Magnetic gear rotor support structure

Abstract

The application belongs to the technical field of aero-engine starters, and specifically discloses a magnetic gear rotor support structure, which comprises: a rotor comprising an output rotor and an input rotor which are arranged in a split mode in a casing and a guider assembly structure of a magnetic gear, and the output rotor is axially provided with a hollow portion for sleeving the input rotor; a first annular cavity is formed between the input rotor and the output rotor; a connecting portion is circumferentially arranged on one end of the output rotor which protrudes axially from the input rotor, and a output shaft coaxial with the input rotor is arranged through the connecting portion; a second annular cavity is formed between the output shaft and the input rotor, and a support mechanism is arranged axially in the second annular cavity between the casing and the guider assembly structure, and the support mechanism is connected with the input rotor and the output shaft respectively; and the magnetic gear rotor support structure has the following advantages: the input rotor and the output rotor can be independent of each other except for the coupling effect of the magnetic field, thereby reducing the complexity of the whole rotor structure; and the input rotor and the output rotor do not directly contact during the working process, and the vibration and noise are small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine starter, in particular to a magnetic gear rotor support structure. BACKGROUND

[0002] The traditional air turbine starter mainly adopts planetary gear reducer, which has the advantages of stable operation, reliability, high transmission accuracy, etc. There are few reports on air turbine starters based on magnetic gear reducers at home and abroad. However, the magnetic gear originated in 1913, and an American scholar proposed the concept of magnetic gear in an invention patent. In 1973, American scientist Filer. B proposed a motor-driven pump, whose magnetic coupling assembly can effectively prevent fluid interflow. Magnetic gear transmission is a kind of non-mechanical transmission mode, which can overcome some unavoidable problems such as friction loss, vibration and noise in mechanical gear transmission. According to the structure form and rotor support mode of the magnetic gear, it can be divided into two types of traditional and magnetic field modulation.

[0003] The common double-rotor support mode is mainly used in aero-engines. From the perspective of the number of support points, it is mainly divided into two support points, three support points and four support points.

[0004] The two support point rotor support scheme is mainly applied to rigid rotors with less wheel disc series, short rotor axial span and good rigidity. The basic feature is simple structure. The support point distribution is mainly divided into the following types: ① The support points are respectively distributed at the rear of the compressor and the front of the turbine, but this scheme requires a higher shaft rigidity, so the axial length should not be too long. However, for the magnetic field modulation type magnetic gear, the axial length is about 100mm, so this scheme will affect the meshing effect of the gear to some extent. ② The support points are respectively located at the front of the compressor and the front of the turbine. The disadvantage of this scheme is that it will cause the axial gap to change too much, and at the same time it will also make the lubrication system more complex, and one of the characteristics of the starter is small size and light weight, so it does not meet the design requirements. ③ The support points are respectively located at the front of the compressor and the rear of the turbine. The disadvantage of this scheme is that the overall force bearing frame is complex, which will also cause the problem of excessive weight.

[0005] The three support point support scheme mostly adopts the 1-1-1 distribution mode. This scheme will also cause the overall structure to be unable to reduce the weight due to too many support point bearings, which does not meet the design requirements of the starter. The four support point support scheme is generally divided into a support scheme with one thrust bearing and a support scheme with two thrust bearings, but both of these two support schemes have a large axial load, and the speed coupling of the inner and output rotor assemblies of the magnetic gear can reach about 5000r / s, so this scheme is also not suitable for the rotor support of the magnetic gear. SUMMARY

[0006] The present application aims to provide a magnetic gear rotor support structure to solve or improve the above technical problems, such as the excessive length and radial size of the rotor, which cannot meet the requirements of the lightweight starter, and the high complexity of the system as a whole.

[0007] In view of the above, the first aspect of the present application aims to provide a magnetic gear rotor support structure.

[0008] The first aspect of the present application provides a magnetic gear rotor support structure, wherein the rotor comprises an output rotor assembly structure and an input rotor assembly structure arranged separately in a housing and a guide assembly structure of the magnetic gear, the output rotor assembly structure is axially provided with a hollow portion for sleeving the input rotor assembly structure; a first annular cavity is formed between the input rotor assembly structure and the output rotor assembly structure, the radial width of the first annular cavity is equal along the circumference of the input rotor assembly structure; a connecting portion is arranged circumferentially on one end of the output rotor assembly structure protruding axially from the input rotor assembly structure, an output shaft coaxial with the input rotor assembly structure is arranged through the connecting portion; a second annular cavity is formed between the output shaft and the input rotor assembly structure, and a support mechanism is arranged axially in the second annular cavity between the housing and the guide assembly structure, the support mechanism is connected to the input rotor assembly structure and the output shaft respectively to support the output rotor assembly structure and the input rotor assembly structure.

[0009] The magnetic gear rotor support structure provided by the present application reduces the total length of the rotor and the radial size of the rotor to the maximum extent, reduces the total weight of the starter, and compared with the traditional planetary gear starter, the magnetic gear of the present application reduces the complex support structure and components, selects the coaxial nesting mode of the input and output rotor assembly structure as the support scheme, reduces the complexity of the whole system, the stator core assembly in the magnetic gear stator assembly is fixed by the stator support frame, the structure of the connecting bridge is cancelled, and the total weight of the starter is further reduced.

[0010] By forming the first annular cavity between the input rotor assembly structure and the output rotor assembly structure for placing the stator 22, on the one hand, the stator 22 can be spaced apart from the input rotor assembly structure and the output rotor assembly structure, and on the other hand, the output rotor assembly structure can be independent of each other except for the coupling effect of the magnetic field, thereby reducing the complexity of the whole rotor structure;

[0011] By forming the first annular cavity with a radial width equal along the circumference of the input rotor assembly structure 1, the input rotor assembly structure and the output rotor assembly structure do not directly contact each other, and the vibration and noise are small during high-speed rotation of the input rotor assembly structure and the output rotor assembly structure.

[0012] The magnetic gear has an overload protection function, that is, in an overload condition, the magnetic gear can protect the structure from physical damage by out-of-step operation, when the overload occurs, the resultant moment of the low-speed rotor suddenly increases, the rotation speed of the low-speed rotor rapidly decreases, and the angular displacement difference between the two rotors rapidly increases, when the maximum transmission torque is less than the load torque, the low-speed rotor continues to decrease in speed, and the angular displacement difference between the two rotors continues to expand. Regardless of the change of the angular displacement difference, the transmission torque is less than the load torque, and the load torque will reduce the speed of the low-speed rotor to 0. In this process, the transmission torque received by the high-speed rotor gradually increases and alternates between positive and negative maximum values. The above analysis shows that when the overload occurs, the speed of the low-speed rotor gradually decreases to 0, the speed of the high-speed rotor changes and starts to oscillate, the angular displacement difference between the high-speed rotor and the low-speed rotor continuously expands, and the air turbine starter can still work normally after the load is removed, which reflects the advantages of automatic overload protection.

[0013] The instability in the rotation process caused by the magnetic connection between the stator assembly structure and the input rotor assembly structure and the output rotor assembly structure is solved, the air turbine starter based on the magnetic gear transmission is provided with an output stator positioning sleeve in the shell and the guider assembly, the outer cylindrical surface of the output rotor assembly structure positioning sleeve is provided with eight uniformly distributed rollers, the output rotor assembly structure positioning sleeve is sleeved on the outer cylindrical surface of the output rotor assembly structure magnetic ring, the radial displacement of the output rotor assembly structure can be effectively limited, and the stability of the rotation process is improved. Meanwhile, the inner surface of the output rotor magnetic ring in the output rotor assembly structure is designed as a dovetail structure, which is used for fixing the output rotor permanent magnet. The output main shaft and the output end driven shaft welding piece in the output rotor assembly structure transmit power through the overrunning clutch, the reverse driving of the air turbine starter is prevented, and the stability is further improved.

[0014] In addition, the technical scheme provided by the embodiment of the application can also have the following additional technical features:

[0015] In any of the above technical schemes, one end of the first annular cavity is in communication with the hollow portion, and the other end is in communication with the inside of the shell and guider assembly structure; the shell and guider assembly structure are provided with the stator assembly structure in the first annular cavity, and the connection between the stator assembly structure and the shell and guider assembly structure is located in the communication between the first annular cavity and the inside of the shell and guider assembly structure.

[0016] In the technical solution, the first annular cavity can be used for mounting the stator assembly structure, and the internal flowing air is guided through the gap between the stator assembly structure and the input rotor assembly structure and the output rotor assembly structure, and the stator assembly structure is fixed at the connection between the housing and the guider assembly structure, and is arranged in the communication between the first annular cavity and the inside of the housing and the guider assembly structure, so that the uneven fixed connection is added at the end of the air guiding flow, the uniformity of the gap between the stator assembly structure and the input rotor assembly structure and the output rotor assembly structure is ensured, the interference to the air flow in the device is further reduced, the rotation of the input rotor assembly structure and the output rotor assembly structure is more stable, and the energy loss and the body wear are reduced.

[0017] In any of the above technical solutions, the housing and the guider assembly structure comprise a clamping part, the clamping part is circumferentially assembled on the output shaft, and the clamping part is located on the side of the connecting part away from the output rotor assembly structure; and two groups of first support components are arranged at the assembly position of the clamping part and the output shaft.

