SU987372A1

SU987372A1 - Linear displacement pickup

Info

Publication number: SU987372A1
Application number: SU813265497A
Authority: SU
Inventors: Юнис Аббасали Оглы Махмудов; Тофик Ибрагим Оглы Ибрагим-Заде; Габиль Ханбаба Оглы Алиев; Тариель Ага-Али Оглы Бадалов; Вагиф Фейруз Оглы Эфендиев
Original assignee: Институт Кибернетики Ан Азсср
Priority date: 1981-08-10
Filing date: 1981-08-10
Publication date: 1983-01-07

Description

(54) ДАТЧИК ЛИНЕЙНЫХ ПЕРЕМЕЩЕНИЙ(54) LINEAR MOVEMENT SENSOR

1one

Изобретение относитс к измерительной технике и может быть использовано дл измерени линейных перемещений различных объектов, например в нефт ной промьшшенности дл измерени хода штока балансира станка-качалки глубинных штанговых насосов и т.п. The invention relates to a measurement technique and can be used to measure linear movements of various objects, for example, in the oil industry to measure the stroke of the balance bar of a pumping unit of deep-well sucker-rod pumps, etc.

Известны-преобразователи перемещений индукционного типа, содержащие магнитопровод с первичной и вторичной обмотками и подвижный элемент , например ферромагнитный сердечник 1.Known transducers of the induction type, containing a magnetic core with primary and secondary windings and a movable element, such as a ferromagnetic core 1.

Недостатком их вл етс чувствительность к искажению форим питающего напр жени и к изменению магнитной проницаемости сердечника, которые ухудшают точность измерени перемещений.Their disadvantage is their sensitivity to distortion of the feed voltage and to changes in the magnetic permeability of the core, which degrade the accuracy of the measurement of displacements.

Наиболее«Ллизким техническим решением к изобретению вл етс датчик линейных перемещений, содержащий два взаимно перпендикул рных магнитопровода с размещенными на них обмоткой возбуждени и измерительными обмотками . Обмотка возбуждени размещена на центральном стержне магнитопроводов , а измерительные обмотки на крайних стержн х обоих магнитопроводов . Благодар взаимно перпендикул рному расположению этих магнитопроводов отсутствует взаимоиндуктивна св зь между парами измерительных обмоток. Подвижныгл злементом датчика вл етс ферромагнитна пластина , размещенна у открытых торцов магнитопроводов .The most close technical solution to the invention is a linear displacement sensor containing two mutually perpendicular magnetic cores with an excitation winding and measuring windings placed on them. The excitation winding is located on the central core of the magnetic cores, and the measuring windings on the extreme cores of both magnetic cores. Due to the mutually perpendicular arrangement of these magnetic cores, there is no mutually inductive connection between the pairs of measuring windings. The movable element of the sensor is a ferromagnetic plate placed at the open ends of the magnetic cores.

Недостатком датчика вл етс ог10 раниченна помехозащищенность, а следовательно , и точность, обусловленные вли нием искажени формы кривой питающего напр жени и температурной нестабильностью магнитной проницае15 мости сердечника магнитопровода.The disadvantage of the sensor is limited noise immunity, and consequently, accuracy, due to the influence of the distortion of the shape of the supply voltage curve and the temperature instability of the magnetic permeability of the core of the magnetic core.

Целью изобретени вл етс повышение точности датчика.The aim of the invention is to improve the accuracy of the sensor.

Claims

To achieve this goal, the linear displacement sensor is provided with a DC bias winding and a capacitor, the excitation winding is placed on one of the magnetic cores connected to the object to be monitored 25 during the measurement process, the measuring winding and the DC bias winding are placed on the second magnetic conductor, and the capacitor connected in parallel 30 measuring winding. The drawing shows a schematic diagram of a linear displacement sensor. It contains two U-shaped headsets 1 and 2 placed mutually perpendicularly at a distance from one another. On one of them is placed the excitation winding 3, connected to the source 4 of the alternating current voltage. On the second magnetic circuit, there is a DC bias winding 5, connected to a DC voltage source, and a measuring cord 7. A capacitor 8 and a recording device 9 are connected to the terminals of the measuring winding. The linear displacement sensor operates as follows. When an alternating current voltage is applied to the winding 3 of the sensor in the magnetic core 1, a magnetic flux F occurs, which is injected through the air between the open ends of this magnetic conductor. A part of this flow, depending on the distance between the two magnetic cores 1 and 2, responds to the second magnetic conduit 2, but this part of the flux F does not produce a useful signal, depending on the displacement of the magnetic conductor 1, in the measuring winding 7, since it does not intersect its turns due to the mutually perpendicular arrangement of magnesium of the conductors 1 and 2 and windings 3 and 7, but this affects the magnetic resistance of the magnetic circuit 2, as a result, the inductance of the measuring winding If Consequently, it changes and. the voltage that occurs at the output of the sensor due to the parametric generation effect, which is monitored by the recording device 9. The smaller the distance between the magnetic cores 1 and 2, the stronger the magnetic resistance of the magnetic core 2 and the greater the output voltage of the sensor. Due to the presence of a DC bias winding, an adjustable DC bias of the core of the magnetic core 2 is realized, resulting in an increase in the steepness of the output characteristic of the sensor. Due to the fact that the output voltage of the sensor is created as a result of parametric generation, it does not depend on the distortion of the form of the throttle voltage. Thus, the sensor is insensitive to the effect of interference due to its excitation, thereby increasing its accuracy. DETAILED DESCRIPTION OF THE INVENTION Linear displacement sensor comprising two mutually perpendicular magnetic conductors with an excitation winding and a measuring winding placed on them, characterized in that, in order to improve accuracy, it is provided with a DC bias winding and a capacitor, the excitation winding is placed on one of the magnetic conductors with a controlled object during the measurement, the measuring winding and the DC bias winding are placed on the second magnetic circuit, and the capacitor is connected parallel flax measuring winding. Sources of information taken into account during the examination 1.Kulikovskiy L.F. Inductive displacement meters. ML, Gosenergoizdat, 1961, p. thirty.

2. Authors certificate of the USSR 665202, cl. G 01 B 7/00, 1975 (npo-f totype).

From oSbCKma. measured 1

from

X

/.