CN219248016U - Moving-magnetic vibrator with coil magnetic parallel nonlinear term offset - Google Patents
Moving-magnetic vibrator with coil magnetic parallel nonlinear term offset Download PDFInfo
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- CN219248016U CN219248016U CN202222530237.3U CN202222530237U CN219248016U CN 219248016 U CN219248016 U CN 219248016U CN 202222530237 U CN202222530237 U CN 202222530237U CN 219248016 U CN219248016 U CN 219248016U
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Abstract
The coil magnetic parallel nonlinear item counteracted moving magnetic vibrator comprises a moving magnetic vibrator body, wherein the moving magnetic vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator component and a rotor component, the stator component comprises a coil combination structure, the rotor component comprises a magnet combination structure, the stator component is fixed in the outer cylinder, the vibration transmission sheet is fixed on the outer cylinder, the rotor component is fixedly connected with the vibration transmission sheet through at least one position, and the coils are arranged inside and the permanent magnets are arranged outside when the center is seen outwards; the number of the permanent magnets is N Magnetic field The number of coils is N Ring(s) ，N Magnetic field >N Ring(s) Or N Magnetic field ＜N Ring(s) ；N Magnetic field 1,2,3, …,100; n (N) Ring(s) 1,2,3, …,100; dynamic movementThe inside of the magnetic vibrator body is provided with 2N magnetic domains D which are designed in pairwise symmetry 1,i And D 2,i N is 1,2,3, …,100, i=1, 2,3, … so that the nonlinear terms cancel each other in the final resultant, leaving only the linear term portion for the current.
Description
Technical Field
The utility model relates to the technical field of vibrators, in particular to a coil magnetic parallel nonlinear term offset moving magnetic vibrator.
Background
The vibrator and or the tactile feedback actuator design of the bone conduction earphone have various advantages, such as better heat dissipation of the coil part and no heating of the rotor component serving as a load; the coil is of a hollow shaft design, and the magnet is positioned inside, so that the whole structure is more compact; in addition, since the coil is stationary, there is no disadvantage in that the coil connection wire is easily damaged. In addition, the design of the moving magnet can allow Gao Fengli values, gao Fengli values and moving mass ratio, so that the moving magnet has higher acceleration G value.
In the existing vibrator design of moving magnetic mode, because of a certain defect in the design of the combination mode of the magnet and the coil, a relatively high nonlinear term, namely a stress or acceleration value of the rotor assembly, is often generated, and relatively high distortion, namely total harmonic distortion THD (total harmonic distortion), occurs in a low frequency or high frequency band, and fig. 16 is a total harmonic distortion THD test chart of the existing vibrator of moving magnetic mode, and it can be seen that the distortion reaches 99% near 25hz and 46% near 100 hz. Such large distortion indicates that near low frequencies, distortion of the audio signal or haptic feedback signal results in substantial perception of sound quality and haptic feedback and substantial ingress and egress. In general, when the distortion is more than 10%, the standard of the slave audio is unacceptable.
Disclosure of Invention
The utility model aims to provide a moving magnetic vibrator with coil magnetic parallel nonlinear term cancellation.
The technical scheme of the utility model is as follows: the coil magnetic parallel nonlinear item counteracted moving magnetic vibrator comprises a moving magnetic vibrator body, wherein the moving magnetic vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator component and a rotor component, the stator component comprises a coil combination structure, the rotor component comprises a magnet combination structure, the stator component is fixed in the outer cylinder, the vibration transmission sheet is fixed on the outer cylinder, the rotor component is fixedly connected with the vibration transmission sheet through at least one position, the coil is arranged inside, and the permanent magnet is arranged outside when the center is seen from the outside; the number of the permanent magnets is N Magnetic field The number of coils is N Ring(s) ，N Magnetic field >N Ring(s) Or N Magnetic field ＜N Ring(s) ； N Magnetic field 1,2,3, …,100; n (N) Ring(s) 1,2,3, …,100; the inside of the moving magnetic vibrator body is provided with 2N magnetic domains D which are designed in pairwise symmetry 1,i And D 2,i N is 1,2,3, …,100, i=1, 2,3, …; the main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,i And D 2,i And in magnetic domain D 1,i In the magnetic field D, the magnetic force line direction of the coil is the same as that of the permanent magnet 2,i Wherein the magnetic force line direction of the coil is opposite to the magnetic force line direction of the permanent magnet; or in the magnetic domain D 1,i Wherein the magnetic force lines of the coil are opposite to the magnetic force lines of the permanent magnet, and are in the magnetic field D 2,i The magnetic force line direction of the coil is the same as the magnetic force line direction of the permanent magnet.
The utility model provides the coil magnetic parallel nonlinear term offset moving magnetic vibrator through improvement, and compared with the prior art, the coil magnetic parallel nonlinear term offset moving magnetic vibrator has the following improvement and advantages:
1. the coil magnetic parallel nonlinear term counteracted moving magnetic vibrator can counteract nonlinear terms of vibrator coil current in the driving force born by the rotor component or the acceleration of the rotor component through a symmetrical or asymmetrical design, so that the nonlinear terms can be counteracted with each other in the final resultant force, only linear term parts aiming at the current are left, distortion of the vibrator is greatly reduced, and fidelity of the vibrator to an original audio signal or a tactile feedback signal is improved.
2. The total harmonic distortion in the low frequency band is greatly reduced from 99% of the original peak value to below 15% of the peak value, and the improvement is obvious.
3. The reduction of the distortion curve is equivalent to the reduction of the resonant frequency of the vibrator system from the other aspect, so that the tone quality is better. In addition, the sensitivity of the vibrator system can be equivalently improved and the power consumption can be reduced.
