Power plant for an aircraft and aircraft

Abstract

The application relates to the technical field of aircrafts, in particular to a power device for an aircraft and the aircraft. The power device for the aircraft provided by the application comprises a first motor and at least two second motors; the first motor is an outer rotor motor, the inside of the stator of the first motor has a hollow space; the at least two second motors are sequentially connected along an axial direction, and the at least two second motors are arranged in the hollow space. The power device for the aircraft can be used by the aircraft. The power device for the aircraft provided by the application has high integration degree, simple and compact overall structure, high stability, good heat dissipation effect and is convenient to install. When the power device is used by the aircraft, the power device has the functions of rotor driving, total pitch adjustment and cyclic pitch adjustment, is beneficial to the optimization of the overall structure of the aircraft and is especially suitable for the use of the variable-pitch propeller aircraft.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aircraft technology, in particular to a power device for an aircraft and the aircraft. BACKGROUND

[0002] In the related art, the power device of a variable-pitch propeller aircraft can realize rotation of a propeller, total pitch adjustment and cyclical pitch adjustment. The power device generally includes one motor and three steering gears. In this scheme, the propeller is driven by the motor to realize rotation of the propeller, and the propeller is driven by the three steering gears to realize total pitch adjustment and cyclical pitch adjustment. The disadvantages of this scheme are:

[0003] The steering gears are composed of a motor and a reduction system, for example, a direct current motor and a reduction gear set. Therefore, the motor and the three steering gears need to be independently arranged, which occupies a large space, resulting in a complex overall structure of the power device, low integration level and inconvenience for installation.

[0004] Therefore, it is necessary to optimize the structure of the power device.

[0005] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is already known to those skilled in the art. SUMMARY

[0006] The present application provides a power device for an aircraft and the aircraft, which can effectively solve the above or other potential technical problems.

[0007] The first aspect of the present application is to provide a power device for an aircraft, which includes a first motor and at least two second motors; the first motor is an outer rotor motor, the inside of the stator of the first motor has a hollow space; the at least two second motors are connected in sequence along the axial direction, and the at least two second motors are arranged in the hollow space.

[0008] The power device for an aircraft provided by the embodiments of the present application includes a first motor and at least two second motors; the first motor is an outer rotor motor, the inside of the stator of the first motor has a hollow space; the at least two second motors are connected in sequence along the axial direction, and the at least two second motors are arranged in the hollow space. The stator of the first motor is internally provided with a hollow space, which can accommodate the at least two second motors. In the hollow space, the at least two second motors are connected in sequence along the axial direction, further reducing the occupation of space. The power device for an aircraft provided by the present application realizes integration of the first motor and the second motor, has high integration level and simple and compact overall structure.

[0009] In an optional embodiment according to the first aspect, the first motor comprises a first motor stator, a first motor outer rotor and a first motor support sleeve; the first motor outer rotor comprises a first motor rotor shell, at least two weeks of first motor permanent magnet poles are arranged in the first motor rotor shell; the first motor stator is arranged in pairs corresponding to the first motor permanent magnet poles; the first motor stator comprises a first motor stator shaft sleeve, the first motor stator shaft sleeve is a hollow shaft sleeve, a first motor stator coil is arranged on the outer periphery of the first motor stator shaft sleeve; adjacent first motor stator shaft sleeves are fixedly connected, the internal cavities of each first motor stator shaft sleeve are communicated to form the hollow space; the first motor support sleeve is arranged in the hollow space, and each first motor stator shaft sleeve is fixedly connected with the first motor support sleeve.

[0010] In this way, the first motor can provide greater torque, the number of first motor stators is at least two, and the number of first motor permanent magnet poles is at least two weeks. In the event of single-stator failure or single-permanent-magnet-pole failure, the first motor can still work normally, and has better safety redundancy.

[0011] In an optional embodiment according to the first aspect, a top end of the first motor rotor shell is provided with a first motor upper end cover, a lower end of the first motor rotor shell is provided with a cooling fan which rotates synchronously with the first motor rotor shell; a first motor tapered roller bearing is arranged between the first motor upper end cover and the first motor support sleeve; a lower end of the first motor stator shaft sleeve located at the bottom end is provided with a first motor lower end cover; the first motor rotor shell, the first motor upper end cover, the first motor lower end cover and the first motor stator shaft sleeve are respectively provided with ventilation holes, and the ventilation holes are communicated to form an axial air duct.

[0012] In this way, the structural sealing of the first motor is ensured, the first motor upper end cover rotates stably, the cooling fan drives the airflow to flow, and the first motor and the second motor are cooled and radiated, thereby effectively preventing the first motor and the second motor from being damaged by high temperature during long-term operation.

[0013] In an optional embodiment according to the first aspect, the first motor upper end cover has a bowl-shaped structure, an upper bowl opening and a lower bowl opening are respectively sealingly connected with the first motor support sleeve, and the first motor upper end cover and the first motor support sleeve form a sealed space; the first motor tapered roller bearing is arranged in the sealed space; a self-lubricating cooling system is arranged in the sealed space.

