CN115296503A - Guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator - Google Patents
Guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator Download PDFInfo
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Abstract
The invention relates to the technical field of vibration measurement, in particular to a guide and drive combined permanent magnet centripetal excitation cylindrical electromagnetic actuator, which comprises an electromagnetic drive part and a moving part, wherein the electromagnetic drive part is connected with the moving part through a bearing; the electromagnetic driving part comprises a cylindrical lower magnetic yoke and an annular permanent magnet arranged on the inner side of the lower magnetic yoke; the inner side of the lower magnetic yoke and the inner side and the lower side of the permanent magnet enclose to form a motion cavity; a central magnetic yoke is arranged on the lower magnetic yoke and positioned inside the motion cavity; an air gap is arranged between the central magnetic yoke and the permanent magnet; the moving part comprises a working table top positioned on the upper side of the central magnetic yoke, a coil framework is arranged on one side surface of the working table top close to the central magnetic yoke, and the coil framework is sleeved on the outer side of the central magnetic yoke in a sliding manner; the outer side wall of the coil framework is wound with a direct current coil and an exciting coil. By adopting the scheme, the assembly difficulty of the moving parts is reduced to the greatest extent, the self weight of the moving parts is reduced, and the assembly precision and the driving capability of the electromagnetic actuator are effectively improved.
Description
Technical Field
The invention relates to the technical field of vibration measurement, in particular to a guide and drive combined permanent magnet centripetal excitation cylindrical electromagnetic actuator.
Background
The electromagnetic actuator has a very wide application in the field of vibration, and is a core component of equipment such as an electromagnetic vibration table, a voice coil motor and the like. In recent years, the performance requirements of electromagnetic actuators are becoming higher and higher in relevant research in important fields such as aerospace, building bridges, earthquake prevention and disaster reduction and the like. The driving and guiding mechanisms of the traditional electromagnetic actuator are separated, errors are inevitably introduced during assembly, the distortion degree of electromagnetic driving waveforms is increased, and transverse vibration is generated on a moving part; meanwhile, the separated driving and guiding mechanism needs a larger moving part size, and the large moving part has larger mass, so that the electromagnetic driving capability can be weakened, and the miniaturization of equipment is not facilitated. Therefore, the key for improving the performance of the electromagnetic actuator is to realize high assembly precision and light weight of moving parts of the electromagnetic actuator by a simple and reliable design method.
Patent No. ZL201510236217.7 discloses a magnetic field tracking compensation cylindrical low-frequency vibration calibration table with a long permanent magnet tube centripetal excitation. The permanent magnet tube is coaxially assembled inside the long cylindrical outer yoke in a bonding mode to carry out excitation, the polarities of the magnetic poles on the inner surface of the permanent magnet tube are the same, a closed magnetic circuit is formed through the magnetic yoke, high-uniformity magnetic field distribution is generated in an air gap, the central magnetic yoke is uniformly wound with compensation coils, the influence of a compensation magnetic field on armature reaction is formed to carry out synchronous tracking compensation, and the motion guiding precision is ensured by adopting a static pressure air flotation guiding technology.
Patent No. CN201811332560.1 discloses a vibration table. A magnetic field is generated through a magnetic circuit device, and an air bearing is fixed on the periphery of a moving coil framework, so that transverse disturbance is reduced. The direct current coil and the exciting coil are radially wound on the outer peripheral wall of the movable coil framework, the direct current coil is positioned in the linear magnetic field region, and the movable coil is positioned at a position where direct current ampere force is equal to the gravity of the movable coil framework through direct current excitation so as to counteract the gravity and determine a zero position. The exciting coil is positioned in the uniform magnetic field region and is excited by alternating current to generate standard vibration.
The technical scheme has the remarkable characteristics that: the guide device is separated from the driving structure, the electromagnetic driving structure and the guide device are strictly ensured to be fixedly installed in an axial direction parallel to each other in the assembling process, the assembling precision is difficult to ensure, the vibration waveform is easy to distort, and transverse vibration is generated; an additional mechanical part is needed to connect a guide and drive mechanism, so that the miniaturization and lightweight design of a moving part are not facilitated, the load capacity of an electromagnetic actuator is seriously restricted, and the load capacity is particularly important for a low-frequency electromagnetic vibration table which is frequently calibrated by a large-scale vibration sensor; and patent CN201811332560.1 places the dc coil in a linear magnetic field region which is only approximately linear, and the nonlinearity of the dc coil can bring harmonic distortion to the vibration waveform.
