Electric motor, electric propulsion device and aircraft

Abstract

The application provides an electric motor, an electric propulsion device and an aircraft, and relates to the technical field of the aircraft.The electric motor comprises a stator, a bearing, a rotor and a conductive assembly; the rotor is configured to be connected with a hub of the electric propulsion device; the rotor is connected with a rotating shaft; the rotating shaft is rotationally connected with the stator through the bearing; and the bearing and the stator are insulated; the conductive assembly is conductively connected with the bearing; and the conductive assembly is configured to guide the current transmitted by the hub to the outside of the electric motor.In the electric motor, the current on the bearing cannot be guided to the stator, that is, the lightning current and the electrostatic current on the blades and the hub cannot flow to the stator; the conductive assembly plays a role in guiding the lightning current and the electrostatic current; the conductive assembly guides the current transmitted by the hub to the outside of the electric motor, thereby protecting the internal components of the electric motor, and improving the protection effect of the electric motor on lightning and electrostatic.

Description

TECHNICAL FIELD

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

[0002] An electric vertical take-off and landing (eVTOL) aircraft is an aircraft that uses electricity as a source of flight power and has the function of vertical take-off and landing, and has the characteristics of vertical take-off and landing, intelligent operation, low noise, low emission, easy maintenance, high safety, etc. An electric propulsion device is a system for providing lift or thrust for an electric vertical take-off and landing aircraft (hereinafter referred to as an aircraft), including an electric motor, a propeller, etc. The propeller includes a blade and a hub, and the electric motor drives the blade to rotate through the hub. During flight, the aircraft is prone to being struck by lightning or generating static electricity due to the friction between the blades of the aircraft and the air. The above lightning and static electricity can affect the stability of use of the electric motor. In related technologies, a carbon brush or slip ring is arranged between the rotor and the stator of the electric motor to guide the current of lightning or static electricity.

[0003] However, the above lightning and static electricity protection method can easily affect the electric motor, frequent maintenance is required, and the protection effect is not good. SUMMARY

[0004] The present application provides an electric motor, an electric propulsion device and an aircraft to solve the technical problem of poor lightning and static electricity protection effect of the existing aircraft on the electric motor.

[0005] A first aspect of an embodiment of the present application provides an electric motor, comprising:

[0006] a stator;

[0007] a bearing;

[0008] a rotor configured to be connected to a hub of an electric propulsion device, the rotor being connected to a rotating shaft, the rotating shaft being rotatably connected to the stator through the bearing, and the bearing and the stator being insulated;

[0009] a conductive assembly in conductive connection with the bearing, the conductive assembly being configured to guide the current transmitted by the hub to the outside of the electric motor.

[0010] In a possible implementation, the rotor is rotatably sleeved outside the stator and forms a rotating gap, and the rotating gap is insulated.

[0011] In a possible implementation, the rotor rotating sleeve is arranged outside the stator, the shaft is arranged inside the stator, the bearing comprises a bearing inner ring, a bearing outer ring and bearing rolling elements rotatingly arranged between the bearing inner ring and the bearing outer ring, the bearing inner ring is connected with the shaft, and the bearing outer ring is connected with the inside of the stator and is arranged in an insulating manner.

[0012] One end of the conductive assembly is in conductive connection with the bearing outer ring, and the other end of the conductive assembly extends to the outside of the electric motor.

[0013] In a possible implementation, an insulating layer is arranged at the connection between the bearing outer ring and the stator.

[0014] In a possible implementation, the conductive assembly comprises a conductive lug, a conductive wire and an electromagnetic shielding sleeve, the conductive lug is connected with the bearing outer ring, and the conductive lug is arranged in an insulating manner between the rotor and the stator respectively, one end of the conductive wire is connected with the end of the conductive lug away from the bearing outer ring, the other end of the conductive wire extends to the outside of the electric motor, and the electromagnetic shielding sleeve is sleeved outside the conductive wire.

[0015] In a possible implementation, the conductive assembly further comprises a conductive ring, the conductive ring is coaxial with the bearing outer ring, and the conductive ring is in conductive connection with the bearing outer ring, the conductive ring is arranged in an insulating manner with the stator, and the conductive lug is in conductive connection with the conductive ring or is arranged in an integral manner.

[0016] In a possible implementation, the other end of the conductive lug away from the connection end of the bearing outer ring extends towards the side close to the rotating center line of the rotor.

[0017] In a possible implementation, an insulating layer is arranged on the side of the conductive lug close to the stator, and / or an insulating layer is arranged on the side of the conductive lug close to the rotor.

[0018] In a possible implementation, a motor controller is further included, the motor controller comprises a controller mounting plate, the stator comprises a stator cavity, and the motor controller is at least partially arranged in the stator cavity.

[0019] The controller mounting plate is provided with a controller through hole, the conductive assembly is arranged through the controller through hole and extends to the outside of the electric motor, and / or the conductive assembly passes through the stator cavity and extends to the outside of the electric motor.

[0020] In a possible implementation, the motor controller further comprises first electronic components and second electronic components, the electromagnetic sensitivity of the first electronic components is higher than the electromagnetic sensitivity of the second electronic components;

[0021] The distance between the first electronic components and the controller through hole is greater than the distance between the second electronic components and the controller through hole.

[0022] In a possible implementation, the motor further comprises a motor rear cover and a stator support, the motor rear cover and the stator support are connected to enclose the stator cavity, the motor rear cover has a motor rear cover through hole, and the conductive assembly passes through the controller through hole and the motor rear cover through hole and extends to the outside of the electric motor.

[0023] In a possible implementation, the conductive assembly comprises a conductive lug and a conductive wire, the stator comprises a stator support, the stator support is provided with an electromagnetic shielding channel, the conductive assembly is insulated from the electromagnetic shielding channel, one end of the electromagnetic shielding channel is located on the side of the stator support close to the bearing outer ring, and the other end of the electromagnetic shielding channel extends to the outside of the electric motor.

[0024] One end of the conductive lug is connected to the bearing outer ring, the other end of the conductive lug extends into the electromagnetic shielding channel and is insulated from the electromagnetic shielding channel, one end of the conductive wire is connected to the conductive lug, and the other end of the conductive wire extends to the outside of the electric motor through the electromagnetic shielding channel.

[0025] In a possible implementation, the motor further comprises a motor controller, at least part of the motor controller is arranged inside the stator support.

[0026] The motor controller is provided with first electronic components and second electronic components, the electromagnetic sensitivity of the first electronic components is higher than the electromagnetic sensitivity of the second electronic components.

[0027] The distance between the first electronic components and the electromagnetic shielding channel is greater than the distance between the second electronic components and the electromagnetic shielding channel; and / or, the electromagnetic shielding channel is a reinforcing rib of the stator support.

[0028] In a possible implementation, conductive grease is arranged between the bearing inner ring and the bearing rolling element, and / or between the bearing outer ring and the bearing rolling element.

[0029] A second aspect of the embodiment of the application provides an electric propulsion device, comprising:

[0030] A paddle;

[0031] The hub is electrically connected to the blades;

[0032] In any of the above-mentioned electric motors, the propeller hub is connected to the rotor of the electric motor.

[0033] In one possible implementation, a pitch control mechanism is also included, which is connected to the blade root and the blade hub.

[0034] The connection between the pitch mechanism and the propeller root, as well as the connection between the pitch mechanism and the propeller hub, are both insulated.

[0035] A third aspect of this application provides an aircraft, comprising:

[0036] The body, the body being externally covered with a skin, the skin being a conductive component;

[0037] The electric motor described in any one of the preceding claims; or the electric propulsion device described in any one of the preceding claims;

[0038] The conductive components of the electric motor are electrically connected to the skin.

