Cooling device, coil arrangement, electric machine and aircraft for use in alternating magnetic fields

Abstract

Cooling devices, coil arrangements, motors, and aircraft used in alternating magnetic fields. A cooling device for use in an alternating magnetic field may include: an evaporator portion defining a first volume for evaporating a cooling medium contained therein, said evaporator portion being made of a non-conductive and non-magnetic material; and a condenser portion defining a second volume for condensing said cooling medium contained therein, said condenser portion being fluidly connected to the first volume.

Description

Technical Field

[0001] The present invention relates to a cooling device for use in an alternating magnetic field; a coil arrangement for generating or receiving an alternating magnetic field, such as the stator of an electric motor; an electric motor, such as a motor; and an aircraft equipped with an electric motor.

[0002] Although applicable to any kind of device that generates alternating or temporarily changing magnetic fields, the invention and its corresponding potential problems will be explained in more detail in conjunction with motors, especially electric motors. Background Technology

[0003] Heat pipes are cooling devices that typically consist of an evaporator section and a condenser section interconnected by pipes, forming a separate, closed system. The cooling medium is contained within the heat pipe. In the evaporator section, the cooling medium absorbs heat from the structure to be cooled and evaporates. The evaporated gaseous cooling medium travels to the condenser section, where it condenses again.

[0004] Heat pipes enable high cooling rates within a limited volume at a nearly constant temperature. Typically, heat pipes are made of metallic materials that provide high thermal conductivity.

[0005] Many technological applications used to generate electromagnetic fields involve coils, but these coils generate heat due to losses. Therefore, cooling is needed to improve efficiency, such as in rotating electric motors.

[0006] WO 2017 / 076684 and US 2014 / 0368064 A1 each describe a rotor of an electric motor cooled by a heat pipe. Similar applications are described. US 4 240 000 A describes a heat pipe arranged in the rotor shaft of an electric motor rotor. Therefore, these documents use heat pipes in machine parts that rotate at the same or similar fundamental flux velocity. Thus, there is no or almost no velocity difference between the flux and the location of the heat pipe, resulting in no or very low inductance in the heat pipe. DE 102 58 778 A1 describes an electric motor having heat pipes disposed in slots between the rotor and stator.

[0007] In "Heat Pipe Cooling of Electrical Machines" (Naval Graduate School, Monterey, 1988, p. 557 and following pages), Giessler, Sattler, and Thoren describe the use of copper heat pipes at the bottom of the slots in the stator iron of an electric motor. Summary of the Invention

[0008] One of the objectives of this invention is to provide an improved solution for cooling structures subjected to magnetic fields.

[0009] According to a first aspect of the invention, a cooling device for use in an alternating magnetic field comprises: an evaporator portion defining a first volume for evaporating a cooling medium contained therein, said evaporator portion being made of a non-conductive and non-magnetic material; and a condenser portion defining a second volume for condensing said cooling medium contained therein, said condenser portion being fluidly connected to the first volume.

[0010] According to a second aspect of the invention, a coil arrangement for generating or receiving an alternating magnetic field includes: a carrier portion; a plurality of windings wound around the carrier portion; and a cooling device according to a first aspect of the invention. The evaporator portion of the cooling device is arranged to overlap with the windings; and the condenser portion is arranged to not overlap with or separate from the windings.

[0011] According to a third aspect of the invention, an electric motor (e.g., a motor) includes a stator comprising a coil arrangement according to a second aspect of the invention, wherein the stator defines an axis of rotation. The carrier portion may be formed, for example, a stator yoke, to which a plurality of windings are wound or applied. The motor further includes a rotor rotatably mounted relative to the stator about the axis of rotation.

[0012] According to a fourth aspect of the invention, an aircraft includes an electric motor according to a third aspect of the invention, for example, as a motor for driving a fan or thruster to generate thrust.