In conclusion, the structure and principle innovation of the electromagnetic vibration calibration table provides the permanent magnet centripetal excitation cylindrical electromagnetic actuator with composite guiding and driving.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the guide and drive combined permanent magnet centripetal excitation cylindrical electromagnetic actuator, which greatly reduces the assembly difficulty of moving parts, reduces the self weight of the moving parts, and effectively improves the assembly precision and the driving capability of the electromagnetic actuator.
(II) technical scheme
In order to achieve the above object, the embodiment of the present application provides a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator, which includes an electromagnetic driving part and a moving part; the electromagnetic driving part comprises a cylindrical lower magnetic yoke and an annular permanent magnet arranged on the inner side of the lower magnetic yoke; the inner side of the lower magnetic yoke and the lower side of the permanent magnet enclose to form a motion cavity; a central magnetic yoke is arranged on the lower magnetic yoke and positioned in the motion cavity; an air gap is arranged between the central magnetic yoke and the permanent magnet; the moving part comprises a working table top positioned on the upper side of the central magnetic yoke, a coil framework is arranged on one side surface of the working table top close to the central magnetic yoke, and the coil framework is annular and is sleeved on the outer side of the central magnetic yoke in a sliding manner; the outer side wall of the coil framework is wound with a direct current coil and an exciting coil, and direct current with a fixed size is introduced into the direct current coil to generate an ampere force opposite to the gravity direction of the moving part; the exciting coil is electrified with controllable driving current to generate electromagnetic driving force.
Preferably, a static pressure air flotation structure is arranged on the coil framework and controls a static pressure air film to be formed between the coil framework and the central magnetic yoke.
Preferably, the static pressure air flotation structure comprises a cylindrical cavity type air chamber arranged in the coil framework, one side surface of the coil framework, which is close to the central magnetic yoke, is provided with air outlet holes, the air outlet holes are communicated with the air chamber, and the air outlet holes are uniformly distributed on the inner surface of the coil framework; the outer surface of the coil framework, which is far away from the central magnetic yoke, is provided with an air inlet hole, the air inlet hole is connected with the air chamber, and the air inlet hole is connected with an air supply source.
Preferably, the outer side surface of the permanent magnet abuts against the inner surface of the lower yoke; a mounting rack which is used for fixing the central magnetic yoke and supporting the permanent magnet is arranged in the motion cavity; the mounting frame is annular, and an annular mounting groove is formed in the mounting frame; a mounting hole is formed in the mounting rack and positioned at the bottom of the mounting groove; the inside wall butt of mounting bracket the center yoke goes up the side butt the permanent magnet, the downside of mounting bracket can be dismantled and connect lower yoke.
Preferably, a sliding guide or a rolling guide is disposed between the coil bobbin and the central yoke.
Preferably, the permanent magnet comprises one permanent magnet or a plurality of permanent magnets which are adhered to each other.
Preferably, the direct current coil and the exciting coil are positioned in the air gap and in the region with uniform magnetic field distribution; the dc coil and the exciting coil may be connected to each other.
Preferably, the fixed magnitude direct current is calculated by the following formula: i is DC = mg/(BL); in the formula, I DC The magnitude of the direct current passed through the direct current coil, m is the mass of the moving part and the related components fixed on the working table, g is the gravity acceleration, B is the average magnetic induction intensity distributed in the air gap, and L is the length of the direct current coil.
(III) advantageous effects
The invention provides a permanent magnet centripetal excitation cylindrical electromagnetic actuator with combined guiding and driving, which can realize the quick coaxial installation of a lower magnetic yoke, a permanent magnet and a central magnetic yoke through the arranged lower magnetic yoke, the permanent magnet, the central magnetic yoke and an installation assembly, and simultaneously, the assembly difficulty of moving parts is reduced to the greatest extent through the scheme of the integrated design of the arranged static pressure air flotation structure and the central magnetic yoke, the dead weight of the moving parts is reduced, and the assembly precision and the driving capability of the electromagnetic actuator can be effectively improved; in addition, the direct current coil is positioned in a uniform magnetic field distribution area, and interference is prevented from being introduced.
The method has the following specific beneficial effects:
(1) The permanent magnet centripetal excitation magnetic circuit structure adopted by the invention can generate stronger magnetic induction intensity in the air gap and is suitable for occasions with high requirements on electromagnetic driving force.