[0039] The application provides an electric motor, an electric propulsion device and an aircraft. The electric motor comprises a stator, a bearing, a rotor and a conductive assembly; the rotor is configured to be connected with a hub of the electric propulsion device, the rotor is connected with a rotating shaft, the rotating shaft is rotationally connected with the stator through the bearing, and the bearing and the stator are insulated; the conductive assembly is conductively connected with the bearing, and the conductive assembly is configured to guide the current transmitted by the hub to the outside of the electric motor. In the electric motor, the rotor is connected with the hub of the electric propulsion device, the rotor drives the blades on the hub to rotate through the hub, thereby realizing the propulsion of the electric propulsion device; when the aircraft is struck by lightning or static electricity is generated on the blades, the current will be transmitted to the hub, the current on the hub will be transmitted to the rotor, the rotating shaft is connected with the rotor, the rotating shaft is rotationally connected with the stator through the bearing, thereby the current on the rotor will be transmitted to the bearing; because the bearing and the stator are insulated, the current on the bearing will not be transmitted to the stator; because the conductive assembly is conductively connected with the bearing, the conductive assembly can guide the current on the bearing to the outside of the electric motor, for example, to the skin of the aircraft body. Because the electric motor guides the current on the bearing to the outside of the electric motor through the conductive assembly, and the bearing and the stator are insulated, the current on the bearing will not be transmitted to the stator, that is, the lightning and static current on the blades and the hub will not flow to the stator, and the conductive assembly plays a role in guiding the lightning and static current; the conductive assembly guides the current transmitted by the hub to the outside of the electric motor, thereby protecting the internal parts of the electric motor and improving the protection effect of the electric motor on lightning and static electricity. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application.

[0041] Figure 1 A structural schematic diagram of an aircraft provided for an embodiment of the application;

[0042] Figure 2 A structural schematic diagram of an electric propulsion device provided for an embodiment of the application;

[0043] Figure 3 Another structural schematic diagram of an electric propulsion device provided for an embodiment of the application;

[0044] Figure 4 A cross-sectional structural schematic diagram of an electric motor provided for an embodiment of the application;

[0045] Figure 5 Another cross-sectional structural schematic diagram of an electric motor provided for an embodiment of the application;

[0046] Figure 6 Structure diagram of the electromagnetic shielding channel provided on the stator in the electric motor of the embodiment of the present application;

[0047] Figure 7 Structure diagram of the conductive lug in the electric motor of the embodiment of the present application;

[0048] Figure 8 Structure diagram of the connection between the bearing outer ring and the stator in the electric motor of the embodiment of the present application;

[0049] Figure 9 Another structure diagram of the connection between the bearing outer ring and the stator in the electric motor of the embodiment of the present application;

[0050] Figure 10 Still another structure diagram of the connection between the bearing outer ring and the stator in the electric motor of the embodiment of the present application;

[0051] Figure 11 Structure diagram of the positional relationship between the first type of electronic component and the second type of electronic component and the electromagnetic shielding sleeve in the electric motor of the embodiment of the present application.

[0052] Explanation of reference numerals:

[0053] 10 - body; 11 - wing; 12 - tail; 13 - arm; 14 - nacelle;

[0054] 20 - electric propulsion device; 21 - blade; 22 - hub; 23 - variable pitch mechanism;

[0055] 30 - winding;

[0056] 40 - magnet;

[0057] 100 - stator; 110 - motor rear cover;

[0058] 200 - bearing; 210 - bearing inner ring; 220 - bearing outer ring; 230 - bearing rolling element;

[0059] 300 - rotor; 310 - rotating shaft;

[0060] 400 - conductive assembly; 410 - conductive lug; 420 - conductive wire; 430 - electromagnetic shielding sleeve; 440 - terminal; 450 - conductive ring;

[0061] 500 - insulating layer;

[0062] 600 - motor controller; 610 - controller through hole;

[0063] 700 - first type of electronic component;

[0064] 800 - second electronic component; 810 - second predetermined range;

[0065] 900 - electromagnetic shielded passage.

[0066] The specific embodiments of the application will be described in detail below with reference to the attached drawings. These drawings and the following description are not intended to limit the scope of the application in any way, but merely to describe the concept of the application in sufficient detail to enable one of ordinary skill in the art to make and use it. DETAILED DESCRIPTION

[0067] The exemplary embodiments will be described in detail below with reference to the attached drawings. The following description is made with reference to the accompanying drawings, in which like reference numerals refer to like elements, and is made in the context of specific embodiments. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the application. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the application as detailed in the appended claims. Based on the embodiments described in this application, all other embodiments obtained by one of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0068] It should be noted that all directional indications, such as upper, lower, left, right, front, back, etc., are merely used for convenience of description and are not intended to limit the application to any particular orientation. The above description is only the preferred embodiment of the application, and the scope of the application is not limited to the above. Any changes, equivalent replacements, improvements, etc. made by those skilled in the art without departing from the concept of the application shall fall within the scope of the application.

[0069] In the present application, unless otherwise clearly specified and limited, the terms "connection", "fixing", etc. should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements, unless otherwise clearly specified and 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.

[0070] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, B scheme, and A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0071] The electric vertical take-off and landing (eVTOL) aircraft is an aircraft with electric power as the flight power source and vertical take-off and landing function, which has the characteristics of vertical take-off and landing, intelligent operation, low noise, low emission, easy maintenance, high safety, etc.

[0072] The electric vertical take-off and landing aircraft (hereinafter referred to as aircraft) includes a body and an electric propulsion device, the body is provided with a skin, the electric propulsion device is arranged on the body, the electric propulsion device includes a blade, a hub and an electric motor, the blade is connected to the hub, the hub is connected to the rotor of the electric motor, and the rotor of the electric motor drives the blade to rotate through the hub. The electric motor is used to provide power for the aircraft. During flight, the aircraft is easy to be struck by lightning or static electricity generated by the friction of the aircraft blades. The above lightning and static electricity will be transmitted to the electric motor through the blades and the hub, which will affect the use stability of the electric motor. In the related art, a carbon brush or slip ring is arranged between the rotor and the stator of the electric motor to guide the current of lightning or static electricity.

[0073] Specifically, the conductive slip ring is installed on the rotor shaft, and the carbon brush assembly is fixed on the stator side. The carbon brush is connected to the aircraft body grounding network through a wire, and finally the current is introduced into the airborne lightning protection system or directly discharged into the atmosphere.

[0074] The design of guiding lightning or electrostatic current by setting carbon brush or slip ring on the electric motor has significant protection defects, and the main problems are caused by the dynamic instability of mechanical contact structure, insufficient high current carrying capacity, poor environmental adaptability and easy current conduction to the stator. Specifically, the dynamic contact between the carbon brush and the slip ring is poor, the carbon brush maintains contact with the rotating slip ring through spring pressure, but in use, the carbon brush is prone to radial swing, resulting in fluctuation of contact resistance, and the increase of contact resistance will cause local high temperature at the moment of lightning, even welding the contact surface, making the conduction path invalid, causing protection failure, and when the carbon brush and the slip ring fail, the current will be conducted to the stator through the bearing, causing damage to the parts on the stator; and lightning transient can easily damage the conduction performance of the carbon brush or the slip ring; carbon powder is generated by friction between the carbon brush and the slip ring, which will cause short circuit or ring fire after accumulation, which will also easily cause protection failure, eventually leading to the conduction of current to the stator, causing damage to the parts on the stator; and since the carbon brush and the slip ring need to be regularly maintained, cleaned or replaced, the carbon powder falling from the carbon brush needs to be cleaned regularly, resulting in frequent maintenance of the carbon brush and the slip ring, and the carbon brush and the slip ring are only suitable for low-speed motors, and high-speed motors can damage the conduction performance of the carbon brush or the slip ring.

[0075] Therefore, although the carbon brush and the slip ring can guide the current between the rotor and the stator of the electric motor, the carbon brush and the slip ring are prone to affect the electric motor due to the above reasons, not only making the electric motor need frequent maintenance, but also easily causing the failure of current guidance, when the current guidance fails, the lightning and electrostatic current on the blade will flow through the hub, the rotor, the bearing, and then to the stator, and the current will affect the winding and the controller in the stator, thereby causing damage to the entire electric motor.

