A motor, a rotor system and a micro gas turbine generator set

Abstract

The present invention provides an electric motor, a rotor system and a micro gas turbine generator set. The electric motor is sleeved on a rotating shaft. The electric motor includes a coil, a stator and a housing. Among them, the coil is wound axially inside the stator, and both ends of the coil extend out of the stator. The stator is sleeved with the housing. End covers are provided at both ends of the housing. The rotating shaft penetrates through the end covers and the stator to be installed in the electric motor. An air bearing is sleeved on the rotating shaft, and the air bearing is arranged between the end cover and the rotating shaft. The air bearing is a throttle orifice edge type air bearing. In the present invention, the throttle orifice is located at a position close to the edge of the bearing, which can reduce the axial length of the bearing sealing part. At the same time, through the winding design of the motor coil, the bearing can be stuffed under the motor coil, and the length and volume of the stator can be reduced as needed, and the length and size of the gas path in the stator can be reduced, thereby reducing the axial length of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor systems, and particularly to an electric motor, a rotor system and a micro gas turbine generator set. Background Art

[0002] A micro gas turbine is a newly developed small thermal engine with a single-unit power range of 25 - 300 kW. Its basic technical feature is the adoption of a radial flow turbomachine and a regenerative cycle. A micro gas turbine generator set generally includes a generator and a micro gas turbine coaxially installed. Specifically, the micro gas turbine mainly includes three major components: a compressor, a combustion chamber and a turbine. After air enters the compressor, it is compressed into high-temperature and high-pressure air, and then supplied to the combustion chamber to be mixed with fuel for combustion. The high-temperature and high-pressure gas generated thereby expands and does work in the turbine, driving the turbine to rotate, and the turbine then drives the generator to generate electricity. When the rotational speed of the gas turbine rotor system exceeds 40,000 RPM (revolutions per minute), ordinary mechanical bearings can no longer meet the requirements of the operating speed. Therefore, the prior art proposes to use non-contact bearings to replace the original mechanical bearings, among which the most representative one is the air bearing.

[0003] However, the air bearing in the prior art has the following defects: when the static pressure of the existing hydrostatic air bearing is closed, it cannot work and needs to keep the high-pressure gas source open all the time. Moreover, a relatively large supply pressure is required to make the air film in the bearing clearance generate relatively large stiffness and damping to maintain the stability of the rotor motion state. Therefore, more throttle holes and larger apertures are needed, and the power consumption of the hydrostatic gas bearing is also relatively large when it always maintains the static pressure supply state.

[0004] Meanwhile, when the static pressure is closed, the throttle holes will hinder the generation of the bearing air film. When the static pressure supply is turned off or the supply pipe is directly unplugged, the throttle hole part is directly connected to the atmosphere, and it can be considered that the pressure here is always equivalent to the atmospheric pressure. If the pressure formed by the dynamic pressure air film here is higher than the atmospheric pressure, at the throttle hole, the gas will flow from the inside of the bearing to the outside through the throttle hole; if the pressure formed by the dynamic pressure air film here is lower than the atmospheric pressure, at the throttle hole, the outside gas will enter the bearing from the throttle hole. Therefore, when the static pressure supply is turned off or the static pressure supply pipe is directly unplugged, a sudden change in the air film pressure will occur at the throttle hole part, the air film is discontinuous, and the gas is more inclined to release the pressure through the throttle hole part rather than being squeezed in the bearing clearance. As a result, the bearing load capacity is reduced, the position of the rotor in the bearing drops, and the lower edge of the rotor will be closer to the inner edge of the bearing, making it easy to collide.

[0005] Moreover, additional disturbing forces will be generated at the throttle orifice due to the inflow and outflow of gas, interfering with the stability of the air film inside the bearing and making it prone to bearing instability, which may lead to collisions between the rotor and the bearing, causing the rotor speed to decrease or even directly shut down. Contact between the high-speed moving rotor and the bearing is very dangerous and can cause the bearing and rotor to be scrapped on the spot.