(2) According to the invention, the central magnetic yoke is processed into a guide shaft form, and the coil framework is made into a sliding mechanism, so that the design of the electromagnetic actuator integrating guidance and driving is completed, high assembly precision is realized, and the movement precision of the electromagnetic actuator is improved. The moving part is sleeved on a guide shaft formed by the central magnetic yoke as a sliding mechanism, and the integration of guiding and driving is realized through a static pressure air floating structure, a sliding guide rail form or a rolling guide rail form, so that the moving part and the electromagnetic driving structure are completely parallel in the axial direction, high assembly precision is achieved, transverse vibration caused by assembly errors is avoided, and the electromagnetic driving waveform precision is effectively improved.
(3) The invention realizes the miniaturization design target of the electromagnetic actuator and can obviously improve the load capacity of the electromagnetic actuator. The electromagnetic actuator integrating guiding and driving does not need an additional guiding mechanism, has a compact structure, is more miniaturized, and is beneficial to installation and transportation of equipment. No additional guide mechanism occupies extra space, the size of the moving part is greatly reduced, the light weight of the moving part is structurally realized, and the load capacity of the electromagnetic actuator is effectively improved.
(4) The invention can avoid the problem that the direct current coil is subjected to nonlinear electromagnetic force outside the air gap to generate vibration harmonic waves. The direct current coil is arranged in an air gap magnetic field distribution uniform area, direct current with fixed size is conducted to enable the direct current coil to be subjected to ampere force equal to the gravity of a moving part, active positive stiffness support is achieved by introducing superposed control quantity based on displacement feedback into the exciting coil, and harmonic interference caused by the fact that the direct current coil is subjected to nonlinear electromagnetic force outside an air gap is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator;
FIG. 2 is a cross-sectional view of a permanent magnet centripetal excitation cylindrical electromagnetic actuator with combined guiding and driving functions;
FIG. 3 is a cross-sectional view of a protruding mounting bracket in a cylindrical electromagnetic actuator with centripetal excitation of permanent magnets combined with guiding and driving;
FIG. 4 is a schematic view of a protruding mounting rack in a permanent magnet centripetal excitation cylindrical electromagnetic actuator with combined guiding and driving functions;
FIG. 5 is a schematic diagram of magnetic pole distribution and magnetic circuit in a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator;
FIG. 6 is a cross-sectional view of a protruding moving part in a cylindrical electromagnetic actuator with centripetal excitation of permanent magnets combined with guiding and driving;
FIG. 7 is a schematic diagram of a protruding static pressure air-floating structure in a permanent magnet centripetal excitation cylindrical electromagnetic actuator with combined guiding and driving functions;
fig. 8 is a schematic diagram of the position of a protruding air inlet hole in a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator.
In the drawings, the reference numbers:
100. an electromagnetic drive component; 110. a lower magnetic yoke; 120. a permanent magnet; 130. a central magnetic yoke; 140. a motion cavity; 160. an air gap; 170. a mounting frame; 170a, a mounting groove; 170b, mounting holes;
200. a moving part; 210. a work table surface; 220. a coil bobbin; 230. a direct current coil; 240. an exciting coil; 250. a static pressure air flotation structure; 251. an air chamber; 252. an air outlet; 253. an air inlet hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The invention provides a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator, which comprises an electromagnetic driving part 100 and a moving part 200, and is shown in figures 1-8.
The electromagnetic driving part 100 comprises a cylindrical lower magnetic yoke 110 and an annular permanent magnet 120 arranged on the inner side of the lower magnetic yoke 110; the inner side of the lower yoke 110 and the lower side of the permanent magnet 120 enclose to form a moving cavity 140; a central yoke 130 is mounted on the lower yoke 110 inside the movement chamber 140; an air gap 160 is provided between the central yoke 130 and the permanent magnet 120. In this embodiment, the width of the air gap 160 is 10mm, in which a high uniformity of magnetic induction distribution is formed.
Further, the lower yoke 110, the permanent magnet 120, and the central yoke 130 are coaxially disposed; the center yoke 130 is located at the center of the lower yoke 110.
