Systems and methods for cooling electric aircraft

Abstract

To provide systems and methods for cooling an electric aircraft.SOLUTION: A system comprises an electronic device, a casing, at least one fin, and at least one PHP. The electronic device can generate heat. The electronic device can be housed in the casing. The fin can be attached to the outer wall of the casing. The PHP can be embedded in the fin, such that the evaporator section of the PHP is closest to a heat source and the condenser section of the PHP is furthest from the heat source. The PHP can also be placed within the casing. In some embodiments, the casing can have a plurality of slots. The fin can be shaped such that a single fin may slide into a pair of slots and come to rest adjacent to the casing, where the PHP can be embedded in the fin.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to systems and methods for cooling electric aircraft. [Background technology]

[0002] Electric aircraft rely on electric motors to generate lift and / or thrust. Electric aircraft also use various other electronic devices to control the electric motors and other aircraft functions. These electronic devices may be packaged together in a casing. These electronic devices may generate significant heat that requires cooling to keep the electronics within their optimal operating temperature range. Traditional cooling systems may involve the use of cooling fins or the casing itself, among other types of cooling devices. Traditional cooling systems may result in poor heat spreading capability around the packaging faces of the electronics, which may result in less cooling effectiveness and less electronic functionality. Summary of the Invention

[0003] Electronic devices generate heat during operation. The more demanding the conditions under which electronic devices operate, the more heat they generate. To operate effectively, electronic devices should be maintained within an ideal operating temperature range. Therefore, electronic devices should be actively or passively cooled. Often, electronic devices are surrounded by a protective casing, which may help prevent damage to the electronic device, but may also trap more heat generated by the electronic device. The casing may utilize a cooling system to attempt to cool the electronic device.

[0004] Conventional cooling systems may involve the use of cooling fins located on the outside of the casing or the casing itself to spread heat. The fins or casing are typically located in the air stream, and the large surface area of ​​the fins or casing allows the heat to dissipate. However, conventional cooling systems may result in poor heat spreading along the fins or casing, where most of the heat remains in the portion of the fin or casing closest to the heat source. This results in an inefficient use of the fins and casing, as the entire surface area of ​​the fins and casing is not used for cooling. This effect is particularly relevant for electric aircraft, where the motors providing lift or thrust may generate a significant amount of heat due to the high power demands on the electronic devices of the inverter circuits required to power the electric aircraft. An electric aircraft may be, for example, an electric vertical take-off and landing (eVTOL). Thus, there is a need for a cooling system with increased cooling capacity in the same amount of space to accommodate the cooling demands of an electric aircraft.

[0005] The disclosed embodiments provide a more efficient cooling system than conventional fins by utilizing a self-oscillating heat pipe (PHP) in conjunction with cooling fins and / or a casing. The PHP may also be referred to as an oscillating heat pipe (OHP). The PHP comprises a channel having an evaporator section and a condenser section. A refrigerant is disposed within the channel. The refrigerant may change between gas and liquid phases and move between the evaporator section and the condenser section. Such changes may absorb and release heat, resulting in heat being absorbed from the electronic device and released to the airflow at the end of the fin away from the casing. This may provide advantages of higher heat transfer capacity, spreading of high heat flux, ability to withstand g-forces experienced by aircraft, orientation-independent performance, and simplicity of construction.

[0006] The embodiments generally include a casing including a casing interior cavity, at least one electronic device, at least one cooling fin attached to the casing, and at least one PHP embedded within at least one of the casing interior cavity or the cooling fin. A portion of the PHP closest to the heat generating electronic device may function as an evaporator section of the PHP. A portion of the PHP furthest from the heat generating electronic device may function as a condenser section of the PHP. In some embodiments, the system includes a casing having a plurality of slots, at least one cooling fin segment, the at least one fin segment including a U-shaped cross section, the fin segment insertable into the plurality of slots of the casing. In another embodiment, the system is utilized in an eVTOL.