[0014] In this way, the self-lubricating cooling system lubricates and cools the first motor tapered roller bearing, the first motor and the second motor, which is conducive to ensuring the stability of the rotation of the movable parts and ensuring good overall heat dissipation performance.

[0015] In an optional embodiment according to the first aspect, the self-lubricating cooling system comprises a vortex cover, an oil guide disc, an impeller and an oil cavity; the vortex cover is sealingly connected to the upper bowl mouth of the first motor upper end cover, and the vortex cover is in dynamic sealing connection with the first motor support sleeve; the oil guide disc is arranged above the first motor tapered roller bearing, and the oil guide disc is fixedly sleeved on the first motor support sleeve; the impeller is arranged below the first motor tapered roller bearing, and the impeller is sleeved on the first motor support sleeve and fixedly connected with the first motor upper end cover; the first motor support sleeve and the first motor stator shaft sleeve are internally provided with a circulating oil passage, the circulating oil passage is communicated to form an oil cavity, the oil outlet and the oil return port of the oil cavity are both arranged on the first motor support sleeve, and the oil outlet is located at the position of the impeller and the oil return port is located at the position of the oil guide disc.

[0016] In this way, the first motor outer rotor drives the first motor upper end cover and the impeller to rotate synchronously, lubricating oil is thrown to the edge of the impeller under the action of centrifugal force, a pressure difference is formed, the stable circulation of lubricating oil in the self-lubricating cooling system is ensured, the first motor tapered roller bearing is fully lubricated, and the wear of the first motor tapered roller bearing is reduced; the circulating lubricating oil can also take out the heat generated by the rotation of the motor and the bearing in the form of heat conduction, so as to achieve the effect of heat dissipation, prolong the service life of the power device, and reduce the maintenance cost of the aircraft.

[0017] In an optional embodiment according to the first aspect, the second motor is an outer rotor motor, comprising a second motor stator, a second motor outer rotor and a second motor rotating shaft sleeve; the second motor outer rotor comprises a second motor rotor shell, the second motor rotor shell is internally provided with a second motor permanent magnet pole, and the top end of the second motor rotor shell is provided with a second motor end cover; the second motor stator comprises a second motor stator shaft sleeve, the second motor stator shaft sleeve is a hollow sleeve, and the outer periphery of the second motor stator shaft sleeve is provided with a second motor stator coil; the internal cavity of the second motor stator shaft sleeve is used for accommodating the second motor rotating shaft sleeve; the second motor end cover is fixedly connected with the second motor rotating shaft sleeve.

[0018] In this way, the second motor rotor shell can drive the second motor end cover and the second motor rotating shaft sleeve to rotate synchronously, so as to ensure the stability and synchronism of the motor operation.

[0019] In an optional embodiment according to the first aspect, the second motor rotating shaft sleeve has a threaded inner hole for connecting with a screw rod.

[0020] In this way, the second motor rotating shaft sleeve can be used as a power output shaft, and is screwed with a screw rod to drive the components in other mechanisms to work in a screw transmission mode, and the other mechanisms can be an automatic tilting device.

[0021] In an optional embodiment according to the first aspect, the second motor stators of each of the second motors are fixedly connected through a connecting plate.

[0022] In this way, the coaxiality of the second motors is ensured, and the fixation is stable and reliable.

[0023] In an optional embodiment according to the first aspect, the first motor and the second motor located at the bottom end are fixedly connected through bolts.

[0024] In this way, the reliable fixation between the first motor and the second motor is ensured, and the disassembly and maintenance are facilitated.

[0025] The second aspect of the present application also provides an aircraft comprising the power device for aircraft.

[0026] The power device for aircraft and the aircraft provided by the present application have the following advantages. The power device for aircraft adopts an integrated design, specifically, at least two second motors are integrated inside the first motor, and the at least two second motors are sequentially connected along an axial direction. The power device has a high degree of integration, a simple and compact overall structure, high stability, and good heat dissipation effect, is convenient to install, and has the functions of rotor driving, total pitch adjustment, and cyclic pitch adjustment when used for an aircraft, which is beneficial to the optimization of the overall structure of the aircraft, and is especially suitable for use in a variable-pitch propeller aircraft.

[0027] The advantages of the additional aspects of the present application will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and other objects, features and advantages of the embodiments of the present application will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. In the drawings, various embodiments of the present application are illustrated by way of example and not limitation in which:

[0029] Figure 1 a cross-sectional view of the power device for aircraft provided by the embodiments of the present application;

[0030] Figure 2 a cross-sectional view of the first motor provided by the embodiments of the present application;

[0031] Figure 3 an assembly structure schematic view of the second motor provided by the embodiments of the present application;

[0032] Figure 4 a cross-sectional view of the Figure 3

[0033] Figure 5 ​A cross-sectional view of the self-lubricating cooling system provided by the embodiment of the present application;

[0034] Figure 6 A cross-sectional view of the oil cavity provided by the embodiment of the present application;

[0035] Figure 7 An assembly position diagram of the connecting plate provided by the embodiment of the present application.

