SU369508A1 - DEVICE FOR MONITORING FREQUENCY DEFLECTION - Google Patents

Description

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The proposed device relates to the field of automation and can be used in the control and regulation systems for determining the magnitude and sign of the deviation of the controlled frequency - from the reference frequency range.

There are known frequency deviating control devices containing two tracer transformers, each of which one is made on a core of a hard magnetic material, and the other is made of a soft magnetic material with windings of controlled reference and output frequencies.

However, the known devices have a large h; the number of elements are complex and have a low; hope (no.

In addition, they "have separate outputs for the magnitude and ziak of the frequency deviation from the specified range.

In order to obtain the absolute value and the sign of the controlled frequency deviation from the specified range while increasing the reliability of 1V, the proposed device introduced an additional transformer on a core made of soft material, having two input and one output windings, and the windings of the reference frequencies of each transformer pair are connected in series and connected .to the inputs of the corresponding reference frequency buses, the windings of the monitored frequency of both pairs of transformers are connected in accordance with and yucheny to the input ui: ine controlled frequency output windings of each pair

the transformers are connected in series and in opposite directions. And through the diodes they are connected to the corresponding input windings of an additional transformer, the output winding of which is the output of the device.

Pa figs. I is a schematic diagram of the proposed device; in fig. 2 shows the frequency ratios of the output signals for transformers.

Transformers 1, 2 and 3 have cores of magnet of a soft material, transformers 4 and 5 - cores of a hard magnetic material. Pulses / g and ff of the reference frequencies are supplied to the input terminals b and 7, respectively, and pulse fx to the input terminal 8, at a controlled frequency, while the output of the controlled frequency is outside the range limited by the reference frequencies (t, e

with /. On the output terminal 9, a signal appears whose frequency is proportional to the absolute value of the controlled frequency deviation from the specified range, and the polarity of the output signal indicates the sign of the deviation. Under the frequency follows

understand the number of pulses per unit of time.

When the ratio at terminal 9 is reached, the signal "e occurs.

The proposed device works as follows.

When applying the successive input signals of the pulses / 6 and / IB, the output windings 10 of the transformer 1 induce ed pulses. with. of the same amplitude but of opposite polarity. When applying the same pulses (a or /) to the output winding 10, pulses of the same amplitude and polarity are also induced. In transformer 4, the current turns for the input signals are chosen so that the ori alternating passage of pulses / e and / f the core is re-magnetized from one state to another (from "About lv 1" and vice versa), as a result of which in the output winding 10 h. d. with. If the input signal is preceded by a signal of the same name, the core 4 is not magnetised.

The parameters of the Cores and the turns of the windings of transformers 1 n 4 are chosen so that the amplitudes and durations of the signals induced in the output windings of both transformers are the same for the case of magnetic reversal of the transformer core 4. Since the output windings 10 and 11 of the transformers / and 4 are respectively included opposite , the signal taken from the output windings 10 and 11 of the transformers 1 to 4 is equal to the difference e. D. s., induced in the thirst of the output windings 10 and 11 of these transformers.

Therefore, the re-shaping of the transformer core 4 (the output signal of this pair of transformers 1 n 4 is almost zero, and in the absence of magnetisation, the output voltage induced in the output winding 10 of the transformer).

The parameters of the cores and the ratio of turns of the windings of another pair of transformers 2 and 5 are selected in a similar way.

Three cases of the ratio of the input signals for a pair of transformers 1 and 4 are possible: fe.; . (Fig. 2), where / 6 is the input frequency reference signal; / W-input signal controlled frequency; UQ - EMF, induced in the output

winding 10 transformer 1; Ue-emf., Induced in the output

winding 11 transformer 4; Ue- (resultant voltage eds of the output windings 10 and 11 of a pair of transformers 1 n 4.

Under the action of the input pulse 12 in the output windings 10 and // transformers / and 4 pulses 13 and 14 are induced.

Since the output windings of 10 and 11 pairs of transformers 1 are switched in opposite, the resulting emf. t / e is zero.

Under the action of the input pulse 15 in the output windings 10 and 11, mutually compensating pulses 16 and 17 are induced.

When the resulting emf. Ue for

a pair of transformers / and 4 is equal to "hoot. Suppose that pulse 18 is preceded by a pulse fx, then under the action of the input pulse 18 in the output windings 10 and 11 of transformers 1 to 4 pulses 19 and 20j are induced and the resulting ed. with. Ue is zero. As a result of the action of the impulse 21 resultant emf. Ug is also zero. Since, it can be assumed that a pulse 22 will follow, under the action of which a pulse 23 appears in the output winding 10 of transformer 1, and in the output winding 11 of transformer 4 em. It is not induced, because under the action of two pulses of the same name following one after the other, the core of the transformer 4, which is made on a hard magnetic material, cannot be re-magnetized twice.

Under the action of impulse 22, a resultant impulse 24 arises. When a resultant sequence of impulses of positive polarity with frequency (fx -fe) occurs.

When the resulting emf. Ue has

Q is negative polarity, and the frequency of the resulting sequence is (/ e - fx). For a pair of transformers 2 and 5, similar reasoning can be made. Since the circuit consisting of the output windings 10 and 11 of transformers 1 and 4 and the input winding 25 of transformer 3 includes a diode 26, then under the action of the resulting emf. UB of positive polarity, the current in this circuit does not flow. Under the action of the resulting emf. Ue of negative polarity a current passes through the winding 27 of transformer 3, and a negative impulse occurs at the output terminal 1 of terminal 9. The frequency of the sequence of these pulses is (fe - fx).

5 In the circuit consisting of the output windings 28 and 29, the transformers 2 and 5 of the input winding 30, the transformer 3 and the diode 31, the current flows only at, which causes a positive pulse to the output

0 to terminal 9. The frequency of these pulses is (fx - h).

Subject invention

A device for controlling frequency deviation, containing two pairs of transformers, in each of which one is made on a core of magnetically hard, and the other is made of magnetically soft Materials with windings of controlled reference and output frequencies, in order to obtain an absolute the magnitude and sign of the deviation of the monitored frequency from the specified range while increasing the reliability of the device, an additional transformer on it has been added to a serie made of a magnetically soft material, having two input and one output coils, wherein the windings of each pair of reference frequency transformers Cpd "enes and lyudklyucheny sequentially according to the inputs of respective tires reference frequency, the frequency controlled winding of both transformers are connected in series pairs and according

connected to the input bus of the controlled frequency, output;: the windings of each pair of tractors: the transformers are connected in series to each other and connected via diodes to the corresponding input windings of the auxiliary transformer, the output winding of which is the device output.

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