[0076] In order to solve the technical problem of poor lightning and electrostatic protection effect of the existing aircraft on the electric motor, the application provides an electric motor, an electric propulsion device and an aircraft. The electric motor comprises a stator, a bearing, a rotor and a conductive assembly; the rotor is configured to be connected with a hub of the electric propulsion device, the rotor is connected with a rotating shaft, the rotating shaft is rotationally connected with the stator through the bearing, and the bearing and the stator are insulated; the conductive assembly is conductively connected with the bearing, and the conductive assembly is configured to guide the current transmitted by the hub to the outside of the electric motor.

[0077] In the electric motor of the application, the rotor is connected with the hub of the electric propulsion device, the rotor drives the blades on the hub to rotate, thereby realizing the propulsion of the electric propulsion device. When the aircraft is struck by lightning or static electricity is generated on the blades, causing the blades to have current, the current will be transmitted to the hub, the current on the hub will be transmitted to the rotor, the rotor is connected with the shaft, the shaft is rotatably connected with the stator through the bearing, thereby the current on the rotor will be transmitted to the bearing. Because the bearing and the stator are insulated, the current on the bearing will not be transmitted to the stator. Because the conductive assembly is in conductive connection with the bearing, the conductive assembly can lead the current on the bearing to the outside of the electric motor, such as to the skin of the aircraft body. Since the electric motor of the application leads the current on the bearing to the outside of the electric motor through the conductive assembly, and the bearing and the stator are insulated, the current on the bearing will not be led to the stator, that is, the lightning and static current on the blades and the hub will not flow to the stator, and the conductive assembly plays a role in conducting the lightning and static current. The conductive assembly leads the current transmitted by the hub to the outside of the electric motor, thereby protecting the internal parts of the electric motor and improving the protection effect of the electric motor against lightning and static electricity.

[0078] The technical solutions of the application will be described in detail below with reference to the drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in detail in some embodiments.

[0079] Referring to Figures 1 to 9 , the structure schematic diagram of the aircraft provided for the embodiment of the application is shown; Figure 1 , the structure schematic diagram of the electric propulsion device provided for the embodiment of the application is shown; Figure 2 , the structure schematic diagram of the electric propulsion device provided for the embodiment of the application is shown; Figure 3 , the structure schematic diagram of the electric propulsion device provided for the embodiment of the application is shown; Figure 4 , the cross-sectional structure schematic diagram of the electric motor provided for the embodiment of the application is shown; Figure 5 , the cross-sectional structure schematic diagram of the electric motor provided for the embodiment of the application is shown; Figure 6 , the structure schematic diagram of the electric motor in which the electromagnetic shielding channel is arranged on the stator provided for the embodiment of the application is shown; Figure 7 , the structure schematic diagram of the electric motor in which the conductive ear is arranged provided for the embodiment of the application is shown; Figure 8 , the structure schematic diagram of the electric motor in which the bearing outer ring is connected with the stator provided for the embodiment of the application is shown; Figure 9 , the structure schematic diagram of the electric motor in which the bearing outer ring is connected with the stator provided for the embodiment of the application is shown; Figure 10 , the structure schematic diagram of the electric motor in which the bearing outer ring is connected with the stator provided for the embodiment of the application is shown; Figure 11A structural diagram of a positional relationship between a first type of electronic component and a second type of electronic component and an electromagnetic shielding sleeve in an electric motor provided by an embodiment of the present application.

[0080] In the embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 4 , the embodiment of the present application provides an electric motor, which comprises a stator 100, a bearing 200, a rotor 300 and a conductive assembly 400.

[0081] The rotor 300 is configured to be connected with a hub 22 of an electric propulsion device 20, the rotor 300 is connected with a rotating shaft 310, the rotating shaft 310 is rotationally connected with the stator 100 through the bearing 200, and the bearing 200 is insulated from the stator 100.

[0082] The conductive assembly 400 is conductively connected with the bearing 200, and the conductive assembly 400 is configured to lead current transmitted by the hub 22 to the outside of the electric motor.

[0083] In the electric motor of the present application, the stator 100 is provided with a winding 30, the stator 100 comprises a stator cavity, and a motor controller 600, a sensor, a radiator and the like are arranged in the stator cavity, the motor controller 600 comprises various electronic components, and various parts of the stator 100 work cooperatively to realize functions such as magnetic field generation, position feedback and mechanical support.

[0084] The rotor 300 is connected with the hub 22, the hub 22 is provided with a propeller blade 21, the rotor 300 is connected with the rotating shaft 310, and the rotating shaft 310 is rotationally connected with the stator 100 through the bearing 200. The connection between the rotating shaft 310 and the rotor 300 can be understood as: being connected through a connecting piece; or being integrally arranged.

[0085] It should be noted that the electric motor of the embodiment of the present application can be an outer rotor motor, an inner rotor motor or the like.

[0086] The conductive assembly 400 can comprise a conductive lug 410, a conductive wire 420 and an electromagnetic shielding sleeve 430.

[0087] The bearing 200 is insulated from the stator 100, for example, by being insulated from the stator 100 by using an insulating material or an insulating coating. The electrically conductive assembly 400 is electrically connected to the bearing 200, thereby forming an electrically low-impedance path for lightning and static electricity. The electrically low-impedance path includes the blade 21, the hub 22, the rotor 300, the shaft 310, the bearing 200, and the electrically conductive assembly 400. Therefore, the lightning or static electricity on the blade 21 can be conducted to the outside of the electric motor through the hub 22, the rotor 300, the shaft 310, the bearing 200, and the electrically conductive assembly 400. The electric motor of the present application converts the uncertain lightning and static electricity conduction path in the electric motor into a determined low-impedance lightning and static electricity conduction path, thereby enabling the lightning and static electricity to be conducted to the outside of the electric motor through the electrically conductive assembly 400.

[0088] In the electric motor of the present application, the rotor 300 is connected to the hub 22 of the electric propulsion device 20, and the rotor 300 drives the blade 21 on the hub 22 to rotate, thereby achieving propulsion of the electric propulsion device 20. When the aircraft is struck by lightning or static electricity is generated on the blade 21, the current will be transmitted to the hub 22, and the current on the hub 22 will be transmitted to the rotor 300. The rotor 300 is connected to the shaft 310, and the shaft 310 is rotatably connected to the stator 100 through the bearing 200. Therefore, the current on the rotor 300 will be transmitted to the bearing 200. Because the bearing 200 is insulated from the stator 100, the current on the bearing 200 will not be transmitted to the stator 100. Because the electrically conductive assembly 400 is electrically connected to the bearing 200, the electrically conductive assembly 400 can conduct the current on the bearing 200 to the outside of the electric motor, for example, to the skin of the aircraft body 10. Because the electric motor of the present application conducts the current on the bearing 200 to the outside of the electric motor through the electrically conductive assembly 400, and the bearing 200 is insulated from the stator 100, the current on the bearing 200 will not be transmitted to the stator 100, thereby preventing the lightning or static electricity on the blade 21 and the hub 22 from flowing to the stator 100. The electrically conductive assembly 400 conducts the current transmitted by the hub 22 to the outside of the electric motor, thereby protecting the internal components of the electric motor and improving the lightning and static electricity protection effect of the electric motor.

[0089] In other embodiments, the rotor 300 is rotatably arranged outside the stator 100 and forms a rotation gap, and the rotation gap is insulated.