[0036] Explanation of reference signs:

[0037] 1, first motor; 2, second motor; 3, self-lubricating cooling system; 4, cooling fan; 110, first motor outer rotor; 111, first motor rotor shell; 112, first motor permanent magnet magnetic pole; 120, first motor stator; 121, first motor stator shaft sleeve; 122, first motor stator coil; 130, first motor upper end cover; 140, first motor support sleeve; 150, first motor lower end cover; 170, first motor Hall inductor; 180, first motor tapered roller bearing; 190, first motor hub; 210, second motor outer rotor; 211, second motor rotor shell; 212, second motor permanent magnet magnetic pole; 213, second motor end cover; 214, second motor rotating shaft sleeve; 220, second motor stator; 221, second motor stator shaft sleeve; 222, second motor stator coil; 230, connecting plate; 240, second motor electronic governor; 250, second motor Hall inductor; 260, second motor magnetic disk; 310, impeller; 320, volute; 330, oil guide disc; 340, oil cavity; 341, circulating oil path; 342, oil outlet; 343, oil return port. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0040] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any meaning pertaining to the quantity of the features implied. Thus, a feature defined with "first", "second", etc. can include at least one of the features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0043] At present, the power device of the aircraft in the related art usually adopts a scheme of a single motor plus three rudders, in which the rotation of the propeller is realized under the driving of the motor, and the total pitch adjustment and the cyclic variable pitch adjustment are realized under the driving of the three rudders. However, in the above scheme, the motor and the rudder are independently arranged, and the rudder is further composed of a motor and a reduction system, for example, a direct current motor and a reduction gear set, which leads to that the existing power device occupies a large space, the overall structure is complex, and the installation and disassembly are relatively complex, which is not conducive to subsequent replacement and maintenance.

[0044] Therefore, the power device for aircraft provided by the embodiments of the present application has the advantages that Figure 1 As shown in the figure, it comprises:

[0045] The first motor 1 adopts an outer rotor motor, and the stator is arranged in the outer rotor, and the inside of the stator has a hollow space;

[0046] At least two second motors 2 are arranged in the hollow space, and the second motors 2 are arranged in a coaxial series connection in the hollow space, that is, adjacent second motors 2 are sequentially connected along the axial direction.

[0047] In the embodiment, the first motor 1 and the at least two second motors 2 are integrated to form a power device, so that the power device has the functions of rotor driving, total pitch adjustment and cyclic variable-pitch adjustment. The first motor 1 adopts an outer rotor to obtain greater torque. In the embodiment, the first motor 1 and the two second motors 2 are no longer separately arranged, occupy less space, have high integration degree, and have simple and compact overall structure, thereby facilitating installation and later maintenance and repair.

[0048] For example, the first motor 1 is used to drive the propeller to rotate, and the first motor 1 functions as a rotor driving motor. By controlling the rotating speed of the first motor 1, the start-stop, hovering and flight height of the aircraft can be controlled.

[0049] For example, the second motor 2 is used to be connected with the automatic tilting device, and drives the automatic tilting device to adjust the total pitch and cyclic variable pitch of the propeller, and the second motor 2 functions as a variable-pitch motor. The second motor 2 can work alone or simultaneously, and the specific adjustment is based on the need of adjusting the attitude of the aircraft.

[0050] It can be understood that, according to the foregoing example, the take-off and landing and hovering of the aircraft can be realized by controlling the rotating speed of the first motor 1, and the total pitch and cyclic variable pitch of the propeller can be adjusted by driving the automatic tilting device by the second motor 2.

[0051] It should be noted that, Figure 1 The cooling fan 4 is also shown in the figure, which is used to cool and dissipate heat for the first motor 1 and the second motor 2. The specific implementation of the cooling fan 4 will be described in detail in the later embodiments, and will not be described here.

[0052] In the optional example embodiment, as Figure 2 The first motor 1 includes a first motor stator 120, a first motor outer rotor 110 and a first motor support sleeve 140.

[0053] The first motor outer rotor 110 includes a first motor rotor shell 111, and at least two weeks of first motor permanent magnet poles 112 are arranged in the first motor rotor shell 111.

[0054] For example, the first motor permanent magnet poles 112 are arranged on the inner wall of the first motor rotor shell 111, and the number of the first motor permanent magnet poles 112 is at least two weeks. The number of the first motor permanent magnet poles 112 is two weeks, which means that two motors are connected in parallel.

[0055] Exemplarily, the first motor permanent magnet poles 112 are arranged at equal intervals along the length direction of the inner wall of the first motor rotor shell 111.

[0056] It can be understood that, according to the foregoing examples, the number of the first motor permanent magnet poles 112 can also be three turns, that is, a structure of three motors in parallel is adopted; in the case of comprehensive cost, weight and other factors, the number of the first motor permanent magnet poles 112 can be more than three turns.

[0057] The first motor stator 120 is arranged in pairs corresponding to the first motor permanent magnet poles 112; that is, the first motor permanent magnet poles 112 and the first motor stator 120 are arranged correspondingly, and the number of the two is the same.

