CN114923406A - High-precision full-range angle sensor based on magnetostrictive principle - Google Patents
High-precision full-range angle sensor based on magnetostrictive principle Download PDFInfo
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- CN114923406A CN114923406A CN202210795855.2A CN202210795855A CN114923406A CN 114923406 A CN114923406 A CN 114923406A CN 202210795855 A CN202210795855 A CN 202210795855A CN 114923406 A CN114923406 A CN 114923406A
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- 238000005259 measurement Methods 0.000 claims abstract description 22
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- 238000004804 winding Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses a high-precision full-range angle sensor based on a magnetostrictive principle, which is used for accurately measuring a rotating angle based on the magnetostrictive principle, wherein a signal plate generates current pulse during measurement, the current generates a magnetic field to move along a waveguide wire, the waveguide wire generates a magnetostrictive effect and generates a strain pulse to be transmitted back to a measuring element along the waveguide wire when interacting with the magnetic field generated by a movable magnetic core, and the position of the movable magnetic core can be determined by measuring the time of the current pulse and the time of the strain pulse, and the angle can be converted into an angle. The high-precision rotation angle sensor has a measuring range of 360 degrees, and has the advantages of simple structure, high measuring precision, absolute value output, non-contact measurement, excellent weather resistance and the like.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a high-precision full-range angle sensor based on a magnetostrictive principle.
Background
The angle sensor is a sensing element which can convert the input quantity of linear displacement or angular displacement of machinery into resistance or voltage output in a certain functional relation with the input quantity, and is widely applied to measuring physical quantities such as pressure, acceleration, liquid level and the like besides the measurement of the linear displacement and the angular displacement.
With the development of production and scientific technology, the angle measurement of products and parts is more and more widely applied, and the requirement on precision is higher and higher. The existing general angle measuring device adopts a Hall chip principle, has lower precision, has higher precision of a part of measuring devices applying high-density optical cables and laser interference, but has complex structure, severe requirement on environment and higher cost, and is not easy to popularize and apply in a large range. The invention provides an angle sensor based on the magnetostrictive principle, which has the advantages of simple structure, high measurement precision, absolute value output, non-contact measurement, excellent weather resistance and the like.
Disclosure of Invention
Therefore, the invention provides a high-precision full-range angle sensor based on a magnetostrictive principle, which aims to solve the problems of low precision, complex structure, high cost and the like of the conventional angle measuring device.
In order to achieve the above purpose, the invention provides the following technical scheme: a high-precision full-range angle sensor based on a magnetostrictive principle comprises a shell, a rotating shaft, a movable magnetic core and a magnetostrictive measurement assembly, wherein one end of the rotating shaft is connected with an external part to be measured, the other end of the rotating shaft is provided with the movable magnetic core and extends into the shell, the magnetostrictive measurement assembly is arranged in the shell and comprises a waveguide wire and a signal plate, the waveguide wire is of a spiral structure, the movable magnetic core is driven by the rotating shaft to move on the inner side of the waveguide wire, two ends of the waveguide wire are connected with the signal plate, the signal plate generates current pulses during measurement, a magnetic field generated by the current moves along the waveguide wire, when the signal plate interacts with the magnetic field generated by the movable magnetic core, the waveguide wire generates a magnetostrictive effect and generates strain pulses, and the position of the movable magnetic core is determined by measuring the time of the current pulses and the strain pulses, and to scale the angle information accordingly.
Furthermore, the sensor also comprises a cable, wherein the cable is connected with the signal plate and extends out of an outlet on the shell for outputting signals.
Furthermore, the magnetostrictive measurement assembly further comprises a sensitive support, the sensitive support is arranged on one side of the rotating shaft, a waveguide wire packaging end fixing hole and a waveguide wire welding end inserting hole are formed in the sensitive support, the two ends of the waveguide wire are respectively a welding end and a packaging end, the welding end of the waveguide wire penetrates through the waveguide wire welding end inserting hole, is fixed through the waveguide wire fixing support and is welded with the signal plate, and the packaging end of the waveguide wire is inserted into the waveguide wire packaging end fixing hole after being packaged and is welded with the signal plate through a lead.