[0007] In one embodiment, an electric motor assembly includes a motor housing having an end face, a motor within the motor housing, and an electronics assembly disposed on the motor housing end face, the electronics assembly includes a casing having an interior cavity and an exterior surface, and at least one electronic device disposed inside the interior cavity, the casing having at least one fin protruding from the casing exterior surface, the fin having a fin interior cavity and one or more self-oscillating heat pipes disposed within the casing interior cavity, the fin interior cavity, or both the casing interior cavity and the fin interior cavity of the one or more fins.

[0008] In another embodiment, an electric motor assembly includes a motor housing having an end face, a motor within the motor housing, and an electronics assembly disposed on the motor housing end face, the electronics assembly includes a casing having an internal cavity and at least one electronic device disposed inside the internal cavity, a casing exterior surface includes a plurality of slots and one or more fin segments including a first fin, a second fin, and a connection connecting the first fin to the second fin, the first fin and the second fin are inserted into the plurality of slots such that the first fin and the second fin protrude from an exterior surface of the casing, the first fin and the second fin each include a fin internal cavity and one or more self-oscillating heat pipes disposed within the fin internal cavities of the first fin and the second fin.

[0009] In yet another embodiment, an electric vertical take-off and landing (eVTOL) vehicle includes an electric motor assembly including a motor housing having an end face, a motor within the motor housing, and an electronics assembly disposed on the motor housing end face, the electronics assembly including a casing having an interior cavity and an exterior surface, and at least one electronics device disposed inside the interior cavity, the casing having at least one fin protruding from the casing exterior surface, the fin having a fin interior cavity and one or more self-oscillating heat pipes disposed within the casing interior cavity, the fin interior cavity, or both the casing interior cavity and the fin interior cavity of the one or more fins.

[0010] Additional features and advantages of the techniques described in this disclosure will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description, or will be learned by practicing the techniques as described in this disclosure, including the following detailed description, the claims, and the accompanying drawings. [Brief description of the drawings]

[0011] The following detailed description of the disclosure can be better understood when read in conjunction with the following drawings.

[0012] [Figure 1] FIG. 2 is a schematic depiction of a front cross-sectional view of a motor, a casing, a number of fins, and a propeller assembly according to one or more embodiments shown and described herein. [Diagram 2] FIG. 2A is a schematic depiction of a top view of a motor, casing, and fin assembly according to one or more embodiments shown and described herein. [Diagram 3] FIG. 2 is a schematic depiction of a PHP disposed within a cooling fin according to one or more embodiments shown and described herein. [Figure 4] FIG. 2 is a schematic depiction of a PHP disposed within a casing interior cavity according to one or more embodiments shown and described herein. [Diagram 5] FIG. 2A is a schematic depiction of a top view of a motor, casing, and fin segments according to one or more embodiments shown and described herein. [Figure 6] FIG. 2 is a schematic depiction of a casing including a plurality of slots according to one or more embodiments shown and described herein. [Figure 7A] FIG. 13 is a schematic depiction of a fin segment that is insertable into multiple slots of a casing according to one or more embodiments shown and described herein. [Figure 7B] FIG. 13 is a schematic depiction of a fin segment inserted into two of a plurality of slots of a casing according to one or more embodiments shown and described herein. [Figure 8] FIG. 1 is a schematic depiction of an eVTOL having a cooling system according to one or more embodiments shown and described herein.

[0013] Reference will now be made in more detail to various embodiments of the present disclosure, some embodiments of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Embodiments of the present disclosure are directed to cooling systems employing PHPs for electric motors and vehicles, e.g., eVTOLs. In embodiments, the PHPs are integrated into the casing interior cavity, or within the width of the cooling fins attached to the casing, to increase the heat spreading efficiency of the casing or cooling fins. The portion of the PHP closest to the heat source acts as an evaporator. The portion of the PHP furthest from the heat source and located within the airflow of the electronic aircraft acts as a condenser. This arrangement allows for more uniform heat spreading throughout the casing or fins, which in turn allows for greater cooling capacity to remove heat from the electronic device.

