A large initial thrust electromagnetic actuator with multiple magnetic field mixing

Abstract

The application discloses a large initial thrust electromagnetic actuator with multi-magnetic field mixing effect and belongs to the technical field of aerospace. The application solves the problem that the existing electromagnetic actuator has small initial thrust and causes the spacecraft to be unable to separate at a predetermined speed. The stator comprises an outer magnetic structure, an inner magnetic structure, an upper magnetic structure, a lower magnetic structure and a stator coil structure, the lower magnetic structure comprises a lower magnetic yoke and a lower inner axial magnetic ring and a lower outer axial magnetic ring which are installed at the top end of the lower magnetic yoke, and the inner magnetic structure comprises an inner magnetic yoke and an inner upper radial magnetic ring, an inner middle axial magnetic ring and an inner lower radial magnetic ring which are coaxial and are sequentially sleeved on the outside of the inner magnetic yoke from top to bottom. The magnetic flux loop formed by two small-height radial magnetizing permanent magnetic rings is utilized to increase the air gap magnetic field intensity of the part close to the stator coil between the two high-height radial permanent magnetic rings, so that the ampere force borne by the mover coil is increased, and the initial thrust is increased.

Description

Technical Field

[0001] This invention relates to a large initial thrust electromagnetic actuation device with multiple magnetic field mixing, belonging to the field of aerospace technology. Background Technology

[0002] With the development of aerospace technology and the continuous exploration of space, a large number of spacecraft are currently operating in orbit. Some of them have reached the end of their service life, run out of fuel, or become space debris due to component failure. However, through space service measures such as on-orbit maintenance or replacement of components, refueling, or changing service orbits, the service life of spacecraft can be extended and the application cost of spacecraft can be reduced.

[0003] For on-orbit servicing missions, servicing spacecraft need to rendezvous and dock with the target spacecraft before refueling and maintenance services can be performed. After completing the servicing mission, the servicing spacecraft needs to separate the target spacecraft and return it to its working orbit. This requires a reusable spacecraft separation device capable of adjusting the separation speed for different types of spacecraft. Patent CN113572334 B describes a dual-magnetic-circuit electromagnetic actuator with compensating magnets. It utilizes a single-layer magnetic pole structure to form front and rear dual permanent magnet branch loops, achieving permanent magnet flux shunting, alleviating magnetic saturation of the yoke, and reducing the yoke thickness. Simultaneously, the compensating magnets at both ends increase the magnetomotive force in the front and rear permanent magnet branch loops, increasing the air gap magnetic field strength and thrust density. Patent CN113443176 B describes an electromagnetic actuator for a nanosatellite deployment device, which uses multiple magnetic rings connected in series to form a single closed permanent magnet loop to increase the inner and outer air gap magnetic field strength. Patent CN113562203B describes an electromagnetic actuator with a redundant air gap. This utilizes a magnetic isolation ring to create a redundant air gap, effectively alleviating local magnetic saturation and forming an auxiliary permanent magnet circuit. This increases the magnetic flux density of the end air gap and ensures a uniform magnetic field distribution. Patent CN113572335B describes a single-layer magnetic pole electromagnetic actuator with dual windings. This utilizes a guiding magnetic ring to solve the problem of magnetic field cancellation caused by opposing magnetic circuits. It also guides the magnetic flux of different branches, reducing magnetic leakage and improving the air gap magnetic field.

[0004] However, current electromagnetic actuators all have relatively low initial thrust, while spacecraft require a large initial thrust to achieve separation under certain conditions. Therefore, in order to meet the mission requirements of various types of spacecraft separating after completing on-orbit service, there is an urgent need for an electromagnetic actuator with a large initial thrust. Summary of the Invention

[0005] The present invention aims to solve the problem that the spacecraft cannot separate at the predetermined speed due to the small initial thrust of existing electromagnetic actuators, and thus provides a large initial thrust electromagnetic actuator with the combined action of multiple magnetic fields.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A high initial thrust electromagnetic actuation device with multiple magnetic field mixing effects, comprising a stator and a mover.

[0008] The stator includes an outer magnetic structure, an inner magnetic structure, an upper magnetic structure, a lower magnetic structure, and a stator coil structure.

