SU830623A1

SU830623A1 - Device for impactless starting of industion motor

Info

Publication number: SU830623A1
Application number: SU782701295A
Authority: SU
Inventors: Николай Петрович Чернов; Арефий Семенович Сазонов
Original assignee: Предприятие П/Я А-7374
Priority date: 1978-12-25
Filing date: 1978-12-25
Publication date: 1981-05-15

Description

(54) УСТРОЙСТВО ДЛЯ БЕЗУДАРНОГО ПУСКА АСИНХРОННОГО ДВИГАТЕЛЯ(54) DEVICE FOR IMMEDIATE STARTING OF ASYNCHRONOUS ENGINE

один синхроимпульс на включение тиристоров .. Реализаци устройства на транзисторах делает его излишне громоздким и сложным дл настройки.one sync pulse to turn on the thyristors .. The implementation of the device on transistors makes it unnecessarily cumbersome and difficult to configure.

Цель изобретени - повышение быстродействи и упрощение устройства дл безударного пуска асинхронного двигател .The purpose of the invention is to improve the speed and simplify the device for a shock-free start of an induction motor.

Указанна цель достигаетс тем, что устройство снабжено трем пороговыми схемами, одна из которых подключена параллельно первой указанной пороговой схеме, входы-двух других подключены ко второму выходу трансформаторного датчика состо ни фаз сети, а ик выходы - ко входу блока окончательного пуска, причем блоки первоначального и окончательного пуска снабжены R-S-триггерами, установленными на выходе указанных блоков , и логическими элементами И-НЕ на выходе этих блоков, в каждом из указанных блоков пуска вход R триггера соединен с выходом логического элемента И-НЕ, вход S триггера подключен ко входу логического элемента И-НЕ, образующему первый вход данного блока пуска, а выход R-S триггера блока первоначального пуска соединен со входом S триггера блока окончательного пуска.This goal is achieved by the fact that the device is equipped with three threshold circuits, one of which is connected in parallel to the first specified threshold circuit, the inputs of the other two are connected to the second output of the transformer sensor of the mains phase state, and the IR outputs to the input of the final start block, and the initial and the final start-up is equipped with RS-triggers installed at the output of the specified blocks, and logical elements AND-NOT at the output of these blocks, in each of these start-up blocks the input R of the trigger is connected to the output logical AND-NO, the input S connected to the trigger input of a logic AND-NO element forming the first input of the start block, and the output of R-S flip-flop initial starting block connected to the input S of the final start trigger block.

На чертеже представлена схема устройства дл безударного пуска асинхронного двигател .The drawing shows a diagram of the device for a shock-free start of an asynchronous motor.

Устройство содержит блоки 1,2 тиристоров, включенные в фазы статорных обмоток асинхронного двигател 3, блоки управлени 4,5, к одним входам которых подключен выход датчика 6 состо ни тиристоров. Ко .второму входу блока управлени 4 подключен выход блока 7 первоначального пуска, составленного из логического элемента и R-S-триггера 9. Ко второ 1у входу блока 5 подключен выход блока 10 окончательного пуска, составленного из логи4ecKqtro элемента И-НЕ 11 и R-Sтриггера 12. К входу логического элмента 8 подключен выход R-S-триггер 13, входы которого подключены соответственно к кнопкам Пуск 14 и 15. Выход логического элемента И-НЕ 8 соединен с входом R триггера 9, вход S которого подключен к первому входу логического элемента И-НЕ 8, а выход этого триггера подключен к S-входу триггера 12, подключенному к первому входу логического элемента И-НЕ 1 Ко вторым входам логических элементов И-НЕ 8 и 11 подключены выходы пороговых схем 16,17 и 18,19 соответственно , ко входам которых подключены выходЬа трансформаторного датчика 20 состо ни фаз сети: ко входам пороговых схем 16 и 17 подключена фаза С вторичной обмотки трансформаторного датчика 20, а коThe device contains blocks 1.2 of thyristors included in the phases of the stator windings of the induction motor 3, control blocks 4.5, to one input of which the output of the sensor 6 of the state of the thyristors is connected. To the second input of the control unit 4 is connected the output of the initial start block 7, composed of a logic element and RS flip-flop 9. The output of the final start block 10, composed of the 4E logKqtro element AND-HE 11 and the R-Strigger 12, is connected to the second 1st input of block 5 . To the input of logic logic 8 is connected the output of RS-trigger 13, the inputs of which are connected respectively to the Start buttons 14 and 15. The output of the logical element AND-NE 8 is connected to the input R of the trigger 9, the input S of which is connected to the first input of the logical element AND-NOT 8, and the output of this trigger and connected to the S-input of the trigger 12, connected to the first input of the logical element AND-NOT 1 To the second inputs of the logical elements AND-NOT 8 and 11 are connected the outputs of the threshold circuits 16,17 and 18,19, respectively, to the inputs of which are connected the outputs of a transformer sensor 20 states of the mains phases: the inputs C of the threshold circuits 16 and 17 are connected to the phase C of the secondary winding of the transformer sensor 20, and

входам пороговых схем 18,19 - вывод фазы А, последовательно соединенной с фазой В вторичной обмотки трансформаторного датчика 20.the inputs of the threshold circuits 18,19 - output phase a, serially connected to phase b of the secondary winding of the transformer sensor 20.