[0013] One idea of ​​the present invention is to provide a cooling device in the form of a heat pipe, the cooling device having an evaporator portion arranged in a high magnetic field region, for example directly adjacent to the windings of a coil that generates or receives a temporarily changing magnetic field, wherein the evaporator portion is made of a material that is electrically insulating (e.g., with a resistivity greater than or equal to 10). 7 The material is made of Ωcm and is non-magnetic or non-magnetizable. The condenser portion of the cooling device is arranged in a region where there is no magnetic field or only a magnetic field that is lower than the magnetic field present in the region where the evaporator portion is located. For example, the evaporator portion can be integrated into the stator of an electric motor or generator, while the condenser portion protrudes from the outside of the stator. Of course, other cooling applications are possible, such as in the coil arrangement of pulse generators in radar systems, in radio transmitting devices, and so on.

[0014] The advantage of making the evaporator section from a non-conductive and non-magnetic material is that the alternating magnetic field cannot induce a current within the evaporator section as would be the case with magnetic and / or conductive materials. Therefore, when located within a region of a temporarily changing magnetic field, the evaporator section itself is not heated by the magnetic field. This increases the amount of heat that can be received by the cooling medium of the cooling device for cooling purposes.

[0015] Another advantage is that the evaporator portion of the cooling device can be arranged to overlap with and / or be adjacent to the windings of the coil arrangement, for example, within the stator of a motor. This improves the cooling of the windings while advantageously reducing or even eliminating the influence of the magnetic field within the coil arrangement.

[0016] Because the evaporator section is non-conductive, it can be positioned very close to or even in direct contact with the windings, thereby further increasing cooling efficiency. Another advantage of using a non-conductive material for the evaporator section is that it prevents current from being conducted from the cooled coil arrangement to surrounding structures. This increases the operational safety and reliability of motors with this coil arrangement, which is particularly advantageous in aircraft applications.

[0017] According to some embodiments, the evaporator section can be made of ceramic material. Specifically, the evaporator section can be made of AlSiC material (e.g., AlSiC-9, AlSiC-10, or AlSiC-12). AlSiC material offers the benefits of a combination of high thermal conductivity and high resistivity, with the high thermal conductivity ranging from 180-200 W / m K and the high resistivity ranging from 10 W / m K. 8 Up to 10 9 Within the range of Ωcm.

[0018] According to some embodiments, the condenser section can be made of a metallic material (e.g., copper or aluminum). Since the condenser section is positioned in an area with no magnetic field or only a low magnetic field, magnetic and / or electrical conductors can be used without reducing the efficiency of the cooling device due to heating currents caused by alternating magnetic fields. Metallic materials offer the benefit of excellent thermal conductivity, and thus contribute to further increasing the efficiency of the cooling device.

[0019] According to some embodiments, the evaporator portion can be formed of a first tube including a first opening formed at an axial end of the first tube, and the condenser portion can include a second tube including a second opening formed at an axial end of the second tube, wherein the axial end of the second tube is introduced into the first opening of the first tube. Therefore, the evaporator portion and the condenser portion can be implemented as tubes, wherein the tube forming the condenser portion can be introduced into the opening of the tube forming the evaporator portion. The tube can be implemented not only as a straight, axially extending tube, but also as including curved or angled sections. By introducing the end of the second or condenser tube into the opening of the first or evaporator tube, a device with a simple construction is achieved, which can be easily assembled. In particular, when the condenser tube is made of a metallic material and when the evaporator tube is made of a ceramic material, improved sealing of the internal volume defined by the first volume of the evaporator portion and the second volume of the condenser portion can be achieved.

[0020] According to an exemplary embodiment, the first tube may include an inner surface defining a cross-section of a first volume, the inner surface being metallized in a region adjacent to the first opening, and the outer surface of the second tube may be joined to the metallized region of the inner surface of the first tube. That is, the inner diameter of the opening of the first tube may be coated with a metal layer, wherein the outer diameter at the end of the second tube may be integrally joined to the metal layer of the first tube. This achieves a connection between the evaporator tube and the condenser tube, which has high mechanical robustness and further improved fluid sealing performance.

