SU1228207A1 - Electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives for stabilizing the core current of an electric motor of direct current. The purpose of the invention is to improve accuracy. The electric drive contains an electric motor 1, the root winding of which is connected to the amplifier 2, a task unit 3 connected to the input of the amplifier 2 through a series-connected adder 4, the PID controller 6, the multiplication unit (WU) 8 and the adder 5. The current sensor 7 is switched on between the electric motor 1 and the adder 4 ,, Summing amplifier (SU) 9 output connected to the adder 5. The first input SU9 soi (L

Description

dinene with current excitation sensor 10 and with first input BU 11j The second input of SU9 is connected to sensor 10 through series-connected BU11 and a dividing unit (DB) 12. The third input of SU9 is connected to speed sensor 13 via series-connected BU 14, 15. Second the input of the DB, 12 directly and the second input of the control unit 14 are connected via a nonlinear link 16 with a relay characteristic to the speed sensor 13 and to the first input of the database 17. Second. input DB 17

The invention relates to electrical engineering and can be used in devices for stabilizing the current of a DC electric motor, a current.

The aim of the invention is to improve the accuracy.

The drawing shows a diagram of the drive.

The electric drive comprises an electric motor 1, the root winding of which is connected to the amplifier 2, a unit 3 tasks, the output of which is connected through series-connected adders 4, 5 and the PID controller 6 with the input of amplifier 2, a current sensor 7 connected to the input of the adder 4, the first multiplication unit 8 is connected between the output of the PID controller 6 and the first input of the second adder 5, the second input of which is connected to the output of summing amplifier 9, the first input of which is connected to the excitation current sensor 10 directly and to the first input of the second intelligent block 11 When the second input of the summing amplifier 9 is connected to the sensor 10 of the excitation current through the serially connected second multiplication unit 11 and the first division unit 12, and the third input is connected to the speed sensor 13 through the serially connected third and fourth multipliers 14 and 15, the inputs of the first division unit 12 and the third multiplication unit 14 (the first is directly, and the second is via a non-linear link 16 with a relay characteristic)

connected to a constant voltage source 18, DB 17 is connected to the second input of the control unit 8. Introduction of a constant voltage source, summation amplifier, two division blocks j, four multiplications blocks and a nonlinear link, the controller in the form of a PID a current regulator and the indicated connection of these elements make it possible to increase the accuracy of maintaining the limiting values of the current of the electric motor. 1 il.

with the speed sensor 13 and with the first input of the second dividing unit 17, the second input of the second dividing unit 17 is connected to a constant source 18. voltage, and the output of the second block 17 of the division is connected to the second input of the first block of multiplication 8.

The drive works as follows.

The input of the adder 4 from the block 3 of the task receives the signal of the set value of the current core "of the electric motor 1, which is compared with the current value arriving at

its other input is from current sensor 7.

The output error signal is converted by the PED controller 6 and is fed to the input of the first multiplication unit 8. At the same time

Using the second division unit 17, a variable coefficient k (x) is determined, which is fed to the second input of multiplication unit 8. The second input of the adder 5 enters the second

the control voltage component is a variable offset 0 (x) determined by the calculator 19. The calculation of the specified components is performed as follows:

U k (x.W ((

k (x (

. GO

Cm-b 1b

Uc () 8, - + BjiaA 8, Q.; G, (0;

; U.-F

Lr

gk-ed

B, I,

AT,

de B,, B, Ve and constant coefficients;

constant voltage; motor excitation current; motor speed;

electric motor constant; mechanical constancy of the electric motor; K hell - the steepness of the magnetization curve of the electric motor;

given current of electric motor; inductance and resistance of the motor core winding; the moment of inertia on the motor shaft; specific moment of viscous friction; transfer function of PVD current regulator; current error of the motor core.

The use of this device makes it possible to increase the accuracy of maintaining the limited values of the current of the electric motor core.

 VA

WITH,. U L .R About Yao

W (pl

A 1 Invention Formula

An electric drive containing a direct current motor, the root winding of which is connected to the force. body, task block, the output of which

Editor I.Rybchenko

Compiled by M.Kr Khtunova

Tehred N. Bonkalo Proofreader V. Sinitska

Order 2294/55 Circulation 631 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

12282074

connected via successively connected first and second adders and a current controller with an amplifier input, a current sensor core connected to the input of the first 5 adder, an excitation current sensor, and a speed sensor, characterized in that for the purpose of a high voltage summing amplifier, two dividing units, four multiplying units, a nonlinear link with a relay characteristic, and the current controller is made in the form of a PID current controller, with the first multiplication unit being connected between the output of the PID controller and the first input of the second adder, the secondthe stroke of which is connected to the output of the summing amplifier, the first input of which is connected to the sensor of the excitation current directly and to the first input of the second multiplication unit, the second input of which is connected to the output of the summing amplifier, the first input of which is connected to the sensor of the excitation current directly and to the first input of the second the multiplier unit, the second input of the summing amplifier is connected to the excitation current sensor through the second multiplier unit and the first division unit connected in series, and the third input is connected to the sensor com speeds through successively connected third and fourth multiplication units, the second inputs of the first division unit and the third multiplication unit (first directly, and the second through a nonlinear element with a relay characteristic) are connected to the speed sensor and the first input of the second division unit, the second the input of the second division unit is connected to a constant voltage source, and the output of the second division unit is connected to the second input of the first multiplication unit.

Claims (1)

Claim An electric drive containing a DC motor, the anchor winding of which is connected to a force. a body, a reference unit, the output of which is connected through series-connected first and second adders and a current regulator to the amplifier input, an armature current sensor connected to the input of the first adder, an excitation current sensor, and a speed sensor, characterized in that, in order to improve accuracy, a constant voltage source is introduced into it, a summing amplifier, two division blocks, four multiplication blocks, a nonlinear link with a relay characteristic, and the current regulator is made in the form of a PID current regulator, and the first multiplication block is connected between to the output of the PID controller and the first input of the second adder, the second input of which is connected to the output of the summing amplifier, the first input of which is connected to the excitation current sensor directly and to the first input of the second multiplication unit, the second input of which is connected to the output of the summing amplifier, the first input of which is connected with the excitation current sensor directly and with the first input of the second multiplication unit, the second input of the summing amplifier is connected to the excitation current sensor through a second block connected in series ok multiplication and the first division unit, and the third input is connected to the speed sensor through sequentially connected third and fourth multiplication units, the second inputs of the first division unit and the third multiplication unit (the first directly and the second through a nonlinear link with a relay characteristic) are connected with a speed sensor and with the first input of the second division block, the second input of the second division block is connected to a constant voltage source, and the output of the second division block is connected to the second input of the first multiplication block.