CN107017071B - A kind of alternating magnetic field generating means and alternating magnetic field production method - Google Patents
A kind of alternating magnetic field generating means and alternating magnetic field production method Download PDFInfo
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- CN107017071B CN107017071B CN201710294868.0A CN201710294868A CN107017071B CN 107017071 B CN107017071 B CN 107017071B CN 201710294868 A CN201710294868 A CN 201710294868A CN 107017071 B CN107017071 B CN 107017071B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
Abstract
The invention discloses a kind of alternating magnetic field generating means alternating magnetic field production method, including the two poles of the earth electromagnet, solenoid coil, the first magnetic field detecting coil, the second magnetic field detecting coil, two-phase synchronizing current source, control unit and phase detectors；The center of solenoid coil and the two poles of the earth electromagnet air gap center superposition, the axis of solenoid coil is perpendicular to the two poles of the earth electromagnet plane；First magnetic field detecting coil is positioned on solenoid coil inwall, and axis is in X-axis；Second magnetic field detecting coil is positioned over the center of solenoid coil；The phase information input of control unit is connected with phase detectors, and the first induced voltage input is connected with the first magnetic field detecting coil, and the second induced voltage input is connected with the second magnetic field detecting coil, and output end is connected with the control terminal in two-phase synchronizing current source；Control unit exports the control signal for adjusting the current phase and amplitude size of A phases and B phases in two-phase synchronizing current source.
Description
Technical field
The invention belongs to biomedicine technical field, more particularly, to a kind of alternating magnetic field generating means and alternation magnetic
Field production method.
Background technology
Bioelectromagnetics is an emerging cross discipline, is studied by biomagnetism, can obtain relevant big point of biology
Son, cell, tissue and organ structure and emic information, understand transport of substances, energy conversion and information in vital movement
The performance and effect of biomagnetism in transmittance process.Magnetic nano-particle by surface-to-volume ratio it is big, be easy to carry out biology
Functionalization, optical contrast performance are good, the advantages that being controlled with externally-applied magnetic field, become the main load of modern electromagnetism medical technology
Body.Magnetic nanometer carrier movement is controlled using externally-applied magnetic field, is the major impetus mode of present electromagnetism medical technology.Such as：
Control magnetic nanometer carrier to carry DNA by externally-applied magnetic field in magnetic transfection and carry out gene transfection；By additional in bedside detection
Magnetic field control magnetic nanometer carries out microring array, analyte capture, mark, cleaning etc..Therefore, under various magnetic fields forms
The motor behaviors such as magnetic nanometer reunion, depolymerization, targeting also become study hotspot, particularly rotating excitation field and oscillating magnetic field is made
It is Research Challenges with the reunion and depolymerization behavior of lower magnetic nanometer.
In magnetic fluid, magnetic nano-particle can be in chainlike distribution along magnetic field under uniform magnetic field effect；Magnetic nano particle
Son is in chainlike distribution under oscillating magnetic field effect, and the direction of magnetic nano particle subchain periodically becomes along magnetic field oscillation direction
Change；Magnetic nano-particle is under rotating excitation field effect, and single particle has spinning phenomenon, and the particle chain of chaining particle follows rotation
Magnetic field rotating.Study different magnetic field action mode, the dynamic behavior of different magnetic field action intensity magnetic nano-particle, to magnetic
Property nano-particle be of great significance in biomedicine technical field using tool.
Generation device of rotating magnetic field mainly has Helmholtz coil, multi-pole solennoid, rotating permanent magnet etc. at present.It is Chinese special
A kind of sharp CN102820118B " system and its rotating excitation field implementation method occur for rotating excitation field " discloses a kind of using three group two
Two orthogonal Helmholtz coils produce the device of space rotating magnetic field, are given respectively by microprocessor control three-way direct current power supply
Three groups of Helmholtz coils pass to different size of DC current, you can produce any axial rotating excitation field.The device uses
The mode of direct current supply, it is low to power requirement, but its caused magnetic field is not the magnetic field continuously rotated in theory.
Chinese patent CN102195369B " a kind of rotating excitation field electromagnetism halbach arrays and control method " discloses one kind and uses electromagnetism
Coil composition halbach arrays produce the device of rotating excitation field, and the principle of device uses electromagnetism halbach similar to alternating current generator
The three-phase symmetric winding that array composition space quadrature is 120 °, then lead to three-phase symmetrical alternating current and form rotating excitation field, lead to
Cross halbach display arrangement modes and improve the magnetic field intensity of working region to a certain extent, but the coil of the device around
System and spatial arrangement are complex, have and certain design and develop difficulty.These use the magnetic field device magnetic field of Helmholtz coil
Intensity is relatively low, typically up to only more than ten milli teslas, limits the extensive use of this kind of device.Produced using multi-pole solennoid
Rotating excitation field, due to coupling unmanageable between magnetic circuit and quantifying, its design optimization is complicated, ensures certain magnetic in working region
Field intensity and uniformity difficulty are larger.In addition, the mode for driving permanent magnet rotation currently with motor produces rotating excitation field
Report is not rarely seen, but utilizes the field generator for magnetic in permanent magnet generation magnetic field, and its magnitude of field intensity is unadjustable.