[0021] According to some embodiments, non-conductive fibers can extend from a second volume defined by a second tube into a first volume defined by a first tube to transport condensed cooling medium from the condenser section to the evaporator section by capillary force. The fibers can be made of a non-conductive material. For example, the fibers can be glass fibers or aramid fibers. The fibers can extend through both the first and second tubes, particularly from an axial end of the first tube positioned opposite to the first opening to an axial end of the second tube positioned opposite to the second opening. The benefit of the fibers is that they can be easily introduced into the tubes, thus simplifying the assembly of the cooling device.

[0022] According to some embodiments, the inner surface of the cross-section defining a first volume of the first tube may include a plurality of first grooves extending toward a first opening, and the inner surface of the cross-section defining a second volume of the second tube may include a plurality of second grooves extending toward a second opening, wherein the first and second grooves are aligned with each other to convey the condensed cooling medium from the condenser section to the evaporator section by capillary force. Furthermore, or as an alternative to non-conductive fibers, grooves may be provided on the inner surface of the tubes. The first groove of the first tube may extend linearly from an axial end of the first tube positioned opposite to the first opening to the first opening. Similarly, the second groove of the second tube may extend linearly from an axial end of the second tube positioned opposite to the second opening to the second opening. Furthermore, the first and second tubes are positioned relative to each other such that at least some of the first and second grooves together form a continuous channel. It can be seen that one advantage of providing grooves is the reduction of the weight of the cooling device. A further advantage can arise from the fact that the grooves in the evaporator section are part of a solid non-conductive material, thereby providing minimal thermal resistance between the solid non-conductive material and the liquid in the grooves.

[0023] According to some embodiments of the coil arrangement, the evaporator section can be positioned between the carrier section and the windings. That is, the evaporator section can be sandwiched between the surface of the carrier section and the windings. One advantage of positioning the evaporator section directly between the carrier section and the windings is that the influence of the evaporator section on the magnetic field guidance can be further reduced.

[0024] According to some embodiments of the coil arrangement, the evaporator section can be arranged between two adjacent windings. This increases the heat transfer area. Simultaneously, the length of the heat conduction path from the height of the winding package to the evaporator section is reduced. Therefore, cooling efficiency is further improved.

[0025] According to some embodiments of the coil arrangement, the evaporator section can be arranged on the outermost winding away from the carrier section. This simplifies the installation of the cooling device.

[0026] According to some embodiments of the motor, the evaporator portion of the stator's cooling system extends along the axis of rotation, while the condenser portion protrudes from the axial end of the stator. This provides a space-saving arrangement of the cooling system, making the motor compact. Furthermore, heat can be efficiently transferred away from the stator along its entire length. Attached Figure Description

[0027] The invention will be explained in more detail with reference to the exemplary embodiments depicted in the accompanying drawings.

[0028] The accompanying drawings are included to provide a further understanding of the invention, and are incorporated into and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. Other embodiments of the invention and many anticipated advantages of the invention will be readily understood as they become apparent from the following detailed description. Elements in the drawings are not necessarily to scale relative to each other. Similar reference numerals denote corresponding similar parts.

[0029] Figure 1 A cross-sectional view of an electric motor according to an embodiment of the present invention is shown schematically.

[0030] Figure 2 schematically depicted Figure 1 The details of Z are shown, and the coil arrangement according to an embodiment of the present invention is illustrated.

[0031] Figure 3 A partial cross-sectional view of a motor according to an embodiment of the present invention is schematically shown, the cross-section being along... Figure 1 Cut off line AA in the middle.

[0032] Figure 4 The diagram schematically illustrates a partial cross-sectional view of a motor according to another embodiment of the invention, the cross-section being along... Figure 1 Cut off line AA in the middle.

[0033] Figure 5 The diagram schematically illustrates a partial cross-sectional view of a motor according to another embodiment of the invention, the cross-section being along... Figure 1 Cut off line AA in the middle.

