KR20090002300U - Linear variable diffrential transformer in feedback coil - Google Patents

Linear variable diffrential transformer in feedback coil Download PDF

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KR20090002300U
KR20090002300U KR2020070014678U KR20070014678U KR20090002300U KR 20090002300 U KR20090002300 U KR 20090002300U KR 2020070014678 U KR2020070014678 U KR 2020070014678U KR 20070014678 U KR20070014678 U KR 20070014678U KR 20090002300 U KR20090002300 U KR 20090002300U
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coil
measuring sensor
displacement measuring
feedback
primary coil
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KR200447498Y1 (en
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문병균
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문병균
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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
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2611—Measuring inductance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
    • G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops

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  • Life Sciences & Earth Sciences (AREA)
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  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Geophysics (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

본 고안은 피드백 코일이 부가된 변위측정센서에 관한 것으로 복수 개로 구비되는 2차 코일 상간에 피드백 코일을 더 구비하여 1차 코일에 인가되는 기준신호를 모니터링하여 항상 균일한 신호가 나오도록 입력 신호를 인가하여 저항의 변화 및 주변 환경에 따른 기준출력신호의 변화를 제거하여 변위측정의 정확도 향상을 이루기 위해 제시된 것으로,The present invention relates to a displacement measuring sensor with a feedback coil, and further comprising a feedback coil between the plurality of secondary coil phases to monitor a reference signal applied to the primary coil so that an uniform signal is always output. It is proposed to improve the accuracy of displacement measurement by removing the change of resistance and the change of reference output signal according to the surrounding environment.

일정량의 코일을 포머에 권취한 1차 코일(primary coil)과 상기 1차 코일의 중심으로부터 대칭적 위치에 권취한 복수 개의 2차 코일 및 1차 코일과 2차 코일 상간으로 자성체를 가지는 코어로 구성된 변위측정센서를 구성함에 있어서;It consists of a primary coil wound around a certain amount of coil in a former, a plurality of secondary coils wound in a symmetrical position from the center of the primary coil, and a core having a magnetic body between the primary coil and the secondary coil. In constructing a displacement measuring sensor;

상기 변위측정센서는 복수 개의 2차 코일 상간으로 피드백 코일을 더 구비하는 것을 특징으로 한다.The displacement measuring sensor may further include a feedback coil between a plurality of secondary coil phases.

LVDT, 피드백 LVDT, feedback

Description

피드백 코일이 부가된 변위측정센서{Linear variable diffrential transformer in feedback coil}Linear variable diffrential transformer in feedback coil

본 고안은 피드백 코일이 부가된 변위측정센서에 관한 것으로 더욱 상세하게는 자속의 변화를 통해 변위를 감지하는 변위측정센서에 있어서; 상기 변위측정센서에 2차코일 상간으로 피드백 코일을 부가하여 균일한 입력신호부여와 이로 인한 고정밀도의 변위측정이 가능하도록 한 변위측정센서의 개선안에 관한 것이다.The present invention relates to a displacement measuring sensor to which a feedback coil is added, and more particularly, to a displacement measuring sensor detecting a displacement through a change in magnetic flux; The present invention relates to an improvement of the displacement measuring sensor in which a feedback coil is added to the displacement measuring sensor between secondary coil phases so as to provide uniform input signal and thereby high-precision displacement measurement.

일반적으로 변위측정센서는 LVDT(Linear Variable Differential Transformer)로 지칭되며, 기계적 변위를 전기적인 신호로 변환하는 코어의 이동으로 1차 코일(primary coil)에서 2차 코일(secondary coil)에 유도되는 자속의 변화로서 전기적 출력이 발생되며, 이러한 전기적 출력을 아날로그 또는 디지털로 표시하여 변위값을 측정한다.In general, displacement measuring sensors are referred to as linear variable differential transformers (LVDTs). An electrical output is generated as a change, and the electrical output is displayed in analog or digital form and the displacement value is measured.

