SU1226668A1 - Method of converting shaft turn angle to digital value - Google Patents

Abstract

The invention relates to automation, relates to computer technology and can be used in information-measuring and control systems. The aim of the invention is to improve the accuracy and temperature stability of converting the angle of rotation of the shaft to a code. To do this, they form two signals of the first frequency and two signals of the second frequency, which are then summed in pairs with voltages containing the signals of the first and second frequencies, feed the stator windings of the sine-cosine sensor, and multiply the voltage of the rotor windings frequencies, which are compared to the reference, received by 4, signals of the first and second frequencies, and the phase difference is converted into a code. 1 il. go you about O5 Od 00

Description

The invention relates to automation, computing, and can be used in information-measuring and control systems. .

The purpose of the invention is to increase the accuracy and temperature stability of the conversion.

The drawing shows a functional diagram of a converter implementing the proposed method.

The converter contains setting generator 1, driver 2 of para-phase signals, adder 3, block 4 subtraction, sine-cosine sensor 5, multipliers 6 and 7, filters 8 and 9 of the difference frequency, converter 10 of phase shift into a code.

The Converter operates as follows.

The high frequency oscillations generated in the master oscillator 1 are used to produce a quad

frequency signals J, and co, this function is performed by shaper 2 paraphase signals. As a result, the following voltages are present at its outputs:

e E cos co, t;

 cosWjt;

 sina, t;

where E is the amplitude of the alternating voltage.

In adder 3, the voltages e. And eo are added, and in block 4 the subtracts g

voltage e and e4. Output voltages of the adder 3 and block 4

and, E (cos ω, t + cosa, t); U E (sin, t - sinco t)

used to power the sine-cosine sensor 5, the output voltage of which, taking into account its parameters and parameters of the communication line, will be as follows:

 K, cos (, t + q), - o (,) - t-E Kj cos (., +

, sin (w, t + q, -ab) + E.K2 sin (cOjt + q) ,, + where Kj, K ,,

transmission coefficients from the nous-cosine sensor 5, respectively, at the frequencies CO, W, 2, phase shifts, introduced directly by the sine-cosine sensor 5 and the communication line at the frequencies w,

After multiplying the signals U and Uy in multiplier 6 and extracting the difference frequency 5 using filter 8, it will have

, K2sin (nt-2oi + cp, -cpp

After multiplying the signals e and e in the multiplier 7 and extracting the difference frequency component at the output of the filter 9, we will have

and.

0.5 E

It is obvious that the output code proportional to the phase difference of the signals Ug and Ug, obtained in the converter 10 phase shift in the code, is equal to

20

25

thirty

35

;

.

40

45

50

55

N, -2 + tf1- P ..

As can be seen from the last expression, the output result of the transformation is affected only by the difference in the phase shifts introduced by the sensor 5 and the communication line, respectively, at the frequencies Q, and cOj, while in a known technical solution, the output result of the conversion includes shifts.

Claims (1)

Invention Formula A method of converting an angle of rotation of the shaft into a code based on the formation of the first and second signals of the first frequency, which are shifted relative to each other by 90, the formation of the third and fourth signals of the second frequency, which are shifted relative to each other by 90, forming the first supply voltage by adding the first and third signals, shaping the second supply voltage, converting the first and second supply voltages into the fifth and sixth signals, functionally dependent on the angular displacement, moduli the fifth signal, extracting from the modulated fifth signal an information signal whose frequency is equal to the first and second frequency difference, generating a reference signal whose frequency is equal to the first and second frequency, determining the phase difference between the information and reference signals, converting the phase difference between the information and reference signals in the output code, characterized in that, in order to improve the accuracy and temperature stability of the conversion, the second supply voltage is formed by subtracting etvertoRedaktor A.Sabo Compiled by A.Sydorenko Tehred V.Kadar Proofreader M.Sharoshi Order 2147/59 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries. 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, G.Uzhgorod, Projecto St., L 2266684 signal from the second signal, the modulation of the fifth signal is carried out by the sixth signal, and the shaper of the reference signal is performed by modulating the second signal with a third "