EVTOL aircraft and yoke-free motor thereof

Abstract

The utility model discloses an eVTOL aircraft and a yoke-free motor thereof.The yoke-free motor comprises a stator support and a shell rotationally arranged on the stator support in a sleeving mode, a plurality of installation grooves are evenly formed in the circumferential edge of the stator support, iron cores are arranged in the installation grooves respectively, the iron cores are provided with windings, and the windings are wound around the stator support. And a permanent magnet corresponding to the iron core is arranged on the inner wall of the shell. The yoke-free motor is compact in structure, the iron core is inserted into the mounting groove of the stator support, a yoke part of an iron core of a traditional motor is omitted, namely, a magnetic flux path of the yoke part is omitted, so that a magnetic flux line is shortened, the saturation degree of the tooth part of the iron core can be increased by increasing the number of turns of the winding, and the magnetic flux intensity of the tooth part of the iron core is further enhanced.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and in particular to an eVTOL aircraft and its yokeless motor. Background Technology

[0002] eVTOL (electric vertical take-off and landing) aircraft use motors to drive the rotation of their wings, providing power to the aircraft. Flux motors, a commonly used type of aircraft motor, can be classified into radial flux motors and axial flux motors based on the direction of their magnetic field. For motors of the same diameter, axial flux motors have a higher power density than radial flux motors because their effective flux area is larger. However, both axial and radial flux motors are unidirectional, resulting in inefficient use of internal space. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide an eVTOL aircraft and its yokeless motor to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This application discloses a yokeless motor, including a stator support and a housing rotatably sleeved on the stator support. The stator support has a plurality of mounting slots evenly arranged along its circumferential edge. Iron cores are respectively arranged in the mounting slots. The iron cores are provided with windings. The inner wall of the housing is provided with permanent magnets corresponding to the iron cores.

[0006] Furthermore, in the aforementioned yokeless motor, the iron core includes a set of radial teeth and two sets of axial teeth, and the winding is disposed on the radial teeth.

[0007] Furthermore, in the aforementioned yokeless motor, the ends of the radial teeth and axial teeth are respectively provided with pole shoes.

[0008] Furthermore, in the aforementioned yokeless motor, the permanent magnet includes a set of radial permanent magnets and two sets of axial permanent magnets, each corresponding to a pole shoe.

[0009] Furthermore, in the aforementioned yokeless motor, the housing includes a cylindrical rotor housing with openings at both ends, and a front cover and a rear cover respectively disposed at both ends of the rotor housing. The radial permanent magnet is disposed on the rotor housing, and two sets of axial permanent magnets are respectively disposed on the inner surfaces of the front cover and the rear cover.

[0010] Furthermore, in the aforementioned yokeless motor, the iron core includes two sets of silicon steel sheet groups arranged back to back, each set of silicon steel sheet groups including several stacked L-shaped silicon steel sheets, and pole shoe plates forming pole shoes are respectively provided at both ends of the L-shaped silicon steel sheets.

[0011] Furthermore, in the aforementioned yokeless motor, the L-shaped silicon steel sheet is made of non-oriented silicon steel sheet or oriented silicon steel sheet.

[0012] Furthermore, in the aforementioned yokeless motor, the inner ring of the stator bracket is fixedly connected to a main shaft, and one end of the main shaft is rotatably connected to a mounting column.

[0013] Furthermore, in the aforementioned yokeless motor, the inner ring of the stator bracket is fixedly connected to a mounting column, and one end of the mounting column is rotatably connected to a main shaft.

[0014] This application also discloses an eVTOL aircraft, including the aforementioned yokeless motor.

[0015] Compared with the prior art, the advantages of this utility model are: the yokeless motor has a compact structure, the iron core is inserted into the mounting slot of the stator bracket, the yoke of the iron core of the traditional motor is eliminated, that is, the magnetic flux path of the yoke is eliminated, thereby shortening the magnetic flux line, and the saturation of the iron core teeth can be increased by increasing the number of winding turns, which further enhances the magnetic flux intensity of the iron core teeth. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The diagram shown is a schematic diagram of the structure of a yokeless motor in a specific embodiment of this utility model.

[0018] Figure 2 The figure shown is a three-dimensional schematic diagram of a yokeless motor in a specific embodiment of this utility model.

[0019] Figure 3 The figure shown is a cross-sectional schematic diagram of a yokeless motor in a specific embodiment of this utility model.

[0020] Figure 4 The diagram shown is an exploded view of a yokeless motor in a specific embodiment of this utility model.

[0021] Figure 5 The diagram shown is a schematic representation of the installation of the iron core and stator support in a specific embodiment of this utility model.

[0022] Figure 6 The following is a schematic structural view of the iron core in a specific embodiment of the present utility model.

[0023] Figure 7 The following is a schematic structural view of a yoke - free motor after omitting the iron core and winding in another specific embodiment of the present utility model. Detailed Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be described in detail with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] Refer Figures 1 to 7 As shown, a yoke - free motor includes a stator bracket 1 and a housing 2 rotatably sleeved on the stator bracket 1. A plurality of mounting grooves are uniformly arranged on the circumferential edge of the stator bracket 1. Iron cores 3 are respectively arranged in the mounting grooves. Windings 4 are arranged on the iron cores 3. Permanent magnets 5 corresponding to the iron cores 3 are arranged on the inner wall of the housing 2.

