CN103941034A - Magnetofluid composite angular velocity sensor - Google Patents
Magnetofluid composite angular velocity sensor Download PDFInfo
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- CN103941034A CN103941034A CN201410134139.5A CN201410134139A CN103941034A CN 103941034 A CN103941034 A CN 103941034A CN 201410134139 A CN201410134139 A CN 201410134139A CN 103941034 A CN103941034 A CN 103941034A
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Abstract
The invention discloses a magnetofluid composite angular velocity sensor. A metal shell body is a cylindrical container made of soft magnetic materials and used for containing a mechanical structure and a circuit and shielding outside electromagnetic interference, and a threaded hole is formed in the bottom of the metal shell body and used for fixing the whole angular velocity sensor to a measured object. MFC are three-phase solutions composed of non-conductive base solutions, magnetic particles and non-magnetic solid particles. Permanent magnets are cylindrical and are used for providing a gradient magnetic field, and the MFC are made to generate the magnetofluid gravity suspension effect. An electromagnetic coil is wound on a 24-groove stator, the 24-groove stator and the electromagnetic coil are used for generating a rotary magnetic field, and the non-magnetic solid particles in the MFC can spin in a reversed mode. Soft magnets are used for shielding magnetic field interference generated at the cross position of the magnetic coil. A three-phase alternating current generating circuit is used for generating three-phase alternating voltages, and the three-phase alternating voltages are loaded to the electromagnetic coil through an isolation circuit to generate the rotary magnetic field. The magnetofluid composite angular velocity sensor has the advantages of being low in cost, high in linearity and high in sensitivity.
Description
Technical field
The present invention relates to angular-rate sensor field, relate in particular to a kind of magnetic liquid in magnetic fluid compound and angular-rate sensor of non magnetic composition spinning effect of utilizing.
Background technology
Magnetic liquid (Magnetic Fluid is called for short MF) is made up of the magnetic particle, stabilizing agent and the base fluid that are suspended in base fluid, with a kind of new function material of mobility and electro permanent magnetic dual nature.If the non magnetic solid particle (about 100-5000nm) that adds third phase to be made by different materials in magnetic fluid; and this non magnetic solid particle also has electric conductivity (metal or coated metal); magnetic fluid compound (Magnetic Fluid Composites is called for short MFC) will show the attribute of unique optics, electromagnetics and mechanical rheology aspect so.At home, the sensor taking magnetic liquid as core has just just entered the research starting stage at home, less to the research of magnetic liquid inertial sensor.
Because quality, the density of non-magnetic particle in MFC are general different from magnetic fluid, MFC generally need work under Microgravity condition.Otherwise the non magnetic solid constituent in MFC (three-phase fluid) will be deposited to the bottom of container or move on to the upper strata (unless non magnetic composition is identical with quality, the density of magnetic fluid) of liquid in containers under gradient gravity.To under earth environment, use this MFC, need to be at the additional gradient magnetic of vertical direction, magnetic fluid solution has levitation effect (producing a power upwards that is greater than conventional buoyancy) under this gradient magnetic, and non-magnetic material is wherein suspended in solution.Like this, non-magnetic material equivalence is under microgravity environment.In Microgravity, the non magnetic composition of MFC is stable without magnetic gradient, whole MFC system macroscopic view homogeneous.Like this, small additional physical field just can affect MFC liquid internal structure and attribute, makes it to occur correlation effect, shows specific optics, electromagnetics and mechanical rheological characteristics etc.
Summary of the invention
The invention provides a kind of magnetic fluid compound angular-rate sensor, the present invention utilizes magnetic liquid and the non magnetic composition spinning effect in magnetic fluid compound to propose a kind of novel angular-rate sensor, described below:
A kind of magnetic fluid compound angular-rate sensor, described magnetic fluid compound angular-rate sensor comprises: metal shell, MFC, permanent magnet, 24 groove stators, solenoid, soft magnetic bodies, and external three-phase alternating current circuit for generating,
Described metal shell is the cylindrical container that soft magnetic material forms, and for holding physical construction and circuit, and shields outside electromagnetic interference, and described metal shell bottom is provided with threaded hole, for whole angular-rate sensor is fixed on to testee;
The three-phase solution that described MFC is made up of non-conductive base fluid, magnetic particle and non magnetic solid particle;
Described permanent magnet is cylindric permanent magnet, for gradient magnetic is provided, makes described MFC produce magnetic fluid levitation effect;
Described solenoid is wrapped on described 24 groove stators, and described 24 groove stators and described solenoid, for generation of rotating magnetic field, make the non magnetic solid particle reversed spin in described MFC;
The magnetic interference that described soft magnetic bodies produces for shielding described solenoid infall;
Described three-phase alternating current circuit for generating, for generation of three-phase alternating voltage, is loaded on described solenoid and is produced rotating magnetic field by buffer circuit.
