SU1635243A1 - Rectifier drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in control systems with a wide range of rotational speeds. The aim of the invention is to increase reliability and reduce weight and size indicators. To achieve this goal, the valve actuator additionally contains four aperiodic tweens 15–18, units 19, 20 of measuring veils, calculator 21, digital-analogue functional converters 2, 23, 24 tangent, sine and cosine, respectively. The voltage from the sine and cosine windings of the rotor squeeze sensor arrives at block 19 through aperiodic links 17, 18 and at block 20 Heir, is self-dependent. The measured veils are compared in calculator 21. The result obtained contains information about the rotor speed. The signal from the output of calculator 21 passes through a functional converter 22 multiplied by the sine and cosine in multipliers 13, 14 and is used as a correction in the main channel of current formation in a two-phase synchronous machine 1. 2 Il. SS (L

Description

The invention relates to electrical engineering, in particular to electric drives, and can be used in automatic control systems and mechanisms with a wide range of rotational frequencies.

The aim of the invention is to increase the reliability and reduce the mass and dimensions of the valve drive

FIG. 1 shows a functional diagram of a valve electric drive; FIG. 2 - functional scheme of the calculator.

The valve actuator contains a two-phase synchronous machine 1, mechanically connected with the rotor position sensor 2, made in the form of a rotating transformer r sine-3 and cosine 4 windings. The sinus winding 3 is connected to the sinus core winding 5 of the synchronous machine 1 circuit by successively connecting the first variable-sensitivity rectifier b and the first summing amplifier 7 "Cosine winding 4 of the rotating transformer. connected to the cosine crust winding 8 of the synchronous machine 1 through a sequentially connected second phase-sensitive rectifier 9 and a second summing amplifier 10. The valve actuator also contains an input source 11 connected to the winding 12 of the rotor position sensor 2, the first and second 14 multipliers, the first which inputs are combined. The actuator additionally contains four aperiodic links 15-18, first 19 and second 20 phase measurement units, calculator 21, digital-to-analog functional converter 22 Tangent, digital-to-analog functional converter 23 Sine, digital-to-analog functional converter 24 Cosine, Each block 19, 20 of phase measurement is performed in the form of serially connected divider 25 voltage, analog-digital converter 26 and digital functional converter 27 Arctangent The first and second inputs of the divider 25 for example They represent the first and second inputs of the phase measurement unit 19 (20), and the output of the digital functional converter 27 Arctangent is the output of the phase measurement unit 19 (20). Digital-analogue functional converters 22, 23, 24 of trigonometric functions are each made in the form of serially-connected digital functional converter 28 (29, 30) of the corresponding function and digital-analog converter 31 "

The first inputs of the multipliers 13, 14 are connected to the output of the digital-to-analog converter 22 Tangent, the second inputs of the first 13 and second 14 multipliers are connected respectively to the output of the digital-to-analog functional converter 23 Sine and the output of the digital-analog functional converter 24 Cosine. The outputs of the first 13 and second 14 multipliers are connected respectively via the first 15 and second 16 aperiodic link to the second inputs of the first 7 and second 10 summing amplifiers, respectively. The first and second inputs of the phase measurement units 19, 22 are connected respectively to the sinus 3 and cosine windings of the rotating transformer, and the inputs of the second phase measurement unit 20 are not connected

mediocre, and the inputs of the first block 19 through the first 17 and fourth 18 aperiodic link, respectively. The output of the first phase measurement unit 19 is connected to the first input of the calculator 21, the output of which is connected to the input of the digital-analog functional converter 22 Tangent The output of the second phase measurement unit 20 is connected to the second input of the calculator 21 and the inputs of the digital-analog functional converters Sine 23 and Cosine 24.

The calculator 21 implements the function Y Y4-Y, with y, O, Ug 0, y, “: O, y, 0, and y 7G- (y-y,) LY y 0, Y2 0; Gle y, yt - codes of numbers

0

five

0

five

0

five

0

on p

the first and second inputs 21 respectively, to

calculate 3.14.

