Electric drive system and aircraft

Abstract

The invention provides an electric driving system and an aircraft, the electric driving system comprises a motor assembly, the motor assembly comprises a stator base, the stator base is provided with a rotor assembly and a stator assembly, the rotor assembly comprises a rotating shaft, the stator assembly is located at the outer side of the rotating shaft, the stator base is provided with a motor flow channel structure, and the motor flow channel structure is provided with a motor flow channel; the motor runner structure is arranged between the rotating shaft and the stator assembly; the controller assembly is located at the bottom of the motor assembly, the controller assembly is connected with the motor assembly, the controller assembly comprises a controller shell, a controller flow channel structure is arranged in the controller shell, and the controller flow channel structure communicates with the motor flow channel structure; and the cooling assembly is used for cooling at least one of the motor assembly and the controller assembly. The problem that in the prior art, an electric drive system is low in heat dissipation efficiency is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive system structure design, and in particular to an electric drive system and an aircraft. Background Art

[0002] Existing electric drive systems are usually equipped with cooling devices to cool the motors, but the cooling devices usually do not take into account the cooling requirements of the motor controllers, and also have the defects of complex structure and low cooling efficiency. Furthermore, existing electric drive systems also have the problems of low integration and low power density. Summary of the invention

[0003] The main purpose of the present invention is to provide an electric drive system and an aircraft to solve the problem of low heat dissipation efficiency of the electric drive system in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an electric drive system, comprising: a motor assembly, the motor assembly comprising a stator base, a rotor assembly and a stator assembly are mounted on the stator base, the rotor assembly comprises a rotating shaft, the stator assembly is located on the outside of the rotating shaft, a motor flow channel structure is arranged on the stator base, and the motor flow channel structure is arranged between the rotating shaft and the stator assembly; a controller assembly, the controller assembly is located at the bottom of the motor assembly, the controller assembly is connected to the motor assembly, the controller assembly comprises a controller housing, a controller flow channel structure is arranged in the controller housing, and the controller flow channel structure is communicated with the motor flow channel structure; a cooling assembly, the cooling assembly is connected to the controller assembly, the cooling assembly comprises a heat exchanger, and the internal flow channel of the heat exchanger is communicated with the controller flow channel structure, wherein the cooling assembly is used to perform cooling operations on at least one of the motor assembly and the controller assembly.

[0005] Furthermore, a first annular structure and a second annular structure are provided on the stator base, the first annular structure forms a stator mounting groove for installing the stator assembly, and along the radial direction of the stator base, the stator mounting groove is located on the outside of the rotating shaft, the second annular structure is located on the inner side of the first annular structure, and the interior of the second annular structure forms a motor flow channel structure.

[0006] Furthermore, the second annular structure is an annular groove having an opening on one side, and the annular groove has an opening on the side facing away from the controller assembly. The motor assembly also includes a water channel sealing plate, which is located at the top of the annular groove and connected to the stator base. The water channel sealing plate is used to seal the opening so that a motor flow channel structure is formed between the side wall of the annular groove and the water channel sealing plate.

[0007] Furthermore, the first annular structure and the second annular structure share a side wall.

[0008] Furthermore, a control circuit board is disposed in the controller assembly, and the controller flow channel structure is located at the bottom of the control circuit board. The controller flow channel structure is a cavity flow channel disposed in the controller housing.

[0009] Furthermore, when projected along the thickness direction of the controller assembly, the flow channel structure of the controller is polygonal, the controller assembly is circular, and each vertex of the polygon is connected to the circle.

[0010] Furthermore, the cooling assembly is arranged at the bottom of the controller assembly, and the central axis of the motor assembly, the central axis of the controller assembly and the geometric center line of the cooling assembly are arranged to coincide with each other.

[0011] Furthermore, the motor assembly also includes a rotor turntable and a rotor sleeve. The rotor turntable is connected to the rotating shaft. The rotor turntable is located on the top of the stator base. The rotor turntable is connected to the stator base. The rotor sleeve is arranged between the rotor turntable and the stator base. The rotor sleeve has a supporting portion for supporting at least one of the magnetic steel and the rotor core.

[0012] Furthermore, one end of the rotor sleeve close to the rotor disc abuts against the rotor disc via a first step surface.

[0013] Furthermore, a plurality of first mating protrusions are formed at one end of the rotor sleeve away from the rotor turntable, the plurality of first mating protrusions are arranged at radial intervals along the rotor sleeve, and first mating grooves are formed between adjacent first mating protrusions, and a plurality of second mating protrusions are arranged at one end of the stator base close to the rotor sleeve, the plurality of second mating protrusions are arranged at radial intervals along the stator base, and second mating grooves are formed between adjacent second mating protrusions, wherein the plurality of first mating protrusions and the plurality of second mating protrusions are staggered, the plurality of first mating protrusions correspond to the plurality of second mating grooves and the plurality of second mating protrusions correspond to the plurality of first mating grooves, so that a labyrinth sealing structure is formed between the rotor sleeve and the stator base.

