A high-speed stepping motor dedicated to a satellite

Abstract

The utility model discloses a kind of high-speed stepping motor special for satellite, belong to the technical field of stepping motor, including motor shell, motor shell rear end is fixedly connected with motor rear cover by bolt, motor shell front end is fixedly connected with motor front cover by bolt, motor front cover front end is equipped with multiple heat dissipation ports, motor shell inner chamber is fixedly connected with internal structure, internal structure outside is fixedly connected with rotor structure, it is by increasing the way of pole pair number to promote magnetic field intensity, it is convenient to provide sufficient power for the high-speed operation of motor;Two groups of heat radiation components can be set to quickly export the heat generated when motor high-speed rotation;It can also provide rigid support for the rotating shaft, ensuring the stability when motor high-speed operation;Through magnetic separation component, the heat dissipation efficiency of stepping motor and the stability under high-speed operation state can be further improved, the practicability of stepping motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and more specifically, to a high-speed stepper motor for satellite applications. Background Technology

[0002] A satellite is a natural celestial body that orbits a planet in a closed orbit. Artificial satellites are also generally referred to as satellites. In the vast universe, satellites serve as an important platform for humankind to explore space, conduct space science research and applications. Their operating environment is extremely unique and harsh. Stepper motors, with their high-precision positioning, good control performance and the ability to achieve precise displacement control without feedback, are widely used in key mechanisms of satellites such as antenna pointing adjustment, solar panel drive, attitude control system, and camera focusing.

[0003] In satellite-specific stepper motors, heat dissipation is a major bottleneck restricting their high-speed and continuous operation. When a stepper motor operates at high speed, the internal stator windings, rotor and other components generate a lot of heat due to electromagnetic losses and mechanical friction. If this heat cannot be dissipated in time, it will cause the internal temperature of the motor to rise sharply, which will not only reduce the motor's working efficiency and service life, but also cause motor overload, burnout and other faults in severe cases, affecting the stable operation of the entire equipment system.

[0004] Meanwhile, the stability of stepper motors during high-speed operation is also crucial. When the rotor structure of a traditional motor rotates at high speed, it is prone to displacement and vibration due to factors such as centrifugal force. This not only aggravates the wear of components and affects the control accuracy of the motor, but may also generate additional noise due to vibration, and even lead to damage to the overall structure of the motor. In addition, the magnetic field coupling between rotors may become unstable during high-speed operation, further affecting the operational stability and reliability of the motor.

[0005] Therefore, a high-speed stepper motor specifically designed for satellites is proposed to address the aforementioned issues. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] In view of the problems existing in the prior art, the purpose of this utility model is to provide a high-speed stepper motor for satellites, which can achieve stable high-speed operation.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A high-speed stepper motor for satellite applications includes a motor housing, a rear cover of which is bolted to the rear end, and a front cover of which is bolted to the front end. The front cover has multiple heat dissipation vents. An internal structure is fixedly connected to the inner cavity of the motor housing, and a rotor structure is fixedly connected to the outside of the internal structure. The internal structure includes a shaft, and two bearings are fixedly connected to the outer surface of the shaft. The bearing located at the front is fixedly mounted on the inner surface of the front cover, and the bearing located at the rear is fixedly mounted on the inner surface of the rear cover. Two heat dissipation components are fixedly connected to the outer surface of the shaft.

[0011] Furthermore, the heat dissipation assembly includes a positioning ring, at least one bearing II is fixedly connected to the inner cavity of the positioning ring, a connecting ring is fixedly connected to the inner surface of the bearing II, a plurality of connecting rods are fixedly connected to the inner surface of the connecting ring, and a bushing ring is fixedly connected to the ends of the plurality of connecting rods away from the connecting ring. A fan blade is fixedly connected to the outer surface of the bushing ring. The fan blade adopts a streamlined design, which can form a directional airflow inside when the motor rotates, and guide the heat generated inside the motor to the heat dissipation port of the front cover of the motor.