, it is necessary to which magnetic field intensity scope reaches milli teslas up to a hundred in magnetic nano-particle behavior manipulation research, though at present
So uniformity of magnetic field is not proposed to be distinctly claimed, but in order to avoid the influence of magnetic field gradient power, uniformity of magnetic field is higher will
The research of magnetic nanometer behavior can be more advantageous to.In summary, although the field generator for magnetic tool of Helmholtz coil form
There is higher uniformity of magnetic field, but it is difficult to meet the requirement of magnetic nanometer behavioral study in magnetic field intensity；By reasonable
Although design multipole magnet can meet to require in magnetic field intensity, the uniformity of magnetic field of multipole magnet is difficult to ensure that,
In addition the optimization design of multi-pole solennoid is also complex.The field generator for magnetic of permanent magnet form, because its magnetic field is light
It is unadjustable to spend size, therefore is not suitable for the research of magnetic nanometer behavior.
The content of the invention
The defects of for prior art, it is an object of the invention to provide a kind of alternating magnetic field generating means and alternating magnetic field
Production method, it is intended to solve the low and multistage electromagnet class of current Helmholtz coil type alternating magnetic field generating means magnetic field intensity
The problem of type alternating magnetic field generating means complex designing and low uniformity of magnetic field.
The invention provides a kind of alternating magnetic field generating means, including：The two poles of the earth electromagnet, solenoid coil, the first magnetic field
Search coil, the second magnetic field detecting coil, two-phase synchronizing current source, control unit and phase detectors；The two poles of the earth electromagnet includes：
Electromagnet iron yoke, the first electromagnet coil and the second electromagnet coil, the long side of electromagnet iron yoke parallel to X-axis and short side it is parallel
Set in Z axis；First electromagnet coil and the second electromagnet coil are wound on two magnetic poles of electromagnet iron yoke respectively, and its
Position is symmetrical on YZ planes；The axis of solenoid coil is perpendicular to the two poles of the earth electromagnet plane, and solenoid coil is positioned over two
In the air gap of pole electromagnetism iron circuit；First magnetic field detecting coil is positioned on the solenoid coil inwall, and its axis is located at X-axis
On；Second magnetic field detecting coil is positioned over the centre of the solenoid coil, and its axis is located in Y-axis；Two is identical
A phases export in step current source passes through phase detectors successively, and the second electromagnet coil and the first electromagnet coil are formed first time
Road, the first loop are used to provide the first electric current to the second electromagnet coil and the first electromagnet coil；B in two-phase synchronizing current source
Mutually output forms second servo loop by phase detectors and solenoid coil successively, and second servo loop is used to provide to solenoid coil
Second electric current；Wherein the first electric current differs 90 degree with the second current phase；The phase information input of control unit and the phase
Bit detector connects, and the first induced voltage input of control unit is connected with the first magnetic field detecting coil, and the of control unit
Two induced voltage inputs are connected with the second magnetic field detecting coil, the output end of control unit and the control in two-phase synchronizing current source
End connection；Control unit is used for the current and phase difference according to phase detectors acquisition, first that the first magnetic field detecting coil obtains
The second induced voltage that induced voltage and the second magnetic field detecting coil obtain carries out processing and obtained for adjusting two-phase synchronizing current
The control signal of the current phase and amplitude size of A phases and B phases in source；Wherein, coordinate system is that the right hand space right-angle of standard is sat
Mark system, the center of electromagnet iron yoke air gap is as origin, and the long side direction of electromagnet iron yoke is as X-direction, solenoid coil
Axis as Y-axis, the short side direction of electromagnet iron yoke is as Z-direction.
Further, solenoid coil is centrally located at the origin of coordinate system, and the axis of solenoid coil is located at
In the Y-axis of coordinate system.
Further, electromagnet iron yoke is C font structures.
Further, electromagnet iron yoke is process by silicon steel, and the electromagnet iron yoke length is 200mm, and width is
100mm, sectional area are 20 × 20mm2；Width of air gap is 30mm.
Further, the first electromagnet coil and second electromagnet coil use sectional area as 1mm2Copper cash
It is wound on the magnetic pole of electromagnet iron yoke, the thickness of first electromagnet coil and second electromagnet coil is 10mm, long
Spend for 60mm.
Further, solenoid coil uses sectional area as 1mm2Copper wire winding, its height is 60mm, external diameter
30mm, internal diameter 10mm；First magnetic field detecting coil and second magnetic field detecting coil use external diameter to be painted for 0.05mm
Envelope curve single turn coiling, its a diameter of 10mm.
