CN102231316B - Two-section-type double-iron-core differential transformer - Google Patents
Two-section-type double-iron-core differential transformer Download PDFInfo
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- CN102231316B CN102231316B CN2011100727968A CN201110072796A CN102231316B CN 102231316 B CN102231316 B CN 102231316B CN 2011100727968 A CN2011100727968 A CN 2011100727968A CN 201110072796 A CN201110072796 A CN 201110072796A CN 102231316 B CN102231316 B CN 102231316B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000004804 winding Methods 0.000 claims abstract description 31
- 238000012360 testing method Methods 0.000 abstract description 13
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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Abstract
The invention discloses a two-section-type double-iron-core differential transformer used for solving the technical problem that in the existing differential transformer, the linearity is difficult to regulate due to a single iron core. The technical scheme is as follows: a movable iron core (7) is arranged on the basis of the existing differential transformer, wherein the external diameter of the movable iron core (7) is equal to that of an iron core (5), and the structure of the movable iron core (7) is the same as that of the iron core (5); the iron core (5) is screwed at the root fixing position of a threaded rod of a guide rod (6), and the movable iron core (7) is screwed on the threaded rod of the guide rod (6) and can move left and right; and untouchable and freely-moveable gaps are reserved between the external diameters of the iron core (5) and the movable iron core (7) and inner bores of a skeleton of a primary skeleton winding 3. Through changing the distance of the iron cores, the linearity of the differential transformer can be conveniently regulated. The test result shows that when the distance of a pair of iron cores with the length of 9mm is regulated to 1.5mm (delta), the linearity tends to the optimum, and the linear range is enlarged from +/-3mm when delta is 0mm to +/-5mm.
Description
Technical field
The present invention relates to a kind of differential transformer, the two differential transformers unshakable in one's determination of particularly a kind of two-period form.
Background technology
Known differential variable pressure transducer, no matter coil be arranged as two-period form or syllogic, its structure is all by a primary coil; Two secondary coils that the number of turn is identical, magnetic conductive shell, movably unshakable in one's determination the composition; The same common transformer of operation principle, both differences only are that the iron core of common transformer is fixed; And the iron core of differential transformer moves, and the iron core that moves can make output voltage with change in displacement, can realize the electrical measurement of non electrical quantity.
Differential transformer transducer is the Sensitive Apparatus that displacement is changed into electric weight, extensive use in the physical quantity test relevant with displacement.As measuring of displacement, linearity is basic demand, and the linearity of differential transformer can be represented by the characteristic curve of displacement and output voltage.Theoretic characteristic curve is to mediate with iron core, and output voltage is zero balance point as coordinate zero point, with two straight lines that slope equates of symmetry at zero point; It is a supposition sensor construction symmetry fully; The eddy current loss of ignoring permeability magnetic material, magnetic hysteresis loss, influences such as winding wire distributed capacitance obtain; And actual transducer can not meet above-mentioned condition fully, thereby the characteristic curve of measuring is two curves that slope does not wait.This nonlinearity erron just occurred, compares with the theoretical characteristics curve, and its available range of linearity narrows down, and invalid stroke strengthens.
Document " " sensor technology handbook National Defense Industry Press, 1986 " a kind of differential transformer is disclosed, comprise left end cap 1, overcoat 2, elementary skeleton winding 3, secondary skeleton winding 4, iron core 5, guide rod 6, right end cap 8 and screw 9; Elementary skeleton winding 3 and two secondary skeleton windings 4 are positioned at overcoat 2; Magnetic conduction boss on left end cap 1 and the right end cap 8 stretches into the centre bore of elementary skeleton winding 3, and two terminations are fixed on the secondary skeleton winding 4 with screw 9 respectively, and 5 centers unshakable in one's determination are screwed holes; The left part of guide rod 6 is smooth shafts; Right part 2/3 is and the screw rod of 5 threaded engagement unshakable in one's determination that unshakable in one's determination 5 are spun on the screw rod of guide rod 6, can move left and right.Insert respectively in the hole of left end cap 1 and right end cap 8 at guide rod 6 two ends, and guide rod 6 is matched in clearance with left end cap 1 with right end cap 8.
It improves linear experience and method:
1, confirms rational core length,, progressively shorten, find linear best length through test the slightly long iron core of design;
2, confirm rational coil turn,,, gradually reduce to the reasonable number of turn through test the slightly many coils of the design number of turn;
3, improve magnetic conductor and the machining accuracy of skeleton and the uniformity and the symmetry of coil winding.
