SU492725A1 - Device for converting movements into an electrical signal - Google Patents

Description

The invention relates to information {measurement and automation.

The known 1C 1 devices for scanning the movement into an electrical signal, built on the basis of magnetic lines (magnetic circuits with distribution parameters), contain a primary transformer or inductive converter with field windings and measuring, a power source and a unit for processing the signal transformed.

The aim of the invention is to improve the accuracy of the conversion.

For this, the magnetic circuit of the converter is made consistent, the power source is designed as a generator of rectangular pulses with a duration shorter than the time of the excitation winding, and the signal processing unit is designed as a shaping element compared to the amplitude of the power source.

The drawing shows a block diagram of the device.

A device for converting movements into an electrical signal contains a power source 1 connected to the excitation winding 2 located in the end part of the magnetic circuit 3 with a core 4. Block

5dl signal processing is connected to a movable lumped measuring winding 6 located on the magnetic conductor 3 and operating in idle mode. Winding 2 excitation and measuring

6 together with the magnetic core 3 and the core 4 form the primary transformer converter. The power source 1 is also connected to unit 5.

With the help of a winding 2 connected to the power source 1, magnetic flux pulses are excited in the matched magnetic core 3 of the primary converter, the amplitude of which decreases exponentially along the length of the line. Through the measuring winding 6, the flow pulses are converted to a direction that is exponentially variable and fed to the input of unit 5, where it is compared with a reference one proportional to the source voltage.

Power 1. The time over which the exponential voltage reaches the value of the reference voltage determines the duration of the pulses at the output of block 5 and linearly depends on the coordinate of the measuring winding 6 connected to it.

The measuring winding 6 operates in idle mode, therefore the change in the magnetic flux is transmitted (transformed) from the primary winding 2 (exciting) to the secondary 6 (measuring). However, the amplitude (steady-state) of the flow pulses in the measuring winding 6 will depend on its location; In the general case, the duration of the output pulses depends nonlinearly on the coordinate of the measuring winding 6. Therefore, given the parameters of the magnetic core 3, Zazo {-. between the main magnetic core 3 and floor 4, as well as the material and dimensions of the core 4 are chosen so that the resistance at the end of the line is equal to the wave.

Thus, when harmonizing the magnetic core 3, the duration of the output pulses coming from block 5 linearly depends on the X coordinate of the measuring winding 6, and the instability pi;

power frequency changes do not affect

on conversion accuracy.

Depending on the values of the parameters, you can get the duration of the output to them. about ten microseconds to ten milliseconds.

Delay

Claims (1)

Formula iso A device for converting movements into an electrical signal containing a transformer primary converter with excitation and measuring windings, a power supply for the excitation winding and a converter signal processing unit, characterized in that, in order to improve the conversion accuracy, the magnetic converter circuit is made consistent, the power supply is made in the form of a generator of rectangular pulses with a duration shorter than the time constant of the winding of the excitation, and the block for; signal processing made in the form. the amplifying element of this signal with a level proportional to the voltage of the power source.