CN202025611U - Dual-section type dual-iron-core differential transformer - Google Patents
Dual-section type dual-iron-core differential transformer Download PDFInfo
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- CN202025611U CN202025611U CN201120081193XU CN201120081193U CN202025611U CN 202025611 U CN202025611 U CN 202025611U CN 201120081193X U CN201120081193X U CN 201120081193XU CN 201120081193 U CN201120081193 U CN 201120081193U CN 202025611 U CN202025611 U CN 202025611U
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Abstract
The utility model discloses a dual-section type dual-iron-core differential transformer, which is used for resolving the technical problem that the existing differential transformer has difficulty in linear adjustment due to single iron cores. The technical scheme is characterized in that a movable iron core (7) is arranged based on the existing differential transformer, and the movable iron core (7) has the same diameter and structure with an iron core (5). The iron core (5) is screwed on a fixed position of a root portion of a screw of a guide rod (6), and the movable iron core (7) is screwed on the guide rod (6) and capable of moving laterally. Gaps capable of moving without contacts are retained between the outer diameters of the iron core (5) and the movable iron core (7) and a primary framework winding (3). The linearity of the differential transformer can be conveniently adjusted by changing the distance between the two iron cores. According to test results, a pair of iron cores with the length as 9mm reaches a best state when the distance delta is adjusted to 1.5mm, the linearity range of the iron cores can be enlarged from +-3mm when delta is 0mm to +-5mm.
Description
Technical field
The utility model 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, 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, output voltage is zero balance point as coordinate zero point, two straight lines that slope equates with the 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 " discloses a kind of differential transformer, comprise left end cap 1, overcoat 2, elementary skeleton winding 3, secondary skeleton winding 4, unshakable in one's determination 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, two terminations are fixed on the secondary skeleton winding 4 with screw 9 respectively, 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 the screw rod with 5 threaded engagement unshakable in one's determination, 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 and right end cap 8.
It improves linear experience and method:
1, determines rational core length,, progressively shorten, find linear best length by test the slightly long iron core of design;
2, determine rational coil turn,,, gradually reduce to the reasonable number of turn by 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 every requirement all reaches 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 every 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 utility model provides a kind of two-period form two differential transformers unshakable in one's determination, with core design is two-period form, by adjust between the iron core apart from δ, can adjust the linearity of differential transformer easily.
The technical scheme that its technical problem that solves the utility model adopts 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, unshakable in one's determination 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, two terminations are fixed on the secondary skeleton winding 4 with screw 9 respectively, 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 the screw rod with 5 threaded engagement unshakable in one's determination, 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 and right end cap 8.Be characterized in also comprising that moving iron core 7, described moving unshakable in one's determination 7 and 5 outside dimensions unshakable in one's determination etc. are big, structure is identical; Described 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 beneficial effects of the utility model are: owing to be two-period form with core design, by adjust between the iron core apart from δ, reached the effect that convenience is adjusted 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 drawings and Examples the utility model is elaborated.
Description of drawings
Fig. 1 is the two differential transformer structure charts unshakable in one's determination of the utility model two-period form.
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, 1-left end cap, 2-overcoat, the elementary skeleton winding of 3-, 4-level skeleton winding, the 5-iron core, 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, L0-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 the utility model two-period form, 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, unshakable in one's determination 5 and moving unshakable in one's determination 7 periphery also comprise elementary skeleton winding 3, twice level backbone winding groups 4, 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 make 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 the adjustable iron cores in position, 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 and right end cap 8 are measure-alike, and the center is porose, and the side in the hole respectively has external diameter identical, highly are the magnetic conduction boss of a, insert 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, is supported by centre bore, and both are matched in clearance; The major diameter of thread of guide rod 6 right parts can enter 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 and 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, 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, 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, can take off left end cap 1 and guide rod 6 and reach iron core 5 and the moving iron core 7 of forming one with guide rod 6, use kind of calliper when changing the spacing of two iron cores, 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, surveys a bit every 1mm, and both sides respectively survey 5 points.