[0018] In the technical solution, since the input rotor assembly structure and the output rotor assembly structure are located on one side of the connecting part, and the output rotor assembly structure is connected with the output shaft, if the guiding and clamping structure is not used, vibration or eccentric motion may occur in high-speed rotation, force transmission is unstable, loss is increased, and therefore the clamping part is circumferentially arranged on the other side of the connecting part for guiding and clamping the output shaft, the output rotor assembly structure and the connecting structure of the output shaft have two end guiding rotation parts, and the stability of high-speed working parts in the device is further improved.

[0019] In any of the above technical solutions, the support mechanism comprises: a support stator, one end of the support stator is connected with the housing and the guider assembly structure, and the other end of the support stator is arranged in the communication between the first annular cavity and the hollow part; two second support components are arranged for connecting the support stator and the input rotor assembly structure; and a third support component is arranged for connecting the support stator and the output shaft, and the third support component is located between adjacent second support components in the axial direction of the output shaft.

[0020] In the technical solution, the support mechanism is arranged as a support stator with an annular fixed structure in the middle, and a three-point support positioning structure is arranged at the two ends of the support stator, and the three-point support positioning structure is not in a straight line, so that the third support component and the second support component form a triangular stable support structure at the same end, and the stability of the support structure in the rotation between the output shaft of the output rotor assembly structure and the input rotor assembly structure is ensured.

[0021] There is a certain sub-assembly structure between the input rotor assembly structure and the output rotor assembly structure, and a support point is arranged between the input rotor assembly structure and the stator assembly structure by using an angular contact bearing; a support of a needle bearing is further arranged between the output rotor assembly structure and the stator assembly structure, so that the radial structure is more compact, and the entire structure is more stable in an inner support mode; the output rotor assembly structure is also supported by an angular contact ball bearing, and the input rotor assembly structure and the output rotor assembly structure are coaxially nested, so that the overall structure is more stable and lighter in quality.

[0022] In any of the above technical solutions, each of the first support assembly and the second support assembly includes at least one angular contact bearing, and the third support assembly includes a needle bearing.

[0023] In the technical solution, the input rotor assembly structure and the bearing stator are supported by an angular contact bearing to pursue stability at a high rotating speed and to enable the input rotor assembly structure to bear a large load; the output rotor and the stator assembly structure are supported by a needle bearing, so that the radial structure of the entire coaxial structure is more compact, and the overall quality is reduced.

[0024] In any of the above technical solutions, the input rotor assembly structure is provided with a power part in a circumferential direction at one end of the output rotor assembly structure protruding in an axial direction, and the power part is located on a side of the connection away from the output rotor assembly structure.

[0025] In the technical solution, the power part is arranged at one end of the input rotor assembly structure protruding in the output rotor assembly structure in the axial direction, and the power part is further located on a side of the connection away from the output rotor assembly structure, so that the influence of external airflow on the rotation of the final output rotor assembly structure is reduced when the airflow drives the power part, and the interference of flowing air on the internal rotating structure is further reduced.

[0026] In any of the above technical solutions, the radial distances of the rolling element centers of the needle bearing, the angular contact bearing of the first support assembly and the angular contact bearing of the second support assembly from the output shaft axis are not equal.

[0027] In the technical solution, the rolling centers of the bearings are arranged at different positions in the radial direction relative to the position of the output shaft axis, so that the damage of excessive axial force to the bearing structure is avoided, and the stable rotation of the input rotor assembly structure, the output rotor assembly structure and the output shaft in rotation is ensured by arranging the bearings at different radial positions.

[0028] In any of the above technical solutions, the clamping part, the input rotor assembly structure, the output rotor assembly structure, the stator assembly structure and the third support assembly are located on the connection part along the projection of the output shaft axis, and the third support assembly and the support stator are located on the output shaft along the projection of the output shaft axis.

[0029] In the technical scheme, when arranging the positions of the structures, the annular area of the connecting part is considered in advance, and the projections of the clamping part, the input rotor assembly structure, the output rotor assembly structure and the stator assembly structure in the axial direction are all located on the connecting part, and the annular area of the connecting part is limited and reduced according to the size of each structure in use, so that the overall structure is more compact, the radial length can be effectively reduced, and the input rotor assembly structure, the stator assembly structure, the output rotor assembly structure, the support structure and the corresponding steps of the output shaft on the support structure adopt a structure of layer-by-layer sleeving, so that the axial multi-section arrangement defect can be effectively reduced, and the axial size of the whole device can be reduced.

[0030] The first aspect of the application also provides an air turbine starter, comprising: a housing, a guider assembly structure and a magnetic gear; wherein the magnetic gear uses the magnetic gear rotor support structure according to any one of the first aspect.

[0031] The air turbine starter according to the first aspect of the application has all the beneficial effects of the magnetic gear rotor support structure, which will not be repeated here.

[0032] Compared with the prior art, the application has the following beneficial effects:

[0033] The total length of the rotor and the radial size of the rotor are reduced to the maximum extent, and the total weight of the starter is reduced; compared with the traditional planetary gear starter, the magnetic gear of the application reduces the complex support structure and components, and selects the coaxial nesting mode of the inner rotor and the outer rotor as the support scheme, the input rotor assembly structure as the inner rotor and the output rotor assembly structure as the outer rotor, thereby reducing the complexity of the whole system, the stator core assembly in the magnetic gear stator assembly is fixed by the stator support frame, and the structure of the connecting bridge is cancelled, thereby further reducing the total weight of the starter.

[0034] The inner rotor and the outer rotor can be independent of each other except for the coupling effect of the magnetic field, thereby reducing the complexity of the whole rotor structure;

[0035] The inner rotor and the outer rotor do not produce direct contact in the working process, and the vibration and noise are small;

[0036] The magnetic gear has an overload protection function, that is, in an overload condition, the magnetic gear can protect the structure from physical damage by out-of-step operation; when the overload occurs, the resultant moment received by the low-speed rotor suddenly increases, the rotation speed of the low-speed rotor rapidly decreases, and the angular displacement difference between the two rotors rapidly increases; when the maximum transmission torque is less than the load torque, the low-speed rotor continues to decrease in speed, and the angular displacement difference between the two rotors continues to expand. Regardless of how the angular displacement difference changes, the transmission torque is less than the load torque, and the load torque will reduce the speed of the low-speed rotor to 0. In this process, the transmission torque received by the high-speed rotor gradually increases and alternates between positive and negative maximum values. The above analysis shows that when the overload occurs, the speed of the low-speed rotor gradually decreases to 0, the speed of the high-speed rotor changes and starts to oscillate, the angular displacement difference between the high-speed rotor and the low-speed rotor continuously expands, and the air turbine starter can still work normally after the load is removed, which embodies the advantages of automatic overload protection and is of great significance.

[0037] The instability in the rotation process caused by the magnetic connection between the stator assembly structure and the input rotor assembly structure and the output rotor assembly structure is solved. In the air turbine starter based on the magnetic gear transmission in the patent, an output stator positioning sleeve is installed in the shell and the guider assembly, and eight rollers are uniformly distributed on the inner cylindrical surface of the output rotor positioning sleeve. The output rotor positioning sleeve is sleeved on the outer cylindrical surface of the output rotor magnetic ring, which can effectively limit the radial displacement of the output rotor and improve the stability of the rotation process. Meanwhile, a dovetail structure is designed on the inner surface of the output rotor magnetic ring in the output rotor assembly, which is used to fix the output rotor permanent magnet. The output main shaft and the output end driven shaft welding piece in the output rotor assembly transmit power through the overrunning clutch, which can prevent the reverse driving of the air turbine starter and further improve the stability.

[0038] Additional aspects and advantages of embodiments according to the present application will become apparent from the following description with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments contemplated for the present application and together with the description serve to explain the principles of the application.

[0040] Figure 1 It is a single-sided structure schematic diagram of the magnetic gear rotor support structure of the present application.

[0041] Figure 2 It is a support scheme of the prior art of the present application.

[0042] Figure 3 It is a support scheme of the prior art of the present application.

[0043] Figure 4 It is a support scheme of the prior art of the present application.

[0044] Figure 5 Supporting scheme of the prior art for the present application;

[0045] Figure 6 Structure diagram of the magnetic gear output rotor assembly structure for another embodiment of the present application;

[0046] Figure 7 Structure diagram of the magnetic gear input rotor assembly structure for another embodiment of the present application;

[0047] Figure 8 Structure diagram of the air turbine starter housing and guider assembly structure for another embodiment of the present application;

[0048] Figure 9 Sectional view diagram of the magnetic gear stator assembly structure for another embodiment of the present application.

[0049] Wherein, Figures 1-5 The correspondence between the reference signs and the component names is as follows:

[0050] 1 housing and guider assembly structure, 2 input rotor assembly structure, 206 angular contact bearing, 3 output rotor assembly structure, 305 output shaft, 312 needle bearing, 4 stator assembly structure, 5 supporting stator. DETAILED DESCRIPTION

[0051] In order to make the above objects, features and advantages of the present application more clearly understood, the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0053] Please refer to Figures 1-5 , the magnetic gear rotor supporting structure of some embodiments of the present application will be described below.

