CN107143606A - The magnetic field bidirectional modulation method of magnetic structure can be remembered for magneto-rheological vibration damper - Google Patents
The magnetic field bidirectional modulation method of magnetic structure can be remembered for magneto-rheological vibration damper Download PDFInfo
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- CN107143606A CN107143606A CN201710343548.XA CN201710343548A CN107143606A CN 107143606 A CN107143606 A CN 107143606A CN 201710343548 A CN201710343548 A CN 201710343548A CN 107143606 A CN107143606 A CN 107143606A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F7/00—Regulating magnetic variables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
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Abstract
It can remember the magnetic field bidirectional modulation method of magnetic structure the present invention relates to a kind of magneto-rheological vibration damper that is directed to, the memory characteristic in magnetic field is superimposed using aluminium nickel cobalt and Nd-Fe-B permanent magnet, by applying, transient pulse magnetic field changes permanent magnet magnetization state and its level of magnetization can be remembered, so that the magnetic induction intensity in resistance of shock absorber gap realizes the technology of bidirectional modulation.There is advantages below compared with the conventional method：It is described to remember the magnetic field bidirectional modulation method of magnetic structure for magneto-rheological vibration damper, the memory characteristic in magnetic field is produced using the permanent magnet combination that can remember different coercivitys and remanent magnetism in magnetic structure, only by applying transient pulse magnetic field i.e. achievable change and maintenance to magnetic field intensity, without outside lasting energy supply, electric energy loss is reduced, and bidirectional modulation can be carried out to the magnetic field intensity of damping clearance.
Description
Technical field
It is more particularly to a kind of to remember magnetic structure for magneto-rheological vibration damper the present invention relates to magneto-rheological vibration damping field
Magnetic field bidirectional modulation method.
Background technology
Magneto-rheological vibration damper is a kind of novel intelligent shock absorber developed by damping fluid of magnetic flow liquid.Magneto-rheological vibration damper
Damping clearance in be full of magnetic flow liquid, magneto-rheological vibration damper by change damping clearance magnetic field intensity size change it is magnetorheological
The rheology of liquid, and then change the output damping force of magneto-rheological vibration damper.
At present, the magnetic field regulating method used for the existing magnetic structure of magneto-rheological vibration damper mainly has following two：
A kind of is the magnetic structure for only relying on coil magnetization.Powered by external electrical apparatus, by changing excitation electricity
The size of stream changes the power in magnetic field, and then influences the characteristic of magnetic flow liquid, realizes the control to damping force.This method according to
Damping clearance magnetic field is maintained by exciting current, strong to external power source dependence, height is lost in energy in coil.And in zero current shape
Damping clearance magnetic field is approximately zero under state, and the small poor controllability of damping force, magnetic flow liquid is chronically at free settling under zero magnetic field state
And cohesion, therefore, it is difficult to ensure damping property.
Another is the magnetic structure for coil with the common excitation of permanent magnet.Generally there is magnet exciting coil to produce excitation field
Be superimposed with magnetic field of permanent magnet regulation magnetic field method, such as 2006《Beijing University of Technology's journal》Volume 32 the 7th phase 592~
" the inverse type MR dampers magnetic Circuit Design and experimental study " authors of page 595：The texts of Yan Weiming etc. one, are proposed under zero current condition forever
Magnet provides maximum field, is powered by magnet exciting coil and applies opposing magnetic field to gradually reduce the adjusting method of magnetic field intensity.Also
Have and magnetic field applied by coil magnetization is carried out to permanent magnet so as to the method that adjusts magnetic field, such as 2010《Engineering mechanics》27th
Roll up the 2nd phase page 228~234 " performance test of damping force bidirectionally regulation MR damper and hysteretic behavior " author：Fourth sun etc.
One text, utilizes the forward and reverse regulation that sheet Nd-Fe-B permanent magnet magnetization, demagnetization are realized with magnetic field.At present, coil and permanent magnet are common
Permanent magnet is generally single NdFeB material in the magnetic structure of excitation, and two kinds of regulative modes are required to holding by magnet exciting coil
Continue the state after power supply maintenance magnetic field is conditioned.