[0058] Exemplarily, when the number of the first motor permanent magnet poles 112 is two turns, the number of the first motor stator 120 is two; when the number of the first motor permanent magnet poles 112 is three turns, the number of the first motor stator 120 is three. Figure 2 In the embodiment shown, the number of the first motor permanent magnet poles 112 is two turns, and the number of the first motor stator 120 is two.

[0059] It can be understood that, according to the foregoing examples, the number of the first motor permanent magnet poles 112 is at least two turns, and the number of the first motor stator 120 is at least two.

[0060] The first motor stator 120 comprises a first motor stator sleeve 121, and the first motor stator sleeve 121 is a hollow sleeve, and a first motor stator coil 122 is arranged on the outer periphery of the first motor stator sleeve 121.

[0061] The adjacent hollow sleeves are fixedly connected, and the internal cavities of the hollow sleeves are communicated to form the hollow space.

[0062] Exemplarily, the first motor stator sleeve 121 is a hollow sleeve with a hollow structure, and the first motor stator coil 122 is arranged on the outer surface of the first motor stator sleeve 121.

[0063] It can be understood that, according to the foregoing examples, the number of the first motor stator 120 is at least two, and obviously the number of the first motor stator sleeve 121 is at least two, and the adjacent first motor stator sleeves 121 are fixedly connected to form a hollow space inside; the hollow space has the functions as described above, and at least two second motors 2 are arranged in the hollow space.

[0064] Exemplarily, when the number of the first motor permanent magnet poles 112 is three turns, the number of the first motor stator 120 is three, and the number of the first motor stator sleeve 121 is three.

[0065] Exemplarily, the adjacent first motor stator sleeves 121 are fixedly connected by bolts, i.e., the adjacent first motor stator sleeves 121 are fixedly connected by bolts; the hollow sleeves of the hollow structure are in communication with each other in the hollow part under this connection mode, forming a hollow space;

[0066] The first motor support sleeves 140 are arranged in the hollow space, and each first motor stator sleeve 121 is fixedly connected with the first motor support sleeve 140;

[0067] The second motor 2 at the bottom is fixedly connected with the adjacent first motor stator 120.

[0068] Exemplarily, the first motor 1 and the second motor 2 at the bottom are fixedly connected by bolts. After fixedly connected by bolts, the first motor 1 and the second motor 2 can be reliably fixed, avoiding relative movement between them. For example, the bolts are inserted from bottom to top and fixedly connect the second motor 2 at the bottom with the adjacent first motor stator 120. The bolts are not shown in the figure and can be implemented by using the prior art, which will not be described in detail.

[0069] It can be understood that this connection mode is convenient for overall assembly and maintenance of the power device, and the coaxial tandem arranged second motor 2 can be integrally pulled out and installed in the hollow space.

[0070] In this embodiment, energizing the first motor stator coil 122 in the first motor stator 120 can generate a magnetic field. According to the principle of repulsion between similar objects and attraction between dissimilar objects, the first motor permanent magnet pole 112 will rotate relatively under the magnetic force of the magnetic field and drive the first motor rotor shell 111 to rotate. Compared with the single-pole and single-stator structure brushless motor, the first motor 1 can provide greater torque, and the first motor 1 can still work normally when the single-stator fails or the single-permanent-magnet-pole fails, having better safety redundancy.

[0071] In an optional exemplary embodiment, a wire harness insertion hole (not shown in the figure) is further arranged in the first motor stator sleeve 121, and the wire harness of the first motor 1 and the second motor 2 is inserted into the wire harness insertion hole.

[0072] In this embodiment, there is no external wiring, the structure is beautiful, and the wire harness can be protected to prevent wear and tear of the wire harness.

[0073] More specifically, in this embodiment, as Figure 2As shown, the first motor upper end cover 130 is arranged at the top end of the first motor rotor shell 111, and the cooling fan 4 is arranged at the lower end of the first motor rotor shell 111. The cooling fan 4 is driven by the first motor rotor shell 111 to rotate synchronously with the first motor outer rotor 110.

[0074] A first motor tapered roller bearing 180 is arranged between the first motor upper end cover 130 and the first motor support sleeve 140. The first motor support sleeve 140 is used as a rotary support when the first motor upper end cover 130 rotates.

[0075] Exemplarily, a plurality of first motor hub 190 for installing propeller blades are arranged on the first motor upper end cover 130. The first motor upper end cover 130 is rotatably connected to the outer periphery of the first motor support sleeve 140 through the first motor tapered roller bearing 180.

[0076] It can be understood that the first motor support sleeve 140, the first motor stator shaft sleeve 121, the first motor upper end cover 130, and the first motor lower end cover 150 are coaxially arranged and can collectively provide rotary support for the first motor outer rotor 110. Among them:

[0077] According to the foregoing examples, the number of the first motor stator shaft sleeve 121 is at least two. The first motor lower end cover 150 is arranged at the lower end of the first motor stator shaft sleeve 121 located at the bottom.