[0009] The lower magnetic structure includes a lower magnetic yoke and a lower inner axial magnetic ring and a lower outer axial magnetic ring mounted on the top of the lower magnetic yoke.

[0010] The lower inner axial magnetic ring and the lower outer axial magnetic ring are sequentially fitted onto the outer side of the inner magnetic yoke from the inside out.

[0011] The outer magnetic structure is fitted onto the outside of the inner magnetic structure.

[0012] The external magnetic structure includes an external magnetic yoke and three coaxial magnetic rings, an outer upper radial magnetic ring, an outer central axial magnetic ring, and an outer lower radial magnetic ring, which are sequentially inserted into the external magnetic yoke from top to bottom.

[0013] The inner magnetic structure includes an inner magnetic yoke and three coaxial inner upper radial magnetic ring, an inner central axial magnetic ring, and an inner lower radial magnetic ring, which are sequentially fitted around the inner magnetic yoke from top to bottom.

[0014] The outer upper radial magnetic ring and the inner upper radial magnetic ring, the outer central axial magnetic ring and the inner central axial magnetic ring, and the outer lower radial magnetic ring and the inner lower radial magnetic ring are respectively arranged radially in correspondence.

[0015] The bottom ends of both the outer and inner magnetic yokes are fixedly connected to the lower magnetic yoke.

[0016] The upper magnetic structure includes an upper magnetic yoke and an upper axial magnetic ring located at the bottom end of the upper magnetic yoke.

[0017] The top ends of both the outer and inner magnetic yokes are fixedly connected to the upper magnetic yoke.

[0018] The upper axial magnetic ring is coaxially inserted between the upper part of the inner magnetic yoke and the upper part of the outer magnetic yoke.

[0019] The top ends of both the inner upper radial magnetic ring and the outer upper radial magnetic ring are in contact with the bottom end of the upper axial magnetic ring.

[0020] The bottom end of the inner lower radial magnetic ring contacts the top end of the lower inner axial magnetic ring, and the bottom end of the outer lower radial magnetic ring contacts the top end of the lower outer axial magnetic ring.

[0021] The stator coil structure is coaxially mounted within the air gap formed between the inner lower radial magnetic ring and the outer lower radial magnetic ring.

[0022] The mover includes a mover coil structure.

[0023] The moving coil structure is located above the stator coil structure and is coaxially inserted into the air gap formed between the inner and outer magnetic structures.

[0024] Furthermore, the stator also includes a stator frame, which includes a base and several stator support rods fixed on the base, with the lower magnetic yoke mounted on the several stator support rods.

[0025] Furthermore, the stator coil frame is fixed to the base by several lower support rods.

[0026] Furthermore, the mover also includes a top plate and several upper support rods, wherein the several upper support rods are slidably inserted into the upper magnetic yoke and the upper axial magnetic ring, and the mover coil structure is fixedly mounted below the top plate by the several upper support rods.

[0027] Furthermore, at least one upper support rod is provided with a linear bearing between it and the upper magnetic yoke.

[0028] Furthermore, the stator coil structure includes a stator coil frame and a stator coil. A first annular groove is machined on the outer side of the stator coil frame along its circumference, and the stator coil is installed in the first annular groove. The mover coil structure includes a mover coil frame and a mover coil. A second annular groove is machined on the outer side of the mover coil frame along its circumference, and the mover coil is installed in the second annular groove.

[0029] Furthermore, both the stator coil frame and the mover coil frame are made of polyimide material, and the outer yoke, inner yoke, upper yoke, and lower yoke are all made of DT4C.

[0030] Furthermore, the materials of the lower inner axial magnetic ring, lower outer axial magnetic ring, outer upper radial magnetic ring, outer middle axial magnetic ring, outer lower radial magnetic ring, inner upper radial magnetic ring, inner middle axial magnetic ring, inner lower radial magnetic ring, and upper axial magnetic ring are all neodymium iron boron N35 permanent magnet materials.