[0006] In addition, when the bearing is very close to the compressor inlet, the thickness of the bearing will block a part of the compressor inlet space, hindering the compressor from sucking air and reducing the efficiency of the compressor. Summary of the Invention

[0007] In order to solve the above technical problems, the object of the present invention is to provide an electric motor, a rotor system and a micro gas turbine generator set.

[0008] The technical solution of the present invention is as follows:

[0009] According to one aspect of the present invention, there is provided an electric motor sleeved on a rotating shaft. The electric motor includes a coil, a stator and a housing.

[0010] Wherein, the coil is wound axially inside the stator, and both ends of the coil extend out of the stator. The stator is sleeved with the housing, and end caps are provided at both ends of the housing. The rotating shaft passes through the end caps and the stator to be installed inside the electric motor. An air bearing is sleeved on the rotating shaft, and the air bearing is arranged between the end cap and the rotating shaft.

[0011] The air bearing includes a cylindrical body. A plurality of concentric annular damping seats are integrally formed on the outer periphery of the end of the body. Dampers are radially installed on the damping seats, and mounting grooves matching the dampers are radially provided on the damping seats. Throttle orifices penetrating the body in the radial direction are provided between the damping seats. The part of the body provided with the damping seats and the throttle orifices is the static pressure part of the air bearing, and the part of the body not provided with the damping seats and the throttle orifices is the dynamic pressure part of the air bearing.

[0012] Further, a plurality of concentric annular damping seats are integrally formed on the outer periphery of one end of the body.

[0013] The static pressure part of the air bearing is arranged between the end cap and the rotating shaft, and the static pressure part of the air bearing is arranged at one end of the end cap close to the side. The dynamic pressure part of the air bearing is arranged between the coil extending out of both ends of the stator and the rotating shaft.

[0014] Further, a plurality of concentric annular damping seats are integrally formed on the outer peripheries of both ends of the body, and throttle orifices penetrating the body in the radial direction are respectively provided between the damping seats at both ends.

[0015] Both the static pressure part and the dynamic pressure part of the air bearing are arranged between the end cap and the rotating shaft, and the static pressure part of the air bearing is arranged at both ends of the end cap close to the side.

[0016] Furthermore, the damping seat and the throttle hole at one end of the body are symmetrically arranged with respect to the damping seat and the throttle hole at the other end.

[0017] Furthermore, the number of damping seats at one end of the body is set to 1 - 3, the throttle holes are distributed in a row along the circumference of the body, and the corresponding throttle holes are set to 1 - 3 rows.

[0018] Furthermore, the number of throttle holes is 6 - 25 per row, and the diameter of the throttle hole is less than 500um.

[0019] Furthermore, the number of damping seats at one end of the body is set to 2, and the corresponding throttle holes are set to 1 row;

[0020] Or, the number of damping seats at one end of the body is set to 3, the corresponding throttle holes are set to 2 rows, and the damping seats and the throttle holes are arranged at intervals;

[0021] Or, the number of damping seats at one end of the body is set to 2, and the corresponding throttle holes are set to 2 rows.

[0022] Furthermore, the end face of one end of the body coincides with the end face of the outermost damping seat at this end.

[0023] Furthermore, the throttle hole is a stepped hole or a variable - diameter hole with a funnel - shaped or conical cross - section.

[0024] Furthermore, the damping seats have the same diameter, and the axial widths of the damping seats are equal.

[0025] Furthermore, a thrust bearing is arranged outside the end cover on one side of the motor, and the thrust bearing is a foil - type or integral thrust bearing.

[0026] Furthermore, the motor is provided with channels for supplying and exhausting air to and from the air bearing, and the channels for supplying and exhausting air to and from the air bearing are arranged on the end cover or the housing;

[0027] The stator is in a cylindrical shape, and a through - hole for installing the rotating shaft is formed at the central position of the cylinder. A plurality of outer wire grooves extending along the axial direction of the cylinder and evenly distributed along the circumferential direction of the cylinder are formed on the outer diameter side of the stator, and a plurality of inner wire grooves extending along the axial direction of the cylinder and evenly distributed along the circumferential direction of the cylinder are formed on the inner diameter side of the stator. The coil is wound along the axial direction of the cylinder in the outer wire grooves and the inner wire grooves.

