SU399989A1 - DEVICE FOR SYNCHRONIZATION OF ROTATION FREQUENCY OF THE ELECTRIC MOTOR - Google Patents

Description

one

The invention relates to devices for synchronizing the rotation of an electric motor with a frequency of a master frequency source.

Devices for synchronizing the rotational speed of an electric motor are known, containing a master frequency source, a trigger and a feedback sensor connected to the first trigger input, the second input of which is connected to the master frequency source and the output to the motor.

The proposed device is characterized in that it contains n additional triggers with memory, the first inputs of which are connected to the feedback sensor, the second to the master frequency source, and the outputs to the electric motor.

This improves the dynamic characteristics of the device and eliminates dips at multiple frequencies.

The drawing shows a diagram of a device for synchronizing a rotational frequency, a frequency-phase device (FFC) made of two parallel-switched flip-flops Tr1 and Tr2, each of which consists of series-connected thyristors D and a transistor T. the actuator element of the IE and the source of the And frequency.

At the moment of switching on, one of the transistors T opens, and the synchro impulse arriving at the thyristors of the frequency-phase device opens only the one with the prepared circuit, i.e. the transistor. The circuit is closed. and the supply voltage is applied to the input of the actuator. The circuit will be over-closed. Until the signal from the DOS feedback sensor closes the transistor and opens the circuit. Since the time of the open and closed state of the transistors is determined by the signal from the feedback sensor, then with two triggers connected in parallel, the open state of the transistor should be at least 1/2 period, and with parallel triggers not less than / p.

Thus, each subsequent trigger will be prepared, and upon arrival of the sync pulse the circuit closes, which will ensure further acceleration of the engine until the frequency of the sync pulses does not coincide with the frequency of the feedback sensor. Synchronization will occur. The average value of the example ;; the grooming supplied to the actuator in synchronous mode may vary depending on the phase in the range from 0 to t / niiT. In the steady state, the average value of the nanr is automatically set; wives, ensuring rotation at a time of synchronous speed. As the rotational speed increases, the frequency of the feedback sensor signal exceeds the synchronous one, and the frequency-phase device reduces the average voltage value (relative duration of voltage pulses applied to the actuator). The speed of the motor decreases to synchronous. When the speed decreases relative to the synchronous, the average value of the voltage increases and the system returns to its original position.

Subject invention

A device for synchronizing the frequency of the motor, containing, sets the frequency source, the trigger and the feedback sensor connected to the first trigger input, the second input of which is connected to the master frequency source, and the output to the motor, characterized in that In order to improve the dynamic characteristics of the device and eliminate dips at multiple frequencies, the device contains n additional triggers, the first inputs of which are connected to the feedback sensor, the second to the master frequency source, and outputs to the electric motor.