[0078] Exemplarily, the first motor lower end cover 150 is fixedly arranged on the first motor stator 120 and connected with the first motor stator shaft sleeve 121 located at the bottom.

[0079] Exemplarily, a bearing is arranged between the cooling fan 4 and the first motor lower end cover 150. The cooling fan 4 is rotatably connected to the outer periphery of the first motor lower end cover 150 through the bearing to ensure smooth rotation of the cooling fan 4.

[0080] Ventilation holes are respectively arranged on the first motor rotor shell 111, the first motor upper end cover 130, the first motor lower end cover 150, and the first motor stator shaft sleeve 121. The gaps or cavities between the components are communicated through the ventilation holes to form an axial airflow passage inside the power device. The ventilation holes are not all shown in the figure. The ventilation holes on the first motor lower end cover 150 can be seen from Figure 7

[0081] In this embodiment, the airflow flowing through the axial airflow passage further dissipates heat for the first motor 1 and the second motor 2, and further optimizes the heat dissipation effect of the cooling fan 4.

[0082] It can be understood that the arrangement of the ventilation holes can reduce the overall weight of the power device, thereby reducing the energy loss caused by the weight and further facilitating the development demand of lightweight aircraft.​

[0083] It can be understood that the multiple ventilation holes are arranged at intervals, which helps to improve the heat dissipation effect and prolong the service life of the first motor 1 and the second motor 2.

[0084] It can be understood that the ventilation hole can be a strip hole or a circular hole. The larger the opening area, the larger the heat dissipation and ventilation volume, and the better the heat dissipation effect.

[0085] The first motor electric governor (not shown in the figure) is arranged on the lower end cover 150 of the first motor, and the input line thereof is connected to the power supply unit, and the output line thereof is connected to the first motor 1.

[0086] The first motor Hall inductor 170 is arranged on the outer wall of the first motor stator 120.

[0087] Exemplarily, the at least two first motor Hall inductors 170 are mounted on the outer wall of the first motor stator shaft sleeve 121 through the mounting frame.

[0088] Exemplarily, the two first motor Hall inductors 170 are arranged at an angle of 180° on the circumference and symmetrically located on both sides of the outer wall of the first motor stator shaft sleeve 121. Each of the first motor permanent magnet magnetic poles 112 includes a plurality of magnetic steels, and the position of the first motor Hall inductor 170 corresponds to the position of one of the magnetic steels in one of the first motor permanent magnet magnetic poles 112.

[0089] The working process of the embodiment is as follows: the first motor rotor shell 111 drives the first motor upper end cover 130 to rotate, the first motor support sleeve 140 provides rotary support for the first motor upper end cover 130, and the first motor upper end cover 130 drives the propeller to rotate through the first motor hub 190.

[0090] At the same time, the first motor rotor shell 111 also drives the cooling fan 4 to rotate, and the cooling fan 4 drives the airflow to flow, thereby cooling and dissipating heat of the first motor 1 and the second motor 2 to prevent the first motor 1 and the second motor 2 from being damaged by high temperature during long-term operation.

[0091] The first motor electric governor adopts an external structure and is used to control the start-stop, rotation speed and rotation direction of the first motor 1. The number of the first motor electric governors is matched with the number of the first motor stators 120, and the corresponding first motor electric governor is used to electrify the corresponding first motor permanent magnet magnetic pole 112, so as to individually or jointly drive the first motor rotor shell 111 to rotate.

[0092] The first motor Hall inductor 170 indirectly monitors the rotation position and rotation speed of the first motor outer rotor 110 by monitoring the position of the magnetic steel, and can judge the fault position and fault reason of the first motor 1 according to the detected real-time information.

[0093] More specifically, in the present embodiment, as shown in Figure 2 、 Figure 5 、 Figure 6 the first motor upper end cover 130 is in a bowl structure, and the upper bowl mouth and the lower bowl mouth are respectively in dynamic sealing connection with the first motor support sleeve 140, so as to form a sealed space between the first motor upper end cover 130 and the first motor support sleeve 140;

[0094] Exemplarily, the first motor upper end cover 130 is in a bowl structure, and the upper bowl mouth and the lower bowl mouth are respectively in dynamic sealing connection with the first motor support sleeve 140 through sealing means such as oil seal and sealing ring, so as to form a sealed space between the first motor upper end cover 130 and the first motor support sleeve 140;

[0095] The first motor conical roller bearing 180 is arranged in the sealed space;

[0096] The self-lubricating cooling system 3 is arranged in the sealed space;

[0097] Exemplarily, the first motor conical roller bearing 180 is arranged in the sealed space, and the self-lubricating cooling system 3 is arranged in a matched manner, and the self-lubricating cooling system 3 is used for lubricating and cooling the first motor conical roller bearing 180, the first motor 1 and the second motor 2;

[0098] In the present embodiment, the first motor upper end cover 130 is used as the shell of the self-lubricating system, and when the local temperature of the first motor conical roller bearing 180, the first motor 1 and the second motor 2 is too high, the circulating lubricating oil in the self-lubricating cooling system 3 carries heat to other positions, and when each component is a metal piece, a better heat dissipation effect can be achieved.