Вместо двух последовательно 5 соединенных фаз А и В вторичной обмотки трансформаторного датчика можно использовать одну фазу в этой обмотки с последовательно включенным звеном посто нного запазQ дывани на 30 эл град, или фильтр в виде R-S-цепи.Instead of two in series 5 connected phases A and B of the secondary winding of a transformer sensor, one phase can be used in this winding with a series-connected constant-delay link of 30 e hail, or an R-S filter.

Устройство работает следующим образом.The device works as follows.

При подаче питани в устройство на выходе триггера 13 устанавливаетс сигнал нуль, который подаетс на вход S триггера 9 и на вход элемента И-НЕ 8, блокиру сигнал, поступающий с выхода пороговых схем 16 и 17 на вход логического элемента И-НЕ 8, и устанавлива выходной сигнал единица логического . элемента И-НЕ 8, который подаетс на вход R триггера 9. На его инверсном выходе по вл етс сигнал 5 нуль, который подаетс на блок управлени 4, запреща подачу импульсов на блок тиристоров 2, на вход триггера 12 и на вход логического элемента И-НЕ 11,.блоки0 РУ сигнал, поступающий с выхода пороговых схем 18 и 19 на вход логического элемента И-НЕ 11, устанавлива сигнал единица на выходе Логического элемента И-НЕ с 11, который подаетс на вход R триггера 12. С инверсного выхода триггера 12 подаетс сигнал нуль на блок управлени 5, запреща подачу импульсов на блок тиристоров 1.When power is supplied to the device, a zero signal is set at the output of the flip-flop 13, which is fed to the input S of the flip-flop 9 and to the input of the element IS-HE 8, blocking the signal coming from the output of the threshold circuits 16 and 17 to the input of the logical element IS-HE 8, and set the output signal to a unit of logic. element IS-HE 8, which is fed to the input R of the trigger 9. At its inverse output, a signal 5 appears, which is fed to the control unit 4, prohibiting the supply of pulses to the thyristor block 2, to the input of the trigger 12 and to the input of the logic element AND -NON 11, .0 RU signal, coming from the output of threshold circuits 18 and 19 to the input of the NAND gate 11, sets the signal to 1 at the output of the NAND gate from 11, which is fed to the input R of the trigger 12. From the inverse output trigger 12 is given a zero signal to the control unit 5, prohibiting the impulse 1 to a thyristor unit.

Claims

When you click on the Start button 14 0, the trigger 13. will reset. The input S of the trigger 9 and the input of the logic element. AND-NO 8 signal is one, and the output signal of the logic element AND-NOT 8 depends on the signal from the output of the threshold circuits 16 and 17. When the voltage of the phase C of the secondary winding of the transformer sensor 20 through zero, when the linear voltage is maximal, the threshold circuits 16 and 17 emit pulses Zina 3-4 eHeg., and the output of the logical element IS-HE 8 appears well; is fed to the input R of the trigger 9. The trigger 9 is thrown and the enable signal is sent one per block To control 4, to the input S of the trigger 12 and to the input of the logic element AND-NOT 11. In the presence of the enable signal from the sensor 6 60, the thyristors 2 are pulsed, and the motor is connected to two phases of the network: A and B. Output. the signal of the NAND gate 11, depending on the signal from the output of the threshold circuits 18 and 19, becomes zero when the linear voltage goes over zero, when the voltage of the phase C is maximum, and is given to the input R of the trigger 12, which ry is being transferred. At the inverted output of the trigger 12, the signal unit 1, in the presence of an enable signal from sensor 6, enables the supply of control pulses to the thyristor unit 1, and the motor is connected to the third phase C of the mains supply. The acceleration of the engine starts. All the triggers remain in the indicated states until the Stop 15 button is pressed, after which the triggers 9,12, having switched, give the inhibiting signal zero to the input of the control units 4.5, blocking the supply of control pulses to all the thyristors. The engine is disconnected from the network. The introduction of three threshold circuits and the execution of start-up blocks on RS-triggers with input logic increases the device speed by half by reducing the pause to switch; since in one period of synchronization voltage of the network, two impulses occur during any voltage transition Through Hyjlb . Increasing the speed improves the dynamics, especially in low-power reversible electric drives. Transferring a device to a new element base leads to a simplified control scheme and a reduction in its cost. The invention The device for a shock-free start of an induction motor, containing thyristor blocks included in the phases of the stator windings of the motor, the control inputs of each of which are connected to the corresponding control unit, the thyristors state sensor, the output connected to the inputs of the control units, is the initial start unit, one the input of which is connected to the output of the RS-flip-flop, connected to the Start and Stop buttons, and the other input is connected via a threshold circuit to one output of the transformer sensor No network phases, a final start block whose output is connected to the input of another control unit, characterized in that, in order to improve speed and simplify, the device is equipped with three threshold circuits, one of which is connected in parallel to the first specified threshold circuit, the inputs of the other two are connected to to the second output of the transformer sensor of the state of the mains phases, and their outputs to the input of the final start block, the initial start and final start blocks are provided with RS-triggers set to the output The specified start blocks, and the NAND logic elements at the inputs of these blocks, in each of the specified start blocks, the R input of the trigger is connected to the output of the NAND logic element, the S input of the trigger is connected to the input of the logical NAND element, forming the first input of this of the start-up unit, and the output of the IS-S trigger of the unit, of the initial start-up is connected to the input S of the trigger trigger of the final start-up unit. Sources of information, rintye taken into account in the examination 1. The author's certificate of the USSR 221117, cl. H 02 R 1/26, 1968.

2. Authors certificate of the USSR 516164, cl. H 02 R 1/18 ,. 1970 (prototype).