[0054] The embodiments of the first aspect of the present application propose a magnetic gear rotor supporting structure. In some embodiments of the present application, as shown in Figures 4-5 , an air turbine starter having the magnetic gear rotor supporting structure is provided, the air turbine starter comprising:

[0055] The housing and guider assembly structure 1 and the magnetic gear;

[0056] The magnetic gear comprises an input rotor assembly structure 2, an output rotor assembly structure 3 and a magnetic gear stator assembly structure 4;

[0057] The output rotor assembly structure 3, the magnetic gear stator assembly structure 4 and the input rotor assembly structure 2 are sleeved with each other and are all installed on the housing and the guider assembly structure 1;

[0058] The inner wall of the housing and the guider assembly structure 1 and the outer wall of the output rotor assembly structure 3, the output rotor assembly structure 3 and the magnetic gear stator assembly structure 4 and the magnetic gear stator assembly structure 4 and the input rotor assembly structure 2 are all arranged at intervals so that the gas flows through.

[0059] The embodiments of the first aspect of the application provide a magnetic gear rotor support structure. In some embodiments of the application, as shown in Figures 1-3 A magnetic gear rotor support structure is provided:

[0060] The rotor comprises an output rotor assembly structure 3 and an input rotor assembly structure 2 which are arranged in the housing 1 of the magnetic gear in a split manner, and the output rotor assembly structure 3 is axially provided with a hollow portion for sleeving the input rotor assembly structure 2;

[0061] A first annular cavity is formed between the outer side of the input rotor assembly structure 2 and the inner side of the output rotor assembly structure 3, and the radial width of the first annular cavity is equal along the circumference of the input rotor assembly structure 2;

[0062] The output rotor assembly structure 3 is circumferentially provided with a connecting portion at one end of the input rotor assembly structure 2, and the connecting portion is provided with an output shaft 305 which is coaxial with the input rotor assembly structure 2;

[0063] A second annular cavity is formed between the outer side of the output shaft 305 and the inner side of the input rotor assembly structure 2, and a support mechanism is arranged in the second annular cavity along the axis of the housing 1, and the support mechanism is connected with the input rotor assembly structure 2 and the output shaft 305 respectively to support the output rotor assembly structure 3 and the input rotor assembly structure 2.

[0064] The magnetic gear rotor support structure provided by the application reduces the total length of the rotor and the radial size of the rotor to the greatest extent, reduces the total weight of the starter, compared with the traditional planetary gear starter, the magnetic gear of the application reduces the complex support structure and components, and selects the coaxial nesting mode of the input and output rotors as the support scheme, which reduces the complexity of the whole system, the stator core assembly in the magnetic gear stator assembly is fixed by the stator support frame, the structure of the connecting bridge is cancelled, and the total weight of the starter is further reduced;

[0065] By forming the first annular cavity between the input rotor assembly structure 2 and the output rotor assembly structure 3 for placing the stator assembly structure 4, on the one hand, the stator assembly structure 4 can be spaced apart from the input rotor and the output rotor, and on the other hand, the output rotor can be independent of the output rotor except for the magnetic field coupling effect, thereby reducing the complexity of the entire rotor structure.

[0066] By forming the first annular cavity with a radial width equal in the circumferential direction of the input rotor assembly structure 2, the input rotor and the output rotor do not directly contact each other during high-speed rotation, and the vibration and noise are small.

[0067] The magnetic gear has an overload protection function, that is, in an overload condition, the magnetic gear can run out of step to protect the structure from physical damage. When the overload occurs, the resultant moment acting on the low-speed rotor suddenly increases, the rotational speed of the low-speed rotor rapidly decreases, and the angular displacement difference between the two rotors rapidly increases. When the maximum transmission torque is less than the load torque, the low-speed rotor continues to slow down, and the angular displacement difference between the rotors continues to expand. Regardless of the change in the angular displacement difference, the transmission torque is less than the load torque, and the load torque will reduce the speed of the low-speed rotor to 0. During this process, the transmission torque acting on the high-speed rotor gradually increases and alternates between positive and negative maximum values. As can be seen from the above analysis, when the overload occurs, the speed of the low-speed rotor gradually decreases to 0, the speed of the high-speed rotor changes and starts to oscillate, the angular displacement difference between the high-speed rotor and the low-speed rotor continuously expands, and the air turbine starter can still work normally after the load is removed, which reflects the advantages of automatic overload protection.

[0068] The instability in the rotation process caused by the magnetic force between the stator assembly structure 4 and the input rotor assembly structure 2 and the output rotor assembly structure 3 is solved. The air turbine starter based on the magnetic gear transmission is provided with an output stator positioning sleeve in the housing and the guide assembly. The inner cylindrical surface of the output rotor positioning sleeve is provided with eight uniformly distributed rollers, and the output rotor positioning sleeve is sleeved on the outer cylindrical surface of the output rotor magnetic ring, which can effectively limit the radial displacement of the output rotor and improve the stability of the rotation process. Meanwhile, the inner surface of the output rotor magnetic ring in the output rotor assembly is designed as a dove tail structure, which is used to fix the output rotor permanent magnet. The output main shaft and the output end driven shaft welding piece in the output rotor assembly transmit power through the overrunning clutch, which can prevent the reverse driving of the air turbine starter and further improve the stability.

[0069] In some embodiments, one end of the first annular cavity is in communication with the hollow portion, and the other end is in communication with the interior of the housing 1.

[0070] The housing 1 is provided with the stator assembly structure 4 in the first annular cavity, and the connection between the stator assembly structure 4 and the housing 1 is located in the communication between the first annular cavity and the interior of the housing 1.

[0071] In this embodiment, the first annular cavity can not only be used for mounting the stator assembly structure 4, but also guide the internal airflow through the gap between the stator assembly structure 4 and the input rotor and the output rotor, and by fixing the stator assembly structure 4 at the connecting portion of the housing 1 to set the connecting portion in the communication between the first annular cavity and the inside of the housing 1, the uniformity of the first annular cavity can be ensured, the uniformity of the gap between the stator assembly structure 4 and the input rotor and the output rotor can be ensured, the interference to the airflow in the device can be further reduced, the rotation of the input rotor and the output rotor can be more stable, and the energy loss and the wear of the device can be reduced.

[0072] In some embodiments, the housing 1 comprises a clamping portion which is circumferentially arranged on the output shaft 305 and located on the side of the connecting portion away from the output rotor assembly structure 3.

[0073] In this embodiment, the clamping portion and the output shaft 305 are arranged with two sets of first support assemblies at the assembly position.

[0074] In this embodiment, the input rotor and the output rotor are located on one side of the connecting portion, and the clamping portion for guiding and clamping the output shaft 305 is circumferentially arranged on the other side of the connecting portion, so that the two end guiding rotation portions of the connecting structure of the output rotor and the output shaft 305 can be guided, the stability of the high-speed working components in the device can be further improved, the vibration or eccentric motion in high-speed rotation can be reduced, the transmission stability can be improved, and the loss can be reduced.

[0075] In some embodiments, the support mechanism comprises:

[0076] The support stator 5 is connected to the housing 1 at one end away from the connecting portion and arranged in the communication between the first annular cavity and the hollow portion at the other end.

[0077] The second support assembly is arranged at least twice to connect the support stator 5 and the input rotor assembly structure 2.

[0078] The third support assembly is arranged to connect the support stator 5 and the output shaft 305, and is axially arranged between adjacent second support assemblies along the output shaft 305.

[0079] In this embodiment, the support mechanism is arranged as a support stator 5 with a ring-shaped fixing structure in the middle, and a three-point support positioning structure is arranged at the two ends of the support stator 5, which is composed of two second support assemblies and one third support assembly, and is not arranged in a straight line, so that the third support assembly and the second support assembly form a triangular stable support structure at the same end, and the stable guiding and supporting of the support structure to the output shaft 305 of the output rotor and the input rotor in rotation are ensured.

[0080] In some embodiments, each of the first and second support assemblies includes at least one angular contact bearing 206, and the third support assembly includes a needle bearing 312.

[0081] In this embodiment, the input rotor is supported between the bearing and the stator by angular contact bearings to pursue stability at high rotational speeds while being able to withstand large loads, and the output rotor is supported between the bearing and the stator by a needle bearing 312 to make the radial structure of the entire coaxial structure more compact and reduce the overall mass.

[0082] In some embodiments, the power unit is circumferentially disposed on one end of the input rotor assembly structure 2 protruding from the output rotor assembly structure 3 in the axial direction, and is located on the side of the connection away from the output rotor assembly structure 3.

[0083] In this embodiment, the power unit is disposed on one end of the input rotor assembly structure 2 protruding from the output rotor assembly structure 3 in the axial direction, and is further located on the side of the connection away from the output rotor assembly structure 3, which can reduce the influence of the external airflow on the rotation of the final output rotor assembly structure 3 when the power unit is driven by the airflow, and further reduce the interference of the flowing air with the internal rotating structure.

[0084] In some embodiments, the radial distance from the center of the rolling body of the needle bearing 312 and the angular contact bearings 206 of the first and second support assemblies to the axis of the output shaft 305 is not equal.

[0085] In this embodiment, the rolling centers of the bearings are arranged at different positions in the radial direction relative to the position of the output shaft, which can avoid damage to the bearing structure caused by excessive axial force, and the arrangement of multiple bearings at different radial positions ensures stable rotation of the input rotor, the output rotor, and the output shaft 305 during rotation.

[0086] In some embodiments, the clamping portion, the input rotor assembly structure 2, the output rotor assembly structure 3, and the stator assembly structure 4 are all located on the connection portion along the projection of the second support assembly output shaft 305 axis;

[0087] and the third support assembly and the support stator 5 are both located on the output shaft 305 along the projection of the output shaft 305 axis.

