SU1644085A1 - Regulator of speed of rotation of dc motor - Google Patents

Abstract

The invention relates to automation and can be used to generate control signals for feedback and correction in gyroscopic systems of automatic control and regulation. The purpose of the invention is to reduce the duration of the transient process when the magnitude of the load and voltage of the engine power source is changed. The controller contains a master pulse generator 1, a pulse counter 2, two triggers 3 and 4, a pulse shaper 5, built on two triggers 6 and 7, input 3 and output 9 tires. The duration of the transient process is reduced due to the fact that the engine is connected to the power source if its rotational speed is less than the required one, and is turned off if its rotational speed is more than the reference. 2 Il. (L

Description

The invention relates to automation and can be used for generating feedback and correction control signals in gyroscopic automatic control and regulation systems.

The aim of the invention is to reduce the duration of the transient process when changing the magnitude of the load and the voltage of the motor power source,

Figure 1 shows the block diagram of the controller; 2 shows timing diagrams for his work.

The speed regulator consists of a master pulse generator 1,

counter 2 pulses, the first 3 and second 4 triggers, the driver 5 pulses, built on triggers 6 and 7, input 8 and output 9 tires.

The regulator works as follows.

In the initial state, the trigger 6 at the inverse output has a logical unit of 1 and, accordingly, the trigger 7 is in the state of logical 0 at the output.

When a signal is received from the speed sensor (DC) (see Fig.2a) on the input bus 8 to the C input of the trigger 6, it switches to the output setting Ј 4

About 00

ate

a logical unit is fed to the D input of the fourth trigger 7. The first pulse from the pulse generator 1 (see Fig. 26) arrives at the C input of the trigger 7, switches it, and at the output of the driver 5 (see Fig. 2c) a logical unit is established. This signal is set to the zero state of the pulse counter 2 (see Fig. 2d) and the first trigger 3 (see Fig. 2d), and also in the initial state, there is a trigger 6 through feedback on the S input. The next pulse of the pulse generator 1 sets the trigger 7 to the initial state. Thus, each pulse input through the input bus 8 from the speed sensor results in the appearance at the output of the trigger 7 (shaper 5) a short pulse equal to the period of the generator 1 (see Fig. 2c). In the period between the pulses delivered over the bus 8 from the DC, the counter 2 counts the number of pulses of the master oscillator 1. Let the period of 5 pulses (see Fig. 2c) exceed the value

 (n + 1),

where Tg is the period of the master oscillator 1;

To - the capacity of the counter 2; T is the period (current) of impulses arriving via bus 8 from

DS

In this case, at the output N of the counter 2, a pulse appears (see Fig. 2d) which switches to the logical I state of the flip-flops 3 and 4 via the S inputs (see Fig. 2d, e). A signal from the output of the trigger 4 via the output bus 9 connects the power source to the engine. The impulse from the output of the pulse shaper 5 switches the trigger 3 to the initial state, and also resets the counter 2.

Thus, with (H-3), i.e. when the frequency (speed) of rotation of the engine is less than the specified one, there is a logical unit on the output bus 9 of the regulator that connects the power supply to the engine, so. most forced to increase the speed of rotation. Moreover, the frequency (period) of the master oscillator 1 Tg is chosen as

mr

one

(N + l) f0

where f0 is the required frequency (speed) of engine rotation.

At the same time, the capacity of the counter 2 is determined from the ratio

5 0 5

0

g

about 5

Q

And -

f where (y is permissible relative

the error frequency (speed) of rotation of the engine.

In this case, if the current engine speed becomes TL j-sTfXH-l), counter 2 does not have time to fill, because before it is filled from the output of the driver 5 (trigger 7), it is reset to its original state. The same signal, the input to the C input of the trigger 4 (see Fig. 2c, e), switches it to the initial zero state. The output bus 9 then receives a logical zero signal, which cuts off the power supply to the engine. Thus, the engine begins to reduce the rotational speed until it goes to the required rotational speed (ffl), and going to (H-1) on the output bus 9, again the logical unit that connects the power supply to the engine again increase the speed of rotation. Further, the processes are repeated.

Thus, in the proposed controller, the motor will be connected to a power source if its current frequency (speed) of rotation (T, 6) is less than the required one (fQ), and will be turned off if its frequency is greater than the specified one. Therefore, when the load or voltage of the power supply is changed, the transient time is reduced, since the power supply is permanently connected to the motor if and continuously disconnected when

xLul / fo.

Claims (1)

1. The regulator of the rotational speed of the DC motor, which contains the master pulse generator, the pulse shaper, the first and second triggers, the first input of the pulse shaper is the regulator input, the output of the second trigger is an output of the regulator that, in order to reduce the duration of the transient process when the load changes and the voltage of the power source, a pulse counter is entered into it, the information input of which is connected to the output of the master pulse generator, the output of the pulse counter It is connected to the S inputs of the first and second triggers, the output of the first trigger is connected to the D input of the second trigger, the C input of which is connected to the output of Lyurmirov2. The regulator according to claim, which is based on the fact that the pulse scavenger contains two triggers, the C input of the first trigger is the first input of the pulse former, the second input of which is the C input of the second trigger, the output of the second trigger is connected with S-in pulse bodies, R-input of the first trigger-JQ house of the first trigger and the output of the generator and R-input of the counter, output of the pulse generator, D-input of the second 1 pulse generator connected to the second input of the rammer - trigger, the D-input of which is connected to the pulse. with a common bus. Compiled by S.Nikishov Editor Ivanov Tehred A. Kravchuk 1 Thebes. I Proofreader T.Malets