Electromagnetic actuator for increasing initial thrust with electromagnetic assistance

Abstract

The electromagnetic actuator device for increasing initial thrust with electromagnetic assistance belongs to the technical field of aerospace. The present application solves the problem that the existing electromagnetic actuator has small initial thrust, which 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 yoke and a stator coil structure, the outer magnetic structure is sleeved outside the inner magnetic structure, the mover comprises a mover coil structure, the mover coil structure comprises a mover coil framework and a mover coil arranged on the mover coil framework. The stator coil is given opposite current to the mover coil, the strong electromagnetic field generated is opposite to the electromagnetic field generated by the mover coil, and the electromagnetic field generated by the stator coil generates strong thrust on the mover coil structure at the moment of electrification. On the basis of the ampere force suffered by the original coil in the permanent magnetic field, a large electromagnetic repulsive force is additionally suffered, the initial thrust suffered by the mover coil structure is increased, and the target spacecraft separates at a predetermined speed.

Description

TECHNICAL FIELD

[0001] The application relates to an electromagnetic actuator with electromagnetic auxiliary increase of initial thrust, and belongs to the technical field of aerospace. BACKGROUND

[0002] With the development of space technology and the continuous exploration of space, a large number of spacecraft are currently operating in orbit, and a part of them have reached the service life, exhausted fuel or damaged parts and become space garbage. However, through space service measures such as in-orbit maintenance or replacement of parts, refueling or change of service orbit, the service life of the spacecraft can be extended, and the application cost of the spacecraft can be reduced.

[0003] Facing the in-orbit service task of the spacecraft, the service spacecraft needs to dock with the target spacecraft to realize fuel refueling and maintenance service. After completing the service task, the service spacecraft needs to separate the target spacecraft again to make it return to the working orbit, which requires a reusable spacecraft separation device and the separation speed of which can be adjusted for different types of spacecraft. The double magnetic circuit electromagnetic actuator with compensation magnetic steel described in patent CN113572334B uses the front and rear double permanent magnetic branch circuits formed on the single layer magnetic pole structure to realize permanent magnetic flux shunting, relieve the magnetic yoke magnetic saturation and reduce the thickness of the magnetic yoke. At the same time, the compensation magnetic steel located at the front and rear ends increases the magnetic motive force in the front and rear permanent magnetic branch circuits, increases the air gap magnetic field strength and thrust density. The electromagnetic actuator for nano satellite deployment device described in patent CN113443176B uses multiple magnetic ring series to form a single closed permanent magnetic circuit to increase the inner and outer air gap magnetic field strength. The electromagnetic actuator with redundant air gap described in patent CN113562203B uses a magnetic isolation ring to play the role of redundant air gap, effectively relieves the local magnetic saturation, forms an auxiliary permanent magnetic circuit, increases the end air gap magnetic density and makes the magnetic field distribution uniform. The single layer magnetic pole electromagnetic actuator with double windings described in patent CN113572335B uses a guide magnetic ring to solve the problem of magnetic field cancellation caused by opposite magnetic circuits, realizes the guidance of different branch magnetic flux, reduces the magnetic leakage and improves the air gap magnetic field.

[0004] However, the current electromagnetic actuators all have small initial thrust, and in certain cases, the spacecraft needs a larger initial thrust to realize separation. Therefore, in order to meet the task demand of separating the spacecraft after completing the in-orbit service, an electromagnetic actuator with larger initial thrust is urgently needed. SUMMARY

[0005] The application is to solve the problem that the existing electromagnetic actuator has small initial thrust and the spacecraft cannot separate at the predetermined speed, and further provides an electromagnetic actuator with electromagnetic auxiliary increase of initial thrust.