German Vlado professors Ostovic are most early in a kind of memory of proposition in the 36th IEEE commercial Application meeting in 2001
Motor concept.The unique magnetic Circuit Design of the motor has memory characteristic, due to permanent magnet material employ remanent magnetism it is higher and
The relatively low Al-Ni-Co permanent magnet of coercivity, by applying the filling of short time, demagnetizing current pulse in stator armature winding
The magnetized state of Al-Ni-Co permanent magnet can effectively be changed on rotor and this state is able to maintain that, low power consuming, efficiently is realized
Ground adjusts air-gap field.This memory magnetic structure is provided with its adjusting method for the magnetic field bidirectional modulation of magneto-rheological vibration damper
New thinking.
The content of the invention
The technical problem to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes that a kind of magneto-rheological vibration damper that is directed to can remember magnetic circuit knot
The magnetic field bidirectional modulation method of structure
Technical scheme
It is a kind of to remember the magnetic field bidirectional modulation method of magnetic structure for magneto-rheological vibration damper, it can remember magnetic circuit in use
In the magneto-rheological vibration damper of structure, Al-Ni-Co permanent magnet and Nd-Fe-B permanent magnet produce in damping clearance as magnetic field sources and are superimposed magnetic
, by applying the transient pulse magnetic field of certain orientation, changing the magnetized state of Al-Ni-Co permanent magnet makes it by forward and reverse magnetic
Change, strengthen or weaken therewith with the magnetic field that is superimposed of Nd-Fe-B permanent magnet, due to superposition magnetic field after transient pulse magnetic field is removed
Can memory characteristic, magnetic field maintains the state after being changed, so that the superposition magnetic induction intensity in resistance of shock absorber gap is real
Existing bidirectional modulation.The transient pulse magnetic field is passed through a pulse width in Millisecond, with 0~5Hc magnetomotive force in coil
Pulse current produce, wherein Hc be Al-Ni-Co permanent magnet coercivity, when apply some strength transient pulse magnetic field when, aluminium
The magnetized state of nickel cobalt permanent magnet is determined by the hysteresis characteristic of the Al-Ni-Co permanent magnet.
It is characterized in that：Magneto-rheological vibration damper for magnetic field bidirectional modulation method can remember magnetic structure：It is magnetorheological
Shock absorber can remember magnetic structure：Multiple coils 5, Nd-Fe-B permanent magnet 3 and aluminium nickel cobalt are provided with piston 1, along piston shaft
The structure that permanent magnet 2 is constituted, is full of magnetic flow liquid in damping clearance 4；Magnetic field bidirectional modulation step is as follows：
1st, when Al-Ni-Co permanent magnet is consistent with Nd-Fe-B permanent magnet initial magnetic field direction, in damping clearance, magnetic field is initial
Magnetic induction intensity is B1+B2：
Situation 1：Weaken the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet magnetization side to Al-Ni-Co permanent magnet
To on the contrary, its magnitude of field intensity makes Al-Ni-Co permanent magnet magnetic induction intensity reduce Δ B11；
If Δ B11<B1, then Al-Ni-Co permanent magnet is by degaussing；After effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet
Magnetic induction intensity direction is identical with inceptive direction, and magnetic induction intensity is decreased to B1-ΔB11And the level of magnetization is remembered, neodymium iron boron
It is still B that permanent magnet magnetic induction, which is not changed,2, then it is B that magnetic induction intensity, which weakens, in damping clearance2+B1-ΔB11；
If Δ B11>B1, then Al-Ni-Co permanent magnet be reversed magnetization of magnetizing；After effect is terminated in transient pulse magnetic field, aluminium nickel
Cobalt permanent magnet magnetic induction direction with it is initial when on the contrary, induction level is changed into Δ B11-B1And the level of magnetization is remembered
Recall；It is still B that Nd-Fe-B permanent magnet magnetic induction intensity, which is not changed,2, Al-Ni-Co permanent magnet is in internal piston and Nd-Fe-B permanent magnet
The closure magnetic line of force is formed, it is B that now magnetic induction intensity, which weakens, in damping clearance2-ΔB11-B1；
Situation 2：Strengthen the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet magnetization side to Al-Ni-Co permanent magnet