[0031] Furthermore, the magnetization directions of the lower inner axial magnetic ring, lower outer axial magnetic ring, outer upper radial magnetic ring, outer middle axial magnetic ring, outer lower radial magnetic ring, inner upper radial magnetic ring, inner middle axial magnetic ring, inner lower radial magnetic ring, and upper axial magnetic ring are, in sequence: front S rear N, front N rear S, inner S outer N, front S rear N, inner N outer S, inner S outer N, front N rear S, inner N outer S, front S rear N.

[0032] Furthermore, the lower magnetic yoke has a circular plate-like structure with several through holes, and several lower support rods pass through these through holes and are fixed to the stator coil frame.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The electromagnetic actuation device for large initial thrust with multi-magnetic field hybrid action of the present invention utilizes the magnetic flux loop formed by two small radially magnetized permanent magnet rings (i.e., the outer lower radial magnet ring and the inner lower radial magnet ring) to increase the air gap magnetic field strength between the two large radial permanent magnet rings (i.e., the outer upper radial magnet ring and the inner upper radial magnet ring) near the stator coil, thereby increasing the Ampere force on the mover coil and increasing the initial thrust.

[0035] The lower inner axial magnetic ring, lower outer axial magnetic ring, outer upper radial magnetic ring, outer middle axial magnetic ring, outer lower radial magnetic ring, inner upper radial magnetic ring, inner middle axial magnetic ring, inner lower radial magnetic ring and upper axial magnetic ring form a closed air gap and create a constant permanent magnetic field in the air gap. The outer magnetic yoke, upper magnetic yoke, inner magnetic yoke and lower magnetic yoke seal the permanent magnet to reduce magnetic leakage and enhance the magnetic flux density of the air gap magnetic field.

[0036] The moving coil and stator coil are supplied with opposite currents, creating opposing electromagnetic fields. This increases the magnetic flux in the magnetic circuit. The moving coil experiences electromagnetic repulsion from the stator coil and Ampere force from the permanent magnetic field. These two forces work together to increase the initial thrust. The electromagnetic field generated by the stator coil raises the operating point of the two tall radial permanent magnet rings. Simultaneously, the electromagnetic field generated by the stator coil is opposite in direction to that generated by the moving coil, suppressing armature reaction caused by the moving coil. This invention features a compact structure and high initial thrust, meeting the current practical needs of on-orbit space services. It is used for the separation of various types of spacecraft after on-orbit maintenance, ensuring that the spacecraft separates at a predetermined speed. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural schematic diagram of the electromagnetic actuation device for large initial thrust with multiple magnetic field hybrid effects according to the present invention.

[0038] Figure 2 This is a schematic cross-sectional view of the electromagnetic actuation device with large initial thrust due to the combined action of multiple magnetic fields according to the present invention.

[0039] Figure 3 This is a three-dimensional structural diagram of the mover in the electromagnetic actuator with large initial thrust and multiple magnetic field mixing effects of the present invention.

[0040] Figure 4 This is a three-dimensional structural diagram of the external magnetic structure in the large initial thrust electromagnetic actuation device with multiple magnetic field mixing effects of the present invention.

[0041] Figure 5 This is a three-dimensional structural diagram of the internal magnetic structure in the electromagnetic actuator with large initial thrust and multiple magnetic field mixing effects of the present invention.

[0042] Figure 6This is a three-dimensional structural diagram of the upper magnetic structure in the electromagnetic actuator with large initial thrust and multiple magnetic field mixing effects of the present invention.

[0043] Figure 7 This is a three-dimensional structural diagram of the lower magnetic structure in the electromagnetic actuator with large initial thrust and multiple magnetic field mixing effects of the present invention.

[0044] Figure 8 This is a schematic diagram of the connection structure between the stator coil structure and the stator frame of the electromagnetic actuation device with large initial thrust and multiple magnetic field mixing effects of the present invention.

[0045] Figure 9 This is a schematic diagram of the magnetic flux circuit of the electromagnetic actuation device with large initial thrust and multiple magnetic field mixing effects according to the present invention.

