| 摘要 |
PURPOSE:To control each motor with a single control command when tables are driven as an integral unit, by connectably forming the plural tables and correcting the shifting between driving currents of the motors driving each table. CONSTITUTION:In case of connectively driving tables 4a, 4b, the both tables are connected by a connecting means 9 to output a control pulse PC1 of each motor 3a, 3b from a selector circuit 13. While a characteristic difference between the motors 3a, 3b and response characteristic differenc between servo systems are caught as the shifting of a driving current of each motor and displayed as an output of a correction circuit 10. Further a speed deviation signal is additionally considered to obtain a correction signal and input to a speed control circuit 2b, and the motors 3a, 3b are controlled so as to obtain a zero difference between their driving currents. In this way, applied torque to the both motors 3a,3b is equalized also the driving current is equalized thus the tables 4a, 4b can be smoothly moved as an integral unit. |