[0014] Furthermore, the motor assembly includes a protective cover, which is located on the outer side of the stator base, and the inner side wall of the first annular structure and the protective cover are jointly arranged to form a stator mounting groove. A plurality of first mating protrusions are formed at one end of the rotor sleeve away from the rotor turntable, and the plurality of first mating protrusions are arranged at radial intervals along the rotor sleeve, and first mating grooves are formed between adjacent first mating protrusions. A plurality of second mating protrusions are arranged at one end of the protective cover close to the rotor sleeve, and the plurality of second mating protrusions are arranged at radial intervals along the protective cover, and second mating grooves are formed between adjacent second mating protrusions, wherein the plurality of first mating protrusions are staggered with the plurality of second mating protrusions, the plurality of first mating protrusions are correspondingly mated with the plurality of second mating grooves, and the plurality of second mating protrusions are correspondingly mated with the plurality of first mating grooves, so that a labyrinth sealing structure is formed between the protective cover and the rotor sleeve.

[0015] Furthermore, a second step surface is formed on one end of the protective cover close to the rotor sleeve, the supporting portion cooperates with the second step surface, and a plastic sleeve is arranged between the supporting portion and the second step surface.

[0016] Furthermore, an interference fit is adopted between the plastic sleeve and the protective cover, and a clearance fit is adopted between the plastic sleeve and the rotor sleeve.

[0017] Furthermore, the stator assembly includes a stator core and a stator winding, wherein the stator winding is wound on the stator core, wherein a part of the stator winding is connected through a bus to form a set of three-phase motor control circuits, and another part of the stator winding is connected through a bus to form another set of three-phase motor control circuits, and the two three-phase motor control circuits work relatively independently.

[0018] Furthermore, two drive control units are arranged in the controller assembly, and the two drive control units are respectively connected to the two three-phase motor control circuits, and the two drive control units work relatively independently.

[0019] Furthermore, the two drive control units are integrated on the same circuit board, and the two drive control units are arranged symmetrically about a geometric center line of the circuit board.

[0020] Furthermore, two cooling zones are arranged in the controller flow channel structure, and the two cooling zones are respectively arranged corresponding to the two drive control units, wherein the water inlet hole of the controller flow channel structure is arranged between the two cooling zones, so that the coolant entering the controller flow channel structure is divided into two liquid flow paths and enters the two cooling zones respectively.

[0021] Furthermore, the two cooling zones are symmetrically arranged about a geometric center line of the controller flow channel structure, and the water inlet hole is located on the geometric center line of the controller flow channel structure.

[0022] Furthermore, the controller flow channel structure has a water outlet hole, and a guide member is provided at the water outlet hole of the controller flow channel structure, and the guide member is used to guide the two liquid branches after passing through the two cooling zones into the water outlet hole.

[0023] Furthermore, the cooling assembly also includes a water pump, the water pump is connected to the controller flow channel structure, and the internal flow channel of the heat exchanger is connected to the water pump.

[0024] According to another aspect of the present invention, an aircraft is provided. The aircraft has an electric drive system, and the electric drive system is the above-mentioned electric drive system.

[0025] By applying the technical solution of the present invention, a controller flow channel structure is provided in the controller housing, and the controller flow channel structure is connected to the motor flow channel structure, so that the cooling assembly can perform cooling operations on at least one of the motor assembly and the controller assembly, thereby realizing the integrated setting of controller cooling and motor cooling. On the one hand, the cooling structure of the electric drive system is simplified, the integration of the electric drive system is improved, and the power density of the electric drive system is improved. On the other hand, the cooling efficiency of the electric drive system is also improved. The technical solution of the present application effectively solves the problem of low heat dissipation efficiency of the electric drive system in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 A schematic structural diagram of an embodiment of an electric drive system according to the present invention is shown;

[0028] Figure 2 A front view of an embodiment of a motor assembly according to the present invention with a protective cover removed is shown;

[0029] Figure 3 Shows Figure 2 Schematic cross-sectional view of section AA;

[0030] Figure 4 Shows Figure 3 Schematic diagram of the cross-section of the middle BB section;

[0031] Figure 5 A cross-sectional schematic diagram of an embodiment of a motor assembly according to the present invention without installing a stator assembly and a rotor assembly is shown;

[0032] Figure 6 A schematic structural diagram of a first embodiment of a stator base according to the present invention is shown;

[0033] Figure 7 A schematic structural diagram of an embodiment of a stator assembly according to the present invention is shown;

[0034] Figure 8 A schematic structural diagram of an embodiment of a rotating shaft according to the present invention is shown;

[0035] Fig. 9 A cross-sectional schematic diagram of a first embodiment of a controller assembly according to the present invention is shown;

[0036] Fig.10 A schematic structural diagram of a second embodiment of a controller assembly according to the present invention is shown;

[0037] Fig.11 A schematic structural diagram of a third embodiment of a controller assembly according to the present invention is shown;

[0038] Fig.12 A schematic structural diagram of a second embodiment of a stator base according to the present invention is shown;

[0039] Fig.13 A schematic structural diagram of an embodiment of a controller flow channel structure according to the present invention is shown.