[0015] The PHP has a complete loop such that the internal contents can pass from the evaporator section through the condenser section, back to the evaporator section, etc. In some embodiments, the PHP can be arranged in a serpentine fashion such that a single PHP can include multiple condenser sections and multiple evaporator sections all within a single PHP. In some embodiments, multiple condenser sections and multiple evaporator sections can all be incorporated within a single cooling fin.

[0016] In some embodiments, a single PHP may be disposed within the casing interior cavity. In some embodiments, multiple PHPs may be disposed within the casing interior cavity.

[0017] In some embodiments, the casing may have multiple cooling fins arranged about the periphery of the casing. In some embodiments, a single PHP may be arranged such that a single PHP is embedded within the multiple cooling fins. In some embodiments, there may be multiple PHPs such that each of the multiple cooling fins may have a single PHP embedded within each cooling fin.

[0018] In some embodiments, there may be multiple slots disposed around the casing. One or more fin segments may be formed with a U-shape in top view, so that a single fin segment fits within two slots. In this arrangement, a single PHP may be incorporated within each U-shaped fin segment.

[0019] The term "evaporator" refers to the part of the PHP where a liquid is changed from a liquid to a gas, absorbing heat. The term "condenser" refers to the part of the PHP where a gas is changed from a gas to a liquid, releasing heat.

[0020] Conventional cooling systems may limit heat spread and concentrate heat in the portions of the casing or fins closest to the heat source. This does not efficiently use the full area of ​​the casing or fins as the heat does not dissipate throughout the casing or fins, and also removes less heat from the heat source that the casing or fins are designed to cool. Embodiments of the present disclosure may more effectively transfer heat throughout the casing or fins, more efficiently use the full area of ​​the casing or fins, and increase the spread of heat throughout the casing or fins compared to conventional cooling systems. Embodiments may also dissipate more heat from the heat source compared to conventional cooling systems.

[0021] 1, an exemplary system 100 is shown. The system 100 includes a casing 110, a motor 101, one or more electronic devices 113, a propeller 102, and a propeller shaft 103. The electronic device 113 is disposed within a casing interior cavity 111 (i.e., an enclosure defined by the casing 110). A number of fins 120 are attached to a casing exterior surface 118. The propeller shaft 103 is connected to the motor 101 and the propeller 102. The casing 110 may have a passage 117 to allow the propeller shaft 103 to pass from the motor 101 to the propeller 102. The propeller 102 may provide lift, thrust, or a combination of lift and thrust. It should be noted that while six fins 120 are shown in this embodiment, the system 100 may include any number of fins 120. It should be understood that the arrangement of components for the system of FIG. 1 is for illustration purposes and that other arrangements are possible.

[0022] The electronic device 113 in the casing interior cavity 111 can be one or more different electronic devices 113. The electronic device 113 can be included in an inverter circuit, a gate drive, and / or the like. The electronic device 113 can include a capacitor, an insulated gate bipolar transistor, a power MOSFET, or any other electronic device. The electronic device 113 can be a heat source for the system 100, and the electronic device 113 generates heat during operation.

[0023] The casing 110 surrounding the electronic device 113 can be any number of shapes, including but not limited to a cylinder, a toroid, or a rectangular prism. The casing 110 can be made of any number of materials, including but not limited to aluminum. The casing 110 includes at least one wall and an interior cavity. In some embodiments, there can be multiple casings 110 arranged together, with each casing 110 having at least one fin 120 attached thereto.

[0024] The system may include a fin 120. The system may include multiple fins 120. The fin 120 may be attached to the casing 110. The fin 120 may be attached to the casing 110 by a variety of methods, including but not limited to soldering, brazing, and welding. In some embodiments, the fin 120 and the casing 110 may be made from a single piece of material. The fin 120 may be any number of shapes, including but not limited to a cylinder or a rectangular prism.

[0025] 2, a top view of an embodiment of system 100 is shown. A number of fins 120 are shown protruding from casing exterior surface 118. Passageways 117 are shown. Casing interior surface 115 is also shown. Electronic device 113 is shown disposed adjacent casing interior surface 115 near casing perimeter 114. Section plane AA is shown.

