SU1658350A1

SU1658350A1 - Electric drive

Info

Publication number: SU1658350A1
Application number: SU884609628A
Authority: SU
Inventors: Александр Григорьевич Иванов; Владимир Васильевич Михайлов; Алексей Сергеевич Чернышев
Original assignee: Всесоюзный Научно-Исследовательский, Проектно-Конструкторский И Технологический Институт Релестроения
Priority date: 1988-11-28
Filing date: 1988-11-28
Publication date: 1991-06-23

Abstract

Изобретение относитс к электротехнике и может быть использовано в автоматизированных электроприводах с вентильными преобразовател ми посто нного и переменного тока, например в электроприводах металлорежущего станков . Цель изобретени - повышение надежности электропривода. В системе управлени электроприводом компаратор 9 выполнен с переменным порогом срабатывани . Порог срабатывани измен етс в функции скорости электродвигател (сигнал оттахогенератора 4 через согласующий элемент 6 и выпр митель 11) и в функции тока. Элемент 12 задержки выполнен с измен емой в функции скорости выдержкой времени. Изобретение позвол ет также повысить быстродействие электропривода. 2 з.п. ф-лы, 2 ил. ЁThe invention relates to electrical engineering and can be used in automated electric drives with DC and AC converters, for example, electric drives of cutting machines. The purpose of the invention is to increase the reliability of the drive. In the motor control system, the comparator 9 is configured with a variable response threshold. The trigger threshold varies as a function of the motor speed (signal of the standstill generator 4 via matching element 6 and rectifier 11) and as a function of current. The delay element 12 is made with a time delay variable as a function of speed. The invention also makes it possible to increase the speed of the electric drive. 2 hp f-ly, 2 ill. Yo

Description

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Claims

Claim

1. An electric drive comprising an electric motor connected to a converter with a control system, to the inputs of which are connected a speed controller mounted on the motor shaft, a tachogenerator and a current sensor, serially connected matching element, amplifier and rectifier, the first of which is connected to the output of the tachogenerator by its input, the second is to the output of the speed adjuster, and the output of the rectifier is to the input of the comparator, the comparator and the actuator are connected in series, characterized in that. in order to increase reliability, a second rectifier is introduced into it, the input of which is connected to the output of the matching element, and the output to one of the inputs of the comparator.

2. The drive according to claim 1, with the fact that, in order to improve performance, it is equipped with a delay element, which is made in the form of a timer with a variable time delay and is connected between the output of the comparator and the input of the executive body , and its control input is connected to the output of the second rectifier.

3. The drive according to paragraphs. 1 and 2, characterized in that a resistor, a controlled key and an amplifier are introduced into it, while the output of the current sensor is additionally connected to one of the inputs of the comparator, the other input of which is connected to a common point of the key and the resistor connected by the second output to the output of the amplifier. the input of which is connected to the output of the second rectifier, and the control input of the key is connected to the executive body.