[0028] According to another aspect of the present invention, a rotor system is provided, which includes a rotating shaft, a motor, a compressor and a turbine sequentially arranged on the rotating shaft. The rotating shaft has a first shaft section and a second shaft section. The diameter of the first shaft section is larger than that of the second shaft section. A stepped surface is formed at the transition between the first shaft section and the second shaft section. The motor is arranged on the first shaft section, and the compressor and the turbine are arranged on the second shaft section. One end of the compressor abuts against the stepped surface;

[0029] The motor is the above-mentioned motor, and the air bearings are arranged at both ends of the motor.

[0030] Furthermore, a reduced-diameter section extends from the air bearing body near the compressor end in the motor towards the outside of the end cover;

[0031] The reduced-diameter section gradually reduces in diameter outwards towards one end or the reduced-diameter section gradually reduces in diameter inwards towards one end;

[0032] The reduced-diameter section extends to the stepped surface of the rotating shaft;

[0033] The thickness of the reduced-diameter section is less than 4 mm.

[0034] According to another aspect of the present invention, a micro gas turbine generator set is provided, which includes the above-mentioned rotor system, a motor casing, a gas turbine casing and a combustion chamber;

[0035] The motor casing covers the outer periphery of the motor. The gas turbine casing covers the outer peripheries of the compressor and the turbine and is connected to the motor casing. The combustion chamber is connected to the gas turbine casing, and the air inlet of the combustion chamber is connected to the exhaust port of the compressor, and the exhaust port of the combustion chamber is connected to the air inlet of the turbine.

[0036] Advantages of the present invention:

[0037] 1. In the present invention, the throttle hole is located near the edge of the bearing. Therefore, the axial length of the bearing seal part can be reduced. At the same time, through the winding design of the motor coil, the bearing can be stuffed under the motor coil, and the length and volume of the stator can be reduced as needed, and the length and size of the air path in the stator can be reduced, thereby reducing the axial length of the rotor.

[0038] 2. In the present invention, the throttle hole is located near the edge of the bearing, and it is a hybrid air bearing with asymmetric distribution of throttle holes. Since the throttle hole is very biased towards one side of the bearing, the side without air injection requirement is a very thin structure. When the diameter of a rotating shaft is already determined, its length is an important indicator to determine whether it is a slender shaft and has a crucial impact on the critical frequency. Therefore, stuffing the thinner part of the air bearing into the outgoing wire sides on both sides of the motor coil can greatly reduce the space occupied by the end face, and can save about the length of the entire magnetic core of the motor for the rotor, which has a decisive effect on shortening the rotor and reducing the critical frequency.

[0039] 3. In the present invention, by adjusting the structure of the bearing in a reduced-diameter manner, the fulcrum of the damper installation position of the bearing is set at one end as far away from the compressor inlet as possible, and the stator also retracts accordingly. The thickness of the bearing outside the fulcrum of the damper installation position is reduced, and only the dynamic pressure air bearing functions. In this way, it can be as thin as possible while ensuring that the bearing has sufficient supporting force, avoiding blocking the intake air.

[0040] 4. The position of the throttle hole of the air bearing of the present invention is close to one side or both sides of the bearing. By reducing the diameter and the number of throttle holes, the air bearing can still maintain good static pressure load through a very small number of small-diameter throttle holes.

[0041] 5. For the hybrid dynamic and static pressure air bearing of the present invention, it only needs to turn on the static pressure to suspend the rotor when the rotor is stationary and can smoothly make the rotor reach the state of dynamic and static pressure switching. Or during the process of the rotor decelerating, when the dynamic pressure state cannot maintain the stability of the rotor, turn on the static pressure supply to make the rotor smoothly decelerate until it stops. It does not need to keep the static pressure supply on all the time, which can reduce the flow rate and power consumption of the static pressure supply.

