SU1654960A1 - Thyristor drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in following systems. The purpose of the invention is to simplify and reduce hardware costs. For this, the valve actuator additionally contains the first and second reference voltage formers, the first and second analog-discrete calculators, each of which includes a filter, a three-input accumulator and four sampling-storage devices. When the valve drive is operating, the computing devices 15, 16 form signals comprising positional and velocity components. Under the action of these signals, an electromagnetic moment develops in the synchronous machine 1, and the angle between the current and the magnetic flux of the rotor does not depend on the rotational speed of the electric motor, which allows to simplify the drive and reduce hardware costs, maintaining the optimum angle between the current and magnetic flux rotor synchronous machine. 3 il. (L

Description

  AND

19 V J. 9 Y 4. flJ1Г L

--- X, + ----- Хг + U JL 2К and sinm6J | t0 + (n - 1) TJ

-3 -) Xj, (9) determines the derivative of the input function at the points t- + (n-1) T.

where Y is the output voltage of the sum- 10 Therefore, at time points

the torus 18ЈtD + pT equation (13) characterizes the XY XE voltage on the first, the second value of the envelope and the derivative of the third third inputs of the summing input voltage at times

21 times t0 + (p-1) T and can be written in the form

Substituting the values of the input eg g

Genii, defined by the expressions (6) -HgLo pT KU sinmQ T6 + (n (8), in equation (9)), we find the expression fj c. KQU-T9mu) cosm (j3 Ft + (n is the voltage at the output of the three-input -t "3 adders 21 analog-to-discrete-20 °

numerator 15 at times t0 + Voltage + nT) arrives

+ nj. to input 25 of the sample-storage device, to the control input of which is

 + pT K | UjSinmU) | t0 + (at the time t0 + pT, an up1 2 G Td 25 leading pulse is received

-1) TJ + -y-K sinmCOCt ,, + pulses U, s, as a result of it

. , 2n - 1 tailout at times tQ + pt at bf pT) + 2TjK UjSininO (.t0 + T - is the voltage corresponding to

Ta G, I, the sum of the envelope and the derivative of Ogi-3-22-Y sinmtf to + 10 30b input voltage

Xl should be denoted according to + n KqU.sinulm t0 + (n (4) - 1) T +) costn (+ (n K .U, sinm (0 (t0 + -22 --- 1-T) - К Ux- FROM (15)

   35 The voltage from the output 25 of the Ksinmtoft .. + (n - 1) TJ sinm6) te + sampling-storage device is fed to

-. 1 / 41ch filter input 20 s transfer function + U - UTJ, UUц

where th is the operator of descending differences „

first bit for inter-)

forward, where R is the transfer coefficient K-U, sinm03 t0 + (n - From - 2KaUt filter;

A constant filter time.

Ksinmu) (t0 -f) + KftU. sinm6) (t, j + As a result, at the output of the analog ° discrete calculator, 15 forms + пТ) Д 2KaU, sinniCi) (to + (, (12) with an analog signal proportional to the sum of the envelope and derivative of

 - operator of the downstream bending input voltage, the second order for the inter & forward forward, 50

this expression (10) takes the form .. „Г„,

U4S - Ugo -; - J-p- {KflU.sinm W x

U,. (Tfl + nT) K.U, sinmOi) t + (n-9

2Ta + (n 1) TJ + K U T mWcosmCO X

-OT - - {u sinraW t0 + n - + (n - 1) TlJ. 3 (17)

-1) TJ - 2 u 2U, K.sinnO) tc + (n - Analog-discrete solver 16

j works the same way. Voltage

-OTJJ (13) his exit inventory; art equation

U16

- -p-fy; cosmco t0 +

+ (n - 1) t - K.U (+ (n - -. (18)

The voltages U and U, g, respectively, arrive through amplifiers 6 and 7 with the transfer function

Vp)

(nineteen)

Kju

1 + T P

1 V

where Kms, T s - respectively, the gear ratio and the time constant of the amplifier,

on the sinus 8 and the cosine 9, the crust windings of the synchronous machine 1 cause the currents described by the expressions

18 WucWO, Q {KC, U sinraO) t0 + (n - 0ETZ-idu-I

-1) TJ + K, U, T3 macosnCO t0 + (n-l) Tjj-W KpQsinnult; (20)

R

19 W W UgjKgU cosmtofte + (n -I) T + .T, masinmCo t0 + (n-1) TJj-WqKpCOcosmtn:, (21)

0

where Kg is the coefficient determined by the design of the synchronous machine 1;

TO

i - W-Gsosi + (mu) T9) 2

U -t ---- - transfer function by

 current of the synchronous machine T, - (A) - T.rtOsin (m (j) t - Ы.) 1 - T. - electromagnetic constant n-eJ

at the time the root winding is KKgCOcosnQt;

synchronous machine ki;

one

K - - transfer coefficient

I am the current of the synchronous machine R ,. - active resistance

Root winding synchronously machine.

In equations (20) and (21), the product of transfer functions can be represented, if we neglect the derivatives of the second and highest order, in the form of the equivalent transfer function

Ke

W9 1 - t p

(22)

Kd K -Kf K - equivalent transfer coefficient of the phase core,

+ Tj, is equivalent to the time constant of the core phase.

+ T

H

0

For normal operation of the valve motor, the equivalent time constant T5 is selected based on the condition of the continuous nature of the current change in the core windings 8 and 9 of the synchronous machine 1, as a result of which T5 TD. Therefore, when calculating the component of the current, due to the EMF of the root winding of a synchronous machine, we neglect the electromagnetic time constant T.