[0040] The above drawings include the following reference numerals:

[0041] 1. Motor assembly; 11. Stator base; 111. Motor flow channel structure; 112. Stator mounting slot; 12. Rotor assembly; 121. Rotating shaft; 13. Stator assembly; 131. Stator winding; 14. Water channel sealing plate;

[0042] 2. Controller assembly; 21. Controller flow channel structure; 211. Cooling zone; 212. Water inlet hole; 213. Water outlet hole; 214. Flow guide; 22. Drive control unit;

[0043] 3. Cooling assembly; 31. Heat exchanger; 32. Water pump;

[0044] 4. Rotor turntable;

[0045] 5. rotor sleeve; 51. supporting portion; 52. first step surface; 53. second step surface;

[0046] 8. Labyrinth sealing structure;

[0047] 9. Protective cover;

[0048] 10. Plastic bushing;

[0049] 100, W-phase first winding; 101, V-phase first winding; 102, U-phase first winding; 103, W-phase second winding; 104, V-phase second winding; 105, U-phase second winding. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0054] An outer rotor motor is a special type of motor with the rotor located outside the motor and the stator located in the center. Compared with traditional inner rotor motors, outer rotor motors have unique structural and performance characteristics and are suitable for specific application scenarios.

[0055] The rotor of an outrunner motor rotates around the stator, which is the opposite of the layout of a conventional motor. Because the rotor is located on the outside, outrunner motors generally have a higher torque density, providing more torque in a compact size. The design of outrunner motors helps achieve high power density, which means providing more power output in a smaller volume.

[0056] External rotor motors generally have lower noise levels because the unbalanced mass of the rotor is located further away from the center of rotation.

[0057] Due to the lower mechanical loss, the outer rotor motor can achieve higher operating efficiency.

[0058] The compact design of external rotor motors makes them suitable for applications where space is restricted.

[0059] External rotor motors can be installed in a variety of ways, such as direct drive or through transmission devices such as couplings and gears.

[0060] Because the outer surface of the rotor is away from the center of rotation, external rotor motors are suitable for applications that operate at high speeds.

[0061] Since the outer rotor motor has the above advantages, its application fields are increasing. However, the cooling structure of the outer rotor motor in the prior art is complex, and can only cool the motor, and the cooling efficiency is low.

[0062] Combination Figures 1 to 13 As shown, according to a specific embodiment of the present application, an electric drive system is provided, including: a motor assembly 1, a controller assembly 2, and a cooling assembly 3. The motor assembly 1 includes a stator base 11, on which a rotor assembly 12 and a stator assembly 13 are mounted, the rotor assembly 12 includes a rotating shaft 121, the stator assembly 13 is located on the outside of the rotating shaft 121, and a motor flow channel structure 111 is provided on the stator base 11, and the motor flow channel structure 111 is provided between the rotating shaft 121 and the stator assembly 13; the controller assembly 2 is located at the bottom of the motor assembly 1, the controller assembly 2 is connected to the motor assembly 1, the controller assembly 2 includes a controller housing, a controller flow channel structure 21 is provided in the controller housing, and the controller flow channel structure 21 is communicated with the motor flow channel structure 111; the cooling assembly 3 is connected to the controller assembly 2, the cooling assembly 3 includes a heat exchanger 31, and the internal flow channel of the heat exchanger 31 is communicated with the controller flow channel structure 21, wherein the cooling assembly 3 is used to perform cooling operations on at least one of the motor assembly 1 and the controller assembly 2.

[0063] By applying the technical solution of the present application, a controller flow channel structure 21 is provided in the controller housing, and the controller flow channel structure 21 is connected to the motor flow channel structure 111, so that the cooling assembly 3 can perform cooling operations on at least one of the motor assembly 1 and the controller assembly 2, thereby realizing the integrated setting of controller cooling and motor cooling. On the one hand, the cooling structure of the electric drive system is simplified, the integration of the electric drive system is improved, and the power density of the electric drive system is improved. On the other hand, the cooling efficiency of the electric drive system is also improved. The technical solution of the present application effectively solves the problem of low heat dissipation efficiency of the electric drive system in the prior art.