Above measure is necessary; But it also is impossible that each item requires all to reach optimum state, and therefore, all requisite existence of each transducer is different from the composition error of other transducer; It impairs the magnetic field homogeneity and the symmetry of designing institute expectation, and linearity is degenerated.Obviously, existing method can overcome individual error to a certain extent, but can not overcome after each item error synthesis the influence to linearity.
Summary of the invention
In order to overcome existing differential transformer because single iron core makes the deficiency that linearity is difficult to adjust; The present invention provides a kind of two-period form two differential transformers unshakable in one's determination; With core design is two-period form, through adjustment between the iron core apart from δ, can adjust the linearity of differential transformer easily.
The technical solution adopted for the present invention to solve the technical problems is: the two differential transformers unshakable in one's determination of a kind of two-period form; Comprise left end cap 1, overcoat 2, elementary skeleton winding 3, secondary skeleton winding 4, iron core 5, guide rod 6, right end cap 8 and screw 9; Elementary skeleton winding 3 and two secondary skeleton windings 4 are positioned at overcoat 2; Magnetic conduction boss on left end cap 1 and the right end cap 8 stretches into the centre bore of elementary skeleton winding 3, and two terminations are fixed on the secondary skeleton winding 4 with screw 9 respectively, and 5 centers unshakable in one's determination are screwed holes; The left part of guide rod 6 is smooth shafts; Right part 2/3 is and the screw rod of 5 threaded engagement unshakable in one's determination, and insert respectively in the hole of left end cap 1 and right end cap 8 at guide rod 6 two ends, and guide rod 6 is matched in clearance with left end cap 1 with right end cap 8.Be characterized in also comprising that moving iron core 7, said moving unshakable in one's determination 7 and 5 outside dimensions unshakable in one's determination etc. are big, structure is identical; Said unshakable in one's determination 5 are spun on the root fixed position of guide rod 6 screw rods, and moving unshakable in one's determination 7 are spun on the screw rod of guide rod 6, can move left and right; Unshakable in one's determination 5 and the skeleton endoporus of moving unshakable in one's determination 7 external diameter and elementary skeleton winding 3 between leave and do not contact the gap that can move freely.
The invention has the beneficial effects as follows: owing to be two-period form with core design, through between the adjustment iron core apart from δ, reached the effect of convenience adjustment Linear Range of Differential Transformer.Test result shows: a pair of length is the iron core of 9mm, and linearity is tending towards best when spacing transfers to δ=1.5mm, its range of linearity during by δ=0mm ± 3mm is extended to ± 5mm.
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Description of drawings
Fig. 1 is the two differential transformer structure charts unshakable in one's determination of two-period form of the present invention.
Fig. 2 is an enlarged drawing unshakable in one's determination among Fig. 1.
Fig. 3 is a background technology differential transformer structure chart.
Among the figure, the 1-left end cap, the 2-overcoat, the elementary skeleton winding of 3-, 4-level skeleton winding, 5-is unshakable in one's determination, the 6-guide rod, 7-is moving unshakable in one's determination, 8-right end cap, 9-screw, the height of a-magnetic conduction boss, b-core length, δ-spacing unshakable in one's determination, L
0-left end cap 1 and right end cap 8 magnetic conduction raised head face spacings.
Embodiment
With reference to accompanying drawing 1～2, the two differential transformers unshakable in one's determination of two-period form of the present invention comprise guide rod 6 and with its composition one and with its iron core that moves 5 and moving unshakable in one's determination 7; At guide rod 6, iron core 5 also comprises 3, twice level backbone windings of elementary skeleton winding group 4 with moving unshakable in one's determination 7 periphery; Overcoat 2, left end cap 1 and right end cap 8, lock-screw 9; The left part of guide rod 6 is smooth shafts, and right part is a screw rod; Iron core 5 is measure-alike with moving iron core 7, has endoporus to process screw thread; Unshakable in one's determination 5 is uncomfortable iron cores, is spun on the root of guide rod 6 screw rods, and moving unshakable in one's determination 7 is iron cores of adjustable positions, leaves between the skeleton endoporus of the external diameter of two iron cores and elementary skeleton winding 3 and does not contact the gap that can move freely.