Furthermore, the magnetostrictive measurement assembly also comprises a coil, wherein a coil winding support is arranged on the sensitive support, and the coil is wound on the coil winding support in the sensitive support and is welded on the signal plate.
Furthermore, the magnetostrictive measurement assembly further comprises a sensitive magnetic core, a sensitive magnetic core fixing groove is formed in the sensitive support, the sensitive magnetic core is fixed on the sensitive support through the sensitive magnetic core fixing groove, and meanwhile the sensitive magnetic core and the coil are arranged at intervals.
Furthermore, the magnetostrictive measurement assembly further comprises a central lead, wherein a central lead penetrating hole is formed in the sensitive support, the central lead penetrates into the central lead, one end of the central lead is welded with the waveguide wire, and the other end of the central lead extends into the middle of the coil and is arranged in parallel to the axial direction of the coil.
Furthermore, the sensitive support is provided with a signal plate fixing hole, the signal plate is provided with a mounting hole, and the signal plate is fixed on the sensitive support through a fastening screw.
Further, the sensor is still including fixing copper sheathing and the jump ring on the shell, the pivot stretches into in the middle of the waveguide silk to fixed through the jump ring, carry out rotary motion in the copper sheathing, be equipped with removal magnetic core draw-in groove in the pivot, be provided with the dust cover on the shell and be used for sealing the pivot.
Furthermore, the sensor further comprises a shielding cover, the waveguide wire is installed in the waveguide wire installation groove of the shielding cover, the shielding cover further comprises a sensitive support groove used for fixing a sensitive support, and the shielding cover is used for wrapping the whole circuit system and protecting the inside.
Furthermore, be equipped with the end cover on the shell in order to encapsulate inside, install embedded cast ear on the shell with the increase of intensity.
The invention has the following advantages:
the invention provides a high-precision full-range angle sensor based on a magnetostrictive principle, which is based on the magnetostrictive principle and is used for accurately measuring a rotating angle, a signal plate generates current pulse during measurement, the current generates a magnetic field to move along a waveguide wire, the waveguide wire generates a magnetostrictive effect and generates a strain pulse to return to a measuring element along the waveguide wire when interacting with the magnetic field generated by a movable magnetic core, and the position of the movable magnetic core can be determined by measuring the time of the current pulse and the time of the strain pulse, and an angle is converted according to the position. This high accuracy rotation angle sensor has 360 degrees measuring range, compares with domestic current angle sensor, has following obvious advantage:
incremental and absolute measurement can be realized; measuring in a full measuring range of 360 degrees, and selecting a working stroke; providing a plurality of output modes of analog quantity, pulse width modulation and serial protocol; the main advantages of the magnetostrictive principle are utilized to overcome the technical defects in the existing contact and non-contact angle sensors, and the sensor has the advantages of high precision, low power consumption, stable and diversified output signals and low cost; the sensor is greatly improved in the aspects of use environment, service life and the like; the inner part is filled with glue and sealed, so that water vapor is effectively prevented from entering the inner part of the shell, and the anti-vibration shell has an anti-vibration function; when the installation, need not to consider installation angle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic structural diagram of a high-precision full-range angle sensor based on a magnetostrictive principle according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of another angle of a high-precision full-range angle sensor based on the magnetostrictive principle according to embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional structural view of a high-precision full-range angle sensor based on the magnetostrictive principle according to embodiment 1 of the present invention;
fig. 4 is another schematic cross-sectional structural diagram of a high-precision full-range angle sensor based on the magnetostrictive principle according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of an internal structure of a high-precision full-range angle sensor based on a magnetostrictive principle according to embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a waveguide wire in a high-precision full-range angle sensor based on the magnetostrictive principle according to embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a sensitive support in a high-precision full-range angle sensor based on a magnetostrictive principle according to embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of a shield case in a high-precision full-range angle sensor based on a magnetostrictive principle according to embodiment 1 of the present invention.
