CN101192464A - Method for cancelling hysteresis of magnetoelastic torque sensor - Google Patents
Method for cancelling hysteresis of magnetoelastic torque sensor Download PDFInfo
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- CN101192464A CN101192464A CNA2006101636912A CN200610163691A CN101192464A CN 101192464 A CN101192464 A CN 101192464A CN A2006101636912 A CNA2006101636912 A CN A2006101636912A CN 200610163691 A CN200610163691 A CN 200610163691A CN 101192464 A CN101192464 A CN 101192464A
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Abstract
The invention relates to a method and device for reducing the magnetic hysteresis in the torque converter element, wherein a coil is included which is excited by an alternating current to produce a magnetic field that makes the torque converter element being saturated. The magnetic saturation of the torque converter element is provided by an alternate frequency which exceeds the coercive force of the material, and the alternating current gradually reduces to greatly reduce the undesired magnetic field. The amplitude and the frequency used for exciting the coil component only wipe out the undesired magnetic-field components.
Description
Technical field
Present invention relates in general to a kind of method of eliminating the magnetic hysteresis in the magnetoelastic torque sensor.More particularly, the present invention is a kind of method of eliminating the remanent magnetism of required magnetic flux path outside.
Background technology
Magnetoelastic torque sensor has utilized the band of one or more magnetoelastic material, and these bands are supported in the substrate.These magneto-elasticity bands have the circumferential remanent magnetism that magnetocrystalline anisotropy limited that is subjected to this material.The moment of torsion that is applied to this substrate has brought out the spirality shear stress that acts on this magnetoelastic material, and this spirality shear stress causes the path, magnetic field to be moved into spiral orientation from circumferential orientation.Use magnetic field measuring device to measure the axial component in this magnetic field, and utilize this axial component to determine moment of torsion.
Disadvantageously, be discontinuous in case be applied to this suprabasil moment of torsion, the remanent magnetism part in this magnetic field will remain.Axial remnant field in this magneto-elasticity band can cause the null offset of this torque sensor.The drift of null value is commonly referred to magnetic hysteresis.A kind of known method that is used to eliminate the magnetic in the magnetization main body comprises this structure is placed in the alternating magnetic field, and the peak amplitude of this alternating magnetic field surpasses the coercive force of this material.Yet such method needs independent device, and these self-contained units are disabled during operation, and this method removed all magnetic-field components, or even those are in the component on the required Circumferential field direction.
Therefore, wish that a kind of method and apparatus of development comes the selective removal remanent magnetism that axially lags behind, and keeps needed circumferential remanent magnetism constant simultaneously.
Summary of the invention
Eliminate magnetic hysteresis according to an exemplary method of the present invention by applying, thereby removal is along the remanent magnetism of the axis of the axle of this torque transducer from the alternating magnetic field of a coil.
Comprise around torque transducer according to method of the present invention and to support a coil vertically.Encourage this coil with an alternating current, the amplitude of this alternating current is enough to form such alternating magnetic field, that is, the amplitude of this alternating magnetic field is greater than the coercitive major part of the material that constitutes this torque transducer.The magnetic pumping of this torque transducer is used to eliminate remnant field on the axial direction.By specifically and meticulously this coil being aimed at the magneto-elasticity band of this torque transducer, the remnant field on the axial direction can be removed, and can not disturb the interior Circumferential field of band that is located at this transducer.
Therefore, comprise a coil block according to torque sensor of the present invention, encourage this coil block with alternating current, to form a magnetic field, this magnetic field has reduced or has eliminated unwanted remnant field, and can not disturb needed magnetic-field component in this torque transducer.
Explanation by hereinafter and accompanying drawing can be understood these and further feature of the present invention best.
Description of drawings
Fig. 1 is the partial cross-sectional view according to a kind of example torque transducer of the present invention;
Fig. 2 is the viewgraph of cross-section of another example torque transducer of the present invention;
Fig. 3 is the viewgraph of cross-section according to the another example torque transducer of the present invention;
Fig. 4 is the block diagram of expression the inventive method step.