[0099] In the optional exemplary embodiment, as shown in Figure 5 、 Figure 6 the self-lubricating cooling system 3 comprises an impeller 310, an oil guide plate 330, a vortex cover 320 and an oil cavity 340;

[0100] The vortex cover 320 is sealingly connected to the upper bowl mouth of the first motor upper end cover 130, and is in dynamic sealing connection with the first motor support sleeve 140;

[0101] The oil guide plate 330 is arranged above the first motor conical roller bearing 180, and the oil guide plate 330 is fixedly sleeved on the first motor support sleeve 140;

[0102] The impeller 310 is arranged below the first motor conical roller bearing 180, and the impeller 310 is sleeved on the first motor support sleeve 140 and is fixedly connected with the first motor upper end cover 130;

[0103] Exemplarily, the first motor conical roller bearing 180 is in the middle in the horizontal direction, an oil guide disc 330 is arranged above the first motor conical roller bearing 180, and the impeller 310 is arranged below the first motor conical roller bearing 180, and the three components are sequentially arranged from top to bottom in the sealing space.

[0104] The circulating oil passage 341 is arranged in the first motor support sleeve 140 and the first motor stator shaft sleeve 121, the circulating oil passage 341 is communicated to form the oil cavity 340, the oil outlet 342 and the oil return port 343 of the oil cavity 340 are arranged on the first motor support sleeve 140, and the oil outlet 342 is located at the position of the impeller 310, and the oil return port 343 is located at the position of the oil guide disc 330.

[0105] Exemplarily, the circulating oil passage 341 is arranged in the sleeve wall of the first motor support sleeve 140 and the shaft sleeve wall of the first motor stator shaft sleeve 121, and the circulating oil passage 341 in the first motor support sleeve 140 and the first motor stator shaft sleeve 121 is communicated to form the oil cavity 340.

[0106] Exemplarily, according to the foregoing examples, each of the first motor stator shaft sleeves 121 is fixedly connected with the first motor support sleeve 140, the oil outlet end and the oil inlet end of the circulating oil passage 341 can be aligned and communicated to form the oil cavity 340 when the first motor support sleeve 140 and the first motor stator shaft sleeve 121 are fixedly connected, and the specific communication mode can be implemented by using the existing technology, and details are not described herein.

[0107] Exemplarily, the oil outlet 342 and the impeller 310 are arranged at the same horizontal height or slightly lower than the horizontal height of the impeller 310, and the oil return port 343 and the oil guide disc 330 are arranged at the same horizontal height or slightly higher than the horizontal height of the oil guide disc 330, and the specific position can be selected by using the existing technology, and the oil outlet 342 is arranged at the position of the impeller 310 and the oil return port 343 is arranged at the position of the oil guide disc 330, so as to ensure the continuous and smooth flow of the lubricating oil.

[0108] In this embodiment, the sealing space and the oil cavity 340 are filled with lubricating oil in advance, the impeller 310 fixedly connected with the first motor upper end cover 130 rotates synchronously under the driving of the first motor outer rotor 110, and the lubricating oil at the oil outlet 342 is thrown to the edge of the impeller 310 under the action of centrifugal force, so as to form a pressure difference.

[0109] Under the action of the pressure difference, the lubricating oil flows from the edge of the impeller 310, passes through the first motor conical roller bearing 180, and then flows back to the oil cavity 340 through the oil return port 343 of the oil guide disc 330, so that the lubricating oil circulates in the sealing space and the oil cavity 340.

[0110] On the one hand, the circulating lubricating oil lubricates the first motor conical roller bearing 180, so as to reduce the wear of the first motor conical roller bearing 180.

[0111] On the other hand, the circulating lubricating oil can also take out the heat generated by the rotation of the first motor conical roller bearing 180, the first motor 1 and the second motor 2 in a heat conduction manner to achieve the effect of heat dissipation, reduce the working temperature of the first motor 1 and the second motor 2, and thereby prolong the service life of the power device and reduce the maintenance cost of the aircraft.

[0112] In the optional example embodiment, as shown in Figure 3 , when arranged in coaxial series, a gap is left between adjacent second motors 2, which can ensure that the airflow driven by the cooling fan 4 can smoothly flow through each second motor 2, ensuring good heat dissipation performance;

[0113] The second motors 2 are fixedly connected through the connecting plates 230;

[0114] For example, the second motor 2 includes a second motor stator 220, and the connecting plate 230 is fixedly connected with the second motor stator 220 to achieve the fixed connection between adjacent second motors 2. At this time, the connecting plate 230 can be a short connecting plate, which is only used to connect adjacent second motors 2;

[0115] For example, the second motor 2 includes a second motor stator 220, and the connecting plate 230 is fixedly connected with the second motor stator 220 to achieve the fixed connection between adjacent second motors 2. At this time, the connecting plate 230 can be a short connecting plate, which is only used to connect adjacent second motors 2;

[0116] For example, the connecting plate 230 is arranged along the circumference of the second motor stator 220, so that the connecting plate 230 is arranged at the side wall of the second motor stator 220;