Testing procedure: begin test earlier from spacing δ unshakable in one's determination=0, progressively enlarge spacing then, its feature 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 feature that optimal spacing is measured data is the sensitivity basically identical of every millimeter displacement of each measuring point.
The test data of table 1 core length b=9mm
As seen 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 the spacing δ of two iron cores=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 high part is lowered.
3) when the spacing δ of two iron cores=2mm, whole sensitivity continues to descend, but that sensitivity became near zero point is low, away from the height at zero point, is middle concave, and this shows transfers excessively, still needs and dwindles spacing.
4) when the spacing δ of two iron cores=1.5mm, the sensitivity basically identical of each measuring point, this shows that the spacing of two iron cores is tending towards best, and its sensitivity is about 1.08v/mm, and the range of linearity extends to ± 5mm, and its linearity is better than ± 0.3%FS.
5) prove by the spacing δ=0mm of two iron cores and the test result of δ=1.5mm, with two methods that change the pitch extension range of linearity unshakable in one's determination is feasible, compare with singlecore, though sensitivity descends to some extent, but mechanical trip can make full use of, for example, two effective travels unshakable in one's determination of b=9mm are 10mm
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.Now the test result of b=8mm and b=6mm is listed in table 2.
The test result of table 2 core length b=8mm and b=6mm
As shown in Table 2, under the condition that mechanical trip allows,, should select the iron core of a pair of longer size for use, as b=9mm or b=8mm in order to obtain higher sensitivity as far as possible.
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 can make each transducer can both change the method expansion linearity of output characteristic with balance magnetic circuit error, worked hard on circuit thereby only 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) unshakable in one's determination, 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), 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, right part 2/3 is the screw rod with (5) threaded engagement unshakable in one's determination, insert respectively in the hole of left end cap (1) and right end cap (8) at guide rod (6) two ends, 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, described moving iron core (7) and (5) outside dimension unshakable in one's determination etc. are big, and structure is identical; Described 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 between the external diameter of unshakable in one's determination (5) and moving iron core (7) and the skeleton endoporus of elementary skeleton winding (3) and do not contact the gap that can move freely.
2. the two differential transformers unshakable in one's determination of two-period form according to claim 1 is characterized in that: between described 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 described 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 described iron core (5) and moving (7) unshakable in one's determination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120081193XU CN202025611U (en) | 2011-03-24 | 2011-03-24 | Dual-section type dual-iron-core differential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120081193XU CN202025611U (en) | 2011-03-24 | 2011-03-24 | Dual-section type dual-iron-core differential transformer |
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| Publication Number | Publication Date |
|---|---|
| CN202025611U true CN202025611U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120081193XU Expired - Lifetime CN202025611U (en) | 2011-03-24 | 2011-03-24 | Dual-section type dual-iron-core differential transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231316A (en) * | 2011-03-24 | 2011-11-02 | 西北工业大学 | Two-section-type double-iron-core differential transformer |
| CN104376953A (en) * | 2013-08-12 | 2015-02-25 | 广州市力琪金属制品有限公司 | Improved electromagnetic coil of novel assembly structure |
| US10247579B2 (en) | 2017-03-01 | 2019-04-02 | Honeywell International Inc. | Linear variable differential transformer (LVDT) calibration mechanism for precision rigging with vibration and accuracy tracking robustness |
-
2011
- 2011-03-24 CN CN201120081193XU patent/CN202025611U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231316A (en) * | 2011-03-24 | 2011-11-02 | 西北工业大学 | Two-section-type double-iron-core differential transformer |
| CN102231316B (en) * | 2011-03-24 | 2012-11-21 | 西北工业大学 | Two-section-type double-iron-core differential transformer |
| CN104376953A (en) * | 2013-08-12 | 2015-02-25 | 广州市力琪金属制品有限公司 | Improved electromagnetic coil of novel assembly structure |
| US10247579B2 (en) | 2017-03-01 | 2019-04-02 | Honeywell International Inc. | Linear variable differential transformer (LVDT) calibration mechanism for precision rigging with vibration and accuracy tracking robustness |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111102 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |