the heat dissipation material, thereby improving the heat dissipation efficiency. In addition, the heat dissipation material in the form of a patch is generally thin and light, and can also reduce the dependence on large heat sinks and high-power fans, thereby significantly reducing the overall weight and volume of the electric motor heat dissipation system, and the heat dissipation material in the form of a patch is easy to install and replace, can be flexibly arranged at different positions of the electric motor heat dissipation system according to specific needs, and is suitable for different motor designs and different working conditions, which is of great significance for the design and performance optimization of eVTOL.

[0057] In some embodiments, the heat dissipation material is in the form of a flow channel and is connected into the motor cooling loop.

[0058] For example, the phase change heat dissipation material and other heat conductive materials are processed into a flow channel form and directly connected into the motor cooling loop of the electric motor heat dissipation system. When the motor cooling liquid circulates in the flow channel, the heat is conducted to the phase change heat dissipation material through the motor cooling liquid, and after the phase change heat dissipation material absorbs part of the heat, the heat is further dissipated through the heat sink. The connection mode of the flow channel includes series connection and parallel connection.

[0059] In the embodiments of the present application, the heat dissipation material is connected into the motor cooling loop in the form of a flow channel, which can make full use of the circulation characteristics of the motor cooling liquid, ensure that the heat can be rapidly conducted to the heat dissipation material, and further improve the heat dissipation efficiency.

[0060] On the basis of the above-mentioned embodiments, in some embodiments, the heat dissipation material is in the form of a flow channel and is arranged at least between the liquid pump and the heat sink in the motor cooling loop.

[0061] For example, Figure 3 A third structural schematic diagram of the electric motor heat dissipation system provided by the exemplary embodiments of the present application is shown. As shown in the figure, Figure 3 The heat dissipation material 15 is arranged in the form of a flow channel between the liquid pump 13 and the heat sink 14 in the motor cooling loop. Correspondingly, when the motor 12 works in the extreme working condition, part of the heat is first rapidly absorbed by the heat dissipation material 15, and then dissipated by the heat sink 14. In the embodiments of the present application, part of the heat is first rapidly absorbed by the heat dissipation material, which can effectively reduce the temperature of the motor cooling liquid and avoid that the high heat load directly acts on the heat sink, thereby prolonging the service life of the heat sink.

[0062] In some embodiments, the heat dissipation material is in the form of a flow channel and is arranged at least between the motor and the heat sink in the motor cooling loop.

[0063] For example, still referring to Figure 3The heat dissipation material 15 is arranged in the form of a flow channel between the motor 12 and the radiator 14 in the motor cooling loop. Correspondingly, when the motor 12 works in the extreme working condition, the heat dissipation material 15 first absorbs a part of the heat, and then the radiator 14 further dissipates the heat, and then the heat dissipation material 15 further manages the remaining heat in a more refined manner.

[0064] In some embodiments, the heat dissipation material is arranged in the form of a flow channel at least between the liquid pump and the radiator in the motor cooling loop, and the heat dissipation material is arranged in the form of a flow channel at least between the motor and the radiator in the motor cooling loop.

[0065] For example, still referring to Figure 3 The heat dissipation material 15 is arranged in the form of a flow channel between the liquid pump 13 and the radiator 14 in the motor cooling loop, and the heat dissipation material 15 is arranged in the form of a flow channel between the motor 12 and the radiator 14 in the motor cooling loop. Correspondingly, when the motor 12 works in the extreme working condition, the heat dissipation material 15 first absorbs a part of the heat, and then the radiator 14 further dissipates the heat, and then the heat dissipation material 15 further manages the remaining heat in a more refined manner.

[0066] It should be noted that, Figure 3 The heat dissipation material 15 in the form of a flow channel is selected in the same way as in the above embodiments, which will not be described here.

[0067] In the embodiments of the present application, the heat dissipation material is arranged in the form of a flow channel in the motor cooling loop, so that the heat dissipation material can assist the motor cooling loop in dissipating heat from the motor. Especially when the motor works in the extreme working condition, the heat dissipation material and the radiator can be used for collaborative heat dissipation, so as to quickly respond to the instantaneous large increase in heat dissipation demand of the motor, and at the same time, reduce the dependence on large radiators and high-power fans, thereby significantly reducing the overall weight and volume of the electric motor cooling system.