[0034] Figure 6 An exploded cross-sectional view of a cooling device according to an embodiment of the present invention is shown schematically.

[0035] Figure 7 A cross-sectional view of a cooling device according to another embodiment of the present invention is shown schematically.

[0036] Figure 8 A cross-sectional view of a cooling device according to another embodiment of the present invention is shown schematically.

[0037] Figure 9 An aircraft according to an embodiment of the present invention is illustrated schematically.

[0038] In the accompanying drawings, similar reference numerals denote similar or functionally similar parts unless otherwise stated. Any directional terms, such as “top,” “bottom,” “left,” “right,” “above,” “below,” “horizontal,” “vertical,” “back,” “front,” and similar terms, are for illustrative purposes only and are not intended to define the embodiments as the specific arrangement shown in the drawings. Detailed Implementation

[0039] Although specific embodiments have been shown and described herein, those skilled in the art will understand that various alternative and / or equivalent implementations can be used instead of the specific embodiments shown and described without departing from the scope of the invention. Generally, this application is intended to cover any modifications or changes to the specific embodiments discussed herein.

[0040] Figure 1 A simplified cross-sectional view of the motor 100, particularly the electric motor, is shown. Figure 1 As schematically shown, the motor 100 may include a stator 110 and a rotor 120.

[0041] like Figure 1 As exemplarily shown, the stator 110 can be implemented as a generally cylindrical portion defining a central axis of rotation 105. The stator 110 may include a coil arrangement 10, the coils being arranged in… Figure 2 The diagram is shown in a simplified partial cross-sectional view and will be explained in more detail below.

[0042] The rotor 120 can be arranged, for example, inside the stator 110, such as... Figure 1 As exemplarily illustrated, this achieves an internal rotor topology. Alternatively, the rotor 120 can also be arranged around the stator 110 to achieve an external rotor topology. Typically, the rotor 120 can be rotatably mounted relative to the stator 110 about a rotation axis 105. Figures 3 to 5 As shown in a very simple and symbolic manner, rotor 120 may include magnetic devices 121, which may be permanent magnets or coils used as electromagnets. For example, the coil arrangement 10 of stator 110 may be configured to generate a rotating magnetic field so as to rotate rotor 120 about axis of rotation 105. Torque can then be supplied to output shaft 130 coupled to rotor 120. Motor 100 may also operate as a generator. In this case, rotor 120 with magnetic devices 121 rotates, thereby generating a rotating magnetic field that is received by coil arrangement 10 of stator 110.

[0043] Figure 9An aircraft 200 is illustrated as an example. The aircraft 200 may include a fuselage 210 defining the cabin of the aircraft 200, wings 220, stabilizers 230, 240, and an engine 250. The engine 250 may be attached to one of the wings 220, such as... Figure 9 As exemplarily shown, or another structure attached to aircraft 200. Figure 9 As schematically shown, engine 250 may in particular include electric motor 100 and a propeller or fan 251 driven by electric motor 100.

[0044] Now for reference Figure 2 The coil arrangement 10 may include a carrier portion 11, a plurality of windings 12, and a cooling device 1. The carrier portion 11 may, for example, be the stator yoke of the stator 110 of the motor 100. However, the invention is not limited to the motor 100, and the coil arrangement 10 can be used in other applications where a temporarily changing magnetic field will be generated. The carrier portion 11 is only used in… Figure 2 The diagram is schematically shown. When used as a stator yoke, the carrier portion 11 may include a yoke ring 11A and teeth 11B that project radially inward from the yoke ring for an internal rotor topology, such as... Figures 3 to 5 This is schematically illustrated. In the external rotor topology, tooth 11B can project radially outward from the yoke ring. Ring 11B surrounds the rotation axis 105, and tooth 11B can extend along the rotation axis 105.

[0045] Winding 12 is a typical coil winding, and is wound only on... Figure 2 The carrier portion 11 is schematically shown in the diagram. For example, multiple layers of windings 12 may be arranged on top of each other.