The beneficial effect of technical scheme provided by the invention is: utilize the electromagnetic attributes of magnetic fluid compound uniqueness and the New Magnetic Field Controlled fluid inertia gravity sensor of mechanical rheological characteristics to have low cost, high linearity, highly sensitive feature, change in occasion in quasistatic and low frequency inertia gravitation especially, there is high linearity and sensitivity response.
1, novel structure of the present invention, does not have solid moving-member, does not have mechanical wear, therefore has high reliability, high strength, long-life feature;
2, the present invention has low cost, high linearity, highly sensitive feature, changes in occasion especially in quasistatic and low frequency inertia gravitation, has high linearity and sensitivity response.
Brief description of the drawings
Fig. 1 is vertical view of the present invention.
Wherein: 1,2,3 and 4-screw; 5-end cap.
Fig. 2 is cut-open view A-A corresponding in Fig. 1.
Wherein: 3,4-screw; 5-end cap; 6-metal shell; 7-screw thread; 8-screw; 10-circuit platform; 11-upward wiring plate; The upper soft magnetic bodies of 12-; The upper soft magnetic bodies support of 13-; The upper permanent magnet of 14-; The upper permanent magnet support of 15-; 16-MFC; 17-24 groove stators; Permanent magnet under 18-; Soft magnetic bodies support under 19-; Soft magnetic bodies under 20-; 21-downward cabling plate; 9,22-backstay.
Fig. 3 is the schematic diagram of upper and lower wiring board of the present invention, upper and lower soft magnetic bodies support and upper and lower permanent magnet support.
Fig. 4 is the schematic diagram of 24 groove stators.
Fig. 5 is assembling decomposing schematic representation of the present invention (screw and backstay do not draw, and wherein the label of screw (23,24,25 and 26) has been marked on corresponding threaded hole).
Fig. 6 is that generation phase difference output is the electrical schematic diagram (needing to add buffer circuit between this circuit and solenoid, not shown in FIG.) of the three-phase alternating voltage of 120 °.
Fig. 7 is that three-phase 24 groove windings are wound around planimetric map.U
1and U
2the all 0 ° sinusoidal voltage of access by buffer circuit but current direction is contrary, V
1and V
2the all 120 ° sinusoidal voltages of access by buffer circuit but current direction is contrary, U
1and U
2the all 240 ° sinusoidal voltages of access by buffer circuit but current direction is contrary.Direction of current as shown in the figure.
Fig. 8 is the graph of a relation between extraneous input angular velocity f and quality factor q.Extraneous input angular velocity is taking Hz as unit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
A kind of magnetic fluid compound angular-rate sensor, comprise: metal shell 6, MFC16, permanent magnet (upper permanent magnet 14 and lower permanent magnet 18), 24 groove stators 17, solenoid (not shown), soft magnetic bodies (upper soft magnetic bodies 12 and lower soft magnetic bodies 20), and external three-phase alternating current circuit for generating.
Metal shell 6, for the cylindrical container that soft magnetic material forms, for holding physical construction and the circuit of angular-rate sensor, and shields outside electromagnetic interference, and metal shell 6 bottoms are provided with threaded hole, for whole angular-rate sensor is fixed on to testee.
The three-phase solution that MFC16 is made up of non-conductive base fluid, magnetic particle and non magnetic solid particle.
Permanent magnet is cylindric permanent magnet, for gradient magnetic is provided, makes MFC16 produce magnetic fluid levitation effect, thereby non magnetic solid particle is suspended in solution equably.
Solenoid is wrapped on 24 groove stators 17, and 24 groove stators 17 and solenoid, for generation of rotating magnetic field, make the non magnetic solid particle reversed spin in MFC16.
The magnetic interference that soft magnetic bodies produces for shielding solenoid infall.
