SU1374384A1

SU1374384A1 - D.c. electric drive

Info

Publication number: SU1374384A1
Application number: SU864151216A
Authority: SU
Inventors: Анатолий Иванович Фролов
Original assignee: Предприятие П/Я А-1319
Priority date: 1986-08-05
Filing date: 1986-08-05
Publication date: 1988-02-15

Abstract

Изобретение относитс к электротехнике и м.б. применено в автоматизированных электроприводах. Цель изобретени - повьшение надежности. Электропривод содержит электродвигатель 1, корна обмотка к-рого через силовой тиристор 2 с блоком 3 управлени подключена к источнику 4 питани , к к-рому через резистор 5 подключена обмотка 6 возбуждени . В исходном АЛЛ положении коммутирующий элемент 15 разомкнут, а размыкающий контакт 18 замкнут. При замыкании коммутирующего элемента 15 и-размыкании размыкающего контакта 18 цепь стабилитрона 13и резистора 14 через тиристор 16 подключаетс к катоду тормозного тиристора 12 и он выключаетс . При размыкании коммутирующего элемента 15 и замыкании размыкающего контакта 18 тиристор 16 и силовой Тиристор 2 остаютс включенными до конца полупериода питающего на:пр жени . В следующий полупериод питающего напр жени тиристоры 16 и 2 закрыты, а тормозной тиристор открываетс током резистора 14и стабилитрона 13. Таким образом, за счет исключени токовой перегрузки тиристоров 2 и 12 путем устранени их одновременного включени повьшает- с надежность электропривода. 1 ил. ю (ЛThe invention relates to electrical engineering and m. applied in automated electric drives. The purpose of the invention is to increase reliability. The electric drive contains the electric motor 1, the main winding of which through the power thyristor 2 with the control unit 3 is connected to the power supply 4, to which the excitation winding 6 is connected via a resistor 5. In the initial ALL position, the switching element 15 is open and the opening contact 18 is closed. When the switching element 15 is closed and the opening contact 18 is disconnected, the circuit of the Zener diode 13 and the resistor 14 is connected through the thyristor 16 to the cathode of the brake thyristor 12 and it is turned off. When the switching element 15 is opened and the opening contact 18 is closed, the thyristor 16 and the power thyristor 2 remain on until the end of the half period of the power supply: the voltage. In the next half-period of the supply voltage, the thyristors 16 and 2 are closed, and the brake thyristor is opened by the current of resistor 14 and Zener diode 13. Thus, by excluding the current overload of thyristors 2 and 12 by eliminating their simultaneous switching on, the reliability of the electric drive increases. 1 il. yu (L

Description

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Изобретение относитс к электро- технике, а именно к автоматизированному электроприводу посто нного ТокаThe invention relates to electrical engineering, in particular to an automated DC electric drive.

Целью изобретени вл етс повышение надежности электропривода.The aim of the invention is to increase the reliability of the drive.

На чертеже приведена схема электропривода посто нного тока.The drawing is a schematic of a DC motor drive.

Электропривод посто нного тока содержит двигатель, корна обмотка 1 которого через силовой тиристор 2 с блоком 3 управлени подключена к источнику 4 питани , к которому чере резистор 5 подключена обмотка 6 возбуждени , вывод которой подключен к аноду первого разделительного диода 7, катод которого соединен через второй разделительный диод 8 с блоком 3 управлени . Якорна обмотка 1 шунтирована обратным диодом 9 и по- следовательно соединенными тормозным резистором 10, диодом 11 и тормозным тиристором 12, анод которого соедине с катодом первого разделительного диода 7, а управл ющий электрод че- рез стабилитрон 13 и второй резистор 14 соединен с выводом Плюс источника 4 питани . Электропривод также содержит коммутирующий элемент 15,The DC drive contains a motor, the root winding 1 of which is connected via power thyristor 2 with control unit 3 to the power supply 4, to which across the resistor 5 is connected an excitation winding 6, the output of which is connected to the anode of the first separation diode 7, the cathode of which is connected through the second separation diode 8 with control unit 3. The anchor winding 1 is shunted by a reverse diode 9 and successively connected by a brake resistor 10, a diode 11 and a brake thyristor 12, the anode of which is connected to the cathode of the first separating diode 7, and the control electrode through Zener diode 13 and the second resistor 14 is connected to the Plus terminal 4 power supply. The drive also contains a switching element 15,

Силовой тиристор 2 включаетс и на корную обмотку 1 подаетс напр жение источника 4 питани .The power thyristor 2 is turned on and the supply voltage 4 of the power supply 4 is applied to the main winding 1.

При размыкании коммутирующего эле мента 15 и замыкании размыкающего контакта 18 тиристор 16 и силовой тиристор 2 остаютс включенными до конца полупериода питающего напр жени . В следующий полупериод питающего напр жени тиристоры 16 и 2 закрыты , а тормозной тиристор открываетс током резистора 14 и стабилитрона 13.When the switching element 15 is opened and the opening contact 18 is closed, the thyristor 16 and the power thyristor 2 remain on until the end of the half-period of the supply voltage. In the next half-period of the supply voltage, the thyristors 16 and 2 are closed, and the brake thyristor is opened by the current of the resistor 14 and the zener diode 13.

Таким образом, за счет исключени токовой перегрузки тиристоров 2 и 12 путем исключени их одновременного включени повыщаетс надежность электропривода .Thus, by eliminating the current overload of the thyristors 2 and 12 by eliminating their simultaneous switching on, the reliability of the electric drive increases.

Claims

Invention Formula

An electric current drive containing a motor, the root winding of which through a power thyristor with a control unit is connected to a power source, to which a field winding is connected through a resistor, the output of which is connected to an

the thyristor 16, the second diode 17. The commutation switch 30 of the first isolating diode, the rotary element 15 is provided with an opening contact 18. The common connection point of the Zener diode 13 and the second resistor 14 is connected through the thyristor 16 to the Minus terminal of the power supply 4, and through the switching element 15 - with the control A thyristor electrode 16 is connected. The second diode 17 shunts the excitation winding 6 and the disconnecting contact 18 of the switching element 15 is connected to the cathode and the control electrode of the power thyristor 2.

The drive works as follows.

In the initial position, the switching element 15 is open, and the opening contact 18 is closed. In this case, the brake thyristor 12 is opened by the current supplied to its control electrode through the Zener diode 13 and the resistor 14. When the switching element 15 is closed and the disconnecting contact 18 is opened, the Zener diode circuit 13 and the resistor 14 are connected to the cathode of the brake thyristor 12 and it off.

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whose diode is connected via a second isolating diode to a control unit, the root winding is shunted by a reverse diode and connected in series by a braking resistor, a diode and a braking thyristor, the anode of which is connected to the cathode of the first isolating diode, and the control electrode is connected to the output source of the diode power supply, switching element, which is characterized by the fact that, in order to increase reliability, a thyristor, a second diode, is introduced into it, and the switching element is provided with a break contact while the common point of connection of the Zener diode and the second resistor is connected via a thyristor with the Minus power supply terminal, and through a switching element to the thyristor control electrode, the second diode shunts the excitation winding, and the break contact of the switching element is connected to the cathode and control electrode of the power thyristor .

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