[0012] Furthermore, the rotor structure includes a stator ring, two N-pole rotors, and two S-pole rotors. The outer surface of the stator ring is fixedly installed in the inner cavity of the motor housing. The two N-pole rotors are fixedly installed on the outer surface of the shaft, and the two S-pole rotors are fixedly installed on the outer surface of the shaft. A magnetic isolation component is provided between the N-pole rotors and the S-pole rotors. The N-pole rotors and S-pole rotors are arranged alternately. By increasing the number of magnetic pole pairs, the magnetic field strength is increased, providing a power basis for high-speed operation.

[0013] Furthermore, the magnetic isolation assembly includes a heat-conducting ring. Multiple receiving slots are formed on the outer surface of the heat-conducting ring. Two slide rails are fixedly connected to the inner cavities of each receiving slot. Slider blocks are slidably connected to the outer surfaces of the two slide rails. A magnetic resistance adjustment plate is fixedly connected to one end of each slider that is close to the other. Multiple hollow tubes are fixedly connected to the bottom wall of the inner cavity of each receiving slot. Telescopic rods are slidably connected to the inner cavities of the hollow tubes. The upper end of the telescopic rod is fixedly connected to the lower end of the magnetic resistance adjustment plate. A spring is sleeved on the outer surface of the telescopic rod. The heat-conducting ring can quickly absorb heat from the rotor gap and conduct it to the outside. The magnetic resistance adjustment plate can change position under the action of centrifugal force when the motor rotates, thereby dynamically adjusting the magnetic resistance between the rotors.

[0014] Furthermore, the inner surface of the heat-conducting ring is fixedly connected to the outer surface of the rotating shaft, and the heat-conducting ring is located between the N-pole rotor and the S-pole rotor.

[0015] Furthermore, the inner surface of the bushing ring is fixedly connected to the outer surface of the rotating shaft, and the outer surface of the positioning ring is fixedly connected to the inner cavity of the motor housing.

[0016] 3. Beneficial effects

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] (1) This solution uses the alternating arrangement of N-pole rotors and S-pole rotors in the rotor structure to increase the magnetic field strength by increasing the number of magnetic pole pairs, which facilitates the provision of sufficient power for the high-speed operation of the motor and can effectively break through the speed limit of the traditional single-pole design. By setting two sets of heat dissipation components, the heat generated by electromagnetic loss and mechanical friction of components such as stator windings and rotors can be quickly dissipated. At the same time, the heat dissipation components can provide rigid support for the motor shaft, which greatly reduces the offset and vibration caused by centrifugal force when the traditional motor rotor rotates at high speed, reduces component wear, ensures the stability of the motor when it runs at high speed, and improves the practicality of the stepper motor.

[0019] (2) This solution can quickly absorb the heat in the gap between the N-pole rotor and the S-pole rotor through the magnetic shielding component and conduct it to the area accessible by the external airflow. This effectively makes up for the insufficiency of simple wind power heat dissipation in covering the heat in the gap and can further improve the heat dissipation efficiency. At the same time, under the action of centrifugal force, the magnetic resistance between the rotors can be adaptively adjusted according to the different motor speeds. When the motor is running at low speed, the torque can be effectively increased by enhancing the magnetic field coupling. When the motor is running at high speed, the instability of the magnetic field coupling can be effectively weakened, reducing the vibration and noise caused by magnetic field fluctuations, and ensuring the stability and reliability of the motor at high speed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the heat dissipation component of this utility model;

[0023] Figure 4 This is a schematic diagram of the rotor structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the magnetic shielding component of this utility model;

[0025] Figure 6 This utility model Figure 5 Enlarged diagram of point A in the middle.

[0026] Explanation of the labels in the diagram:

[0027] 1. Motor housing; 2. Motor rear cover; 3. Motor front cover; 4. Heat dissipation vent; 5. Internal structure; 51. Shaft; 52. Bearing 1; 53. Heat dissipation assembly; 531. Positioning ring; 532. Bearing 2; 533. Connecting ring; 534. Connecting rod; 535. Shaft sleeve ring; 536. Fan blade; 6. Rotor structure; 61. Stator ring; 62. N-pole rotor; 63. S-pole rotor; 64. Magnetic shielding assembly; 641. Heat-conducting ring; 642. Storage groove; 643. Slide rail; 644. Slider; 645. Magnetic resistance adjustment plate; 646. Hollow tube; 647. Telescopic rod; 648. Spring. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example 1:

