SU362506A1 - DEVICE FOR AUTOMATIC PHASING OF THE ROTATING SHAFT OF A PHOTO TELEGRAPH APPARATUS - Google Patents

Description

The invention relates to the field of telemetry and communication and can be used in high-speed photo-telegraphic phasing devices.

Arrangements for the automatic phasing of a rotating shaft of a photo-telegraph apparatus, driven by a hysteresis synchronous motor, are known. The driver shaft rotates at a synchronous speed, and its motor is constantly powered by a synchronous frequency generator. The device compares the phase positions of the master and phased shafts at each revolution and feeds the synchronous motor of the phased shaft from two alternators switched as the phase shift decreases. The frequency of the motor power generators differs from synchronous by the value of Y 5%, where 6 is the specified phasing accuracy until the phase mismatch between the shafts becomes less than 1 /, 6%, and then by 5% until it becomes less than b%; thereafter, the motor of the phased shaft switches to constant power from the synchronous frequency source, and the shaft begins to rotate at a synchronous speed.

A disadvantage of the known devices is a relatively low phasing rate, which lasts for a given phasing accuracy b over 2 (1) / revolutions.

In order to increase the speed in the proposed device, Schmitt trigger outputs are connected to a frequency mixer, and the Schmitt trigger output signal of the synchronous frequency generator is fed to the input of the chain, which is connected in series with a key controlled by the signal of the motor phase pulse trigger, to which the key is connected controlled by the triggering signal of the phasing trigger, an additional key controlled by the triggering signal of the phasing trigger, and counter triggers whose outputs are connected to the block circuits anti-matches, to the second input of which through the second chain consisting of a serially connected key controlled by the signal of the phasing end trigger, the second auxiliary key controlled by the trigger signal of the phasing and triggers of the second counter, the signal from the frequency mixer is given, and the output of the last block circuit the anti-coincidence through the threshold switch on the third key, controlled by the trigger signal of the phase pulse of the engine, is connected to the trigger end of the phasing, while the outputs of the synchronous generators and the synchronous frequency connected to the corresponding parallel connected

synchronization path keys, to the control inputs of which signals are sent from the trigger end of the phasing.

The proposed device works as follows.

When you press the Reset button, the circuit is reset. The signal generator 7 synchronous frequency / i is supplied simultaneously to the inputs of the Schmitt trigger 2 and key 5, respectively. A square-shaped signal with a frequency fj from the output of a Schmitt trigger 2 simultaneously arrives at the inputs of the 4 frequency mixer, key 5 and key 6. The signal of the generator 7 of an asynchronous frequency fz simultaneously arrives at the inputs of the Schmitt trigger 8, key 9, then to the input of the synchronization path 10 and motor 11 phased shaft.

Thus, in the initial state, the phased shaft rotates at a synchronous speed. From the output of the Schmitt trigger 8, a square-wave signal with a frequency of / 2 is fed to another input of the 4-frequency mixer, at the output of which a difference-frequency signal fi / 2 is formed, which is fed to the inputs of keys 12 and 13.

The automatic phasing process starts when the Start Phasir button is pressed, while the pulses characterizing the phase position of the phased shaft from the output of the sensor 14 pulses arrive at the input of the trigger 15. The very first pulse entering the input of the trigger 15 closes it, causing the closed keys 6, 13, and 16 are opened, while the inputs of the trigger 17 of the counter 18 receive pulses with a frequency of / 1, and the input of the trigger, 19 of the counter 2 (with the frequency of / 1- / 2, both of the counters begin to fill. The incoming pulse ( PID) combined with the phase position authorizing the shaft enters through the switch 16 to the input of flip-flop 21 (open state) and changes it to the opposite closed.

Thus, the key 27 is open, and the key 5 is closed, the counter 18 stops the counting of pulses with a frequency of 1. Consequently, the difference in time between the phase positions of the master and phased shafts, expressed by the number of counted pulses a, is recorded.

The phased shaft rotates at an asynchronous speed and, due to the difference in speeds of the master and the phased shafts, their phase shift decreases. When the counter is counted 20 of a certain number of pulses (impulse b to impulse a), the phase shift between the master and phased shafts disappears, and

A negative pulse appears at the output of the anti-coincidence unit 23, and its amplitude is greater than the threshold threshold limit threshold 24. Pass the keys 24 and 22, this pulse is fed to the input of the trigger 25 and closes it. In this case, switches 3, 9 and 12 change their state to the opposite.

Therefore, the input of the synchronization path 10 receives a synchronous frequency signal

The / I, the motor // rotates at a synchronous speed, and the key 12 interrupts the arrival of pulses with the frequency / i- / 2 at the input of the counter 20.

Subject invention

A device for automatic phasing of a rotating shaft of a photo-telegraph apparatus containing synchronous generators

asynchronous frequencies, the outputs of which are connected to the corresponding Sh.mitt trigger, synchronization path of the phased shaft, the input of which includes two parallel-connected controlled keys, the motor of the phased shaft, pulse sensor, characterized in that, to improve speed, the Schmitt trigger outputs connected to a frequency mixer, in which the signal from the output of a Schmntt trigger of a synchronous frequency generator is supplied to the input of a chain consisting of a series-connected key controlled by a phase trigger signal a motor pulse, to the input of which is connected a key controlled by the triggering signal of the phasing, an additional key controlled by the triggering signal of the phasing, and counter triggers, the outputs of which are connected to the circuits of the antuncession block, to the second input of which through the second chain consisting of serially connected key controlled by the trigger signal of the end of phasing, the second auxiliary key controlled by the trigger signal of the start of the phasing of the triggers of the second counter; the frequency mixer, and the output of the last anti-coincidence block scheme through the threshold key and the third key controlled by the motor phase pulse trigger signal, connect the phase end trigger to the trigger, while the synchronous and asynchronous frequency generator outputs are connected to the corresponding parallel-connected synchronization path keys, pa control inputs

which signals are given from the trigger of the end of phasing.