Present invention also offers a kind of alternating magnetic field production method based on above-mentioned alternating magnetic field generating means, including under
State step：
Field frequency f and magnetic field amplitude B is set by control unit1, it is f's to control two-phase synchronizing current source output frequency
A phases and B phase sinusoidal currents, A phases and B phase sinusoidal currents are sinusoidal with B phases to A phases by phase detectors after phase detectors
The phase of electric current judged, and result fed back into control unit, and control unit is according to the testing results pair of phase detectors
Two-phase synchronizing current source sends phase adjusted instruction, and it is 90 degree to make A phases and B phase sinusoidal currents phase difference；
The A phases in two-phase synchronizing current source export is provided in series electric current to the first electromagnet coil and the second electromagnet coil
Excitation, produces X-direction, the magnetic field of size sinusoidal variations in air gap；
The B phases in two-phase synchronizing current source export provides current excitation to solenoid coil, and Y-axis is produced in solenoid coil
Direction, the magnetic field of size sinusoidal variations；
First magnetic field detecting coil and the second magnetic field detecting coil are respectively to the width in X-direction magnetic field and Y direction magnetic field
Value is detected, and testing result fed back into control unit, control unit two-phase synchro source is sent instruction regulation A phases and
B phase currents make magnetic field amplitude be maintained at the magnetic field amplitude B of setting1, so as to produce rotating excitation field in X/Y plane.
Further, when A phases, which export the advanced B phases of sinusoidal current phase, exports 90 degree of sinusoidal current, in line solenoid
The circular rotating field to turn clockwise is produced in circle center X/Y plane；
When B phases, which export the advanced A phases of sinusoidal current phase, exports 90 degree of sinusoidal current, in line solenoid circle center X/Y plane
The interior circular rotating field for producing rotate counterclockwise.
Present invention also offers a kind of alternating magnetic field production method based on above-mentioned alternating magnetic field generating means, including under
State step：
Oscillating magnetic field frequency f, oscillating magnetic field amplitude B are set by control unit1And direction of vibration, and control two to be synchronised
It is f sinusoidal current that the A phases of current source, which export DC current and B phases output frequency, or B phases export DC current and A phases are defeated
Go out the sinusoidal current that frequency is f；
The A phases in two-phase synchronizing current source export is provided in series electric current to the first electromagnet coil and the second electromagnet coil
Excitation, the magnetic field of X-direction is produced in air gap；
The B phases in two-phase synchronizing current source export provides current excitation to solenoid coil, and Y-axis is produced in solenoid coil
The magnetic field in direction；
First magnetic field detecting coil is detected to the amplitude in X-direction magnetic field or the second magnetic field detecting coil is to Y-axis
The amplitude in direction magnetic field is detected, and testing result is fed back into control unit, and control unit is sent to two-phase synchro source
The magnetic field amplitude B that instruction adjusts A phases or B phase currents make magnetic field amplitude be maintained at setting1；So as to produce oscillating magnetic field.
Further, when A phases export DC current, and B phases export sinusoidal current, in line solenoid circle center X/Y plane
Oscillating magnetic field that is interior to produce using X-axis as symmetry axis, being vibrated in Y direction；
When B phases export DC current, and A phases export sinusoidal current, can be produced in line solenoid circle center X/Y plane with Y
Axle is symmetry axis, the oscillating magnetic field vibrated in X-direction.
By the contemplated above technical scheme of the present invention, compared with prior art, as a result of solenoid and the two poles of the earth
The magnet structure that electromagnet is combined, can be obtained compared with Helmholtz coil type alternating magnetic field generating means caused by most
Big magnetic field intensity is high, energy expenditure small beneficial effect when producing equal magnetic field, occurs with multistage solenoid type alternating magnetic field
Device compares the beneficial effect that can obtain that optimization design is simple, perfect heat-dissipating and uniformity of magnetic field are high；As a result of magnetic
The feedback control of field search coil, can obtain the high beneficial effect of magnetic field control accuracy.
Brief description of the drawings
Fig. 1 is the structural representation for the alternating magnetic field generating means that embodiment of the present invention provides；
Fig. 2 is the rotating excitation field schematic diagram that embodiment of the present invention provides；
Fig. 3 is the oscillating magnetic field schematic diagram vibrated in the Y direction that embodiment of the present invention provides.
In institute's accompanying drawing, 1 is electromagnet iron yoke, and 2 be the first electromagnet coil, and 3 be the second electromagnet coil, and 4 be helical
Pipeline circle, 5 be the first magnetic field detecting coil, and 6 be the second magnetic field detecting coil, and 7 be two-phase synchronizing current source, and 8 be control unit,
9 be phase detectors.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that it is described herein specific implementation example only to explain the present invention,
It is not intended to limit the present invention.