[0032] Please see Figure 1-3A high-speed stepper motor for satellite applications includes a motor housing 1, a rear cover 2 fixedly connected to the rear end of the motor housing 1 by bolts, a front cover 3 fixedly connected to the front end of the motor housing 1 by bolts, and multiple heat dissipation vents 4 at the front end of the front cover 3. An internal structure 5 is fixedly connected to the inner cavity of the motor housing 1, and a rotor structure 6 is fixedly connected to the outside of the internal structure 5. The internal structure 5 includes a shaft 51, and two bearings 52 are fixedly connected to the outer surface of the shaft 51. The bearing 52 located on the front side is fixedly installed on the inner surface of the front cover 3, and the bearing 52 located on the rear side is fixedly installed on the inner surface of the rear cover 2. Two heat dissipation components 53 are fixedly connected to the outer surface of the shaft 51.

[0033] The heat dissipation assembly 53 includes a positioning ring 531. The outer surface of the positioning ring 531 is fixedly connected to the inner cavity of the motor housing 1. At least one bearing 532 is fixedly connected to the inner cavity of the positioning ring 531. A connecting ring 533 is fixedly connected to the inner surface of the bearing 532. Multiple connecting rods 534 are fixedly connected to the inner surface of the connecting ring 533. A bushing ring 535 is fixedly connected to the end of the multiple connecting rods 534 away from the connecting ring 533. The inner surface of the bushing ring 535 is fixedly connected to the outer surface of the rotating shaft 51. A fan blade 536 is fixedly connected to the outer surface of the bushing ring 535.

[0034] The rotating shaft 51 is made of 40CrNiMoA alloy structural steel, which has high strength, high toughness and good hardenability, good wear resistance and fatigue resistance, and can ensure the reliability of the rotating shaft 51 under long-term high-speed rotation. It is the mounting base for multiple components (such as bearing 52, bushing ring 535, N-pole rotor 62 and S-pole rotor 63, heat-conducting ring 641, etc.).

[0035] The fan blade 536 is made of polyetheretherketone, which has excellent high temperature resistance and chemical corrosion resistance. It can rotate under the drive of the shaft 51 to generate wind force that blows from the rear cover 2 of the motor to the front cover 3 of the motor. The air flow carries away the heat inside the motor and achieves heat dissipation.

[0036] This solution uses heat dissipation components 53 on both sides of the stator ring 61 and rotor structure 6 to quickly dissipate heat from the motor, effectively preventing overheating and motor overload. Since the bushing ring 535 is fixed on the shaft 51, when the shaft 51 rotates, it drives the fan blades 536 located outside it to rotate. When the fan blades 536 rotate, they generate wind. By setting the direction of the fan blades 536, the wind can be blown from the rear cover 2 of the motor to the front cover 3 of the motor and discharged from the heat dissipation port 4. When the wind passes over the stator ring 61 and rotor structure 6, it carries away heat, thereby achieving the purpose of heat dissipation.

[0037] Meanwhile, to ensure the stability of the motor during high-speed operation, the shaft 51 can be limited by the bushing ring 535 in conjunction with multiple connecting rods 534. Since the bushing ring 535 is fixed on the shaft 51 and the positioning ring 531 is fixed on the inner wall of the motor housing 1, the two together with the two bearings 532, the multiple connecting rods 534 and the connecting ring 533 form a support frame, which can support and limit the shaft 51 to prevent the shaft 51 from deviating significantly during rotation. When the shaft 51 rotates, it will rotate the bushing ring 535 and the multiple connecting rods 534 together. The multiple connecting rods 534 will then transmit the rotational force to the connecting ring 533, allowing the connecting ring 533 to rotate with the cooperation of the two bearings 532, ensuring that the rotational speed of the shaft 51 is not reduced while providing stable support for the shaft 51.

[0038] Please see Figure 4-6 The rotor structure 6 includes a stator ring 61, two N-pole rotors 62 and two S-pole rotors 63. The outer surface of the stator ring 61 is fixedly installed in the inner cavity of the motor housing 1. The two N-pole rotors 62 are fixedly installed on the outer surface of the shaft 51. The two S-pole rotors 63 are fixedly installed on the outer surface of the shaft 51. A magnetic isolation component 64 is provided between the N-pole rotors 62 and the S-pole rotors 63.