[0006] The application adopts the technical scheme that

[0007] An electromagnetic actuator for increasing initial thrust by electromagnetic assistance, comprising a stator and a mover,

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

[0009] The outer magnetic structure is sleeved outside the inner magnetic structure,

[0010] The outer magnetic structure comprises an outer magnetic yoke and an outer radial magnetic ring coaxially sleeved inside the outer magnetic yoke,

[0011] The inner magnetic structure comprises an inner magnetic yoke and an inner radial magnetic ring coaxially sleeved outside the inner magnetic yoke,

[0012] The bottom end of the outer magnetic yoke and the bottom end of the inner magnetic yoke are fixedly connected with the lower magnetic yoke,

[0013] The upper magnetic structure comprises an upper magnetic yoke and an upper axial magnetic ring located at the bottom end of the upper magnetic yoke,

[0014] The top end of the outer magnetic yoke and the top end of the inner magnetic yoke are fixedly connected with the upper magnetic yoke,

[0015] The upper axial magnetic ring is coaxially sleeved between the upper part of the inner magnetic yoke and the upper part of the outer magnetic yoke,

[0016] The inner side surface of the outer magnetic yoke below the outer radial magnetic ring is processed with a first annular protrusion along the circumference thereof, and the inner side surface of the inner magnetic yoke below the inner radial magnetic ring is processed with a second annular protrusion along the circumference thereof,

[0017] The stator coil structure is coaxially sleeved in a first air gap formed between the first annular protrusion and the second annular protrusion,

[0018] The mover comprises a mover coil structure,

[0019] The mover coil structure is coaxially sleeved in a second air gap formed between the inner radial magnetic ring and the outer radial magnetic ring.

[0020] Further, the stator further comprises a stator frame, the stator frame comprises a base and a plurality of stator support rods fixedly connected to the base, and the lower magnetic yoke is installed on the plurality of stator support rods.

[0021] Further, the stator coil structure is fixedly connected to the base through the plurality of lower support rods.

[0022] Further, the mover further comprises a top plate and a plurality of upper support rods, the plurality of upper support rods are slidably inserted into the upper magnetic yoke and the upper axial magnetic ring, and the mover coil structure is fixedly connected to the lower side of the top plate through the plurality of upper support rods.

[0023] Further, a linear bearing is arranged between the at least one upper supporting rod and the upper magnetic yoke.

[0024] Further, the stator coil structure comprises a stator coil framework and a stator coil arranged on the stator coil framework, and a first annular groove is processed on the outer side of the stator coil framework along the circumferential direction thereof, and the stator coil is arranged in the first annular groove; and the rotor coil structure comprises a rotor coil framework and a rotor coil arranged on the rotor coil framework, and a second annular groove is processed on the outer side of the rotor coil framework along the circumferential direction thereof, and the rotor coil is arranged in the second annular groove.

[0025] Further, the stator coil framework and the rotor coil framework are both made of polyimide material, and the outer magnetic yoke, the inner magnetic yoke, the upper magnetic yoke and the lower magnetic yoke are all made of DT4C.

[0026] Further, the materials of the outer radial magnetic ring, the inner radial magnetic ring and the upper axial magnetic ring are all made of a rare-earth iron-boron N35 permanent magnetic material, and the magnetization directions of the outer radial magnetic ring, the inner radial magnetic ring and the upper axial magnetic ring are S inside and N outside, S inside and N outside, and S in front and N in back, respectively.

[0027] Further, the lower magnetic yoke is in a convex-shaped disc structure, and a circular groove is arranged on the upper end of the lower magnetic yoke, and the bottom end of the inner magnetic yoke is inserted into the circular groove, and the bottom ends of the first annular protrusion and the second annular protrusion are arranged on the top end of the convex-shaped disc structure, and the bottom end of the outer magnetic yoke is arranged on the shoulder of the convex-shaped disc structure and is fixed by a plurality of screws.

[0028] Further, a plurality of through holes are arranged on the upper end of the lower magnetic yoke and are distributed on the outer side of the circular groove along the circumferential direction.

[0029] Compared with the prior art, the present application has the following effects:

[0030] In the present application, the inner radial magnetic ring and the outer radial magnetic ring arranged inside and outside (i.e. the double-layer radial magnetization permanent magnetic ring) form a magnetic flux uniform air gap, and the upper axial magnetic ring (i.e. the permanent magnet ring) arranged on the top end and having different magnetization directions forms a local magnetic circuit, thereby enhancing the end magnetic field strength and reducing the end magnetic leakage.