[0090] In this embodiment, because the rotor 300 and bearing 200 are insulated from the stator 100, the current on the rotor 300 and bearing 200 will not be transmitted to the stator 100. Furthermore, because the conductive component 400 is electrically connected to the bearing 200, the conductive component 400 can conduct the current on the bearing 200 to the outside of the electric motor, such as to the skin of the aircraft fuselage 10. Since the electric motor of this application conducts the current on the bearing 200 to the outside of the electric motor through the conductive component 400, and because the rotor 300 and bearing 200 are insulated from the stator 100, the current will not be conducted to the stator 100. The stator 100 is protected against lightning and electrostatic current. Lightning and electrostatic current will not flow through it, and the electromagnetic field generated during the flow of lightning and electrostatic current will not affect the stator 100 or the motor windings 30. This is because the stator 100 contains the windings 30, controllers, etc., thus preventing the lightning and electrostatic current on the blades 21 from affecting the motor windings 30 and controllers. This improves the protection against lightning and electrostatic current in the electric motor, ensuring that the lightning and electrostatic current on the blades 21 will not be transmitted to the stator 100, and therefore will not affect the electric motor, electric propulsion system, or aircraft. Specifically, electrical insulation is achieved by using insulating materials or insulating coatings to cover all small gaps between the rotor 300 and stator 100, and between the magnets 40 and windings 30.

[0091] In some embodiments, reference is made to Figure 4 and Figure 5 As shown, the rotor 300 is rotatably sleeved on the outside of the stator 100, and the shaft 310 is located on the inside of the stator 100. The bearing 200 includes an inner bearing ring 210, an outer bearing ring 220, and a bearing rolling element 230 rotatably disposed between the inner bearing ring 210 and the outer bearing ring 220. The inner bearing ring 210 is connected to the shaft 310, and the outer bearing ring 220 is connected to and insulated from the inside of the stator 100. One end of the conductive component 400 is electrically connected to the outer bearing ring 220, and the other end of the conductive component 400 extends to the outside of the electric motor.

[0092] In this embodiment, the electric motor is an external rotor motor. The inner ring 210 of the bearing is connected to the rotating shaft 310, and the inner ring 210 of the bearing rotates together with the rotating shaft 310. The outer ring 220 of the bearing is insulated and connected to the inner side of the stator 100. The outer ring 220 of the bearing and the stator 100 remain fixed. Since the outer ring 220 of the bearing is insulated and connected to the stator 100, the current in the outer ring 220 of the bearing will not be conducted to the stator 100, thereby ensuring that the current in the entire bearing 200 will not flow to the stator 100.

[0093] Because the conductive assembly 400 is connected with the bearing outer ring 220, the conductive assembly 400 remains fixed and avoids rotating with the bearing inner ring 210, avoiding the conductive assembly 400 being in a moving state, and improving the stability of the conductive assembly 400.

[0094] Because the bearing outer ring 220 is insulatedly connected to the inner side of the stator 100, the current on the bearing outer ring 220 can only flow to the conductive assembly 400, so that at this time, the blade 21, the hub 22, the rotor 300, the rotating shaft 310, the bearing inner ring 210, the bearing rolling element 230, the bearing outer ring 220 and the conductive assembly 400 form an electrically low-impedance path, and the lightning and electrostatic current can be led to the outside of the electric motor through the electrically low-impedance path, so that the current cannot be led to the stator 100, thereby improving the lightning and electrostatic protection effect of the electric motor, and ensuring that the current generated by lightning and electrostatic on the blade 21 cannot be transmitted to the stator 100.

[0095] In some embodiments, as shown in Figure 8 , Figure 9 and Figure 10 , the bearing outer ring 220 is provided with an insulating layer 500 at the connection with the stator 100.

[0096] There are many ways to insulate the connection between the bearing outer ring 220 and the stator 100, such as insulating the bearing 200 mounting chamber on the stator 100 or the bearing outer ring 220. Specifically, the bearing 200 mounting chamber on the stator 100 is made of insulating material, and / or the bearing outer ring 220 is made of insulating material. In this embodiment, an insulating layer 500 is provided at the connection between the bearing outer ring 220 and the stator 100. The specific insulating layer 500 can be insulating glue, insulating coating, ceramic, plastic, rubber, etc.

[0097] It should be noted that Figure 8 , a way of setting the insulating layer 500 is shown, and the amount of the insulating layer 500 is relatively small, and the insulating layer 500 is only provided in the bearing mounting chamber of the stator 100, Figure 9 , another way of setting the insulating layer 500 is shown, and the amount of the insulating layer 500 is relatively large, and the insulating layer 500 extends from the bearing mounting chamber of the stator 100 to the outside of the bearing mounting chamber, which can avoid the outside of the bearing mounting chamber of the stator 100 and the bearing outer ring 220 being in electrical conduction.

[0098] In some possible embodiments, as shown in Figure 4 or Figure 5As shown, the conductive assembly 400 includes a conductive lug 410, a conductive wire 420 and an electromagnetic shielding sleeve 430, the conductive lug 410 is connected with the bearing outer ring 220, and the conductive lug 410 is respectively arranged in insulation between the rotor 300 and the stator 100, one end of the conductive wire 420 is connected with the end of the conductive lug 410 away from the bearing outer ring 220, the other end of the conductive wire 420 extends to the outside of the electric motor, and the electromagnetic shielding sleeve 430 is sleeved outside the conductive wire 420.

[0099] The paddle 21, the paddle hub 22, the rotor 300, the rotating shaft 310, the bearing inner ring 210, the bearing rolling element 230, the bearing outer ring 220 and the conductive assembly 400 form an electrically low-impedance passage, the conductive assembly 400 includes the conductive lug 410, the conductive wire 420 and the electromagnetic shielding sleeve 430, the electromagnetic shielding sleeve 430 has an electromagnetic shielding effect, and when lightning and static electricity flow through the electrically low-impedance passage under the planned lightning and static electricity path, the lightning and static electricity only flow in the path, avoiding the problem that the lightning enters the electric motor in disorder, so that the electric motor faces the problem of performance degradation or direct failure; meanwhile, the lightning and static electricity current is also avoided to be conducted into the electric motor from the power supply and the signal line at the motor end, so that more power electrical equipment is threatened in safety. The lightning and static electricity current does not flow on the stator 100, the conductive assembly 400 makes the electromagnetic field generated in the lightning and static electricity flowing process not affect the winding 30 of the motor, and the electrically low-impedance passage and the insulation treatment at the small gap also avoid the possibility of breakdown conduction from the small gap as much as possible, so that the lightning and static electricity current on the paddle 21 does not affect the electric motor, the electric propulsion device and the aircraft.

[0100] In the embodiment, the conductive wire 420 is arranged inside the electromagnetic shielding sleeve 430, so that the current of the conductive wire 420 does not cause electromagnetic interference to the electronic elements on the electric motor, and the electromagnetic field generated when the lightning and static electricity conduct on the conductive wire 420 has as little influence as possible on the space inside the electric motor and outside the electromagnetic shielding sleeve 430. The high-performance integrated motor controller 600 and the like are often installed in the interior of the electric motor, are sensitive to the strong electromagnetic field generated by lightning, and are easy to lose function in a strong electromagnetic environment, and in the embodiment, the conductive wire 420 is arranged inside the electromagnetic shielding sleeve 430, so that the lightning and static electricity do not affect the controller and other electronic elements in the motor when flowing.

[0101] It should be noted that the insulation between the conductive ear 410 and the rotor 300 can be achieved by providing a gap between the conductive ear 410 and the rotor 300, so that the conductive ear 410 and the rotor 300 are not in contact, forming an insulation distance, so that the conductive ear 410 and the rotor 300 are insulated; or an insulation layer 500 can be provided between the conductive ear 410 and the rotor 300, which can prevent the current of the conductive ear 410 from being conducted to the rotor 300, wherein the insulation layer 500 can be insulating glue, insulating coating, ceramic, plastic, rubber, etc.

[0102] The insulation between the conductive ear 410 and the stator 100 can be achieved by providing a gap between the conductive ear 410 and the stator 100, so that the conductive ear 410 and the stator 100 are not in contact, forming an insulation distance, so that the conductive ear 410 and the stator 100 are insulated; or an insulation layer 500 can be provided between the conductive ear 410 and the stator 100, which can prevent the current of the conductive ear 410 from being conducted to the stator 100, wherein the insulation layer 500 can be insulating glue, insulating coating, ceramic, plastic, rubber, etc.