[0039] The magnetic shielding assembly 64 includes a heat-conducting ring 641. The inner surface of the heat-conducting ring 641 is fixedly connected to the outer surface of the rotating shaft 51. The heat-conducting ring 641 is located between the N-pole rotor 62 and the S-pole rotor 63. The outer surface of the heat-conducting ring 641 has multiple storage slots 642. The inner cavity of each of the multiple storage slots 642 is fixedly connected to two slide rails 643. The outer surface of each of the two slide rails 643 is slidably connected to a slider 644. The ends of the two sliders 644 that are close to each other are fixedly connected to a magnetic resistance adjustment plate 645. The bottom wall of the inner cavity of the storage slots 642 is fixedly connected to multiple hollow tubes 646. The inner cavity of the hollow tubes 646 is slidably connected to a telescopic rod 647. The upper end of the telescopic rod 647 is fixedly connected to the lower end of the magnetic resistance adjustment plate 645. A spring 648 is sleeved on the outer surface of the telescopic rod 647.

[0040] The stator ring 61 is made of high-silicon electrical steel sheets, which have the characteristics of low magnetic permeability and low iron loss.

[0041] Both the N-pole rotor 62 and the S-pole rotor 63 are made of neodymium iron boron permanent magnets, which have high magnetic energy product and high coercivity. They can generate a constant magnetic field that interacts with the alternating magnetic field generated by the stator iron ring 61, and drive the rotating shaft 51 to rotate under the action of the magnetic force.

[0042] The heat-conducting ring 641 is made of oxygen-free copper, which has excellent thermal conductivity. It can conduct heat from the gap between the N-pole rotor 62 and the S-pole rotor 63 near the shaft 51 to a position away from the shaft 51, so that the heat can be carried away by the airflow.

[0043] The magnetic reluctance adjustment plate 645 is made of a composite material of titanium alloy and diamond coating. It has low magnetic permeability and high thermal conductivity. When it extends outward at high speed, it can increase the magnetic reluctance between the two rotor poles, weaken the magnetic field coupling strength, and reduce hysteresis loss and heat generation. At the same time, it can quickly transfer the heat in the gap to the surface, so that the heat can be carried away by the airflow generated by the fan blade 536.

[0044] In this embodiment, the heat-conducting ring 641 is half the number of rotors, with two rings, and is set between the corresponding two sets of N-pole rotors 62 and S-pole rotors 63; the number of receiving grooves 642 and magnetic resistance adjustment plates 645 is the same, preferably three, so as to cover the gap between the N-pole rotors 62 and S-pole rotors 63 as much as possible while ensuring ventilation.

[0045] Due to the characteristics of stepper motor operation, its speed gradually increases during operation. At low speed and high load, the centrifugal force is insufficient to deform the spring 648 in the magnetic isolation component 64. The three magnetic reluctance adjustment plates 645 will remain in their corresponding storage slots 642 and cannot pop out. The magnetic field path between the two pole rotors is mainly composed of air with high magnetic permeability. The magnetic reluctance is reduced and the magnetic field coupling strength of the N-pole rotor 62 and S-pole rotor 63 is enhanced, which synergistically improves the driving force of the stator iron ring 61 on them, adapting to the demand for high torque at low speed.

[0046] At high speed and light load, the rotational speed of the shaft 51 increases, and the centrifugal force can overcome the tension of the spring 648. This allows the three magnetic reluctance adjustment plates 645 to extend outward along the slide rail 643 with the cooperation of the corresponding sliders 644, increasing their proportion in the magnetic field path. Since the magnetic reluctance adjustment plates 645 use a low permeability material, they will increase the magnetic reluctance between the two pole rotors, weaken the magnetic field coupling strength, and avoid hysteresis loss and heat generation caused by excessive superposition of the two pole magnetic fields at high speed. This further improves the stability of the motor when running at high speed. The operation of the three magnetic reluctance adjustment plates 645 between the other set of N-pole rotors 62 and S-pole rotors 63 is also the same.

[0047] It should be noted that the specific installation methods and control methods of each component in this utility model are all conventional designs, and will not be described in detail in this utility model.