[0031] The inner side of the outer magnetic yoke under the outer radial magnetic ring is machined with a first annular protrusion along the circumference thereof, the inner side of the inner magnetic yoke under the inner radial magnetic ring is machined with a second annular protrusion along the circumference thereof, the stator coil structure is coaxially arranged in the first air gap formed between the first annular protrusion and the second annular protrusion, namely, the diameters of the inner magnetic yoke and the outer magnetic yoke are increased in the part corresponding to the stator coil structure, which is equivalent to arranging large-diameter magnetic conductors on the inner side and the outer side of the stator coil, thereby enhancing the electromagnetic field generated by the stator coil in the stator coil structure, the generated electromagnetic field magnetic flux loop increases the magnetic field strength of the second air gap, and the ampere force suffered by the mover coil structure in the mover coil structure is increased. The mover coil is initially located at the lower end of the second air gap, the stator coil is supplied with a current opposite to the mover coil, the strong electromagnetic field generated by the stator coil is opposite to the electromagnetic field generated by the mover coil, and the electromagnetic field generated by the stator coil generates a strong thrust on the mover coil structure at the moment of energization. On the basis of the ampere force suffered by the original coil in the permanent magnetic field, the initial thrust suffered by the mover coil structure is increased, so that the target spacecraft is separated at a predetermined speed.

[0032] The stator coil is energized and cooperates with the inner magnetic yoke with the second annular protrusion, which is equivalent to adding an electromagnet in the magnetic flux loop, thereby increasing the magnetic flux in the magnetic circuit and improving the working point of the outer radial magnetic ring and the inner radial magnetic ring.

[0033] The application has the characteristics of compact structure, large initial thrust and smooth running after starting, and can meet the actual needs of on-orbit space service at the present stage. It is used for separating multiple types of spacecraft after on-orbit space maintenance, and can ensure that the spacecraft is separated at a predetermined speed. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a perspective structural schematic view of the electromagnetic actuator for increasing the initial thrust of the application;

[0035] Figure 2 It is a main sectional view of the electromagnetic actuator for increasing the initial thrust of the application;

[0036] Figure 3 It is a perspective structural schematic view of the mover in the electromagnetic actuator for increasing the initial thrust of the application;

[0037] Figure 4 It is a perspective structural schematic view of the outer magnetic structure in the electromagnetic actuator for increasing the initial thrust of the application;

[0038] Figure 5 It is a perspective structural schematic view of the inner magnetic structure in the electromagnetic actuator for increasing the initial thrust of the application;

[0039] Figure 6The schematic diagram of the three-dimensional structure of the upper magnetic structure in the electromagnetic actuator for increasing the initial thrust by electromagnetic assistance of the application;

[0040] Figure 7 The schematic diagram of the three-dimensional structure of the lower magnetic yoke in the electromagnetic actuator for increasing the initial thrust by electromagnetic assistance of the application;

[0041] Figure 8 The schematic diagram of the connection structure between the stator coil structure and the stator frame in the electromagnetic actuator for increasing the initial thrust by electromagnetic assistance of the application;

[0042] Figure 9 The schematic diagram of the magnetic flux loop in the electromagnetic actuator for increasing the initial thrust by electromagnetic assistance of the application.

[0043] In the figure:

[0044] 1, top plate; 2, upper support rod; 3, linear bearing; 4, upper magnetic structure; 5, outer magnetic structure; 6, lower magnetic yoke; 6-1, circular groove; 6-2, through hole; 7, base; 8, stator support rod; 9, lower support rod; 10, upper magnetic yoke; 11, upper axial magnetic ring; 12, inner magnetic yoke; 13, outer radial magnetic ring; 14, mover coil skeleton; 15, mover coil; 16, outer magnetic yoke; 17, inner radial magnetic ring; 18, stator coil; 19, stator coil skeleton. DETAILED DESCRIPTION

[0045] Specific implementation one: combined Figures 1-9 It is obvious that the described embodiments are only part of the embodiments of the application, but not all the embodiments. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0046] It should be noted that the descriptions of the application with respect to "front", "rear", "left", "right", "inner", "outer", "left side", "right side", "upper", "lower", "top", "bottom" and the like are defined based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0047] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] An electromagnetic actuator for assisting in increasing initial thrust, comprising a stator and a mover,

[0049] The stator comprises an outer magnetic structure 5, an inner magnetic structure, an upper magnetic structure 4, a lower magnetic yoke 6 and a stator coil structure,