[0088] In this embodiment, when arranging the positions of the structures, the annular area of the connecting portion is taken into account, and the clamping portion, the input rotor assembly structure 2, the output rotor assembly structure 3, the stator assembly structure 4, and the projection of the second support assembly output shaft 305 axis in the axial direction are all located on the connecting portion, and the annular area of the connecting portion is limited and reduced according to the size of each structure in specific use, so that the overall structure is more compact, the radial length can be effectively reduced, and the input rotor, the stator assembly structure 4, the output rotor, the support structure, and the output shaft 305 corresponding to the support structure adopt a structure of layer-by-layer sleeving, which can effectively reduce the axial multi-section arrangement defects and reduce the overall axial size of the device.

[0089] Embodiments of the first aspect of the application provide a magnetic gear rotor support structure. In some embodiments of the application, a magnetic gear stator assembly structure is provided in the same air turbine starter as the magnetic gear rotor support structure, and the magnetic gear stator assembly structure comprises:

[0090] a housing and a guide assembly 1, an input rotor assembly 2, an output rotor assembly 3, and a magnetic gear stator assembly 4;

[0091] the output rotor assembly 3, the magnetic gear stator assembly 4, and the input rotor assembly 2 are sleeved with each other and are all installed in the housing and the guide assembly 1;

[0092] wherein the inner wall of the housing and the guide assembly 1, the outer wall of the output rotor assembly 3, the output rotor assembly 3 and the magnetic gear stator assembly 4, and the magnetic gear stator assembly 4 and the input rotor assembly 2 are all spaced apart to allow gas to flow through.

[0093] Embodiments of the first aspect of the application provide a magnetic gear stator assembly structure. In some embodiments of the application, as shown in Figures 1-2 , 5, a magnetic gear stator assembly structure is provided between the input rotor and the output rotor, and the magnetic gear stator assembly structure comprises:

[0094] a stator support frame 402, the stator support frame 402 comprising a plurality of support plates arranged at equal intervals in the circumferential direction and a plurality of mounting portions arranged between adjacent two support plates;

[0095] a stator core assembly 401, the stator core assembly 401 comprising a plurality of stator cores arranged at equal intervals in the axial direction, and the stator cores are inserted into the mounting portions and are in interference fit with the adjacent two support plates constituting the mounting portions;

[0096] the axis of the support plate is horizontal to the axis of the stator core; and a groove is formed between the adjacent two stator cores and the support plate;

[0097] a stator injection filler 403 filled in the groove;

[0098] A stator end plate 404 is used in cooperation with the stator support frame 402 to fix the stator core assembly 401 between two adjacent support plates.

[0099] The magnetic gear stator assembly structure provided by the application cancels the connecting bridge structure of the stator core 401 and uses the stator support frame 402 for fixation, has better torque performance, can transmit greater torque compared with the structure with the connecting bridge, and improves the torque performance by 5%-50%. Meanwhile, compared with the existing double connecting bridge, inner connecting bridge and outer connecting bridge, the efficiency can be improved by 3%. And the end leakage magnetic field is less.

[0100] Specifically, the stator is composed of the stator support frame 402, the core and the stator injection material, the inner and output rotor surfaces are attached with permanent magnets, and the magnetic conductive and non-magnetic material blocks are arranged in intervals to form a magnetic modulation ring. Considering that the stator core has a high alternating magnetic field frequency, the core is stacked by using amorphous material, and the loss is relatively low in the high-frequency state. At the same time, the support frame is made of 7075 aluminum alloy which has low density and is non-magnetic, which not only reduces the weight of the speed reducer, but also does not affect the magnetic field of the inner rotor and the magnetic modulation stator. The support frame structure is arranged in intervals and filled with thermosetting material to improve the structural strength and reduce the weight. There is a layer of annular air-filled uniform gap between the inner rotor, the output rotor and the stator.

[0101] Due to the low torque performance requirement, and due to the inertia thinking that the connecting bridge can increase the structural strength, in fact, without the connecting bridge, the torque performance can be better than other structures, and even by changing the structure, using the support frame and filling the support frame structure interval with thermosetting material to improve the structural strength and reduce the weight, on the premise of greatly improving the performance, the structural strength and cost can still meet the requirements of the structure with the connecting bridge. For the magnetic gear stator assembly 4 in the air turbine starter of the application, the stator support frame 402 is provided, which can reduce the block of the stator core along the radial direction of the stator support frame on the basis of ensuring the mechanical strength of the stator assembly 4, and improve the magnetic field modulation performance of the stator core 401. And such a structure of the gear stator without the connecting bridge can bring more obvious torque transmission effect, and the torque performance is also one of the important performance parameters of the magnetic speed reducer, which can directly reflect the working characteristics, maximum working torque and carrying capacity of the magnetic speed reducer.

[0102] In some embodiments, a plurality of bolts are assembled on the stator end plate 404, the support plate is provided with holes matched with the bolts in the axial direction of the stator assembly 4, and the side wall of the end of the stator support frame 402 away from the support plate is provided with a fixing hole; and / or

[0103] The stator end plate 404 is provided with a positioning groove near one end surface of the stator support frame 402, and the stator core 401 is provided with a positioning block inserted into the positioning groove.

[0104] In this embodiment, the stator support frame 402 is connected to the outside through the fixing hole, and the stator end plate 404 is assembled and fixed to the support plate through bolts, specifically, the axis of the hole is perpendicular to the axis of the fixing hole.

[0105] For the positioning groove on the stator end plate 404, the stator core 401 is clamped and positioned through the positioning groove and the positioning block, thereby realizing the radial positioning of the stator core 401.

[0106] In some embodiments, the stator support frame 402 is a circumferential ring structure and has an axis;

[0107] A plurality of support plates are arranged circumferentially along the axis;

[0108] The mounting portion is connected to the inside of the stator support frame 402 and is arranged through the stator support frame 402 in the radial direction.

[0109] In this embodiment, in order to control the output rotor and the input rotor, the stator support frame 402 is arranged as a circumferential ring structure, so that it has an axis;

[0110] The mounting portion is arranged through the stator support frame 402 in the radial direction, so that the stator core 401 can be exposed in the radial direction of the stator support frame 402 after clamping and fixing, thereby further improving the utilization efficiency of the core.

[0111] In some embodiments, the wall thickness of the support plate gradually increases from inside to outside along the radial direction of the stator support frame 402, so that the support plate forms two inclined side walls;

[0112] The axis is located in the plane of the inclined side walls of all the support plates;

[0113] The side wall matched with the stator core 401 is parallel to the inclined side wall, and / or the side wall matched with the stator core 401 is provided with a mounting groove for accommodating the end portion of the support plate.

[0114] In some embodiments, the groove includes a first groove and a second groove arranged in the radial direction of the stator support frame 402;

[0115] An outer air gap is formed between the stator assembly 4 and the output rotor and is connected to the first groove;

[0116] An inner air gap is formed between the stator assembly 4 and the input rotor and is connected to the second groove.

[0117] In this embodiment, by dividing the groove along the stator support frame 402 into a first groove and a second groove, and filling the stator injection material 403 in the grooves respectively, the smoothness of the inner and outer walls of the stator support frame 402 can be optimized after the stator core assembly is installed.

[0118] In some embodiments, the outer air gap and the inner air gap are coaxially arranged with the shaft center;

[0119] The thickness of the outer air gap and the inner air gap along the radial direction of the stator support frame 402 is equal, and the thickness of the inner air gap is calculated using the following formula:

[0120] h in =k*maxU total +Z;

[0121] wherein h in is the thickness of the inner air gap, k is a safety margin coefficient, maxU total is the change in thickness of the inner air gap during operation of the input rotor, and Z is the thermal expansion of the input rotor;

[0122] For the thickness of the inner air gap of the stator assembly 4, maxU total <0.22mm, Z=0.15mm, k=1.5, the following formula needs to be satisfied:

[0123] h in >0.22*1.5+0.15, and h in =0.5mm under the condition of considering the manufacturing cost.

[0124] In this embodiment, first, during the structural design, since the magnetic adjusting stator is designed at the beginning, the loss coefficient is reduced to reduce the core loss, thereby reducing the loss coefficient in material selection and size design;

[0125] Secondly, the thickness of the inner and outer air gaps of the magnetic gear reducer affects the magnetic field distribution of the system, and the change of the air gap directly affects the performance of the entire magnetic reducer. Therefore, by analyzing the following three cases (1) only changing the loss under the inner air gap (2) only changing the loss under the outer air gap (3) changing the loss under the inner and outer air gaps together, the relationship between the magnetic loss and the air gap thickness is determined, and the optimal air gap thickness is calculated to be 0.5mm by adding variables such as load and vibration in the Abaqus software;

[0126] In addition, in considering the influence of end leakage on torque performance, a three-dimensional finite element analysis model of four different structure magnetic reducers is established, and the static torque change graph of the output rotor of different structure magnetic reducers considering the end leakage effect is obtained. It is found that the structure without connecting bridge can reduce the magnetic resistance between the inner output rotor, and more magnetic lines can reach the output rotor permanent magnet, thereby reducing the magnetic lines in the air domain and reducing the end leakage effect.