이와 같은 변위측정센서는 도 1에서와 같이 일정량의 코일을 포머에 권취한 1차 코일(primary coil;10)과 상기 1차 코일(10)의 중심으로부터 대칭적 위치에 코일을 권취한 복수 개의 2차 코일(20) 및 1차 코일(10)과 2차 코일(20) 상간으로 자성체를 가지는 코어(30)로 구성된다.Such a displacement measuring sensor includes a primary coil 10 wound around a predetermined amount of coils in a former as shown in FIG. 1 and a plurality of coils wound around a coil in a symmetrical position from the center of the primary coil 10. It is composed of a core 30 having a magnetic material between the primary coil 20 and the primary coil 10 and the secondary coil 20.

상기 1, 2차 코일을 권취한 포머는 원통형으로 구비되며, 코어는 변위측정센서 외방으로 돌출된 샤프트와 체결된다.The former winding the primary and secondary coils is provided in a cylindrical shape, the core is fastened to the shaft protruding out of the displacement measuring sensor.

이러한 변위측정센서는 자성체 코어의 움직임으로 인해 각각의 2차 코일에서 발생되는 유기전압(induced voltage)을 유도하는 1차와 2차 코일의 상호 인덕턴스(inductance)를 변하게 하여 기계적 변위를 감지한다.The displacement sensor detects mechanical displacement by changing mutual inductances of the primary and secondary coils, which induce induced voltage generated in each secondary coil due to the movement of the magnetic core.

상기 변위측정센서는 코어와 코일 사이에 실질적인 접촉이 없기 때문에 센서작동으로 인한 기계적인 마모가 발생하지 않으며, 이는 곧 출력에 영향을 주는 마찰이 적기 때문에 응답특성을 높일 수 있고 과부하에 의한 영향이 없는 특징을 가진다.Since the displacement measuring sensor does not have a substantial contact between the core and the coil, there is no mechanical wear due to the sensor operation, which may increase the response characteristic because there is little friction affecting the output, and there is no influence of the overload. Has characteristics.

하지만, 상기 변위측정센서의 경우 도 2에서와 같이 기준신호(reference signal)을 직접 1차 코일(10)에 인가함으로써 1차 코일(10)의 저항(impedence)변화 및 주변 환경에 따라 인가되는 기준신호가 변화할 수 있으므로 인해 2차 코일에 유도되는 기전력의 변화로 측정의 오류가 발생하는 문제점을 안고 있었다.However, in the case of the displacement measuring sensor as shown in Figure 2 by applying a reference signal (reference signal) directly to the primary coil 10, the reference applied according to the change (impedence) of the primary coil 10 and the surrounding environment Since the signal may change, the measurement error is caused by the change of electromotive force induced in the secondary coil.

이에 본 고안에서는 상기한 문제점을 해결하기 위한 것으로, 복수 개로 구비되는 2차 코일 상간에 피드백 코일을 더 구비하여 1차 코일에 인가되는 기준신호를 모니터링하여 항상 균일한 기준 출력이 되도록 입력파형을 인가하여 저항의 변화 및 주변 환경에 따른 기준신호입력의 변화를 제거하여 변위측정의 정확도 향상을 그 목적으로 한다.Accordingly, the present invention is to solve the above problems, by further comprising a feedback coil between the plurality of secondary coil phases to monitor the reference signal applied to the primary coil to apply an input waveform so that the reference output is always uniform. The purpose of this paper is to improve the accuracy of displacement measurement by eliminating the change of resistance and the change of reference signal input according to the surrounding environment.

본 고안이 적용된 변위측정센서는 일정량의 코일을 권취한 1차 코일(primary coil)과 상기 1차 코일의 중심으로부터 대칭적 위치에 코일을 권취한 복수 개의 2차 코일 및 1차 코일과 2차 코일 상간으로 자성체를 가지는 코어로 구성된 변위측정센서를 구성함에 있어서;The displacement measuring sensor to which the present invention is applied includes a primary coil winding a predetermined amount of coils, and a plurality of secondary coils, primary coils and secondary coils wound around a coil in a symmetrical position from the center of the primary coil. In constructing a displacement measuring sensor consisting of a core having a magnetic body between phases;

상기 변위측정센서는 복수 개의 2차 코일 상간으로 피드백 코일을 더 구비하는 것을 특징으로 한다.The displacement measuring sensor may further include a feedback coil between a plurality of secondary coil phases.