[0046] In the picture:

[0047] 1. Top plate; 2. Upper support rod; 3. Linear bearing; 4. Upper magnetic structure; 5. Outer magnetic structure; 6. Lower magnetic structure; 7. Base; 8. Stator support rod; 9. Lower support rod; 10. Upper yoke; 11. Upper axial magnetic ring; 12. Inner yoke; 13. Outer upper radial magnetic ring; 14. Mover coil frame; 15. Mover coil; 16. Outer yoke; 17. Outer central axial magnetic ring; 18. Outer lower radial magnetic ring; 19. Stator coil; 20. Stator coil frame; 21. Lower outer axial magnetic ring; 22. Lower yoke; 23. Lower inner axial magnetic ring; 24. Inner lower radial magnetic ring; 25. Inner central axial magnetic ring; 26. Inner upper radial magnetic ring. Detailed Implementation

[0048] Specific implementation method one: Combining Figures 1-9 This description of embodiments provides a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be noted that the descriptions of "front," "rear," "left," "right," "inner," "outer," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] A high initial thrust electromagnetic actuation device with multiple magnetic field mixing effects, comprising a stator and a mover.

[0052] The stator includes an outer magnetic structure 5, an inner magnetic structure, an upper magnetic structure 4, a lower magnetic structure 6, and a stator coil structure.

[0053] The lower magnetic structure 6 includes a lower magnetic yoke 22 and a lower inner axial magnetic ring 23 and a lower outer axial magnetic ring 21 mounted on the top of the lower magnetic yoke 22.

[0054] The lower inner axial magnetic ring 23 and the lower outer axial magnetic ring 21 are sequentially sleeved on the outer side of the inner magnetic yoke 12 from the inside to the outside.

[0055] The outer magnetic structure is set on the outside of the inner magnetic structure.

[0056] The outer magnetic structure 5 includes an outer magnetic yoke 16 and an outer upper radial magnetic ring 13, an outer central axial magnetic ring 17, and an outer lower radial magnetic ring 18, which are coaxially arranged inside the outer magnetic yoke 16 from top to bottom.

[0057] The inner magnetic structure includes an inner magnetic yoke 12 and three inner upper radial magnetic rings 26, inner central axial magnetic rings 25, and inner lower radial magnetic rings 24, which are coaxially mounted outside the inner magnetic yoke 12 from top to bottom.

[0058] The outer upper radial magnetic ring 13 and the inner upper radial magnetic ring 26, the outer central axial magnetic ring 17 and the inner central axial magnetic ring 25, and the outer lower radial magnetic ring 18 and the inner lower radial magnetic ring 24 are respectively arranged radially.

[0059] The bottom ends of the outer magnetic yoke 16 and the inner magnetic yoke 12 are both fixedly connected to the lower magnetic yoke 22.

[0060] The upper magnetic structure 4 includes an upper magnetic yoke 10 and an upper axial magnetic ring 11 located at the bottom end of the upper magnetic yoke 10.

[0061] The top ends of the outer magnetic yoke 16 and the inner magnetic yoke 12 are both fixedly connected to the upper magnetic yoke 10.

[0062] The upper axial magnetic ring 11 is coaxially inserted between the upper part of the inner magnetic yoke 12 and the upper part of the outer magnetic yoke 16.

[0063] The top ends of the inner upper radial magnetic ring 26 and the outer upper radial magnetic ring 13 are both in contact with the bottom end of the upper axial magnetic ring 11.

[0064] The bottom end of the inner lower radial magnetic ring 24 contacts the top end of the lower inner axial magnetic ring 23, and the bottom end of the outer lower radial magnetic ring contacts the top end of the lower outer axial magnetic ring 21.

[0065] The stator coil structure is coaxially mounted in the air gap formed between the inner lower radial magnetic ring 24 and the outer lower radial magnetic ring 18.

[0066] The mover includes a mover coil structure.

[0067] The moving coil structure is located above the stator coil structure and is coaxially inserted into the air gap formed between the inner magnetic structure and the outer magnetic structure 5.

[0068] The outer magnetic yoke 16 is fixed to the lower magnetic yoke 22, the outer magnetic yoke 16 is fixed to the upper magnetic yoke 10, the inner magnetic yoke 12 is fixed to the lower magnetic yoke 22, and the inner magnetic yoke 12 is fixed to the upper magnetic yoke 10 by a number of screws.

[0069] The bottom end of the inner magnetic yoke 12 is located at the center of the lower magnetic yoke 22, and the top end of the inner magnetic yoke 12 is located at the center of the upper magnetic yoke 10.

