Electromechanical Compensating Device and It's Characteristics in AC Control System

Abstract

The control systems are classified into two large groups, that is, DC control systems and AC control systems. On the other hand, the compensating circuits adopted to these control systems are grouped into three classes, the phase lead, the phase lag, and the phase lag-lead circuit.
In general, these compensating circuits consist of several resistors and capacitors, but the rotating machines are used for this purpose in our seminar for the past ten years. One of the compensating devices to the DC control system consists of a resistor and a separately excited DC motor, and the other consists of a separately excited DC generator and a potentiometer.
On the above mentioned DC compensating devices, various papers on their principles and dynamic characteristics by us. were published some years ago describing.
And so, in this paper the principle, the characteristics, and it's analysis of the AC compensating device, which consist of a two-phase servomotor and a two-phase rate generator were described.
The merits of this device are as follows;
1) Because of the large time constant of the two-phase servomotor, it can be used as the phase shifter for super-low frequency, and the time constant of the two-phase servomotor can be increased by adding the other moment of inertia.
2) In the compensating circuit using resistors and capacitors, the phase of carrier signal varies according to it, but there is no phase shift of the carrier signal in this compensating device.
3) If we use large output two-phase rate generator, we can pick up the large power signal out of it, without the amplifier.