[0050] The outer magnetic structure 5 is sleeved on the outside of the inner magnetic structure,

[0051] The outer magnetic structure 5 comprises an outer magnetic yoke 16 and an outer radial magnetic ring 13 coaxially arranged inside the outer magnetic yoke 16,

[0052] The inner magnetic structure comprises an inner magnetic yoke 12 and an inner radial magnetic ring 17 coaxially sleeved outside the inner magnetic yoke 12,

[0053] The bottom end of the outer magnetic yoke 16 and the bottom end of the inner magnetic yoke 12 are fixedly connected with the lower magnetic yoke 6,

[0054] The upper magnetic structure 4 comprises an upper magnetic yoke 10 and an upper axial magnetic ring 11 located at the bottom end of the upper magnetic yoke 10,

[0055] The top end of the outer magnetic yoke 16 and the top end of the inner magnetic yoke 12 are fixedly connected with the upper magnetic yoke 10,

[0056] The upper axial magnetic ring 11 is coaxially arranged between the upper part of the inner magnetic yoke 12 and the upper part of the outer magnetic yoke 16,

[0057] The inner side of the outer magnetic yoke 16 below the outer radial magnetic ring 13 is machined with a first annular protrusion along its circumference, and the inner side of the inner magnetic yoke 12 below the inner radial magnetic ring 17 is machined with a second annular protrusion along its circumference,

[0058] The stator coil structure is coaxially arranged in the first air gap formed between the first annular protrusion and the second annular protrusion,

[0059] The mover comprises a mover coil structure,

[0060] The mover coil structure is coaxially arranged in the second air gap formed between the inner radial magnetic ring 17 and the outer radial magnetic ring 13.

[0061] The outer magnetic yoke 16 and the lower magnetic yoke 6, the outer magnetic yoke 16 and the upper magnetic yoke 10, the inner magnetic yoke 12 and the lower magnetic yoke 6, and the inner magnetic yoke 12 and the upper magnetic yoke 10 are fixedly connected by a plurality of screws.

[0062] The lower end of the inner magnetic yoke 12 is located at the center of the lower magnetic yoke 6, and the top end of the inner magnetic yoke 12 is located at the center of the upper magnetic yoke 10.

[0063] The upper axial magnetic ring 11 is clamped between the bottom end surface of the upper magnetic yoke 10 and the horizontal plane where the top end of the outer radial magnetic ring 13 and the top end of the inner radial magnetic ring 17 are located.

[0064] The mover coil skeleton 14 is located between the radial outer side of the inner magnetic structure and the radial inner side of the outer magnetic structure 5 in the air gap.

[0065] The materials of the outer radial magnetic ring 13, the inner radial magnetic ring 17 and the upper axial magnetic ring 11 are all N35 permanent magnetic materials of rare earth iron boron.

[0066] In the present application, the inner radial magnetic ring 17 and the outer radial magnetic ring 13 arranged inside and outside (i.e. double-layer radial magnetized permanent magnetic ring) form a magnetic flux uniform air gap, and the upper axial magnetic ring 11 (i.e. permanent magnet ring) arranged at the top end with different magnetization directions forms a local magnetic circuit, which enhances the end magnetic field strength and reduces the end magnetic leakage.

[0067] The inner side surface of the outer magnetic yoke 16 located below the outer radial magnetic ring 13 is processed with a first annular protrusion along the circumference thereof, the inner side surface of the inner magnetic yoke 12 located below the inner radial magnetic ring 17 is processed with a second annular protrusion along the circumference thereof, and the stator coil structure is coaxially arranged in the first air gap formed between the first annular protrusion and the second annular protrusion, that is, the diameters of the inner magnetic yoke 12 and the outer magnetic yoke 16 are increased in the part corresponding to the stator coil structure, which is equivalent to arranging large-diameter magnetic conductors on the inner side and the outer side of the stator coil 18, thereby enhancing the electromagnetic field generated by the stator coil structure, and the electromagnetic field magnetic flux loop increases the magnetic field strength of the second air gap, thereby increasing the ampere force received by the mover coil 15. The stator coil 18 is initially located at the lower end of the second air gap, and the opposite current is passed through the stator coil 18 and the mover coil 15, the strong electromagnetic field generated in the opposite direction of the electromagnetic field generated by the mover coil 15, and the strong thrust is generated by the electromagnetic field generated by the stator coil 18 to the mover coil structure at the moment of energization. On the basis of the ampere force received by the original coil in the permanent magnetic field, the initial thrust received by the mover coil structure is increased by a large electromagnetic repulsive force, so that the target spacecraft is separated at a predetermined speed.