Drawings
The utility model is further explained below with reference to the drawings and examples:
FIG. 1 is a cross-sectional view of embodiment 1 of the present utility model;
FIG. 2 is a closed curve of magnetic lines of force of the coil and the permanent magnet of example 1 of the present utility model;
FIG. 3 is a magnetic domain analysis chart of example 1 of the present utility model;
FIG. 4 is a diagram of the relationship between magnetic domains and stator assembly of embodiment 1 of the present utility model;
FIG. 5 is a force analysis diagram of a mover assembly of embodiment 1 of the present utility model;
FIG. 6 is a cross-sectional view of embodiment 2 of the present utility model;
FIG. 7 is a closed magnetic field line curve of the coil and the permanent magnet according to example 2 of the present utility model;
FIG. 8 is a magnetic domain analysis chart of example 2 of the present utility model;
FIG. 9 is a diagram of the relationship between magnetic domains and stator assemblies of embodiment 2 of the present utility model;
FIG. 10 is a force analysis diagram of a mover assembly of embodiment 2 of the present utility model;
FIG. 11 is a cross-sectional view of embodiment 3 of the present utility model;
FIG. 12 is a closed magnetic field line curve of the coil and the permanent magnet of example 3 of the present utility model;
FIG. 13 is a magnetic domain analysis chart of example 3 of the present utility model;
FIG. 14 is a graph of the relationship between magnetic domains and stator assemblies of embodiment 3 of the present utility model;
FIG. 15 is a force analysis diagram of a mover assembly of embodiment 3 of the present utility model;
fig. 16 is a graph of a total harmonic distortion THD test of a prior art moving magnet vibrator;
fig. 17 is a total harmonic distortion THD test chart of the moving magnet vibrator of embodiment 1.
Detailed Description
The following detailed description of the present utility model clearly and fully describes the technical solutions of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The ring magnets are connected in parallel: the arrangement direction of the permanent magnet and the coil is parallel to the vibration direction of the vibrator when seen along the vibration direction of the vibrator, and the coil is inside when seen from the center to outside, namely the coil magnetic parallel connection type permanent magnet is formed.
For the nonlinear term cancellation design, 2N groups of magnetic domains exist in the vibrator, and the magnetic domains are combined in pairs and defined as magnetic domain D 1,i And D 2,i . Where i=1, 2,3, …, N. The main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic force acting domain D 1,i And D 2,i And in magnetic domain D 1,i In the magnetic field D, the magnetic force line direction of the coil is the same as that of the permanent magnet 2,i The magnetic force line direction of the coil is opposite to the magnetic force line direction of the permanent magnet. Or in the magnetic domain D 1,i In the magnetic field D, the magnetic force line direction of the coil is opposite to that of the permanent magnet 2,i The magnetic force line direction of the coil is the same as the magnetic force line direction of the permanent magnet.
When the direction of magnetic force lines of the coil passing through a certain magnetic field is the same as the direction of magnetic force lines of the permanent magnet, the total magnetic flux is equal to the sum of the magnetic flux generated by the coil and the magnetic flux generated by the permanent magnet. When the direction of magnetic force lines of the coil passing through a certain magnetic field is the same as that of the permanent magnet, the total magnetic flux is equal to the difference between the magnetic flux generated by the coil and the magnetic flux generated by the permanent magnet.
Magnetic domain: the coil magnetic parallel nonlinear term counteracted moving magnetic vibrator comprises at least one magnetic force acting domain. By magnetic field is meant a region of space within which there is an electromagnetic field or fields such that interaction forces occur between the components surrounding the magnetic field, which we define as the magnetic field. The magnetic domain is a space region where magnetic force interacts, and is generally composed of a space region (generating attraction or repulsion interaction) between a permanent magnet and a permanent magnet, or a space region (generating attraction interaction) enclosed between a permanent magnet and a magnetizer, or a space region enclosed between magnetizers (yokes) magnetized by a permanent magnet, or a space region where magnetic force interactions occur inside a permanent magnet (the permeability of a hard magnetic material constituting a permanent magnet is close to that of air).
In general, there are two types of magnetic fields currently available, the first type of magnetic field being a magnetic field enclosed by the interior of the mover assembly or the interior of the stator assembly; the second type is a magnetic force acting field enclosed between the rotor assembly and the stator assembly. Therefore, through analysis of the second magnetic force acting domain, stress analysis of the rotor assembly can be obtained, so that resultant force of the rotor assembly of the vibrator system can be obtained, and a vibration equation of the resultant force can be further given.
Example 1
Referring to fig. 1-5, a coil magnetic parallel nonlinear item counteracted moving magnetic vibrator comprises a moving magnetic vibrator body 11, wherein the moving magnetic vibrator body 11 comprises an outer cylinder 1, a vibration transmitting sheet 8, a stator component and a rotor component, the stator component comprises a coil combination structure, the rotor component comprises a magnet combination structure, the coil combination structure comprises a coil 3 and a first magnetizer 4, the magnet combination structure comprises a permanent magnet 6 and a second magnetizer 4, the stator component is fixed in the outer cylinder 1, the vibration transmitting sheet 8 is fixed on the outer cylinder 1, the rotor component and the vibration transmitting sheet 8 are fixedly connected through at least one position, wherein the rotor component moves, the stator component is fixed, and the rotor component is called a moving part;
the vibration transmitting sheet 8 can be rectangular, round, runway-shaped or three-dimensional according to different application scenes, and can be matched for use according to different application scenes; the vibration-transmitting plate 8 is usually fixed on the top surface, the bottom surface, or in the middle of the outer cylinder 1.
The stator component is fixed in the outer cylinder 1 and can be arranged on the inner side wall, the top surface or the bottom surface of the outer cylinder 1;
the mover assembly is fixedly connected with the vibration transmission sheet 8 through at least one site, wherein the site comprises point contact and surface contact, and the site can be one site, two sites or a plurality of sites.