[0064] Combination Figure 4 , Figure 5 and Fig.12As shown, further, a first annular structure and a second annular structure are provided on the stator base 11, the first annular structure forms a stator mounting groove 112 for mounting the stator assembly 13, along the radial direction of the stator base 11, the stator mounting groove 112 is located on the outside of the rotating shaft 121, the second annular structure is located on the inside of the first annular structure, and the interior of the second annular structure forms a motor flow channel structure 111.

[0065] In the technical solution of the above embodiment, starting from the structure of the outer rotor motor, the inner space of the stator base 11 is fully utilized to achieve water cooling of the stator assembly 13 in the first annular structure.

[0066] Optionally, the first annular structure can be any form of structure, such as a groove with an opening on the top, or a structure with openings on the top and sides. The first annular structure can independently install the stator assembly 13, or the first annular structure can cooperate with other structures to install the stator assembly 13 together.

[0067] Combination Figure 6 As shown, the second annular structure is an annular groove with an opening on one side, and the annular groove has an opening on the side facing away from the controller assembly 2. The motor assembly 1 also includes a water channel sealing plate 14, which is located at the top of the annular groove. The water channel sealing plate 14 is connected to the stator base 11, and the water channel sealing plate 14 is used to seal the opening so that a motor flow channel structure 111 is formed between the side wall of the annular groove and the water channel sealing plate 14.

[0068] In the technical solution of the above embodiment, the water channel sealing plate 14 is used to seal the opening of the annular groove to prevent coolant leakage and improve the sealing and reliability of the system. Since the middle of the stator base 11 needs to be installed with a rotating shaft, the second annular structure is designed as an annular groove, so that the motor flow channel structure 111 can be basically flush with the rotating shaft installation structure, making full use of the structural characteristics of the stator base.

[0069] Optionally, the water channel sealing plate 14 and the stator base 11 are integrally formed.

[0070] Furthermore, the first annular structure and the second annular structure share a side wall.

[0071] In the technical solution of the above embodiment, the shared side wall can improve the cooling efficiency of the coolant passing through the motor flow channel structure 111 in the second annular structure, while reducing the occupied space of the cooling system and improving the power density of the electric drive system.

[0072] Optionally, the center of the stator base body is provided with front and rear bearing seats to fix the front and rear bearings respectively. The stator base body is hollowed out internally, and one end is welded with a water channel sealing plate to form a U-shaped motor water channel inside.

[0073] Combination Fig.13As shown, a control circuit board is disposed in the controller assembly 2, and a controller flow channel structure 21 is located at the bottom of the control circuit board. The controller flow channel structure 21 is a cavity flow channel disposed in the controller housing.

[0074] In the technical solution of the above embodiment, the heat generating components of the control circuit board can be effectively cooled by the controller flow channel structure 21 .

[0075] Combination Fig.13 As shown, projected along the thickness direction of the controller assembly 2, the controller flow channel structure 21 is polygonal, the controller assembly 2 is circular, and each vertex of the polygon is connected to the circle.

[0076] In the technical solution of the above embodiment, by setting the relative relationship between the controller flow channel structure 21 and the controller assembly 2, the controller flow channel structure 21 can have a larger cooling area.

[0077] Furthermore, the cooling assembly 3 is arranged at the bottom of the controller assembly 2, and the central axis of the motor assembly 1, the central axis of the controller assembly 2 and the geometric center line of the cooling assembly 3 are arranged to coincide with each other.

[0078] The above configuration scheme can improve the integration of the electric drive system, facilitate assembly, and make the motor operation process more stable.

[0079] Combination Figure 4 and Figure 5 As shown, the motor assembly 1 also includes a rotor disc 4 and a rotor sleeve 5. The rotor disc 4 is connected to the rotating shaft 121. The rotor disc 4 is located on the top of the stator base 11. The rotor disc 4 is connected to the stator base 11. The rotor sleeve 5 is arranged between the rotor disc 4 and the stator base 11. The rotor sleeve 5 has a supporting portion 51 for supporting at least one of the magnetic steel and the rotor core.

[0080] By supporting the magnetic steel by the rotor sleeve 5, the magnetic steel can be prevented from directly contacting the rotor turntable, reducing possible wear and direct thermal effects of the magnetic steel. The supporting portion 51 is used to support the rotor core. This design can provide additional support and reduce deformation of the rotor assembly. The supporting portion 51 is used to support the magnetic steel to ensure that the magnetic steel is in the correct position to achieve accurate magnetic field distribution. The cooperation between the rotor turntable 4 and the rotor sleeve can ensure the stability of the rotor assembly during operation.

