SU1413695A1 - Variable d.c. drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control DC motors. The aim of the invention is to improve the speed and improvement of energy performance. The device contains a corrective model 11, the output of which is connected to the input of the first comparison unit 3. The input of the corrective model 11 is connected to the input of the current regulator 6. The device allows the system to maintain a predetermined statistic by eliminating the dynamic error of the current loop. 1 il.

Description

GLGE

This invention relates to electrical engineering and can be used in direct current drives.

The aim of the invention is to improve speed and improve energy performance.

The drawing shows a diagram of the drive.

I The DC electric drive contains an electric motor 1 connected to the converter 2, the first unit 3 connected in series with the comparison, the rotation speed regulator 4, the second comparison unit 5 and the current regulator 6, the output of which is connected to the input of the converter 2, are connected in series The rotation sensor 7 and the filter 8, the output of which is connected to the input of the first comparison unit 3, are connected in series with the current sensor 9 and the amplifier 10, the output of which is connected to the input of the second comparison unit 5, corrected (and A spruce 1 1, the output of which is connected to the input of the first comparison block 3. The input of the correction model is connected to the output of the second comparison block 5, and the correction model 11 and the current controller are made with transfer functions

.TUL

Tg () (

Vr

(v, t ", k

-) de T, - thunder and

electromagnetic dated time; P is the Laplace operator;

T, y is small. And non-compensating time constant;

T (j is the filter time 45;

RQ is the active resistance of the core chain;

K „- transfer coefficient

converter; ate

K - current loop gain factor;

K - gain factor. contour frequency bpaifle. -ni; 55

C - constructive motor constant. The drive works the next braz.

j

YU - . 15 20 25 30

35

before

45

ate

55

The input signal is fed to the non-inverting input of the first comparison unit 3, from the output of which, through the series-connected speed controller 4, the second comparison unit 5, the current regulator 6 is fed to the power converter 2. The frequency of rotation of the electric motor 1 is controlled by varying the voltage of the power converter 2 by means of negative feedbacks on current and frequency of rotation, taken from current sensor 9 and tachogenerator 7 and fed through current amplifier 10 and filter 8 to control inputs tori 6 and 4 and the current rotational speed. The input signal of the current regulator 6 through the model I 1 of the correction model is fed to the input of the rotational speed controller 4, while (The total feedback signal at the input of the rotational speed controller 4 is equivalent to the signal reduced by the corrected dynamic error of the current loop. the transfer function of the closed-loop system has the form of the product of the aperiodic link to the closed transfer-function of the current loop.

Taking the gain of the regulator 3 rotational speed as possible, we obtain the dynamic parameters of the dual-circuit system of the subordinate control close to such a current loop.

Claims (1)

Invention Formula A controlled DC electric drive containing an electric motor connected to the converter, the first comparison unit connected in series, a rotational speed controller, the second comparison unit and the current controller whose output is connected to the converter input, the rotational speed sensor connected in series the filter, the output of which is connected to the input of the first comparison unit, the current sensor, the output of which is connected to the input of the second comparison unit, the correction model of the output of which is connected to the input of the first block In comparison, in order to improve performance and improve energy performance, the input of the orienting model is connected to the output the second comparison unit, the correction model and the current regulator having the following transfer functions: p1 and gr-) - 9 fj. w km K, CT «pU T (Vp + l) V (5-K; K; fe: (T.T.bi.ij.), Tdts, T "- electromechanical and electromagnetic time constant; P is the Laplace operator; T, is the constant of the current regulator time; : T is a small non-compensable time constant;  - constant high-pass filter time} R. is the total active resistance of the core chain; C — engine constant; К „is the gain coefficient of the power converter; K, - coefficient of current loop amplification; K is the loop gain.