The calculator 21 is made, for example, in the form of the first 32 and second 33 adders (FIG. 2), switch 34, HE 35 and AND 36 logic elements, with the first input of the first adder 32 connected to the output of the second phase measurement unit 20, and its second input - to the output of the first phase measurement unit 19, the code of number II is supplied to the first input of the second adder 33, and its second input is connected to the output of the first adder 32, the outputs of the first 32 and second 33 adders are connected respectively to the first and second inputs of the switch 34, controlling whose entrance is connected to the output l And 36, the first input of which is connected with the higher output of the second phase measurement unit 20, and the second input through the NOT 35 logic element with the higher output of the first phase measurement unit 19, the output of the switch 34 is connected to the input of the D / A function converter 22 Tangent

The valve actuator operates as follows.

The excitation winding 12 of the rotor position sensor 2 comes from an input source 11 of an alternating voltage.

, sin (2 / nf0t), (1)

Vuv

where u

- control voltage amplitude,

a is the modulation reference frequency. At the outputs of the sinus 3 and cosine 4 windings of the sensor 2 position rotjm fi

tori arise variable stress

U

TO,. U. sin2nf Ot. sin (mCOt) Ki uym sin2iife t.cos (mOX)

: OS - rotor angle of the synchronous machine 1, the transformation ratio of a rotating transformer,

the number of pairs of poles of the synchronous machine 1 and sensor 2 on the rotor shaft, -

CO is the rotation frequency of the synchronous machine 1.

Having passed through the first 6 and second 9 apochuclear rectifiers, these units are converted to voltages 20 and U

U4 de (0 t

TO

m

J7

u “and,

de kg

and u

to to

TO

UM -sin (mG) t-tf),

(3)

f

T lg utjrr

, Cg U cosCmWt-lf)

- transfer coefficient of phase-out straightener,

"Avctf mCi}, - the phase shift between the output and input voltages of a phase-sensitive rectifier, is constant over the time of the phase-sensitive detector,

25

thirty

IS

- K Kv U4m-sin27f0t- sinCmut -ft), ft

 To .. Ki-u .... .t-T ITSS: -Г15T - | i), (5)

Kr K

  sinZ nf 0 t cos (mft) t

- (

1635243

At the summing inputs of the first 7 and second 10 summing amplifiers, the feedback voltages of the frequency of rotation U, 5 and 1 are subtracted from these voltages.

Consider the process of forming these stresses.

The first and second inputs of the first meter 19 phase receive voltage U47 and taken from the outputs of the third 17 and fourth 18 aperiodic links:

un

K, Kj U.

U18 K1

g- sin (m (0t K

(

U.sin27f0t

cos (m "t -J3)

where K s is the transfer coefficient of the third 17 and fourth 18 aperiodic links, f} arctpmWTj is the phase shift between the output and input voltage of the third 17 and fourth 18 aperiodic links,

Tj is the time constant of the third 17 and fourth 18 aperiodic links. Using a voltage divider 25, the ratio of these voltages is determined

-ft)

G15T

- (

These voltages are converted by analog-digital converter 26 into a digital code, which is then fed to the input of a digital functional converter 25 Arctangent, which realizes the Arctangent function. The code of the number y (at the output of the digital functional converter 27, the Arctangent of block 19 characterizes the phase of the voltages U, g, and U, 8;

y, arctg tg (m (0t - ()

Go to "U9mtsin2 / iTfot- sitvmQt

.

cosraCOt

The voltage ratio (7) is converted by analog-to-digital converter 26 into a digital code, which by means of digital functional converter 27 is Arctanmolt

- /

(6)

where y is the code of the number at the output of the digital functional converter Arctangent 27 of block 19.

The first and second inputs of the second phase meter 20 receive, respectively, voltages 1C and U. Using the divider 25 voltages, their ratio is calculated, which is equal to

sitvmQt

cosraCOt

tgmCOt (7)

Gens,

realizes the function of the arctangent, is converted into a code of the number y, the value of which characterizes the phase of the voltage U

arctg (tgm (0t) raCOt,

(eight)

 2

yrt is the code of the number on the output of the digital functional converter 27 Arctangent of block 20.