The outer side surface of the permanent magnet 120 abuts against the inner surface of the lower yoke 110; a mounting frame 170 for fixing the center yoke 130 and supporting the permanent magnet 120 is provided in the moving chamber 140; the mounting frame 170 is annular, an annular mounting groove 170a is formed in the mounting frame 170, and a mounting hole 170b is formed in the bottom of the mounting groove 170 a; when being installed, the lower yoke 110 may be fixedly coupled to the lower yoke by bolts passing through the mounting holes 170 b. The inside wall of mounting bracket 170 supports central yoke 130, and the side supports permanent magnet 120 on the top, the downside of mounting bracket 170 can dismantle the connection lower yoke 110. The permanent magnet 120 on the upper side can be supported and the center yoke 130 can be fixed by the installation frame 170. The detachable connection may be fixed by bolts or other connection methods, which are not limited herein.
It should be noted that, in this embodiment, the mounting bracket 170 is made of a non-magnetic material, such as an aluminum alloy.
The permanent magnet 120 includes one permanent magnet 120 or a plurality of permanent magnets 120 bonded to each other.
Specifically, the permanent magnet 120 may be a ferromagnetic permanent magnet made of NdFeB, and the NdFeB material used has a remanence of 1.17T and a coercivity of 890kA/m. The lower magnetic yoke 110 and the central magnetic yoke 130 are both made of high-permeability electric pure iron material DT4C, the maximum relative permeability can reach 12000, and the saturation magnetic flux is 2.5T.
The path that the magnetic lines of force of the permanent magnet 120 forming the main magnetic circuit after excitation pass through the lower yoke 110, the central yoke 130, the air gap 160 in sequence from the N pole of the permanent magnet 120, and then return to the S pole of the permanent magnet 120 to form a closed magnetic circuit is shown in fig. 5.
The material of the moving part 200 is ceramic or aluminum alloy or beryllium. The magnetic field coil comprises a worktable 210 positioned on the upper side of a central magnetic yoke 130, wherein a coil framework 220 is arranged on one side surface of the worktable 210 close to the central magnetic yoke 130, and the coil framework 220 is annular and is sleeved on the outer side of the central magnetic yoke 130 in a sliding manner; a direct current coil 230 and an exciting coil 240 are wound on the outer side wall of the coil frame 220, and direct current with a fixed size is introduced into the direct current coil 230 to generate an ampere force opposite to the gravity direction of the moving part 200; the exciting coil 240 is energized with a controllable driving current to generate an electromagnetic driving force.
The moving member 200 is made of aluminum alloy, and is integrally cylindrical,
the direct current coil 230 and the exciting coil 240 are formed by winding insulated copper enameled wires on the outer surface of the coil framework 220, the cross section is in an O shape, the thickness is 3mm, and the maximum current density is 5A/mm 2 . Magnetic circuit structure of electromagnetic vibration tableAfter assembly, the dc coil 230, the excitation coil 240, and the bobbin 220 are positioned in the air gap 160.
The fixed magnitude direct current is calculated by the following equation: i is DC = mg/(BL). In the formula, I DC The magnitude of the dc current passed through the dc coil 230, m is the mass of the moving part 200 and the related components fixed on the table 210, g is the gravitational acceleration, B is the average magnetic induction distributed in the air gap 160, and L is the length of the dc coil 230.
The direct current coil 230 and the exciting coil 240 are positioned in the air gap 160 and in the uniform magnetic field distribution region; when the dc coil 230 is not required to counteract the gravity of the moving member 200, the dc coil 230 and the exciting coil 240 may be connected to each other, and a driving current is supplied to achieve a large electromagnetic driving force.
After the control signal is input into the exciting coil 240 and is amplified by the power amplifier, the power current with the effective value up to dozens of amperes can be obtained, and according to the electromagnetic field theory, the exciting coil 240 electrified in the magnetic field is acted by the ampere force in the vertical direction, so that the precisely controllable electromagnetic driving force can be output. The magnitude and direction of the electromagnetic driving force can be precisely controlled by controlling the magnitude and direction of the current. If the control signal is a standard sinusoidal electrical signal, the moving member 200 will generate a standard sinusoidal vibration in the axial direction under the electromagnetic driving force.
In one embodiment, the coil bobbin 220 is provided with a static pressure air bearing structure 250, and the static pressure air bearing structure 250 controls the formation of a static pressure air film between the coil bobbin 220 and the central magnetic yoke 130. The static pressure air bearing structure 250 is used to generate vertical standard vibration, and in this embodiment, the maximum stroke is 10mm.