[0046] Cooling device 1 Figure 2 The cooling device 1 is schematically shown and may include an evaporator section 2, a condenser section 3, and optional cooling fins or ribs 4. Figures 6 to 8 This is shown in further detail.

[0047] like Figure 2 and Figures 6 to 8 As exemplarily shown, the evaporator section 2 can be implemented as a first tube 20, which will also be referred to below as evaporator tube 20. Evaporator tube 20 can, for example, be implemented as a linear or straight-extending tube or channel, such as... Figure 2 and Figures 6 to 8The diagram is schematically shown. However, it is also possible that the evaporator tube includes curved and / or angled sections. Typically, the evaporator tube 20 extends between a first axial direction or front end 21 and an opposite second axial direction or rear end 22, where a first opening 23 may be provided, and an end wall 24 may be provided at the second axial direction or rear end. The evaporator tube 20 includes an inner surface 20a that defines the internal cross-sectional shape of the evaporator tube 20, such as a circular cross-section, etc. Figures 3 to 5 The rectangular cross section shown is an example, or another cross section that defines a closed perimeter. Figure 2 The evaporator tube 20 shown and Figures 6 to 8 The evaporator tubes 20 shown each include a constant inner diameter defined by an inner surface 20a between a first axial end 21 and a second axial end 22. However, other configurations are of course possible. Typically, the evaporator tubes 20 define a first volume V2.

[0048] like Figure 6 As best seen, the inner diameter of the evaporator tube 20 may optionally widen at the first opening 23. For example, in region 21A extending from the first axial end 21, the inner surface 20a may define an inner diameter larger than that defined by the inner surface 20a in the remainder of the tube 20. Optionally, the inner surface 20a may include a metallic coating within said region 21A.

[0049] The evaporator section 2, regardless of its shape, can be made of a non-conductive material that is neither magnetic nor magnetizable. In other words, the evaporator section 2 can be a magnetic and electrical isolator. In particular, the evaporator section 2 can be made of a ceramic material (e.g., AlSiC material, such as AlSiC-9, AlSiC-10, or AlSiC-12).

[0050] like Figure 2 and Figures 6 to 8 As exemplarily shown, the condenser section 3 can be implemented as a second tube 30, which will also be referred to below as condenser tube 30. Similar to evaporator tube 20, the second tube 30 can be implemented, for example, as a linear or straight-extending tube or channel, such as... Figure 2 and Figures 6 to 8 The diagram is schematically shown. However, it is also possible that the second tube 30 includes curved and / or angled sections. Typically, the condenser tube 30 extends between a first axial direction or front end 31 and an opposite second axial direction or rear end 32, where a second opening 33 may be provided, and an end wall 34 may be provided at the second axial direction or rear end. The condenser tube 30 includes an inner surface 30a that defines the internal cross-sectional shape of the condenser tube 30, such as a circular cross-section, a rectangular cross-section, or another cross-section defining a closed perimeter. Figure 2 The condenser tube 30 shown is Figures 6 to 8The condenser tubes 30 shown each include a constant inner diameter defined by an inner surface 30a between a first axial end 31 and a second axial end 32. However, other configurations are, of course, possible. Typically, the condenser tubes 30 define a second volume V3.

[0051] The condenser section 3, regardless of its shape, can be made of any material that provides good heat transfer performance. Optionally, the condenser tubes 30 can be made of a metallic material (such as aluminum or copper).

[0052] Typically, a first volume V1 defined by the evaporator section 2 and a second volume V3 defined by the condenser section 3 are connected to each other for fluid communication. Therefore, a cooling medium (e.g., water or an organic phase change cooling medium) can be contained within the first volume V2 and the second volume V3. For structural cooling, the liquid cooling medium absorbs heat, evaporates in the evaporator section 2, and is transported to the condenser section 3 (where it condenses). The condenser section 3 thereby dissipates heat to the surroundings, and the condensed liquid cooling medium is transported back to the evaporator section 2. To further facilitate heat dissipation from the condenser section 3, optional cooling fins 4 can be attached to the outer surface 30a of the condenser section 3, such as... Figure 2 As exemplarily illustrated. For example, multiple parallel cooling fins 4 may extend radially outward from the outer surface 30a of the condenser tube 30, such as... Figure 2 The diagram is shown schematically. Alternatively, heat removal from the condenser section 3 can be achieved via coolant supplied to the condenser section 3.