Y a - Y,

 (five

at y, o, y2 0

Y, - 0, y 0 (9)

- (UY,) with y,: 0, ug Ј O

 Y, 0, u

The highest bit (cf) of the codes of the numbers Y and y carries information about their sign, and the presence of the number 1 in the highest bit of the number corresponds to its positive value, and the presence of the number O to its negative value.

V cases, if y 0, Y,: O, yi 0 and y., 0, Ucc O (Lig. 2), the signal O is removed from the output of the AND 36 logical element and switch 34 is in such a state that its output connected to the first entrance. Thus, the code of the number calculated by the first adder 32 is removed from the output of the switch 34.

If y, 0, and yr 0, then the output of the logic element 36 produces a signal 1 and the switch 34 is switched to such a state that its output is connected to the second input. Consequently, the code from the switch 34 will be removed by the code calculated by the second adder 33. As follows from expression (4), to obtain a signal proportional to the speed of rotation of the engine, you must calculate the tangent of expression (9). This calculation performs a digital-analog functional converter 22 Tangent by successively converting the code of the number y into a cop t p, y using the digital functional converter 28 Tangent and then to a constant voltage with the help of a digital-analog converter 31.

IgG K4. tgP K4 tg (arctgmOT3)

Ks -q

(ten)

4 - the transfer ratio of the digital-analog converter 31-,

K is the transfer coefficient of a pnfrop of a maternity func tional.1. The calculator 21 forms a cpl-y connected with cnggch 4 and u2 codes, which are connected to its inputs from the first 19 and second 20 measuring phases according to the following algorithm:

22 transformer Tangent. Thus, the first 19 and second

20 phase measurement units, calculator

21and an analogue converter

22 is an electronic tachometer. To form a harmonic

The signal, whose amplitude is proportional to the rotor frequency of the synchronous machine 1, uses the first 13 and second 14 multipliers, the first inputs of which are supplied with voltage i2g and to the second ones the corresponding harmonic voltages U2j and U24, formed by the digital-analog functional converters 23 Sine and 24 Cosine by converting the code of the number y. to sin y2 using a sine digital function converter 29; and to cos v z using a digital cosine ibyii-30 converter 30, which are then converted accordingly to voltages

40

With the power of 3 analog converter converters 1:

 Kg siny i0

 K ,, cozy

(ABOUT

Kg-sinmffltj (11)

K, cosmQt

about 7

where Ky is the transfer coefficient of the digital-analog functional converters 23, 24. Harmonic voltages are formed at the outputs of the first 13 and second 14 multipliers:

K-isInmcJt;

U13 K7 U22%

W

t (12) Uu K1 U22.U24 Kj.-K6.K7.

where K., is the transfer coefficient of the multipliers 15 and 16. Pass through the first 15 and second 16 aperiodic links, voltages (1}) mr-mFrachukpn and p.

t t Kg. K, -Kb-K7. “Sin (-4)

 K.S-sindnCOt -V);

(13)

  Ky K7 (m (Ol - (| i) K, CO-cosCmOL -1 |),

where K ,, is the coefficient of mercury of the first 15 and t opoi of April 16 of ages,

, K, „. (I6-C5, - Cg-P 4in (r-Wt -tf) - K, -W-sin (m (jt-C),

to K, 0. (Uq-U, 6) К,.,, 2.Uym.cos (m (Ot -If) - К0., 0 cos (md4 - (,,

ne k

0

Jq I6 | 0 0 L 2 т t is the transmission coefficient perk “–– o k„;

first 9 and second 10 amplifiers. If denoted by

TO

- K,

 5 p about 42 1 id urlneni And 4) take the form

И7 К (, и „т. Sin (m (Jt -If) - К, 2 СО sin (mfOt - (|), о

U, 0 К „. Uym. sin (; n (0t -if) - K | irCO cos (nui) t -f),

PK of the normal operation of the electric drive circuit

If - C (17)

those. phase shift (f, introduced by the first 7 and second 8 sensitive receivers, must be equal to the phase shift (introduced by the first and second aperiodic links.