[0042] 6. The edge-by-side design of the throttle hole of the present invention can minimize the axial length of the bearing affected by the throttle hole leakage, so that the part that can generate a stable air film is as long as possible, maintaining the stability of the rotor in the pure dynamic pressure state and reducing the influence of the throttle hole on the dynamic pressure air film.

[0043] 7. The present invention sets the throttle holes at the edge position of the air bearing. Different from the symmetric design on both sides of the ordinary dynamic pressure air bearing and the ordinary static pressure air bearing, the throttle holes are asymmetrically distributed, which is equivalent to connecting the dynamic pressure bearing and the static pressure bearing in series through structural design. By changing the static pressure supply, different bearing capacities, different stiffnesses and dampings can be generated in the dynamic pressure part and the static pressure part. Coupled with the rotor dynamics design, different stable effects can be generated, helping to maintain the stability of the rotor and helping the rotor pass through the resonance mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of an embodiment of a motor including an air bearing.

[0045] Figure 2 It is a schematic structural diagram of an embodiment of the throttle hole of the air bearing.

[0046] Figure 3 It is a schematic structural diagram of another embodiment of the throttle hole of the air bearing.

[0047] Figure 4 It is a schematic structural diagram of still another embodiment of the throttle hole of the air bearing.

[0048] Figure 5 Schematic structural diagram of another embodiment of the throttle orifice of the air bearing.

[0049] Figure 6 Schematic structural diagram of another embodiment of the motor including the air bearing.

[0050] Figure 7 Schematic structural diagram of the rotor system including the air bearing.

[0051] Figure 8 Schematic structural diagram of one embodiment of the reduced diameter section of the air bearing

[0052] Figure 9 Schematic structural diagram of another embodiment of the reduced diameter section of the air bearing. Detailed implementation manners

[0053] For a better understanding of the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments and the accompanying drawings of the specification.

[0054] According to one aspect of the present invention, an embodiment of the present invention provides a motor including an air bearing.

[0055] As Figure 1 shown, an embodiment provided for the motor includes a coil 31, a stator 32 and a housing 33. The coil 31 is wound axially inside the stator 32. Both ends of the coil 31 extend out of the stator 32. A housing 33 is sleeved outside the stator 32. End caps 34 are provided at both ends of the housing 33. A rotating shaft 2 passes through the end caps 34 and the stator 32 to be installed in the motor 3. An air bearing 1 is sleeved on the rotating shaft 2, and the air bearing 1 is arranged between the end cap 34 and the rotating shaft 2.

[0056] In the present invention, the air bearing 1 is a throttle orifice side air bearing. As Figure 2 shown, an embodiment provided for the throttle orifice includes a cylindrical body 11. A plurality of concentric ring-shaped damping seats 12 are integrally formed on the outer periphery of one end of the body 11. A damper 14 is radially installed on the damping seat 12. An installation groove matching the damper 14 is radially provided on the damping seat 12. A throttle orifice 13 penetrating the body 11 in the radial direction is provided between the damping seats 12. The part of the body 11 provided with the damping seat 12 and the throttle orifice 13 is the static pressure part of the air bearing, and the part of the body 11 not provided with the damping seat 12 and the throttle orifice 13 is the dynamic pressure part of the air bearing.

[0057] Preferably, the damping seat 12 is provided with 1 to 3, the throttle orifices 13 are circumferentially distributed in a row along the body 11, and the throttle orifices 13 are provided with 1 to 3 rows.

[0058] Specifically, the number of the throttle orifices 13 is 6 to 25 per row, and the diameter of the throttle orifices 13 is less than 500 um.

[0059] Preferably, the end face of one end of the body 11 coincides with the end face of the outermost damping seat 12 at this end.

[0060] As Figure 3 shown, another embodiment of the throttle hole setting, wherein a plurality of concentric annular damping seats 12 are integrally formed on the outer peripheries of both ends of the air bearing body 11, and through throttle holes 13 are respectively arranged along the radial direction of the body 11 between the damping seats 12 at both ends.