The static pressure air floating structure 250 comprises a cylindrical cavity type air chamber 251 arranged in the coil framework 220, one side surface of the coil framework 220 close to the central magnetic yoke 130 is provided with air outlet holes 252, the air outlet holes 252 are communicated with the air chamber 251, and the air outlet holes 252 are uniformly distributed on the inner surface of the coil framework 220. An air inlet hole 253 is formed in the outer surface, away from the central magnetic yoke 130, of the coil framework 220, the air inlet hole 253 is connected with the air chamber 251, and the air inlet hole 253 is connected with an air supply source. Specifically, the diameter of the air hole may be 2mm.
In this embodiment, the lower cross section of the bobbin 220 is annular, and the diameter is 80mm. The static pressure air-floating structure 250 is sleeved on the central magnetic yoke 130 through the coil framework 220, so that the static pressure air-floating guide rail and the electromagnetic driving structure are completely parallel in the axial direction, and the assembly precision is ensured; the inside surface of the bobbin 220 is fitted to the size of the center yoke 130 during the assembly process, so that the bobbin 220 and the center yoke 130 can be easily fitted together, and the assembly has high reliability.
In another embodiment, a sliding guide or a rolling guide may be further disposed between the bobbin 220 and the center yoke 130.
The invention provides a guiding and driving combined permanent magnet centripetal excitation cylindrical electromagnetic actuator, which can realize the quick coaxial installation of a lower magnetic yoke 110, a permanent magnet 120 and a central magnetic yoke 130 through the lower magnetic yoke 110, the permanent magnet 120, the central magnetic yoke 130 and an installation frame 170, and simultaneously, through the scheme of the integrated design of a static pressure air floating structure 250 and the central magnetic yoke 130, the assembly difficulty of a moving part 200 is reduced to the maximum extent, the dead weight of the moving part 200 is reduced, and the assembly precision and the driving capability of the electromagnetic actuator can be effectively improved; in addition, the dc coil 230 is located in the uniform magnetic field distribution region, so as to avoid introducing interference.
The method has the following specific beneficial effects:
(1) The magnetic structure of the permanent magnet 120 with centripetal excitation adopted by the invention can generate stronger magnetic induction intensity in the air gap 160, and is suitable for occasions with high requirements on electromagnetic driving force.
(2) According to the invention, the central magnetic yoke 130 is processed into a guide shaft form, and the coil framework 220 is made into a sliding mechanism, so that the design of the electromagnetic actuator integrating guidance and driving is completed, high assembly precision is realized, and the movement precision of the electromagnetic actuator is improved. The moving part 200 is sleeved on a guide shaft formed by the central magnetic yoke 130 as a sliding mechanism, and the static pressure air floating structure 250, the sliding guide rail form or the rolling guide rail form is adopted, so that the integration of guiding and driving is realized, the axial directions of the moving part 200 and the electromagnetic driving structure are completely parallel, high assembly precision is achieved, the transverse vibration caused by assembly errors is avoided, and the waveform precision of electromagnetic driving is effectively improved.
(3) The invention realizes the miniaturization design target of the electromagnetic actuator and can obviously improve the load capacity of the electromagnetic actuator. The electromagnetic actuator integrating guiding and driving does not need an additional guiding mechanism, has compact structure, is more miniaturized, and is beneficial to the installation and transportation of equipment. No additional guide mechanism occupies extra space, the size of the moving part 200 is greatly reduced, the light weight of the moving part 200 is structurally realized, and the load capacity of the electromagnetic actuator is effectively improved.