The rotor component and the stator component are in concave-convex staggered occlusion arrangement, and the main magnetic force line closed curve of the coil 3 and the main magnetic force line closed curve of the permanent magnet 6 respectively and alternately pass through the rotor component and the stator component:
the permanent magnet 6 is outside, the coil 3 is inside, N Magnetic field =2, the polarities of the two opposite end faces adjacent to the permanent magnet are the same.
A magnetizer is used at a position, close to the shell, of the coil 3, so that the magnetic resistance of a magnetic circuit of the electromagnet formed by the coil 3 is as small as possible; the permanent magnets 6 in the magnet assembly are isolated by a magnetizer; yoke iron is used around the coil 3 and the permanent magnet 6, or magnetic conductive outer cylinder is used for the coil assembly and the housing close to the coil 3.
The outer cylinder 1 can be a magnetic conductive outer cylinder or a non-magnetic conductive outer cylinder, and the magnetic conductive outer cylinder is preferable for reducing magnetic resistance; the cross section of the outer cylinder can be round, square, or irregular, and can be continuous or discontinuous, such as columnar connection or grid-like discontinuity.
The coil combination structure further comprises a first magnetic conduction ring 2, the coils 3 are arranged outside, the permanent magnets 6 are arranged inside, one permanent magnet 6 is arranged inside, two coils 3 are arranged, the directions of currents in adjacent coils 3 are opposite, the polarities of electromagnetic fields of adjacent two end faces are the same, two vibration transmission sheets 7 are arranged, two vibration transmission sheets 7 are respectively fixed on the top surface and the bottom surface of the outer cylinder 1, the permanent magnets 6 are fixed in the second magnetic conduction ring 5, two ends of the second magnetic conduction ring 5 are respectively fixed on the vibration transmission sheets 7, the first magnetic conduction ring 4 is fixed in the middle part of the inner side wall of the outer cylinder 1, two coils 3 are respectively fixed on two sides of the first magnetic conduction ring 4, the first magnetic conduction ring 2 is fixedly arranged on the outer side of the two coils 3, the coils 3 and the first magnetic conduction ring 2 are both fixed on the inner side wall of the outer cylinder 1, the rotor assembly and the stator assembly are in a concave-convex staggered arrangement, the two ends of the coils 3 and the stator assembly are respectively fixed on the inner side wall of the outer side of the outer cylinder 1, and the two magnetic force lines of the stator assembly alternately pass through the main magnetic lines of the main rotor assembly and the main magnetic force lines 6 and the main magnetic line assembly alternately pass through the main magnetic line assembly and the stator assembly alternatelyThe inside of the moving magnetic vibrator body is provided with 2 magnetic domains D which are designed in pairwise symmetry 1,1 And D 2,1 The main magnetic force line closed curve of the coil 3 and the main magnetic force line closed curve of the permanent magnet 6 respectively pass through the magnetic domain D 1,1 And D 2,1 And in magnetic domain D 1,1 In which the magnetic force lines of the coil 3 are in the same direction as those of the permanent magnet 6, and in the magnetic field D 2,1 The magnetic force lines of the coil 3 are opposite to the magnetic force lines of the permanent magnet 6.
In order to further explain the design method of the nonlinear term-offset moving-magnetic vibrator, please refer to fig. 2 and 3, the air gap 1 forms a magnetic force acting domain D 1,1 The air gap 2 forms a magnetic force acting domain D 2,1 . In the magnetic force action field, the magnetic field generated by the permanent magnet 6 and the magnetic field generated by the electromagnet of the coil 3 are mutually overlapped to generate total magnetic flux/magnetic induction intensity, so that the components around the magnetic field generate interaction force.
Through coil C 1 And the current through coil C 2 I, but coil C 1 Medium current direction and coil C 2 The current direction is opposite. Assume coil C 1 The corresponding magnetic flux is phi i1 Coil C 2 The corresponding magnetic flux is phi i2 The magnetic flux corresponding to the permanent magnet is phi m . In the magnetic domain D 1 (magnetic force scope D) 1 ) In coil C 1 The corresponding magnetic force line direction is the same as the magnetic force line direction corresponding to the permanent magnet, thus in the magnetic domain D 1 Wherein the total magnetic flux is phi i1 And phi is m Is added to the value of (a). In the magnetic domain D 2 (magnetic force scope D) 2 ) In coil C 2 The corresponding magnetic force line direction is opposite to the corresponding magnetic force line direction of the permanent magnet, thus the magnetic field D 2 Wherein the total magnetic flux is phi i2 And phi is m Is a reduction of (2). Assuming that the magnetic force line direction of the permanent magnet 6 is positive in each magnetic domain, there are:
Φ D1 ＝Φ m +Φ i1
Φ D2 ＝Φ m -Φ i2
assume upper coil 1 and coil 2 currentsThe magnetic paths formed by the generated electromagnetic fields have the magnetic resistances Z respectively i1 And Z i2 N is the number of turns of the coil, i is the current intensity, and then:
because of coil C 1 And C 2 Is of symmetrical design, so Z i1 ＝Z i2 ＝Z i Therefore there are
In addition, it is assumed that the magnetic path formed by the electromagnetic field generated by the current has a flux guide G i The following steps are:
the magnetic flux corresponding to the permanent magnet 6 may be expressed by a magnetic induction intensity formula. Assuming that the magnetic induction intensity of the end face of the permanent magnet pole is B m The area of the end face of the magnetic pole is S m It is possible to obtain,
thereby having the following characteristics
Referring to fig. 2, fig. 2 is a graph showing the closed curve of magnetic lines of force of the coil C1, the coil C2 and the permanent magnet. In the figure, the closed magnetic force lines generated by the coil C1 pass through the magnetic gap D1, the closed magnetic force lines generated by the coil C1 pass through the magnetic gap D2, and the closed magnetic force lines generated by the permanent magnet pass through the magnetic gap D1 and the magnetic gap D2 in sequence.
