SU1207923A1 - Device for controlling electromagnetic vibrator - Google Patents

Description

The invention relates to devices for controlling electromagnetic vibrators and can be used in vibrating transport technology.

The purpose of the invention is to improve the accuracy of the operation of the device and thereby ensure a constant performance of the vibrator.

Fig, 1 shows a block diagram of the device; 2 is a circuit diagram in principle; FIG. 3 is a voltage chart.

Electromagnetic vibration drive contains a power source 1, sensor 2, amplifier 3, driver 4 pulses, thyristor converter 5, electromagnetic vibrator 6, RC circuit 7 and transistor switch 8.

The power supply 1 via a rectifier 9 (Fig. 2), for example, a bridge of diodes, is connected to a transistor switch 8 / consisting of series-connected transistors 10 and 11, and through a diode 12 to a transistor 13,

The output of the transistor 10 is connected to the charging circuit of the capacitor 14, which contains a constant 15 and a variable 16 limiting resistors. The capacitor 14 and the winding of the electromagnetic vibrator 6 constitute the discharge circuit. Electromagnetic vibrator 6 connected with an thyristor converter 5.

Sensor 2 is mounted on a stationary base of an electromagnetic vibrator and is an LED 17 and a photodiode 18. Sensor 2 is connected to an amplifier 3, which contains a photocurrent amplifier 19, for example, with a pull-up resistor and a threshold 1 element 20. An amplifier 3 input through an inverter 21 and a pulse shaper 22, for example, a one-shot, and through a protective diode 23 is connected to the input of the thyristor converter 5, the output of thyristor npeo6pa30BaTejiH 5 is connected to the winding of the electromagnetic vibrator 6 oscillating mass. The puller of 22 pulses is connected through a voltage divider to the input of transistor 13. Parallel to the winding of the vibrator 6, a diode 24 is turned on opposite to the current flow,

Shaper 4 pulses contains RC-chain with variable resistor 25

To the oscillating mass by one

A plastic is attached. The second end of the plate is placed between the LED 17 and the photodiode 18. The plate is selected experimentally from the condition of periodic overlap of the light flux depending on the position of the oscillating mass. The sensor 2 and the plate together form a mass position sensor.

Power supply 1 connected

AC mains with a voltage of 220 V, and the sensor 2, the amplifier 3, the driver 4 pulses and the transistor 13 are powered low

constant voltage.

The winding of the vibrator 6 has a small number of turns and resistance, so that the impulse of current passing through the winding of the vibrator should be large.

amplitude and short. This is necessary for a smaller effect of the supply current on its own resonant frequency.

The proposed device works

in the following way.

The sensitivity of the amplifier 3 is adjusted by a trimmer resistor. RC circuit with resistor 25 sets a certain duration

pulse, which gives the pulse shaper 4.

Variable resistors 16 and 25 are tuned to the values at which the frequency reduction of the corresponding

There is a definite increase in amplitude (to maintain the performance constant). The capacitance of the capacitor 14 is selected depending on the power of the feeder,

Oscillation with the mass of the vibrator

occupies a position where the plate does not block the luminous flux from the LED 17 to the photodiode 18, Photocurrent opens the amplifier 3,

High potential at his exit

affects the imprinter 4 pulses, which produces a pulse of a certain duration (RC). This pulse through diode 23 is open

and a thyristor power amplifier 5. The discharge current of the capacitor 14 passes through the winding of the vibrator 6, the oscillating mass, as a result of which its position changes. In this case, the plate closes the luminous flux from the LED 17 to the photodiode 18. At the output of the amplifier 3, a low potential appears.

After the pulse on the pulse shaper 4, the transistors 13 and P are closed and the transistor 10 opens. The capacitor 14 begins to charge through resistors 15 and 16. The mass in the time that depends on its resonant frequency returns to its original position and the plate leaves the zone 17 Photo diode 18. At the output of the pulse driver 4, a new pulse appears which opens the transistors 13 and 11, and the transistor 10 closes it. The charge of the capacitor 14 stops. The voltage across the capacitor is set to i, (FIG. 3). One2079234

the thyristor converter 5 is temporarily opened. The process continues.

As the number of parts 5 loaded into the oscillating mass of the vibrator increases, the time for returning the oscillating mass to the initial position (,) increases. Since the pulse shaper 4 (FIG. 3) outputs 10 pulses of constant duration, the open time of the transistor switch 8 increases and the capacitor 14 is charged to a higher voltage U than at t. 15 Further, this voltage, acting on the winding of the vibrator 6, increases the amplitude of its oscillation. Productivity at the same time remains the same due to the fact that with decreasing frequency the amplitude increased by an appropriate amount.

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Editor M. Tsitkina

Compiled by I.Naarkin

Tehred 3.Paly Proofreader S.Cherni

Order 159/26 Circulation 833 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR CONTROLLING AN ELECTROMAGNETIC VIBRATOR, containing an oscillating mass position sensor, a power source, a thyristor converter, the output of which is connected to one end of the electromagnetic vibrator winding, which is exposed to the fact that, in order to ensure constant performance, it is equipped with a pulse shaper, a transistor switch and an RC circuit moreover, the position sensor of the oscillating mass is connected to the input of the pulse shaper, one output of which is connected to the input of the thyristor converter, and the other - with a transistor switch connected to a voltage source, the output of the transistor switch through an RC circuit is connected to one input of the vibrator, and the output of the thyristor converter is connected to another input of the vibrator. figure 1