[0081] Combination Figure 4 and Figure 5 As shown, one end of the rotor sleeve 5 close to the rotor disk 4 abuts against the rotor disk 4 via a first step surface 52 .

[0082] In the technical solution of the above embodiment, the first step surface 52 facilitates the positioning and assembly between the rotor sleeve 5 and the rotor turntable 4, while avoiding axial runout or radial movement between the two.

[0083] Furthermore, a plurality of first mating protrusions are formed at one end of the rotor sleeve 5 away from the rotor turntable 4, and the plurality of first mating protrusions are arranged at radial intervals along the rotor sleeve 5, and first mating grooves are formed between adjacent first mating protrusions. A plurality of second mating protrusions are arranged at one end of the stator base 11 close to the rotor sleeve 5, and the plurality of second mating protrusions are arranged at radial intervals along the stator base 11, and second mating grooves are formed between adjacent second mating protrusions, wherein the plurality of first mating protrusions and the plurality of second mating protrusions are staggered, the plurality of first mating protrusions correspond to the plurality of second mating grooves, and the plurality of second mating protrusions correspond to the plurality of first mating grooves, so that a labyrinth sealing structure 8 is formed between the rotor sleeve 5 and the stator base 11.

[0084] In the technical solution of the above embodiment, the sealing performance between the rotor sleeve 5 and the stator base 11 can be significantly improved by the labyrinth seal structure 8, and the stator assembly can be well protected. At this time, the first annular structure on the stator base 11 is a groove, and a plurality of second matching protrusions are arranged on the side wall of the groove at one end facing the rotor sleeve 5.

[0085] Combination Figure 5 As shown, the motor assembly 1 includes a protective cover 9, which is located on the outside of the stator base 11, and the inner side wall of the first annular structure and the protective cover 9 are jointly arranged to form a stator mounting groove 112. A plurality of first mating protrusions are formed at one end of the rotor sleeve 5 away from the rotor turntable 4, and the plurality of first mating protrusions are arranged at radial intervals along the rotor sleeve 5, and first mating grooves are formed between adjacent first mating protrusions. A plurality of second mating protrusions are arranged at one end of the protective cover 9 close to the rotor sleeve 5, and the plurality of second mating protrusions are arranged at radial intervals along the protective cover 9, and second mating grooves are formed between adjacent second mating protrusions, wherein the plurality of first mating protrusions are staggered with the plurality of second mating protrusions, the plurality of first mating protrusions are correspondingly matched with the plurality of second mating grooves, and the plurality of second mating protrusions are correspondingly matched with the plurality of first mating grooves, so that a labyrinth sealing structure 8 is formed between the protective cover 9 and the rotor sleeve 5.

[0086] In the technical solution of the above embodiment, the labyrinth seal structure 8 can significantly improve the sealing performance between the rotor sleeve 5 and the protective cover 9, and can well protect the stator assembly. At this time, the inner side wall of the first annular structure and the protective cover 9 are jointly formed to form the stator installation groove 112.

[0087] Through the sealing design of the outer rotor in the above embodiment, the stator assembly is dustproof and waterproof, thereby improving the service life of the motor.

[0088] Combination Figure 5 As shown, a second step surface 53 is formed at one end of the protective cover 9 close to the rotor sleeve 5 , the supporting portion 51 cooperates with the second step surface 53 , and a plastic sleeve 10 is arranged between the supporting portion 51 and the second step surface 53 .

[0089] In the technical solution of the above embodiment, the working stability of the rotor assembly is improved and the assembly difficulty of the stator assembly is simplified by the cooperation between the second step surface 53 and the second step surface 53.

[0090] Optionally, the magnetic steel sleeve assembly includes a rotor sleeve, a rotor core, a rotor turntable and magnetic steel.

[0091] Optionally, in order to ensure the reliability of the bearing torque, on the basis of the interference fit between the rotor core and the rotor sleeve, 8 keys are evenly distributed on the outer circumference of the rotor core to cooperate with the rotor sleeve for connection.

[0092] Optionally, high-strength epoxy glue is used to adhere the magnetic steel to the inner wall of the rotor core.

[0093] In order to prevent the axial movement of the magnet and the rotor core, a stop boss (also known as the supporting portion 51) is provided at the bottom of the rotor sleeve to support the rotor core and the magnet. The rotor turntable is connected and fixed to the rotor sleeve by 16 radially evenly distributed screws, and the rotor core and the magnet are pressed by the bottom of the rotor turntable.

[0094] Furthermore, an interference fit is adopted between the plastic sleeve 10 and the protective cover 9 , and a clearance fit is adopted between the plastic sleeve 10 and the rotor sleeve 5 .

[0095] Furthermore, the plastic sleeve is made of polytetrafluoroethylene, which has a small friction coefficient and improves sealing performance.

