| 摘要 |
A DC to DC sine/cosine positioning servo system has an electro-mechanical DC to AC converter. The latter includes a DC torquer, having a rotor with respective windings for receiving two DC input signals proportional to the error signals detected. Mechanial movement of the rotor is proportional to the relative values of the two input signals. The rotor of a synchro control transmitter is mechanically coupled to the rotor of the DC torquer. A reference oscillator is provided which produces an AC output voltage at a predetermined frequency. The oscillator output is connected to the rotor of the control transmitter. The stator windings of the control transmitter are connected to the stator windings of a control transformer. The rotor of the control transformer produces an output voltage directly proportional to the relative angle between the rotor of the control transformer and the stator windings. The output voltage of the rotor is compared to the output voltage of the reference oscillator in an AC to DC converter. The latter produces a DC output signal proportional to the control transformer rotor voltage and which drives a DC motor for positioning the system to a null. The system described can be used in a single speed servo system or in a fine and coarse, two speed servo system with appropriate gearing and signal sampling between the control transformers of each of the two systems.
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