[0070] The upper axial magnetic ring 11 is sandwiched between the bottom end face of the upper magnetic yoke 10 and the horizontal plane where the top end of the outer upper radial magnetic ring 13 and the top end of the inner upper radial magnetic ring 26 are located.

[0071] The large initial thrust electromagnetic actuation device of the present invention utilizes the magnetic flux loop formed by two small radial magnetized permanent magnet rings (i.e., the outer lower radial magnet ring 18 and the inner lower radial magnet ring 24) to increase the air gap magnetic field strength between the two large radial permanent magnet rings (i.e., the outer upper radial magnet ring 13 and the inner upper radial magnet ring 26) near the stator coil 19, thereby increasing the Ampere force on the mover coil 15.

[0072] The lower inner axial magnetic ring 23, the lower outer axial magnetic ring 21, the outer upper radial magnetic ring 13, the outer middle axial magnetic ring 17, the outer lower radial magnetic ring 18, the inner upper radial magnetic ring 26, the inner middle axial magnetic ring 25, the inner lower radial magnetic ring 24, and the upper axial magnetic ring 11 form a closed air gap and create a constant permanent magnet magnetic field in the air gap. The outer magnetic yoke 16, the upper magnetic yoke 10, the inner magnetic yoke 12, and the lower magnetic yoke 22 enclose the permanent magnet, reduce leakage magnetic field, and enhance the magnetic density of the air gap magnetic field.

[0073] The moving coil 15 and stator coil 19 are supplied with opposite currents, forming opposing electromagnetic fields. This increases the magnetic flux in the magnetic circuit. The moving coil 15 experiences both electromagnetic repulsion from the stator coil 19 and Ampere force from the permanent magnetic field. These two forces work together to increase the initial thrust. The electromagnetic field generated by the stator coil 19 raises the operating point of the two tall radial permanent magnet rings. Simultaneously, the electromagnetic field generated by the stator coil 19 is opposite in direction to that generated by the moving coil 15, suppressing armature reaction caused by the moving coil 15. This invention features a compact structure and high initial thrust, meeting the current practical needs of on-orbit space services. It is used for the separation of various types of spacecraft after on-orbit maintenance, ensuring that the spacecraft separates at a predetermined speed.

[0074] The stator also includes a stator frame, which comprises a base 7 and a plurality of stator support rods 8 fixedly mounted on the base 7. A lower magnetic yoke 22 is mounted on the plurality of stator support rods 8. In this design, each stator support rod 8 is connected to the base 7 by screws. The plurality of stator support rods 8 are preferably evenly distributed along the circumference of the base 7. The stator support rods 8 are made of hard aluminum alloy 2A12.

[0075] The stator coil structure is fixed to the base 7 by several lower support rods 9. Preferably, the lower support rods 9 are evenly distributed around the circumference of the base 7. Each lower support rod 9 is fixed to the stator coil structure by screws. The base 7 and the lower support rods 9 are both made of 2A12 hard aluminum alloy.

[0076] The mover also includes a top plate 1 and several upper support rods 2, wherein the upper support rods 2 are slidably inserted into the upper magnetic yoke 10 and the upper axial magnetic ring 11, and the mover coil frame 14 is fixedly mounted below the top plate 1 by the several upper support rods 2. In this design, the several upper support rods 2 are preferably evenly distributed circumferentially along the top plate 1. The top end of each upper support rod 2 is fixed to the top plate 1, and the bottom end of each upper support rod 2 is fixed to the mover coil frame 14 by screws. The number of upper support rods 2 is preferably four. The top plate 1 and the upper support rods 2 are both made of hard aluminum alloy 2A12. The upper axial magnetic ring has a circular plate structure with a central hole and several first circular holes. The top end of the inner magnetic yoke passes through the central hole and is fixed to the upper magnetic yoke. The several upper support rods pass through the corresponding first circular holes to achieve the connection between the mover coil structure and the top plate.

[0077] At least one upper support rod 2 is provided with a linear bearing 3 between it and the upper magnetic yoke 10. With this design, the linear bearing 3 is installed on the upper part of the upper magnetic yoke 10, and the upper support rod 2 cooperates with the linear bearing 3 to realize the linear motion of the mover.