[0048] Working principle:

[0049] After the motor is powered on, the wires wound on the stator ring 61 generate an alternating magnetic field under the action of the current. This magnetic field interacts with the magnetic fields generated by the N-pole rotor 62 and the S-pole rotor 63, driving the N-pole rotor 62 and the S-pole rotor 63 to rotate alternately. When either the N-pole rotor 62 or the S-pole rotor 63 rotates, it will drive the shaft 51 to rotate in the cooperation of two bearings 52. By adding a set of N-pole rotors 62 and S-pole rotors 63, the magnetic field strength can be significantly improved, thereby increasing the driving torque on the shaft 51, and ultimately increasing the rotational speed of the shaft 51.

[0050] To ensure the motor can operate continuously and stably at high speed, two heat dissipation components 53 are installed on both sides of the stator ring 61 and the rotor structure 6. Since the bushing ring 535 is fixed on the rotating shaft 51, when the rotating shaft 51 rotates, the bushing ring 535 will rotate accordingly, thereby driving the fan blades 536 fixed on its outer surface to rotate synchronously. The fan blades 536 are specially designed so that the wind generated when they rotate can blow along the inside of the motor from the rear cover 2 to the front cover 3. When the wind passes over the surface of the stator ring 61 and the rotor structure 6, it will exchange heat with these components, taking away the surface heat. Then the airflow carrying the heat is discharged to the outside of the motor through the heat dissipation port 4 on the front cover 3, thereby achieving the purpose of heat dissipation.

[0051] To ensure the stability of the motor during high-speed operation, the bushing ring 535, together with multiple connecting rods 534, effectively limits the rotation of the shaft 51. The bushing ring 535 is fixed on the shaft 51, and the positioning ring 531 is fixed on the inner wall of the motor housing 1. Together with the two bearings 532, the multiple connecting rods 534, and the connecting ring 533, they form a stable support frame. The support frame can provide multi-directional support and limit the rotation of the shaft 51, effectively preventing the shaft 51 from shifting significantly due to centrifugal force and other factors during high-speed rotation. At the same time, when the shaft 51 rotates, it will drive the bushing ring 535 and the multiple connecting rods 534 to rotate together. The connecting rods 534 then transmit the rotational force to the connecting ring 533, causing the connecting ring 533 to rotate under the rolling friction of the two bearings 532. This structural design provides stable support for the shaft 51 while minimizing the impact on the rotation speed of the shaft 51.

[0052] Because there is a gap between the N-pole rotor 62 and the S-pole rotor 63, wind power alone is insufficient to effectively remove the heat from the gap. Therefore, a heat-conducting ring 641 is placed between them. When wind passes over the stator ring 61 and the surfaces of the N-pole rotor 62 and the S-pole rotor 63, it carries away the heat from the surfaces of these components. This results in a temperature gradient, where the heat near the shaft 51 is higher than the heat further away from the shaft 51. Since the heat-conducting ring 641 is made of a highly thermally conductive material, heat is transferred from the high-temperature region to the low-temperature region through the heat-conducting ring 641. The heat is discharged outward at the rotating shaft 51. When the motor is running at high speed, when the centrifugal force increases to a level sufficient to overcome the tension of the spring 648, the magnetic resistance adjustment plate 645 extends outward along the slide rail 643 with the cooperation of the slider 644. The magnetic resistance adjustment plate 645 is also made of heat-conducting material. Its extension increases the contact area with the air in the gap, so that the heat in the gap can be discharged more efficiently from the inside to the outside to the position where the wind can blow under the combined action of the heat-conducting ring 641 and the magnetic resistance adjustment plate 645, and is easily carried away by the airflow, further improving the heat dissipation efficiency of the motor.

[0053] During operation, the stepper motor's speed gradually increases. At low speed and high load, the rotational speed of the shaft 51 is low, resulting in a small centrifugal force that is insufficient to deform the spring 648 in the magnetic isolation assembly 64. Therefore, the three magnetic reluctance adjustment plates 645 are stably stored in their corresponding storage slots 642 and cannot pop out. At this time, the magnetic field path between the N-pole rotor 62 and the S-pole rotor 63 is mainly composed of air with high permeability and low magnetic reluctance, which enhances the magnetic field coupling strength of the two rotors. This, in turn, improves the driving force of the stator ring 61 on them, which can well meet the demand for high torque at low speed.