The invention provides a kind of alternating magnetic field generating means, it is intended to solves existing Helmholtz coil field generator for magnetic
The problem of magnetic field intensity is not high, and the multi-pole solennoid field generator for magnetic complex designing uniformity is relatively low.The present invention can be with generation
It is suitable for the alternating magnetic field of magnetic nanometer behavioral study, basis is done in the application of biomedicine field for magnetic nanometer.
The invention provides a kind of alternating magnetic field generating means, including：Electromagnet iron yoke, the first electromagnet coil, second
Electromagnet coil, solenoid coil, the first magnetic field detecting coil, the second magnetic field detecting coil, two-phase synchronizing current source, control are single
Member and phase detectors；Wherein：Electromagnet iron yoke, the first electromagnet coil and the second electromagnet coil constitute the two poles of the earth electromagnetism
Iron.
As one embodiment of the present of invention, electromagnet iron yoke is C font structures, as magnetic loop, the first electromagnetism iron wire
Circle and the second electromagnet coil are connected in series, as excitation.
Electromagnet iron yoke can be process by silicon steel, and electromagnet coil and solenoid coil are 1mm by sectional area2's
Copper wire winding, the line gauge of wire suitably select according to kelvin effect, supply current and processing complexity.
Skin depthWherein：F is power frequency, and μ is wire magnetic conductivity, ξ wire electrical conductivity.Consider
Conductor efficiency diameter of wire should be less than 2* δ.
In present apparatus example：Peak frequency is 200Hz, and it is 4.7mm to be computed skin depth, so diameter of wire should be less than
9.4mm；Supply current about 10A, 1mm is more than or equal to according to the optional sectional area of wire of copper cash current capacity2；For ease of coiling
It is 1mm to choose sectional area herein2Copper cash.
In the present invention, coordinate system is the right hand rectangular coordinate system in space of standard used by location expression.The two poles of the earth electromagnet
Air gap center and it is solenoidal be centrally located at coordinate origin, the long side of electromagnet iron yoke parallel to X-axis, electromagnet iron yoke
For short side parallel to Z axis, the axis of solenoid coil is Y-axis.Line solenoid coil axis is placed perpendicular to the two poles of the earth electromagnet plane
In the air gap of the two poles of the earth electromagnetism iron circuit.The two poles of the earth electromagnet and solenoid coil are applied respectively continuous current excitation, it is ac-excited or
Person's continuous current excitation and ac-excited combination, can produce uniform magnetic field, rotating excitation field and oscillating magnetic field, specifically see below and chat
State.
Two-phase synchronizing current source includes the output of two-phase controllable current, and it is direct current or exchange that can control its current forms,
Controllable current size and Orientation during direct current output, exchange can be with control electric current frequency, amplitude and phases when exporting.
First magnetic field detecting coil and the second magnetic field detecting coil can separately detect X axis and Y-axis by enamel-covered wire coiling
To alternating magnetic field amplitude.In order to ensure the sensitivity enamel-covered wire line footpath of search coil be generally less than be equal to 0.1mm, consider around
Difficulty and the present apparatus requirement processed, herein from 0.1mm line footpaths.
Phase detectors, current phase can be detected when two-phase synchronizing current source exports alternating current.
Control unit can be according to institute's setting parameter, the first magnetic field detecting coil, the second magnetic field detecting coil and phase-detection
The output form and current parameters of the output signal control two-phase synchronizing current ource electric current of device.
In the prior art, the mode for producing controllable rotating magnetic field is Helmholtz coil and multi-pole solennoid, but this two
Kind mode has the defects of obvious.The characteristic of Helmholtz coil determines that this kind of magnetic field device magnetic field intensity is relatively low, typically most
Height only has more than ten milli teslas, improves that the magnetic field intensity of this kind of magnetic field device is very difficult, limits extensively should for this kind of device
With.For multi-pole solennoid due to coupling unmanageable between magnetic circuit and quantifying, its design optimization is complicated, ensures in working region certain
Magnetic field intensity and uniformity difficulty it is larger.Compared with prior art, the present invention uses the two poles of the earth electromagnet and solenoid coil
The mode of conjunction produces rotating excitation field, takes full advantage of solenoid coil perfect heat-dissipating, magnetic field intensity, the advantages of uniformity is high,
The complexity problem of multi-pole solennoid design is turn avoid simultaneously, and field frequency and amplitude size are realized all by feedback control
Adjustable rotating excitation field.In addition, the present apparatus can produce but be not limited only to produce rotating excitation field.In addition to rotating excitation field, may be used also
To produce uniform magnetic field and oscillating magnetic field.
For the alternating magnetic field generating means that further description embodiment of the present invention provides, now rotating excitation field is produced
Raw principle is explained.With reference to Fig. 1, when the output current of two-phase synchro source 7 is：W is
Sinusoidal current angular frequency.