Embodiment
Referring to Fig. 1, it has schematically shown the part of moment of torsion transducer sensor assembly 10.This torque sensor 10 comprises torque transducer element 15, and this torque transducer element 15 comprises substrate or the axle 12 that is supporting magneto-elasticity ring 16.This magneto-elasticity ring 16 is applied on this axle 12, makes the moment of torsion that is applied to axle 12 as shown in the reference numeral 26 like that be passed on this magneto-elasticity ring 16.
The Circumferential field that schematically shows at label 18 places is arranged in this magnetoelastic material ring 16.The circumferential direction in this magnetic field 18 is that the neutral state of this torque transducer element 15 does not have torque condition in other words.During applying moment of torsion 26, the part in this magnetic field 18 has had axial component, and moves apart this circumferential direction.The axial component in this magnetic field 18 is represented with arrow 20.Measure the axial component 20 in this magnetic field 18 with magnetometer 22.This magnetometer 22 is provided with respect to this element of transducer 15, so that detect the axial component 20 in this magnetic field 18.Yet when having removed when being applied to this moment of torsion of 12, a part of axial component 20 in this magnetic field 18 has remained.The residue axial component 20 in this magnetic field 18 has twisted the dead-center position of this torque transducer element 15, thereby causes undesirable magnetic hysteresis.
Therefore, comprise magnetometer coil 22 according to this torque transducer assembly 10 of the present invention, this magnetometer coil 22 has a plurality of magnet-wires 24 with these torque transducer element 15 coaxial windings.This coil 22 is connected to power supply 28, and this power supply 28 provides alternating current 25.These alternating current 25 these coils 22 of excitation are so that produce the magnetic field with alternation peak value.The size of this alternating current 25 and frequency are chosen to remove the magnetic-field component 20 of this hysteresis, keep this circumferential component 18 constant simultaneously.
The amplitude of this alternating magnetic field 25 and frequency are determined based on these torque transducer element 15 employed concrete materials.In an exemplary torque transducer element 15 that is made of 9310 steel alloys, the frequency of employed alternating magnetic field is 60Hz, and peak value is 50 oersteds.A kind of so big alternating current carries out magnetic pumping to this element of transducer 15, to remove the axial component 20 in magnetic field 18.Removed should hysteresis magnetic field 18 axial component 20, then greatly reduce null offset.
In case discharged moment of torsion, and removed the hysteresis axial component 20 in this magnetic field, this torque sensor is then with the magnetic hysteresis that reduces greatly or do not having to carry out work under the situation of magnetic hysteresis, thereby the accuracy that improves is provided.
Can recognize that the excitation of carrying out with 25 pairs of coils of big alternating current 22 might be disturbed with the detection to magnetic field 18 of detector for magnetic field or magnetometer.Yet, comprise alternately the changing of current amplitude and frequency according to method of the present invention, so that this magnetic field detection function to be provided, and also to provide and should eliminate function in hysteresis magnetic field.
Referring to Fig. 3, it shows another exemplary torque transducer 60, and this torque transducer 60 comprises coil block 65, and this coil block 65 is only as the demagnetization function, so that optionally remove the axial lagging component in this magnetic field 68.Be embedded in this coil block 65 is known magnetic vector checkout gear 62.These magnetic vector checkout gears will be passed to known control device 64 to the measurement result to magnetic field.These coil block 65 work are with the axial component 66 in selective removal magnetic field.The coil block 65 of this exemplary torque sensor 60 receives alternating current 70, to encourage this coil 65, and form the periodic magnetic excitation, the amplitude of this periodic magnetic excitation and frequency are specified to can remove those by applying the undesirable magnetic field lagging component that moment of torsion 26 is caused.