이상과 같은 본 고안인 피드백 코일이 부가된 변위측정센서는 피드백 코일로 인하여 기준출력(피드백)신호의 안정화를 도모하여 출력 신호의 일정한 패턴 유지를 통해 정밀한 변위측정이 가능하다.The displacement measuring sensor to which the feedback coil of the present invention is added as described above enables a stable displacement measurement by maintaining a constant pattern of the output signal by stabilizing the reference output (feedback) signal due to the feedback coil.

나아가, 동일 위치에서 출력 신호의 흔들림이 감소하며 반복 정도 및 선형성의 개선을 통한 측정 신뢰도를 향상시킬 수 있는 유용한 고안이다.Furthermore, it is a useful design that can reduce the shaking of the output signal at the same position and improve the measurement reliability by improving the repeatability and linearity.

본 고안인 피드백 코일이 부가된 변위측정센서는 1차 코일(primary coil;40)과, 상기 1차 코일(40)과 대칭적 위치에 복수 개로 형성되는 2차 코일(50), 상기 복수 개의 2차 코일(50) 상간으로 피드백 코일(60)을 더 구비하며, 상기 1차 코일(40)과 2차 코일 상간(50)으로 자성체를 가지며 개재되는 코어(70)로 구성된다.The displacement measuring sensor with the feedback coil according to the present invention includes a primary coil 40, a secondary coil 50 formed in plural in a symmetrical position with the primary coil 40, and the plurality of two coils. It further includes a feedback coil 60 between the primary coil 50 phase, and is composed of a core 70 having a magnetic material interposed between the primary coil 40 and the secondary coil phase 50.

이하 첨부되는 도면과 관련하여 본 고안의 구성 및 작용에 대하여 설명하면 다음과 같다.Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

도 3은 본 고안이 적용된 피드백 코일이 부가된 변위측정센서의 개략도, 도 4는 본 고안이 적용된 피드백 코일이 부가된 변위측정센서의 작동관계를 도시한 회로도로서 함께 설명한다.3 is a schematic diagram of a displacement measuring sensor to which a feedback coil to which the present invention is applied, and FIG. 4 is a circuit diagram illustrating an operation relationship of a displacement measuring sensor to which a feedback coil to which the present invention is applied.

도 3은 피드백 코일이 부가된 변위측정센서를 도시한 개략적 구성도로서,3 is a schematic diagram illustrating a displacement measuring sensor to which a feedback coil is added;

변위측정센서는; 변위측정센서의 용도와 감지성능 등을 고려하여 일정량의 코일을 권선하여된 1차 코일(primary coil;40)을 구비한다.Displacement measuring sensor; A primary coil 40 is wound around a predetermined amount of coils in consideration of the use of the displacement measuring sensor and detection performance.

상기 1차 코일(40)의 중심을 기점으로 상,하(도면상) 대칭적 위치에 2차 코일(50)이 복수 개로 구비되며, 나아가 이러한 복수 개의 2차 코일 상간(50)에는 피드백 코일(60)을 더 구비한다. 물론 이 때 피드백 코일(60)은 2개의 2차 코일(50) 중심에 위치하는 것은 당연하다 할 것이다.A plurality of secondary coils 50 are provided at upper and lower symmetrical positions based on the center of the primary coil 40, and further, a plurality of secondary coils 50 may be provided with feedback coils. 60). Of course, at this time, the feedback coil 60 is naturally located at the center of the two secondary coils 50.

이와 같이 구성된 변위측정센서는 1차 코일(40)과 2차 코일(50) 사이에 자성체의 코어(70)를 개재하여 변위측정이 가능하도록 한다.The displacement measuring sensor configured as described above allows displacement measurement between the primary coil 40 and the secondary coil 50 via the core 70 of the magnetic material.

상기와 같이 구성된 본 고안인 피드백 코일이 부가된 변위측정센서는,Displacement measuring sensor is added to the feedback coil of the present invention configured as described above,

도 4는 피드백 코일이 부가된 변위측정센서의 작동관계를 도시한 회로도에서와 같이 피드백 코일에 의한 피드백 서킷(feedback circuit)을 구성하여 기준신호를 1차 코일에 인가하고, 이어 피드백 코일의 신호를 확인하여 1차 코일에 입력되는 신호와 비교하여 피드백 코일에 유도되는 신호를 안정화시키게 된다.FIG. 4 configures a feedback circuit by the feedback coil and applies a reference signal to the primary coil, as shown in a circuit diagram showing an operation relationship of a displacement measuring sensor with a feedback coil. As a result, the signal induced in the feedback coil is stabilized in comparison with the signal input to the primary coil.