[0053] like Figure 2 and Figures 6 to 8 As exemplarily shown, the evaporator section 2 and the condenser section 3 can be directly connected to each other. Typically, the first axial end 21 of the evaporator tube 20 can be joined to the first axial end 31 of the condenser tube 30, so that the first volume V2 of the evaporator tube 20 and the second volume V3 of the condenser tube 30 are in fluid communication via the first opening 21 of the evaporator tube 20 and the second opening 31 of the condenser tube 30. However, it is also possible to provide an intermediate section (not shown) between the first tube 20 and the second tube 30 to connect the first opening 21 and the second opening 31 to each other in a fluid conduction manner.

[0054] like Figures 6 to 8 As schematically shown, the first axial end 31 of the second tube 30 can extend into the first opening 23 of the first tube 20 and is fixed within the first opening of the first tube. Figure 6Symbolically indicated by arrow P, the first axial end 31 of the second or condenser tube 30 can be introduced into the first opening 23 of the first or evaporator tube 20, particularly into a widened or enlarged region 21A optionally located near the first axial end 21 of the evaporator tube 20. Specifically, the wall thickness of the condenser tube 30 and the diameter of the enlarged region 21A of the evaporator tube 20 can be determined such that the inner surface 20a of the evaporator tube 20 and the inner surface of the condenser tube 30 are flush with each other. The wall thickness of the condenser tube 30 can be measured between the inner surface 30a and the opposite outer surface 30b of the condenser tube 30. To secure the first axial end 31 of the second tube 30 within the first opening 23 of the first tube 20, an optional metallized portion in region 21A of the inner surface 20a of the first tube 20 and the outer surface 30a of the second tube 30 can be joined, for example, integrally joined, particularly by applying heat to the metallized portion and the first axial end 31 of the second tube 30.

[0055] like Figure 7 As exemplarily illustrated, the cooling device 1 may optionally include non-conductive fibers F, such as glass fibers. The fibers F are disposed within a first volume V2 and a second volume V3 defined by the evaporator section 2 and the condenser section 3. Specifically, the non-conductive fibers F extend from the second volume V3 into the first volume V3. Figure 7 As exemplarily shown, fiber F can extend from the second axial or rear end 22 of the first or evaporator tube 20 all the way to the second axial or rear end 32 of the second or condenser tube 3. Fiber F can fill a considerable portion of the first volume V2 and the second volume V3, for example, between 20% and 80% of the first volume V2 and the second volume V3. Fiber F facilitates the transport of condensed cooling medium from the condenser section 3 back to the evaporator section 2 by capillary force.

[0056] Alternatively, or as an alternative to fiber F, grooves 25 and 35 can be provided on the inner surface 20a of the first tube 20 and the inner surface 30a of the second tube 30 to facilitate the capillary transport of the condensing cooling medium from the condenser section 3 to the evaporator section 2. Figure 8 As exemplarily shown, the inner surface 20a of the first tube 20 may include a plurality of first grooves 25, and the inner surface 30a of the second tube 30 may include a plurality of second grooves 35. This is merely an example. Figure 8Three parallel first grooves 25 and three parallel second grooves 35 are shown. Typically, any number of first grooves 25 and any number of second grooves 35 can be arranged around the entire inner circumference of the first tube 20. Typically, the first grooves 25 can extend towards the first opening 23. For example, the first grooves 25 can extend from the rear end 22 to the front end 21 of the first tube 20. Similarly, the second grooves 35 can extend towards the second opening 33. For example, the second grooves 35 can extend from the rear end 32 to the front end 31 of the second tube 30. Figure 8 As schematically shown, the first groove 25 and the second groove 35, in particular at least some of the first groove 25 and the second groove 35 are aligned with each other. Thus, at least some of the first groove 25 and the second groove 35 are open to each other, thereby forming a continuous channel for conveying the condensed cooling medium by means of capillary force.