Three-phase alternating current circuit for generating is for generation of three-phase alternating voltage, is loaded into and on solenoid, produced rotating magnetic field by buffer circuit.This circuit is that those skilled in the art are in common knowledge, and the embodiment of the present invention does not repeat this.
This angular-rate sensor is the reversed spin motion of doing under the effect of rotating magnetic field by the non-magnetic material in MFC16 around z axle, and the direction of its angular momentum is also along z axle.In the time that whole angular-rate sensor has the additional angular momentum along x axle or y axle (z axle is orthogonal for x, y), the quality factor of circuit change, and within the scope of certain gyro frequency, the inverse of quality factor is linear with the additional angular velocity rotatablely moving.
Below in conjunction with the structure of detailed this angular-rate sensor of description of accompanying drawing, described below:
Fig. 1 is vertical view of the present invention.This Figure illustrates screw 1,2,3 and 4 and be along the circumferential direction uniformly distributed on end cap 5, effect is to be connected with metal shell 6.
Fig. 2 is cut-open view A-A corresponding in Fig. 1.The backstay that downward cabling plate 21 is inserted to backstay 9 and 22(fore-and-aft direction is not shown).Lower soft magnetic bodies 20 is combined to rear insertion backstay 9 and 22 with lower soft magnetic bodies support 19.24 groove stators 17 and lower permanent magnet 18 are combined to rear insertion backstay 9 and 22.And the assembly combining with backstay is put into metal shell 6.Pour into MFC16 in 24 locating slots 17 after, be coated in 24 locating slot 17 upper surfaces with glue, upper permanent magnet frame 15 and upper permanent magnet 14 are combined after rear insertion backstay 9 and 22 simultaneously, make permanent magnet frame 15 lower surfaces and 24 locating slot 17 upper surface gummeds.Upper soft magnetic bodies frame 13 and upper soft magnetic bodies 12 are combined to insertion backstay 9 and 22.Upward wiring plate 11 is inserted to backstay 9 and 22.After circuit platform 10 and circuit board etc. are combined, with unshowned screw in screw 8(and Fig. 2) be fixed on upward wiring plate 11.End cap 5 is connected by screw 1,2,3 and 4 with metal shell 6.Screw thread 7 is for whole angular-rate sensor is fixed on testee.
Fig. 3 is the schematic diagram of upper and lower wiring board of the present invention, upper and lower soft magnetic bodies support and upper and lower permanent magnet support.Groove shape in figure is used for the coil cabling that produces rotating magnetic field.Circular hole is used for inserting backstay 9 and 22.
Fig. 4 is the schematic diagram of 24 groove stators.As shown in Figure 4, groove shape is used for the coil cabling that produces rotating magnetic field, and middle circle column space is for holding MFC.Circular hole is used for inserting backstay 9 and 22.
Fig. 5 is assembling decomposing schematic representation of the present invention (screw and backstay do not draw, and wherein the label of screw has been marked on corresponding threaded hole).Install and form according to order as shown in the figure.
Fig. 6 is that generation phase difference output is the electrical schematic diagram of the three-phase alternating voltage of 120 °, is input as 50Hz sinusoidal voltage.When specific implementation, can also adopt other three-phase alternating voltage to produce circuit, the embodiment of the present invention is not restricted this.
Fig. 7 is that three-phase 24 groove windings are wound around planimetric map.U
1and U
2the all 0 ° sinusoidal voltage of access by buffer circuit but current direction is contrary, V
1and V
2the all 120 ° sinusoidal voltages of access by buffer circuit but current direction is contrary, U
1and U
2the all 240 ° sinusoidal voltages of access by buffer circuit but current direction is contrary.Direction of current as shown in the figure.
Fig. 8 is the graph of a relation between extraneous input angular velocity f and quality factor q.Extraneous input angular velocity is taking Hz as unit.
The principle of work of a kind of magnetic fluid compound angular-rate sensor of the present invention is as follows:
After being wound around in 24 locating slots 17 according to the solenoid shown in Fig. 7, when giving solenoid input phase poor while being the three-phase alternating current of 120 °, can produce the rotating magnetic field of rotating around z axle, thereby the magnetisable material in MFC solution is followed rotating magnetic field and is rotated, acting force between magnetisable material and non-magnetic material in MFC solution makes non-magnetic material produce reversed spin motion, the direction of its moment of inertia is along z axle, and z direction of principal axis as shown in Figure 2.When whole sensor has, along x axle or y axle, (z axle is orthogonal for x, y, x and y direction of principal axis are as shown in Figure 1) additional angular momentum time, the quality factor of circuit change, and within the scope of certain gyro frequency, the inverse of quality factor is linear with the additional angular velocity rotatablely moving, as shown in Figure 8.