[0117] For example, the short connecting plate and the long connecting plate can be used alternatively, or can be used simultaneously, as shown in Figure 3 , Figure 4 , Figure 7 The three second motors 2 are arranged in coaxial series, and a gap is left between the three second motors 2. The connecting plate 230 is divided into a long connecting plate and a short connecting plate, and the number of each is four, Figure 3 only one long connecting plate and three short connecting plates are shown in the embodiment, the short connecting plate is used to fixedly connect the second motor stators 220 of the two second motors 2 located at the bottom end, and the long connecting plate is used to sequentially connect the second motor stators 220 of each second motor 2. The specific assembly position of the connecting plate can be referred to Figure 7 , two long connecting plates and two short connecting plates are alternately and symmetrically arranged;

[0118] It can be understood that in the specific assembly process, the second motors 2 can be first arranged in a coaxial series and fixedly connected through the connecting plate 230, then the coaxially arranged second motors 2 are inserted into the hollow space of the first motor stator 120 as a whole, and finally the second motor 2 at the bottom is fixedly connected with the first motor stator 120 of the first motor 1 by screwing from bottom to top.

[0119] In the alternative exemplary embodiment, as shown in Figure 3 、 Figure 4 The second motor 2 is an outer rotor motor, which includes a second motor stator 220, a second motor outer rotor 210 and a second motor rotating shaft sleeve 214.

[0120] Exemplarily, the second motor 2 also adopts an outer rotor scheme, and the stator is arranged in the outer rotor, and a hollow space is arranged in the inner part of the stator.

[0121] The second motor outer rotor 210 includes a second motor rotor shell 211, a second motor permanent magnet pole 212 is arranged in the second motor rotor shell 211, and a second motor end cover 213 is arranged at the top end of the second motor rotor shell 211.

[0122] Exemplarily, the second motor permanent magnet pole 212 is arranged on the inner wall of the second motor rotor shell 211, and the second motor end cover 213 is arranged at the top end thereof.

[0123] The second motor stator 220 includes a second motor stator shaft sleeve 221, which is a hollow shaft sleeve, and a second motor stator coil 222 is arranged on the outer periphery of the second motor stator shaft sleeve 221.

[0124] Exemplarily, the second motor stator shaft sleeve 221 is provided with a protruding part for connecting with the connecting plate 230, and when the second motor stator 220 of each second motor 2 is fixedly connected with the connecting plate 230, the connecting plate 230 is fixed to the protruding part of the second motor stator shaft sleeve 221 of the second motor stator 220.

[0125] The internal cavity of the hollow shaft sleeve is used to accommodate the second motor rotating shaft sleeve 214.

[0126] Exemplarily, the second motor rotating shaft sleeve 214 is arranged in the hollow space and rotates through a bearing.

[0127] The second motor end cover 213 is fixedly connected with the second motor rotating shaft sleeve 214.

[0128] The second motor rotating shaft sleeve 214 is provided with a threaded shaft hole, and the shaft hole is used to screw with a screw rod.

[0129] Exemplarily, the second motor rotating shaft sleeve 214 has a threaded inner hole for connecting with the screw rod, and a thread is arranged on the inner hole wall of the second motor rotating shaft sleeve 214 (as the thread is arranged on the inner hole wall, it is an internal thread), which is used for connecting with the screw rod;

[0130] The second motor electric governor 240 is arranged on the outer surface of the second motor rotating shaft sleeve 214 and is fixedly connected with the second motor stator sleeve 221, the input line of the second motor electric governor 240 is connected with the power supply unit, and the output line of the second motor electric governor 240 is connected with the second motor 2; the second motor electric governor 240 is used for controlling the start-stop, rotating speed and rotating direction of the second motor 2;

[0131] Exemplarily, the second motor electric governor 240 is connected with the second motor stator sleeve 221 through a heat conduction block; the heat conduction block transmits the heat generated by the second motor electric governor 240 during operation to the second motor stator sleeve 221 in a heat conduction manner, so as to avoid that the temperature of the second motor electric governor 240 is too high, thereby ensuring the stability and service life of the second motor electric governor 240;

[0132] The second motor Hall inductor 250 is arranged on the second motor electric governor 240;

[0133] The second motor magnetic disk 260 is arranged on the outer surface of the second motor rotating shaft sleeve 214, and a gap is left between the second motor Hall inductor 250 and the second motor magnetic disk 260; the second motor Hall inductor 250 is used for monitoring the rotating speed and position of the second motor magnetic disk 260 in real time.

[0134] The working process of the embodiment is as follows: the power output form of the second motor 2 is linear motion, the second motor rotating shaft sleeve 214 is used as a power output shaft, the second motor rotor shell 211 drives the second motor end cover 213 and the second motor rotating shaft sleeve 214 to rotate synchronously, the second motor rotating shaft sleeve 214 is threadedly connected with the screw rod, and the power is transmitted to the automatic tilting device through the screw rod, so that the automatic tilting device adjusts the total pitch and the cyclic variable pitch of the paddle.