Described left end cap 1 is measure-alike with right end cap 8, and the center is porose, and the side in the hole respectively has external diameter identical, highly is the magnetic conduction boss of a, inserts the skeleton endoporus two ends of elementary skeleton winding 3 respectively; The smooth shaft of guide rod 6 left parts inserts in the centre bore of left end cap 1, and by the centre bore supporting, both are matched in clearance; The major diameter of thread of guide rod 6 right parts can get in the centre bore of right end cap 8 when guide rod 6 thread heads move to the limit on the right-right-hand limit position less than the center bore of right end cap 8.
Described unshakable in one's determination 5 with the material of moving unshakable in one's determination 7, shell 2, left end cap 1 and right end cap 8 all be Armco iron, the energising back is constituted the closed magnetic circuit of air-gap by these materials; Guide rod 6 is non-magnet_conductible material copper or 1cr18Ni9Ti, can prevent leakage field.
The coil of elementary skeleton winding 3 is connect the oscillation power multivibrator; Supply power with the 9V D.C. regulated power supply; The coil of twice level backbone winding groups 4 connects differential rectifier; Its direct current output meets range ± 20V, and resolving power is 3 half word voltage tables of 0.01V, can carry out the test of displacement unshakable in one's determination and output voltage relation.
Test setting: transducer displacement measurement platform, wherein micrometer head is equipped with the reading drum, and scale value is 0.005mm; Vernier caliper, precision are 0.02mm.
The unshakable in one's determination taking-up and charging method: the differential transformer that adopts structure shown in the accompanying drawing; Keeping under the former assembling status condition, only 3 lock-screws 9 with left end cap 1 unload, and can take off left end cap 1 and reach the iron core 5 and moving iron core 7 of forming one with guide rod 6 with guide rod 6; Use kind of calliper when changing two spacings unshakable in one's determination; After writing down size, again left end cap 1 is replied former assembling state together with guide rod 6 and unshakable in one's determination 5 and moving unshakable in one's determination 7, and fixing with lock-screw 9.
Method of testing: from sensor output voltage is that zero balance point moves to positive and negative two orientation, and every separated 1mm surveys a bit, and both sides respectively survey 5 points.
Testing procedure: begin earlier test from spacing δ unshakable in one's determination=0, progressively enlarge spacing then, its characteristic of measuring data is highly sensitive near zero point before this; Away from reducing gradually zero point; But reverse situation appears when data, and promptly low near the sensitivity at zero point, during away from zero point highly sensitive; Then use reciprocal approximatioss instead and seek optimal spacing, the characteristic that optimal spacing is measured data is the sensitivity basically identical of every millimeter displacement of each measuring point.
The test result of the length b=9mm of a pair of identical iron core is seen table 1.
The test data of table 1 core length b=9mm
Find out from table 1:
1) when two spacing δ unshakable in one's determination=0, be equivalent to the whole singlecore of a 2b=2 * 9=18mm, higher near the sensitivity at zero point, can reach 1.45v/mm, away from reducing gradually zero point, its available range of linearity is no more than ± 3mm.
2) when two unshakable in one's determination spacing δ=1mm, whole sensitivity descends to some extent, but still is highly sensitive near zero point, away from zero point low, be camber, this shows the increase spacing of still needing, and lowers high part.
3) when two unshakable in one's determination spacing δ=2mm, whole sensitivity continues to descend, but that sensitivity became near zero point is low, away from zero point high, be middle concave, this shows transfers excessively, still needs and dwindles spacing.
4) when two unshakable in one's determination spacing δ=1.5mm, the sensitivity basically identical of each measuring point, this shows that two spacings unshakable in one's determination are tending towards best, and its sensitivity is about 1.08v/mm, and the range of linearity extends to ± 5mm, and its linearity is superior to ± 0.3%FS.
5) being proved by the spacing δ=0mm of two iron cores and the test result of δ=1.5mm, is feasible with two methods that change the pitch extension ranges of linearity unshakable in one's determination, compares with singlecore; Though sensitivity descends to some extent; But mechanical trip can make full use of, and for example, two effective travels unshakable in one's determination of b=9mm are 10mm; (2 * 9+1.5)=10.5mm, both only differ 0.5mm to its mechanical trip L0-(2b+1.5)=30-.
With the length b of a pair of identical iron core change 8,7,6 into, 5mm, utilize above-mentioned identical method of testing, also can obtain the result of the identical expansion range of linearity, just sensitivity more descends.The test result of b=8mm and b=6mm is listed in table 2 at present.
The test result of table 2 core length b=8mm and b=6mm
Can know by table 2, under the condition that mechanical trip allows,, should select the iron core of a pair of longer size for use, as far as possible like b=9mm or b=8mm in order to obtain higher sensitivity.