[0127] Further, the U total The change amount of the thickness of the inner air gap of the input rotor during the working process is calculated by the following formula:

[0128] maxU total = u1+u2+u3;

[0129] Wherein, u1 is the displacement change amount caused by centrifugal load and torque load, u2 is the displacement change amount caused by vibration, and u3 is the process tolerance of the reducer;

[0130] Specifically, u1 is based on the finite element platform, and the maximum displacement caused by centrifugal force is 0.0803mm after applying the maximum load of 45000rpm. u2 is based on the finite element platform, and the input rotor is subjected to harmonic response analysis. Since the input rotor speed of the reducer is not higher than 45000rpm, the highest frequency is less than 750Hz, so the input rotor will not have resonance phenomenon in actual work. The maximum value of the input rotor vibration displacement under 750Hz frequency is less than 0.0005mm. The tolerance of the magnetizing ring stator is 0.046mm, and the tolerance of the input rotor permanent magnet sheath is 0.074mm, so the total tolerance u3 will not exceed 0.12mm.

[0131] In some embodiments, on the same stator assembly structure, the circumferential angle of the magnetic conductive material in the stator assembly structure is θ sp , the circumferential angle of the non-magnetic conductive material in the stator assembly structure is τ sp , and the slotting rate of the stator assembly structure is α, which satisfies the following formula:

[0132]

[0133] Wherein, the value of α is [0, 1], and the slotting rate α is the opening rate of the mounting portion along the circumferential direction of the stator assembly structure.

[0134] It can be understood that the stator core is a magnetic conductive material, the support plate and the filling material are non-magnetic conductive materials;

[0135] Under the same magnetic field intensity of the same stator core group, the output torque of the input rotor and the output rotor under different slotting rates of the stator assembly structure is calculated, and the slotting rate corresponding to the maximum output torque is obtained, that is, alpha=0.45.

[0136] In this embodiment, the gear stator structure is optimized to work better. The output torque under different slotting rates of the magnetic adjusting ring is studied, and the optimal slotting rate of the magnetic adjusting ring 0.45 is selected, which improves the output torque by 4Nm. The structure parameters of the magnetic adjusting stator are optimized by the surface response method and the genetic algorithm. Without reducing the peak torque of the coaxial magnetic gear, the optimal parameter combination is found, which effectively improves the stability of the magnetic adjusting stator structure.

[0137] In some embodiments, the stator support frame 402 is made of 7075 aluminum alloy, the magnetic conducting part of the stator core 401 is composed of amorphous laminations stacked together, and the stator injection filler 403 is a thermosetting plastic.

[0138] In this embodiment, the magnetic gear stator assembly 4 includes a stator core 4011, a stator support frame 402, a stator injection filler 403 and a stator end plate 404. The material of the stator core 401 is amorphous soft magnetic material, the material of the stator support frame 402 is 7075 aluminum alloy, the stator core 401 is installed in the partitioned middle part of the stator support frame 402 through interference connection, and is uniformly distributed in the circumferential direction. The stator injection filler 403 is made of thermosetting plastic and is filled in the inner and outer gaps of the stator support frame 402, so that the stator assembly 4 becomes a cylinder. The stator end plate 404 is connected with the stator support frame 402 through bolts.

[0139] Embodiments of the first aspect of the application provide a magnetic gear rotor support structure. In some embodiments of the application, a magnetic gear output rotor assembly structure is provided in the same air turbine starter as the magnetic gear rotor support structure, and the magnetic gear output rotor assembly structure comprises:

[0140] A first shaft body is used to connect with an external driven end and output power generated by the output rotor assembly structure;

[0141] A second shaft body is provided with a through hole for sleeving the second shaft body in the first shaft body in the axial direction, and the first shaft body and the second shaft body are arranged in a one-way transmission mode;

[0142] A magnetic part is used to connect with the second shaft body and transmit torsional force, and the magnetic part comprises a plurality of output rotor permanent magnet assemblies 301 and an output rotor magnetic conducting ring 302 for connecting the output rotor permanent magnet assemblies 301 with the second shaft body;

[0143] The inner wall of the output rotor magnetic ring 302 is provided with a plurality of grooves for mounting the rotor permanent magnet assembly along the circumference, and the groove width gradually decreases from the bottom to the opening.

[0144] The output rotor permanent magnet assembly 301 is inserted into each groove along the axial direction of the second shaft body, and the output rotor permanent magnet assembly 301 is composed of at least two permanent magnets along the circumferential direction of the second shaft body.

[0145] The magnetic gear output rotor assembly structure provided by the application designs a plurality of dovetail structure grooves in the inner wall of the output rotor magnetic ring 302, and uses epoxy resin to fix the output rotor permanent magnet assembly 301, which can effectively fix the output rotor permanent magnet assembly 301.

[0146] The power transmission is realized by the one-way transmission of the first shaft body and the second shaft body, which can prevent the second shaft body from being driven by the first shaft body in the reverse direction and simplify the structure.

[0147] Further, the radial magnetized permanent magnets are evenly divided into multiple blocks and are fixed. That is, each single permanent magnet is evenly divided into multiple blocks based on the above-mentioned permanent magnet assembly, and is still fixed at the installation position. After being divided into blocks, the permanent magnets are installed as a whole magnetic pole. Thus, the eddy current loss of the permanent magnet is reduced, and the permanent magnet assembly of the output rotor assembly in the improved air turbine starter magnetic gear reducer is divided into blocks in the circumferential direction, which can effectively reduce the iron loss of the permanent magnet.

[0148] In some embodiments, the outer wall of the second shaft body is formed with an extension edge along the circumference, and the inner wall of the output rotor magnetic ring 302 is provided with an annular groove opposite to the edge of the extension edge, and the annular groove is communicated with the groove.

[0149] The side wall edge of the extension edge is formed with a positioning plate along the circumference, and the rib plate is formed between the adjacent grooves and abuts against the positioning plate.

[0150] In this embodiment, when the second shaft body and the output rotor magnetic ring 302 are installed, the outer wall of the second shaft body is extended to form an extension edge, which can increase the circumferential installation size of the second shaft body, facilitate the installation and connection of the output rotor magnetic ring 302 with a larger diameter, and the surface of the output rotor magnetic ring 302 for mounting the output rotor permanent magnet assembly 301 is larger, so that more output rotor permanent magnet assemblies 301 can be installed, and it is easy to cooperate with the external stator. By forming the positioning plate along the circumference of the extension edge, the annular groove can be abutted to position the output rotor magnetic ring 302, and the positioning plate can be abutted with the rib plate after abutting, so that the output rotor permanent magnet assembly 301 placed in the groove is limited on one side, which is helpful for the stable installation of the output rotor permanent magnet assembly 301.

[0151] Specifically, the end face of the output rotor magnetic ring 302 is provided with an opening communicated with the annular groove, and the extension edge is provided with an insertion block capable of being inserted into the opening, so that the output rotor magnetic ring 302 and the second shaft body with the extension edge are engaged and fixed, and the insertion block and the opening are fixed by a threaded bolt in the axial direction of the output rotor magnetic ring 302, so as to form a fixed assembly in the axial and radial directions.

[0152] In some embodiments, the second shaft body and the first shaft body are connected through a transmission mechanism, and the transmission mechanism is used to make the first shaft body follow the second shaft body rotating in a preset direction or the second shaft body not follow the first shaft body rotating in an opposite direction.

[0153] In this embodiment, the second shaft body and the first shaft body are connected through a transmission mechanism and realize one-way transmission, so as to realize the transmission mechanism used to make the first shaft body follow the second shaft body rotating in a preset direction or the second shaft body not follow the first shaft body rotating in an opposite direction, and avoid the second shaft body being driven to rotate by external reverse torsional force.

[0154] Specifically, the transmission mechanism is an output clutch.

[0155] Specifically, the first shaft body is an output driven shaft 306, the second shaft body is an output main shaft 303, the output shaft assembly includes the output main shaft 303, the output driven shaft 306, an output spline shaft 305, and an output clutch; the output driven shaft 306 and the output spline shaft 305 are welded to form a driven shaft welding assembly; the driven shaft welding assembly and the output main shaft 303 are connected through the output clutch; the output clutch is an overrunning clutch 304, which is a one-way clutch, thereby preventing the air turbine starter from being driven in reverse.

[0156] In some embodiments, the end portion of the first shaft body close to the magnetic part expands radially outward to form a first expansion edge communicated with the through hole, and the edge portion of the extension edge close to the second shaft body expands axially to the magnetic part to form a second expansion edge;

[0157] The first expansion edge, the second expansion edge, and the outer wall of the second shaft body jointly form an annular accommodating cavity with an opening;

[0158] The transmission mechanism is installed at one end of the annular accommodating cavity close to the second shaft body.

[0159] In this embodiment, the first extension edge of the L-shaped row is formed by expanding the end of the first shaft body close to the magnetic part outward, to form a circumferential annular inner platform body in the through hole, and the extension edge is expanded close to the edge of the second shaft body towards the magnetic part, so that the single edge of the extension edge is Z-shaped after being cut along the axial direction of the first shaft body, and the edge close to the second shaft body forms an annular concave platform body, and the annular concave platform body and the annular inner platform body are oppositely arranged to form an annular accommodating cavity with an opening in cooperation with the outer wall of the second shaft body.

[0160] The transmission mechanism is arranged at one end of the annular accommodating cavity close to the second shaft body, so that the transmission mechanism can be directly arranged between the second shaft body and the first shaft body in the radial direction.