Consider that electromagnet magnetic field effect influences, if hystertic angle is α, then the magnetic induction intensity of X-axis and Y direction is：The Distribution of Magnetic Field having in X/Y plane is：Due to hystertic angle very
It is small, it is possible to ignore parenthetical term on the right side of formula (3), that is, work as Bx=By, can be in line solenoid circle center X/Y plane during cos α
Circular rotating field is produced, as shown in Figure 2.
Now principle is produced to oscillating magnetic field to explain.With reference to Fig. 1, when 7 a certain phase of two-phase synchro source exports direct current, separately
Oscillating magnetic field can be produced during outer phase output sinusoidal current, such as：A phase currents are direct current, when B phase currents are sinusoidal current, X-axis
Magnetic induction intensity with Y direction is：The Distribution of Magnetic Field having in X/Y plane
For：Produced i.e. in line solenoid circle center X/Y plane using x-axis as symmetry axis
Upper and lower oscillating magnetic field, as shown in figure 3, maximum deflection is atan (By/Bx)。
Now principle is produced to uniform magnetic field to explain.When A phase currents are direct current, and B phase currents are also direct current, X-axis and Y
The magnetic induction intensity of direction of principal axis is：
The Distribution of Magnetic Field having in X/Y plane is：Deflection is atan (By/Bx)。
It should be appreciated that specific implementation example described herein is not used to limit this hair only to explain the present invention
It is bright.In this example, electromagnet iron yoke 1 is to be process c-type magnetic pole by silicon steel, and electromagnet iron yoke length is 200mm, and width is
100mm, sectional area are 20 × 20mm2, width of air gap 30mm.First electromagnet coil 2 and the second electromagnet coil 3, which use, to be cut
Area is 1mm2Copper cash be wound on the magnetic pole of electromagnet iron yoke, the thickness of the first electromagnet coil 2 and the second electromagnet coil 3
For 10mm, length 60mm.Solenoid coil 4 uses sectional area as 1mm2Copper wire winding, its height is 60mm, external diameter
30mm, internal diameter 10mm.First magnetic field detecting coil 5 and the second magnetic field detecting coil 6 use external diameter as 0.05mm enamel-covered wire lists
Circle coiling, its a diameter of 10mm.
As shown in figure 1, coordinate system is the right hand rectangular coordinate system in space of standard used by present apparatus location expression, space
Coordinate system includes origin, X-axis, Y-axis and Z axis；Wherein the center of electromagnet iron yoke air gap is as origin, the long side of electromagnet iron yoke
Direction is as X-direction, and the axis of solenoid coil is as Y-axis, and the short side direction of electromagnet iron yoke is as Z-direction.
The long side of electromagnet iron yoke is set parallel to X-axis and short side parallel to Z axis；The axis of solenoid coil 4 is perpendicular to two
Pole electromagnet plane is positioned in the air gap of the two poles of the earth electromagnetism iron circuit；Solenoid coil 4 is centrally located at the origin of coordinate system,
The axis of solenoid coil 4 is located in the Y-axis of coordinate system.First electromagnet coil 2 and the difference coiling of the second electromagnet coil 3
On two magnetic poles of electromagnet iron yoke, its position is symmetrical on YZ planes.First magnetic field detecting coil 5 places solenoid coil
On 4 inwalls, its axis is located in X-axis.Second magnetic field detecting coil 6 is placed on the centre of solenoid coil 4, and its axis is located at
In Y-axis.
A phases export in two-phase synchronizing current source 7 passes through phase detectors successively, the second electromagnet coil 3 and the first electromagnetism
Iron coil 2 forms the first loop, and the first loop is used to provide the first electricity to the second electromagnet coil 3 and the first electromagnet coil 2
Stream；B phases export in two-phase synchronizing current source 7 passes through phase detectors and the formation second servo loop of solenoid coil 4 successively, second time
Road is used to provide the second electric current to solenoid coil 4；Wherein the first electric current differs 90 degree with the second current phase.
The phase information input of control unit 8 is connected with phase detectors 9, and the first induced voltage of control unit 8 is defeated
Enter end to be connected with the first magnetic field detecting coil 5, the second induced voltage input and the second magnetic field detecting coil 6 of control unit 8
Connection, the output end of control unit 8 are connected with the control terminal in two-phase synchronizing current source 7；Control unit 8 is used for according to phase-detection
Current and phase difference, the first induced voltage of the first magnetic field detecting coil 5 acquisition and the second magnetic field detecting coil 6 that device 9 obtains obtain
The second induced voltage handled (be specifically as follows to induced voltage carry out Integral Processing) obtain it is identical for adjusting two
Walk the control signal of the current phase and amplitude size of A phases and B phases in current source 7.