To consistent, its magnitude of field intensity makes Al-Ni-Co permanent magnet magnetic induction intensity increase Δ B12；When effect is terminated in transient pulse magnetic field
Afterwards, Al-Ni-Co permanent magnet magnetic induction intensity increases to B1+ΔB12And the level of magnetization is remembered；Nd-Fe-B permanent magnet magnetic induction is strong
It is still B that degree, which is not changed,2, then now magnetic induction intensity enhancing is B in damping clearance2+B1+ΔB12；
2. Al-Ni-Co permanent magnet and Nd-Fe-B permanent magnet initial magnetic field are in opposite direction
Closed magnetic field loop is formed between two permanent magnets, the initial magnetic induction intensity of damping clearance is at the beginning of two permanent magnets
Beginning magnetic induction intensity it is vector superposed, be B2-B1；
Situation 1：Weaken the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet magnetization side to Al-Ni-Co permanent magnet
To consistent, its magnitude of field intensity can make the magnetic induction intensity of Al-Ni-Co permanent magnet strengthen Δ B21；When transient pulse magnetic field is terminated
After effect, Al-Ni-Co permanent magnet magnetic induction intensity is enhanced to B1+ΔB21And the level of magnetization is remembered, Al-Ni-Co permanent magnet is kept
In magnetized state；
If B1+ΔB21≥B2, Al-Ni-Co permanent magnet is completely counterbalanced by magnetic induction intensity of the Nd-Fe-B permanent magnet in damping clearance,
Now induction level is B in damping clearance1+ΔB21-B2, damping clearance magnetic induction intensity absolute value is minimum zero；
If B1+ΔB21<B2, the closed magnetic field enhancing that Al-Ni-Co permanent magnet is formed with Nd-Fe-B permanent magnet in internal piston,
Therefore it is B that damping clearance induction level, which weakens,2-B1+ΔB21；
Situation 2：Strengthen the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet magnetization side to Al-Ni-Co permanent magnet
Δ B is reduced to its magnetic induction intensity on the contrary, its magnitude of field intensity can make Al-Ni-Co permanent magnet be magnetized by degaussing or reversely, is made22；
If Δ B22<B1, then after effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet is by degaussing, Al-Ni-Co permanent magnet
Weaken Δ B with the closure magnetic induction intensity of Nd-Fe-B permanent magnet formation22, i.e., the magnetic strength that Nd-Fe-B permanent magnet is produced in damping clearance
Intensity is answered to increase Δ B22, then magnetic induction intensity is now synthesized in damping clearance and is increased to B2-(B1-ΔB22)；
If Δ B22>B1, then after effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet is reversed magnetize magnetization, magnetic strength
Answer intensity in opposite direction with original state, size is Δ B22-B1, because Al-Ni-Co permanent magnet is no longer formed with Nd-Fe-B permanent magnet
The synthesis magnetic induction intensity of two kinds of permanent magnets is B in closed magnetic field, damping clearance2+ΔB22-B1。
The position of the Nd-Fe-B permanent magnet 3 and Al-Ni-Co permanent magnet 4 can be exchanged, i.e., Al-Ni-Co permanent magnet 4 is located at neodymium
The inner side of iron boron permanent magnet 3.
The Nd-Fe-B permanent magnet 3 mutually forms an angle setting with Al-Ni-Co permanent magnet 4.
Beneficial effect
A kind of magneto-rheological vibration damper that is directed to proposed by the present invention can remember the magnetic field bidirectional modulation method of magnetic structure, utilize
Aluminium nickel cobalt and Nd-Fe-B permanent magnet are superimposed the memory characteristic in magnetic field, and permanent magnet magnetization state is changed by applying transient pulse magnetic field
And its level of magnetization can be remembered, so that the magnetic induction intensity in resistance of shock absorber gap realizes the skill of bidirectional modulation
Art.There is advantages below compared with the conventional method：It is described to remember the two-way tune in magnetic field of magnetic structure for magneto-rheological vibration damper
Section method, the memory that utilization can remember the permanent magnet combination generation magnetic field of different coercivitys and remanent magnetism in magnetic structure is special
Property, only by applying transient pulse magnetic field i.e. achievable change and maintenance to magnetic field intensity, without outside lasting energy supply, reduce
Electric energy loss, and bidirectional modulation can be carried out to the magnetic field intensity of damping clearance.