Consequently, the equations (20) and (21) currents in the core windings 8 and 9, taking into account the amplitude-frequency

A (CO)

Ke

-Jl + (t () 2

and phase

(i) (CO) -arctg tsoTe

(23)

(24)

The characteristics of the equivalent link are written as the following continuous functions:

iR --JSaSag - -ГГз1п (t - 5 -Ji + (ш№э) г L

- Ф,) + Т mOcosdnCut - (| () - JCKf CO

to s inmCOt;

(25)

i - Ш-Гсози - + (mu) T9) 2

 ) - T.rtOsin (m (j) t - Ы.) 1 - eJ

 ) - T.rtOsin (m (j) t - Ы.) 1 eJ

KgCOcosnQt;

f, arctg mfflT9

The value determines the phase shift between the voltage envelope at the output of the sinus 4 (cosine 5) sensor 2 windings in position and the current in the sinus 8 (cosine 9) core winding of the synchronous machine 1.

Expressions in square brackets of equations (25) and (26) are the algebraic sum of two harmonic quantities and, in accordance with the summation rules, can be represented as

sindnQt - f,) + T3mCOcos (mQt - C) -f + (mT9cO) 2sin (n (Ot - f, + + VU); (28)

cos (m (0t - (},) + T3mCOsin (m (i) t 25

C) l | 1 + (mT90)) 2cos (mCOt - F, + F2); (29)

y2 arctg tyte. (30) 5 From expressions (27) and (30) follows

L Fa, (3D

Substituting (28) and (29) respectively | Q is true in (25) and (26) taking into account (31), the

i8 KgKaUisinmQt-KKptosinmbJt,) i K9KQU "cosm (Ot-KKFu3cosm (jJt. (33) {5

In accordance with the principle of action of the valve drive, the currents ig, io, roteka in sine 8 and cosine windings form a rotating 20 fertile field in the bore of the stator of the synchronous machine 1, which, interacting with the magnetic field of the stator, creates a rotating moment defined by the expression

M KMigsimnfift + KMi cosra6Jt, (34)

where Kw is the coefficient defined by the design of the synchronous machine 1. Substitute (32) and (33) into (34), a-30

ray

M - KM (K, KjU - KKf (0). (35)

Equation (35) is an equation for the mechanical characteristic of a fan-35 leg of an electric drive.

An analysis of equation (35) shows that the mechanical characteristic of a valve electric drive is linear throughout the entire range of speed variations, and 40 the moment developed by it is proportional to the voltage U of the task.

Analysis of equations (32), (33) and (2), (3) shows that the phase shift between the envelopes of the voltage at the output of the sine and cosine windings is the position sensor and current in the sine and cosine core windings of the synchronous machine, respectively zero Therefore, the angle between the current isd

the magnetic flux of the rotor is ft / 2 and does not depend on the frequency of rotation of the rotor.

Thus, the introduction of two reference voltage formers and two analog-digital calculators into the valve electric drive makes it possible to significantly simplify its linearity scheme

55

five

five

Q

five

0

thirty

35

40

45 pr

as the introduction of these elements in the proposed connections allows the angle between the current and magnetic flux of the synchronous machine rotor to be optimal by the maximum moment condition, equal to p / 2 throughout the entire range of rotor speed variations.

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 with excitation winding, sine and cosine windings, first and second amplifiers, the outputs of which are connected respectively to the sinus and cosine core windings of a synchronous machine, input source a signal including a reference voltage generator and a modulator, the modulator reference input being connected to the output of the reference voltage generator, and the modulator output The output of the input source and connected to the excitation winding of the rotor position sensor, characterized in that, in order to simplify and reduce hardware costs, the first and second reference voltage drivers, the first and second analog-discrete calculators with analog and first and second control inputs, each of the analog-discrete calculators is connected: to the sinus and cosine windings of the rotor position sensor, respectively, the same-name control inputs of the analog-discrete calculators are combined The first combined control inputs are connected to the output of the first reference voltage driver, and the second combined control inputs are connected to the output of the second reference voltage driver, the outputs of the first and second analog-discrete calculators are connected respectively to the inputs of the first and second amplifiers, each the analog-discrete calculator is equipped with a filter, a three-phase adder that implements the function Y.-- | S-X, 3 Ј 1-L Y - t me, iDx < + > (1 and four sampling storage devices, wherein the analog inputs of the first and second sampling storage devices are combined to form the significant input of the analog-discrete calculator, the control inputs of the first and fourth sampling storage devices are combined and form the first control The control inputs of the second and third sampling storage devices are combined and form the second control input of the analog-discrete calculator, the output of the first sampling storage device is connected to the analog input of the third The output adder, the outputs of the second and third sampling storage devices are connected to the second and third inputs of the three-input adder, respectively, the output of the adder is connected to the analog input of the fourth sampling storage device, the output of which is connected to the filter input, and the output of the filter forms the output of the analog-discrete calculator, the inputs of the first and second reference voltage formers are connected to the output of the reference voltage generator, where X, X, X3, Y are the voltages on the first, second, third inputs and output of the total and accordingly, T - a period reference voltage, Te - equivalent electromagnetic time constant of the phase windings of the synchronous machine anchor. Mffl / cP  G P JJfi.tlcP $ y "4 e) and UcP l  -Uefl / P 18Oed. gflaff. ЈU YU FIG. 2  Uj fvimbi (t0 + tt) FshE Uc /