[0161] In some embodiments, the annular accommodating cavity is provided with an angular contact ball bearing B309 for connecting the second shaft body and the outer shell, and the outer wall of the first shaft body is connected with the outer shell through the angular contact ball bearing A308, and the end face of the angular contact ball bearing A308 is connected with the first extension edge; and / or

[0162] The outer wall of one end of the second shaft body is connected with the through hole through the needle bearing A311, the other end of the second shaft body is connected with the outer shell through the needle bearing B312, and the transmission mechanism is located between the needle bearing A311 and the needle bearing B312.

[0163] Further, bearing spacers 307 are arranged between the two angular contact ball bearings A308 and the two angular contact ball bearings B309 respectively to maintain the axial distance between the two bearings.

[0164] Further, the angular contact ball bearing A308 is provided with a shaft double-layer spiral elastic retainer 310 close to one end of the output end spline shaft for axial positioning of the angular contact ball bearing A308.

[0165] Further, the needle bearing A311 located between the first shaft body and the second shaft body is provided with a hole double-layer spiral elastic retainer 313 for axial positioning of the needle bearing A311.

[0166] In some embodiments, the height and length of the permanent magnet are the same as the height and length of the output rotor permanent magnet assembly 301 composed of the permanent magnet, and the width of the permanent magnet is smaller than the width of the output rotor permanent magnet assembly 301 composed of the permanent magnet.

[0167] In this embodiment, when a plurality of permanent magnets are combined to form the output rotor permanent magnet assembly 301, the rotor permanent magnet assembly is arranged in a transverse circumferential butt joint combination, so that the width of the rotor permanent magnet assembly increases, and the length and height remain unchanged, so as to be installed in the groove, and a plurality of output rotor permanent magnet assemblies 301 are continuously butt jointed and installed in the same groove.

[0168] In some embodiments, each of the permanent magnets is composed of two single permanent magnets spliced in the circumferential direction, so as to reduce the iron loss of the single permanent magnet without changing the volume of the single permanent magnet.

[0169] In this embodiment, the number of magnetic pole pairs on the inner rotor is 4, the number of magnetic pole pairs on the outer rotor is 29, and the number of magnetic adjusting stator blocks is 33.

[0170] Table 1 shows the change of the iron loss of the outer rotor permanent magnet, considering the circumferential block of the permanent magnet.

[0171]

[0172] Table 1 shows that, under different working conditions, the circumferential block of the output rotor permanent magnet can effectively reduce the iron loss of the permanent magnet.

[0173] In some embodiments, the inner diameter of the output rotor magnetic ring 302 is greater than the radial distance between the connection of the second shaft body and the first shaft body and the axis of the second shaft body.

[0174] In this embodiment, by making the inner diameter of the output rotor magnetic ring 302 greater than the radial distance between the connection of the second shaft body and the first shaft body and the axis of the second shaft body, the rotation of the first shaft body and the second shaft body located in the middle is more stable, and the increase of the force arm is beneficial to the driving of the first shaft body and the second shaft body.

[0175] Embodiments of the first aspect of the application provide a magnetic gear rotor support structure. In some embodiments of the application, a magnetic gear input rotor assembly structure is provided in the same air turbine starter as the magnetic gear rotor support structure, and the magnetic gear input rotor assembly structure comprises:

[0176] The rotor shaft, a hollow portion is provided in the rotor shaft along the axial direction for the external shaft body to pass through; the guide rotating component is arranged on the inner wall of the hollow portion, and is used to limit the axial movement between the external shaft body and the rotor shaft when the external shaft body and the rotor shaft produce relative rotation in the circumferential direction; the magnetic part is arranged on the outer side wall of the rotor shaft in the circumferential direction, and is used to generate a magnetic force with the external stator to drive the rotor shaft to rotate in the circumferential direction; the input rotor sheath 204 is arranged outside the magnetic part, and the distance between any point on the outer wall of the input rotor sheath 204 and the axis of the rotor shaft in the radial direction of the rotor shaft is a fixed value; wherein the distance between each pair of corresponding points on the opposite surfaces of the external stator and the input rotor sheath 204 in the radial direction of the rotor shaft is equal.

[0177] The magnetic gear input rotor assembly structure provided by the application can fix the magnetic part by arranging the input rotor sheath 204, which effectively prevents the magnetic part from falling off during high-speed rotation.

[0178] The distance between the surfaces is set by fixing the distance between any point on the outer wall of the input rotor sheath 204 and the axis of the rotor shaft in the radial direction of the rotor shaft, and by making the distance between each pair of corresponding points on the opposite surfaces of the external stator and the input rotor sheath 204 equal in the radial direction of the rotor shaft, so that the input rotor sheath 204 can ensure that the air gap between the input rotor and the external magnetism-adjusting stator has good uniformity, and further makes the aviation engine air turbine 201 starter have good reliability, stability and working performance.

[0179] Specifically, the air turbine 201 is integrally formed on the rotor shaft.

[0180] In some embodiments, a ring-shaped groove is coaxially formed on the outer wall of the rotor shaft, and at least one ring-shaped groove is formed in the axial direction of the rotor shaft, both ends of the ring-shaped groove are formed with a ring-shaped rib plate protruding from the bottom of the ring-shaped groove in the axial direction of the rotor shaft, and the magnetic part comprises an input rotor magnetism-guiding ring 202 abutting against the ring-shaped rib plate; wherein a strain cavity is formed between the input rotor magnetism-guiding ring 202, the ring-shaped rib plate and the ring-shaped groove.

[0181] In this embodiment, the ring-shaped rib plate is formed radially outward on the ring-shaped groove, and the input rotor magnetism-guiding ring 202 is abutted, so as to support the whole magnetic part, and the strain cavity is formed, so as to accommodate the volume when the rotor shaft is deformed radially or expanded radially by heat under the action of force in high-speed rotation, so as to avoid direct action on the input rotor magnetism-guiding ring 202, and further through the input rotor permanent magnet assembly acting on the input rotor sheath 204, to cause uneven surface in work.

[0182] In some embodiments, the guide-rotation assembly comprises a plurality of high-speed angular contact ball bearings 206 arranged at the end of the hollow part, the inner end faces of adjacent high-speed angular contact ball bearings 206 are connected by bearing retainer 207 to form a cover for the middle part of the inner wall of the hollow part; wherein the plurality of high-speed angular contact ball bearings 206 correspond to the input rotor sheath 204 and the air turbine 201 on the rotor shaft in the radial direction of the rotor shaft, respectively.

[0183] In this embodiment, the plurality of high-speed angular contact ball bearings 206 can assemble the rotor shaft and the shaft body of the external output rotor, and connect them in relative rotation, and the plurality of high-speed angular contact ball bearings 206 correspond to the input rotor sheath 204 and the air turbine 201 on the rotor shaft, respectively, so that the air turbine 201 and the corresponding rotor shaft position of the magnetic part corresponding to the input rotor sheath 204 are guided and supported, which ensures the stability of the rotor shaft in rotation, and further enhances the uniformity of the gap between the input rotor sheath 204 and the external stator in relative rotation.

[0184] Further, the inner wall of the hollow part and the outer end face of the high-speed angular contact ball bearing 206 are jointly installed with the input rotor damper 209 to suppress the vibration of the high-speed angular contact ball bearing 206 and reduce the occurrence of collision and friction.

[0185] Further, the inner wall of the rotor shaft is assembled with the locking ring 208 for limiting the high-speed angular contact ball bearing 206.

[0186] In some embodiments, the magnetic part further comprises an input rotor permanent magnet assembly 203 arranged between the input rotor sheath 204 and the input rotor magnetic conducting ring 202; the input rotor permanent magnet assembly 203 comprises a plurality of pairs of permanent magnets arranged along the circumferential direction of the input rotor magnetic conducting ring 202; wherein the magnetic poles of adjacent permanent magnets are different along the circumferential direction and the axial direction of the input rotor magnetic conducting ring 202.

[0187] In this embodiment, by arranging the input rotor permanent magnet between the input rotor sheath 204 and the input rotor magnetic conducting ring 202, the permanent magnet is clamped and limited by the complete inner wall of the input rotor sheath 204 and the input rotor magnetic conducting ring 202, further ensuring the stability of the rotor permanent magnet in rotation, so as to make the structure stable in long-term use.

[0188] In some embodiments, when the high-speed angular contact ball bearing 206 corresponds to the input rotor sheath 204 in the radial direction of the rotor shaft, the high-speed angular contact ball bearing 206 corresponds to the strain cavity; and / or the butt joint gap between the same pair of permanent magnets is arranged in the axial direction of the rotor shaft; and / or the rotor shaft is provided with a receiving part connected to the end face of the input rotor magnetic conducting ring 202.

[0189] In this embodiment, for the high-speed angular contact ball bearing 206 installed corresponding to the input rotor sheath 204 in the radial direction of the rotor shaft, by further arranging the high-speed angular contact ball bearing 206 corresponding to the strain cavity in the radial direction of the rotor shaft, the rotor shaft can be subjected to the eccentric force of the high-speed angular contact ball bearing 206, and the vibration and external protrusion absorption can be performed through the strain cavity, and the deformation can be far away from the annular rib plate, so as to ensure the uniformity of the gap in high-speed operation, further suppress the problem that the peak torque of the coaxial magnetic gear will obviously decrease, the amplitude of the pulsating torque, the starting response time and the iron loss will increase to a certain extent;

[0190] When two or more annular grooves are arranged, by arranging the butt joint gap of the two butt joint permanent magnets and the annular rib plate in the axial direction of the rotor shaft, the butt joint gap of the annular rib plate on the adjacent annular groove is staggered with the butt joint gap of the permanent magnet, so as to ensure that the gap between the stator and the input rotor sheath 204 remains stable and does not change when the rotor shaft is impacted;

[0191] The input rotor magnetic ring 202 is limited and fixed by the receiving part, avoiding the influence of vibration generated in high-speed rotation on the position of the input rotor magnetic ring 202, so that the radial relative position of the permanent magnet and the stator is stable.

