SU1354028A1 - Measuring circuit for transmitting information from rotating articles - Google Patents

Abstract

The invention relates to an information-measuring technique and is intended for converting passive complex values of primary transducers, for example, resistance strain gages. Measuring - the circuit for transmitting information from rotating products contains tensorizers 1,2, rotating transformers 3, 6, 9 with rotor and stator windings and a source 12 of harmonic signals. The invention improves the sensitivity and accuracy of the measuring circuit. 1 il. WITH

Description

 135402

The invention relates to information and measuring technology and is intended to convert passive complex values of primary measuring transducers (for example, strain gages) located on rotating products.

The purpose of the invention is to increase the sensitivity and accuracy of the measuring circuit 10 by introducing additional rotating transformers and appropriate connection of their windings.

The drawing shows a functional measuring circuit. 15

The measuring circuit contains two strain gauges 1 and 2, the first rotating transformer 3 with rotor winding 4 and the stator winding 5, the second rotating transformer 6 with ro-20 which on the stator windings 5 and 11 with the winding 7 and stator winding 8, the third rotating transformer 9 with The rotor winding 10 and the stationary winding 11 and the source 12 of harmonic signals, the rotor windings of rotary transformers 3 and 9 are made with output from the midpoint, the beginning of the rotor winding 4 is connected to the end of the rotor winding 10 and the first Here, the strain gauge 1, the start of the rotor winding AO is connected to the first output tensor of the resistor 2, the start of the rotor winding 7 is connected to the middle terminals of the rotor windings 4 and 10, the ends of the rotor windings 4 and 7 are combined with the second leads of the strain gauges 1 and 2, the second output of the source 12 harmonic signals are connected to the end of the stator winding 8, the first is connected to the common bus and the beginning of the stator winding 8, the stator windings 5 and J are counter-connected in series, the end of the stator winding 5 is connected to the first output terminal and the common bus, Starter stator winding 11 - with the second output terminal.

The operation of the measuring circuit is as follows.

The nominal resistances of the strain gauges 1 and 2 are selected in such a way that the amplitude of the output voltage of the measuring circuit is zero when exposed to voltage from a source of 12 harmonic signals and there is no disturbing effect on the parameters of the strain gauges 1 and 2.

The increase in resistance of the tensor-eistor 1 must correspond to

a voltage appears, the amplitude of which is the measurement information signal, and the phase difference is 180. Counter start

The 25 stator windings 5 and 11 allow to double the signal of the measurement information and at the same time compensate for common-mode noise induced in these windings.

30 When the non-contact intermediate converter rotates, its inductance, or transformation ratio, of rotary transformers 3.6 and 9 changes, and voltage across the windings 5 and 11 appears voltage shifted in phase by 180 relative to the voltage of the source 12 of harmonic signals. Since the parameters of the rotating transformation 40 tori 3 are identical, and the stator windings 5 and J are switched in opposite, the parasitic voltage arising from the rotation of the contactless intermediate transformer is compensated, which corresponds to the constant of its transformation ratio.

Thus, the introduction of additional.

gQ solid rotary transformers with the summation of magnetic fluxes, the counter-switching of their windings, the connection of two primary measuring transducers without the use of

 exemplary elements and synchronous detection allows to more than double the sensitivity and significantly improve the accuracy of information transmission from rotating products.

decrease in resistance of the strain gauge 2 when exposed to measured values.

An increase in the resistance of the strain resistor 1 leads to a decrease in the magnetic flux in the first half of the rotor winding A and in the second half of the rotor winding 10. A decrease in the resistance of the resistor 2 leads to an increase in the magnetic flux in the second half of the rotor winding 10. Since in each of the rotor windings 4 and 10, the magnetic fluxes corresponding to the resistance of the resistance strain gages 1 and 2 are counter-directed, an algebraic summation of these flows occurs, as a result

which is on stator windings 5 and 11

a voltage appears, the amplitude of which is the measurement information signal, and the phase difference is 180. Counter start

The stator windings 5 and 11 allow to double the signal of the measurement information and at the same time compensate for common-mode noise induced in these windings.

When the contactless intermediate converter is rotated, its inductance, or transformation ratio, of rotating transformers 3.6 and 9 changes, and a voltage shifted in phase by 180 relative to the voltage of the source 12 of harmonic signals appears on the stator windings 5 and 11. Since the parameters of the rotating transformers 3 are identical, and the stator windings 5 and J are switched in opposite, the parasitic voltage arising from the rotation of the non-contact intermediate transformer is compensated, which corresponds to the constant of its transformation ratio.

Thus, the introduction of additional.

rotary transformers with the summation of magnetic fluxes, the counter-inclusion of their windings, the connection of two primary measuring transducers without the use

exemplary elements and synchronous filtering allows more than two to increase sensitivity and significantly improve the accuracy of information transfer from rotating products.

Claims (1)

Invention Formula A measuring circuit for transmitting information from rotating products, comprising a rotating transformer, a source of harmonic signals and a first strain gauge, the first output of the source of harmonic signals being connected to the first output terminal and the common bus, so as to increase sensitivity and accuracy In addition, two rotating transformers and a second strain gauge are added to it, with the average inputs of the rotor windings of the first and third rotating transformers connected to the beginning of the rotor The windings of the second rotating transformer, the ends of the rotor windings of the first and second rotates of the first rotating transformers of the first rotating transformers are connected to the first transformer — from the first to the first terminals of both of the strain-relief terminals. Editor A. Shandor Compiled by V. Bykov Tehred L. Oliynyk Order 5682/35 Circulation 677 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 tori, the beginning of the rotor winding of the first rotating transformer and the end of the rotor winding of the third rotating transformer are connected to the second output of the first strain gage, the beginning of the rotor winding of the third rotating transformer is connected to the second output of the second tensor resistor, the second output of the harmonic signal source is connected to the end of the second winding transformer rotary transformer, and the first - with its beginning, the stator windings of the first and third rotary transformers are connected oppositely tion, wherein the third end of the stator winding of the rotary transformer is connected to the second output terminal, and koKorrektor S.Cherni