[0068] In some embodiments, the electric motor cooling system further comprises a control switch; when the heat dissipation material is connected in parallel to the motor cooling loop through the flow channel, the control switch is used to control the motor cooling liquid to pass through the heat dissipation material.

[0069] For example, Figure 4 A fourth structural schematic diagram of the electric motor cooling system provided by the exemplary embodiments of the present application is shown. As Figure 4 As shown, the electric motor cooling system 10 further comprises a control switch 17, the flow channel in which the heat dissipation material 15 is arranged is connected in parallel to the motor cooling loop, and the control switch 17 is used to adjust the flow of the motor cooling liquid through the flow channel in which the heat dissipation material 15 is arranged.

[0070] Correspondingly, the control switch 17 is used to control the motor cooling liquid to dissipate heat through the heat dissipation material 15 to the motor 12 in the extreme working condition, and is used to control the motor cooling liquid not to dissipate heat through the heat dissipation material 15 but only through the radiator 14 to dissipate heat to the motor 12 in the normal working condition.

[0071] It should be noted that the three forms of attaching the heat dissipation material in the form of a patch to the corresponding position in the motor cooling circuit, connecting the heat dissipation material in the form of a flow channel into the motor cooling circuit, and setting the control switch in the motor cooling circuit can also be combined arbitrarily, for example, attaching the heat dissipation material in the form of a patch to the corresponding position in the motor cooling circuit and setting the control switch in the electric motor cooling system, and the like, and the combination form can be set flexibly according to actual design requirements, and the combination form is not limited herein.

[0072] In the embodiments of the present application, the control switch is set in the electric motor cooling system, so that the motor cooling liquid can be controlled to dissipate heat through the heat dissipation material in time when the motor works in the extreme working condition, additional heat dissipation capacity is provided, and the operation safety of the motor and the system is ensured. In addition, the control switch can be used to realize accurate management of the electric motor cooling system, ensure that the heat dissipation material plays the maximum effect when needed, and thus improve the heat dissipation efficiency.

[0073] In some embodiments, the control switch includes at least one of a three-way valve, a solenoid valve, a ball valve, a butterfly valve, a stop valve, a plug valve, a flow divider, and a multi-channel valve.

[0074] In an implementation manner, the control switch includes any one of a three-way valve, a solenoid valve, a ball valve, a butterfly valve, a stop valve, a plug valve, a flow divider, and a multi-channel valve. For example, the control switch is a three-way valve. When the motor works in the normal working condition, the three-way valve is connected to the path of the radiator to dissipate heat, and the motor cooling liquid is cooled through the radiator. When the motor works in the extreme working condition, the three-way valve is switched to the path of the flow channel formed by the heat dissipation material, the motor cooling liquid flows through the heat dissipation material, the heat dissipation material rapidly absorbs and dissipates heat, and then the motor cooling liquid is cooled through the radiator.

[0075] In another implementation manner, the control switch includes any combination of a three-way valve, a solenoid valve, a ball valve, a butterfly valve, a stop valve, a plug valve, a flow divider, and a multi-channel valve. For example, the control switch is a combination of a three-way valve and a solenoid valve. When the motor works in the normal working condition, the three-way valve and the solenoid valve are connected to the path of the radiator to dissipate heat, and the motor cooling liquid is cooled through the radiator. When the motor works in the extreme working condition, the three-way valve is connected to the path of the flow channel formed by the phase change heat dissipation material according to the actual heat dissipation requirement of the motor, and the solenoid valve is used to adjust the flow size of the flow channel formed by the phase change heat dissipation material as needed, so that unnecessary heat dissipation power consumption can be avoided, and the overall energy efficiency of the system is improved.

[0076] In some embodiments, the electric engine heat dissipation system further comprises a first temperature sensor for monitoring the temperature of the motor.

[0077] In one implementation, the first temperature sensor is installed on a component of the motor that generates heat easily, and the temperature change of the motor is monitored in real time by the first temperature sensor. When the temperature of the motor exceeds a preset threshold, the electric engine heat dissipation system triggers a heat dissipation mechanism, such as starting a heat dissipation fan, increasing the flow of motor coolant, or controlling a control switch to control the flow of motor coolant through the heat dissipation material, to prevent the motor from overheating.