[0103] The conductive wire 420 can be a metal wire with an insulating coating, which achieves the insulation effect of the metal wire and the electromagnetic shielding sleeve 430; the conductive wire 420 can also be directly selected as a metal wire, and an insulation layer needs to be additionally provided between the metal wire and the electromagnetic shielding sleeve 430 when the conductive wire 420 is a metal wire.

[0104] In another embodiment, as shown in Figure 7 , Figure 8 , Figure 9 and Figure 10 , the conductive assembly 400 further includes a conductive ring 450, the conductive ring 450 is coaxial with the bearing outer ring 220, and the conductive ring 450 is conductively connected with the bearing outer ring 220, the conductive ring 450 is insulated from the stator 100, and the conductive ear 410 is conductively connected with the conductive ring 450 or is integrally provided.

[0105] In this embodiment, the conductive ring 450 can be coaxial with the bearing outer ring 220 in the following ways: the conductive ring 450 is sleeved on the outer sidewall of the bearing outer ring 220, the conductive ring 450 is arranged at the bottom of the bearing outer ring 220, the conductive ring 450 is arranged at the top of the bearing outer ring 220, and the conductive ring 450 wraps the bearing outer ring 220.

[0106] In another embodiment, as shown in Figure 10 , the conductive ring 450 is sleeved on the bearing outer ring 220.

[0107] In this embodiment, the contact area between the conductive ring 450 and the outer ring 220 of the bearing is increased, thereby enhancing the conductivity and ensuring that the current in the outer ring 220 of the bearing can be guided to the conductive component 400 through the conductive ring 450.

[0108] In another embodiment, reference Figure 8 As shown, the conductive ring 450 is disposed at the bottom of the bearing outer ring 220, and the conductive ring 450 is coaxially disposed with the bearing outer ring 220.

[0109] In this embodiment, the contact area between the conductive ring 450 and the bearing outer ring 220 is also ensured to be large enough, thereby enhancing the conductivity between the conductive ring 450 and the bearing outer ring 220.

[0110] In other embodiments, refer to Figure 8 , Figure 9 and Figure 10 As shown, an insulating layer 500 is provided at the connection between the conductive ring 450 and the stator 100.

[0111] In this embodiment, the insulation between the conductive ring 450 and the stator 100 can be achieved by providing insulating adhesive, insulating coating, ceramic, plastic, rubber, or other materials between the conductive ring 450 and the stator 100, thereby preventing the current on the conductive ring 450 from flowing to the stator 100.

[0112] The conductive ring 450 and the conductive lug 410 can be separate parts or integrally formed. When they are separate parts, they can be connected together by welding or other methods.

[0113] In some embodiments, the conductive ring 450 and the conductive lug 410 are integrally formed or separately formed.

[0114] In this embodiment, when the conductive ring 450 and the conductive lug 410 are integrally formed, the structural strength of the conductive ring 450 and the conductive lug 410 is improved, preventing the conductive ring 450 and the conductive lug 410 from separating and thus failing to conduct electricity, thereby ensuring the stability of conductivity. The conductive ring 450 and the conductive lug 410 can be separate components; when they are formed separately, they can be connected together by welding or other methods.

[0115] In one embodiment, reference is made to... Figure 4 or Figure 5 As shown, the conductive lug 410 extends from the end of the bearing outer ring 220 away from the connection end toward the side near the rotation center line of the rotor 300.

[0116] In this embodiment, the conductive lug 410 is prevented from contacting the stator 100, thus creating an insulating distance between the conductive lug 410 and the stator 100.

[0117] In another possible embodiment, the electrically conductive lug 410 is provided with an insulating layer 500 on the side close to the stator 100, and / or the electrically conductive lug 410 is provided with an insulating layer 500 on the side close to the rotor 300.

[0118] In the present embodiment, the current of the electrically conductive lug 410 is prevented from being conducted to the stator 100, and / or the current of the electrically conductive lug 410 is prevented from being conducted to the rotor 300, wherein the insulating layer 500 can be insulating glue, insulating coating, ceramic, plastic, rubber, etc.

[0119] In another embodiment, an insulating gap is provided between the electrically conductive lug 410 and the rotor 300.

[0120] In the present embodiment, as shown in Figure 4 or Figure 5 , because of the insulating gap between the electrically conductive lug 410 and the rotor 300, the current on the electrically conductive lug 410 can be further prevented from being conducted to the rotor 300.

[0121] In another embodiment, an insulating gap is provided between the electrically conductive lug 410 and the stator 100.

[0122] In the present embodiment, as shown in Figure 4 or Figure 5 , because of the insulating gap between the electrically conductive lug 410 and the stator 100, the current on the electrically conductive lug 410 can be further prevented from being conducted to the stator 100.

[0123] In other possible embodiments, as shown in Figure 4 or Figure 5 , the motor controller 600 is further included, the motor controller 600 comprises a controller mounting plate, the stator 100 comprises a stator cavity, and the motor controller 600 is at least partially arranged in the stator cavity; the controller mounting plate is provided with a controller through hole 610, the electrically conductive assembly 400 is arranged through the controller through hole 610 and extends to the outside of the electric motor, and / or the electrically conductive assembly 400 passes through the stator cavity and extends to the outside of the electric motor.

[0124] In the present embodiment, the controller mounting plate can be a circuit board or other plate structure, and the controller mounting plate is used to mount various electronic components. The strength of the controller mounting plate structure inside the motor controller 600 is not high, and when a plurality of electronic components are arranged, there is a risk of deformation or fracture. In the present embodiment, the electrically conductive assembly 400 is arranged through the controller through hole 610, which can be arranged on the circuit board. The electrically conductive assembly 400 and the circuit board can be insulatively connected, and the circuit board is reinforced and supported by the electrically conductive assembly 400, thereby improving the strength of the circuit board and the motor controller 600.

[0125] Therefore, in the present application, the electrically conductive assembly 400 can be led out to the outside of the electric motor through the controller through-hole 610, realizing effective use of the space of the electric motor. On the other hand, the electrically conductive assembly 400 can be used to form a reinforcing support effect on the motor controller 600. At the same time, the electrically conductive assembly 400 passing through the stator cavity can also form a reinforcing support effect on the stator cavity, improving the structural strength of the stator 100.

[0126] In another embodiment, the extension direction of the electrically conductive wire 420 of the electrically conductive assembly 400 in the stator cavity is parallel to the rotation axis of the rotor 300.

[0127] In some embodiments, as shown in Figure 4 , Figure 5 and Figure 11 , the motor controller 600 further includes first electronic components 700 and second electronic components 800, the electromagnetic sensitivity of the first electronic components 700 is higher than that of the second electronic components 800; the distance between the first electronic components 700 and the controller through-hole 610 is greater than the distance between the second electronic components 800 and the controller through-hole 610.

[0128] In the present embodiment, because the deposited static electricity and lightning have some low-frequency energy, the electronic and electrical components outside the electromagnetic shielding sleeve 430 need to be arranged outside a certain range outside the electromagnetic shielding sleeve 430.

[0129] Specifically, the distance between the first electronic components 700 and the controller through-hole 610 is greater than the distance between the second electronic components 800 and the controller through-hole 610. The specific distance can be obtained by simulation calculation.

[0130] In the calculation, the electromagnetic interference is designed according to the first electronic components 700, the maximum distance value of the first electronic components 700 that can be disturbed is calculated by simulation, which is the first preset distance value; the electromagnetic interference is designed according to the second electronic components 800, the maximum distance value of the second electronic components 800 that can be disturbed is calculated by simulation, which is the second preset distance value; at this time, the first electronic components 700 are outside the range of the first preset distance value, and the second electronic components 800 are outside the range of the second preset distance value.

[0131] As shown in Figure 11 , the range surrounded by the second preset distance value is the second preset range 810, and the second electronic components 800 are outside the second preset range 810.

[0132] It should be noted that the range of the first preset distance value and the second preset distance value includes not only the horizontal range, but also the spatial range.