[0068] After the stator coil 18 is energized, the inner magnetic yoke 12 with the second annular protrusion acts together, which is equivalent to adding an electromagnet in the magnetic flux loop, thereby increasing the magnetic flux in the magnetic circuit and improving the working point of the outer radial magnetic ring 13 and the inner radial magnetic ring 17.

[0069] The application has the characteristics of compact structure, large initial thrust and smooth operation after starting, and can meet the actual needs of on-orbit space services at the present stage. It is used for separating multiple types of spacecraft after on-orbit space maintenance, and can ensure that the spacecraft separates at a predetermined speed.

[0070] The stator further comprises a stator frame, which comprises a base 7 and a plurality of stator support rods 8 fixed on the base 7, and the lower magnetic yoke 6 is installed on the plurality of stator support rods 8. In this design, each of the stator support rods 8 is connected to the base 7 by screws. The plurality of stator support rods 8 are preferably evenly distributed circumferentially along the base 7. The material of the stator support rods 8 is hard aluminum alloy 2A12.

[0071] The stator coil structure is fixed on the base 7 by a plurality of lower support rods 9. In this design, the plurality of lower support rods 9 are preferably evenly distributed circumferentially along the base 7. Each lower support rod 9 is fixed to the stator coil skeleton 19 by screws. The materials of the base 7 and the lower support rods 9 are both hard aluminum alloy 2A12.

[0072] The mover further comprises a top plate 1 and a plurality of upper support rods 2, wherein the plurality of upper support rods 2 are slidably inserted into the upper magnetic yoke 10 and the upper axial magnetic ring 11, and the mover coil structure is fixed below the top plate 1 by the plurality of upper support rods 2. In this design, the plurality of 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 by screws, and the bottom end of each upper support rod 2 is fixed to the mover coil skeleton 14 by screws. The number of upper support rods 2 is preferably four. The materials of the top plate 1 and the upper support rods 2 are both hard aluminum alloy 2A12.

[0073] A linear bearing 3 is arranged between at least one upper support rod 2 and the upper magnetic yoke 10. In 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.

[0074] The stator coil structure comprises a stator coil skeleton 19 and a stator coil 18 arranged on the stator coil skeleton 19,

[0075] The outer side of the stator coil skeleton 19 is processed with a first annular groove in the circumferential direction thereof, and the stator coil 18 is glued in the first annular groove. The mover coil structure comprises a mover coil skeleton 14 and a mover coil 15 arranged on the mover coil skeleton 14, and the outer side of the mover coil skeleton 14 is processed with a second annular groove in the circumferential direction thereof, and the mover coil 15 is glued in the second annular groove. In this design, the stator coil 18 and the mover coil 15 are respectively fixed in the first annular groove and the second annular groove by corresponding epoxy resin glue.

[0076] The stator coil bobbin 19 and the mover coil bobbin 14 are both made of polyimide material, and the outer magnetic yoke 16 , the inner magnetic yoke 12 , the upper magnetic yoke 10 and the lower magnetic yoke 6 are all made of DT4C.

[0077] The outer radial magnetic ring 13, the inner radial magnetic ring 17 and the upper axial magnetic ring 11 are all made of NdFeB N35 permanent magnet material, and the magnetization directions of the outer radial magnetic ring 13, the inner radial magnetic ring 17 and the upper axial magnetic ring 11 are: inner S outer N, inner S outer N, front S and back N.

[0078] The lower magnetic yoke 6 is a convex disc structure with a circular groove 6-1 located at the center of the top of the convex disc structure. The bottom end of the inner magnetic yoke 12 is inserted into the circular groove 6-1. The bottom ends of the first and second annular protrusions are both placed on the top of the convex disc structure. The bottom end of the outer magnetic yoke 16 is placed on the shoulder of the convex disc structure and secured by several screws. This design radially limits the inner magnetic yoke 12 via the circular groove 6-1, and the two are secured by several screws. The shoulder structure also radially limits the outer magnetic yoke 16.