In the figure: the sensor comprises an end cover 1, a shell 2, an embedded casting lug 3, a cable 4, a signal plate 5, a rotating shaft 6, a waveguide wire 7, a fastening screw 8, a sensitive support 9, a sensitive magnetic core 10, a coil 11, a central lead 12, a shielding cover 13, a dustproof cover 14, a clamp spring 15, a copper sleeve 16, a movable magnetic core 17, a waveguide wire fixing support 18, a welding end 7-1, a packaging end 7-2, a sensing end 7-3, a signal plate fixing hole 9-1, a sensitive magnetic core fixing groove 9-2, a waveguide wire packaging end fixing hole 9-3, a waveguide wire welding end inserting hole 9-4, a coil winding support 9-5, a central lead welding hole 9-6, a central lead inserting hole 9-7, a waveguide wire installing groove 13-1 and a sensitive support groove 13-2.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, this embodiment provides a high-precision full-range angle sensor based on the magnetostrictive principle, and the sensor includes an end cap 1, a housing 2, an embedded casting lug 3, a cable 4, a signal board 5, a rotating shaft 6, a waveguide wire 7, a fastening screw 8, a sensitive bracket 9, a sensitive magnetic core 10, a coil 11, a central lead 12, a shield cover 13, a dust cap 14, a clamp spring 15, a copper bush 16, a movable magnetic core 17, and a waveguide wire fixing bracket 18.
As shown in FIG. 6, the waveguide wire 7 further includes a soldering terminal 7-1, a packaging terminal 7-2, and an induction terminal 7-3.
As shown in fig. 7, the sensitive bracket 9 further includes a signal board fixing hole 9-1, a sensitive magnetic core fixing groove 9-2, a waveguide wire encapsulation fixing hole 9-3, a waveguide wire welding end insertion hole 9-4, a coil winding bracket 9-5, a central lead welding hole 9-6, and a central lead penetrating hole 9-7.
As shown in fig. 8, the shielding case 13 further includes a waveguide wire mounting groove 13-1 and a sensitive support groove 13-2.
The end cover 1 is matched with the shell to package the whole sensor, and the joint of the end cover and the shell is filled with waterproof sealant.
The shell 2 is provided with a groove which is matched with the end cover 1 to seal the circuit part; the shell 2 is provided with a wire outlet which is connected with the cable 4; the shell 2 is provided with a rotating shaft hole, and the rotating operation of the rotating shaft 6 is ensured through the pre-embedded copper sleeve 16; the shell 2 is provided with a mounting hole, and the strength is increased by embedding the embedded casting lugs 3.
The embedded casting lugs 3 are embedded into the mounting hole positions of the shell 2 through an injection molding process.
The circuit board 5 is provided with a mounting hole and is fixed on a sensitive bracket 9 through a fastening screw 8; the circuit board is provided with a welding hole which is welded with the waveguide wire 7. The signal plate 5 is welded with a cable to output a signal.
The rotating shaft 6 is arranged in the middle of the waveguide wire 7, is fixed through a clamp spring 15 and rotates in a copper sleeve 16; the rotating shaft 6 is provided with a movable magnetic core 17 clamping groove.
The waveguide wire 7 is integrally in a spiral structure to prevent mutual interference from head to tail; the welding end 7-1 of the waveguide wire 7 penetrates through a waveguide wire welding end insertion hole 9-4 on the sensitive support 9, is fixed through a waveguide wire fixing support 18 and is welded with the signal plate 5; the packaging end 7-2 of the waveguide wire 7 is packaged and then inserted into the packaging end fixing hole 9-3 of the waveguide wire on the sensitive bracket 9; the packaging end 7-2 of the waveguide wire 7 is welded with the signal plate 5 through a lead wire. The induction end 7-3 of the waveguide wire 7 is placed in the waveguide wire mounting groove 13-1 in the shielding case 13.
The fastening screw 8 fixes the signal plate 5 on the signal plate fixing hole 9-1 on the sensitive bracket 9.
The sensitive bracket 9 also comprises a sensitive magnetic core fixing groove 9-2 for fixing a sensitive magnetic core 10; the sensitive bracket 9 also comprises a central lead penetrating hole 9-7, a central lead 12 penetrates into the hole, and one end of the central lead is welded with the waveguide wire 7; the sensitive bracket 9 also comprises a coil winding bracket 9-5 for winding a coil 11; the sensitive support comprises a pivot lead welding hole 9-6 for welding the waveguide wire 7 with the pivot lead 12.