When condition (17) is fulfilled, equation (16) is

and (K ,, - Uum- K ((2.CO) -sin (-C) U) 0 (K (| -U, jm- K12.U) -cos (mUt -tf),

(18)

In accordance with the principle of operation of the electric motor 1, these stresses form a rotating magnetic field in the bore of its stator, which creates a motor torque that drives the rotor of the synchronous machine 1 at a frequency proportional to the voltage amplitude and U) e

Consequently

(0 Kdv (K14 -CO), (19)

where Kie is the coefficient defined by. design parameters of the synchronous machine 1.

6, iI

Cj - ar g t c, r (i) Tg - gdvng in f m 1 between the input voltage and the internal voltage of the first and 15, and the second 16 aperiodic

links

Г Ј - constant time of the first 15 and second 16 aperiodic links,

10 o K, - Kg-Ky. Кь - the total ratio of amplification 11 .1 outputs of the first 9 and second 10 summing amplifiers

nlir zhrnich IS

(14)

 to";

A5)

TO

- K,

 5 p about 42 1 id urlneni And 4) take the form

(sixteen)

Sh

Reshil. (19) relative to speed, we get

- J1A6. , (20) 1 + KA6. TO,"

Гглн coefficient Кд6 К12 to choose in such a way that non-equal

K, K ,, 1,

two «1

then equation (20) transforms into Equation

(3D

- U4n,

TO

K U, m,

(22)

(2

Where

45

TO

(2

Thus, the valve actuator maintains the engine rotation frequency proportional to the amplitude-voltage of the control signal when the condition (17) is met. The adjustment characteristic of the electric drive, as follows from equation (22), is linear. The use of the electronic tachometer in the electric drive circuit makes it possible to measure the rotational speed without using an additional measuring electric machine, the weight and dimensions of which are much higher than the weight and dimensions of the electronic nodes, and reliability lower. The invention makes it possible to increase the reliability of the electric drive and reduce its overall dimensions.

Claims (1)

Invention Formula A valve actuator containing a two-phase synchronous machine, mechanically connected with a rotor position sensor, made in the form of a rotating transformer, the sinus winding of which is connected to the sinus core winding of the synchronous machine through the series-connected first phase-sensitive rectifier and the first summing amplifier, and the cosine winding connected to the cosine core winding of a synchronous machine through a series-connected second phase-sensitive rectifier and a second summing wuxi Intel, an input source connected to the excitation winding of a rotating transformer, the first and second multipliers, the first inputs of which are combined, characterized in that, in order to increase the reliability of the electric drive and reduce the weight and size parameters, four aperiodic links are added to it, the first and second blocks phase measurement, calculator, digital-analog functional converter Tangent, digital-analogue functional converter Sine, digital-analogue functional converter atel Cosine, each phase measurement unit is designed as a series-connected voltage divider, analog-to-digital converter and five 0 the digital functional converter Arctangent, the first and second inputs of the voltage divider form the first and second inputs of the phase measurement unit, and the output of the digital functional converter Arctangent is the output of the phase measurement unit, the first inputs of the multipliers are connected to the output of the analogue functional Tangent converter, the second outputs of the first and second multipliers connected respectively to the output of the digital-analog functional sinus transducer and the output of the digital-analog functional transform Cosine, the outputs of the first and second multipliers are connected through the first and second aperiodic links to the second inputs of the first and second summing amplifiers, respectively, the first and second inputs of the phase measurement units are connected respectively to the sinus and cosine windings of the rotating transformer, and the inputs of the second phase measurement unit directly connected, and the inputs of the first block through the third and fourth aperiodic link, respectively, the output of the first phase measurement block is connected to the first input a calculator whose output is connected to the input of the digital-to-analog functional converter Tangent, and the output of the second phase measurement unit is connected to the second input of the calculator and the inputs of digital-analogue sinus and cosine converters, and the calculator implements the function y (with y 0, y, 0, y4oO , and Y ft - (y “-Yy), with Y 0, y2 O, 5 where yf and y are codes of numbers on the first and second inputs of the calculator, respectively, nd 3.14. five 0 five