Brief description of the drawings
Fig. 1 example magneto-rheological vibration damper profiles
The consistent magnetic field bidirectional modulation schematic diagram in Fig. 2 permanent magnets initial magnetic field direction
Fig. 3 permanent magnets initial magnetic field magnetic field bidirectional modulation schematic diagram in opposite direction
Fig. 4 Al-Ni-Co permanent magnet B-H loops
Embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
The present invention is that a kind of magneto-rheological vibration damper that is directed to can remember magnetic structure, folded using aluminium nickel cobalt and Nd-Fe-B permanent magnet
Plus the memory characteristic in magnetic field, by applying, transient pulse magnetic field changes permanent magnet magnetization state and its level of magnetization can be remembered
Firmly, so that the magnetic induction intensity in resistance of shock absorber gap realizes the technology of bidirectional modulation, it is technically characterized in that it contains
Once content：
(1) the initial magnetic field state of memory magnetic structure is determined
For ease of the discussed further of the present embodiment, Fig. 1 is example magneto-rheological vibration damper profile, and Fig. 2, Fig. 3 is in Fig. 1
The magnetic field bidirectional modulation method schematic diagram of solid frame portion magnetic structure.Shell and work of the magneto-rheological vibration damper in magnetic circuit part
Plug is permeability magnetic material.In the piston 1 of MR vibration damper, Al-Ni-Co permanent magnet 2 and Nd-Fe-B permanent magnet 3 are installed,
Magnetic flow liquid is full of in damping clearance 4.
Al-Ni-Co permanent magnet 2 has the characteristic that coercivity is relatively low and remanent magnetism is higher, and B-H loop is as shown in figure 4, in this example
Assuming that it is initially unsaturation magnetized state Q0, initial magnetic induction intensity is B1.Br represents permanent magnet mximum residual magnetism, Hc tables in figure
Show the coercivity of permanent magnet.Permanent magnet is under full magnetized state, and its operating point is with demagnetizing curve and the intersection point P of load line0Represent.
It is non-linear due to permanent-magnet material demagnetization curve so that can emerge must not coincide with demagnetizing curve, therefore it magnetizes shape
The operating point of permanent magnet just returns and rested near the level of magnetization after being changed along recoil line after state changes, that is, reaches
The purpose that permanent magnet magnetization state is remembered is arrived.
Nd-Fe-B permanent magnet 3 has the higher characteristic of coercivity, assume in this example that its initial magnetic induction intensity is B2, in arteries and veins
Magnetic induction intensity variable quantity under magnetic field is rushed to can be neglected.
By the invariable Nd-Fe-B permanent magnetic of Al-Ni-Co permanent magnet and magnetic induction intensity with magnetized state memory characteristic
Body combination is as magnetic field sources, not only initial magnetic field intensity non-zero, it is ensured that the security of shock absorber, and with to magnetic field magnetic strength
Answer the memory of intensity and maintain characteristic, be easy to the regulation to magnetic field.
2 can remember the magnetic field bidirectional modulation method of magnetic structure
The bidirectional modulation magnetic field is superimposed generation by two kinds of permanent magnets in magneto-rheological vibration damper damping clearance 4.To damping
The magnetic induction intensity in gap, which is adjusted, to be needed to apply transient pulse magnetic field to permanent magnet.Transient pulse magnetic field leads in coil 5
Enter a pulse width to produce in Millisecond, with the magnetomotive pulse currents of 0~5Hc, wherein Hc is Al-Ni-Co permanent magnet
Coercivity, when applying the transient pulse magnetic field of some strength, the magnetized state of Al-Ni-Co permanent magnet is by the Al-Ni-Co permanent magnet
Hysteresis characteristic determine.
If two permanent magnet initial magnetic fields direction are consistent, such as Fig. 2, then the initial magnetic induction intensity of damping clearance is B1+B2。
When needing to weaken the magnetic induction intensity of damping clearance, it is necessary to which Al-Ni-Co permanent magnet reaches relatively low magnetized state,
Even it is carried out reversely to magnetize to offset part Nd-Fe-B permanent magnet in the magnetic field of damping clearance.Lead in such as Fig. 2 a, coil 5
Enter with H1Magnetomotive transient current pulses generation transient pulse magnetic field, its magnetization direction magnetizes with Al-Ni-Co permanent magnet
In the opposite direction, its magnitude of field intensity can make Al-Ni-Co permanent magnet magnetic induction intensity reduce Δ B11。
If Δ B11<B1, then Al-Ni-Co permanent magnet be can see by degaussing by Fig. 4 a curves, the work of Al-Ni-Co permanent magnet
Point is i.e. from Q0Move to Q1.After pulse current is removed, Operating Point of Permanent Magnet will be along recoil line Q1R1Rise, finally stablize in P1Point.
