SU838987A1

SU838987A1 - Electric drive for ac generator

Info

Publication number: SU838987A1
Application number: SU792772519A
Authority: SU
Inventors: Валерий Александрович Бухов; Альберт Алексеевич Антоненко
Priority date: 1979-05-29
Filing date: 1979-05-29
Publication date: 1981-06-15

Description

(54) ЭЛЕКТРОПРИВОД ДЛЯ ГЕНЕРАТОРА ПЕРЕМЕННОГО ТОКА(54) ELECTRIC ACTUATOR FOR ALTERNATING CURRENT

II

Изобрете1ше относитс к электротехнике и может быть использовано в качестве электропривода преобразовательной установки с генератором переменного тока.The invention relates to electrical engineering and can be used as an electric drive of a converter plant with an alternator.

Известны электроприводы со стабилизацией скорости вращени изменением потока возбуждени двигател посто нного тока и применением обратной св зи по скорости, воздей ствующей через блок фазового управлени на полупроводниковый вентильный преобразователь , подкнюченгшш к обмотке возбуждени двигател 1.Electric drives are known with stabilization of rotational speed by varying the excitation flow of a direct current motor and applying speed feedback acting through the phase control unit on the semiconductor gate converter, connected to the excitation winding of the motor 1.

Наиболее близким по технической сущности к изобретению вл етс электропривод генератора переменного тока, содержащий электродвигатель посто нного тока с установленными на его валу тахогёнератором, управл емый выпр митель, подключенный выходом к обмотке возбуждени электродвигател , а вхо- дом через блок фазового управлени к выходам задатчика скорости и тахогенератора. В этой схеме напр жение, пропорциональное скорости вращени , сравниваетс с напр жением задатчика, и их разность воздействуетThe closest to the technical essence of the invention is the electric drive of the alternator, which contains a DC motor with a tachogenger installed on its shaft, a controlled rectifier connected by an output to the motor excitation winding, and an input through the phase control unit to the speed master outputs and tachogenerator. In this circuit, the voltage proportional to the rotational speed is compared to the setpoint voltage, and their difference is affected by

,на управл емый выпр митель, подключенный к обмотке возбуждени электродвигател таким образом, что скорость вращени остаетс посто нной 2., to a controlled rectifier connected to the motor excitation winding in such a way that the rotational speed remains constant 2.

Недостатком устройства вл етс то, что процесс отработки изменени скорости осуществл етс посто нно по мере возрастани ошибки рассогласовани и дл обеспечени высокой точности требуетс иметь большой коэффициент усилени в контуре регулировани , что в свою очередь ухудциет устойчивость . Введение в контур регулировани дополнительных структурных св зей приводит к усложнению схемы и не всегда дает положительный результат.The drawback of the device is that the process of changing the speed is carried out continuously as the error error increases and to ensure high accuracy it is necessary to have a large gain in the control loop, which in turn deteriorates the stability. The introduction to the contour of regulating additional structural links leads to a complication of the scheme and does not always give a positive result.

Claims

The purpose of the invention is to improve the accuracy of stabilization of the rotation speed. . The goal is achieved by addition of a series-connected RLC circuit, a rectifier and an RC filter to a known AC generator, the input of the RLC circuit under the keys to the output terminals of the AC generator and the output of the RC filter to the winding excitation of the tachogenerator. The drawing shows an electric drive circuit, It contains a motor 1 of constant current tachogenerator 2, speed reference 3, phase control unit 4, controlled rectifier 5, the output of which is connected to excitation winding 6 of motor 1, inverter 7, RLC circuit 8 and RC-filter 9. A tachogenerator 2, the excitation winding of which is connected via RC-filter 9 to the output terminals of rectifier 7, is rigidly connected to the motor shaft 1, the RLC circuit 8 to its VYHY1DOM is connected to the input terminals of the rectifier 7, and the input to the generator terminals and AC 10 soedinegshogo the shaft of the motor 1. The apparatus operates as follows. When the motor rotates, the tachogenerator voltage, proportional to the square of the speed of rotation, is compared with the setpoint, and the resulting difference signal is converted by the block 4 into phase-shifted pulses, including the valves of the controlled rectifier 5, the output voltage of which changes in such a way that the speed of rotation it remains just nna. The power supply winding of the tachogenerator with voltage dependent on the rotational speed changes the steepness of its characteristics and gives it non-shorter properties, as a result of which the stabilization accuracy of the speed increases while maintaining sufficient stocks of resistance. An electric drive for an alternator comprising a direct-current electric motor c. mounted on its shaft by a tachogenerator, a controlled rectifier connected by an output to the field winding of an electric motor, and an input through a phase control unit to the outputs of the speed setter and tachogenerator, in order to increase the accuracy of stabilization of the rotation speed RLC-circuits connected in series, a rectifier and an RC-filter, the input of the RLC-circuit connected to the output terminals of the alternator and the output of R & the filter is connected to the excitation winding of the tachogenerator. Sources of information taken into account during the examination 1. Arkhangelsky V. N. The system of reversible electric drives. Kiev, Technique, 1972.

2. Patent Czechoslovakia No. 136323, cl. 21 df 12/07, 1970.