Referring to FIG. 3, the mover assembly of FIG. 3, magnetic domain D 1,1 ，D 2,1 And stator assemblyAnd (5) a relation diagram of the parts. In the magnetic domain D 1,11 The middle rotor assembly receives a rightward suction force F from the stator assembly 1 In the magnetic domain D 1,1 The middle rotor assembly receives a leftward suction force F from the stator assembly 2 When the right direction is the positive direction, the resultant force of the stator components received by the rotor component is F 1 -F 2 。
Referring to fig. 5, fig. 5 is a force analysis diagram of the mover assembly isolated from each other, the mover assembly receives force from the stator assembly, respectively suction force F to the right 1 And suction force F to the left 2 The resultant force is F 1 -F 2 。
F Moving magnet ＝F 1 -F 2
The formula of the electromagnetic force generated by each magnetic domain is further deduced. The electromagnetic attraction force acting on the magnetized ferromagnetic object is proportional to the total area of the magnetic lines passing through the magnetic poles and the square of the magnetic induction. If the magnetic induction B is uniformly distributed along the pole surface and the calculated air gap length is small, the formula for calculating the electromagnetic attraction force is calculated by Maxwell Wei Gong, which
The expression is:
f electromagnetic attraction force
B magnetic flux density (Magnetic flux density) or magnetic induction intensity
S: magnetic force line passing through magnetic pole area
μ 0 : permeability of air
C: the pole end face combination type and shape correlation coefficient have different values for different scenes. C if the force is generated between the permanent magnet and the permanent magnet m2m Usually, the value is 1, and an accurate value is obtained through actual measurement in the actual design process; if permanent magnetA force between the iron and the magnetic iron (yoke), C m2y Usually, the value is 1/2, and an accurate value is obtained through actual measurement in the actual design process; if the force between the magnet (yoke) and the magnet (yoke) is the force, C y2y Usually, the value is 1/4, and the accurate value is obtained through actual measurement in the actual design process.
The above formula is used to calculate the electromagnetic attraction force in the above magnetic fields 1 and 2 as follows:
wherein S is D1 ，S D2 The areas of the annular end faces corresponding to the magnetic domains 1 and 2 respectively, and S D1 ＝S D1 ＝S D . Thus, there are:
the method comprises the following steps:
because of
F Moving magnet ＝F 1 -F 2
Then there is
F Dynamic magnet, linear ＝F Dynamic magnet, linear +F Dynamic magnet, nonlinear
Will F 1,linear ，F 2,linear ，F 1,nonlinear ，F 1,nonlinear Substituted into F Dynamic magnet, linear And F Dynamic magnet, nonlinear The calculation is as follows:
because of
Thus, there are:
likewise calculate F Dynamic magnet, nonlinear ，
So that the resultant force of the moving magnet as the moving member is:
from the above derivation, the following features can be seen:
1) In the resultant linear term F Dynamic magnet, linear In component F 1,linear And F 2,linear The respective linear terms are superimposed separately so that the resultant linear term F Dynamic magnet, linear And the coil current is larger.
2) In the resultant nonlinear term F Dynamic magnet, nonlinear In component F 1,nonlinear And F 2,nonlinear The respective nonlinear terms cancel each other out so that the resultant nonlinear term F Dynamic magnet, nonlinear Zero.
The above structure is called a coil magnetic parallel nonlinear term cancellation moving magnetic vibrator. This structure can be applied not only to a vibrator but also to a stopper, and a moving magnet vibrator or stopper using the above structure is also called a coil magnetic parallel nonlinear term canceling moving magnet vibrator or stopper.
Referring to fig. 17, it can be seen that the total harmonic distortion in the low frequency band is greatly reduced from 99% of the original peak value to less than 15% of the peak value, and the improvement is obvious.
The reduction of the distortion curve is equivalent to the reduction of the resonant frequency of the vibrator system from the other aspect, so that the tone quality is better. In addition, the sensitivity of the vibrator system can be equivalently converted into the improvement and the reduction of the power consumption
Example 2
Referring to fig. 6-10, a coil magnetic parallel nonlinear item counteracted moving magnetic vibrator comprises a moving magnetic vibrator body 11, wherein the moving magnetic vibrator body 11 comprises an outer cylinder 1, a vibration transmitting sheet 8, a stator component and a rotor component, the stator component comprises a coil combination structure, the rotor component comprises a magnet combination structure, the coil combination structure comprises a coil 3 and a first magnetizer 7, the magnet combination structure comprises a permanent magnet 6 and a second magnetizer 4, the stator component is fixed in the outer cylinder 1, the vibration transmitting sheet 8 is fixed on the outer cylinder 1, the rotor component and the vibration transmitting sheet 8 are fixedly connected through at least one position, wherein the rotor component moves, the stator component is fixed, and the rotor component is called a moving part;
the rotor component and the stator component are in concave-convex staggered occlusion arrangement, and the main magnetic force line closed curve of the coil 3 and the main magnetic force line closed curve of the permanent magnet 6 respectively and alternately pass through the rotor component and the stator component:
a magnetizer is used at the position of the coil 3 close to the shell, so that the magnetic resistance of the magnetic circuit of the electromagnet 6 formed by the coil 3 is as small as possible; the permanent magnets 6 in the magnet assembly are isolated by a magnetizer; yoke iron is used around the coil 3 and the permanent magnet 6, or magnetic conductive outer cylinder is used for the coil assembly and the housing close to the coil.