[0096] Furthermore, the stator assembly 13 includes a stator core and a stator winding 131, wherein the stator winding 131 is wound on the stator core, wherein a portion of the stator winding 131 is connected through a bus to form a set of three-phase motor control circuits, and another portion of the stator winding 131 is connected through a bus to form another set of three-phase motor control circuits, and the two three-phase motor control circuits operate relatively independently.

[0097] In the technical solution of the above embodiment, the controller has a dual-stator control function, and two independent drive control units are included in one controller. The motor windings are divided into two groups, each group is connected to form a set of three-phase U\V\W windings, and the controller includes two independent drive control units to control the two sets of three-phase windings respectively, and a redundant design is performed, that is, when one set has a problem, the other set can work normally, thereby improving safety and reliability.

[0098] Specifically, Figure 7, a W-phase first winding 100 , a V-phase first winding 101 , a U-phase first winding 102 , a W-phase second winding 103 , a V-phase second winding 104 , and a U-phase second winding 105 are shown.

[0099] Combination Fig. 9 As shown, two drive control units 22 are arranged in the controller assembly 2. The two drive control units 22 are respectively connected to two three-phase motor control circuits, and the two drive control units 22 work relatively independently.

[0100] Furthermore, the two driving control units 22 are integrated on the same circuit board, and the two driving control units 22 are arranged symmetrically about the geometric center line of the circuit board.

[0101] Combination Fig.13 As shown, two cooling zones 211 are arranged in the controller flow channel structure 21, and the two cooling zones 211 are respectively arranged corresponding to the two drive control units 22, wherein the water inlet hole 212 of the controller flow channel structure 21 is arranged between the two cooling zones 211, so that the coolant entering the controller flow channel structure 21 is divided into two liquid flow paths and enters the two cooling zones 211 respectively.

[0102] In the technical solution of the above embodiment, the two drive control units 22 share a controller housing. After the cooling water enters the controller housing, it is divided into two paths to cool the two drive control units 22 respectively, and then merges into one path to enter the motor flow channel structure 111 of the motor, and finally flows out into the cooling system for cooling and then re-enters the controller flow channel structure to form a cycle.

[0103] Furthermore, the two cooling zones 211 are symmetrically arranged about the geometric center line of the controller flow channel structure 21 , and the water inlet 212 is located on the geometric center line of the controller flow channel structure 21 .

[0104] In the technical solution of the above embodiment, uniform heat dissipation of each component in the controller assembly can be achieved through symmetrical arrangement.

[0105] Combination Fig.13 As shown, the controller flow channel structure 21 has a water outlet 213 , and a guide member 214 is provided at the water outlet 213 . The guide member 214 is used to guide the two liquid branches after passing through the two cooling zones 211 into the water outlet 213 .

[0106] In the technical solution of the above embodiment, the guide 214 ensures that the coolant flows along a predetermined path to avoid liquid backflow or turbulence. By properly guiding the coolant, the guide can improve the cooling efficiency of the cooling zone and ensure that the heat is effectively removed. The guide can reduce the pressure loss when the coolant flows and improve the energy efficiency of the cooling system.

[0107] Specifically, the flow path of the coolant is: water inlet hole of the controller housing - divided into two paths and merging into the water outlet hole 213 of the controller housing (preferably two paths) - water inlet hole of the motor flow channel structure 111 - water outlet hole of the motor flow channel structure 111 - water inlet hole of the water pump - water outlet hole of the water pump - water inlet hole of the heat exchanger - water outlet hole of the heat exchanger - and then back to the water inlet hole 212 of the controller housing.

[0108] Combination Figure 1 As shown, the cooling assembly further includes a water pump 32 , which is in communication with the controller flow channel structure 21 , and the internal flow channel of the heat exchanger 31 is in communication with the water pump 32 .

[0109] like Figure 7 The stator assembly 13 is shown, and the stator assembly includes a stator core, slot insulation, flat wire winding, slot wedges and busbars. The flat wire winding is connected to the stator core by down-line and fixed by slot wedges. The three-phase busbar and the star point busbar are welded and connected according to the wiring diagram. The windings are divided into two groups, and each group is connected to form a set of three-phase U\V\W windings. After completion, the whole is potted with potting glue to improve the heat dissipation effect and prevent dust and water. The stator assembly after potting is assembled on the stator base by interference fit.

[0110] like Figure 8 The rotor assembly 12 is shown, and the rotor assembly includes a rotating shaft and front and rear bearings. The rotating shaft and the inner rings of the front and rear bearings are interference fit, the inner ring of the front bearing is limited by the rotating shaft shoulder and the retaining ring, the outer ring of the front bearing is transitionally fitted with the front bearing seat of the stator base and is pressed and fixed with a bearing pressure plate, the inner ring of the rear bearing is limited by the rotating shaft shoulder, the outer ring of the rear bearing is transitionally fitted with the rear bearing seat of the stator base and is pre-tightened with a wave washer. In order to reduce weight, the rotating shaft adopts a hollow shaft design, and the top of the rotating shaft is connected to the magnetic steel sleeve assembly by 8 screws. In order to further improve the load-bearing torque reliability, 8 rectangular keys are added to the top of the rotating shaft for connection.

