SU983949A1

SU983949A1 - Electric drive

Info

Publication number: SU983949A1
Application number: SU802876305A
Authority: SU
Inventors: Вячеслав Леонтьевич Анхимюк; Николай Николаевич Михеев; Геннадий Петрович Комлик; Олег Александрович Пашкевич
Original assignee: Белорусский Ордена Трудового Красного Знамени Политехнический Институт
Priority date: 1980-01-28
Filing date: 1980-01-28
Publication date: 1982-12-23

Description

(54; ЭЛЕКТРОПРИВОД(54; ELECTRIC DRIVE

Изобретение относитс к электротехнике и- может быть использовано . дл управлени электродвигателей, работающих в режимах пуска и торможени .The invention relates to electrical engineering and can be used. for controlling electric motors operating in start and braking modes.

Известен электропривод, содержащий электродвигатель посто нного тока, тормозное реле с контактами дл отключени питани блока управлени тиристорного преобразовател , включенного в корную цепь электродвигател , и резистор динамического торможени 1,A known electric drive comprising a direct current electric motor, a brake relay with contacts for disconnecting the power supply to the control unit of the thyristor converter included in the electric motor's main circuit, and the dynamic braking resistor 1,

Наиболее близким к изобретению вл етс электропривод,содержащий электродвигатель посто нного тока, корна обмотка которого подключена к тиристорному преобразователю с блоком управлени , вход которого , св зан с датчиком тока кор и с тахогенератором, сочлененным с валом электродвигател , параллельно корной обмотке электродвигател подключена цепь из последовательносоединенных ключа и резистора динамического торможени С ЗНедостатком известных устройств вл етс то, что в начале торможени в икорной цепи возникает бросок тока большой величины, а затем ток уменьшаетс . При этом динамическое торможение неэффективно, так как диаграмма тока динамического торможени существенно отличаетс от пр моугольной, а тормозной момент значительно снижаетс при уменьшении частоты вращени кор электродвигател .Closest to the invention is an electric drive containing a direct current motor, the main winding of which is connected to a thyristor converter with a control unit, the input of which is connected to a current sensor core and a tachogenerator coupled to the electric motor's main winding. serial key and dynamic braking resistor. The disadvantage of known devices is that at the beginning of braking, a surge occurs in the caviar circuit. a large value, and then the current decreases. In this case, dynamic braking is inefficient, since the diagram of the current of dynamic braking differs significantly from the rectangular one, and the braking torque decreases significantly with decreasing frequency of rotation of the electric motor core.

Целью изобретени вл етс повышение эффективности динамического торможени .The aim of the invention is to increase the effectiveness of dynamic braking.

10ten

Поставленна цель достигаетс тем, что в устройство дополнительно введены диод, стабилитрон и контактор с замыкающим, и размыкающим контактами , причем последовательно сое15 диненные диод, стабилитрон и размыкающий контакт включены в цепь обратной св зи по току, замыкакжий контакт в цепь обратной св зи по скорости, а датчик тока включен между одним из The goal is achieved by the addition of a diode, a zener diode and a contactor with closing and opening contacts, with a series-connected diode, a zener diode and an opening contact being added to the current feedback circuit, a short-circuiting contact to the feedback feedback circuit. and a current sensor is connected between one of

20 зажимов кор электродвигател кой подключени из последовательно соединенных , ключа и резистора динамического торможени .20 terminals of electric motor connection from series connected, switch and dynamic braking resistor.

На чертеже представлена схема уст25 ройства.The drawing shows the layout of the device.

Устройство содержит электродвигатель 1 посто нного тока, корна обмотка которого подключена к тиристорному преобразователю 2 с блоком 3 The device contains an electric motor 1 direct current, the root winding of which is connected to the thyristor converter 2 with block 3

Claims

30, the input of which is connected to the core current sensor 4 and the tachogenerator 5 articulated with the motor shaft 1, is parallel to the core: the winding of the motor 1 is connected to a circuit consisting of a series 6 key 6 and a dynamic braking resistor 7. The device also contains a diode 8, a zener diode 9 and a contactor with closing and opening contacts 10 and 11, with the successively connected diode 8, the zener diode 9 and the opening contact 11 being included in the current feedback circuit, and the closing contact 10 connection speed, and the current sensor 4 is connected between one of the terminals of the electric motor 1 and the connection point of the chain of successively connected switch 6 and the dynamic braking resistor 7. An intermediate amplifier 12 is connected to the speed and current feedback circuit, to one of the inputs of which a signal is supplied from the current-limiting unit 13. The device works as follows. When a braking command is applied, the circuit of the electric motor 1 is connected to a circuit of a series connected dynamic resistor 7 and a switch 6. The opening contact 8 removes the feedback signal for speed and sends a current feedback signal to the input of intermediate amplifier 12. Resistor 7 of dynamic braking is chosen so that the maximum current in the core of electric motor 1 could be more than the allowable current Iddatsop When Zd5p in the circuit of the electric motor 1 of the current Chd5p, the zener diode 9 is punctured and current feedback operates. Thyristor conversion. The driver 2 supplies a voltage that tends to create a current of the opposite direction in the circuit of the electric motor 1, thus maintaining the current in this circuit approximately equal to Zdp. When ok in the circuit of the electric motor, it takes less than Zdop. the current feedback circuit is broken by the zener diode 9 and the thyristor converter 2 is locked. Thus, by changing the parameters of the current feedback circuit, current diagrams can be formed close to rectangular during dynamic braking of the thyristor electric drive, which provides effective dynamic braking with a practically constant braking torque until the motor stops. An electric drive comprising a direct current electric motor, the root winding of which is connected to a thyristor converter with a control unit, the input of which is connected to a current sensor core and a tachogenerator coupled to the motor shaft, is connected in parallel to the main winding of the electric motor connected from dynamic braking resistor, characterized in that, in order to increase the effectiveness of dynamic braking, diodes, a zener diode and a contact are introduced into it op with closing and opening contacts, with diode connected in series, with; abilitron and opening contact .. are included in the current feedback circuit, short circuit contact is connected to the speed feedback circuit, and the current sensor is connected between one of the terminals motor windings and a circuit connection point from a series of connected key and resis-Mount dynamic braking. Sources of information taken into account during the examination 1. Complete thyristor adjustable electric drives of the PTZ and PTZR series. Catalog № 08.18.01-69 Informelectro.

2. Soloduho I.Yu. and others. Thyristor electric DC. Energy, 1971, with. 82

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