SU826540A1

SU826540A1 - Device for control of dc thyratron motor

Info

Publication number: SU826540A1
Application number: SU792806995A
Authority: SU
Inventors: Яков Наумович Дашевский; Леонид Зиновьевич Канторович
Original assignee: G Pi Elektrotyazhkhimproekt
Priority date: 1979-08-02
Filing date: 1979-08-02
Publication date: 1981-04-30

Description

II

Изобретение относитс к электротехнике и может быть использовано дл управлени вентильным электроприводом посто нного тока, работающим с технологическими остановками.The invention relates to electrical engineering and can be used to control a DC electric drive operating with process stops.

Наиболее близким к предлагаемому по технической сущиости вл етс устройство дл управлени вентильным электроприводом посто нного тока, содержащее вентильный преобразователь, нагруженный через выключатель на электродвигатель 1.Closest to that proposed by technical means is a device for controlling a DC electric drive containing a valve converter loaded through a switch on the electric motor 1.

Недостатками устройства вл ютс его низка экономичность из-за потерь энергии в трансформаторах (в реакторах), остающихс включенными при оперативных отключени х электропривода.The drawbacks of the device are its low efficiency due to the energy losses in the transformers (in the reactors), which remain switched on during the operative switch-off of the electric drive.

Цель изобретени - повышение надежности и экономичности электропривода.The purpose of the invention is to increase the reliability and efficiency of the electric drive.

Указанна цель достигаетс тем, что в устройство дл управлени вентильным электроприводом посто нного тока дополнительно введены контактор, подключенный по входу к питающей сети переменного тока и по выходу - к вентильному преобразователю , узел блокировки, выходы которого соединены с управл ющими входами выключател и контактора, а первые два входа соответственно с входом и выходом вентильного преобразовател , и командный блок, выходы которого соединены с третьими и четвертыми входами узла блокировки. В свою очередь узел блокировки содержит последовательно соединенные первый инвертор , первую цепь временной задержки, второй инвертор, первый элемент ИЛИ, первый элемент И,второй элемент ИЛИ, последовательно соединенные вторую цепь временной задержки, второй элемент И, элементThis goal is achieved by adding a contactor connected to the AC power supply network and to the valve converter, an interlock unit, the outputs of which are connected to the control inputs of the switch and the contactor, to the device for controlling the DC motor drive. the first two inputs, respectively, with the input and output of the valve converter, and the command block, the outputs of which are connected to the third and fourth inputs of the blocking node. In turn, the blocking node contains the first inverter connected in series, the first time delay circuit, the second inverter, the first OR element, the first AND element, the second OR element, the second time delay chain connected in series, the second AND element, the element

«Пам ть, первый и второй пороговые элементы , причем первый вход первого элемента .ИЛИ, вход первого инвертора и вход второй цег1и временной задержки соединены с третьим входом узла блокировки, инверсный вход первого элемента И- с выходом"The memory, the first and second threshold elements, the first input of the first element. OR, the input of the first inverter and the input of the second time delay circuit are connected to the third input of the blocking node, the inverse input of the first I element with the output

первого порогового элемента и инверсным входом второго элемента И, вход первого порогового элемента - со вторым входом узла блокировки, выход второго элемента ИЛИ - с первым выходом узла блокиthe first threshold element and the inverse input of the second element AND, the input of the first threshold element - with the second input of the blocking node, the output of the second element OR - with the first output of the node blocks

