SU904175A1

SU904175A1 - Induction electric drive control device

Info

Publication number: SU904175A1
Application number: SU792753995A
Authority: SU
Inventors: Виталий Александрович Фокин
Original assignee: Запорожский машиностроительный институт им.В.Я.Чубаря
Priority date: 1979-04-17
Filing date: 1979-04-17
Publication date: 1982-02-07

Description

Изобретение относится к электротехнике и может быть применено в электроприводах переменного тока с асинхронным электроцвигателем, требующих изменения скорости вращения.The invention relates to electrical engineering and can be used in AC electric drives with an asynchronous electric motor, requiring a change in rotational speed.

Известно устройство для управления ⁵асинхронным электроцвигателем, содержащее два выпрямительных моста, два шунтирующих тиристора, аноды которых соединены с катодными группами соотвег. 10 с1вуюших выпрямительных мостов, два конденсатора, тиристор, анод которого соединен с анодом первого из шунтирующих тиристора, а катод - с катодом второго шунтирующего тиристора, анод которого со-₁₅единен с одной из обкладок первого конденсатора, двухобмоточную Катушку индуктивности и трансформаторный блок, выполненный на двух трансформаторах, первый из которых является трехобмоточным, с одной первичной и двумя вторичными обмотками, одни из выводов первичной обмотки которого снабжены зажимами для подключения к сети. 111 .A device for controlling ⁵ asynchronous electric motors, containing two rectifier bridge, two shunt thyristors, the anodes of which are connected to the cathode groups respectively. 10 s1vuyushih rectifier bridges, two capacitors, thyristor, the anode of which is connected to the anode of the first thyristor of the shunt and the cathode - to the cathode of the second shunting thyristor, the anode of which _co-15 is one with one of the electrodes of the first capacitor, inductance coil and two winding transformer unit configured on two transformers, the first of which is three-winding, with one primary and two secondary windings, one of the terminals of the primary winding of which is equipped with clamps for connecting to the network. 111.

Однако указанное^устройство для управления асинхронным электроцвигателем обладает большими массогабаритными показателями.However, the indicated device for controlling an asynchronous electric motor has large overall dimensions.

Цель изобретения - уменьшение массогабаритных показателей.The purpose of the invention is the reduction of overall dimensions.

Указанная цель достигается Тем, что в устройство для управления асинхронные электроцвигателем, содержащем два выпрямительных моста, два шунтирующих тиристора, аноды которых соединены с катодными группами соответствующих выпрямительных мостов, два конденсатора, тиристор, анод которого соединен с анодом первого шунтирующего тиристора, а катод - с катодом второго шунтирующего тиристора, анод которого соединен с одной из обкладок первого конденсатора, двухобмоточную катушку индуктивности и трансформаторный блок, выполненный на двух трансформаторах, первый из которых снабжен одной первичной и двумя вторичными обмотками, один из выводов первичной обмотки которого снабжен заThis goal is achieved by the fact that in the device for controlling an asynchronous electric motor containing two rectifier bridges, two shunt thyristors, the anodes of which are connected to the cathode groups of the corresponding rectifier bridges, two capacitors, a thyristor, the anode of which is connected to the anode of the first shunt thyristor, and the cathode is connected to the cathode of the second shunt thyristor, the anode of which is connected to one of the plates of the first capacitor, a double-winding inductor and a transformer block made on two trans formators, the first of which is equipped with one primary and two secondary windings, one of the conclusions of the primary winding of which is provided for

