CN85100150A - Long core differential transformer - Google Patents
Long core differential transformer Download PDFInfo
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- CN85100150A CN85100150A CN 85100150 CN85100150A CN85100150A CN 85100150 A CN85100150 A CN 85100150A CN 85100150 CN85100150 CN 85100150 CN 85100150 A CN85100150 A CN 85100150A CN 85100150 A CN85100150 A CN 85100150A
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- differential transformer
- magnetic core
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- long
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Abstract
Long core differential transformer is to be used for the differential transformer displace that little displacement measurement is used.It makes the general raising of linear precision of little displacement measurement.Its major technique feature is that the magnetic core in the differential transformer is longer than the total length of coil.Its result generally significantly improves linear precision.Long core differential transformer can directly become non-contact displacement transducer again.It can be used for the non-contact measurement of little displacement.It has the linear output character of displacement measurement and the differential compensation ability of temperature, so it need not to carry out in addition linearity and temperature-compensating.
Description
The present invention is the invention that is used for the differential transformer that little displacement measurement uses.
Existing tubular differential transformer, the differential mapping mode of J57-59116(for example) patent all is that coil is longer than movable magnetic core wherein, the linear precision of its Displacement Measurement is subjected to the influence of coil winding quality and magnetic core surface state very big, and it is very difficult to produce the high accuracy differential transformer by batch with prior art.Can only obtain minority high accuracy product behind the product screening, general precision and low precision product then occupy the majority.Therefore the high accuracy differential transformer always brings a high price.Existing in addition tubular differential transformer also is not used in the non-cpntact measurement of displacement.U.S.P3609527(NONCONTACTING PROXIMITY GAGE UTILI-ZING INDUCED EDDY CURRENTS, HAVING IMPROVED DY-NAMIC RESPONSE AND INTERFERE NCE DISCRIMINATION) though patent has been introduced transformer type non-contacting position discriminator, but it is an air-core transformer, it does not have magnetic core, not longer magnetic core.It adopts the purpose of differential coil is that the width of cloth blackberry lily that is used for anti-reactor is disturbed usefulness.This air-core transformer can not simply obtain linear output in non-contact displacement measurement.Existing electric whirlpool formula non-contact displacement transducer all has non-linear output characteristic, all need add linearity circuit and temperature-compensation circuit.
The objective of the invention is in order simply to produce the differential transformer of high linear precision by batch, and reduce production costs.Another object of the present invention is to make the differential transformer displace that is used for little displacement non-contact measurement.
Fig. 1 is the structure chart of existing tubular differential transformer, and wherein the axial length of magnetic core is shorter than the length overall of coil.The present invention to lengthening, makes core axis it surpass the length that the length overall that is placed in its outer coil surpasses coiler part and should approach required linearity measuring range.For example required linearity measuring range is ± 1mm that magnetic core should be than the long 2mm of coil total length.So just obtain long core differential transformer of the present invention.The secondary coil of existing differential transformer is to be in its non-uniform magnetic field of lacking magnetic core to work, and the secondary coil of long core differential transformer of the present invention works in the uniform magnetic field.Therefore advantage of the present invention is: the displacement transducer that obtains high linear precision easily.It is very low to the requirement of magnetic core surface state in addition, no matter is to use ganoid cylinder shape magnetic core, still uses screwed cylinder shape magnetic core, can produce the long core differential transformer formula displacement transducer of high linear precision equally.
As long as the movable long magnetic core in the long core differential transformer is mixed up in coil position, become it and coil stationary Immobile together then, and place one non-contactly at an end of transformer 11 and can approach mobile tested metallic object, just obtain contactless long core differential transformer formula displacement transducer of the present invention.It can carry out non-contact measurement to the little displacement of metallic object.In order to improve resolution, can in the output circuit of differential transformer, insert amplifier earlier and amplify.The advantage of this contactless long core differential transformer formula displacement transducer is: it has the right linear output character of order and to the differential compensation ability of temperature effect, so it need not to carry out linearity correction and temperature-compensating as existing non-contact displacement transducer.
