Single-coil zigzag magnetic circuit magnetorheological damper for flywheel

Abstract

The single-coil zigzag magnetic circuit magnetorheological damper comprises an upper supporting assembly, a lower supporting assembly and a damping channel assembly, the upper supporting assembly comprises a reinforcing block, a rubber supporting block and an upper support, and the lower supporting assembly comprises a rubber bottom film and a lower support. The damping channel assembly comprises a main iron core, a magnetism isolating plate, a magnet exciting coil, an inner magnetism isolating ring, an outer magnetism isolating ring and an extrusion plate. The single-coil zigzag magnetic circuit magneto-rheological damper for the flywheel is used for reducing small displacement vibration between the space flywheel and the base, damping force output by the magneto-rheological damper is timely adjusted through semi-active control according to the dynamic response of the flywheel so as to reduce vibration, and the control precision and stability of the flywheel can be improved; in addition, the damper makes full use of magnetic isolation materials to form multiple magnetic circuits, the size and the weight are reduced, the adjustable range of damping force is enlarged, reliability is high, and the damper is suitable for being applied in space.

Description

Technical Field

[0001] The invention relates to the field of satellites, and in particular to a single-coil zigzag magnetic circuit magnetorheological damper for a flywheel. Background Art

[0002] High-precision spacecraft, whether high-resolution satellites or space telescopes, have very strict requirements on the attitude stability and pointing accuracy of the spacecraft platform to meet the performance requirements of the payload. The flywheel is currently the key actuator used in spacecraft attitude control. Due to the static and dynamic unbalanced characteristics of the momentum wheel high-speed rotor and factors such as bearings, the flywheel becomes one of the main sources of disturbance that affects the stability of the spacecraft platform and the pointing performance of the payload. Therefore, it is necessary to study the vibration reduction device of the flywheel system.

[0003] At present, the flywheel system mainly adopts passive vibration isolation, and does not use semi-active vibration reduction devices such as magnetorheological dampers. Passive vibration reduction devices cannot adjust their own parameters according to the system response. Active vibration reduction devices require external energy input, which consumes a lot of energy and has low reliability. The shear yield stress of magnetorheological fluid changes with the change of the external magnetic field. This change is fast, reversible and controllable, and can effectively reduce the vibration within a wide frequency range of 0 to 500 Hz. Magnetorheological dampers use this characteristic of magnetorheological fluid to change the output damping force of the magnetorheological damper by controlling the current in the excitation coil to change the magnetic field strength, thereby attenuating the vibration generated by the flywheel. This process responds quickly, is continuous and reversible, and can improve the control accuracy and stability of the flywheel. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a single-coil zigzag magnetic circuit magnetorheological damper for a flywheel, comprising an upper support assembly, a lower support assembly, and a damping channel assembly;

[0005] The upper support assembly comprises a reinforcement block, a rubber support block, and an upper bracket, wherein the rubber support block is vulcanized into one piece with the reinforcement block and the upper bracket respectively;

[0006] The reinforcing block and the rubber supporting block are provided with hole structures for liquid injection and exhaust;

[0007] The lower support assembly comprises a rubber bottom membrane and a lower bracket, and the rubber bottom membrane and the lower bracket are vulcanized into one body;

[0008] The damping channel assembly includes a main iron core, a magnetic isolation plate, an excitation coil, an inner magnetic isolation ring, an outer magnetic isolation ring, and an extrusion plate;

[0009] The damping channel assembly is a single-coil multi-magnetic circuit hybrid magnetorheological damper, and is located between the upper bracket and the lower bracket;

[0010] The upper bracket and the lower bracket are connected with screws for pressing the damping channel assembly;

[0011] A moving rod runs through the reinforcing block, and the two are connected by threads;

[0012] An extrusion plate is provided below the motion rod, and the two are connected by threads;

[0013] The extrusion plate is provided with a slot for placing a magnetic isolation sheet;

[0014] The bottom surface of the main iron core is provided with a magnetic isolation plate, and the inner wall of the main iron core is provided with a magnetic isolation sleeve;

[0015] The outer surface of the main iron core is provided with coil slots, and the excitation coil is wound on the coil slots of the main iron core;

[0016] The main iron core is equipped with an inner magnetic isolation ring and an outer magnetic isolation ring, a secondary iron core is placed between the inner magnetic isolation ring and the outer magnetic isolation ring, the secondary iron core is fixed by the inner magnetic isolation ring and the outer magnetic isolation ring, and the inner magnetic isolation ring and the outer magnetic isolation ring are fixed on the main iron core;

[0017] The main iron core is provided with a wire groove, and the lower bracket is provided with a wire groove. The lead wire first passes through the wire groove of the main iron core and then is led out through the wire groove of the lower bracket, and the wire outlet is sealed with silica gel;

[0018] The excitation coil can realize both flow and extrusion modes at the same time. The wire groove arranged in the main iron core is a flow damping channel, and an extrusion damping channel is formed between the extrusion plate and the main iron core and the auxiliary iron core.