The sensitive magnetic core 10 is fixed on the sensitive bracket 9 through the sensitive magnetic core fixing groove 9-2, and meanwhile, the sensitive magnetic core 10 and the coil 11 are ensured to be arranged in parallel at intervals.
The coil 11 is wound on the coil winding support 9-5 in the sensitive support 9 and welded on the signal plate.
One end of the central lead wire 12 is welded on the waveguide wire 7, and the other end of the central lead wire extends into the middle of the coil 11 and is arranged in parallel with the axial direction of the coil 11.
The shielding case 13 further comprises a waveguide wire mounting groove 13-1 for fixing the waveguide wire 7; the shielding cover 13 further comprises a sensitive bracket groove 13-2 for fixing the sensitive bracket 9; the shield 13 covers the entire circuit system and protects the inside.
A dust cap 14 is mounted on the housing 2 to seal the shaft 6.
The circlip 15 axially fixes the shaft 6.
The copper bush 16 is embedded in the shell 2 to assist the operation of the rotating shaft.
The movable magnetic core 17 is inserted into the slot of the rotating shaft 6 and rotates along with the rotating shaft to provide a movable magnetic field for the sensor, and the position of the magnetic core after rotation is the rotating angle.
The high accuracy full-scale range angle sensor based on magnetostrictive principle that this embodiment provided, based on magnetostrictive principle, carry out the precision measurement to the rotation angle, the signal board produces the current pulse during the measurement, this current produces the magnetic field and follows the waveguide silk motion, when the magnetic field interaction with removing the magnetic core production, the waveguide silk produces the magnetostrictive effect, and produce the pulse of meeting an emergency and pass back measuring element along the waveguide silk, can confirm the position of removing the magnetic core through the time of measuring current pulse and pulse of meeting an emergency, and become an angle with this conversion. The high-precision rotation angle sensor has a measurement range of 360 degrees.
Compared with the domestic existing angle sensor, the angle sensor has the following obvious advantages:
(1) incremental and absolute measurement can be realized;
(2) measuring in a full-range of 360 degrees, and selecting a working stroke; providing a plurality of output modes of analog quantity, pulse width modulation and serial protocol;
(3) the main advantages of the magnetostrictive principle are utilized to overcome the technical defects in the existing contact and non-contact angle sensors, and the sensor has the advantages of high precision, low power consumption, stable and diversified output signals and low cost;
(4) the sensor is greatly improved in the aspects of use environment, service life and the like;
(5) the inner part is filled with glue and sealed, so that water vapor is effectively prevented from entering the shell, and the anti-vibration function is realized;
(6) when the installation, need not to consider installation angle.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (10)
1. A high-precision full-range angle sensor based on a magnetostrictive principle is characterized by comprising a shell, a rotating shaft, a movable magnetic core and a magnetostrictive measuring assembly, wherein one end of the rotating shaft is connected with an external part to be measured, the other end of the rotating shaft is provided with the movable magnetic core and extends into the shell, the magnetostrictive measuring assembly is arranged in the shell and comprises a waveguide wire and a signal plate, the waveguide wire is of a spiral structure, the movable magnetic core is driven by the rotating shaft to move on the inner side of the waveguide wire, the two ends of the waveguide wire are connected with the signal plate, the signal plate generates current pulses during measurement, a magnetic field generated by the current moves along the waveguide wire, when the magnetic field generated by the movable magnetic core interacts with the magnetic field, the waveguide wire generates a magnetostrictive effect and generates strain pulses, and the position of the movable magnetic core is determined by measuring the time of the current pulses and the strain pulses, and to scale the angle information accordingly.
2. A full-range angle sensor of high accuracy based on magnetostrictive principle according to claim 1, characterized in that the sensor further comprises a cable, the cable is connected with the signal plate and extends out through an outlet on the housing for outputting signal.
3. The high-precision full-range angle sensor based on the magnetostrictive principle according to claim 1, wherein the magnetostrictive measurement assembly further comprises a sensitive support, the sensitive support is arranged on one side of the rotating shaft, a waveguide wire packaging end fixing hole and a waveguide wire welding end inserting hole are formed in the sensitive support, two ends of the waveguide wire are respectively a welding end and a packaging end, the welding end of the waveguide wire penetrates through the waveguide wire welding end inserting hole, is fixed through the waveguide wire fixing support and is welded with the signal board, and the packaging end of the waveguide wire is inserted into the waveguide wire packaging end fixing hole after being packaged and is welded with the signal board through a lead.