[0026] 3, a top view of a section of an embodiment of the system 100 including a PHP 130 embedded within the fin 120 is shown. The electronic device 113 is disposed within the casing interior cavity 111. The fin 120 includes a fin interior cavity 121. The PHP 130 is disposed within the fin interior cavity 121. The PHP 130 includes channels, with alternating vapor plugs and liquid slugs of refrigerant disposed within the channels. Any known or undeveloped refrigerant may be used. As a non-limiting example, R404A may be used as the refrigerant. In some embodiments, the PHP 130 includes a single circuit for refrigerant inside a single fin 120 such that the portion of the PHP 130 closest to the heat source may function as the PHP evaporator section 131 and the portion of the PHP furthest from the heat source may function as the PHP condenser section 132. In another embodiment not shown, the PHP 130 includes multiple circuits for refrigerant inside the fins 120 such that the PHP 130 includes a single closed loop, and in the single PHP 130, there are multiple PHP evaporator sections 131 closest to the heat source and multiple PHP condenser sections 132 furthest from the heat source.

[0027] 4, a front view of a section cut along section line AA of FIG. 2 is shown. In some embodiments, the PHP 130 includes a single circuit for refrigerant inside the casing internal cavity 111 such that the portion of the PHP 130 closest to the heat source can function as the PHP evaporator section 131 and the portion of the PHP furthest from the heat source can function as the PHP condenser section 132. In another embodiment, the PHP 130 includes multiple circuits for refrigerant inside the casing internal cavity 111 such that the PHP 130 includes a single closed loop, and in a single PHP 130, there are multiple PHP evaporator sections 131 closest to the heat source and multiple PHP condenser sections 132 furthest from the heat source.

[0028] It should be understood that in some embodiments, the fins 120 may be attached to the casing 110 by being attached to the casing exterior surface 118, although in other embodiments, the fins 120 may be attached to the casing 110 in other ways. In other embodiments, the fin segments 225 may be attached to the casing 210 through a number of slots in the casing 210.

[0029] 5, a top view of another embodiment of the system 100 is shown. A plurality of segments 225 are shown inserted through a plurality of slots 216 in the casing 210. The plurality of slots 216 may be disposed axially around the casing 210. A passageway 217 is shown. The casing inner surface 215 is also shown. An electronic device 213 is shown disposed adjacent the casing inner surface 215 near the casing perimeter 214. A cut line plane BB is shown.

[0030] 6, there is shown a front view of a section taken along section line BB of an embodiment of a casing 210 having a plurality of slots 216. The slots 216 may be arranged in any configuration around the circumference of the casing 210. The slots 216 may be any number of shapes, including, but not limited to, rectangular or circular. The slots may be arranged in pairs.

[0031] 7A and 7B, another embodiment of the fins 220A, 220B and casing 210 is shown. In this embodiment, the two fins 220A, 220B are provided by a single fin segment 225. The fin segment 225 is U-shaped having three portions, a first portion defining a first fin 220A and a second portion defining a second fin 220A that is parallel to the first fin 220A. The fin segment 225 further comprises a third portion defining a connection 224 connecting the first fin 220A and the second fin 220B.

[0032] 7B depicts fins 220A, 220B being inserted into slots 216 of casing 210. Each fin 220A, 220B protrudes from casing 210. Connections 224 press against an inner surface of casing 210 and may further contact one or more electronic devices. Fin segments 225 may mechanically engage with casing 210 by fasteners (not shown), soldering, brazing, adhesives, or any joining technique.

[0033] Each fin segment 225 includes a single built-in PHP 230 as described above. In such an embodiment, the condenser section of the PHP 130 resides in the fins 220A, 220B, while the evaporator section of the PHP 230 resides at the interface 224. The electronic device heats the PHP 230 at the interface 224, while air passing by the fins 220A, 220B cools the PHP 230.

[0034] The multiple fin segments 225 may be disposed around the entire circumference of the casing 210 or a portion thereof. The system may include a number of PHPs 230 equal to the number of fins 220. This may allow a user to select the exact number of fin segments 225 and PHPs 230 customized for any situation. For example, if the system 200 is to operate in an environment having a high ambient temperature, additional fin segments 225 may be provided. In an environment having a lower ambient temperature, fewer fin segments 225 may be provided.

