JPS57153315A - Servo device - Google Patents

Abstract

PURPOSE:To decrease the number of transmission lines, by eliminating the need for an expensive converter, through the selection control of a rotating transformer type angle detector, a demodulation/voltage synthesizing circuit, and an angle selecting circuit. CONSTITUTION:Accelerating/reducing mechanisms 8a and 8b are set so that a rotor of a synchro transmitter 6 mechanically turns by one to one rotation, 360 deg., of a radar antenna 10. The rotor of the synchro transmitter turns by the same angle as the position of the radar antenna 10, an AC voltage is given to the srator winding corresponding to this angle and the voltage is inputted to a demodulation/voltage synthesizing circuit 12. A output voltage of the circuit 12 is applied to an angle selecting circuit 13. On the other hand, a signal of a reference angle Os is converted into a reference angle pulse train signal and a rotating reference signal at a pulse train conversion circuit 11 and outputted. This reference angle pulse train signal and the rotating reference signal are applied to a driving circuit of the circuit 13. In the figure, a servo circuit is shown as number 5, a motor as 9 and a smoothing circuit as 14, respectively. Thus, an inexpensive device is established, the number of transmission lines can be decreased and the length can be made limitless.