[0078] The stator coil structure includes a stator coil frame 20 and a stator coil 19 disposed on the stator coil frame 20.

[0079] The stator coil frame 20 has a first annular groove machined along its circumference on its outer side. The stator coil 19 is glued into the first annular groove. The mover coil structure includes a mover coil frame 14 and a mover coil 15 disposed on the mover coil frame 14. The mover coil frame 14 has a second annular groove machined along its circumference on its outer side. The mover coil 15 is glued into the second annular groove. With this design, the stator coil 19 and the mover coil 15 are respectively fixed in the first annular groove and the second annular groove using epoxy resin glue.

[0080] Both the stator coil frame 20 and the mover coil frame 14 are made of polyimide, and the outer yoke 16, inner yoke 12, upper yoke 10 and lower yoke 22 are made of DT4C.

[0081] The materials of the lower inner axial magnetic ring 23, the lower outer axial magnetic ring 21, the outer upper radial magnetic ring 13, the outer middle axial magnetic ring 17, the outer lower radial magnetic ring 18, the inner upper radial magnetic ring 26, the inner middle axial magnetic ring 25, the inner lower radial magnetic ring 24, and the upper axial magnetic ring 11 are all neodymium iron boron N35 permanent magnet materials.

[0082] The magnetization directions of the lower inner axial magnetic ring 23, the lower outer axial magnetic ring 21, the outer upper radial magnetic ring 13, the outer middle axial magnetic ring 17, the outer lower radial magnetic ring 18, the inner upper radial magnetic ring 26, the inner middle axial magnetic ring 25, the inner lower radial magnetic ring 24, and the upper axial magnetic ring 11 are as follows: front S rear N, front N rear S, inner S outer N, front S rear N, inner N outer S, inner S outer N, front N rear S, inner N outer S, front S rear N. This magnetization direction is referred to as magnetization direction one. Different magnetization directions correspond to different directions of energization for the moving coil 15 and the stator coil 19. For example, the magnetization directions for the lower inner axial magnetic ring 23, lower outer axial magnetic ring 21, outer upper radial magnetic ring 13, outer middle axial magnetic ring 17, outer lower radial magnetic ring 18, inner upper radial magnetic ring 26, inner middle axial magnetic ring 25, inner lower radial magnetic ring 24, and upper axial magnetic ring 11 are as follows: front N rear S, front S rear N, inner N outer S, front N rear S, inner S outer N, inner N outer S, front S rear N, inner S outer N, and front N rear S. In this case, the direction of energization for the moving coil 15 and the stator coil 19 is opposite to that of magnetization direction one.

[0083] The lower magnetic yoke 22 has a circular plate-like structure with several through holes. Several lower support rods 9 pass through these through holes and are fixed to the stator coil frame 20. The outer side of the lower inner axial magnetic ring 23 has several first arc-shaped through slots along its circumference, and the inner side of the lower outer axial magnetic ring 21 has several second arc-shaped through slots along its circumference. The first and second arc-shaped through slots are arranged in a one-to-one correspondence to form second circular holes corresponding to the through holes on the lower magnetic yoke 22, facilitating the passage of the lower support rods 9.

[0084] Working principle:

[0085] The inner lower radial magnetic ring 24, outer lower radial magnetic ring 18, inner upper radial magnetic ring 26, outer upper radial magnetic ring 13, inner magnetic yoke 12, outer magnetic yoke 16, and air gap form a permanent magnet closed loop. The inner lower radial magnetic ring 24 and outer lower radial magnetic ring 18 enhance the air gap magnetic field strength near the stator coil 19 between the inner upper radial magnetic ring 26 and the outer upper radial magnetic ring 13. When the current flowing through the mover coil 15 is in the opposite direction to the current flowing through the stator coil 19, the resulting electromagnetic fields are in opposite directions, generating a repulsive force between them. After the mover coil 15 is energized, it is simultaneously thrust by the reverse electromagnetic field generated by the stator coil 19. The air gap magnetic field strength near the stator coil 19 between the inner upper radial magnetic ring 26 and the outer upper radial magnetic ring 13 increases the Ampere force experienced by the mover coil 15 in the air gap, increasing the initial thrust. After the mover coil 15 enters the middle of the air gap between the inner upper radial magnetic ring 26 and the outer upper radial magnetic ring 13, it receives a stable thrust, achieving smooth acceleration.