The coil combination structure further comprises a first magnetic conduction ring 5, the magnet combination structure further comprises a second magnetic conduction ring 2, the coil 3 is arranged inside, the permanent magnets 6 are arranged outside, the number of the permanent magnets 6 is two, the number of the coils 3 is one, polarities of two opposite end faces adjacent to the permanent magnets 6 are the same, the vibration transmission sheet 8 is provided with one, and the vibration transmission sheet 8 is fixed on the top surface of the outer cylinder 1; in order to reduce the magnetic resistance, the outer cylinder 1 is preferably a magnetically conductive outer cylinder.
One end of the first magnetizer 7 is fixed on the bottom surface of the outer cylinder 1, the coil 3 is fixed on the first magnetizer 7 in a surrounding mode, the first magnetic conductive ring 5 is fixed at one end of the first magnetizer 7, the vibration transmission support 9 is L-shaped, the horizontal part of the vibration transmission support 9 is parallel to the vibration direction, the second magnetizer 4 is fixed on the horizontal part of the vibration transmission support 9, the permanent magnets 6 are fixedly arranged on two sides of the second magnetizer 4, the two permanent magnets 4 are fixed on the horizontal part of the vibration transmission support 9, the rotor component and the stator component are in a concave-convex staggered occlusion arrangement, the main magnetic force line closing curve of the coil 3 and the main magnetic force line closing curve of the permanent magnets 6 respectively and alternately pass through the rotor component and the stator component, and 2 magnetic fields D which are designed in a two-by-two symmetrical mode are arranged inside the movable magnetic vibrator body 1,1 And D 2,1 The main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,1 And D 2,1 In the magnetic domain D 1,1 Wherein the magnetic force lines of the coil 3 are opposite to the magnetic force lines of the permanent magnet 6, and are in the magnetic domain D 2,1 The magnetic force line direction of the coil 3 is the same as the magnetic force line direction of the permanent magnet 6.
To further describe the coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator, referring to FIG. 8, the air gap 1 forms a magnetic field D 1，1 The air gap 2 forms a magnetic force acting domain D 2,1 Form domain pair d= (D) 1,1 ，D 2,1 ). In the magnetic force action field, the magnetic field generated by the permanent magnet 6 and the magnetic field generated by the electromagnet of the coil 3 are mutually overlapped to generate total magnetic flux/magnetic induction intensity, so that the components around the magnetic field generate interaction force.
Consider the magnetic domain pair d= (D) 1,1 ，D 2,1 ). Assuming that the current through the coil is i, the corresponding magnetic flux of the coil is Φ i . Permanent magnet M 1 The corresponding magnetic flux is phi m1 Permanent magnet M 2 The corresponding magnetic flux is phi m2 . In the magnetic domain D 1,1 (magnetic force scope D) 1，1 ) In the magnetic force line direction corresponding to the coil C and the permanent magnet M 1 The corresponding magnetic lines of force are opposite in direction and therefore in the magnetic domain D 1,1 Wherein the total magnetic flux is phi i And phi is m1 Is a difference in (c). In the magnetic domain D 2,1 (magnetic force scope D) 2,1 ) In the magnetic force line direction corresponding to the coil and the permanent magnet M 2 The corresponding magnetic lines of force are opposite in direction and therefore in the magnetic domain D 2,1 Wherein the total magnetic flux is phi i And phi is m2 Is added to the value of (a). Since the magnetic field formed by the permanent magnet is static, assuming that the direction of magnetic lines of force of the permanent magnet is positive, the magnetic flux is also positive, there are:
Φ D1，1 ＝Φ m1 -Φ i
Φ D2,1 ＝Φ m2 +Φ i
let the magnetic resistance of the magnetic circuit formed by the electromagnetic field generated by the upper coil current i be Z i N is the number of turns of the coil, i is the current intensity, and then:
assuming that the magnetic path formed by the electromagnetic field generated by the current has a flux guide G i The following steps are:
magnetic flux corresponding to the permanent magnetThe magnetic induction intensity can be expressed by a formula of magnetic induction intensity. Assuming a permanent magnet M 1 And a permanent magnet M 2 The magnetic induction intensity of the end face of the magnetic pole is B respectively m1 And B m2 And B is m1 ＝B m2 ＝B m . In addition, it is assumed that the areas of the pole end surfaces of the permanent magnet 1 and the permanent magnet 2 are S m1 And S is m2 And S is m1 ＝S m2 ＝S m . It is possible to obtain a solution that,
thereby having the following characteristics
Referring to FIG. 7, FIG. 7 shows a coil and a permanent magnet M 1 And a permanent magnet M 2 A schematic drawing is drawn separately from the closed magnetic line curve of (a). In the figure, magnet M 1 The generated closed magnetic force line passes through the magnetic gap D 1，1 Magnet M 2 The generated closed magnetic force line passes through the magnetic gap D 2,1 The closed magnetic force lines generated by the coil sequentially pass through the magnetic gap D 1 And magnetic gap D 2 。
Referring to FIG. 9, FIG. 9 is a schematic diagram of a mover assembly, magnetic domain D 1,1 ，D 2,1 And a relationship diagram of the stator assembly. In the magnetic domain D 1,1 The middle rotor assembly receives a leftward suction force F from the stator assembly 1 In the magnetic domain D 2,1 The middle rotor assembly receives a rightward suction force F from the stator assembly 2 . With positive rightward direction, the stator assembly has a resultant force of-F 1 +F 2 。
Referring to fig. 10, fig. 10 is a force analysis diagram of the mover assembly isolated from each other, the mover assembly receiving forces from the stator assembly, respectively suction forces F to the left 1 And suction force F to the right 2 The resultant force is-F 1 +F 2 。
F Moving magnet ＝-F 1 +F 2
The formula of the electromagnetic force generated by each magnetic domain is further deduced. The electromagnetic attraction force acting on the magnetized ferromagnetic object is proportional to the total area of the magnetic lines passing through the magnetic poles and the square of the magnetic induction. If the magnetic induction B is uniformly distributed along the pole surface and the air gap length is calculated to be small, the formula for calculating the electromagnetic attraction force is calculated by the formula of maxwell Wei Gong, which is expressed as:
f electromagnetic attraction force
B magnetic flux density (Magnetic flux density) or magnetic induction intensity
S: magnetic force line passing through magnetic pole area
μ 0 : permeability of air
C: the pole end face combination type and shape correlation coefficient have different values for different scenes. If the force generated between the permanent magnet and the permanent magnet is C m2m Usually, the value is 1, and an accurate value is obtained through actual measurement in the actual design process; c if the force between the permanent magnet and the magnetic iron (yoke) is applied m2y Usually, the value is 1/2, and an accurate value is obtained through actual measurement in the actual design process; if the force between the magnet (yoke) and the magnet (yoke) is the force, C y2y Usually, the value is 1/4, and the accurate value is obtained through actual measurement in the actual design process.