[0078] In another implementation, the first temperature sensor is installed on the surface of the motor, and the temperature change of the motor is monitored in real time by the first temperature sensor. When the temperature of the motor exceeds a preset threshold, the electric engine heat dissipation system triggers a heat dissipation mechanism, such as starting a heat dissipation fan, increasing the flow of coolant, or controlling a control switch to control the flow of motor coolant through the heat dissipation material, to prevent the motor from overheating.

[0079] It should be noted that the installation position of the first temperature sensor in the embodiments of the present application is only an example, and the installation position of the first temperature sensor is not limited herein. In addition, the number of first temperature sensors can be multiple, and the number of first temperature sensors is not limited herein.

[0080] In the embodiments of the present application, the first temperature sensor can be used to accurately monitor the temperature of the motor, so as to accurately control the heat dissipation strategy of the motor, and thus meet the heat dissipation demand of the motor working in extreme conditions.

[0081] In some embodiments, the electric engine heat dissipation system further comprises a second temperature sensor for monitoring the inlet temperature of the heat dissipation material, a third temperature sensor for monitoring the outlet temperature of the heat dissipation material, and a fourth temperature sensor for monitoring the temperature of the heat dissipation material.

[0082] For example, the second temperature sensor is installed at the inlet of the flow channel of the heat dissipation material through which the motor coolant enters, for monitoring the inlet temperature of the motor coolant; the third temperature sensor is installed at the outlet of the flow channel of the heat dissipation material through which the motor coolant flows out, for monitoring the outlet temperature of the motor coolant; and the fourth temperature sensor is installed at the inlet position or outlet position of the flow channel of the heat dissipation material, for monitoring the real-time temperature of the heat dissipation material.

[0083] It should be noted that the number of the above-mentioned second temperature sensor, third temperature sensor and fourth temperature sensor can be multiple, and the number of the second temperature sensor, third temperature sensor and fourth temperature sensor is not limited herein.

[0084] Further, based on the inlet temperature and outlet temperature of the motor cooling liquid and the temperature of the heat dissipation material, the failure remaining time of the heat dissipation material is determined, and the flight control computer is used to issue relevant warnings and make subsequent relevant flight decisions according to the failure remaining time. For example, when the heat dissipation material is about to fail, measures such as reducing speed, reducing height, or landing in advance can be selected to ensure the safety of the eVTOL.

[0085] It should be noted that when the motor returns to the normal working state or the eVTOL lands on the ground, the heat dissipation material can release the heat absorbed in the extreme working condition through the heat sink or natural heat dissipation, so as to recover to the normal state and realize the recycling of the heat dissipation material.

[0086] The embodiments of the present application can accurately monitor the temperature changes of the motor cooling liquid in the entire heat dissipation process and the temperature changes of the heat dissipation material body through multiple temperature sensors, can timely obtain the working state and effect of the electric motor heat dissipation system, and predict the failure remaining time of the heat dissipation material based on the monitoring data. The failure remaining time can be used as the basis for flight decision, helping the pilot or the automatic control system of the eVTOL to make reasonable flight adjustment, thereby improving the safety and reliability of the overall system.

[0087] In summary, the present application has at least the following advantages:

[0088] I. By setting the heat dissipation material in the motor cooling circuit, the heat dissipation material is used to assist the motor cooling circuit to dissipate heat from the motor. Especially when the motor works in extreme working conditions, a part of the heat can be quickly absorbed by the heat dissipation material, which cooperates with the heat sink to dissipate heat from the motor, ensuring that the heat dissipation demand of the motor can be quickly responded, thereby meeting the heat dissipation demand of the eVTOL in all working conditions. In addition, by using the heat dissipation material to assist heat dissipation, the size of the heat sink and other devices in the motor cooling circuit can be reduced, thereby reducing the overall weight and volume of the electric motor heat dissipation system. Since the heat dissipation material stores heat in the material by heat conduction or convection, additional cooling air or cooling liquid is not needed. When the heat dissipation demand of the motor increases, the corresponding heat dissipation material can be added without the need to redesign the heat sink and other devices, thereby making the design of the electric motor heat dissipation system more flexible and having better scalability.

[0089] II. By attaching the heat dissipation material at different positions, the heat dissipation demand of the motor can be quickly responded, thereby reducing the dependence on large heat sinks, and further reducing the overall weight and volume of the electric motor heat dissipation system, which is of great significance to the design and performance optimization of the eVTOL. In addition, the heat dissipation material can be flexibly arranged at different parts of the electric motor heat dissipation system, further improving the flexibility of the design of the electric motor heat dissipation system.

