SU1654961A1 - Pulse rotation rate controller for dc motors - Google Patents

Abstract

The invention relates to electrical engineering and can be used in various automation devices for controlling rotational frequencies by an operator. The purpose of the invention is to increase reliability, ease of adjustment and simplification. The device contains working 3 and switching 14 thyristors, switching capacitor 15, phase-shifting circuits 23 and 24 controlling thyristors 9 and 14. Variable resistors 29 and 30 phase-shifting circuits are made in the form of a paired potentiometer. The use of an independent series resonant charge circuit of the switching capacitor 15 increases the reliability of turning off the working thyristor 9 while simplifying the device. 1 il.

Description

The invention relates to electrical engineering and may find application in various automation devices for controlling the speed of an operator.

The aim of the invention is to increase reliability, facilitate regulation and simplification.

The drawing shows a diagram of the controller.

The pulse speed controller of a DC motor contains two input terminals 1 and 2 for connecting a DC power source 3 and two output terminals 4 and 5, between which a discharge diode 6 is connected, for connecting an armature of a motor 7 with an excitation winding 8. The first input 1 and output 4 terminals are connected by a common bus, and the second terminals 2 and 5 are connected in series by a working thyristor 9, shunted by a reverse diode 10, and two windings 11- and 12 of the inductor 13, to the common point of which is connected the cathode of the switching thyristor 14. Switching a capacitor 15 connected between the anodes of the working 9 and the switching 14 thyristors, is also connected to the charging circuit composed in series with the third secondary winding 16 of the transformer 17, a diode 18, an additional inductor 19 and a variable cut side 20. To the first two secondary windings 21 and 22 of the transformer 17 are connected phase-shifting RC circuits 23 and 24 with isolation diodes 25 and 26, capacitors 27 and 28 and variable resistors 29 and 30 formed by a paired potentiometer. The outputs of these circuits 23 and 24 are connected to the control transitions of respectively switching 14 and working 9 thyristors.

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The primary winding 31 of the transformer 17 is connected to the terminals 32 and 33 for connecting an AC power source. The variable resistors 29 and 30 are turned on so that when you turn the knob of the paired potentiometer, the resistance of one of them increases, and the other decreases.

The regulator operates as follows.

In the series oscillatory circuit, the diode 18 is switched on so that the switching capacitor 15 is always charged at the beginning of those half-periods of the voltage of the transformer 17, in which the operating thyristor 9 is turned on and the switching thyristor 14 is turned off. The capacitor 15 is discharged only in the subsequent half-cycles along the circuit: open switching thyristor 15, the winding 11 of the inductor 13, the reverse diode 10. In this case, the working thyristor 9 is locked, and the switching one is locked by natural switching. In the next period, the processes are repeated.

The serial oscillatory circuit provides a charge of the capacitor 15 to a double value of the average voltage rectified by the diode 18 during a time much shorter than the half-period of the voltage of the winding 16, which allows you to turn off the working thyristor 9 for almost any duty cycle and increases reliability while simplifying the device. The use of a paired potentiometer in phase-shifting circuits 23 and 24 facilitates the regulation of the rotational speed of the electric motor.

Claims (1)

Claim A pulse regulator of the rotational speed of the DC motor, comprising two input terminals for connecting a DC power source and two output terminals, between which a discharge diode is connected for connecting the electric motor, the first input and output terminals connected by a common bus, and the second connected in series with the operating thyristor, a shunted reverse diode, and two inductor windings, to the common point of which is connected the cathode of the switching thyristor, a switching capacitor, connected to to the anodes of the working and switching thyristors, a variable resistor, a transformer, to the two secondary windings of which phase-shifting RC circuits with diode diodes are connected, while the variable resistors of these circuits are formed by a paired potentiometer, and the output of one of them is connected to the control transition of the switching thyristor, to the output the third secondary winding of the transformer is connected to a diode, and the primary winding of the transformer is connected to the terminals for connecting an AC power source, about t and 5 1654961 6, which, in order to increase reliability, facilitate regulation and simplification, an additional inductor is introduced into it, while the circuit from the third secondary winding of the transformer, diode, additional inductor and variable resistor is connected in series to the switching capacitor, and the output the second phase-shifting RC circuit is connected to the control transition of the working thyristor. Editor I. Derbak Compiled By B, Pospelov Tehred D. Serdyukova Corrector A. Obruchar Zzzkaz 1958 Circulation 357 Subscription VNIIIPI State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, RauShskaya nab., 4/5 Production and Publishing Plant Patent ¹ ', Uzhgorod, st. Gagarina, 101