[0019] Sealing rings are installed on the matching surfaces of the upper bracket and the lower bracket, the upper bracket and the main iron core, and the lower bracket and the main iron core;

[0020] A decoupling film is arranged above the magnetic isolation plate;

[0021] The decoupling membrane is used to close the magnetorheological fluid channel when the frequency is low and the amplitude is large. When the frequency is high and the amplitude is small, the decoupling membrane is in the middle position, allowing the magnetorheological fluid to pass through, alleviating the upper and lower pressure fluctuations and inhibiting high-frequency dynamic hardening.

[0022] A closed chamber filled with magnetorheological fluid is formed between the rubber support block and the rubber bottom membrane, the upper chamber is above the damping channel assembly, and the lower chamber is below the damping channel assembly;

[0023] Under the action of the magnetic isolation material, the magnetorheological fluid reaches the main iron core through the flow damping channel, reaches the extrusion plate through the extrusion channel, reaches the auxiliary iron core through the extrusion damping channel, reaches the extrusion plate through the extrusion channel, and finally reaches the main iron core through the extrusion channel, forming a closed magnetic circuit, making full use of the magnetic isolation ring to realize the round trip of the magnetic circuit and increase the adjustable damping force;

[0024] The single-coil zigzag magnetic circuit magnetorheological damper for a flywheel controls the magnitude of the damping force by adjusting the current to achieve semi-active control. Even if the semi-active control fails, the rubber support block can still achieve passive control, and the reliability is high.

[0025] Preferably, the extruded plate is made of electrical pure iron;

[0026] Preferably, the magnetic isolation sleeve, the upper bracket, the lower bracket, the magnetic isolation plate, the inner magnetic isolation ring, the outer magnetic isolation ring and the magnetic isolation sheet are all made of aluminum alloy material.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The single-coil zigzag magnetic circuit magnetorheological damper of the present invention is used to reduce small displacement vibrations between a space flywheel and a mounting bracket. The damper can adjust the output damping force of the magnetorheological damper in a timely manner through semi-active control according to the dynamic response of the flywheel to reduce vibration, thereby improving the control accuracy and stability of the flywheel. In addition, the damper can simultaneously realize both the extrusion mode and the flow mode with only one coil, and fully utilizes magnetic isolation materials to form multiple magnetic circuits, which not only reduces the volume and weight, but also increases the adjustable range of the damping force. It has high reliability and is suitable for application in space. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions disclosed in the present invention, the following briefly introduces the drawings required to be used in some embodiments disclosed in the present invention. Obviously, the drawings described below are only drawings of some embodiments disclosed in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments disclosed in the present invention, the actual process of the method, etc.

[0030] Figure 1 It is a cross-sectional schematic diagram of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0031] Figure 2 It is a schematic structural diagram of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0032] Figure 3 It is a top view of the extrusion plate of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0033] Figure 4 It is a schematic cross-sectional view of an extruded plate of a single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0034] Figure 5 It is a top view of the main iron core of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0035] Figure 6 It is a schematic cross-sectional view of the main iron core of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0036] Figure 7 It is a top view of the outer magnetic isolation ring of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0037] Figure 8 This is a cross-sectional schematic diagram of the outer magnetic isolation ring of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0038] Fig. 9 The present invention is a bottom view of the outer magnetic isolation ring of the single-coil zigzag magnetic circuit magnetorheological damper.

[0039] Fig.10 It is a cross-sectional schematic diagram of the lower bracket of the single-coil zigzag magnetic circuit magnetorheological damper of the present invention.