Relatively initial operation point Q0, operating point P1Magnetized state it is lower and be held up.Now Al-Ni-Co permanent magnet magnetic strength
Answer that intensity direction is identical with inceptive direction, magnetic induction intensity is decreased to B1-ΔB11, Nd-Fe-B permanent magnet magnetic induction intensity do not changed
Become still into B2, such as Fig. 2 b, then it is B that now magnetic induction intensity, which weakens, in damping clearance2+B1-ΔB11。
If Δ B11>B1, then Al-Ni-Co permanent magnet be reversed magnetization of magnetizing, can see by Fig. 4 b curves, aluminium nickel cobalt is filled
By initial work location Q after magnetic0It is down to Q1And new operating point P is stabilized to along hysteresis curve new under the state1.Now work as wink
When pulsed magnetic field terminate after effect, Al-Ni-Co permanent magnet magnetic induction intensity direction with it is initial when on the contrary, induction level become
For Δ B11-B1And the level of magnetization is remembered.It is still B that Nd-Fe-B permanent magnet magnetic induction intensity, which is not changed,2, Al-Ni-Co permanent magnet
In internal piston and the Nd-Fe-B permanent magnet formation closure magnetic line of force, such as Fig. 2 c, now magnetic induction intensity decrease is in damping clearance
B2-ΔB11-B1。
When needing to strengthen the magnetic induction intensity of damping clearance, the magnetized state of Al-Ni-Co permanent magnet, this example pair need to be improved
Al-Ni-Co permanent magnet carries out saturation and magnetized.It is passed through in such as Fig. 2 d, coil 5 with the magnetomotive transient current pulses generations of 2~5Hc
One transient pulse magnetic field, its magnetic field intensity H2Direction is consistent with the Al-Ni-Co permanent magnet direction of magnetization.After pulse current is removed, by
Fig. 4 a curves can see, and the operating point of Al-Ni-Co permanent magnet will reach along limit hysteresis curve and stably in full magnetization work
State P0Point, with respect to initial work location Q0, operating point P0Magnetized state it is higher.Now, such as Fig. 2 e, Al-Ni-Co permanent magnet is in resistance
The magnetic induction intensity in Buddhist nun gap increases to B1+ΔB11, Nd-Fe-B permanent magnet magnetic induction intensity is still B2, then now in damping clearance
Magnetic induction intensity enhancing is B2+B1+ΔB11。
If two permanent magnet initial magnetic fields are in opposite direction, such as Fig. 3 can form closed magnetic field loop between two permanent magnets.B1、
B2The initial magnetic induction intensity of Al-Ni-Co permanent magnet and Nd-Fe-B permanent magnet is still represented, therefore damping clearance is superimposed initial magnetic induction
Intensity is B2-B1。
When needing to weaken the magnetic induction intensity of damping clearance, the magnetized state of Al-Ni-Co permanent magnet need to be improved to offset neodymium
The magnetic field of iron boron permanent magnet.Such as Fig. 3 a.
One transient pulse magnetic field of transient current pulses generation with 2~5Hc magnetomotive force sizes is passed through in coil 5,
Make its magnetic field intensity H1Direction is consistent with the Al-Ni-Co permanent magnet direction of magnetization, then Al-Ni-Co permanent magnet, which is saturated, magnetizes.Pulse electricity
After stream is removed, Al-Ni-Co permanent magnet magnetic induction intensity is enhanced to B1+ΔB21。
If B1+ΔB21=B2, such as Fig. 3 b, then Al-Ni-Co permanent magnet be completely counterbalanced by magnetic of the Nd-Fe-B permanent magnet in damping clearance
Induction, therefore damping clearance magnetic field intensity is attenuated to 0.