The above formula is used to calculate the above magnetic domain D 1 And magnetic domain D 2 The electromagnetic attraction force of (a) is as follows:
wherein the method comprises the steps of，S D1 ，S D2 Respectively magnetic domain D 1,1 ，D 2,1 Corresponding area of annular end face, and S D1 ＝S D1 ＝S D . Thus, there are:
the method comprises the following steps:
because of
F Moving magnet ＝-F 1 +F 2
Then there is
F Dynamic magnet, linear ＝F Dynamic magnet, linear +F Dynamic magnet, nonlinear
Will F 1,linear ，F 2,linear ，F 1,nonlinear ，F 1,nonlinear Substituted into F Dynamic magnet, linear And F Dynamic magnet, nonlinear The calculation is as follows:
because of
Thus, there are:
likewise calculate F Dynamic magnet, nonlinear ，
So that the resultant force of the moving magnet as the moving member is:
from the above derivation, the following features can be seen:
1) In the resultant linear term F Dynamic magnet, linear In component F 1,linear And F 2,linear The respective linear terms are superimposed separately so that the resultant linear term F Dynamic magnet, linear And the coil current is larger.
2) In the resultant nonlinear term F Dynamic magnet, nonlinear In component F 1,nonlinear And F 2,nonlinear The respective nonlinear terms cancel each other out so that the resultant nonlinear term F Dynamic magnet, nonlinear Zero.
The above structure is called a coil magnetic parallel nonlinear term cancellation moving magnetic vibrator. This structure can be applied not only to a vibrator but also to a stopper, and a moving magnet vibrator or stopper using the above structure is also called a coil magnetic parallel nonlinear term canceling moving magnet vibrator or stopper.
Example 3
Referring to fig. 11-15, a coil magnetic parallel nonlinear item counteracted moving magnetic vibrator comprises a moving magnetic vibrator body 11, wherein the moving magnetic vibrator body 11 comprises an outer cylinder 1, a vibration transmitting sheet 9, a stator component and a rotor component, the stator component comprises a coil combination structure, the rotor component comprises a magnet combination structure, the coil combination structure comprises a coil 5 and a first magnetizer 7, the magnet combination structure comprises a permanent magnet 3 and a second magnetizer 4, the stator component is fixed in the outer cylinder 1, the vibration transmitting sheet 9 is fixed on the outer cylinder 1, the rotor component and the vibration transmitting sheet 9 are fixedly connected through at least one position, wherein the rotor component moves, the stator component is fixed, and the rotor component is called a moving part;
the vibration transmitting sheet 9 can be rectangular, round, runway-shaped or three-dimensional according to different application scenes, and can be matched for use according to different application scenes; the vibration-transmitting plate 8 is usually fixed on the top surface, the bottom surface, or in the middle of the outer cylinder 1.
The stator component is fixed in the outer cylinder 1 and can be arranged on the inner side wall, the top surface or the bottom surface of the outer cylinder 1;
the mover assembly is fixedly connected with the vibration transmission sheet 9 through at least one site, wherein the site comprises point contact and surface contact, and the site can be one site, two sites or a plurality of sites.
The rotor component and the stator component are in concave-convex staggered occlusion arrangement, and the main magnetic force line closed curve of the coil 3 and the main magnetic force line closed curve of the permanent magnet 3 respectively and alternately pass through the rotor component and the stator component:
the permanent magnet 3 is outside, the coil 5 is inside, N Magnetic field =2, the polarities of the two opposite end faces adjacent to the permanent magnet are the same.
A magnetizer is used at a position, close to the shell, of the coil 3, so that the magnetic resistance of a magnetic circuit of the electromagnet formed by the coil 3 is as small as possible; the permanent magnets 6 in the magnet assembly are isolated by a magnetizer; yoke iron is used around the coil 3 and the permanent magnet 6, or magnetic conductive outer cylinder is used for the coil assembly and the housing close to the coil 3.
The outer cylinder 1 can be a magnetic conductive outer cylinder or a non-magnetic conductive outer cylinder, and the magnetic conductive outer cylinder is preferable for reducing magnetic resistance; the cross section of the outer cylinder can be round, square, or irregular, and can be continuous or discontinuous, such as columnar connection or grid-like discontinuity.