[0035] 8, the system 100 is shown in an eVTOL 140. Multiple motors 101 connected to multiple propellers 102 by multiple propeller shafts 103 may be used. The eVTOL 140 may use lift from the multiple propellers 102 to take off and land vertically. The multiple propellers 102 may also provide thrust so that the eVTOL 140 may move forward. Airflow from the propellers 102 may also provide airflow to the fins 120 of the system 100. In an alternative embodiment, airflow from the propellers 102 may also provide airflow to the fin segments 225. The airflow may enable the PHP condenser section 132 to condense a refrigerant inside each PHP 130, which may cool the electronic device 113.

[0036] The system 100 may enable improved cooling of the electronic device 113 in an electric aircraft, including an eVTOL 140. The system 100 may include a PHP integrated in one or more fins 120. The system 100 may be further configured by a user selecting a desired number of fin segments 225 to achieve a desired amount of cooling capacity of the system 100. The fins 120 and fin segments 225 may be positioned in the airflow of the multiple propellers 102 such that the airflow may further cool the PHP condenser section 132 integrated in the fins 120 and fin segments 225. The PHP 130 may enable more efficient heat transfer across the fins 120 or fin segments 225. This more efficient heat transfer may remove more heat from the electronic device 113, which may enable the electronic device 113 to operate more efficiently.

[0037] It may be noted that one or more of the following claims utilize the terms "where," "wherein," or "in which" as transitional phrases. For purposes of defining the present technology, it may be noted that these terms are introduced in the claims as open-ended transitional phrases used to introduce a description of a series of features of a structure, and are to be interpreted in a similar manner to the more commonly used open-ended preamble term "comprising."

[0038] It should be understood that any two quantitative values ​​assigned to a property may constitute a range for that property, and all combinations of ranges formed from all recited quantitative values ​​for a given property are contemplated in this disclosure.

[0039] Although the subject matter of the present disclosure has been described in detail by referring to certain embodiments, it may be noted that various details described in the present disclosure should not be considered as implying that the details relate to elements that are essential components of the various embodiments described in the present disclosure, even if a particular element may be shown in each of the drawings accompanying this specification. Rather, the claims attached hereto should be considered as the only representation of the breadth of the present disclosure and the corresponding scope of the various embodiments described in the present disclosure. Moreover, it will be apparent that modifications and variations are possible without departing from the scope of the appended claims.