[0054] When the motor is under high speed and light load, the rotation speed of the shaft 51 increases, and the centrifugal force generated increases. When the centrifugal force exceeds the tension of the spring 648, the three magnetic reluctance adjustment plates 645 will extend outward along the slide rail 643 with the cooperation of the corresponding sliders 644. After the three magnetic reluctance adjustment plates 645 extend and rotate at high speed, their proportion in the magnetic field path will increase. Since the magnetic reluctance adjustment plates 645 are made of low magnetic permeability material, they will increase the magnetic reluctance between the two pole rotors and weaken the magnetic field coupling strength. This avoids the hysteresis loss and heat generation caused by the excessive superposition of the two pole magnetic fields under high speed, and further improves the stability of the motor when running at high speed.

[0055] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A high-speed stepper motor for satellite applications, comprising a motor housing (1), characterized in that: The rear end of the motor housing (1) is fixedly connected to the motor rear cover (2) by bolts. The front end of the motor housing (1) is fixedly connected to the motor front cover (3) by bolts. The front end of the motor front cover (3) has multiple heat dissipation vents (4). The inner cavity of the motor housing (1) is fixedly connected to an internal structure (5). The outside of the internal structure (5) is fixedly connected to a rotor structure (6). The internal structure (5) includes a rotating shaft (51). The outer surface of the rotating shaft (51) is fixedly connected to two bearings (52). The bearings (52) located on the front side are fixedly installed on the inner surface of the motor front cover (3). The bearings (52) located on the rear side are fixedly installed on the inner surface of the motor rear cover (2). The outer surface of the rotating shaft (51) is fixedly connected to two heat dissipation components (53).

2. The high-speed stepper motor for satellites according to claim 1, characterized in that: The heat dissipation assembly (53) includes a positioning ring (531), at least one bearing (532) is fixedly connected to the inner cavity of the positioning ring (531), a connecting ring (533) is fixedly connected to the inner surface of the bearing (532), a plurality of connecting rods (534) are fixedly connected to the inner surface of the connecting ring (533), and a bushing ring (535) is fixedly connected to the end of the plurality of connecting rods (534) away from the connecting ring (533), and a fan blade (536) is fixedly connected to the outer surface of the bushing ring (535).

3. The high-speed stepper motor for satellites according to claim 1, characterized in that: The rotor structure (6) includes a stator ring (61), two N-pole rotors (62) and two S-pole rotors (63). The outer surface of the stator ring (61) is fixedly installed in the inner cavity of the motor housing (1). The two N-pole rotors (62) are fixedly installed on the outer surface of the shaft (51). The two S-pole rotors (63) are fixedly installed on the outer surface of the shaft (51). A magnetic isolation component (64) is provided between the N-pole rotors (62) and the S-pole rotors (63).

4. A high-speed stepper motor for satellites according to claim 3, characterized in that: The magnetic shielding assembly (64) includes a heat-conducting ring (641). The outer surface of the heat-conducting ring (641) is provided with multiple storage slots (642). The inner cavity of each of the multiple storage slots (642) is fixedly connected to two slide rails (643). The outer surface of each of the two slide rails (643) is slidably connected to a slider (644). The two sliders (644) are fixedly connected to a magnetic resistance adjustment plate (645) at their close ends. The bottom wall of the inner cavity of the storage slot (642) is fixedly connected to multiple hollow tubes (646). The inner cavity of each hollow tube (646) is slidably connected to a telescopic rod (647). The upper end of the telescopic rod (647) is fixedly connected to the lower end of the magnetic resistance adjustment plate (645). The outer surface of the telescopic rod (647) is fitted with a spring (648).

5. A high-speed stepper motor for satellites according to claim 4, characterized in that: The inner surface of the heat-conducting ring (641) is fixedly connected to the outer surface of the rotating shaft (51), and the heat-conducting ring (641) is located between the N-pole rotor (62) and the S-pole rotor (63).

6. A high-speed stepper motor for satellites according to claim 2, characterized in that: The inner surface of the bushing ring (535) is fixedly connected to the outer surface of the rotating shaft (51), and the outer surface of the positioning ring (531) is fixedly connected to the inner cavity of the motor housing (1).

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