[0040] The accompanying drawings are marked as follows: 1. moving rod; 2. reinforcement block; 3. rubber support block; 4. magnetic isolation sleeve; 5. upper bracket; 6. auxiliary iron core; 7. main iron core; 8. rubber bottom membrane; 9. lower bracket; 10. decoupling membrane; 11. magnetic isolation plate; 12. sealing ring; 13. excitation coil; 14. inner magnetic isolation ring; 15. outer magnetic isolation ring; 16. magnetic isolation sheet; 17. extrusion plate; 18. main iron core wire groove; 19. lower bracket wire groove. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] like Figures 1 to 10 The figure shows a schematic diagram of a single-coil zigzag magnetic circuit magnetorheological damper of the present invention, which includes an upper support assembly, a lower support assembly, and a damping channel assembly;

[0043] The upper support assembly comprises a reinforcement block (2), a rubber support block (3), and an upper bracket (5); the rubber support block (3) is vulcanized into one piece with the reinforcement block (2) and the upper bracket (5) respectively;

[0044] The reinforcing block (2) and the rubber supporting block (3) are provided with hole structures for liquid injection and exhaust;

[0045] The lower support assembly comprises a rubber bottom membrane (8) and a lower bracket (9), wherein the rubber bottom membrane (8) and the lower bracket (9) are vulcanized into one piece;

[0046] The damping channel assembly comprises a main iron core (7), a magnetic isolation plate (11), an excitation coil (13), an inner magnetic isolation ring (14), an outer magnetic isolation ring (15), and an extrusion plate (17);

[0047] The damping channel component is a single-coil multi-magnetic circuit hybrid magnetorheological damper, and is located between the upper bracket (5) and the lower bracket (9);

[0048] The upper bracket (5) and the lower bracket (9) are connected by screws for pressing the damping channel assembly;

[0049] The reinforcing block (2) is penetrated by a moving rod (1), and the two are connected by threads;

[0050] A squeezing plate (17) is provided below the movement rod (1), and the two are connected by threads;

[0051] The extrusion plate (17) is provided with a slot for placing the magnetic isolation sheet (16);

[0052] The bottom surface of the main iron core (7) is provided with a magnetic isolation plate (11), and the inner wall of the main iron core (7) is installed with a magnetic isolation sleeve (4);

[0053] The main iron core (7) is provided with coil slots on its outer surface, and the excitation coil (13) is wound on the coil slots of the main iron core (7);

[0054] The main iron core (7) is provided with an inner magnetic isolation ring (14) and an outer magnetic isolation ring (15), a secondary iron core (6) is placed between the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15), the secondary iron core (6) is fixed by the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15), and the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15) are fixed on the main iron core (7);

[0055] The main iron core (7) is provided with a wire groove (18), and the lower bracket (9) is provided with a wire groove (19). The lead wire first passes through the wire groove (18) of the main iron core (7) and then passes through the wire groove (19) of the lower bracket (9) to be led out, and the wire outlet is sealed with silica gel;

[0056] The excitation coil (13) can realize two modes, flow and extrusion, at the same time; the wire groove (18) provided in the main iron core is a flow damping channel; and an extrusion damping channel is formed between the extrusion plate (17) and the main iron core (7) and the auxiliary iron core (6);

[0057] Sealing rings (12) are installed on the matching surfaces of the upper bracket (5) and the lower bracket (9), the upper bracket (5) and the main iron core (7), and the lower bracket (9) and the main iron core (5);

[0058] A decoupling film (10) is arranged above the magnetic isolation plate (11);

[0059] The decoupling film (10) is used to close the magnetorheological fluid channel when the frequency is low and the amplitude is large, and when the frequency is high and the amplitude is small, the decoupling film is in the middle position, allowing the magnetorheological fluid to pass through, alleviating the upper and lower pressure fluctuations and inhibiting high-frequency dynamic hardening;

[0060] A sealed chamber filled with magnetorheological fluid is formed between the rubber support block (3) and the rubber bottom membrane (8); the upper portion of the damping channel assembly is an upper chamber, and the lower portion is a lower chamber;

[0061] Under the action of the magnetic isolation material, the magnetorheological fluid reaches the main iron core (7) through the flow damping channel, reaches the extrusion plate (17) through the extrusion channel, reaches the auxiliary iron core (6) through the extrusion damping channel, reaches the extrusion plate (17) through the extrusion channel, and finally reaches the main iron core (7) through the extrusion channel, thereby forming a closed magnetic circuit, making full use of the magnetic isolation ring to realize the round trip of the magnetic circuit and increasing the adjustable damping force;

[0062] The single-coil zigzag magnetic circuit magnetorheological damper for a flywheel controls the magnitude of the damping force by adjusting the current to achieve semi-active control; even if the semi-active control fails, the rubber support block (3) can still achieve passive control, thus achieving high reliability.

[0063] Preferably, the extruded plate (17) is made of electrical pure iron;

[0064] Preferably, the magnetic isolation sleeve (4), the upper bracket (5), the lower bracket (9), the magnetic isolation plate (11), the inner magnetic isolation ring (14), the outer magnetic isolation ring (15), and the magnetic isolation sheet (16) are all made of aluminum alloy material.