Claims

the second input of the second element OR with the output of the second threshold element whose input is connected to the first input of the blocking node, and the output and second input of the Memory element are connected respectively to the second output and the fourth input of the blocking node. The drawing shows a block diagram of a device for controlling a DC electric drive motor. The device contains a contactor 1 connected at the input with an AC mains supply, and at the output with a valve converter 2 loaded via a switch 3 to the electric motor 4, an interlock unit 5, whose outputs are connected to the control inputs of the contactor 1 and switch 3, and the first two inputs - respectively with the input and output of the valve Converter 2, and the command unit 6, the outputs of which are connected to the third and fourth inputs of the node 5 lock. Node 5 block consists of the first element OR 7, the first input of which is connected to the third input of the blocking node, the first inverter 8, the input of which is connected to the first input of the first element OR 7, the first circuit 9 of the time delay, the input of which is connected to the output of the first inverter 8, the second inverter 10, the input of which is connected to the input of the first circuit 9 of the time delay, and the output is connected to the second input of the first element OR 7, the first element AND 11, whose direct input is connected to the output of the first element OR 7, the first threshold element 12, the input of which is connected to the second input of the blocking unit 5, and the output to the inverse input of the first element 11 and the second element OR 13, the first input of which is connected to the output of the first element 11 and the output to the first output of the block 5, the second threshold element 14, the input of which is connected to the first input of the interlock 5, and the output to the second input of the second element OR 13, the second time delay circuit 15 connected by the input to the input of the first inverter 8, the second element 16, the direct input of which is connected to the output of the second chains 15 temporary oh delay, and the inverse input is connected to the output of the first threshold element 12, element 17 "Memory, the installation input of which is connected to the fourth input of block 5, the reset input of the element" Memory is connected to the output of the second element And 16, and the output to the second output node 5 lock. The scheme works as follows. A command block b sends a turn-on signal to the memory installation of element 17 "Memory, as a result of which a signal appears at the output of this element, which turns on the controller 1. Simultaneously, when the start signal is issued, command block 6 removes the turn-off signal from the first input of the element OR 7 and the input of the inverter 8. The signal at the second input of the element OR 7 disappears after a time determined by the circuit 9 of the time delay. The signal delay is necessary to keep the switch 3 on from the moment when the command unit 6 sends a signal to turn on until the voltage on the input of the converter 2 appears. When the drive trips on-line, the circuit operates as follows. For the operative deactivation of the electric drive by the contactor 1, the command unit 6 takes the enable signal at the input of the element 17 "Memory and sends a signal to the input of the time delay circuit 15, the output signal of which is fed to the direct input of the second element 16". In the absence of a signal proportional to The EMF of the engine, at the inverse of the input of the second element I 16, appears at its output a signal arriving at the memory reset input of the element 17. The memory signal at the output of this element disappears and the contactor 1 turns off. The operational shutdown signal of the command block 6 sends a signal to the input of the element OR 7, the output of which is a signal applied to the direct input of the element AND 11. Moreover, in the absence of a signal from the motor EMF at the inverse input of the element 11, it The output signal appears, which is fed to the input of the element OR 13, which ensures the presence of the output signal of the element OR 13, which keeps the switch 3 on after the signal disappears at the second input of the element OR 13 as a result of relieving the voltage at the input of the valve zovatel 2 when disconnecting contactor 1. By means of said device is provided increasing the reliability of the drive and reducing power losses, uluchschits its quality and consequently increases its efficiency. Claim 1. A device for controlling a DC electric drive motor comprising a valve converter connected via a switch to an electric motor, characterized in that, in order to improve the efficiency of the electric drive, a contactor connected inlet to the AC mains and through output - to the valve converter, interlock unit, the outputs of which are connected to the control inputs of the switch and the contactor, and the first two inputs, respectively, to the input and output ohm converter valve, and a command unit which outputs are connected to third and fourth inputs of the lock assembly.

2. The device according to claim 1, characterized in that the blocking node comprises successively connected the first inverter, the first time delay circuit, the second inverter, the first OR element, the first AND element, the second OR element, the second time delay chain connected in series, the second AND element and the element "Memory, the first and second threshold elements, the first input of the first element OR, the input of the first inverter and the input of the temporary delay circuit on the third input of the blocking node, the inverse input of the first element AND connected with the output of the first threshold element and the inverse INPUT of the second element AND, the input of the first threshold element — with the second input of the blocking node, the output of the second element OR — with the first output of the blocking node, the second input of the second element OR with the output of the second threshold element, whose input is connected to the first the input of the blocking node, and the output and the second input of the Memory element are connected respectively to the second output and the fourth input of the blocking node.

Sources of information taken into account during the examination 1. Electric drives complete series

KTE. Catalog 08.30.14-78, “Informelectro,

1978