[0028] In this technical solution, the stator support includes an outer ring and an inner ring arranged coaxially, as well as connecting ribs connecting the outer ring and the inner ring support. The inner wall of the outer ring has several heat dissipation fins protruding from it, and the outer wall of the outer ring is provided with several mounting slots for installing the iron core. The iron core is inserted into the mounting slots of the stator support. The yoke of the iron core in the traditional motor is eliminated, that is, the magnetic flux path of the yoke is eliminated, thereby shortening the magnetic flux circuit. Furthermore, the saturation of the iron core teeth can be increased by increasing the number of winding turns, which further enhances the magnetic flux intensity of the iron core teeth.

[0029] For example, see Figures 3 to 7 As shown, the iron core 3 includes a set of radial teeth and two sets of axial teeth, and the winding 4 is disposed on the radial teeth.

[0030] In this technical solution, after the coil winding is energized, the iron core forms three magnetic field surfaces, namely one radial magnetic field surface and two axial magnetic field surfaces, which increases the effective area of ​​magnetic flux.

[0031] For example, see Figures 3 to 7 As shown, the ends of the radial teeth and axial teeth are respectively provided with pole shoes.

[0032] In this technical solution, the pole shoe can prevent the coil winding from collapsing, while reducing the air gap magnetic resistance and improving the magnetic field distribution. The outer end face of the pole shoe at the radial tooth end is an arc surface structure, and the iron core is set behind the stator support. The arc surface of the pole shoe is coaxial with the inner wall of the housing. During the relative rotation of the housing and the stator support, the distance between the pole shoe and the housing remains unchanged.

[0033] For example, see Figure 3 , Figure 4 and Figure 7 As shown, the permanent magnet 5 includes a set of radial permanent magnets 51 and two sets of axial permanent magnets 52, which are respectively corresponding to the pole shoes.

[0034] In this technical solution, three sets of permanent magnets increase the area of ​​the magnetic field, and by reducing the thickness of the permanent magnets, the air gap between the permanent magnets and the iron core is further shortened.

[0035] For example, see Figure 3 , Figure 4 and Figure 7 As shown, the housing 2 includes a cylindrical rotor housing 21 with openings at both ends, and a front cover 22 and a rear cover 23 respectively disposed at both ends of the rotor housing 21. Radial permanent magnets are disposed on the rotor housing 21, and two sets of axial permanent magnets are respectively disposed on the inner surfaces of the front cover 22 and the rear cover 23.

[0036] In this technical solution, the front cover and the rear cover are disassembled and assembled at both ends of the rotor housing opening by conventional bolts, etc. The radial permanent magnet is set on the inner wall of the rotor housing (the side wall near the iron core), and two sets of axial permanent magnets are respectively set on the inner surface of the front cover and the rear cover (the side end face near the iron core). The air gap between the permanent magnet and the iron core is uniform and the spacing is controllable.

[0037] For example, see Figures 3 to 7 As shown, the iron core 3 includes two sets of silicon steel sheets arranged back to back. Each set of silicon steel sheets includes several stacked L-shaped silicon steel sheets 31. The two ends of the L-shaped silicon steel sheets are respectively provided with pole shoes to form pole shoes.

[0038] In this technical solution, silicon steel sheets are cut into an "I"-shaped structure as needed, including connecting strips and first and second pole pieces at both ends of the connecting strips. In the same silicon steel sheet assembly, the shape and size of the first and second pole pieces of all silicon steel sheets are completely consistent. After being stacked, their outer contours are completely overlapped in the axial direction (rotor or stator axis). The connecting strips of adjacent silicon steel sheets have the same width and the length gradually increases from the inside to the outside, ensuring that after the connecting strips are bent and stacked, the outer contours of the first pole pieces are completely overlapped in the axial direction, and the outer end faces (end faces away from the axial teeth) of the second pole pieces are completely overlapped. The two parts of the bent connecting strips are stacked to form radial teeth and axial teeth respectively. The stacking is achieved through conventional riveting and other processes. Adjacent silicon steel sheets are tightly fitted together without gaps to form a silicon steel sheet assembly. Two silicon steel sheet assemblies are set back to back to form an iron core with one radial first pole piece and two axial second pole pieces. After the iron core is wound and energized, it can generate axial and radial magnetic fields simultaneously.

[0039] For example, see Figures 3 to 7 As shown, the L-shaped silicon steel sheet 31 is made of non-oriented silicon steel sheet or oriented silicon steel sheet.

[0040] In this technical solution, L-shaped silicon steel sheets can be made from conventional non-oriented silicon steel sheets or oriented silicon steel sheets. Compared with non-oriented silicon steel sheets, oriented silicon steel sheets can increase the magnetic flux density of the iron core and further improve the efficiency of the motor.