904175 . 4 жимами для подключения к сети, оба трансформатора выполнены трехфазными, другие выводы первичной обмотки первого трансформатора соединены со входом первого выпрямительного моста и с од- j ними из выводов статорной обмотки электродвигателя, другие выводы которой соединены с одними из выводов· второй вторичной обмотки первого трансформэтора, другие выводы этой обмотки сое- ι· цннены с выводами вторичной обмотки второго трансформатора,'соединенной в звезду, первичная обмотка Второго трансформатора соединена в звезду и другими выводами г- со. входом второго мостово- 15 го выпрями те ля. и с выводами первой вторичной обмотки первого*трансформатора, соединенной в.звезду* а анодная группа вентилей первого мрстового выпрямителя через первую обмотку к а гущ- 20 ки индуктивности «соединено с катодом первого шунтирующего тирнстрра и с одной из обкладок второго конденсатора, анодная группа второго мостового выпрямителя через вторую обмотку катушки ж индуктивности соединена с катодом второго шунтирующего тиристора и со второй обкладкой'второго конденсатора, анод первого шунтирующего Тиристора соединен со второй обкладкой первого конден- χ сатора.904175. 4 presses for connecting to the network, both transformers are three-phase, the other terminals of the primary winding of the first transformer are connected to the input of the first rectifier bridge and to one of the terminals of the stator winding of the electric motor, the other terminals of which are connected to one of the terminals · of the second secondary winding of the first transformer , the other terminals of this winding are connected ι · to the terminals of the secondary winding of the second transformer connected to the star, the primary winding of the Second transformer is connected to the star and other terminals - with. the entrance of the second bridge, the 15th, with straight bodies. and with the terminals of the first secondary winding of the first * transformer connected to the star * and the anode group of valves of the first mrst rectifier through the first winding to the thicker inductance "is connected to the cathode of the first shunting tirnstra and from one of the plates of the second capacitor, the anode group of the second a bridge rectifier through the second winding of the inductance coil is connected to the cathode of the second bypass thyristor and to the second lining of the second capacitor, the anode of the first bypass thyristor is connected to the second lining of the of a capacitor χ.

На чертеже представлена схема устройства.The drawing shows a diagram of the device.

Устройство для управления асинхронным электродвигателем 1 содержит трехфазный трехобмогочный трансформатор 2 с первичной обмоткой 3, одни из выв о- ι цов которой снабжены зажимами для подключения к сети, первой вторичной обмоткой 4, соединенной в звезду, и вгорой вторичной обмоткой 5, второй трехфазный двухобмоточный трансформатор с первичной обмоткой 7 и вторичной 8, соединенными в звезду, первый выпрямительный мост 9, второй выпрями* _<5гетъный мост 10, первый шунтирующий тиристор 11, второй шунтирующий тиристор 12, тиристор 13, цвухобмоточная катушка 14 индуктивности, первый конденсатор 15 и второй конденсатор 16.A device for controlling an asynchronous electric motor 1 contains a three-phase three-fanned transformer 2 with a primary winding 3, one of the terminals of which is equipped with clamps for connecting to a network, a first secondary winding 4 connected to a star, and a burned-out secondary winding 5, a second three-phase two-winding transformer 7 with the primary winding and secondary 8 connected in star, the first bridge rectifier 9, the second rectifiers * _<5 getny bridge 10, the first bypass thyristor 11, the second shunt thyristor 12, the thyristor 13 to tsvuhobmotochnaya carcass inductor 14, first capacitor 15 and second capacitor 16.

Другие выводы обмотки 3 соединены со входом выпрямительного моста 9 и одним из выводов обмотки статора электродвигателя 1, другие выводы которой 'соединены с одними из выводов обмот— · ки 5, другие выводы которой соединены с выводами обмотки 8. Выводы обмотки соединены с выводами обмотки 4 и входом выпрямительного моста 10. Ка- тодные группы выпрямительных мостов и 10 соединены с соответствующими . анодами шунтирующих тиристоров 11 и 12, аноды тиристоров 11 и 13 соединены между собой непосредственно, аноды тиристоров 12 и 13 соединены через конденсатор 15, а их катоды соединены между собой непосредственно. Анодные группы вентилей выпрямительных мостов Θ и через соответственно первую и вторую обмотки катушки индуктивности 14 соединены с соответствующими катодами тиристоров 11 и 12, подключенными к обкладкам конденсатора 16.Other terminals of winding 3 are connected to the input of the rectifier bridge 9 and one of the terminals of the stator winding of the electric motor 1, the other terminals of which are connected to one of the terminals of the winding · 5, the other terminals of which are connected to the terminals of winding 8. The terminals of the winding are connected to the terminals of winding 4 and the input of the rectifier bridge 10. The cathode groups of the rectifier bridges and 10 are connected to the corresponding ones. the anodes of the shunt thyristors 11 and 12, the anodes of the thyristors 11 and 13 are directly connected to each other, the anodes of the thyristors 12 and 13 are connected via a capacitor 15, and their cathodes are connected directly to each other. The anode groups of the rectifier bridge valves Θ and through the first and second windings of the inductor 14 respectively are connected to the corresponding cathodes of the thyristors 11 and 12 connected to the plates of the capacitor 16.