[0057] When the cooling device 1 described above is used to cool the winding 12 of the coil arrangement 10, as shown above... Figure 2 As exemplarily shown, the evaporator section 2 is arranged to overlap with the windings 12. Specifically, the evaporator section 2 may be arranged adjacent to or in direct contact with the windings 12. (See from...) Figure 1 and Figure 2 It can be further seen that the evaporator section 2 can be arranged such that it extends along the axis of rotation 105. Since the evaporator section 2 is made of a non-magnetic and non-conductive material, it is advantageous to prevent current from being induced into the evaporator section due to the alternating magnetic field generated by the winding 12.

[0058] Figure 2 and Figure 3 An evaporator portion 2, arranged or sandwiched between the carrier portion 11 and the winding 12, is shown as an example. Specifically, Figure 3 The carrier portion 11 of the stator yoke, which is implemented as an electric motor 100, is shown, wherein the evaporator portion 2 is arranged at the bottom of the gap between two adjacent teeth 11B.

[0059] Figure 4 An alternative location where the evaporator section 2 overlaps with the winding 12 is shown as an example. Figure 4 As schematically shown, the evaporator section 2 can be arranged between two adjacent windings 12 or layers of winding 12. Alternatively, the evaporator section 2 can also be arranged on the outermost winding 12B or the outermost layer of the winding, which is arranged facing away from the carrier section 11, such as... Figure 5 As illustrated in the example. Figure 4 and Figure 5 Also shown is an evaporator section 2, which is arranged in the gap between two adjacent teeth 11B of the stator yoke that forms the carrier section 11.

[0060] When the evaporator section 2 is arranged to overlap with the windings 12 and thus extend into the region subjected to the alternating magnetic field, the condenser section 3 is arranged to not overlap with the windings 12 or to be separate from these windings, such as... Figure 1 and Figure 2 As exemplarily shown in the example. Therefore, the condenser section 3 is arranged in a region where there is no alternating magnetic field or only a weak alternating magnetic field. For example, in the motor 100 including the coil arrangement 10, for example Figure 1 In the electric motor shown, the condenser portion 3 can protrude from the axial end 112 of the stator 110, for example, along the rotation axis 105, as shown. Figure 1 As illustrated in the example.

[0061] In the foregoing detailed description, various features have been combined in one or more examples for the purpose of simplifying this disclosure. It should be understood that the above description is intended to be illustrative and not restrictive. It is intended to cover all alternatives, modifications, and equivalents. Many other examples will be apparent to those skilled in the art upon reading the foregoing specification.

[0062] The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to best utilize the invention and various embodiments with various modifications suitable for the intended particular use. Throughout the appended claims and the specification, the terms “comprising” and “therein” are used as the simple English equivalents of the respective terms “including” and “wherein”. Furthermore, “a” or “an” does not exclude a plurality in this application.