It is above-mentioned to combine institute; Overcome of the influence of transducer composition error with changing spacing unshakable in one's determination to linearity; The effect of its expansion range of linearity is tangible; It is linear that it can make each transducer can both use balance magnetic circuit error to change the method expansion of output characteristic, only on circuit, worked hard thereby remedied in the past, and on magnetic circuit helpless reality.
Claims (4)
1. two differential transformers unshakable in one's determination of a two-period form; Comprise left end cap (1), overcoat (2), elementary skeleton winding (3), secondary skeleton winding (4), (5), guide rod (6) unshakable in one's determination, right end cap (8) and screw (9); Elementary skeleton winding (3) and two secondary skeleton windings (4) are positioned at overcoat (2), and the magnetic conduction boss on left end cap (1) and the right end cap (8) stretches into the centre bore of elementary skeleton winding (3), and two terminations use screw (9) to be fixed on the secondary skeleton winding (4) respectively; (5) center unshakable in one's determination is a screwed hole; The left part of guide rod (6) is a smooth shaft, is and the screw rod of (5) threaded engagement unshakable in one's determination that insert respectively in the hole of left end cap (1) and right end cap (8) at guide rod (6) two ends from 2/3 of guide rod (6) termination, right side guide rod (6) entire length; Guide rod (6) is a matched in clearance with left end cap (1) and right end cap (8); It is characterized in that: also comprise moving (7) unshakable in one's determination, said moving iron core (7) and (5) outside dimension unshakable in one's determination etc. are big, and structure is identical; Said iron core (5) is spun on the root fixed position of guide rod (6) screw rod, and moving unshakable in one's determination (7) are spun on the screw rod of guide rod (6), can move left and right; Leave the gap between the external diameter of (5) unshakable in one's determination and moving (7) unshakable in one's determination and the skeleton endoporus of elementary skeleton winding (3), iron core (5) and moving (7) unshakable in one's determination are moved freely in skeleton.
2. the two differential transformers unshakable in one's determination of two-period form according to claim 1 is characterized in that: between said iron core (5) and the moving iron core (7) apart from δ=1.5mm.
3. the two differential transformers unshakable in one's determination of two-period form according to claim 1 is characterized in that: between said iron core (5) and the moving iron core (7) apart from δ=0mm.
4. the two differential transformers unshakable in one's determination of two-period form according to claim 1 is characterized in that: the length b=5～9mm of said iron core (5) and moving (7) unshakable in one's determination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100727968A CN102231316B (en) | 2011-03-24 | 2011-03-24 | Two-section-type double-iron-core differential transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100727968A CN102231316B (en) | 2011-03-24 | 2011-03-24 | Two-section-type double-iron-core differential transformer |
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| CN102231316A CN102231316A (en) | 2011-11-02 |
| CN102231316B true CN102231316B (en) | 2012-11-21 |
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| CN104465044B (en) * | 2013-09-17 | 2017-12-08 | 精量电子（深圳）有限公司 | Linear variable differential sensor and its winding method |
| CN105845403A (en) * | 2016-05-09 | 2016-08-10 | 安徽恒源煤电股份有限公司 | Differential transformer capable of measuring rotation angle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB963965A (en) * | 1963-02-19 | 1964-07-15 | Int Resistance Co | Improvements in or relating to pressure transducers |
| JP2010210309A (en) * | 2009-03-09 | 2010-09-24 | Tamagawa Seiki Co Ltd | Multiple rotation angle detector |
| CN202025611U (en) * | 2011-03-24 | 2011-11-02 | 西北工业大学 | Dual-section type dual-iron-core differential transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210610A (en) * | 1996-01-30 | 1997-08-12 | Noble Sangyo Kk | High-frequency excitation differential transformer for preventing influence of external magnetism and metal, etc. |
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2011
- 2011-03-24 CN CN2011100727968A patent/CN102231316B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB963965A (en) * | 1963-02-19 | 1964-07-15 | Int Resistance Co | Improvements in or relating to pressure transducers |
| JP2010210309A (en) * | 2009-03-09 | 2010-09-24 | Tamagawa Seiki Co Ltd | Multiple rotation angle detector |
| CN202025611U (en) * | 2011-03-24 | 2011-11-02 | 西北工业大学 | Dual-section type dual-iron-core differential transformer |
Non-Patent Citations (1)
| Title |
|---|
| 袁希光.《传感器技术手册》.《传感器技术手册》.国防工业出版社,1989,370-382. * |
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