[0041] For example, see Figure 7 As shown, the inner ring of the stator bracket 1 is fixedly connected to the main shaft 6, and one end of the main shaft 6 is rotatably connected to the mounting column 7.

[0042] In this technical solution, the front cover and rear cover are respectively recessed with clearance holes corresponding to the mounting post and the main shaft. The main shaft is fixed to the inner wall of the inner ring of the stator bracket by means of interference fit, etc. One end of the mounting post is rotatably connected to the outer wall of the mounting post through a bearing, and is axially fixed to the main shaft by conventional locking blocks, etc. The locking blocks and the main shaft are fixed by threaded connection. The outer wall of the main shaft is rotatably connected to the inner wall of the clearance hole of the front cover through an auxiliary bearing. The yokeless motor can be cooled by conventional air cooling. If it is cooled by oil cooling, a skeleton sealing ring can be set on the outside of the auxiliary bearing to form a sealed space and fill it with cooling oil, etc., which also reduces the entry of dust and other particles into the interior of the yokeless motor. In use, the main shaft is fixed to the fuselage of the aircraft by bolts, etc., and the wings of the aircraft are installed on the end of the mounting post by bolts, etc.

[0043] For example, see Figure 3 As shown, the inner ring of the stator bracket 1 is fixedly connected to the mounting column 7, and one end of the mounting column 7 is rotatably connected to the main shaft 6.

[0044] In this technical solution, the front cover and rear cover are respectively recessed with clearance holes corresponding to the mounting post and the main shaft. The mounting post is fixed to the inner wall of the inner ring of the stator bracket by interference fit or other means. One end of the main shaft is rotatably connected to the inner wall of the mounting post through a bearing and is axially fixed to the mounting post by conventional locking blocks or other means. The locking blocks and the main shaft are fixed by threaded connection. The outer wall of the mounting post is rotatably connected to the inner wall of the clearance hole of the front cover through an auxiliary bearing. The yokeless motor can be cooled by conventional air cooling. If it is cooled by oil cooling, a skeleton sealing ring can be set on the outer side of the auxiliary bearing to form a sealed space and fill it with cooling oil, etc., which also reduces the entry of dust and other substances into the interior of the yokeless motor. In use, the mounting post is fixed to the fuselage of the aircraft by bolts or other means, and the wings of the aircraft are installed on the main shaft by threaded connection or other means.

[0045] For example, an eVTOL aircraft includes the aforementioned yokeless motor.

[0046] In this technical solution, the yokeless motor is mounted on the fuselage via a main shaft or mounting column. The main shaft and mounting column, which are axially fixed to each other, prevent the front and rear covers from deforming due to the pull force during takeoff.

[0047] In summary, this yokeless motor has a compact structure, with the iron core inserted into the mounting slot of the stator bracket. By eliminating the yoke of the iron core in traditional motors, the magnetic flux path of the yoke is eliminated, thereby shortening the magnetic flux circuit. Furthermore, the saturation of the iron core teeth can be increased by increasing the number of winding turns, further enhancing the magnetic flux intensity of the iron core teeth.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A yokeless electrical machine characterised in that, The application relates to a motor, which comprises a stator support, a housing arranged on the stator support, a plurality of installation grooves arranged on the circumferential edge of the stator support, an iron core arranged in each installation groove, a winding arranged on the iron core, and a permanent magnet arranged on the inner wall of the housing and corresponding to the iron core.

2. The yokeless machine of claim 1, wherein: The iron core comprises a group of radial teeth and two groups of axial teeth, and the winding is arranged on the radial teeth.

3. The yokeless machine of claim 2, wherein: The end of the radial teeth and the axial teeth is respectively provided with a pole shoe.

4. The yokeless machine of claim 3, wherein: The permanent magnet comprises a group of radial permanent magnets and two groups of axial permanent magnets corresponding to the pole shoes.

5. The yokeless machine of claim 4, wherein: The housing comprises a cylindrical rotor housing with two open ends, a front cover and a rear cover arranged at the two ends of the rotor housing respectively, the radial permanent magnets are arranged on the rotor housing, and the two groups of axial permanent magnets are arranged on the inner surfaces of the front cover and the rear cover respectively.

6. The yokeless machine of claim 3, wherein: The iron core comprises two groups of silicon steel sheet groups arranged back to back, each group of the silicon steel sheet groups comprises a plurality of stacked L-shaped silicon steel sheets, and the two ends of the L-shaped silicon steel sheets are respectively provided with pole shoe sheets forming pole shoes.

7. The yokeless machine of claim 6, wherein: The L-shaped silicon steel sheet is made of non-oriented silicon steel sheet or oriented silicon steel sheet.

8. The no yoke motor of claim 1, wherein: The inner ring of the stator support is fixedly connected with a main shaft, and one end of the main shaft is rotationally connected with an installation column.

9. The no yoke motor of claim 1, wherein: The inner ring of the stator support is fixedly connected with an installation column, and one end of the installation column is rotationally connected with a main shaft.

10. An eVTOL aircraft, characterized in that, The application further relates to a non-yoke motor comprising the motor.

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