[0040] Example 1. An electric motor assembly comprising: a motor housing having an end surface; a motor within the motor housing; an electronics assembly disposed on the end surface of the motor housing; the electronics assembly comprising: a casing having an interior cavity and an exterior surface, said casing defining an enclosure; at least one electronic device within the enclosure; one or more fins protruding from the exterior surface of the casing, the one or more fins comprising a fin interior cavity; (1) the casing internal cavity, (2) the fin internal cavity, and (3) one or more oscillating heat pipes disposed within at least one of both the casing internal cavity and the fin internal cavity of the one or more fins; An electric motor assembly comprising: Example 2. An electric motor assembly as described in Example 1, wherein the casing internal cavity is connected to the fin internal cavity of the one or more fins, and the one or more self-oscillating heat pipes are disposed within both the casing internal cavity and the fin internal cavity of the one or more fins. Example 3. The electric motor assembly of example 1, wherein the casing interior cavity is an evaporator for the one or more self-oscillating heat pipes and the fin interior cavity is a condenser for the one or more self-oscillating heat pipes. Example 4. The electric motor assembly of example 1, wherein a portion of the fin interior cavity closest to the casing is an evaporator and a portion of the fin interior cavity furthest from the casing is a condenser. Example 5. The electric motor assembly of Example 1, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by an inner surface of the casing. Example 6. The electric motor assembly of example 5, wherein the at least one electronic device contacts the inner surface of the casing. Example 7. A propeller shaft connected to the motor and passing through an opening in the casing; a propeller connected to the propeller shaft, rotation of the propeller causing air to pass by the one or more fins; and 2. The electric motor assembly of example 1, further comprising: Example 8. The electric motor assembly of example 1, wherein the self-oscillating heat pipe has multiple condenser sections and multiple evaporator sections within a single fin. Example 9. An electric motor assembly comprising: a motor housing having an end surface; a motor within the motor housing; an electronics assembly disposed on the end surface of the motor housing; the electronics assembly comprising: a casing having an internal cavity and an exterior surface, the exterior surface comprising a plurality of slots, the casing defining an enclosure; at least one electronic device within the enclosure; one or more fin segments comprising a first fin, a second fin, and a connector connecting the first fin to the second fin, the first fin and the second fin being inserted into the plurality of slots such that the first fin and the second fin protrude from the outer surface of the casing, the first fin and the second fin each comprising a fin interior cavity; one or more oscillating heat pipes disposed within the fin interior cavities of the first fin and the second fin; An electric motor assembly comprising: Example 10. An electric motor assembly as described in Example 9, wherein the connection of the one or more fin segments is an evaporator section of the self-oscillating heat pipe, and the fin interior cavity of the first fin and the second fin is a condenser section of the self-oscillating heat pipe. Example 11. An electric motor assembly as described in Example 9, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by an inner surface of the casing, and the one or more fin segments comprise a plurality of fin segments. Example 12. An electric motor assembly as described in Example 11, wherein the at least one electronic device contacts the connecting portions of the plurality of fin segments. Example 13. A propeller shaft connected to the motor and passing through an opening in the casing; a propeller connected to the propeller shaft, rotation of the propeller causing air to pass by the first fin and the second fin of the one or more fin segments; and 10. The electric motor assembly of example 9, further comprising: Example 14. The electric motor assembly of example 9, wherein the self-oscillating heat pipe has multiple condenser sections and multiple evaporator sections within a single fin. Example 15. An electric vertical take-off and landing aircraft (eVTOL) having an electric motor assembly, The electric motor assembly includes: a motor housing having an end surface; a motor within the motor housing; an electronics assembly disposed on the end surface of the motor housing; the electronics assembly comprising: a casing having an interior cavity and an exterior surface, said casing defining an enclosure; at least one electronic device within the enclosure; one or more fins protruding from the exterior surface of the casing, the one or more fins comprising a fin interior cavity; (1) the casing internal cavity, (2) the fin internal cavity, and (3) one or more oscillating heat pipes disposed in at least one of both the casing internal cavity and the fin internal cavity of the one or more fins; Equipped with an eVTOL. Example 16. The eVTOL of Example 15, wherein the casing internal cavity is connected to the fin internal cavity of the one or more fins, and the one or more self-oscillating heat pipes are disposed within both the casing internal cavity and the fin internal cavity of the one or more fins. Example 17. The eVTOL of Example 15, wherein the casing internal cavity is an evaporator for the one or more self-oscillating heat pipes and the fin internal cavity is a condenser for the one or more self-oscillating heat pipes. Example 18. The eVTOL of example 15, wherein a portion of the fin interior cavity closest to the casing is an evaporator and a portion of the fin interior cavity furthest from the casing is a condenser. Example 19. The eVTOL of Example 15, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by an inner surface of the casing. Example 20: A propeller shaft connected to the motor and passing through an opening in the casing; a propeller connected to the propeller shaft, rotation of the propeller causing air to pass by the one or more fins; and The eVTOL of example 15, further comprising:

Claims

1. An electric motor assembly, A motor housing having an end face, The motor inside the motor housing, An electronic equipment assembly disposed on the end face of the motor housing, The electronic equipment assembly comprises, A casing comprising an internal cavity and an external surface, wherein the casing defines an enclosure, The enclosure contains at least one electronic device, One or more fins protruding from the outer surface of the casing, wherein the one or more fins have an internal cavity, One or more self-excited oscillating heat pipes are disposed inside both the casing's internal cavity and the fin's internal cavity of one or more fins, An electric motor assembly comprising:

2. The electric motor assembly according to claim 1, wherein the casing internal cavity is connected to the fin internal cavity of one or more fins, and the one or more self-excited oscillating heat pipes are located inside both the casing internal cavity and the fin internal cavity of one or more fins.

