| 摘要 |
PURPOSE:To speedily bring the velocity of a carrier to a value approximate to a designated velocity and eliminates effects of variation in load, by varying a servo gain in servo control of the velocity of the carrier in accordance with the magnitude of the absolute value of a positional error. CONSTITUTION:An output signal from the second converter 14 indicative of the velocity of the carrier and a rotating direction signal J from a pulse- converting circuit 4 indicative of the moving direction of the carrier being moved are inputted into the second adder-subtractor 11, a designated velocity for the carrier is calculated, and is inputted into a coefficient setter 19. Based on the logic levels of signals from the first comparator 20 and the second comparator 21, the coefficient setter 19 determines a velocity error received from the second adder-subtractor 11, and the determined error is inputted into a D/A converter 15. Based on a digital signal inputted which also indicates the moving direction of the carrier, the converter 15 outputs an analog signal for a motor-driving current which signal also indicates the rotating direction of the motor 1, the analog signal is amplified by an amplifier 17, and the amplified signal is used to drive the motor 1. |