Referring to Fig. 4, it shows the method step 80 that is used to remove part magnetic field with schematic block diagram.In this method at the beginning, at first apply a torque to substrate axle 12, shown in label 82.Be applied to the distortion that this 12 distortion or moment of torsion not only cause axle 12, also cause the distortion of magneto-elasticity band 16.Detect the distortion of this magneto-elasticity band 16 with detector for magnetic field, shown in label 84.When having discharged this moment of torsion (shown in label 86), the part in the magnetic field that is produced by this moment of torsion is got off residue, and the axial component of this magnetic hysteresis can cause this torque transducer element 15 to read drift in the magnetic field.This drift that is caused by the axial component in hysteresis magnetic field can be eliminated, to improve the accuracy of this torque transducer assembly.Coil around this torque sensor element 15 is encouraged by alternating current, shown in label 88.This alternating current is specified to the amplitude and the frequency that can provide required, has surpassed most of coercive force of material with the peak amplitude that alternating magnetic field had of this amplitude and frequency formation.The amplitude in the magnetic field that is produced by this coil is enough to cause core material saturated of this fluxgate device 62, and the saturated of these devices can be by tightly determining around their coil with conventional manufacture.The asymmetry of the voltage waveform on this fluxgate coil just expression has the magnetic field from this element of transducer to exist.
Therefore, according to method and apparatus of the present invention by removing any axial component that causes the magnetic field of the null offset among the torque measurement result, thereby provide the accuracy that improves for torque sensor.
Although disclose the preferred embodiments of the present invention, it will be understood by those skilled in the art that some improvement can fall into scope of the present invention.Therefore, should determine true scope of the present invention and content with following claim.
Claims (17)
1. method of removing the magnetic hysteresis in the magnetoelastic torque transducer comprises step:
A) the magneto-elasticity part with respect to this torque transducer supports a coil with one heart; With
B) apparatus has the alternating current of required frequency and amplitude to encourage described coil, so that the remnant field that lags behind of cancellation optionally.
2. method according to claim 1 is characterized in that, described step b) comprises: the axial component of only removing this remnant field.
3. method according to claim 1 is characterized in that, described step b) comprises: keep the circumferential component of magnetic polarization of this torque transducer constant.
4. method according to claim 1 is characterized in that, described frequency and amplitude are chosen to comprise such magnetic field peak amplitude, that is, this magnetic field peak amplitude surpasses most of coercive force of the material that constitutes this torque transducer.
5. method according to claim 1 is characterized in that, comprises the magnetometer that supports around this torque transducer, and comprises step: make this magnetometer and this coil alternation, to remove the axial magnetic field of this hysteresis.
6. method according to claim 5, it is characterized in that, described coil comprises this magnetometer, and encourage this coil with two kinds of alternative frequencies and amplitude, a kind of is to be used for detecting a kind of detection of distortion in magnetic field of this torque transducer with alternative frequency and amplitude, and another kind is a kind of removal of being used for the unwanted hysteresis magnetic-field component of selective removal with alternative frequency and amplitude.
7. method according to claim 6 is characterized in that, also comprises step: make a magnetic core periodically saturated, so that produce a distortion signal based on an excitation field and stack by the magnetic field that this torque transducer produced.
8. method according to claim 1 is characterized in that, comprises step: detect the interior magnetic field of this torque transducer with the magnetic field sensor that is arranged in the described coil.
9. torque sensor assembly comprises:
Be used to receive the substrate of torque load;
The magnetoelastic material band, this band is supported in the described substrate, and produces the magnetic field of this torque load of expression in response to acting on suprabasil torque load;
Be used to measure the magnetic field sensor in described magnetic field; With
Around the coil that described magnetoelastic material band is provided with, described coil produces an alternating magnetic field, and this alternating magnetic field is removed at least a portion and remained in the interior magnetic field of this magnetoelastic material band.
10. assembly according to claim 9 is characterized in that, the excitation of described coil is produced a magnetic field, and the axial component that remains in the magnetic field in this band is removed in this magnetic field.