[0065] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention using the above disclosed contents without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the contents of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel, characterized in that: The shock absorber comprises an upper support assembly, a lower support assembly, and a damping channel assembly, wherein: The upper support assembly comprises a reinforcement block (2), a rubber support block (3), and an upper bracket (5); the rubber support block (3) is vulcanized into one piece with the reinforcement block (2) and the upper bracket (5) respectively; The reinforcing block (2) and the rubber supporting block (3) are provided with hole structures for liquid injection and exhaust; The lower support assembly comprises a rubber bottom membrane (8) and a lower bracket (9), wherein the rubber bottom membrane (8) and the lower bracket (9) are vulcanized into one piece; The damping channel assembly comprises a main iron core (7), a magnetic isolation plate (11), an excitation coil (13), an inner magnetic isolation ring (14), an outer magnetic isolation ring (15), and an extrusion plate (17); The damping channel component is a single-coil multi-magnetic circuit hybrid magnetorheological damper, and is located between the upper bracket (5) and the lower bracket (9); The upper bracket (5) and the lower bracket (9) are connected by screws for tightening the damping channel assembly.

2. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: The reinforcing block (2) is penetrated by a moving rod (1), and the two are connected by threads.

3. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1 or 2, characterized in that: A pressing plate (17) is arranged below the movement rod (1), and the two are connected via threads.

4. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: The extrusion plate (17) is provided with a slot for accommodating the magnetic isolation sheet (16).

5. The single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: The bottom surface of the main iron core (7) is provided with a magnetic isolation plate (11), and the inner wall of the main iron core (7) is installed with a magnetic isolation sleeve (4); The main iron core (7) is provided with coil slots on its outer surface, and the excitation coil (13) is wound on the coil slots of the main iron core (7); The main iron core (7) is provided with an inner magnetic isolation ring (14) and an outer magnetic isolation ring (15), a secondary iron core (6) is placed between the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15), the secondary iron core (6) is fixed by the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15), and the inner magnetic isolation ring (14) and the outer magnetic isolation ring (15) are fixed on the main iron core (7); The main iron core (7) is provided with a wire groove (18), and the lower bracket (9) is provided with a wire groove (19). The lead wire first passes through the wire groove (18) of the main iron core (7) and then passes through the wire groove (19) of the lower bracket (9) to be led out, and the wire outlet is sealed with silica gel.

6. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1 or 5, characterized in that: The excitation coil (13) can realize two modes, flow and extrusion, at the same time; the wire groove (18) provided in the main iron core is a flow damping channel; and an extrusion damping channel is formed between the extrusion plate (17) and the main iron core (7) and the auxiliary iron core (6).

7. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: Sealing rings (12) are installed on the matching surfaces of the upper bracket (5) and the lower bracket (9), the upper bracket (5) and the main iron core (7), and the lower bracket (9) and the main iron core (5).

8. The single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: A decoupling film (10) is arranged above the magnetic isolation plate (11); The decoupling film (10) is used to close the magnetorheological fluid channel when the frequency is low and the amplitude is large, and when the frequency is high and the amplitude is small, the decoupling film is in the middle position, allowing the magnetorheological fluid to pass through, thereby alleviating the upper and lower pressure fluctuations and suppressing high-frequency dynamic hardening.

9. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: A sealed chamber filled with magnetorheological fluid is formed between the rubber support block (3) and the rubber bottom membrane (8); the upper portion of the damping channel assembly is an upper chamber, and the lower portion is a lower chamber; Under the action of magnetic isolation materials, magnetorheological The liquid reaches the main iron core (7) through the flow damping channel, reaches the extrusion plate (17) through the extrusion channel, reaches the auxiliary iron core (6) through the extrusion damping channel, reaches the extrusion plate (17) through the extrusion channel, and finally reaches the main iron core (7) through the extrusion channel, thereby forming a closed magnetic circuit. The magnetic isolation ring is fully utilized to realize the reciprocation of the magnetic circuit, thereby increasing the adjustable damping force.

10. A single-coil zigzag magnetic circuit magnetorheological damper for a flywheel according to claim 1, characterized in that: The single-coil zigzag magnetic circuit magnetorheological damper for a flywheel controls the magnitude of the damping force by adjusting the current, thereby achieving semi-active control; even if the semi-active control fails, the rubber support block (3) can still achieve passive control, thus achieving high reliability.

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