[0192] Specifically, the strain cavity is a ring body, and gradually narrows radially outward, so that the end face of the strain cavity away from the input rotor magnetic ring 202 is smaller than the opposite face of the strain cavity and the input rotor magnetic ring 202, so as to reduce the force applied to the input rotor magnetic ring 202.

[0193] In some embodiments, one end of the outer wall of the input rotor magnetic ring 202 is equipped with an input rotor baffle 205, which is used to support the permanent magnet in the axial direction of the input rotor magnetic ring 202; wherein the permanent magnet is arranged in a containing cavity surrounded by the input rotor magnetic ring 202, the input rotor baffle 205 and the input rotor sheath 204.

[0194] In this embodiment, the input rotor baffle 205 is arranged to axially support one end of the permanent magnet, so that the position of the permanent magnet is limited in the axial direction to avoid movement caused by vibration during operation. Furthermore, the containing cavity surrounded by the input rotor magnetic ring 202, the input rotor baffle 205 and the input rotor sheath 204 is used to mount and fix the permanent magnet, which is convenient for ensuring the equal distance between multiple pairs of permanent magnets.

[0195] In some embodiments, the permanent magnet and the input rotor magnetic ring are fixedly connected by epoxy resin; and / or the input rotor sheath is fixed by gap filler and covers the outside of the permanent magnet.

[0196] In this embodiment, the strength of the structure is ensured during high-speed rotation; the carbon fiber material does not affect the distribution of the air gap magnetic field; the uniformity of the air gap is ensured, and the negative effects of air gap non-uniformity on the working performance of the coaxial magnetic gear are reduced, specifically, the peak torque is reduced, the pulsating torque amplitude, the starting response time and the iron loss are increased.

[0197] In some embodiments, the input rotor sheath is made of carbon fiber, and the surface is smoothly treated by polishing process.

[0198] In this embodiment, the carbon fiber sheath has light weight, high tensile strength, and does not generate eddy current loss during work. It has good temperature resistance, fast heat conduction, and does not conduct magnetism, and has strong dynamic balance during high-speed rotation. The permanent magnet has high compressive strength and small tensile strength, specifically ≤80MPa. In the case where the centrifugal force of the high-speed rotor becomes the main load, it is necessary to take protective measures for the permanent magnet considering that the permanent magnet is difficult to withstand the huge centrifugal force, and the material has certain processability, and the smooth surface quality ensures the uniformity of the air gap.

[0199] In some embodiments, the number of pairs of permanent magnets satisfies the following relationship: p in +p out =n s ; wherein n s is the number of magnet adjustment ring cores of the input rotor permanent magnet assembly, i.e., the number of permanent magnets, P in is the number of pairs of permanent magnets, and P out is the number of pairs of permanent magnets of the output rotor of the external shaft body.

[0200] In this embodiment, the speed ratio of the input and output rotors can be changed by changing the number of pairs of magnetic poles to achieve the required technical index.

[0201] In some embodiments, the magnetizing angle of the circumferentially adjacent permanent magnets is set to a preset angle; wherein the preset angle is 60°, and the permanent magnets are magnetized in a Halbach array manner.

[0202] In this embodiment, the air gap magnetic field of the magnetic gear is effectively improved, and the pulsating torque is reduced; the permanent magnet Halbach array can improve the basic torque performance, reduce the initial starting response time, and weaken the negative effects of non-uniform air gaps.

[0203] Embodiments of the first aspect of the application propose a magnetic gear input rotor assembly structure. In some embodiments of the application, as shown in Figure 7 , an air turbine starter housing and guider assembly structure is provided in the same air turbine starter as the magnetic gear input rotor assembly structure, and the air turbine starter housing and guider assembly structure comprises:

[0204] a housing and guider assembly 1, an input rotor assembly 2, an output rotor assembly 3, and a magnetic gear stator assembly 4;

[0205] The output rotor assembly 3, the magnetic gear stator assembly 4, and the input rotor assembly 2 are mutually sleeved and are all installed in the housing and guider assembly 1.

[0206] Among them, the inner wall of the housing and guider assembly 1 and the outer wall of the output rotor assembly 3, the output rotor assembly 3 and the magnetic gear stator assembly 4, and the magnetic gear stator assembly 4 and the input rotor assembly 2 are all spaced apart to allow gas to flow through.

[0207] Embodiments of the first aspect of the application propose a magnetic gear rotor support structure. In some embodiments of the application, as shown in Figure 8 , a magnetic gear rotor support structure is provided for installing a stator assembly structure, an output rotor assembly structure, and an input rotor assembly structure, and a housing and guider assembly structure comprises:

[0208] The shell is provided with an air inlet and a plurality of air outlets, and the inner wall of the end of the shell away from the air inlet is rotationally connected with the outer rotor structure;

[0209] The output rotor positioning sleeve 108 is installed in the shell, and the output rotor positioning sleeve 108 is sleeved on the outer wall of the outer rotor structure;

[0210] The bearing stator 103 is coaxially arranged in the shell, and the air inlet of the shell is connected with the bearing stator 103 through the turbine guide 101, and the turbine guide 101 is used for rotationally connecting the turbine;

[0211] The inner wall of the end of the shell away from the air inlet and the bearing stator 103 are respectively provided with support portions for connecting the outer rotor structure, an annular cavity for gas flow is formed between the shell and the bearing stator 103, and the inner rotor structure, the stator structure and the outer rotor structure which are sleeved from inside to outside divide the annular cavity into a plurality of flow guide cavities.

[0212] The air turbine starter shell and the guide assembly structure provided by the application have the advantages that the air turbine starter shell and the guide assembly structure can limit the radial displacement of the rotor and improve the working performance of the starter, and can safely and stably operate under the working conditions of high speed, high temperature and high pressure. The gain effects that can be achieved are as follows: due to the existence of the air outlets, the temperature of the expanded gas can be effectively reduced in the process of air flow and energy exchange, so that the working conditions are improved, and the working life and reliability of the impeller are improved. Due to the existence of the output rotor positioning sleeve 108, the radial displacement of the output rotor is limited, so that the phenomena of collision and resonance are avoided. The shell also has the effects of protecting the internal parts and preventing external objects from damaging the internal parts, and can construct an air flow channel and improve the transmission performance.

[0213] The air outlets are opened, and the temperature rise of the permanent magnet during the working process can be effectively controlled. In the air turbine starter, compressed air is used as an energy source to drive the turbine working blades to output power and torque, and after expansion and temperature reduction, the compressed air can be used as a cooling medium to cool the parts in the starter cavity, so that the parts can work under suitable temperature conditions; during the air flow process, the compressed air enters from the inlet, passes through the turbine stator grid and the turbine blade grid in turn, and drives the turbine working blades to rotate. At this time, the compressed air is expanded and cooled, a part of the air flows into the outside from the front outlet of the stator cover, and the remaining part of the air cools the magnetic speed reducer part through the inner and outer air gaps and the outer rotor outside flow channel, and then flows out through the rear air outlet of the air turbine starter.

[0214] Specifically, the end of the bearing stator 103 close to the air inlet is provided with the flow guide cone 102;

[0215] Specifically, the outer rotor structure penetrates the end of the shell away from the air inlet, and is connected with the shell through the shaft end sealing ring 107;

[0216] In some embodiments, the output rotor positioning sleeve inner cylindrical surface is provided with 8 rollers uniformly distributed in the circumferential direction, and the output rotor positioning sleeve is sleeved on the output rotor magnetism guiding ring outer cylindrical surface, which can effectively limit the radial displacement of the output rotor.

[0217] In this embodiment, when the starter is working, the rotor speed will continuously increase to the critical speed, specifically 45000 rpm. When the rotor speed exceeds the critical speed, the vibration is the most violent, and the rotor radial displacement is the largest at this time. When the rotor has a large radial displacement, the positioning sleeve can effectively limit the radial displacement by being sleeved on the cylindrical surface outside the output rotor magnetism guiding ring, thereby preventing the rotor from colliding and rubbing or avoiding harmful collision and rubbing. In an aero-engine, collision and rubbing are generally divided into harmless collision and rubbing and harmful collision and rubbing. Harmless collision and rubbing mainly includes the following two characteristics: the blade vibration caused by collision and rubbing is not large; and the blade vibration caused by collision and rubbing can gradually disappear over time. Some collision and rubbing that can cause sustained and violent vibration of the blade may induce more serious problems such as blade fracture and scrap, shaft bending, and whole machine violent vibration. Therefore, the positioning sleeve can effectively control the collision and rubbing, and even the harmful collision and rubbing, by controlling the violent vibration to convert it into harmless collision and rubbing.

[0218] The positioning sleeve can also avoid resonance to a certain extent. The structure design is comprehensively judged from the critical speed and modal identification, the modal calculation model of the inner rotor and the outer rotor is established respectively, the surface elements in contact with the rotor of each bearing are set as rigid bodies, and the calculated bearing stiffness is added in the form of a spring on the corresponding reference point. The modal calculation results are interpreted, and the first eight order vibration modes of the inner rotor and the outer rotor are similar: the natural frequencies of the third order and the third order above are much larger than the frequencies corresponding to the working speed of the rotor, so the possibility of resonance is very small.