[0090] III. By setting the control switch in the electric motor heat dissipation system, the motor can be cooled through the heat dissipation material in time when it works in extreme conditions, providing additional cooling capacity to ensure the safe operation of the motor and the system. In addition, the control switch can realize precise management of the electric motor heat dissipation system, ensuring that the heat dissipation material can play the maximum effect when needed, thereby improving the heat dissipation efficiency.

[0091] The application also provides an electric motor, comprising the electric motor heat dissipation system as described in the above embodiments.

[0092] The electric motor is a system composed of an electric motor, a motor controller, an electric motor heat dissipation system, a cable and its accessories, which can convert electrical energy into mechanical energy. In actual implementation, the electric motor can also be called an electric propulsion system.

[0093] The lift / thrust assembly is composed of an electric motor, a propeller and its accessories.

[0094] The embodiments of the application can prevent the electric motor and its components from overheating and reduce the damage of thermal stress to the material, thereby prolonging the service life of the electric motor.

[0095] In some embodiments, the electric motor heat dissipation system is provided with double redundancy.

[0096] For example, the electric motor includes double-redundancy backup master control boards and electric motor heat dissipation systems, each master control board is connected with a set of electric motor heat dissipation systems, so as to control the operation of the corresponding electric motor heat dissipation system through the corresponding master control board.

[0097] The embodiments of the application use double-redundancy backup master control boards and electric motor heat dissipation systems, so that when one master control board or electric motor heat dissipation system fails, the other set of master control board and electric motor heat dissipation system can still work normally, meeting the motor cooling demand in extreme conditions, thereby improving the reliability and safety of the system.

[0098] The application also provides an electric propulsion device, comprising the electric motor as described in the above embodiments.

[0099] The electric propulsion device is composed of a power battery, an electric motor, a propeller and its accessories. The propeller includes a variable-pitch propeller and a fixed-pitch propeller.

[0100] In addition, the application also provides an aircraft, comprising an aircraft body and an electric propulsion device as described in the above embodiments.

[0101] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0102] It is to be understood that the application is not limited to the precise construction herein described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be indicated by the appended claims, rather than the description.

Claims

1. An electric motor engine heat dissipation system, characterized by, The system comprises: a motor cooling loop, and a heat dissipation material arranged in the motor cooling loop, the heat dissipation material being used to assist the motor cooling loop in dissipating heat from a motor; wherein the heat dissipation material is arranged at at least one of the following positions: a surface of the motor; a surface of a cooling pipeline in the motor cooling loop; a surface of a radiator in the motor cooling loop.

2. The system of claim 1, wherein, The heat dissipation material is arranged in the form of a patch at the corresponding position.

3. The system of claim 1 or 2, wherein, The heat dissipation material is arranged in the form of a flow channel in the motor cooling loop.

4. The system of claim 3, wherein, The heat dissipation material is arranged in the form of a flow channel between at least one of the following: a liquid pump and a radiator in the motor cooling loop; 5. The system of claim 3, wherein, a motor and a radiator in the motor cooling loop. The system further comprises: a control switch; 6. The system of claim 5, wherein, when the heat dissipation material is arranged in the form of a flow channel and connected in parallel to the motor cooling loop, the control switch is used to control the motor cooling liquid to pass through the heat dissipation material.

7. The system of claim 1 or 2, wherein, The control switch comprises at least one of the following:

8. The system of claim 1 or 2, wherein, a three-way valve, an electromagnetic valve, a ball valve, a butterfly valve, a stop valve, a plug valve, a flow divider, and a multi-channel valve.

9. The system of claim 1 or 2, wherein, The system further comprises: a first temperature sensor for monitoring the temperature of the motor. The heat dissipation material comprises a phase change heat dissipation material and / or an evaporation heat absorption material. The system further comprises:

10. An electric motor characterized by a second temperature sensor for monitoring the inlet liquid temperature of the heat dissipation material; a third temperature sensor for monitoring the outlet liquid temperature of the heat dissipation material; 11. An electric propulsion device, characterized by and a fourth temperature sensor for monitoring the temperature of the heat dissipation material. The system comprises:

12. An aircraft, characterized in that the motor cooling system according to any one of claims 1 to 9, wherein the motor cooling system is provided with dual redundancy. The system comprises: the motor according to claim 10. The system comprises: an aircraft body and the electric propulsion device according to claim 11.

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