[0061] Preferably, the damping seat 12 and the throttle hole 13 at one end of the air bearing body 11 are symmetrically arranged with respect to the damping seat 12 and the throttle hole 13 at the other end.

[0062] Preferably, there are two damping seats 12 at one end of the air bearing body 11, and the throttle holes 13 are arranged in a row.

[0063] As Figure 4 shown, still another embodiment of the throttle hole setting, there are three damping seats 12 at one end of the air bearing body 11, there are two throttle holes 13, and the damping seats 12 and the throttle holes 13 are arranged at intervals.

[0064] As Figure 5 shown, still another embodiment of the throttle hole setting, wherein there are two damping seats 12 at one end of the air bearing body 11, and there are two throttle holes 13.

[0065] Preferably, the throttle hole 13 is a stepped hole or a stepped-diameter hole with a funnel-shaped or conical cross-section.

[0066] Preferably, the damping seats 12 are of equal diameter, and the axial widths of the damping seats 12 are equal.

[0067] For the air bearing structure provided by the above embodiments, for a rotor with a diameter of less than 50 mm, the bearing length is less than 50 mm, the air bearing can stably operate within the air film gap range of 10 - 150 μm, and the supply pressure can be selected as the absolute pressure of 1.1 - 8 times the atmospheric pressure, having a relatively large adaptable working range.

[0068] For the motor provided by the embodiments of the present invention, when the throttle hole 13 is set as the embodiment shown in Figure 3 shown, both the static pressure part and the dynamic pressure part of the air bearing are arranged between the end cover 34 and the rotating shaft 2, and the static pressure part of the air bearing is arranged at both ends of the end cover 34 along the edge.

[0069] When the throttle hole 13 is set as the embodiments shown in Figure 2 、 4 、5, the static pressure part of the air bearing is arranged between the end cover 34 and the rotating shaft 2, the static pressure part of the air bearing is arranged at one end of the end cover 34 along the edge, and the dynamic pressure part of the air bearing is arranged between the coil 31 extending from both ends of the stator 32 and the rotating shaft 2.

[0070] During operation, the static pressure part of the air bearing cooperates with the end cover 34 and the rotating shaft 2 , and the dynamic pressure part of the air bearing cooperates only with the rotating shaft 2 .

[0071] like Figure 6 As shown in FIG. 1 , another embodiment of the motor arrangement is shown, wherein the air bearing 1 at one end of the motor 3 is arranged as follows: Figure 3 The air bearing shown in FIG. 1 is configured as follows: Figure 5 Air bearing shown.

[0072] Further, the air bearings 1 at both ends of the motor 3 can be configured as follows: Figures 2 - 5 Any of the air bearings shown can be used to form a variety of air bearing settings.

[0073] Preferably, a thrust bearing may be provided outside the end cover 34 on one side of the motor 3, and the thrust bearing may be a foil type or an integrated thrust bearing.

[0074] Preferably, the motor 3 is also provided with a channel for supplying and exhausting air to the air bearing 1 , which can be arranged on the end cover 34 , the housing 33 or other positions that do not affect the function of the motor 3 .

[0075] Preferably, the stator 32 of the motor 3 is cylindrical, and a through hole for installing the rotating shaft 2 is formed at the center position of the cylinder, and a plurality of outer wire grooves extending along the axial direction of the cylinder and uniformly distributed along the circumference of the cylinder are formed on the outer diameter side of the stator 32, and a plurality of inner wire grooves extending along the axial direction of the cylinder and uniformly distributed along the circumference of the cylinder are formed on the inner diameter side of the stator 32, and the coil 31 is wound in the outer wire grooves and the inner wire grooves along the axial direction of the cylinder.