Electromagnet iron yoke 1, the first electromagnet coil 2, the second electromagnet coil 3 constitutes the two poles of the earth electromagnet, for producing X
The magnetic field of direction of principal axis.Solenoid coil 4 is used for the magnetic field for producing Y direction.First magnetic field detecting coil 5 is used to detect X-axis side
To magnetic field size.Second magnetic field detecting coil 6 is used for the magnetic field size for detecting Y direction.Two-phase synchronizing current source 7 is used for defeated
Go out two-way phase, amplitude, the current excitation of frequency-adjustable.Phase detectors 9 are used to detect the two-way electric current of two-phase synchronizing current source 7
The phase difference of excitation.Control unit 8 is according to the first magnetic field detecting coil 5, the second magnetic field detecting coil 6 and phase detectors 9
The amplitude and phase of the two-way current excitation of detection signal regulation synchronizing current source 7.
Rotating excitation field produces process：Field frequency f (5Hz-200Hz) and magnetic field amplitude are set by control unit 8 first
B1(0-100mT), control unit 8 issue instructions to two-phase synchronizing current source 7, the output frequency f of two-phase synchronizing current source 7 A phases
With B phase sinusoidal currents, A phases and B phases sinusoidal current pass through phase detectors 9, and phase detectors 9 are to A phases and B phase sinusoidal currents
Phase is judged, and result is fed back into control unit 8, and control unit 8 is according to the testing result of phase detectors 9 to two-phase
Synchronizing current source 7 sends phase adjusted instruction, A phases and B phase sinusoidal current phase differences is maintained at 90 degree.Two are synchronised electricity
The A phases in stream source 7 export is provided in series current excitation to the first electromagnet coil 2 and the second electromagnet coil 3, is produced in air gap
Raw X-direction, the magnetic field of size sinusoidal variations；The B phases in two-phase synchronizing current source 7 export to swash to the offer electric current of solenoid coil 4
Encourage, Y direction, the magnetic field of size sinusoidal variations are produced in solenoid coil 4；First magnetic field detecting coil 5 and the second magnetic field
Search coil 6 is detected to the amplitude in X-direction magnetic field and Y direction magnetic field respectively, and testing result is fed back into control
Unit 8, control unit 8, which sends instruction regulation A phases and B phase currents to two-phase synchro source 7, makes magnetic field amplitude be maintained at setting
Magnetic field amplitude B1.According to rotating excitation field produces principle, rotating excitation field can be now produced in X/Y plane.Specifically：When A phases
When the output advanced B phases of sinusoidal current phase export 90 degree of sinusoidal current, produced in line solenoid circle center X/Y plane clockwise
The circular rotating field of rotation.When B phases, which export the advanced A phases of sinusoidal current phase, exports 90 degree of sinusoidal current, in line solenoid
The circular rotating field of rotate counterclockwise is produced in circle center X/Y plane.
Oscillating magnetic field produces process：The generation of oscillating magnetic field does not need phase detectors 9.Set first by control unit 8
Put oscillating magnetic field frequency f (5Hz-200Hz), oscillating magnetic field amplitude B1(0-100mT), direction of vibration (shake along X-axis or Y direction
It is dynamic)；Control unit 8 sends electric current output order, the A phases in two-phase synchronizing current source 7 is exported DC current, B phase output frequencies
DC current is exported for f sinusoidal current, or B phases, A phases output frequency is f sinusoidal current, is produced according to oscillating magnetic field former
Reason, electric current output form depend on the direction of magnetic field variations.The A phases in two-phase synchronizing current source 7 are exported to the first electromagnet coil 2
With the magnetic field for being provided in series current excitation, X-direction being produced in air gap of the second electromagnet coil 3；Two-phase synchronizing current source 7
B phases export to solenoid coil 4 provide current excitation, in solenoid coil produce Y direction magnetic field；Due to detecting line
Circle can only detect alternating magnetic field, so the size of current of direct current phase is obtained by calculating calibration.First magnetic field detecting coil 5 is to X
The amplitude in direction of principal axis magnetic field is detected or the second magnetic field detecting coil 6 detects to the amplitude in Y direction magnetic field, and will
Testing result feeds back to control unit 8, and control unit 8, which sends instruction regulation A phases or B phase currents to two-phase synchro source 7, to be made
Magnetic field amplitude is maintained at the magnetic field amplitude B of setting1.According to oscillating magnetic field produces principle, when A phases export DC current, B phases
When exporting sinusoidal current, it can produce using X-axis as symmetry axis in line solenoid circle center X/Y plane, be vibrated in Y direction
Oscillating magnetic field；When B phases export DC current, and A phases export sinusoidal current, can be produced in line solenoid circle center X/Y plane with
Y-axis is symmetry axis, the oscillating magnetic field vibrated in X-direction.
