| 摘要 |
PURPOSE:To improve control characteristics in revolution at a low speed by a system wherein two synchronous signal generators are mounted to a servomotor, an inside servo-closing circuit is formed by means of the first generator and an outside servo-closing circuit is made up by means of the second generator. CONSTITUTION:An inside servo-closing circuit 101 is built up in such a manner that input signals A are input to a phase comparator 5, and converted into AC voltage by means of a signal converter 17, and a servomotor 10 is driven while the output of the first generator 7 between two synchronous signal generators directly coupled with the motor 10 is supplied to the other terminal of the phase comparator 5. Meanwhile, the second generator 11 is fed to a phase comparator 1 with the signals B of another motor, and forms an outside servo-closing circuit 102 through a voltage control oscillator 3, and the input signals A are generated. Thus, since phase constraint loop circuits are used in double, the revolution of a motor rotating at a low speed can be controlled extending over a wide range while follow-up properties can be improved. |