Устройство для управления асинхронным электроприводом работает следующим образом.A device for controlling an asynchronous electric drive operates as follows.

В результате открытия тиристора 11 первичная обмотка 3 трансформатора 2 и обмотка статора электродвигателя 1 оказываются соединенными в звезду, а их нулевые точки соединенными между собой. При этом в обмотках 4 и 5 наводятся ЭДС и появляется напряжение на обмотке 7 и наводится ЭДС в обмотке 8, согласная с ЭДС в обмотке 5. Эго приводит к созданию магнитного потока в зазоре электродвигателя L. В этот же интервал времени конденсаторы 15 и 16 заряжаются так, что их положительный потенциал прикладывается к катоду тиристора 11 и к аноду тиристора 12, в результате чего тиристор 11 закрывается. После открытия тиристора 13 происходит перезаряд конденсаторов в течение интервала времени пока закрыты тиристоры 11 и 12, после чего тиристор 13 запирается. После открытия тиристора 12 повторяется вышеописанный цикл работы.As a result of the opening of the thyristor 11, the primary winding 3 of the transformer 2 and the stator winding of the electric motor 1 are connected to a star, and their zero points are interconnected. In this case, EMF is induced in windings 4 and 5 and a voltage appears on winding 7 and EMF is induced in winding 8, which is consistent with EMF in winding 5. This leads to the creation of a magnetic flux in the gap of electric motor L. At the same time, capacitors 15 and 16 are charged so that their positive potential is applied to the cathode of the thyristor 11 and to the anode of the thyristor 12, as a result of which the thyristor 11 closes. After opening the thyristor 13, the capacitors are recharged during the time interval while the thyristors 11 and 12 are closed, after which the thyristor 13 is locked. After opening the thyristor 12, the above-described cycle of operation is repeated.

Применение изобретения позволяет уменьшить массогабаритные показатели и обеспечивает экономию электротехнических материалов.The use of the invention allows to reduce overall dimensions and provides savings in electrical materials.