The measuring method of brief description quality factor of circuit.The energy-storage travelling wave tube of whole circuit is equivalent to inductance L, and dissipative cell is equivalent to resistance R, records the electric current I of the voltage U at circuit two ends and the whole circuit of flowing through, and obtains U=I(LS+R), angle relationship is ∠ U=∠ I+ ∠ arctan(L ω/R).Like this, according to the value of the angle relationship of U, I and ω, just can calculate to obtain the ratio of L and R, also just obtain the quality factor of circuit.
The embodiment of the present invention to the model of each device except do specified otherwise, the model of other devices does not limit, and all can as long as can complete the device of above-mentioned functions.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a magnetic fluid compound angular-rate sensor, is characterized in that, described magnetic fluid compound angular-rate sensor comprises: metal shell, MFC, permanent magnet, 24 groove stators, solenoid, soft magnetic bodies, and external three-phase alternating current circuit for generating,
Described metal shell is the cylindrical container that soft magnetic material forms, and for holding physical construction and circuit, and shields outside electromagnetic interference, and described metal shell bottom is provided with threaded hole, for whole angular-rate sensor is fixed on to testee;
The three-phase solution that described MFC is made up of non-conductive base fluid, magnetic particle and non magnetic solid particle;
Described permanent magnet is cylindric permanent magnet, for gradient magnetic is provided, makes described MFC produce magnetic fluid levitation effect;
Described solenoid is wrapped on described 24 groove stators, and described 24 groove stators and described solenoid, for generation of rotating magnetic field, make the non magnetic solid particle reversed spin in described MFC;
The magnetic interference that described soft magnetic bodies produces for shielding described solenoid infall;
Described three-phase alternating current circuit for generating, for generation of three-phase alternating voltage, is loaded on described solenoid and is produced rotating magnetic field by buffer circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134139.5A CN103941034A (en) | 2014-04-03 | 2014-04-03 | Magnetofluid composite angular velocity sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134139.5A CN103941034A (en) | 2014-04-03 | 2014-04-03 | Magnetofluid composite angular velocity sensor |
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| CN103941034A true CN103941034A (en) | 2014-07-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107092756A (en) * | 2017-04-26 | 2017-08-25 | 上海航天控制技术研究所 | A kind of angular-rate sensor modeling method based on MHD effect |
| CN110208567A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | Contactless magnetic fluid rotation-speed measuring device, design method and rotating speed measurement method |
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| CN103453896A (en) * | 2013-09-13 | 2013-12-18 | 天津大学 | Magnetic-fluid gyroscope |
| CN103591945A (en) * | 2013-11-19 | 2014-02-19 | 天津大学 | Magnetic fluid top suitable for measuring 0-1 KHz of input signals |
| CN203909058U (en) * | 2014-04-03 | 2014-10-29 | 天津大学 | Magnetofluid compound angular velocity sensor |
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2014
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Patent Citations (3)
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| CN103453896A (en) * | 2013-09-13 | 2013-12-18 | 天津大学 | Magnetic-fluid gyroscope |
| CN103591945A (en) * | 2013-11-19 | 2014-02-19 | 天津大学 | Magnetic fluid top suitable for measuring 0-1 KHz of input signals |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107092756A (en) * | 2017-04-26 | 2017-08-25 | 上海航天控制技术研究所 | A kind of angular-rate sensor modeling method based on MHD effect |
| CN107092756B (en) * | 2017-04-26 | 2020-10-02 | 上海航天控制技术研究所 | Angular velocity sensor modeling method based on magnetohydrodynamics effect |
| CN110208567A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | Contactless magnetic fluid rotation-speed measuring device, design method and rotating speed measurement method |
| CN110208567B (en) * | 2019-05-28 | 2023-10-20 | 南方科技大学 | Non-contact magnetic fluid rotating speed measuring device, design method and rotating speed measuring method |
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Application publication date: 20140723 |