SU1547070A2 - Code-to-shaft position converter - Google Patents

Abstract

The invention relates to automation and computing and can be used to communicate digital computing devices with analog actuators. In order to increase the accuracy of the conversion by reducing the effect of the quadrature component of the signal from the output of the SBCT to the converter containing the source 1 of the reference voltage, a sine-cosine rotating transformer 2, quad switch 3, motor 4 with a gearbox, amplifier 5, filter 6, analog the switch 7, the digital-to-analog converter 8, the comparator 16, the code storage register 17, the functional code converter 18, the code switch and the digital switch 19 codes, the adder 9, FCV 10, the filter 11, the comparators 12 and 15, the source 13 are entered bias voltage and the switch 14 pulses. The newly introduced elements provide a mode of operation of the converter in areas of small mismatch between the input code and the actual rotor position of the sine-cosine rotating transformer (CCTVT), while the analog switch is controlled from the summing signal of the output windings of the ACCRT, which made it possible to completely eliminate the conversion error caused by the presence of a quadrature component in the signals of the output windings of the SCRT. 2 Il.

Description

The invention relates to automation and computer technology and may be used to communicate digital computing devices with analog actuators.

The purpose of the invention is to increase the conversion accuracy by reducing the influence of the quadrature component of the signal from the output of the stator-JJIOTOK sinus-cosine rotary transformer.

 FIG. 1 shows the structure of the proposed converter; cha figs. 2 - diagrams explaining the principle of its operation.

The code converter to the angle of rotation of the shaft contains a source of 1 base voltage ™, sine-cosine. / (Rotating transformer (CCWT) 2, switch 3 quadrants., Motor 4 with a gearbox, amplifier 5, first low pass filter 6, analog switch 7, digital-to-analog converter (SSC1) 8, adder 9, phase-sensitive rectifier (AF) 10, Second low-pass filter 11, comparator 12, bias voltage source 13, pulse switch 14, comparators 15 and 16, register 17, block 8 of functional code-to-code conversion, and digital switch 19.

The Converter operates as follows.

Angle o (to which the rotor of the ACS 2 should be deployed is represented by 8 register 17 by code N, consisting of the code of the higher bits and the code of the least significant bits. At the first input of the switch 3 quadrants from the output of SCRT 2

the signal is Us in J., and the second input is Ucoso, where U Umsinwt is the output voltage of source 1.

From the output of the switch 3 quadrants, the output signals of the ACS 2, reduced to the first quadrant, are fed to the analog inputs of the analog switch 7.

To control the analog switch 7, one of the two formed square-wave signals of the reference voltage is used: the first is using a comparator 16 from the source of Topornous voltage, the second is using an adder 9 and a comparator 15, and the inputs of the adder 9 are connected to the output of the switch 3 quadrants.

The first of the formed square wave signals may have a phase shift with respect to the useful components of the stator windings signals of ACS 2, the second one does not have such a shift.

In the first quadrant, the voltage at the inputs of the switch 3 quadrants is reversed in phase, which is necessary because the output of the low-pass filter 6 should generate a signal proportional to the difference between the specified angle o and the angle of mismatch SCRT 2

In this connection, in order for the absolute value of the instantaneous values of the amplitudes of the output voltages of the switch of 3 quadrants to be added in absolute magnitude of the instantaneous values of the amplitudes of the output voltages in the first quadrant of the adder 9, the input voltages are subtracted at the input of the adder 9.

51

dependencies are shown

FIG. 2a, the operating voltages U1 and U2 at the output of the switch 3 quadrants from the mismatch angle of the SCPT reduced to the first quadrant; the dependences U3 of the sum of the effective voltages U1 and U on the mismatch angle of the SCWT, while the positive values of U7 and U2 correspond to the coincidence of their phases with the phase of the reference voltage, and negative values - to the reverse phase. The voltage from the output of the adder 9, demodulated by a phase-sensitive rectifier 10 and smoothed by the filter 11, coincides in shape with the shape of the voltage U, figure 2 c.

From FIG. 2c, it is clear that the phase of the signal at the output of the adder 9 coincides with the phase of the reference voltage at /,. of t

. “L.

 where -45

135. C signal

The output of the filter 11 is fed to the comparator 12, to the input of which the bias voltage is also applied (Fig. 2c) from the output of the bias voltage source 13. At the output of the comparator 12 a high potential is formed (fig.2g) in the range of 3 g about 4, narrowed by several degrees with respect to the interval di at t of due to the offset voltage from source 13. This is necessary because with /, d and d . i, the voltage at the output of the adder 9 and the pulses at the output of the comparator 15 will be absent.

Thus, at c s /, i.e. at high potential at the output of the comparator 12, the pulse switch 14 is in the initial position, in which it transmits to the control input of the analog switch 7 pulses from the output of the comparator 15, which are in phase with the phase logged components of stator windings of SCWT, providing suppression of quadrature components. At large misalignment angles at the output of the comparator 12 a low potential (Fig. 21). Switch 4, connected to the control input of the analog switch 7, transmits pulses from the output of the comparator 16, generated from the reference voltage. Since they are out of phase with respect to the useful component of the ACLT signals, complete quadrature will not be suppressed. However, this will not affect the accuracy of the conversion, since the component will be useful.

five

0

50

5 0 5

five

0

significantly more of the parasitic component and the latter will not be able to change the sign of the resulting voltage at the output of the filter 6.

Block 18 from the input code N of the register 1 7 generates the codes N., cos N and N2 sin N. In the first half-period of the reference voltage, the signals U Sin () and cos N arrive at the inputs of the DAL 8, and the signals t) in the second half-period. cos (ob-N) and sin N. DAL 8 operates in the multiplication mode of the input signals to the analog and digital inputs. At the output of the amplifier 5, the constant component of the difference in the output voltages of the DSL 8 in two half periods is proportional to sin (oi-N).

The output DC voltage of the filter 6 through the amplifier 5 acts on the engine 4, which deploys the rotor of the SSC 2 until the mismatch between eL and N is eliminated.

Thus, at small misalignment angles between and N, the control input of the FWC 10 receives a signal that coincides in frequency and phase with the useful component of the output signals of the SCRT, which provides suppression of the quadrature component and improves the accuracy of the conversion.

Claims (1)

Invention Formula The code converter to the angle of rotation of the shaft according to ed. St. No. 1363472, characterized in that, in order to increase the conversion accuracy, an adder, a phase-sensitive rectifier, a second and third comparators, a second low-pass filter, a bias voltage source, and between the output of the first comparator and control inputs are entered into it analog and digital switches included the first input and output pulse switch, the first and second outputs of the quad switch are connected respectively to the inverting and non-inverting inputs of the adder, the output of which is connected to the input of the second the comparator and one input of the phase-sensitive rectifier, the output of which through the second low-pass filter is connected to the first input of the third comparator, the output of which is connected to the control input of the pulse switch, the output of the first comparator is connected to another input of the phage-sensitive rectifier, the output of the second comparator is connected to with the second input of the pulse switch; the output of the bias voltage source is connected to the second input of the third comparator. I СЈз О I ц g Fig2 Editor A. Lezhnin Compiled by V. Fateev Tehred L. Serdyukova, Order 85 / Circulation 666 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Corrector in, Girn K Subscription