If B1+ΔB21<B2, such as Fig. 3 c, the closed magnetic that Al-Ni-Co permanent magnet is formed with Nd-Fe-B permanent magnet in internal piston
Field enhancing, therefore it is B that damping clearance induction level, which weakens,2-B1+ΔB21。
When needing to strengthen the magnetic induction intensity of damping clearance, it is necessary to which Al-Ni-Co permanent magnet reaches relatively low magnetized state,
Such as Fig. 3 d.It is passed through in coil 5 with H1One transient pulse magnetic field of transient current pulses generation of magnetomotive force size, makes its magnetic field
Intensity H1After direction and the Al-Ni-Co permanent magnet direction of magnetization are on the contrary, pulse current removes, its magnetic induction intensity reduces Δ B11。
If Δ B11<B1, such as Fig. 4 (a), Al-Ni-Co permanent magnet is formed by degaussing, Al-Ni-Co permanent magnet with Nd-Fe-B permanent magnet
Closure magnetic induction intensity weaken Δ B11, such as Fig. 3 e are that Nd-Fe-B permanent magnet increases Δ in the magnetic induction intensity that damping clearance is produced
B11, then magnetic induction intensity is now synthesized in damping clearance and is increased to B2-(B1-ΔB11)。
If Δ B11>B1, such as Fig. 4 (b), Al-Ni-Co permanent magnet is reversed magnetization of magnetizing, magnetic induction intensity and original state side
To on the contrary, size is Δ B11-B1, such as Fig. 3 f, because Al-Ni-Co permanent magnet no longer forms closed magnetic field, resistance with Nd-Fe-B permanent magnet
The synthesis magnetic induction intensity of two kinds of permanent magnets is B in Buddhist nun gap2+ΔB11-B1。
The excursion of magnetic induction intensity all should expire sustainable magnetic current and liquid flow variation characteristic in damping clearance described above
Magnetic induction intensity scope.
Claims (3)
1. a kind of can remember the magnetic field bidirectional modulation method of magnetic structure for magneto-rheological vibration damper, it is characterised in that：It is magnetorheological
Shock absorber can remember magnetic structure：In the piston (1), along piston shaft provided with multiple coils (5), Nd-Fe-B permanent magnet (3) and
The structure of Al-Ni-Co permanent magnet (2) composition, is full of magnetic flow liquid in damping clearance (4)；Magnetic field bidirectional modulation step is as follows：
1st, when Al-Ni-Co permanent magnet is consistent with Nd-Fe-B permanent magnet initial magnetic field direction, in damping clearance, the initial magnetic strength in magnetic field
It is B to answer intensity1+B2：
Situation 1：Weaken the magnetic induction intensity in magnetic field
One transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet direction of magnetization phase are applied to Al-Ni-Co permanent magnet
Instead, its magnitude of field intensity makes Al-Ni-Co permanent magnet magnetic induction intensity reduce Δ B11；
If Δ B11<B1, then Al-Ni-Co permanent magnet is by degaussing；After effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet magnetic strength
Answer that intensity direction is identical with inceptive direction, magnetic induction intensity is decreased to B1-ΔB11And the level of magnetization is remembered, Nd-Fe-B permanent magnetic
It is still B that body magnetic induction intensity, which is not changed,2, then it is B that magnetic induction intensity, which weakens, in damping clearance2+(B1-ΔB11)；
If Δ B11>B1, then Al-Ni-Co permanent magnet be reversed magnetization of magnetizing；After effect is terminated in transient pulse magnetic field, aluminium nickel cobalt is forever
Magnet magnetic induction intensity direction with it is initial when on the contrary, induction level is changed into Δ B11-B1And the level of magnetization is remembered；Neodymium
It is still B that iron boron permanent magnet magnetic induction, which is not changed,2, Al-Ni-Co permanent magnet closes in the formation of internal piston and Nd-Fe-B permanent magnet
The magnetic line of force is closed, it is B that now magnetic induction intensity, which weakens, in damping clearance2-(ΔB11-B1)；
Situation 2：Strengthen the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and the Al-Ni-Co permanent magnet direction of magnetization one to Al-Ni-Co permanent magnet