4. A high accuracy full range angle sensor based on magnetostrictive principle according to claim 3, characterized in that the magnetostrictive measuring assembly further comprises a coil, and the sensing bracket is provided with a coil winding bracket, and the coil is wound on the coil winding bracket in the sensing bracket and welded on the signal plate.
5. The high-precision full-range angle sensor based on the magnetostrictive principle as claimed in claim 4, wherein the magnetostrictive measuring assembly further comprises a sensitive magnetic core, the sensitive support is provided with sensitive magnetic core fixing grooves, and the sensitive magnetic core is fixed on the sensitive support through the sensitive magnetic core fixing grooves while being ensured to be spaced from the coil rows.
6. The high-precision full-range angle sensor based on the magnetostrictive principle according to claim 4, wherein the magnetostrictive measurement assembly further comprises a pivot lead, the sensitive support is provided with a pivot lead penetrating hole, the pivot lead penetrates into the pivot lead, one end of the pivot lead is welded with the waveguide wire, and the other end of the pivot lead extends into the middle of the coil and is axially parallel to the coil.
7. The high-precision full-range angle sensor based on the magnetostrictive principle as claimed in claim 3, wherein the sensitive bracket is provided with a signal plate fixing hole, and the signal plate is provided with a mounting hole and is fixed on the sensitive bracket through a fastening screw.
8. The high-precision full-range angle sensor based on the magnetostrictive principle according to claim 1, further comprising a copper sleeve and a clamp spring which are fixed on the shell, wherein the rotating shaft extends into the middle of the waveguide wire and is fixed through the clamp spring to rotate in the copper sleeve, a movable magnetic core clamping groove is formed in the rotating shaft, and a dustproof cover is arranged on the shell and used for sealing the rotating shaft.
9. A high-accuracy full-range angle sensor based on the magnetostrictive principle as claimed in claim 3, wherein the sensor further comprises a shielding cover, the waveguide wire is mounted in the waveguide wire mounting groove of the shielding cover, the shielding cover further comprises a sensitive bracket groove for fixing a sensitive bracket, and the shielding cover is used for wrapping the whole circuit system and protecting the inside.
10. A high accuracy full range angle sensor based on magnetostrictive principle according to claim 1, characterized in that the housing is provided with end caps to encapsulate the inside, and the housing is provided with embedded castors to increase the strength.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210795855.2A CN114923406B (en) | 2022-07-07 | 2022-07-07 | High-precision full-range angle sensor based on magnetostriction principle |
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| CN202210795855.2A CN114923406B (en) | 2022-07-07 | 2022-07-07 | High-precision full-range angle sensor based on magnetostriction principle |
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| CN114923406B CN114923406B (en) | 2024-02-02 |
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| CN203550902U (en) * | 2013-11-22 | 2014-04-16 | 北京特倍福电子科技有限公司 | Modular-designed magnetostrictive displacement sensor |
| CN104677255A (en) * | 2013-11-29 | 2015-06-03 | 上海雷尼威尔技术有限公司 | Displacement sensor used for field reading |
| US20160025547A1 (en) * | 2014-07-23 | 2016-01-28 | Orion Instruments, LLC | Magnetostrictive transmitter piezoelectric pickup sensor |
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| CN206056496U (en) * | 2016-09-26 | 2017-03-29 | 宜春学院 | A kind of Hall angular transducer |
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|---|---|---|---|---|
| KR20100119345A (en) * | 2009-04-30 | 2010-11-09 | 인제대학교 산학협력단 | Noncontact absolute displacement sensor using magnetostriction phenomena |
| CN103234443A (en) * | 2013-04-24 | 2013-08-07 | 四川大学 | Wide-range magnetostrictive displacement sensor measuring device and method |
| CN203550902U (en) * | 2013-11-22 | 2014-04-16 | 北京特倍福电子科技有限公司 | Modular-designed magnetostrictive displacement sensor |
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| CN114923406B (en) | 2024-02-02 |
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