Fig. 2 b is the embodiment of long core differential transformer displacement transducer.Driving source 5 puts on high-frequency signal in the long core differential transformer primary winding 2 and produces high frequency magnetic field, coupling by long magnetic core 1 generates electromotive force in two secondary coils 3 and 4, after passing through diode 6,7 and filter 8,9 again, differential output dc voltage.This voltage is proportional to magnetic core with respect to axial displacement that coil took place.Magnetic core is made of the cylindrical FERRITE CORE of high permeability.
Fig. 3 is the embodiment of contactless long core differential transformer formula displacement transducer.Long magnetic core 1 in the differential transformer is fixed together with coil 2,3,4 after mixing up the position.Wherein 14 is tested metallic objects, and other circuit part is with Fig. 2 b.
Fig. 4 is the embodiment of the contactless long core differential transformer of high-resolution.Differential transformer secondary output signal is passed through earlier after the amplification of an amplifier 10, rectification again, filtering and differential output.
Claims (3)
1, the length of the cylindrical movable magnetic core 1 in the existing tubular differential transformer coil is shorter than the total length of coil 2,3 and 4.Feature of the present invention is that the length of the cylindrical movable magnetic core 1 in the tubular differential transformer coil is longer than the total length of coil 2,3 and 4, and its value of being longer than the coil length overall should be approximately equal to required linearity measuring range.
2, the elongated cylindrical magnetic core of narrating according to claim 1 is characterized in that the magnetic core surface both can be smooth, also can be screwed.
3, movable long magnetic core 1 in the long magnetic core differential transformer of narrating according to claim 1 and coil 2,3,4 be fixed together become movable after, the feature of its purposes is the non-contact measurement that is used for little displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100150 CN85100150A (en) | 1985-04-01 | 1985-04-01 | Long core differential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100150 CN85100150A (en) | 1985-04-01 | 1985-04-01 | Long core differential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85100150A true CN85100150A (en) | 1986-07-30 |
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ID=4790928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85100150 Pending CN85100150A (en) | 1985-04-01 | 1985-04-01 | Long core differential transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100150A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105120A (en) * | 2011-10-07 | 2013-05-15 | 比尔克特韦尔克有限公司 | Contact displacement sensor and method for contactless distance measurement |
| CN104697427A (en) * | 2014-12-12 | 2015-06-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Differential transformer type inductance displacement sensor composed of multiple coils |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| 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 |
| CN107110667A (en) * | 2014-09-19 | 2017-08-29 | 克诺尔商用车制动系统有限公司 | Electric signal input unit with convergent or diverging oscillation circuit signal |
-
1985
- 1985-04-01 CN CN 85100150 patent/CN85100150A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105120A (en) * | 2011-10-07 | 2013-05-15 | 比尔克特韦尔克有限公司 | Contact displacement sensor and method for contactless distance measurement |
| US9052178B2 (en) | 2011-10-07 | 2015-06-09 | Burkert Werke Gmbh | Contactless distance measuring sensor and method for contactless distance measurement |
| CN103105120B (en) * | 2011-10-07 | 2015-09-16 | 比尔克特韦尔克有限公司 | Non-contact displacement transducer and non-contact type displacement measurement method |
| CN107110667A (en) * | 2014-09-19 | 2017-08-29 | 克诺尔商用车制动系统有限公司 | Electric signal input unit with convergent or diverging oscillation circuit signal |
| CN107110667B (en) * | 2014-09-19 | 2019-09-03 | 克诺尔商用车制动系统有限公司 | Electric signal input unit with convergent or diverging oscillation circuit signal |
| CN104697427A (en) * | 2014-12-12 | 2015-06-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Differential transformer type inductance displacement sensor composed of multiple coils |
| CN104697427B (en) * | 2014-12-12 | 2017-06-09 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of differential transformer type inductance displacement sensor being made up of multiple coils |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| 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 |
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| WD01 | Invention patent application deemed withdrawn after publication |