[0076] The present invention also provides a rotor system including an air bearing, such as Figure 7 As shown, the rotating shaft 2 includes a first shaft section 21 and a second shaft section 22. The diameter of the first shaft section 21 is larger than the diameter of the second shaft section 22. A step surface is formed at the transition between the first shaft section 21 and the second shaft section 22. The motor 3, the compressor 4, and the turbine 5 are sequentially arranged on the rotating shaft 2. The motor 3 is arranged on the first shaft section 21 through the air bearing 1. The compressor 4 and the turbine 5 are arranged on the second shaft section 22. One end of the compressor 4 abuts against the step surface. The air bearings 1 are arranged at both ends of the motor 3.

[0077] Preferably, the static pressure part of the air bearing is only arranged between the end cover 34 and the rotating shaft 2, the static pressure part of the air bearing is arranged at one end or both ends of the end cover 34, and the dynamic pressure part of the air bearing is arranged between the end cover 34 and the rotating shaft 2 or between the coil 31 extending from both ends of the stator 32 and the rotating shaft 2.

[0078] Preferably, the static pressure part of the air bearing cooperates with the end cover 34 and the rotating shaft 2, and the dynamic pressure part of the air bearing only cooperates with the rotating shaft 2.

[0079] Preferably, the air bearing body 11 near one end of the compressor 4 in the motor 3 extends outward beyond the outer end cover 34 with a reduced-diameter section. Figures 8 - 9 For Figure 7 the partial enlarged view of part A in the view, as Figure 8 shown, is an embodiment of the reduced-diameter section, and the reduced-diameter section gradually reduces in diameter outwardly towards one end. As Figure 9 shown, is another embodiment of the reduced-diameter section, and the reduced-diameter section gradually reduces in diameter inwardly towards one end.

[0080] Preferably, the reduced-diameter section extends to the step surface of the rotating shaft 2.

[0081] Preferably, the thickness of the reduced-diameter section is less than 4 mm.

[0082] The embodiment of the present invention also provides a micro gas turbine generator set using the above rotor system. The generator set includes: the above rotor system, the motor casing 6, the gas turbine casing 7, and the combustion chamber 8. The motor casing 6 covers the outer periphery of the motor 3, the gas turbine casing 7 covers the outer peripheries of the compressor 4 and the turbine 5 and is connected to the motor casing 6. The combustion chamber 8 is connected to the gas turbine casing 7, and the air inlet of the combustion chamber 8 is connected to the exhaust port of the compressor 4, and the exhaust port of the combustion chamber 8 is connected to the air inlet of the turbine 5.

[0083] Preferably, a diffuser is provided between the exhaust port of the compressor 4 and the air inlet of the combustion chamber 8 to further increase the pressure of the high-temperature and high-pressure gas entering the turbine 5 for work.

[0084] In the gas turbine generator set of this embodiment, the bearing is arranged in the motor casing 6. In this way, it is only necessary to ensure the machining accuracy of the part in the casing for arranging the bearing stator. During assembly, the part in the casing for connecting the bearing stator can be completed through one-time clamping and machining. It can be seen that this embodiment reduces the machining accuracy and assembly accuracy of the gas turbine generator set, reduces the cost, and is suitable for engineering batch production.

[0085] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are similar in function to those disclosed in the present application (but not limited to).

Claims

1. A motor, the motor is sleeved on a rotating shaft, characterized in that, The motor includes a coil, a stator, and a housing; Among them, the coil is wound axially inside the stator, both ends of the coil extend out of the stator, the housing is sleeved outside the stator, end caps are provided at both ends of the housing, the rotating shaft penetrates the end caps and the stator to be installed inside the motor, an air bearing is sleeved on the rotating shaft, and the air bearing is arranged between the end cap and the rotating shaft; The air bearing includes a cylindrical body, and a plurality of concentric annular damping seats are integrally formed on the outer periphery of the end of the body. A damper is radially installed on the damping seat, an installation groove matching the damper is radially provided on the damping seat, a throttling hole penetrating the body in the radial direction is provided between the damping seats, and the part of the body provided with the damping seat and the throttling hole is the static pressure part of the air bearing, and the part of the body not provided with the damping seat and the throttling hole is the dynamic pressure part of the air bearing; A plurality of concentric annular damping seats are integrally formed on the outer periphery of one end of the body; The static pressure part of the air bearing is arranged between the end cap and the rotating shaft, the static pressure part of the air bearing is arranged at one end of the end cap along the edge, and the dynamic pressure part of the air bearing is arranged between the coil extending out of both ends of the stator and the rotating shaft.