[0086] In this invention, three main permanent magnet closed loops and one auxiliary magnetic circuit are formed by two radial magnetic rings of unequal height and other axially magnetized magnetic rings, such as... Figure 9 As shown,

[0087] The permanent magnet closed loop is as follows: the magnetic flux starts from the N pole of the inner upper radial magnetic ring 26, passes through the air gap, the S pole of the outer upper radial magnetic ring 13, the N pole of the outer upper radial magnetic ring 13, the outer yoke 16, the upper yoke 10, the inner yoke 12, and finally returns to the S pole of the inner upper radial magnetic ring 26.

[0088] The second permanent magnet closed loop is as follows: the magnetic flux starts from the N pole of the inner upper radial magnetic ring 26, passes through the air gap, the S pole of the outer upper radial magnetic ring 13, the N pole of the outer upper radial magnetic ring 13, the outer yoke 16, the S pole of the outer lower radial magnetic ring 18, the N pole of the outer lower radial magnetic ring 18, the air gap, the S pole of the inner lower radial magnetic ring 24, the N pole of the inner lower radial magnetic ring 24, the inner yoke 12, and finally returns to the S pole of the inner upper radial magnetic ring 26.

[0089] The permanent magnet closed loop three is as follows: the magnetic flux starts from the N pole of the outer lower radial magnetic ring 18, passes through the air gap, the S pole of the inner lower radial magnetic ring 24, the N pole of the inner lower radial magnetic ring 24, the inner magnetic yoke 12, the lower magnetic yoke 22, the outer magnetic yoke 16, and finally returns to the S pole of the outer lower radial magnetic ring 18.

[0090] The auxiliary magnetic circuit is as follows: the magnetic flux starts from the N pole of the lower inner axial magnetic ring 23, passes through the lower magnetic yoke 22, the S pole of the lower outer axial magnetic ring 21, the N pole of the lower outer axial magnetic ring 21, the outer lower radial magnetic ring 18, the air gap, the inner lower radial magnetic ring 24, and finally returns to the S pole of the lower inner axial magnetic ring 23.

[0091] The magnetic fields generated by the upper axial magnetic ring 11, the outer central axial magnetic ring 17, and the inner central axial magnetic ring 25 are used to improve the magnetic field distribution in the air gap and reduce magnetic leakage.

