SU847476A1

SU847476A1 - Method of control of dc motor braking

Info

Publication number: SU847476A1
Application number: SU782563855A
Authority: SU
Inventors: Вячеслав Михайлович Харламов; Сулейман Даниэлевич Муллаканд
Original assignee: Предприятие П/Я Г-4617
Priority date: 1978-01-02
Filing date: 1978-01-02
Publication date: 1981-07-15

Description

(54) СПОСОБ УПРАВЛЕНИЯ ТОРМОЖЕНИЕМ ЭЛЕКТРОДВИГАТЕЛЯ ПОСТОЯННОГО ТОКА(54) METHOD OF MANAGING THE DRAWNING OF A DC MOTOR MOTOR

1one

Изобретение относитс к электротехнике , а именно к управлению торможением электродвигател посто нного тока.This invention relates to electrical engineering, in particular, to control of braking of a direct current electric motor.

Известен способ управлени торможением электродвигател посто нного тока путем реверса тока возбуждени , при котором сигнал начала реверса тока возбуждени выдаетс только при снижении тока кор ниже определенного , наперед заданного значени i.There is a known method of controlling the braking of a direct current motor by reversing the excitation current, in which the signal for the onset of the reversal of the excitation current is emitted only when the core current drops below a certain predetermined value i.

Однако этот способ может быть применен только дл торможени электропривода , имеющего посто нный момент сопротивлени .However, this method can only be applied for braking an electric drive with a constant moment of resistance.

Наиболее близким к изобретению по технической сущности вл етс способ управлени торможением электродвигател посто нного тока независимого возбуждени , при котором по команде Торможение снижают ток Кор и производ т , реверс тока возбуждени 12.The closest to the invention in its technical nature is a method of controlling the deceleration of a direct current motor of independent excitation, in which, by a command, Deceleration reduces the Cor current and produces an inversion of the excitation current 12.

Недостатками известного способа вл ютс возможность применени егоThe disadvantages of this method are the possibility of applying it.

только дл торможени электроприводов , имеющих посто нный момент нагрузки на валу электродвигател , и опасность возникновени аварийных режимов в корной цепи двигател при торможении электропривода с переменной нагрузкой.only for braking electric drives having a constant torque on the motor shaft, and the danger of emergency conditions in the engine crankshaft when braking the electric drive with a variable load.

Цель изобретени - расширение диапазона .нагрузок на валу электродвигател и предотвращение аварийных режимов его работы.The purpose of the invention is the expansion of the range of loads on the motor shaft and the prevention of emergency modes of its operation.

Указанна цель достигаетс тем, что перед командой Торможение запоминают величину тока кор в рабочем режиме, после чего величину снижаемого тока кор по команде Торможение сравнивает с запомненной и при превышении полученной разницы наперед заданного значени производ т реверс тока возбуждени .This goal is achieved by remembering the value of the core current in the working mode before the Deceleration command, after which the value of the reduced current of the core is calculated by the command Deceleration compared to the memorized current and if the resulting difference exceeds the preset value, the excitation current is reversed.

Claims

The drawing shows a device that implements the proposed method. An irreversible thyristor converter 1 with a control system 2 supplies the core of a DC motor with a rectified current 3. A memory device 5, a comparison node 6 and a threshold element 7 are supplied to the output of current sensor 4. DC excitation winding 8 is powered by a reverse thyristor converter 9 with control system 10. When the drive is in operation, a signal proportional to a given speed is fed through control system 2 to the input of an irreversible thyristor converter 1. The voltage at the output of the thyristor converter 1 determines the speed of rotation of the electric motor core 3. A signal proportional to the current of the electric motor core 3, through the current sensor 4, enters the memory 5. When a decrease speed signal is applied to the input of the system 2 of the control, the current of the electric motor core 3 decreases and at the output of the comparison node a signal proportional to the difference stored in memory 5 and current values of current. The signal from the output of the comparison node 6 enters the input of the threshold element 7, which passes the signal only when it exceeds a predetermined level. From the threshold element 7, the signal enters the excitation current control system} 0, which causes a polarity reversal at the output of the inverter1 of the converter 9, therefore, the current is reversed in the excitation winding of the electric motor. The invention allows to extend the range of loads on the motor shaft and prevent emergency operation of its operation. Claim Method A method of controlling the braking of a direct current motor of independent excitation, in which, by command, braking reduces the current of the core and reverses the excitation current, characterized in that, in order to expand the range of loads on the motor shaft and prevent its emergency operation, before the Braking Command remember the magnitude of the current core in the operating mode, after which the magnitude of the reduced current of the core on the command of Braking is compared with the memorized and when the difference is exceeded before the predetermined value, the excitation current is reversed. Sources of information taken into account during the examination 1. Patent. GDR No. 87859, Clo And 02 R 13/24, 1972.

2. Automated electric drive in the national economy, v. I.-M., Energie, 1971, p. 266.