11. assembly according to claim 10 is characterized in that, after the moment of torsion that will be applied to substrate discharges, removes the axial component in this magnetic field.
12. assembly according to claim 10 is characterized in that, described coil is around the coaxial setting of described substrate.
13. assembly according to claim 10 is characterized in that, the axial length of described coil is more than or equal to the axial length of this band.
14. assembly according to claim 10 is characterized in that, comprises the power supply that is used for providing to coil alternating current, this alternating current produces this alternating magnetic field.
15. assembly according to claim 14, it is characterized in that, described power supply provides first alternating current and second alternating current, and this first alternating current produces periodic magnetic saturation in this torque sensor, the unwanted part in this second alternating current selective removal remnant field.
16. assembly according to claim 15 is characterized in that, described first alternating current and second alternating current are optionally applied, to encourage described coil.
17. assembly according to claim 9 is characterized in that, described coil comprises first coil and second coil that is used to detect the magnetic field in this band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101636912A CN101192464B (en) | 2006-11-30 | 2006-11-30 | Method for cancelling hysteresis of magnetoelastic torque sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101636912A CN101192464B (en) | 2006-11-30 | 2006-11-30 | Method for cancelling hysteresis of magnetoelastic torque sensor |
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| Publication Number | Publication Date |
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| CN101192464A true CN101192464A (en) | 2008-06-04 |
| CN101192464B CN101192464B (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006101636912A Expired - Fee Related CN101192464B (en) | 2006-11-30 | 2006-11-30 | Method for cancelling hysteresis of magnetoelastic torque sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675724A (en) * | 2012-09-19 | 2014-03-26 | 华东师范大学 | Device for improving magnetic hysteresis of giant magneto-impedance sensor through electric field and improving method thereof |
| CN105004897A (en) * | 2010-08-24 | 2015-10-28 | 莱姆知识产权股份有限公司 | Toroidal Fluxgate Current Transducer |
| CN105518425A (en) * | 2013-09-06 | 2016-04-20 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Method for operating magnetostrictive sensor |
| CN112543900A (en) * | 2018-08-30 | 2021-03-23 | 阿尔卑斯阿尔派株式会社 | Operation device and control method for operation device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110432A (en) * | 1989-09-25 | 1991-05-10 | Kubota Corp | Manufacture of torque sensor shaft |
| US7225686B2 (en) * | 2004-03-22 | 2007-06-05 | Tdk Corporation | Torque sensing apparatus |
| JP4477431B2 (en) * | 2004-06-29 | 2010-06-09 | ヤマウチ株式会社 | Torque limiter |
-
2006
- 2006-11-30 CN CN2006101636912A patent/CN101192464B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004897A (en) * | 2010-08-24 | 2015-10-28 | 莱姆知识产权股份有限公司 | Toroidal Fluxgate Current Transducer |
| CN105004897B (en) * | 2010-08-24 | 2018-01-02 | 莱姆知识产权股份有限公司 | Toroidal fluxgate current transducer |
| CN103675724A (en) * | 2012-09-19 | 2014-03-26 | 华东师范大学 | Device for improving magnetic hysteresis of giant magneto-impedance sensor through electric field and improving method thereof |
| CN103675724B (en) * | 2012-09-19 | 2016-07-27 | 华东师范大学 | A kind of device utilizing electric field to improve giant magnetic impedance sensor magnetic hysteresis and ameliorative way thereof |
| CN105518425A (en) * | 2013-09-06 | 2016-04-20 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Method for operating magnetostrictive sensor |
| CN105518425B (en) * | 2013-09-06 | 2018-06-29 | 大陆-特韦斯贸易合伙股份公司及两合公司 | For running the method for magneto strictive sensor |
| CN112543900A (en) * | 2018-08-30 | 2021-03-23 | 阿尔卑斯阿尔派株式会社 | Operation device and control method for operation device |
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| CN101192464B (en) | 2012-11-14 |
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Granted publication date: 20121114 Termination date: 20181130 |