[0133] In this embodiment, by reducing the impact of lightning electrostatic current conduction on electrical equipment such as the first type of electronic component 700 and the second type of electronic component 800 inside the motor, the structure of the electric motor and the first type of electronic component 700 and the second type of electronic component 800, as well as the motor controller 600, inside the electric motor are not subject to electromagnetic interference when lightning and electrostatic current are conducted in the electric motor.

[0134] In other embodiments, a motor rear cover 110 and a stator support are also included. The motor rear cover 110 and the stator support are connected to form a stator cavity. The motor rear cover 110 has a motor rear cover through hole. The conductive component 400 passes through the controller through hole 610 and the motor rear cover through hole and extends to the outside of the electric motor.

[0135] In this embodiment, the conductive component 400 passes through the through hole of the motor rear cover and leads to the outside of the electric motor. The motor rear cover 110 can also support and protect the conductive component 400.

[0136] It should be noted that the conductive component 400 can pass through the controller through hole 610 and lead to the outside of the electric motor, or it can pass through the motor rear cover 110 and lead to the outside of the electric motor, or the conductive component 400 can pass through both the controller through hole 610 and the motor rear cover 110 and lead to the outside of the electric motor. The motor controller 600 and the stator bracket serve to support and protect the conductive component 400, preventing damage to the conductive component 400 and ensuring the stability of the low-impedance electrical path.

[0137] In another embodiment, reference Figure 6 As shown, the conductive component 400 includes a conductive lug 410 and a conductive wire 420. The stator 100 includes a stator support, on which an electromagnetic shielding channel 900 is provided. The conductive component 400 is insulated from the electromagnetic shielding channel 900. One end of the electromagnetic shielding channel 900 is located on the side of the stator support near the outer ring 220 of the bearing, and the other end of the electromagnetic shielding channel 900 extends to the outside of the electric motor. One end of the conductive lug 410 is connected to the outer ring 220 of the bearing, and the other end of the conductive lug 410 extends into the electromagnetic shielding channel 900 and is insulated from the electromagnetic shielding channel 900. One end of the conductive wire 420 is connected to the conductive lug 410, and the other end of the conductive wire 420 passes through the electromagnetic shielding channel 900 and extends to the outside of the electric motor.

[0138] In the embodiment, the electromagnetic shielding channel 900 is arranged on the stator support, the channel penetrates through the stator support, the conductive wire 420 is arranged in the electromagnetic shielding channel 900, the electromagnetic shielding channel 900 has the function of electromagnetic shielding, and the conductive assembly 400 can avoid affecting and interfering with the controller. The conductive assembly 400 and the electromagnetic shielding channel 900 can prevent lightning and static electricity current from flowing on the stator, and the electromagnetic field generated in the lightning and static electricity flowing process does not affect the winding 30 of the motor, so that the lightning and static electricity current on the blade 21 does not affect the electric motor, the electric propulsion device and the aircraft.

[0139] In the embodiment, the conductive assembly 400 penetrates the electromagnetic shielding channel 900, and the electromagnetic shielding channel 900 forms a reinforcing structure, thereby improving the strength of the electromagnetic shielding channel 900 and the stator support.

[0140] Therefore, in the application, the conductive assembly 400 can be led out to the outside of the electric motor through the electromagnetic shielding channel 900, thereby effectively utilizing the space of the electric motor. On the other hand, the conductive assembly 400 can form a reinforcing effect on the stator support.

[0141] It should be noted that the conductive wire 420 can be a metal wire with an insulating coating, and the insulating coating can achieve the insulation effect between the metal wire and the electromagnetic shielding channel 900. Alternatively, the conductive wire 420 can be directly a metal wire, and an insulating layer is additionally arranged between the metal wire and the electromagnetic shielding sleeve 430.

[0142] Further, the insulation between the conductive ear 410 and the electromagnetic shielding channel 900 can be achieved by arranging an insulating gap between the conductive ear 410 and the electromagnetic shielding channel 900, or by arranging an insulating layer 500 between the conductive ear 410 and the electromagnetic shielding channel 900. The insulating layer 500 can be insulating glue, insulating coating, ceramic, plastic, rubber, etc.

[0143] It should be noted that the electromagnetic shielding channel 900 can also be arranged on the strength reinforcing support structure of the motor controller 600 and the like.

[0144] In some possible embodiments, the motor controller 600 is further included, at least part of the motor controller 600 is arranged inside the stator support, the first type of electronic element 700 and the second type of electronic element 800 are arranged in the motor controller 600, the electromagnetic sensitivity of the first type of electronic element 700 is higher than that of the second type of electronic element 800, the distance between the first type of electronic element 700 and the electromagnetic shielding channel 900 is greater than the distance between the second type of electronic element 800 and the electromagnetic shielding channel 900, and / or the electromagnetic shielding channel 900 forms a reinforcing rib of the stator support.

[0145] In the embodiment, because the deposition static electricity and lightning have partial low frequency energy, the electronic and electrical components outside the electromagnetic shielding channel 900 need to be arranged outside a certain range of the electromagnetic shielding channel 900.

[0146] Specifically, the distance between the first type of electronic components 700 and the electromagnetic shielding channel 900 is greater than the distance between the second type of electronic components 800 and the electromagnetic shielding channel 900. The specific distance can be calculated by simulation, which is not described here.

[0147] And the electromagnetic shielding channel 900 forms a reinforcing rib of the stator support, which strengthens and reinforces the stator support, improving the strength and stiffness of the stator support.

[0148] In some embodiments, conductive grease is provided between the bearing inner ring 210 and the bearing rolling element 230, and / or between the bearing outer ring 220 and the bearing rolling element 230.

[0149] In the embodiment, by providing conductive grease between the bearing inner ring 210 and the bearing rolling element 230, and / or between the bearing outer ring 220 and the bearing rolling element 230, the electrical conductivity between the bearing inner ring 210 and the bearing rolling element 230 and / or between the bearing outer ring 220 and the bearing rolling element 230 is enhanced, so that the electrical low impedance path formed by the blade 21, the hub 22, the rotor 300, the shaft 310, the bearing inner ring 210, the bearing rolling element 230, the bearing outer ring 220 and the conductive assembly 400 is increased in electrical conductivity, so that the lightning and static electricity current can be led to the outside of the electric motor through the electrical low impedance path, avoiding the current flowing to the stator 100.

[0150] In another embodiment, referring to Figure 4 or Figure 5 It also includes a terminal 440, and the conductive wire 420 is connected to the conductive lug 410 through the terminal 440.

[0151] In the embodiment, the conductive wire 420 and the conductive lug 410 are connected through the terminal 440, and the terminal 440 has low resistance, which ensures efficient current transmission.

[0152] Specifically, the terminal 440 includes an insulating shell, a conductive current-carrying element and a wire clamping mechanism, the conductive current-carrying element and the wire clamping mechanism are arranged in the insulating shell, the wire clamping mechanism is arranged at both ends of the conductive current-carrying element, the wire clamping mechanism at one end of the conductive current-carrying element is connected to the conductive lug 410, and the wire clamping mechanism at the other end of the conductive current-carrying element is connected to the conductive wire 420, and the wire clamping mechanism ensures the stability of the conductive communication between the conductive wire 420 and the conductive lug 410.

[0153] In another possible embodiment, the material of the electromagnetic shielding sleeve 430 comprises any one of copper, aluminum, silver and nickel.

[0154] The electromagnetic shielding sleeve 430 is used to isolate or attenuate the electromagnetism of the conductive wire 420 inside the electromagnetic shielding sleeve 430, avoid the electromagnetic interference of the conductive wire 420 inside the electromagnetic shielding sleeve 430 to the electronic components outside the electromagnetic shielding sleeve 430, and the material of the electromagnetic shielding sleeve 430 can be metal materials, conductive composite materials, fabrics and flexible materials, nanomaterials, etc., such as aluminum, aluminum alloy, steel, metal mesh, metal foil, conductive rubber, metal fiber blended fabric, conductive paint, carbon nanotubes, etc.