[0079] The lower yoke 6 is further provided with a plurality of through holes 6-2, and the plurality of through holes 6-2 are distributed circumferentially outside the circular groove 6-1. With such a design, the plurality of lower support rods 9 and the plurality of stator support rods 8 are correspondingly passed through the plurality of through holes 6-2.

[0080] Working principle:

[0081] The outer radial magnetic ring 13, inner radial magnetic ring 17, and upper axial magnetic ring 11 form a closed air gap, generating a constant permanent magnetic field within the air gap. The outer magnetic yoke 16, upper magnetic yoke 10, inner magnetic yoke 12, and lower magnetic yoke 6 enclose the permanent magnets, reducing magnetic flux leakage and enhancing the magnetic field density in the air gap. When current flows through the stator coil 18, the portion of the inner magnetic yoke 12 enclosed by the stator coil 18 acts as a magnet. This increases the magnetic field strength in the air gap between the inner radial magnetic ring 17 and the outer radial magnetic ring 13, near the stator coil 18, in the magnetic circuit. This increases the Ampere force between the inner radial magnetic ring 17 and the outer radial magnetic ring 13 when power is applied to the mover coil 15. The current flowing through the mover coil 15 is opposite to that flowing through the stator coil 18, generating an electromagnetic field in the opposite direction. The stator coil 18 exerts a repulsive force on the mover coil 15. These two forces work together to increase the initial thrust of the mover coil 15.

[0082] The two layers of radial magnetized magnetic rings in the present invention, namely the outer radial magnetic ring 13 and the inner radial magnetic ring 17, form two main magnetic flux closed loops and an electromagnetic field magnetic flux loop, such as Figure 9 As shown,

[0083] The magnetic flux closed loop one is: the magnetic flux starts from the N pole of the inner radial magnetic ring 17, passes through the second air gap, the S pole of the outer radial magnetic ring 13, the N pole of the outer radial magnetic ring 13, the outer magnetic yoke 16, the upper magnetic yoke 10 and the inner magnetic yoke 12 in turn, and finally returns to the S pole of the inner radial magnetic ring 17.

[0084] The magnetic flux closed loop two is: the magnetic flux starts from the N pole of the inner radial magnetic ring 17, passes through the second air gap, the S pole of the outer radial magnetic ring 13, the N pole of the outer radial magnetic ring 13, the outer magnetic yoke 16, the lower magnetic yoke 6 and the inner magnetic yoke 12 in turn, and finally returns to the S pole of the inner radial magnetic ring 17.

[0085] The magnetic flux closed loop two is: the magnetic flux starts from the N pole of the inner radial magnetic ring 17, passes through the second air gap, the S pole of the outer radial magnetic ring 13, the N pole of the outer radial magnetic ring 13, the outer magnetic yoke 16, the lower magnetic yoke 6 and the inner magnetic yoke 12 in turn, and finally returns to the S pole of the inner radial magnetic ring 17.

[0086] The magnetic flux generated by the upper axial magnetic ring 11 is used to improve the magnetic field distribution in the end air gap and reduce the magnetic flux leakage.

[0087] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An electromagnetic actuator for electromagnetic assisted increase of initial thrust, characterized by: The stator comprises a stator coil structure, The stator comprises an outer magnetic structure (5), an inner magnetic structure, an upper magnetic structure (4), a lower magnetic yoke (6), and a stator coil structure, The outer magnetic structure (5) is sleeved outside the inner magnetic structure, The outer magnetic structure (5) comprises an outer magnetic yoke (16) and an outer radial magnetic ring (13) coaxially sleeved inside the outer magnetic yoke (16), The inner magnetic structure comprises an inner magnetic yoke (12) and an inner radial magnetic ring (17) coaxially sleeved outside the inner magnetic yoke (12), The bottom end of the outer magnetic yoke (16) and the bottom end of the inner magnetic yoke (12) are fixedly connected with the lower magnetic yoke (6), The upper magnetic structure (4) comprises 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 end of the outer magnetic yoke (16) and the top end of the inner magnetic yoke (12) are fixedly connected with the upper magnetic yoke (10), The upper axial magnetic ring (11) is coaxially sleeved between the upper portion of the inner magnetic yoke (12) and the upper portion of the outer magnetic yoke (16), The inner side of the outer magnetic yoke (16) below the outer radial magnetic ring (13) is processed with a first annular protrusion along the circumference thereof, and the inner side of the inner magnetic yoke (12) below the inner radial magnetic ring (17) is processed with a second annular protrusion along the circumference thereof, The stator coil structure is coaxially sleeved in a first air gap formed between the first annular protrusion and the second annular protrusion, The mover comprises a mover coil structure, The mover coil structure is coaxially sleeved in a second air gap formed between the inner radial magnetic ring (17) and the outer radial magnetic ring (13).

