SU1450062A1 - Electric drive with slave control of parameters - Google Patents

Abstract

The invention relates to electrical engineering and may find application in mechanisms operating under conditions of frequent acceleration and deceleration. The aim of the invention is to increase the speed with both changing and unchanged input signal in the absence of an integrating link in the speed controller. The device contains a block to 11 squaring, the input of which is connected to the output of the setpoint: 5 speed. The output of the block 11 is connected directly to the input of the divisible dividing unit 12 and through the disconnecting actuator circuit 15 to the input of the divider of dividing unit 12. The speed sensor 8 through the closing circuit 14 is connected to the input of the divider unit 12 division. In this device, the operation of the switching element 13 makes it possible to generate at the input of the speed controller 6 a driving signal that takes into account the mismatch between the set and the actual values of the motor speed of 1.2 Il. g (L with

Description

FSh.1

fO

15

20

 1450062

The invention relates to electrical engineering, and specifically to the field of control of electric drives with subordinate adjustment of parameters, and can be used in electric drives of mechanisms operating under conditions of frequent acceleration and deceleration, for example, in electric drives of plotters.

The purpose of the invention is to increase the response rate both with a changing and unchanged input signal in the absence of an integrating link in the speed controller.

FIG. 1 shows a functional diagram of the drive; figure 2 is a characteristic of the threshold element.

An electric drive (Fig. 1). A power engine motor 1 with two control windings 2 and 1, each of which is connected to the outputs of the width-to-them, ... pulse converter 4, the speed control unit 5 and the serially connected controller 6 are connected to the control circuit speeds and current regulator 7, the inputs of which are connected respectively to speed and current sensors 8 and 9, as well as the threshold element 10. In addition, the electric drive contains a construction block P - squared, block 12 division and a switching element 13 with closing 14 and disconnecting 15 performer In this case, the input of the squaring block 11 is connected to the output of the speed setting unit 5, and its output is connected directly to the input of the divisible dividing block 12 and, via the disconnecting actuator circuit of the switching element 13, to the input Soldering unit 12 division, also connected through the closing of the executive circuit 14 of the communi- cation of the element 13 with the output of the sensor 8 speed Tji, soy, through the threshold: element 10 also with the input of the switching element 13.

. The electric drive works as follows.

The reference signal at the input of the speed controller 6 of the electric motor and speed setpoint generator 5 is formed in accordance with the expression

Ug on qi not ra

on water between the 25, 25

thirty

35

Where

At the time when the tantalizer was electrified with power and power, the input of the division was 5 waged by the NIN vite 50 ale out of the workplace 1 chain of the body portion of the electric

ch j co, -. r t

5 with

.C.0j

with,

 s u

setpoint angular velocity of the motor

fO

five

0

at the output of the setpoint speed;

U - the actual value of the yr-i lovogo speed of the motor at the output of the sensor 8 speed.

The multiplication of a given value of p, the ANGULAR speed of the electric motor by the ratio, is aimed at correcting the driver effect on the deviation of the controlled variable with at and deceleration of the electric drive.

Calculation in relative units shows that at the end of the acceleration of the drive at CO 1 and is 0.95, the difference between the set o and the actual values of the regulated value on the speed controller input, calculated by the formula, will be about l co. the same values of ω, ω, when a signal is sent from the speed setter directly to the control input, i.e. lo 0.05} di 2LSO.

thirty

35

where wi-so.

The same relation is maintained at the beginning of the drive deceleration at Q 0.95; with 1, as well as in the steady state with cai. 1 with 0.98, which leads to an increase in the speed of the drive control system in the absence of an integral link speed controller. The implementation of the above ratio is carried out using a squaring block 11 and a dividing block 12. To eliminate the division by zero, at the first moment of acceleration of the electric drive, the inputs of the divisible and divider units of the 12 division are signals of the same d5 value from the output of the 11 block squaring up to the square until the actual speed value. cD will not reach the value determined by the dead zone of threshold 0 element 10 (input characteristic - output threshold element in figure 2). The operation of the latter leads to triggering (mutated by its element 13), switching the executive circuits 14 and 15 and feeding to the input of the Afejm-bodies of the division block 12 a signal proportional to the angular velocity of the electric motor 1.

five

WITH

2

CO

Thus, the adjustment is made to the specified value of the angular velocity U of the electric motor, as a function of the actual value of the angular velocity СО CO by

CD,

multiplying CO- by a ratio greater than one during acceleration and in the steady state of the electric drive and less than one when coasting.

The output of the speed controller 6 forms a current setpoint applied to the first input of the current controller 7, to the second input of which a signal of the actual current value from the current sensor 9 is applied. The width-to-pulse converter 4 generates currents in the control windings 2 and 3, on which the magnitude of the speed of the motor 1 depends. The current setpoint if there is no integrator in the controller can also be adjusted using the additional squaring block, dividing unit, threshold element and the switching element is similar to how it is fulfilled for a given value of the speed of the electric motor.

The application of the invention leads to an increase in the productivity of the mechanism.

500624

Claims (1)

Invention Formula An electric drive with slave parameter control, containing a j electric motor with two control windings, each of which is connected to the outputs of a pulse-width converter, the control circuit of which includes a speed controller and a serially connected speed controller and current controller, inputs which are connected respectively to the speed and current sensors, as well as the threshold element, which is 15 so that, in order to improve speed, both with a variable and constant input signal in the case the absence of an integrating link in the speed controller, a squaring block, a dividing block and a switching element with closing and opening are entered into it: an executive circuit, the input of the 25 squaring block is connected to the output of the speed limiter, and its output is connected directly to the input of the divisible division unit and through the disconnecting executive circuit of the switching element 30 - to the input of the divider of the division unit, also connected via the closing executive circuit of the switching element to the output A speed sensor connected via the threshold element 2g is also connected to the input of the switching element. -Ct About Fay. 2 from