2. The electric machine according to any one of claim 1, characterized in that The number of damping seats at one end of the body is set to 1 to 3, the throttling holes are distributed in a row along the circumferential direction of the body, and the corresponding throttling holes are set to 1 to 3 rows.

3. The motor according to claim 2, characterized in that, The number of throttling holes is 6 to 25 per row, and the diameter of the throttling holes is less than 500 μm.

4. The motor according to claim 2, wherein The number of damping seats at one end of the body is set to 2, and the corresponding throttling holes are set to 1 row; Or, the number of damping seats at one end of the body is set to 3, the corresponding throttling holes are set to 2 rows, and the damping seats and the throttling holes are arranged at intervals; Or, the number of damping seats at one end of the body is set to 2, and the corresponding throttling holes are set to 2 rows.

5. The motor according to claim 1, characterized in that The end face of one end of the body coincides with the end face of the outermost damping seat at this end.

6. The motor according to claim 1, characterized in that, The throttling hole is a stepped hole or a variable-diameter hole with a funnel-shaped or conical cross-section.

7. The motor according to claim 1, characterized in that, The damping seats are of equal diameter, and the axial widths of the damping seats are equal.

8. The motor according to claim 1, characterized in that, A thrust bearing is arranged outside the end cap on one side of the motor, and the thrust bearing is a foil-type or integral thrust bearing.

9. The motor according to claim 1, characterized in that, A channel for supplying and exhausting air to the air bearing is provided on the motor, and the channel for supplying and exhausting air to the air bearing is arranged on the end cap or the housing; The stator is in a cylindrical shape, and a through hole for installing the rotating shaft is formed at the central position of the cylinder. A plurality of outer wire grooves extending along the axial direction of the cylinder and evenly distributed along the circumferential direction of the cylinder are formed on the outer diameter side of the stator, and a plurality of inner wire grooves extending along the axial direction of the cylinder and evenly distributed along the circumferential direction of the cylinder are formed on the inner diameter side of the stator. The coil is wound axially in the outer wire grooves and the inner wire grooves.

10. A rotor system, characterized in that, It includes a rotating shaft, a motor, a compressor, and a turbine sequentially arranged on the rotating shaft. The rotating shaft has a first shaft section and a second shaft section. The diameter of the first shaft section is larger than that of the second shaft section. A stepped surface is formed at the transition between the first shaft section and the second shaft section. The motor is arranged on the first shaft section, the compressor and the turbine are arranged on the second shaft section, and one end of the compressor abuts against the stepped surface; The motor is the motor according to any one of claims 1 to 9, and the air bearings are arranged at both ends of the motor.

11. The rotor system according to claim 10, characterized in that, The air bearing body near the compressor end inside the motor extends towards the outside of the end cover with a reduced-diameter section; The reduced-diameter section gradually reduces in diameter outwards towards one end or the reduced-diameter section gradually reduces in diameter inwards towards one end; The reduced-diameter section extends to the step surface of the rotating shaft; The thickness of the reduced-diameter section is less than 4 mm.

12. A micro gas turbine power generation unit, characterized in that, Comprising the rotor system, motor casing, gas turbine casing and combustion chamber according to claim 10 or 11; The motor casing covers the outer periphery of the motor, the gas turbine casing covers the outer periphery of the compressor and the turbine, and is connected to the motor casing, the combustion chamber is connected to the gas turbine casing, and the air inlet of the combustion chamber is connected to the exhaust outlet of the compressor, and the exhaust outlet of the combustion chamber is connected to the air inlet of the turbine.

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