(4) The invention can avoid the problem that the direct current coil 230 generates vibration harmonic wave due to the nonlinear electromagnetic force outside the air gap 160. The direct current coil 230 is disposed in the region where the magnetic field distribution of the air gap 160 is uniform, direct current of a fixed magnitude is conducted to enable the direct current coil 230 to be subjected to an ampere force equal to the gravity of the moving part 200, active positive stiffness support is achieved by conducting control quantity based on displacement feedback in the exciting coil 240 in a superimposed mode, and harmonic interference caused by the fact that the direct current coil 230 is subjected to nonlinear electromagnetic force outside the air gap 160 is avoided.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. The utility model provides a direction and drive compound permanent magnet centripetal excitation cylindrical electromagnetic actuator which characterized in that: comprises an electromagnetic driving component (100) and a moving component (200);
the electromagnetic driving part (100) comprises a cylindrical lower magnetic yoke (110) and an annular permanent magnet (120) arranged on the inner side of the lower magnetic yoke (110); the inner side of the lower magnetic yoke (110) and the lower side of the permanent magnet (120) enclose to form a motion cavity (140); a central magnetic yoke (130) is arranged on the lower magnetic yoke (110) and positioned at the inner side of the movement cavity (140); an air gap (160) is arranged between the central magnetic yoke (130) and the permanent magnet (120);
the moving part (200) comprises a worktable surface (210) positioned on the upper side of the central magnetic yoke (130), a coil framework (220) is arranged on one side surface, close to the central magnetic yoke (130), of the worktable surface (210), and the coil framework (220) is annular and is sleeved on the outer side of the central magnetic yoke (130) in a sliding manner; a direct current coil (230) and an exciting coil (240) are wound on the outer side wall of the coil framework (220), and direct current with a fixed size is introduced into the direct current coil (230) to generate an ampere force opposite to the gravity direction of the moving part (200); the exciting coil (240) is energized with a controllable driving current to generate an electromagnetic driving force.
2. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 1, wherein: and a static pressure air floatation structure (250) is arranged on the coil framework (220), and the static pressure air floatation structure (250) controls a static pressure air film to be formed between the coil framework (220) and the central magnetic yoke (130).
3. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 2, wherein: the static pressure air floating structure (250) comprises a cylindrical cavity type air chamber (251) arranged in the coil framework (220), one side surface, close to the central magnetic yoke (130), of the coil framework (220) is provided with air outlet holes (252), the air outlet holes (252) are communicated with the air chamber (251), and the air outlet holes (252) are uniformly distributed on the inner surface of the coil framework (220);
an air inlet hole (253) is formed in the outer surface, away from the central magnetic yoke (130), of the coil framework (220), the air inlet hole (253) is connected with the air chamber (251), and the air inlet hole (253) is connected with an air supply source.
4. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 1, wherein: the lower magnetic yoke (110), the permanent magnet (120) and the central magnetic yoke (130) are coaxially arranged; the center yoke (130) is located at the center of the lower yoke (110).
5. The guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 4, wherein: the outer side surface of the permanent magnet (120) abuts against the inner surface of the lower magnetic yoke (110);
a mounting rack (170) which is used for fixing the central magnetic yoke (130) and supporting the permanent magnet (120) is arranged in the motion cavity (140); the mounting frame (170) is annular, and an annular mounting groove (170 a) is formed in the mounting frame (170); a mounting hole (170 b) is formed in the mounting rack (170) and positioned at the bottom of the mounting groove (170 a); the inside wall butt of mounting bracket (170) center yoke (130), the side butt of going up the permanent magnet (120), the downside of mounting bracket (170) can dismantle the connection lower yoke (110).
6. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator as claimed in claim 1, wherein: and a sliding guide rail or a rolling guide rail is arranged between the coil framework (220) and the central magnetic yoke (130).
7. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 1, wherein: the permanent magnet (120) comprises one permanent magnet (120) or a plurality of permanent magnets (120) which are adhered to each other.
8. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator according to claim 1, wherein: the direct current coil (230) and the exciting coil (240) are positioned in the air gap (160) and in a region with uniform magnetic field distribution;
the DC coil (230) and the excitation coil (240) are connectable to each other.
9. A guiding and driving composite permanent magnet centripetal excitation cylindrical electromagnetic actuator as claimed in claim 1, wherein: the fixed magnitude direct current is calculated by the following formula: i is DC = mg/(BL); in the formula, I DC The magnitude of the direct current passed through the direct current coil (230), m is the mass of the moving part (200) and the related components fixed on the working table (210), g is the gravitational acceleration, B is the average magnetic induction distributed in the air gap (160), and L is the length of the direct current coil (230).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511016A (en) * | 2023-02-08 | 2023-08-01 | 秦皇岛信能能源设备有限公司 | Electrohydraulic composite vibration device and vibration control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511016A (en) * | 2023-02-08 | 2023-08-01 | 秦皇岛信能能源设备有限公司 | Electrohydraulic composite vibration device and vibration control method thereof |
| CN116511016B (en) * | 2023-02-08 | 2023-10-31 | 秦皇岛信能能源设备有限公司 | Electrohydraulic composite vibration device and vibration control method thereof |
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