[0219] In some embodiments, the shell includes an end cover, a first stator cover 104, and a second stator cover 105;

[0220] The flow guide cavity is located in the first stator cover 104 and the second stator cover 105, and the gas outlets are circumferentially arranged on the first stator cover 104 and the second stator cover 105 respectively, and the gas outlets are located at the end of the flow guide cavity;

[0221] The end cover includes a front end cover and a rear end cover 106 provided with a tail gas outlet.

[0222] Further, the connection and fixation between the first stator cover and the guide is screw fixation plus riveting.

[0223] In this embodiment, the segmented assembly structure is adopted for the shell, which can facilitate installation and design. The multi-layer partitioned flow guide cavities are arranged even in the first stator cover and the second stator cover, and then the gas outlets are arranged on the first stator cover and the second stator cover respectively and correspond to the end portions of the flow guide cavities. When the gas flows in the multi-layer flow guide cavities, the flow can be more stable, and the turbulent flow of the gas in the flow guide cavities caused by the outward flow of the gas can be avoided, thereby further ensuring the radial stability of the stator, the inner rotor and the outer rotor of the partitioned flow guide cavities.

[0224] In some embodiments, the flow guide cavity comprises: an inner air gap cavity located between the stator structure and the inner rotor structure;

[0225] an outer air gap cavity located between the stator structure and the outer rotor structure and having a thickness equal to that of the inner air gap cavity;

[0226] an outer flow channel cavity located between the outer rotor structure and the shell, the thickness of the outer flow channel cavity being greater than that of the inner air gap cavity, and the two end portions of the outer flow channel cavity being circumferentially corresponding and communicating with the gas outlets.

[0227] In this embodiment, the multi-layer structure of the flow guide cavity is specifically divided into the inner air gap cavity, the outer air gap cavity and the outer flow channel cavity. Since the inner rotor and the outer rotor are respectively faced in the premise of facing the same stator, and both are in a rotating state in operation, it is necessary to keep the thickness of the outer air gap cavity and the inner air gap cavity along the radial direction of the stator to be the same, and to keep the simultaneous rotation of the inner rotor and the outer rotor stable in the condition of facing the same internal air flow at the same time.

[0228] The thickness of the outer flow channel cavity is greater than that of the inner air gap cavity and the outer air gap cavity, which can accommodate more space of the annular cavity in the first stator cover and the second stator cover, so as to discharge part of the flowing air from the gas outlets on the first stator cover and the second stator cover.

[0229] In some embodiments, the end of the stator structure close to the air inlet protrudes axially from the inner rotor structure and the outer rotor structure; and / or

[0230] The front end cover and the turbine form an air inlet cavity communicating with the air inlet, and the air inlet cavity corresponds to the air inlet cavity and the outer rotor structure along the axial direction of the bearing stator 103.

[0231] In this embodiment, the end of the stator structure close to the air inlet protrudes from the inner rotor structure and the outer rotor structure, which can pre-guide the air flowing into the inner air gap cavity and the outer air gap cavity, and can further ensure the stability of the flowing air in the inner air gap cavity and the outer air gap cavity.

[0232] The air intake cavity formed by the front cover and the turbine and communicated with the air inlet is the first introduction flow channel for the air inlet to flow into the housing interior, and the air is pressurized in the flow channel to form thrust to finally drive the turbine to rotate. Therefore, the air intake cavity is arranged along the axial direction of the annular cavity corresponding to the air intake cavity and the outer rotor structure, which can avoid the high-pressure air directly contacting the inner rotor as the internal power transmission, and ensure the stability of subsequent force transmission.

[0233] In some embodiments, an axial cover is arranged at one end of the outer rotor structure close to the tail gas port, and the axial cover is arranged on the outer rotor structure, the stator structure, the inner rotor structure, and the end cover of the bearing stator 103.

[0234] The end cover is provided with a flow collecting cavity communicated with the outer air gap cavity and the outer flow channel cavity, respectively.

[0235] In this embodiment, since the outer rotor needs to finally transmit power to the coaxial output shaft, the end cover is arranged for penetratingly connecting the output shaft to ensure the output of power. On the other hand, when the air in the inner air gap cavity and the outer air gap cavity is gathered to the tail gas port, the air is collected in advance to avoid the turbulent flow of the air flowing in the internal multi-cavity, which affects the rotating parts of the device.

[0236] In some embodiments, the end cover is axially provided with a communication hole for communicating the flow collecting and the tail gas port, and the communication hole is located between the tail gas port and the outer flow channel cavity along the axial direction of the annular cavity.

[0237] In this embodiment, the flowing air collected by the inner air gap cavity and the outer air gap cavity is communicated through the communication hole. Since the outer rotor is in a rotating state during operation, the end cover with the communication hole is also in a rotating state. Further, a plurality of communication holes are equidistantly arranged along the circumference of the end cover. The rotation of the plurality of communication holes causes the intermittent communication phenomenon to occur at the same circumferential position, which avoids the gas flow discharged by the end cover from being a complete gas flow, helps the gathering between the outflow tail gas port to be more stable, avoids the gas turbulence caused by the non-corresponding communication between the plurality of cavities and hole bodies, and ensures the stable rotation of the high-speed rotating inner rotor and outer rotor.

[0238] In some embodiments, the output rotor positioning sleeve 108 is located corresponding to the air outlet on the first stator cover 104 along the radial direction of the bearing stator 103.

[0239] In the embodiment, since the high-pressure air introduced into the inside of the housing by the air inlet cavity is branched in multiple directions and is branched by the air outlet on the first stator cover, the inner air gap cavity, the outer air gap cavity and the outer flow channel cavity respectively, and the air inlet cavity corresponds to the outer rotor, the rotation of the outer rotor is prone to be unstable, therefore, the output rotor positioning sleeve is arranged corresponding to the air outlet, on the one hand, the rotation of the outer rotor can be ensured stable when the high-pressure air is branched, on the other hand, the eccentric force generated by the outer rotor when the air outlet conducts air outward can be inhibited, so that the rotation of the outer rotor is ensured stable.

[0240] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0241] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A magnetic gear rotor support structure, characterized by, The rotor comprises an output rotor assembly structure and an input rotor assembly structure arranged in the housing and the guide assembly structure of the magnetic gear, the output rotor assembly structure is axially provided with a hollow part for sleeving the input rotor assembly structure; The first annular cavity is formed between the input rotor assembly structure and the output rotor assembly structure, and the radial width of the first annular cavity is equal along the circumference of the input rotor assembly structure; The output rotor assembly structure is circumferentially provided with a connecting part at one end of the input rotor assembly structure, and the output shaft is coaxially arranged through the connecting part; The second annular cavity is formed between the output shaft and the input rotor assembly structure, and the support mechanism is arranged in the second annular cavity along the axis of the output shaft; One end of the first annular cavity is connected with the hollow part, and the other end is connected with the inside of the housing and the guide assembly structure; The stator assembly structure is arranged in the first annular cavity of the housing and the guide assembly structure, and the connection between the stator assembly structure and the housing and the guide assembly structure is located in the communication between the first annular cavity and the inside of the housing and the guide assembly structure; The housing and the guide assembly structure comprise a clamping part, the clamping part is circumferentially assembled on the output shaft, and the clamping part is located on the side of the connecting part away from the output rotor assembly structure; The assembly part is circumferentially assembled on the output shaft, and the clamping part is located on the side of the connecting part away from the output rotor assembly structure.

2. The magnetic gear rotor support structure of claim 1, wherein, The support mechanism comprises: The support stator assembly structure is connected with the housing and the guide assembly structure at one end away from the connecting part, and the other end is arranged in the communication between the first annular cavity and the hollow part; The second support assembly is arranged at least two, and is used for connecting the support stator assembly structure and the input rotor assembly structure; The third support assembly is used for connecting the support stator assembly structure and the output shaft, and is axially located between adjacent second support assemblies along the output shaft.

3. The magnetic gear rotor support structure of claim 2, wherein, Each of the first support assembly and the second support assembly comprises at least one angular contact bearing, and the third support assembly comprises a needle bearing.

4. The magnetic gear rotor support structure of claim 3, wherein, The power part is circumferentially arranged at one end of the output rotor assembly structure axially protruding from the output rotor assembly structure, and the power part is located on the side of the connecting part away from the output rotor assembly structure.

5. The magnetic gear rotor support structure of claim 4, wherein, The radial distance between the center of the rolling body of the needle bearing, the angular contact bearing of the first support assembly and the angular contact bearing of the second support assembly and the output shaft axis is not equal.

6. The magnetic gear rotor support structure of claim 5, wherein, The projection of the clamping part, the input rotor assembly structure, the output rotor assembly structure, the stator assembly structure along the output shaft axis is located on the connecting part; and The projection of the third support assembly and the support stator assembly structure along the output shaft axis is located on the output shaft.

7. An air turbine starter characterized by, The rotor comprises an output rotor assembly structure and an input rotor assembly structure arranged in the housing and the guide assembly structure of the magnetic gear, the output rotor assembly structure is axially provided with a hollow part for sleeving the input rotor assembly structure; The magnetic gear uses the rotor support structure according to any one of claims 1-6.

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