Cause, its magnitude of field intensity makes Al-Ni-Co permanent magnet magnetic induction intensity increase Δ B12；After effect is terminated in transient pulse magnetic field, aluminium
Nickel cobalt permanent magnet magnetic induction increases to B1+ΔB12And the level of magnetization is remembered；Nd-Fe-B permanent magnet magnetic induction intensity is not
Be changed still is B2, then now magnetic induction intensity enhancing is B in damping clearance2+(B1+ΔB12)；
2. Al-Ni-Co permanent magnet and Nd-Fe-B permanent magnet initial magnetic field are in opposite direction
Closed magnetic field loop is formed between two permanent magnets, the initial magnetic induction intensity of damping clearance is two initial magnetic of permanent magnet
Induction it is vector superposed, be B2-B1；
Situation 1：Weaken the magnetic induction intensity in magnetic field
Apply a transient pulse magnetic field, its magnetization direction and the Al-Ni-Co permanent magnet direction of magnetization one to Al-Ni-Co permanent magnet
Cause, its magnitude of field intensity can make the magnetic induction intensity of Al-Ni-Co permanent magnet strengthen Δ B21；When effect is terminated in transient pulse magnetic field
Afterwards, Al-Ni-Co permanent magnet magnetic induction intensity is enhanced to B1+ΔB21And the level of magnetization is remembered, Al-Ni-Co permanent magnet is maintained at magnetic
Change state；
If B1+ΔB21≥B2, Al-Ni-Co permanent magnet is completely counterbalanced by magnetic induction intensity of the Nd-Fe-B permanent magnet in damping clearance, now
Induction level is B in damping clearance1+ΔB21-B2, damping clearance magnetic induction intensity absolute value is minimum zero；
If B1+ΔB21<B2, Al-Ni-Co permanent magnet strengthens with Nd-Fe-B permanent magnet in the closed magnetic field that internal piston is formed, therefore resistance
It is B that Buddhist nun gap induction level, which weakens,2-(B1+ΔB21)；
Situation 2：Strengthen the magnetic induction intensity in magnetic field
One transient pulse magnetic field, its magnetization direction and Al-Ni-Co permanent magnet direction of magnetization phase are applied to Al-Ni-Co permanent magnet
Instead, its magnitude of field intensity can make Al-Ni-Co permanent magnet be magnetized by degaussing or reversely, its magnetic induction intensity is reduced Δ B22；
If Δ B22<B1, then after effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet is by degaussing, Al-Ni-Co permanent magnet and neodymium
The closure magnetic induction intensity of iron boron permanent magnet formation weakens Δ B22, i.e. Nd-Fe-B permanent magnet is strong in the magnetic induction that damping clearance is produced
Degree increase Δ B22, then magnetic induction intensity is now synthesized in damping clearance and is increased to B2-(B1-ΔB22)；
If Δ B22>B1, then after effect is terminated in transient pulse magnetic field, Al-Ni-Co permanent magnet is reversed magnetization of magnetizing, and magnetic induction is strong
Degree is in opposite direction with original state, and size is Δ B22-B1, because Al-Ni-Co permanent magnet is no longer closed with Nd-Fe-B permanent magnet formation
The synthesis magnetic induction intensity of two kinds of permanent magnets is B in magnetic field, damping clearance2+(ΔB22-B1)。
2. the magnetic field bidirectional modulation method of magnetic structure can be remembered for magneto-rheological vibration damper according to claim 1, it is special
Levy and be：The Nd-Fe-B permanent magnet (3) and the position of Al-Ni-Co permanent magnet (4) can be exchanged, i.e. Al-Ni-Co permanent magnet (4) position
Inner side in Nd-Fe-B permanent magnet (3).
3. the magnetic field bidirectional modulation method of magnetic structure can be remembered for magneto-rheological vibration damper according to claim 1, it is special
Levy and be：The Nd-Fe-B permanent magnet (3) mutually forms an angle setting with Al-Ni-Co permanent magnet (4).
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| CN201710343548.XA Active CN107143606B (en) | 2017-05-16 | 2017-05-16 | The magnetic field bidirectional modulation method of magnetic structure can be remembered for magneto-rheological vibration damper |
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| CN112967857A (en) * | 2020-04-17 | 2021-06-15 | 北京中科三环高技术股份有限公司 | Permanent magnet device |
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