3. The electric motor assembly according to claim 1, wherein the cavity inside the casing is an evaporator relating to one or more self-excited oscillating heat pipes, and the cavity inside the fins is a condenser relating to one or more self-excited oscillating heat pipes.

4. The electric motor assembly according to claim 1, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by the inner surface of the casing.

5. The electric motor assembly according to claim 4, wherein the at least one electronic device is in contact with the inner surface of the casing.

6. A propeller shaft connected to the motor and passing through the opening of the casing, A propeller connected to the propeller shaft, wherein the rotation of the propeller causes air to pass beside one or more fins, The electric motor assembly according to claim 1, further comprising:

7. The electric motor assembly according to claim 1, wherein the self-excited oscillating heat pipe has a plurality of condenser sections and a plurality of evaporator sections within a single fin.

8. An electric motor assembly, A motor housing having an end face, The motor inside the motor housing, An electronic equipment assembly disposed on the end face of the motor housing, The electronic equipment assembly comprises, A casing comprising an internal cavity and an external surface, wherein the external surface comprises a plurality of slots, and the casing defines the enclosure, The enclosure contains at least one electronic device, One or more fin segments comprising a first fin, a second fin, and a connecting portion for connecting the first fin to the second fin, wherein the first fin and the second fin are inserted into a plurality of slots such that the first fin and the second fin protrude from the outer surface of the casing, and each of the first fin and the second fin comprises an internal fin cavity, One or more self-excited oscillating heat pipes disposed within the fin-internal cavities of the first fin and the second fin, An electric motor assembly comprising:

9. The electric motor assembly according to claim 8, wherein the connection portion of one or more fin segments is the evaporator section of the self-excited oscillating heat pipe, and the fin internal cavities of the first fin and the second fin are the condenser section of the self-excited oscillating heat pipe.

10. The electric motor assembly according to claim 8, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by the inner surface of the casing, and the one or more fin segments comprises a plurality of fin segments.

11. The electric motor assembly according to claim 10, wherein the at least one electronic device is in contact with the connection portion of the plurality of fin segments.

12. A propeller shaft connected to the motor and passing through the opening of the casing, A propeller connected to the propeller shaft, wherein the rotation of the propeller causes air to pass beside the first fin and the second fin of one or more fin segments, The electric motor assembly according to claim 8, further comprising:

13. The electric motor assembly according to claim 8, wherein the self-oscillating heat pipe has a plurality of condenser sections and a plurality of evaporator sections within a single fin.

14. An electric vertical take-off and landing aircraft (eVTOL) comprising an electric motor assembly, The aforementioned electric motor assembly is A motor housing having an end face, The motor inside the motor housing, An electronic equipment assembly disposed on the end face of the motor housing, The electronic equipment assembly comprises, A casing comprising an internal cavity and an external surface, wherein the casing defines an enclosure, The enclosure contains at least one electronic device, One or more fins protruding from the outer surface of the casing, wherein the one or more fins have an internal cavity, One or more self-excited oscillating heat pipes are disposed inside both the casing's internal cavity and the fin's internal cavity of one or more fins, An eVTOL equipped with this feature.

15. The eVTOL according to claim 14, wherein the casing internal cavity is connected to the fin internal cavity of one or more fins, and the one or more self-excited oscillating heat pipes are located inside both the casing internal cavity and the fin internal cavity of one or more fins.

16. The eVTOL according to claim 14, wherein the cavity inside the casing is an evaporator relating to one or more self-excited vibrating heat pipes, and the cavity inside the fin is a condenser relating to one or more self-excited vibrating heat pipes.

17. The eVTOL according to claim 14, wherein the at least one electronic device comprises a plurality of electronic devices positioned along a perimeter defined by the inner surface of the casing.

18. A propeller shaft connected to the motor and passing through the opening of the casing, A propeller connected to the propeller shaft, wherein the rotation of the propeller causes air to pass beside one or more fins, The eVTOL according to claim 14, further comprising the above.

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