The coil combination structure also comprises a first magnetic conduction ring 8 and a yoke 6, the magnet combination structure also comprises a second magnetic conduction ring 2, the polarity of two opposite end faces adjacent to the permanent magnet 3 is the same, the number of the coils 5 is two, the current direction in the adjacent coils 5 is opposite, the polarity of the electromagnetic fields of the adjacent two end faces is the same, the vibration transmission sheet 9 is provided with one, the vibration transmission sheet 9 is fixed on the top surface of the outer cylinder 1, one end of the first magnetic conduction ring 7 is fixed on the bottom surface of the outer cylinder 1, the two coils 5 are circumferentially fixed on the first magnetic conduction ring 7, the yoke 6 is fixedly arranged in front of the two coils, the first magnetic conduction ring 8 is fixed on one end of the first magnetic conduction ring 7, the vibration transmission support 10 is L-shaped, the horizontal part of the vibration transmission support 10 is parallel to the vibration direction, three permanent magnets 3 are sequentially fixed on the horizontal part of the vibration transmission support 10, second magnetic conductors 4 are fixedly arranged between adjacent permanent magnets 10, second magnetic conductive rings 2 are arranged outside the permanent magnets 4, the second magnetic conductive rings 2 and the second magnetic conductors 4 are fixed on the horizontal part of the vibration transmission support 10, the rotor assembly and the stator assembly are in concave-convex staggered occlusion arrangement, the main magnetic force line closing curve of a coil 5 and the main magnetic force line closing curve of the permanent magnets 4 alternately pass through the rotor assembly and the stator assembly respectively, and 4 magnetic fields D which are symmetrically designed in pairs are arranged inside the moving magnetic vibrator body 1,1 、D 2,1 、D 1,2 And D 2,2 The main magnetic force line closed curve of the coil 5 and the main magnetic force line closed curve of the permanent magnet 3 respectively pass through the magnetic domain D 1,1 、D 2,1 、D 1,2 And D 2,2 In the magnetic domain D 1,1 In which the magnetic force lines of the coil 5 are in the same direction as those of the permanent magnet 3, and in the magnetic field D 2,1 Wherein the magnetic force lines of the coil 5 are opposite to the magnetic force lines of the permanent magnet 3。
The derivation process of the coil magnetic parallel nonlinear term cancellation of the moving magnetic vibrator in this embodiment is the same as that in embodiment 1, and will not be described again.
Claims (9)
1. The coil magnetic parallel nonlinear term counteracted moving magnetic vibrator is characterized in that: the magnetic resonance type vibration transducer comprises a moving magnetic resonance type vibration transducer body, wherein the moving magnetic resonance type vibration transducer body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly, the stator assembly comprises a coil combination structure, the rotor assembly comprises a magnet combination structure, the coil combination structure comprises a coil and a first magnetizer, the magnet combination structure comprises a permanent magnet and a second magnetizer, the stator assembly is fixed in the outer cylinder, the vibration transmission sheet is fixed on the outer cylinder, the rotor assembly is fixedly connected with the vibration transmission sheet through at least one position, and the permanent magnet is outside and the coil is inside when seen from the center; the number of the permanent magnets is N Magnetic field The number of coils is N Ring(s) ，N Magnetic field >N Ring(s) Or N Magnetic field ＜N Ring(s) ；N Magnetic field 1,2,3, …,100; n (N) Ring(s) 1,2,3, …,100; the inside of the moving magnetic vibrator body is provided with 2N magnetic domains D which are designed in pairwise symmetry 1,i And D 2,i N is 1,2,3, …,100, i=1, 2,3, …; the main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,i And D 2,i And in magnetic domain D 1,i In the magnetic field D, the magnetic force line direction of the coil is the same as that of the permanent magnet 2,i Wherein the magnetic force line direction of the coil is opposite to the magnetic force line direction of the permanent magnet; or in the magnetic domain D 1,i Wherein the magnetic force lines of the coil are opposite to the magnetic force lines of the permanent magnet, and are in the magnetic field D 2,i The magnetic force line direction of the coil is the same as the magnetic force line direction of the permanent magnet.
2. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 1, wherein: the rotor component and the stator component are in concave-convex staggered occlusion arrangement, and the main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet alternately pass through the rotor component and the stator component respectively.
3. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 2, wherein: n (N) Magnetic field ＝(N Ring(s) +1) n; n is a natural number, n=1, 2,3 …; when N is Magnetic field >1, the polarities of the two opposite end surfaces adjacent to the permanent magnet are the same; when N is Ring(s) >1, the directions of currents in adjacent coils are opposite, and the polarities of electromagnetic fields of two adjacent end faces of the adjacent coils are the same.
4. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 2, wherein: n (N) Magnetic field ＝(N Ring(s) -1) n; n is a natural number, n=1, 2,3 …;
when N is Magnetic field >1, the polarities of the two opposite end surfaces adjacent to the permanent magnet are the same; when N is Ring(s) >1, the directions of currents in adjacent coils are opposite, and the polarities of electromagnetic fields of two adjacent end faces of the adjacent coils are the same.
5. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 2, wherein: the magnetic conductor is used at the position of the shell, which is close to the coil, so that the magnetic resistance of the magnetic circuit of the electromagnet formed by the coil is as small as possible; the permanent magnets in the magnet assembly are isolated by a magnetizer; a yoke is used around the coil and the permanent magnet, or a magnetic conductive outer cylinder is used for a coil assembly and a shell close to the coil.
6. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 5, wherein: the coil combination structure further comprises a first magnetic conduction ring, the magnet combination structure further comprises a second magnetic conduction ring, the number of the permanent magnets is two, the number of the coils is one, the polarities of two opposite end surfaces adjacent to the permanent magnets are the same, and vibration is transmittedThe vibration transmission device comprises an outer cylinder, a first magnetic conduction ring, a second magnetic conduction ring, a permanent magnet, a rotor component and a stator component, wherein the vibration transmission plate is fixed on the top surface of the outer cylinder, one end of the first magnetic conduction ring is fixed on the bottom surface of the outer cylinder, a coil is fixed on the first magnetic conduction ring in a surrounding mode, one end of the first magnetic conduction ring is fixed on the first magnetic conduction ring, a vibration transmission support is L-shaped, the horizontal part of the vibration transmission support is parallel to the vibration direction, the second magnetic conduction ring is fixed on the horizontal part of the vibration transmission support, the permanent magnet is fixedly arranged on two sides of the second magnetic conduction ring, the two permanent magnets are fixed on the horizontal part of the vibration transmission support, the rotor component and the stator component are in concave-convex staggered occlusion arrangement, a main magnetic line closing curve of the coil and a main magnetic line closing curve of the permanent magnet alternately pass through the rotor component and the stator component respectively, and 2 magnetic fields D which are designed in a two-by two symmetrical mode are arranged inside the movable magnetic vibrator body 1,1 And D 2,1 The main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,1 And D 2,1 In the magnetic domain D 1,1 Wherein the magnetic force lines of the coil are opposite to the magnetic force lines of the permanent magnet, and are in the magnetic field D 2,1 The magnetic force line direction of the coil is the same as the magnetic force line direction of the permanent magnet.
7. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 3, wherein: the coil combination structure further comprises a first magnetic conduction ring and a second magnetic conduction ring, the coils are arranged in the outside, the permanent magnets are arranged outside, the number of the permanent magnets is two, the current directions in the adjacent coils are opposite, the adjacent two coils are identical in polarity of electromagnetic fields of two adjacent end faces, the vibration transmission sheet is provided with one vibration transmission sheet, the vibration transmission sheet is fixed on the top surface of the outer cylinder, one end of the first magnetic conduction body is fixed on the bottom surface of the outer cylinder, the two coils are circumferentially fixed on the first magnetic conduction body, the second magnetic conduction ring is fixed on one end of the first magnetic conduction body, and the first magnetic conduction ring is circumferentially fixed in the middle of the first magnetic conduction body and is positioned at the two coilsThe vibration transmission support is L-shaped, the horizontal part of the vibration transmission support is parallel to the vibration direction, the permanent magnet is fixed in the middle of the horizontal part of the vibration transmission support, the second magnetizer is positioned at the two sides of the permanent magnet and fixed on the horizontal part of the vibration transmission support, the rotor component and the stator component are in concave-convex staggered occlusion arrangement, the main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet alternately pass through the rotor component and the stator component respectively, and 4 magnetic fields D which are designed in two-by-two symmetry are arranged in the movable magnetic vibrator body 1,1 、D 2,1、 D 1,2 、D 2,2 Wherein D is 1,1 And D 2,1 Symmetry, D 1,2 And D 2,2 Symmetrically, the main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,1 、D 2,1、 D 1,2 、D 2,2 In the magnetic domain D 1,1 The magnetic force line direction of the coil is opposite to the magnetic force line direction of the permanent magnet.
8. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 3, wherein: the coil combination structure further comprises a first magnetic conduction ring and a yoke, the magnet combination structure further comprises a second magnetic conduction ring, the number of the permanent magnets is three, the polarities of two opposite end faces adjacent to the permanent magnets are the same, the number of the coils is two, the directions of currents in the adjacent coils are opposite, the polarities of electromagnetic fields of the adjacent two end faces are the same, one vibration transmission sheet is arranged, the vibration transmission sheet is fixed on the top surface of the outer cylinder, one end of the first magnetic conduction body is fixed on the bottom surface of the outer cylinder, the two coils are circumferentially fixed on the first magnetic conduction body, the yoke is fixedly arranged before the two coils, the first magnetic conduction ring is fixed on one end of the first magnetic conduction body, the vibration transmission support is L-shaped, the horizontal part of the vibration transmission support is parallel to the vibration direction, the three permanent magnets are sequentially fixed on the horizontal part of the vibration transmission support, the second magnetic conduction body is fixedly arranged between the adjacent permanent magnets, and the outer permanent magnets are circumferentially fixed on the first magnetic conduction supportThe side is provided with a second magnetic conduction ring, the second magnetic conduction ring and the second magnetizer are fixed on the horizontal part of the vibration transmission bracket, the rotor component and the stator component are in concave-convex staggered occlusion arrangement, the main magnetic line of force closed curve of the coil and the main magnetic line of force closed curve of the permanent magnet respectively and alternately pass through the rotor component and the stator component, and 4 magnetic fields D which are designed in two-by-two symmetry are arranged inside the moving magnetic vibrator body 1,1 、D 2,1 、D 1,2 And D 2,2 The main magnetic force line closed curve of the coil and the main magnetic force line closed curve of the permanent magnet respectively pass through the magnetic domain D 1,1 、D 2,1 、D 1,2 And D 2,2 In the magnetic domain D 1,1 Wherein the magnetic force line direction of the coil is the same as the magnetic force line direction of the permanent magnet, and in the magnetic domain D 2,1 The magnetic force line direction of the coil is opposite to the magnetic force line direction of the permanent magnet.
9. The coil-magnetic parallel nonlinear term-offset moving-magnetic vibrator according to claim 1, wherein: the vibration transmission sheet is round, runway-shaped, rectangular or three-dimensional.
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| CN117443701A (en) * | 2023-02-21 | 2024-01-26 | 东莞市惟动智能科技有限公司 | Dynamic magnetic vibrator with coil magnetic parallel push-pull nonlinear term cancellation and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117443701A (en) * | 2023-02-21 | 2024-01-26 | 东莞市惟动智能科技有限公司 | Dynamic magnetic vibrator with coil magnetic parallel push-pull nonlinear term cancellation and application thereof |
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