[0063] List of reference numerals

[0064] 1. Cooling device

[0065] 2. Evaporator Section

[0066] 3. Condenser Section

[0067] 4 Cooling ribs

[0068] 10. Coil Arrangement

[0069] 11. Carrier Section

[0070] 12 windings

[0071] 12B outermost winding

[0072] 20 First tube

[0073] 20a Inner surface of the first tube

[0074] 21 First axial / front end of the first tube

[0075] 21A Metallized Region

[0076] 23 First Opening

[0077] 24 end wall

[0078] 25 First Groove

[0079] 30 Second tube

[0080] 30a Inner surface of the second tube

[0081] 30b Outer surface of the second tube

[0082] 31 The first axial / front end of the second tube

[0083] 33 Second opening

[0084] 34 end wall

[0085] 35 Second Groove

[0086] 100 motor

[0087] 105 Rotation axis

[0088] 110 stator

[0089] 112 Axial end of stator

[0090] 120 rotor

[0091] 121 Magnetic Device

[0092] 130 Output Shaft

[0093] 200 aircraft

[0094] 210 fuselage

[0095] 220 Wing

[0096] 230 and 240 stabilizers

[0097] 250 engine

[0098] 251 Fan

[0099] F fiber

[0100] P arrow

[0101] V2 First Volume

[0102] V3 Second Volume

Claims

1. A cooling device (1) for use in an alternating magnetic field, the cooling device comprising: An evaporator section (2), defining a first volume (V2), for evaporating a cooling medium contained therein, said evaporator section (2) being made of a non-conductive and non-magnetic material; and A condenser section (3) defines a second volume (V3) for condensing the cooling medium contained therein, the condenser section (3) being fluidly connected to the first volume (V2), and The evaporator section (2) is formed by a first tube (20) having a first opening (23) at its axial end (21), and the condenser section (3) includes a second tube (30) having a second opening (33) at its axial end (31), wherein the axial end (31) of the second tube (30) is introduced into the first opening (23) of the first tube (20); and The inner surface (20a) of the first tube (20) defining the first volume (V2) is metallized in a region (21A) adjacent to the first opening (23), and the outer surface (30b) of the second tube (30) is joined to the metallized region (21A).

2. The cooling device (1) according to claim 1, wherein, The evaporator section (2) is made of ceramic material.

3. The cooling device (1) according to claim 2, wherein, The evaporator section (2) is made of AlSiC material.

4. The cooling device (1) according to any one of the preceding claims, wherein, The condenser section (3) is made of metal.

5. The cooling device (1) according to claim 4, wherein, The condenser section (3) is made of copper or aluminum.

6. The cooling device (1) according to claim 1, wherein, Non-conductive fiber (F) extends from the second volume (V3) defined by the second tube (30) into the first volume (V2) defined by the first tube (20) to transport the condensed cooling medium from the condenser section (3) to the evaporator section (2) by capillary force.

7. The cooling device (1) according to claim 1 or 6, wherein, The inner surface (20a) of the first tube (20) defining the first volume (V2) includes a plurality of first grooves (25) extending toward the first opening (23), wherein the inner surface (30a) of the second tube (30) defining the second volume (V3) includes a plurality of second grooves (35) extending toward the second opening (33), and wherein the first grooves (25) and the second grooves (35) are aligned with each other to transport the condensed cooling medium from the condenser section (3) to the evaporator section (2) by capillary force.

8. A coil arrangement (10) for generating or receiving an alternating magnetic field, the coil arrangement comprising: Carrier part (11); Multiple windings (12) are wound around the carrier portion (11); as well as Cooling device (1) according to any one of the preceding claims; The evaporator section (2) is arranged to overlap with the winding (12); and The condenser section (3) is arranged to be separate from the winding (12).

9. The coil arrangement (10) according to claim 8, wherein, The evaporator section (2) is arranged between the carrier section (11) and the winding (12).

10. The coil arrangement (10) according to claim 8, wherein, The evaporator section (2) is arranged between two adjacent windings (12).

11. The coil arrangement (10) according to claim 8, wherein, The evaporator section (2) is arranged on the outermost winding (12B) opposite to the carrier section (11).

12. An electric motor (100), comprising: A stator (110) comprising the coil arrangement (10) according to any one of claims 8 to 11, the stator (110) defining a rotation axis (105); and The rotor (120) is rotatably mounted relative to the stator (110) around the axis of rotation (105).

13. The motor (100) according to claim 12, wherein, The evaporator portion (2) of the cooling device (1) of the stator (110) extends along the axis of rotation (105), and the condenser portion (3) protrudes from the axial end (112) of the stator (110).

14. An aircraft comprising an electric motor (100) according to claim 12 or 13.

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