2. The electromagnetic actuator of claim 1, wherein: The stator further comprises a stator frame, and the stator frame comprises a base (7) and a plurality of stator support rods (8) fixedly connected to the base (7), and the lower magnetic yoke (6) is mounted on the plurality of stator support rods (8).

3. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to increase the initial force by a factor of 1.5 to 2.

0. The stator coil structure is fixedly connected to the base (7) through a plurality of lower support rods (9).

4. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to increase the initial force by a factor of 1.5 to 2.

0. The mover further comprises a top plate (1) and a plurality of upper support rods (2), wherein the plurality of upper support rods (2) are slidably inserted into the upper magnetic yoke (10) and the upper axial magnetic ring (11), and the mover coil framework (14) is fixedly connected below the top plate (1) through the plurality of upper support rods (2).

5. The electromagnetic actuator of claim 4, wherein: the electromagnetic actuator is configured to provide an electromagnetic force to the piston to increase the initial force applied to the piston by the piston spring. A linear bearing (3) is arranged between at least one upper support rod (2) and the upper magnetic yoke (10).

6. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to provide an electromagnetic force to the piston to increase the initial force applied to the piston by the piston spring. The stator coil structure comprises a stator coil framework (19) and a stator coil (18), the outer side of the stator coil framework (19) is processed with a first annular groove along the circumference thereof, and the stator coil (18) is mounted in the first annular groove, and the mover coil structure comprises a mover coil framework (14) and a mover coil (15) arranged on the mover coil framework (14), the outer side of the mover coil framework (14) is processed with a second annular groove along the circumference thereof, and the mover coil (15) is mounted in the second annular groove.

7. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to provide an electromagnetic force to increase the initial force. The stator coil framework (19) and the mover coil framework (14) are both made of polyimide material, and the outer magnetic yoke (16), the inner magnetic yoke (12), the upper magnetic yoke (10), and the lower magnetic yoke (6) are all made of DT4C.

8. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to provide an electromagnetic force to increase the initial force. The material of the outer radial magnetic ring (13), the inner radial magnetic ring (17) and the upper axial magnetic ring (11) is a Nd-Fe-B N35 permanent magnetic material, and the magnetization directions of the outer radial magnetic ring (13), the inner radial magnetic ring (17) and the upper axial magnetic ring (11) are sequentially: inner S and outer N, inner S and outer N, front S and rear N.

9. The electromagnetic actuator of claim 1, wherein: the electromagnetic actuator is configured to provide an electromagnetic force to increase the initial force. The lower magnetic yoke (6) is in a convex disc structure, a circular groove (6-1) is arranged on the upper surface of the lower magnetic yoke (6), the circular groove (6-1) is located at the center of the top end of the convex disc structure, the bottom end of the inner magnetic yoke (12) is inserted into the circular groove (6-1), the bottom end of the first annular protrusion and the bottom end of the second annular protrusion are arranged on the top end of the convex disc structure, and the bottom end of the outer magnetic yoke (16) is arranged on the shoulder of the convex disc structure and is fixed by a plurality of screws.

10. The electromagnetic actuator of claim 9, wherein: the electromagnetic actuator is configured to provide an electromagnetic force of at least 100 N. A plurality of through holes (6-2) are further arranged on the lower magnetic yoke (6), and the plurality of through holes (6-2) are distributed on the outer side of the circular groove (6-1) in the circumferential direction.

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