[0111] According to another aspect of the present invention, an aircraft is provided. The aircraft has an electric drive system, and the electric drive system is the above-mentioned electric drive system.

[0112] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0113] Provide a high-performance aviation electric drive system that highly integrates the motor, controller and cooling system, has a small size and light weight, optimizes the installation space and connection wiring, and achieves high power density.

[0114] Both the motor and the controller are cooled by liquid cooling, and the controller cooling channel is integrated with the motor cooling channel to achieve a highly integrated design, simplify the cooling system design, and achieve high power density with a small size and light weight.

[0115] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0116] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0117] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric drive system, characterized in that: include: A motor assembly (1), the motor assembly (1) comprising a stator base (11), a rotor assembly (12) and a stator assembly (13) being mounted on the stator base (11), the rotor assembly (12) comprising a rotating shaft (121), the stator assembly (13) being located outside the rotating shaft (121), a motor flow channel structure (111) being arranged on the stator base (11), and the motor flow channel structure (111) being arranged between the rotating shaft (121) and the stator assembly (13); A controller assembly (2), the controller assembly (2) being located at the bottom of the motor assembly (1), the controller assembly (2) being connected to the motor assembly (1), the controller assembly (2) comprising a controller housing, a controller flow channel structure (21) being arranged in the controller housing, the controller flow channel structure (21) being in communication with the motor flow channel structure (111); A cooling assembly (3), wherein the cooling assembly (3) is connected to the controller assembly (2), and the cooling assembly (3) includes a heat exchanger (31), wherein an internal flow channel of the heat exchanger (31) is connected to the controller flow channel structure (21), wherein the cooling assembly (3) is used to perform a cooling operation on at least one of the motor assembly (1) and the controller assembly (2).

2. The electric drive system according to claim 1, characterized in that: A first annular structure and a second annular structure are provided on the stator base (11); the first annular structure forms a stator mounting groove (112) for mounting the stator assembly (13); along the radial direction of the stator base (11), the stator mounting groove (112) is located on the outside of the rotating shaft (121); the second annular structure is located on the inside of the first annular structure; and the motor flow channel structure (111) is formed inside the second annular structure.

3. The electric drive system according to claim 2, characterized in that: The second annular structure is an annular groove having an opening on one side, the annular groove having the opening on a side facing away from the controller assembly (2), the motor assembly (1) further comprising a water channel sealing plate (14), the water channel sealing plate (14) being located at the top of the annular groove, the water channel sealing plate (14) being connected to the stator base (11), the water channel sealing plate (14) being used to seal the opening, so that the motor flow channel structure (111) is formed between the side wall of the annular groove and the water channel sealing plate (14).

4. The electric drive system according to claim 2 or 3, characterized in that: The first annular structure and the second annular structure share a side wall.

5. The electric drive system according to claim 1, characterized in that: A control circuit board is arranged in the controller assembly (2), and the controller flow channel structure (21) is located at the bottom of the control circuit board. The controller flow channel structure (21) is a cavity flow channel arranged in the controller housing.

6. The electric drive system according to claim 1 or 5, characterized in that: Projected along the thickness direction of the controller assembly (2), the controller flow channel structure (21) is polygonal, the controller assembly (2) is circular, and each vertex of the polygon is connected to the circle.

7. The electric drive system according to claim 1, characterized in that: The cooling assembly (3) is arranged at the bottom of the controller assembly (2), and the central axis of the motor assembly (1), the central axis of the controller assembly (2) and the geometric center line of the cooling assembly (3) are arranged to coincide with each other.

8. The electric drive system according to claim 2, characterized in that: The motor assembly (1) further comprises a rotor disc (4) and a rotor sleeve (5), wherein the rotor disc (4) is connected to the rotating shaft (121), the rotor disc (4) is located on the top of the stator base (11), the rotor disc (4) is connected to the stator base (11), the rotor sleeve (5) is arranged between the rotor disc (4) and the stator base (11), and the rotor sleeve (5) has a supporting portion (51) for supporting at least one of a magnetic steel and a rotor core.

9. The electric drive system according to claim 8, characterized in that: One end of the rotor sleeve (5) close to the rotor turntable (4) abuts against the rotor turntable (4) via a first step surface (52).