[0155] In the embodiment, the material of the electromagnetic shielding sleeve 430 is copper, such as the electromagnetic shielding sleeve 430 is a copper pipe. The shielding effectiveness of the copper pipe is high, and the applicable frequency is full frequency band, so as to ensure no leakage shielding and ensure that the electronic components in the stator 100 are not interfered.

[0156] In another embodiment, the material of the electromagnetic shielding sleeve 430 is an electromagnetic shielding composite material.

[0157] The electromagnetic shielding composite material mainly consists of two parts of a matrix material and a functional filler, the matrix material can be a polymer resin, and the functional filler can be metal, carbon-based materials, etc.

[0158] The second aspect of the embodiment of the application provides an electric propulsion device 20, referring to Figure 2 and Figure 3 The electric propulsion device 20 comprises a paddle 21, a paddle hub 22 and the electric motor of any embodiment described above.

[0159] The paddle hub 22 is conductively connected to the paddle 21.

[0160] The paddle hub 22 is connected to the rotor 300 of the electric motor.

[0161] The electric propulsion device 20 of the application has the electric motor of the embodiment of the application, the electric motor of the embodiment of the application comprises a stator 100, a bearing 200, a rotor 300 and a conductive assembly 400; the rotor 300 is rotatably sleeved on the outside of the stator 100, the rotor 300 is used to be connected with the paddle hub 22 of the electric propulsion device 20, the rotor 300 is connected to a rotating shaft 310, at least part of the rotating shaft 310 is rotatably connected to the inside of the stator 100 through the bearing 200, and the rotor 300 and the bearing 200 are respectively insulated from the stator 100; the conductive assembly 400 is conductively connected with the bearing 200, and the conductive assembly 400 is used to transmit the current transmitted by the paddle hub 22 to the outside of the electric motor.

[0162] In the electric propulsion device 20 of the present application, the rotor 300 is connected with the hub 22 of the electric propulsion device 20, and the rotor 300 drives the blades 21 on the hub 22 to rotate, thereby realizing the propulsion of the electric propulsion device 20. When the aircraft is struck by lightning or static electricity is generated on the blades 21, causing the blades 21 to have current, the current will be transmitted to the hub 22, and the current on the hub 22 will be transmitted to the rotor 300. The rotor 300 is connected with the shaft 310, and the shaft 310 is rotatably connected with the stator 100 through the bearing 200, so that the current on the rotor 300 will be transmitted to the bearing 200. Because the bearing 200 is insulated from the stator 100, the current on the bearing 200 will not be transmitted to the stator 100. Because the electrically conductive assembly 400 is in conductive connection with the bearing 200, the electrically conductive assembly 400 can lead the current on the bearing 200 to the outside of the electric motor, such as to the skin of the aircraft body 10. Because the electric motor of the present application leads the current on the bearing 200 to the outside of the electric motor through the electrically conductive assembly 400, and the bearing 200 is insulated from the stator 100, so that the current on the bearing 200 will not be transmitted to the stator 100, that is, it is ensured that the lightning and static electricity current on the blades 21 and the hub 22 will not flow to the stator 100, and the electrically conductive assembly 400 plays a role in guiding the lightning and static electricity current. The electrically conductive assembly 400 leads the current transmitted by the hub 22 to the outside of the electric motor, thereby protecting the internal parts of the electric motor, and improving the protection effect of the electric motor against lightning and static electricity.

[0163] In other embodiments, referring to FIG. 1, the electric propulsion device 20 further comprises a pitch changing mechanism 23 connected with the blade root of the blades 21 and the hub 22. Figure 3 The pitch changing mechanism 23 is insulated from the blade root and the hub 22.

[0164] The pitch changing mechanism 23 in the electric propulsion device 20 adjusts the pitch angle (i.e., the angle between the blades 21 and the rotation plane) of the blades 21 dynamically to adapt to the aerodynamic requirements of different flight stages.

[0165] In the present embodiment, the pitch changing mechanism 23 is insulated from the blade root and the hub 22, so that the current on the blades 21 and the hub 22 can be prevented from flowing into the pitch changing mechanism 23.

[0166] The specific insulation arrangement can be that electrically insulating parts are used at the connection parts, or an insulation layer 500 is arranged at the connection parts, such as coating an insulating coating, arranging insulating glue, etc.

[0167] The third aspect of the present application provides an aircraft comprising an aircraft body 10 and an electric motor according to any of the embodiments described above, or an electric propulsion device 20 according to any of the embodiments described above.

[0168] The outer covering skin of the fuselage 10 is a conductive member.

[0169] The conductive assembly 400 of the electric motor is conductively connected with the skin.

[0170] An aircraft is provided in the embodiments of the present application, as shown in Figure 1 The aircraft can be an electric vertical take-off and landing (eVTOL) aircraft, of course, it can also be other aircraft.

[0171] Figure 1 A schematic diagram of an aircraft is provided in the embodiments of the present application. Among them, Figure 1 The aircraft shown is only for illustration and does not constitute a limitation on the specific structure and shape of the aircraft.

[0172] As shown in Figure 1 The aircraft includes a fuselage 10, a wing 11 and a tail 12. Among them, the fuselage 10 is a symmetrical structure, the wing 11 is fixedly connected to the fuselage 10, the tail 12 is arranged at the tail of the fuselage 10, the tail 12 is integrally formed with or mechanically connected to the fuselage 10, and is a symmetrical structure. The structure of the tail 12 can also refer to the structure of the tail 12 of the existing aircraft, which will not be described here.

[0173] It should be noted that in some scenarios, the aircraft can also include the fuselage 10 and the wing 11, i.e. the aircraft does not include the tail 12.

[0174] As shown in Figure 1 The aircraft further includes an electric propulsion device 20, which can be used to provide power for the aircraft. The number of electric propulsion devices 20 is one or more electric propulsion devices 20, for example Figure 1 As shown, eight electric propulsion devices 20 are arranged on the aircraft.

[0175] The electric propulsion device 20 is arranged on the fuselage 10 and / or the wing 11 and / or the tail 12, as shown in Figure 1 The wing 11 and the tail 12 are symmetrically provided with electric propulsion devices 20.

[0176] As shown in Figure 1 Figure 1 The aircraft further includes a wing 13 and / or a short cabin 14, which are used to be connected with the electric propulsion device 20 to arrange the electric propulsion device 20 on the fuselage 10, the wing 11 or the tail 12.

[0177] In the aircraft of the embodiment of the present application, due to the electric motor comprising the electric motor of any of the above embodiments or the electric propulsion device 20 of any of the above embodiments, the electric motor in the aircraft of the present application guides the current on the bearing 200 to the outside of the electric motor through the conductive assembly 400, and the bearing 200 is insulated from the stator 100, so that the current on the bearing 200 cannot be transmitted to the stator 100. In addition, the conductive assembly 400 is in conductive connection with the bearing 200, so that the conductive assembly 400 can guide the current on the bearing 200 to the outside of the electric motor, such as to the skin of the aircraft body 10. Since the electric motor of the present application guides the current on the bearing 200 to the outside of the electric motor through the conductive assembly 400, and the bearing 200 is insulated from the stator 100, so that the current on the bearing 200 cannot be guided to the stator 100, that is, the lightning and static current on the blades 21 and the hub 22 cannot flow to the stator 100, and the conductive assembly 400 plays a role in guiding the lightning and static current, and the conductive assembly 400 guides the current transmitted by the hub 22 to the outside of the electric motor, thereby protecting the internal parts of the electric motor and improving the protection effect of the electric motor against lightning and static electricity.

[0178] In the embodiment, the conductive assembly 400 finally guides the current to the skin, and a Faraday cage effect is formed on the skin to protect the electric motor, the electric propulsion device 20 and the internal electrical components of the aircraft.

