SU439688A1 - Electroinductive linear displacement transducer - Google Patents

Description

(54) ELECTRIC-INDUCTIVE LINEAR CONVERTER

DISPLACEMENT

one

The known electroinductive linear displacement transducers, based on the change in the impedance of the transducer coils during core movement, contain stimulating coils, a power source, movable measles located between the coils, a rod for moving the core interacting with the moving body, a signal recording and display unit from the coils. However, the known electroinductive transducers have low sensitivity with small movements of the object being monitored, and to increase the sensitivity, it is necessary to increase the dimensions of the transducer, the active core area and the exciting coils, which greatly complicates the design of the transducer and recording devices.

The proposed transducer differs from the known ones in that it is provided with additional excitation coils, all the coils are located around the circumference with the same gap relative to the core, made in the form of a ring, rigidly connected at diametrically opposite points with the transducer case and with a movable rod.

Such an embodiment of the converter allows to increase its sensitivity.

The drawing shows the proposed Converter.

The converter includes a housing I, excitation coils 2 located circumferentially with the same clearance relative to the core 3, and a movable rod 4 interacting with a moving body (not shown in the drawing).

The converter works as follows.

The moving body acts on the rod, which, in turn, deforms ring-shaped measles, the various interaction of the latter with circumferential transducer coils due to the appearance of signals recorded by the recording and display unit. When measuring extremely small displacements in the recording circuit, a harmonic analyzer can be used, which analyzes the part of the signal spectrum from the coils that carries information about the voltages occurring in the material of the annular core when subjected to small displacements. At the same time, the frequency of the power coil of the current converter is selected corresponding to the highest measurement sensitivity.

Subject invention

An electroinductive linear displacement transducer containing excitation coils, a power source, movable measles located between the coils, a rod for moving the core interacting with the body to be moved, a signal recording and display unit from the coils, which is equipped with additional excitating coils, all the coils are arranged circumferentially with the same gap relative to the core, made in the form of a ring, rigidly connected in diametrically opposed spurious points with a converter housing and a moving rod.