Uniform magnetic field produces process：The generation of uniform magnetic field does not need phase detectors 9.Set first by controlling single 8 yuan
The size and Orientation of uniform magnetic field is put, control unit 8 produces principle according to uniform magnetic field, calculates the magnetic field of X-axis and Y direction
Direction and size, because search coil can only detect alternating magnetic field, so the size of current of direct current phase is obtained by calculating calibration.
The A phases in two-phase synchronizing current source 7 export is provided in series DC current to the first electromagnet coil 2 and the second electromagnet coil 3
Excitation, X-direction stationary magnetic field is produced in air gap；The B phases in two-phase synchronizing current source 7, which export, to be provided solenoid coil 4 directly
Current excitation is flowed, the stationary magnetic field of Y direction is produced in solenoid coil；Principle is produced according to uniform magnetic field, in X/Y plane
Interior generationDeflection is atan (By/Bx) uniform magnetic field.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (10)
- A kind of 1. alternating magnetic field generating means, it is characterised in that including：The two poles of the earth electromagnet, solenoid coil, the first detection of magnetic field Coil, the second magnetic field detecting coil, two-phase synchronizing current source, control unit and phase detectors；The two poles of the earth electromagnet includes：Electromagnet iron yoke, the first electromagnet coil and the second electromagnet coil, the electromagnet iron The long side of yoke is set parallel to X-axis and short side parallel to Z axis；First electromagnet coil and second electromagnet coil point It is not wound on two magnetic poles of electromagnet iron yoke, and its position is symmetrical on YZ planes；The axis of the solenoid coil is perpendicular to the two poles of the earth electromagnet plane, and the solenoid coil is positioned over the two poles of the earth electromagnet In the air gap of magnetic circuit, the gentle gap center superposition of line solenoid circle center；First magnetic field detecting coil is positioned on the solenoid coil inwall, and its axis is located in X-axis；Second magnetic Field search coil is positioned over the centre of the solenoid coil, and its axis is located in Y-axis；A phases export in the two-phase synchronizing current source passes through phase detectors, the second electromagnet coil and the first electromagnet successively Coil forms the first loop, and the first loop is used to provide the first electric current to the second electromagnet coil and the first electromagnet coil；Two The B phases in current source that are synchronised export forms second servo loop by phase detectors and solenoid coil successively, and second servo loop is used for The second electric current is provided to solenoid coil；Wherein the first electric current differs 90 degree with the second current phase；The phase information input of described control unit is connected with the phase detectors, and the first induced voltage of control unit is defeated Enter end to be connected with the first magnetic field detecting coil, the second induced voltage input of control unit and the second magnetic field detecting coil connect Connect, the output end of control unit is connected with the control terminal in two-phase synchronizing current source；Control unit is used to be obtained according to phase detectors The first induced voltage and the second of the acquisition of the second magnetic field detecting coil that current and phase difference, the first magnetic field detecting coil taken obtains Induced voltage carries out processing and obtains the control for being used for adjusting the current phase and amplitude size of A phases and B phases in two-phase synchronizing current source Signal processed；Wherein, coordinate system is the right hand rectangular coordinate system in space of standard, and the center of electromagnet iron yoke air gap is as origin, electromagnet The long side direction of iron yoke is as X-direction, and the axis of solenoid coil is as Y-axis, and the short side direction of electromagnet iron yoke is as Z Direction of principal axis.
- 2. alternating magnetic field generating means as claimed in claim 1, it is characterised in that the solenoid coil is centrally located at seat At the origin for marking system, the axis of solenoid coil is located in the Y-axis of coordinate system.
- 3. alternating magnetic field generating means as claimed in claim 1, it is characterised in that the electromagnet iron yoke is C font structures.
- 4. alternating magnetic field generating means as claimed in claim 3, it is characterised in that the electromagnet iron yoke by silicon steel process and Into the electromagnet iron yoke length is 200mm, and width 100mm, sectional area is 20 × 20mm2；Width of air gap is 30mm.
- 5. alternating magnetic field generating means as claimed in claim 1, it is characterised in that first electromagnet coil and described Two electromagnet coils use sectional area as 1mm2Copper cash be wound on the magnetic pole of electromagnet iron yoke, first electromagnet coil Thickness with second electromagnet coil is 10mm, length 60mm.
- 6. the alternating magnetic field generating means as described in claim any one of 1-5, it is characterised in that the solenoid coil uses Sectional area is 1mm2Copper wire winding, its height is 60mm, external diameter 30mm, internal diameter 10mm；First magnetic field detecting coil External diameter is used as 0.05mm enamel-covered wire single turn coilings, its a diameter of 10mm with second magnetic field detecting coil.