Claims

The invention relates to electrical engineering and can be applied in AC drives with an asynchronous electromotive device, requiring changes in the rotational speed. A device is known for controlling an asynchronous electric motor, containing an rectifying bridge ova, a shunt thyristor, whose anots are connected to cathode groups of the corresponding rectifying bridges, an ov capacitor, a thyristor, whose anode is connected to the anode of the first chistrist chistras. a thyristor, the anode of which is connected to one of the plates of the first capacitor, a two-winding Induction Coil and a transformer-block, made by two transformers, the first and which is triple-wound with one primary and two secondary windings, one of the terminals of the primary winding which is provided with clamps for pooklyucheni network. Ill. However, this device for controlling an asynchronous electric motor has large weight and size parameters. The purpose of the invention is to reduce weight and size parameters. This goal is achieved by teM that, in a device for electrifying a motor with an electric motor containing two rectifier bridges, two shunt thyristors, the anodes of which are connected to cathode groups of the respective rectifying bridges, two capacitors, a thyristor, the anode of which is connected to the anode of the first shunt thyristor, and the cathode is connected to the cathode of the second shuntyruk de thyristor, the anode of which is connected to one of the plates of the first capacitor, a double-wound inductor and a transformer unit made on two tra The transformers, the first of which is provided with one primary and two secondary windings, one of the primary windings of which is equipped with clamps of the output terminal to the seg, both transformers are made of three-phase terminals of the primary winding of the first transformer connected to the outlet of the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the primary rectifier bridge and connected to the first rectifier bridge and connected to the primary rectifier bridge and the main transformer will be connected to the outlet of the first rectifier bridge and connected to the primary rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the first rectifier bridge and connected to the primary rectifier bridge and to the first rectifier bridge, the plug of the first rectifier bridge will be connected to the first rectifier bridge and connected to the primary rectifier bridge with a single rectifier bridge. stator obmopsi. The electric motor, the augies of which are connected with the findings of the second secondary winding of the first transform, and the conclusions of this second winding are connected with the outputs of the secondary of the second transformer / star in the star, the winding of the second transformer is connected to the main transformer / connected to the star, the winding of the second transformer is connected to the main transformer / connected to the star with the input of the second crust line and the broods of the first secondary winding of the first / transformer connected to the anode of the bridge valves # Mithed through the first winding of the inductance connects 9 to the cathode of the first shunt tyrnstrr and from one of the second capacitor plates, the anopna group of the second bridge shunt tyrnstrr and from one of the second capacitor plates, the anopna second bridge bridge the mitel is connected to the cathode of the second shunt thyristor through the second winding of the coil of the inductance and to the second lining of the second capacitor, while the first shunt thyristor is connected to the second o laying of the first capacitor. In the drawing, | a schematic diagram of the device. The device for controlling the induction motor 1 contains a three-phase three-winding transformer 2 with a primary winding 3, the terminals of which are provided with terminals for connection to the network, the first secondary winding 4 connected in a star, and the second secondary winding 5, the second three-phase two-window from transformer 6c primary winding 7 and secondary 8 connected to a star, first rectifying 1v bridge 8, second expiring bridge 10, first shunt thyristor I, second shunt thyristor 12, thyristor 13, double-wrap coil 14 inductance, the first co-capacitor 15 and the second capacitor 16. The other outlets of the winding 3 are connected to the input of the rectifying bridge 9 and one of the terminals of the stator winding of the electric motor 1, the other terminals of which are connected to one of the terminals of the winding 5, the other terminals of which are connected to the terminals of the winding 8 The winding terminals 7 are connected with the winding terminals 4 and the rectifier bridge inlet 10. The cathode rectifier bridges 8 and 1O are connected to the corresponding; the anodes of shunt thyristors 11 and 12, the anodes of thyristors 11 and 13 are interconnected untill, the anodes of ti-tMCTc 9 l and 13 are connected through condensate 15, and their cathodes are interconnected by themselves. The open valve groups of the rectifying bridges 8 and 1O, respectively, through the first and second windings of the inductance coil 14 are connected to the corresponding cathodes of 11 and 12 thyristors connected to the capacitor on the capacitor 16. The device for controlling the asynchronous actuator operates the following way. As a result of opening the thyristor 11, the primary winding 3 of the transformer 2 and the stator winding of the electric motor 1 are connected to a star, and their zero points are connected to each other. In this case, in the windings 4 n 5, a voltage is applied on the winding 7 and a voltage is induced in the winding 8, which agrees with the emf in the winding 5. This leads to the creation of a magnetic flux in the gap of the electric motor 1. In the same time interval, the capacitors 15 and 16 are charged in such a way that their positive potential is applied to the sensor terminal 11 and to the anode of the thyristor 12, as a result of which the thyristor 11 is closed. After the Tyrnstor 13 is opened, the capacitors recharge by the charge for a period of time while the thyristors 11 and 12 are closed, after which the Tyrnstor 13 is locked. After opening the thyristor 12, the cycle of operation described above is repeated. The application of the invention allows to reduce the weight and weight indicators and provides savings of electrical materials. Claims of the Invention Control device for an asynchronous electric motor, containing a seam rectifying bridge, and a thyristor, whose anodes are connected to the cathode groups of the corresponding rectifying bridges, an capacitor capacitor, an anode, which is connected to the anode of the first gate, the cathode capacitor, and the cathode - is the cathode, which is anode connected to the anode of the first gate, the cathode thyristor, and the cathode - is the cathode, which is anode connected to the first shchunter of the thyristor, and the cathode is a - and - the cathode is the iodine. shunt thyristor, the anode of which is connected to one of the plates of the first capacitor, a two-ohm swollen inductance coil and