[0135] The second motor Hall inductor 250 indirectly monitors the rotating speed and position of the second motor 2 by monitoring the rotating speed and position of the second motor magnetic disk 260 in real time, and can judge the fault position and fault reason of the second motor 2 according to the detected real-time data.

[0136] The application also provides an electrically-powered aircraft, which comprises the aircraft power device as described above. Based on the aircraft power device, the power device has high integration degree, simple overall structure, is convenient to install, and has the functions of rotor driving, total pitch adjustment and cyclic variable pitch adjustment. The first motor 1 can still work normally when a single stator or a single permanent magnet magnetic pole fails, and has better safety redundancy.

[0137] It should be noted that the above-mentioned embodiments are only used to illustrate but not to limit the technical solutions of the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified or some or all of the technical features thereof can be substituted with equivalent technical features without departing from the scope of the technical solutions of the embodiments of the present application.

[0138] In addition, it should be noted that each of the specific technical features described in the foregoing embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present application.

Claims

1. A power plant for an aircraft, characterized in that: The aircraft power device includes a first motor and at least two second motors; The first motor is an outer rotor motor, and the interior of the stator of the first motor has a hollow space; The at least two second motors are connected in sequence along the axial direction, and the at least two second motors are both arranged in the hollow space; The first motor includes a first motor stator, a first motor outer rotor and a first motor support sleeve; The first motor outer rotor comprises a first motor rotor housing, wherein at least two first motor permanent magnet poles are arranged in the first motor rotor housing; The first motor stator and the first motor permanent magnet poles are arranged in pairs corresponding to each other; The first motor stator comprises a first motor stator sleeve, which is a hollow sleeve, and a first motor stator coil is provided on the outer periphery of the first motor stator sleeve; Adjacent first motor stator sleeves are fixedly connected, and the internal cavities of the first motor stator sleeves are connected to form the hollow space; The first motor support sleeve is arranged in the hollow space, and each of the first motor stator sleeves is fixedly connected to the first motor support sleeve respectively; The second motor is an outer rotor motor, comprising a second motor stator, a second motor outer rotor and a second motor rotating shaft sleeve; The second motor outer rotor comprises a second motor rotor housing, a second motor permanent magnet pole is provided in the second motor rotor housing, and a second motor end cover is provided at the top end of the second motor rotor housing; The second motor stator includes a second motor stator sleeve, which is a hollow sleeve, and a second motor stator coil is provided on the outer periphery of the second motor stator sleeve; The inner cavity of the second motor stator sleeve is used to accommodate the second motor rotating sleeve; The second motor end cover is fixedly connected to the second motor rotating shaft sleeve.

2. The aircraft power plant according to claim 1, characterized in that: A first motor upper end cover is provided at the top of the first motor rotor housing, and a cooling fan that rotates synchronously with the first motor rotor housing is provided at the lower end of the first motor rotor housing; A first motor tapered roller bearing is provided between the first motor upper end cover and the first motor support sleeve; The lower end of the first motor stator sleeve located at the bottom end is provided with a first motor lower end cover; The first motor rotor housing, the first motor upper end cover, the first motor lower end cover and the first motor stator sleeve are respectively provided with ventilation holes, and the ventilation holes are connected to form an axial air duct.

3. The aircraft power plant according to claim 2, characterized in that: The upper end cover of the first motor is a bowl-shaped structure, and the upper and lower bowl openings are respectively sealed with the first motor support sleeve, and the upper end cover of the first motor and the first motor support sleeve form a sealed space; The first motor tapered roller bearing is arranged in the sealed space; A self-lubricating cooling system is provided in the sealed space.

4. The aircraft power plant according to claim 3, characterized in that: The self-lubricating cooling system includes a vortex cover, an oil guide plate, an impeller and an oil cavity; The turbine cover is sealingly connected to the upper bowl of the upper end cover of the first motor, and the turbine cover is dynamically sealingly connected to the first motor support sleeve; The oil guide plate is arranged above the first motor tapered roller bearing, and the oil guide plate is fixedly sleeved on the first motor support sleeve; The impeller is arranged below the tapered roller bearing of the first motor, the impeller is sleeved on the support sleeve of the first motor, and is fixedly connected to the upper end cover of the first motor; A circulating oil circuit is provided in the first motor support sleeve and the first motor stator sleeve, and the circulating oil circuit is connected to form an oil chamber. The oil outlet and oil return port of the oil chamber are both provided on the first motor support sleeve, and the oil outlet is located at the position of the impeller, and the oil return port is located at the position of the oil guide plate.

5. The aircraft power plant according to claim 1, characterized in that: The second motor rotating shaft sleeve has a threaded inner hole for connecting with a screw rod.

6. The aircraft power plant according to claim 1, characterized in that: The second motor stators of each second motor are fixedly connected via a connecting plate.

7. The aircraft power plant according to claim 1, characterized in that: The first motor and the second motor located at the bottom are fixedly connected by bolts.

8. An aircraft, characterized in that: An aircraft power plant comprising the power plant according to any one of claims 1 to 7.

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