- A kind of 7. alternating magnetic field production method of the alternating magnetic field generating means based on described in claim 1, it is characterised in that bag Include following step：Field frequency f and magnetic field amplitude B is set by control unit1, control two-phase synchronizing current source output frequency be f A phases and B phase sinusoidal currents, A phases and B phase sinusoidal currents are after phase detectors, by phase detectors to A phases and B phase sinusoidal currents Phase is judged, and result is fed back into control unit, and control unit is identical to two according to the testing result of phase detectors Step current source sends phase adjusted instruction, and it is 90 degree to make A phases and B phase sinusoidal currents phase difference；The A phases in two-phase synchronizing current source export to swash to the electric current that is provided in series of the first electromagnet coil and the second electromagnet coil Encourage, X-direction, the magnetic field of size sinusoidal variations are produced in air gap；The B phases in two-phase synchronizing current source export provides current excitation to solenoid coil, and Y-axis side is produced in solenoid coil To the magnetic field of size sinusoidal variations；First magnetic field detecting coil and the second magnetic field detecting coil enter to the amplitude in X-direction magnetic field and Y direction magnetic field respectively Row detection, and testing result is fed back into control unit, control unit sends instruction regulation A phases and B phases to two-phase synchro source Electric current makes magnetic field amplitude be maintained at the magnetic field amplitude B of setting1, so as to produce rotating excitation field in X/Y plane.
- 8. alternating magnetic field production method as claimed in claim 7, it is characterised in that when A phases export the advanced B of sinusoidal current phase Mutually during 90 degree of sinusoidal current of output, the circular rotating field to turn clockwise is produced in line solenoid circle center X/Y plane；When B phases, which export the advanced A phases of sinusoidal current phase, exports 90 degree of sinusoidal current, produced in line solenoid circle center X/Y plane The circular rotating field of raw rotate counterclockwise.
- A kind of 9. alternating magnetic field production method of the alternating magnetic field generating means based on described in claim 1, it is characterised in that bag Include following step：Oscillating magnetic field frequency f, oscillating magnetic field amplitude B are set by control unit1And direction of vibration, and control two-phase synchronizing current The A phases in source export DC current and B phases output frequency is f sinusoidal current, or B phases export DC current and A phases export frequency Rate is f sinusoidal current；The A phases in two-phase synchronizing current source export to swash to the electric current that is provided in series of the first electromagnet coil and the second electromagnet coil Encourage, the magnetic field of X-direction is produced in air gap；The B phases in two-phase synchronizing current source export provides current excitation to solenoid coil, and Y direction is produced in solenoid coil Magnetic field；First magnetic field detecting coil is detected to the amplitude in X-direction magnetic field or the second magnetic field detecting coil is to Y direction The amplitude in magnetic field is detected, and testing result is fed back into control unit, and control unit sends instruction to two-phase synchro source Regulation A phases or B phase currents make magnetic field amplitude be maintained at the magnetic field amplitude B of setting1；So as to produce oscillating magnetic field.
- 10. alternating magnetic field production method as claimed in claim 9, it is characterised in that when A phases export DC current, B phases export During sinusoidal current, produced in line solenoid circle center X/Y plane using X-axis as symmetry axis, the oscillating magnetic flux vibrated in Y direction ；When B phases export DC current, and A phases export sinusoidal current, can be produced in line solenoid circle center X/Y plane using Y-axis as Symmetry axis, the oscillating magnetic field vibrated in X-direction.
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| CN108037700A (en) * | 2017-12-13 | 2018-05-15 | 杭州电子科技大学 | A kind of magnetic current body controlling means |
| CN109174986B (en) * | 2018-09-05 | 2019-09-17 | 燕山大学 | A kind of auxiliary current power-up device and its application method in electro plasticity wire drawing |
| CN109541514B (en) * | 2018-12-28 | 2024-02-02 | 中国计量科学研究院 | Calibration control device and calibration device for small coil turn area for magnetic moment measurement |
| CN111952035B (en) * | 2020-07-14 | 2022-03-08 | 中国科学院电工研究所 | Swinging magnetic field generating device and control method thereof |
| CN112134468B (en) * | 2020-09-29 | 2022-03-08 | 陕西省计量科学研究院 | Alternating current phase-adjustable power supply based on rotating magnetic field |
| CN112558006B (en) * | 2020-11-30 | 2022-09-06 | 华中科技大学 | Double-triaxial electromagnetic detection and route positioning method for submarine cable |
| CN112735732B (en) * | 2020-12-10 | 2022-09-06 | 中国科学院深圳先进技术研究院 | Mixed magnetic field device and mixed magnetic field system |
| CN113075606A (en) * | 2021-04-16 | 2021-07-06 | 西安华舜测量设备有限责任公司 | Rotating magnetic field simulation device |
| CN117411275A (en) * | 2022-07-07 | 2024-01-16 | 珠海捷壹生物科技有限公司 | Miniature magnetic fluid driving device and method |
| CN115962243B (en) * | 2022-12-13 | 2023-11-07 | 华中科技大学 | Axial magnetic flux permanent magnet hysteresis damper with adjustable air gap |
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