[0092] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A large initial thrust electromagnetic actuation device with multiple magnetic field hybrid action, characterized in that: Including stator and mover, The stator includes an outer magnetic structure (5), an inner magnetic structure, an upper magnetic structure (4), a lower magnetic structure (6), and a stator coil structure. The lower magnetic structure (6) includes a lower magnetic yoke (22) and a lower inner axial magnetic ring (23) and a lower outer axial magnetic ring (21) mounted on the top of the lower magnetic yoke (22). The lower inner axial magnetic ring (23) and the lower outer axial magnetic ring (21) are sequentially sleeved on the outer side of the inner magnetic yoke (12) from the inside to the outside. The outer magnetic structure (5) is fitted onto the outside of the inner magnetic structure. The outer magnetic structure (5) includes an outer magnetic yoke (16) and an outer upper radial magnetic ring (13), an outer central axial magnetic ring (17) and an outer lower radial magnetic ring (18) that are coaxially installed inside the outer magnetic yoke (16) from top to bottom. The inner magnetic structure includes an inner magnetic yoke (12) and an inner upper radial magnetic ring (26), an inner central axial magnetic ring (25) and an inner lower radial magnetic ring (24) that are coaxially fitted outside the inner magnetic yoke (12) from top to bottom. The outer upper radial magnetic ring (13) and the inner upper radial magnetic ring (26), the outer central axial magnetic ring (17) and the inner central axial magnetic ring (25), and the outer lower radial magnetic ring (18) and the inner lower radial magnetic ring (24) are arranged radially respectively. The bottom ends of the outer magnetic yoke (16) and the inner magnetic yoke (12) are both fixedly connected to the lower magnetic yoke (22). The upper magnetic structure (4) includes an upper magnetic yoke (10) and an upper axial magnetic ring (11) located at the bottom end of the upper magnetic yoke (10). The top ends of the outer magnetic yoke (16) and the inner magnetic yoke (12) are both fixedly connected to the upper magnetic yoke (10). The upper axial magnetic ring (11) is coaxially inserted between the upper part of the inner magnetic yoke (12) and the upper part of the outer magnetic yoke (16). The top ends of the inner upper radial magnetic ring (26) and the outer upper radial magnetic ring (13) are both in contact with the bottom end of the upper axial magnetic ring (11). The bottom end of the inner lower radial magnetic ring (24) contacts the top end of the lower inner axial magnetic ring (23), and the bottom end of the outer lower radial magnetic ring contacts the top end of the lower outer axial magnetic ring (21). The stator coil structure is coaxially mounted in the air gap formed between the inner lower radial magnetic ring (24) and the outer lower radial magnetic ring (18). The mover includes a mover coil structure. The moving coil structure is located above the stator coil structure and is coaxially inserted into the air gap formed between the inner magnetic structure and the outer magnetic structure (5); The magnetization directions of the lower inner axial magnetic ring (23), lower outer axial magnetic ring (21), outer upper radial magnetic ring (13), outer middle axial magnetic ring (17), outer lower radial magnetic ring (18), inner upper radial magnetic ring (26), inner middle axial magnetic ring (25), inner lower radial magnetic ring (24) and upper axial magnetic ring (11) are as follows: front S rear N, front N rear S, inner S outer N, front S rear N, inner N outer S, inner S outer N, front N rear S, inner N outer S, front S rear N; By utilizing the magnetic flux loop formed by two small outer lower radial magnetic rings and an inner lower radial magnetic ring, the air gap magnetic field strength between the two large outer upper radial magnetic rings and the inner upper radial magnetic ring near the stator coil is increased. When the current flowing through the moving coil (15) is in the opposite direction to the current flowing through the stator coil (19), the electromagnetic fields generated are in opposite directions.

2. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The stator also includes a stator frame, which includes a base (7) and several stator support rods (8) fixed on the base (7). The lower magnetic yoke (22) is mounted on the several stator support rods (8).

3. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The stator coil structure is fixed to the base (7) by several lower support rods (9).

4. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The mover also includes a top plate (1) and several upper support rods (2), wherein the several upper support rods (2) are slidably inserted into the upper magnetic yoke (10) and the upper axial magnetic ring (11), and the mover coil frame (14) is fixedly mounted below the top plate (1) by the several upper support rods (2).

5. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 4, characterized in that: At least one upper support rod (2) is provided with a linear bearing (3) between it and the upper magnetic yoke (10).

6. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The stator coil structure includes a stator coil frame (20) and a stator coil (19). A first annular groove is machined on the outer side of the stator coil frame (20) along its circumference. The stator coil (19) is installed in the first annular groove. The mover coil structure includes a mover coil frame (14) and a mover coil (15). A second annular groove is machined on the outer side of the mover coil frame (14) along its circumference. The mover coil (15) is installed in the second annular groove.

7. The electromagnetic actuation device for large initial thrust with multiple magnetic field hybrid action according to claim 1, characterized in that: The stator coil bobbin (20) and the mover coil bobbin (14) are both made of polyimide, and the outer yoke (16), inner yoke (12), upper yoke (10) and lower yoke (22) are all made of DT4C.

8. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The materials of the lower inner axial magnetic ring (23), the lower outer axial magnetic ring (21), the outer upper radial magnetic ring (13), the outer middle axial magnetic ring (17), the outer lower radial magnetic ring (18), the inner upper radial magnetic ring (26), the inner middle axial magnetic ring (25), the inner lower radial magnetic ring (24), and the upper axial magnetic ring (11) are all neodymium iron boron N35 permanent magnet materials.

9. The electromagnetic actuation device with large initial thrust through multi-magnetic field hybrid action according to claim 1, characterized in that: The lower magnetic yoke (22) has a circular plate structure. Several through holes are provided on the lower magnetic yoke (22), and several lower support rods (9) pass through the several through holes and are fixed to the stator coil frame (20).

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