SU1499497A2 - Shaft angle digitizer - Google Patents

Abstract

The invention relates to the field of automation and computing. The purpose of the invention is to improve the accuracy of converting the angle of rotation of the shaft into a code by compensating for the temperature error of a phase shifter with an annular transformer. The goal is achieved in that the device containing the quadrature voltage source 1, phase shifter 2, first 4, second 6, third 8, fourth 10 keys, driver 12 pulses, control unit 13, pulse generator 14, first 15, second 16 elements And, counter 17, register 18, the fifth 5, sixth 7, seventh 8, eighth 11 keys, amplitude detector 3 and thermistors 19, 20 are additionally introduced. The introduction of new elements allows the formation of a variable threshold of the pulse shaper 12, which allows change time mennye intervals between start and stop pulses at the output of the pulse shaper 12 as a function of phase value and the voltage between the output signals of the carrier frequency phase shifter 2, thereby compensating for the temperature error of the phase shifter 2. 1 yl.

Description

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The invention relates to automation and computing, is an improvement of the invention on the author. No. 922853, and contains all the features of this invention.

The aim of the invention is to improve the accuracy of the converter angle of rotation of the shaft into the code by compensating for the temperature error of the rotator with an annular transformer.

The drawing shows a structural diagram of the converter angle of rotation of the shaft in the code.

The converter contains a source of 1 quadrature voltage, a phase shifter 2, an amplitude detector keys 4-11, a driver 12 pulses, a control unit 13, a pulse generator 14, elements 15 and 16, a counter 17, a register 18, thermal elements on thermistors 19 and 20 .

The converter works as follows.

From source 1, quadrature voltages are applied to the inputs of phase shifter 2. In this case, at the outputs of the phase shifter 2, quadrature voltages appear that are shifted relative to the voltages of source 1 and the voltages on thermistors 19 and 20 by the angle of rotation of the shaft of the phase shifter 2. Voltages from resistors 19 and 20 and output windings are fed to keys 4 , 6, 8, and 10. The voltage levels compared to the voltages supplied from thermistors 19 and 20 and from the output windings of the phase shifter are fed to keys 5, 7.9, and 11.

The signal inputs of keys 5 and 1 are supplied with voltage from the output of detector 3, the signal inputs of keys 7 and 9 are zero voltage levels, and (the input of detector 3 is voltage from thermistor 19. The outputs of keys 4, 6, 8 and Yu are connected to the first input of the pulse driver 12, and the outputs of the keys 5,7,9 and 11 - to the second input of the driver 12. The control unit 13 pairs the keys 4 and 5, 6 and 7, 8 and 9, 10 and 11.

A sinusoidal voltage U is fed to the input of detector 3, and a constant voltage Up is present at the output, shifted by the value of voltage V. The voltage U is chosen so that under normal conditions

the voltage at the output of the detector 3 is zero

When the temperature of the phase shifter 2 changes, the voltage on the thermistor 19 starts to change. At the output of the detector 3, a voltage appears

h K,

where K is the transfer coefficient

detector 3;

RujpM is the magnitude of the temperature, change in voltage on the thermistor 19.

As a result, when the phase shifter 2 is under normal conditions, the voltages applied to the first input of the imaging unit 12 via keys 4, 6, 8 and 10 are compared with zero voltage levels supplied through the keys 5, 7, 9 and 11 on the second input of the shaper 12. With a change in the temperature of the phase shifter 2, the voltages supplied to the first input of the shaper 12 through keys 4 and 10 are compared with the output voltage of the detector 3, and the voltages supplied through keys 6 and 8 are with a zero voltage level.

When comparing the voltage of the phase shifter 2 with the voltage varying with the temperature in the shaper 12, the moments of pulse formation also vary in proportion to the temperature.

Thus, the output code is corrected when the temperature of the phase shifter 2 changes.

When forming the angle of rotation of the shaft into the digital code, the proposed device significantly reduces the error caused by the phase error of the phase 2 (body 2), which, together with increasing the accuracy of the converter, reduces the requirements for the temperature stability of the parameters of the phase shifter 2. This makes it possible to use contactless contactless converters rotary transformers with a higher temperature error

Claims (1)

Invention Formula The converter of an angle of rotation of a shaft in a code on an auth.St. № 922853, about tl h and y u and with the fact that, with the aim 51499497 increase the accuracy of the converter, the input of the pulse former, the first and second ter-out of the phase shifter through the first are entered into it elements of sensitivity, amplitude-sensitive element and through A ny detector and key switch, a control amplitude detector is connected to the area of the first, second, third bus and signal inputs of the fifth and fourth keys and the eighth keys, the second output respectively, with the control input-phase shifter through the second thermo- The fifth, sixth, seventh, and eighth element, and the signal keys, the outputs of which the combined inputs of the sixth and seventh keys are not connected and connected to an additional one directly connected to the common one,