10. The electric drive system according to claim 8 or 9, characterized in that: A plurality of first mating protrusions are formed at one end of the rotor sleeve (5) away from the rotor turntable (4), the plurality of first mating protrusions are arranged at intervals along the radial direction of the rotor sleeve (5), and first mating grooves are formed between adjacent first mating protrusions. A plurality of second mating protrusions are arranged at one end of the stator base (11) close to the rotor sleeve (5), the plurality of second mating protrusions are arranged at intervals along the radial direction of the stator base (11), and second mating grooves are formed between adjacent second mating protrusions, wherein the plurality of first mating protrusions and the plurality of second mating protrusions are arranged in a staggered manner, the plurality of first mating protrusions are mated with the plurality of second mating grooves correspondingly, and the plurality of second mating protrusions are mated with the plurality of first mating grooves correspondingly, so that a labyrinth sealing structure (8) is formed between the rotor sleeve (5) and the stator base (11).

11. The electric drive system according to claim 8 or 9, characterized in that: The motor assembly (1) comprises a protective cover (9), wherein the protective cover (9) is located on the outer side of the stator base (11), and the inner side wall of the first annular structure and the protective cover (9) are jointly arranged to form the stator mounting groove (112); a plurality of first matching protrusions are formed at one end of the rotor sleeve (5) away from the rotor turntable (4); the plurality of first matching protrusions are arranged at intervals along the radial direction of the rotor sleeve (5), and first matching grooves are formed between adjacent first matching protrusions; a plurality of second matching protrusions are arranged at one end of the protective cover (9) close to the rotor sleeve (5), and the plurality of second matching protrusions are arranged at intervals along the radial direction of the protective cover (9), and second matching grooves are formed between adjacent second matching protrusions, wherein the plurality of first matching protrusions and the plurality of second matching protrusions are staggered, the plurality of first matching protrusions are matched with the plurality of second matching grooves correspondingly, and the plurality of second matching protrusions are matched with the plurality of first matching grooves correspondingly, so that a labyrinth seal structure (8) is formed between the protective cover (9) and the rotor sleeve (5).

12. The electric drive system according to claim 11, characterized in that: A second step surface (53) is also formed at one end of the protective cover (9) close to the rotor sleeve (5), the supporting portion (51) cooperates with the second step surface (53), and a plastic sleeve (10) is provided between the supporting portion (51) and the second step surface (53).

13. The electric drive system according to claim 12, characterized in that: An interference fit is adopted between the plastic shaft sleeve (10) and the protective cover (9), and a clearance fit is adopted between the plastic shaft sleeve (10) and the rotor sleeve (5).

14. The electric drive system according to claim 1, characterized in that: The stator assembly (13) comprises a stator core and a stator winding (131), wherein the stator winding (131) is wound on the stator core, wherein a portion of the stator winding (131) is connected via a bus to form a set of three-phase motor control circuits, and another portion of the stator winding (131) is connected via a bus to form another set of three-phase motor control circuits, and the two three-phase motor control circuits operate relatively independently.

15. The electric drive system according to claim 14, characterized in that: Two drive control units (22) are arranged in the controller assembly (2), and the two drive control units (22) are respectively connected to the two three-phase motor control circuits, and the two drive control units (22) work relatively independently.

16. The electric drive system according to claim 15, characterized in that: The two drive control units (22) are integrated on the same circuit board, and the two drive control units (22) are arranged symmetrically about the geometric center line of the circuit board.

17. The electric drive system according to claim 15 or 16, characterized in that: Two cooling zones (211) are arranged in the controller flow channel structure (21), and the two cooling zones (211) are respectively arranged corresponding to the two drive control units (22), wherein the water inlet hole (212) of the controller flow channel structure (21) is arranged between the two cooling zones (211), so that the cooling liquid entering the controller flow channel structure (21) is divided into two liquid flow paths and enters the two cooling zones (211) respectively.

18. The electric drive system according to claim 17, characterized in that: The two cooling zones (211) are symmetrically arranged about the geometric center line of the controller flow channel structure (21), and the water inlet hole (212) is located on the geometric center line of the controller flow channel structure (21).

19. The electric drive system according to claim 17, characterized in that: The controller flow channel structure (21) has a water outlet hole (213), and the controller flow channel structure (21) is provided with a flow guide (214) at the water outlet hole (213), and the flow guide (214) is used to guide two liquid branches after passing through the two cooling zones (211) into the water outlet hole (213).

20. The electric drive system according to claim 1, characterized in that: The cooling assembly (3) further comprises a water pump (32), wherein the water pump (32) is in communication with the controller flow channel structure (21), and the internal flow channel of the heat exchanger (31) is in communication with the water pump (32).

21. An aircraft having an electric drive system, characterized in that: The electric drive system is the electric drive system according to any one of claims 1 to 20.

Images