이와 같이 피드백 코일을 이용하여 피드백 코일의 출력신호를 비교 분석함으로써 피드백 코일 유도되는 신호를 일정하게 유지할 수 있으며, 이는 곧 센서 전반의 작동성 향상을 도모하여 측정의 정밀도 향상을 동시에 수행할 수 있는 특징을 가진다.By comparing and analyzing the output signal of the feedback coil using the feedback coil as described above, the signal induced by the feedback coil can be kept constant, which is a feature that can simultaneously improve the accuracy of measurement by improving the operability of the overall sensor. Has

도 1은 종래 기술이 적용된 변위측정센서의 개략도,1 is a schematic diagram of a displacement measuring sensor to which the prior art is applied;

도 2는 종래 기술이 적용된 변위측정센서의 작동관계를 도시한 회로도,2 is a circuit diagram showing an operation relationship of a displacement measuring sensor to which the prior art is applied;

도 3은 본 고안이 적용된 피드백 코일이 부가된 변위측정센서의 개략도,3 is a schematic diagram of a displacement measuring sensor to which a feedback coil to which the present invention is applied;

도 4는 본 고안이 적용된 피드백 코일이 부가된 변위측정센서의 작동관계를 도시한 회로도.Figure 4 is a circuit diagram showing the operation relationship of the displacement measuring sensor with a feedback coil to which the present invention is applied.

*도면의 주요 부분에 사용된 부호의 설명** Description of the symbols used in the main parts of the drawings *

40;1차 코일40; primary coil

50;2차 코일50; secondary coil

60;피드백 코일60; feedback coil

70;코어70; core

Claims (2)

일정량의 코일을 권취한 1차 코일(primary coil)과 상기 1차 코일의 중심으로부터 대칭적 위치에 코일을 권취한 복수 개의 2차 코일 및 1차 코일과 2차 코일 상간으로 자성체를 가지는 코어로 구성된 변위측정센서를 구성함에 있어서;It consists of a primary coil winding a certain amount of coil and a plurality of secondary coils wound around a coil in a symmetrical position from the center of the primary coil, and a core having a magnetic body between the primary coil and the secondary coil. In constructing a displacement measuring sensor; 상기 변위측정센서는 복수 개의 2차 코일(50) 상간으로 피드백 코일(60)을 더 구비하는 것을 특징으로 하는 피드백 코일이 부가된 변위측정센서.The displacement measuring sensor is a displacement measuring sensor with a feedback coil, characterized in that further comprising a feedback coil (60) between the plurality of secondary coil (50) phase. 제 1 항에 있어서;The method of claim 1; 사이 변위측정센서는 피드백 신호를 받아 기준출력을 일정하게 유지하도록 하는 것을 특징으로 피드백 코일이 부가된 변위측정센서.Displacement measuring sensor is a displacement measuring sensor with a feedback coil, characterized in that to maintain a constant reference output by receiving a feedback signal.
KR2020070014678U 2007-09-03 2007-09-03 Linear variable diffrential transformer in feedback coil KR200447498Y1 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
KR101984905B1 (en) * 2019-04-04 2019-05-31 파크전자(주) linear variable differential transformer
WO2019112122A1 (en) * 2017-12-08 2019-06-13 단국대학교 산학협력단 Variable stiffness system using phase plane and method for controlling same

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KR20010087621A (en) * 2000-03-08 2001-09-21 권영섭 Displacement Measurement Apparatus And Method Having A Linear Variable Differential Trans former
JP2002113420A (en) 2000-10-10 2002-04-16 Kayaba Ind Co Ltd Controlling device for shaker
US6669909B2 (en) 2001-03-26 2003-12-30 Allegro Technologies Limited Liquid droplet dispensing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019112122A1 (en) * 2017-12-08 2019-06-13 단국대학교 산학협력단 Variable stiffness system using phase plane and method for controlling same
KR101984905B1 (en) * 2019-04-04 2019-05-31 파크전자(주) linear variable differential transformer

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