[0179] In the embodiment, the electrically low-impedance path formed by the hub 22, the rotor 300, the shaft 310, the bearing 200 and the conductive assembly 400 directly conducts the lightning attached to the blades 21 and the static electricity deposited on the blades 21 to the aircraft skin. The blades 21 and the aircraft body 10 have the same electric potential, so as to avoid forming a potential difference between the aircraft body 10 and the blades 21, and to avoid the rapid increase of the voltage of the blades 21 due to the continuous increase of the deposited static electricity, thereby reducing the probability of lightning being attached to the blades 21 due to the deposition of static electricity when the aircraft is struck by lightning. At the same time, the protection method is different from the carbon brush and the high-current conductive slip ring, and special inspection and maintenance is not required, and the inspection and maintenance can be performed together with the electric motor when lightning strikes. The electric motor proposed in the present application conducts the lightning and static electricity on the front hub 22 of the rotor 300 to the skin of the aircraft through the reliable contact-type electrically low-impedance and low-electromagnetic-interference channel in the motor, thereby solving the problem of the failure of the electric motor when lightning is attached to the blades 21 of the electric propulsion device 20 after the aircraft is struck by lightning, and providing an effective path for the static electricity discharge of the electric motor, thereby reducing the probability of the electro-erosion of the bearing 200 of the electric motor due to static electricity.

[0180] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application be construed as including any patern, process, method, technique, composition of matter, or device directly or indirectly

[0181] It is to be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that various changes in form and detail can be made therein without departing from the scope thereof. The scope of the application should only be limited by the appended claims.

Claims

1. An electric motor characterized by, The application relates to an electric propulsion device (20) comprising: a stator (100); a bearing (200); a rotor (300) configured to be connected with a hub (22) of the electric propulsion device (20), the rotor (300) being connected with a rotating shaft (310), the rotating shaft (310) being rotatably connected with the stator (100) through the bearing (200), and the bearing (200) and the stator (100) being insulated from each other; an electrically-conductive assembly (400) electrically connected with the bearing (200), the electrically-conductive assembly (400) being configured to guide an electric current transmitted by the hub (22) to an outside of the electric motor; the rotor (300) is rotatably arranged outside the stator (100), the rotating shaft (310) is located inside the stator (100), the bearing (200) comprises a bearing inner ring (210), a bearing outer ring (220) and a bearing rolling element (230) rotatably arranged between the bearing inner ring (210) and the bearing outer ring (220), the bearing inner ring (210) is connected with the rotating shaft (310), the bearing outer ring (220) is connected with an inner side of the stator (100) and is insulated therefrom; one end of the electrically-conductive assembly (400) is electrically connected with the bearing outer ring (220), and the other end of the electrically-conductive assembly (400) extends to the outside of the electric motor.

2. The motorized engine of claim 1, wherein, The rotor (300) is rotatably arranged outside the stator (100) and forms a rotating gap, and the rotating gap is insulated.

3. The motorized engine of claim 1, wherein, An insulating layer (500) is arranged at a connection position of the bearing outer ring (220) and the stator (100).

4. The motorized engine of claim 1, wherein, The electrically-conductive assembly (400) comprises an electrically-conductive lug (410), an electrically-conductive wire (420) and an electromagnetic shielding sleeve (430), the electrically-conductive lug (410) is connected with the bearing outer ring (220), and the electrically-conductive lug (410) is insulated from the rotor (300) and the stator (100) respectively, one end of the electrically-conductive wire (420) is connected with an end of the electrically-conductive lug (410) away from the bearing outer ring (220), the other end of the electrically-conductive wire (420) extends to the outside of the electric motor, and the electromagnetic shielding sleeve (430) is arranged outside the electrically-conductive wire (420).

5. The motorized engine of claim 4, wherein, The electrically-conductive assembly (400) further comprises an electrically-conductive ring (450), the electrically-conductive ring (450) is coaxial with the bearing outer ring (220), the electrically-conductive ring (450) is electrically connected with the bearing outer ring (220), the electrically-conductive ring (450) is insulated from the stator (100), and the electrically-conductive lug (410) is electrically connected with the electrically-conductive ring (450) or is integrally arranged with the electrically-conductive ring (450).

6. The motorized engine of claim 4, wherein, The other end of the electrically-conductive lug (410) away from the connection end of the bearing outer ring (220) extends towards a side close to a rotating center line of the rotor (300).

7. The motorized engine of claim 4, wherein, The conductive ear (410) is provided with an insulating layer (500) on the side close to the stator (100), and / or the conductive ear (410) is provided with an insulating layer (500) on the side close to the rotor (300).

8. The motorized engine of claim 4, wherein, Further comprising a motor controller (600), the motor controller (600) comprises a controller mounting plate, the stator (100) comprises a stator cavity, and the motor controller (600) is at least partially arranged in the stator cavity; The controller mounting plate is provided with a controller through hole (610), the conductive assembly (400) is arranged through the controller through hole (610) and extends to the outside of the electric motor, and / or the conductive assembly (400) passes through the stator cavity and extends to the outside of the electric motor.

9. The motorized engine of claim 8, wherein, The motor controller (600) further comprises first type electronic components (700) and second type electronic components (800), the electromagnetic sensitivity of the first type electronic components (700) is higher than that of the second type electronic components (800); The distance between the first type electronic components (700) and the controller through hole (610) is greater than the distance between the second type electronic components (800) and the controller through hole (610).

10. The motorized engine of claim 8, wherein, Further comprising a motor rear cover (110) and a stator support, the motor rear cover (110) is connected with the stator support to form the stator cavity, the motor rear cover (110) has a motor rear cover through hole, and the conductive assembly (400) is arranged through the controller through hole (610) and the motor rear cover through hole and extends to the outside of the electric motor.

11. The motorized engine of claim 1, wherein, The conductive assembly (400) comprises a conductive ear (410) and a conductive wire (420), the stator (100) comprises a stator support, the stator support is provided with an electromagnetic shielding channel (900), the conductive assembly (400) is arranged in insulation with the electromagnetic shielding channel (900), one end of the electromagnetic shielding channel (900) is located on the side of the stator support close to the bearing outer ring (220), and the other end of the electromagnetic shielding channel (900) extends to the outside of the electric motor. One end of the conductive ear (410) is connected with the bearing outer ring (220), the other end of the conductive ear (410) extends into the electromagnetic shielding channel (900) and is arranged in insulation with the electromagnetic shielding channel (900), one end of the conductive wire (420) is connected with the conductive ear (410), and the other end of the conductive wire (420) extends to the outside of the electric motor through the electromagnetic shielding channel (900).

12. The motorized engine of claim 11, wherein, Further comprising a motor controller (600), at least part of the motor controller (600) is arranged inside the stator support; The motor controller (600) is provided with first type electronic components (700) and second type electronic components (800), the electromagnetic sensitivity of the first type electronic components (700) is higher than that of the second type electronic components (800); The first type of electronic component (700) is farther away from the electromagnetic shielding channel (900) than the second type of electronic component (800) is from the electromagnetic shielding channel (900); and / or the electromagnetic shielding channel (900) is configured as a reinforcing rib of the stator support.

13. The motorized engine of claim 1, wherein, An electrically conductive lubricant is provided between the bearing inner ring (210) and the bearing rolling element (230), and / or between the bearing outer ring (220) and the bearing rolling element (230).

14. An electric propulsion device, characterized by Comprising: a blade (21); a hub (22) electrically conductively connected to the blade (21); The electric motor according to any one of claims 1 to 13, wherein the hub (22) is connected to a rotor (300) of the electric motor.

15. The electric propulsion device according to claim 14, characterized in that Further comprising a pitch changing mechanism (23) connected to a blade root of the blade (21) and to the hub (22); The pitch changing mechanism (23) is insulated from the blade root and from the hub (22).

16. An aircraft, characterized in that Comprising: an airframe (10) having an outer covering skin, the skin being an electrically conductive member; The electric motor according to any one of claims 1 to 13; or the electric propulsion device (20) according to claim 14 or 15; wherein The electrically conductive component (400) of the electric motor is electrically conductively connected to the skin.

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