| 摘要 |
PURPOSE:To control to more suitably feed a wire by braking a motor when the speed of the motor exceeds a set amount. CONSTITUTION:When the speed V of a motor 2 is lower than a set amount, an operation signal E becomes positive, and a code signal SS becomes ''L'' level. Accordingly, SW1 driver 27 turns ON a switch SW1 in case of TW<DELTAE, and OFF in case of TW>DELTAE. On the other hand, when the speed V of the motor 2 exceeds the set amount, the signal DELTAE becomes negative, and the signal SS becomes ''H''. Accordingly, a SW2 driver 27 turns ON a switch SW2 in case of signal TW>DELTAE and OFF in case of TW<DELTAE. When the SW2 becomes ON, the counterelectromotive force EM of the motor 2 flows in the circuit of a terminal 2a, a reactor 3, the switch SW 2 and a terminal 2b, thereby braking the motor 2. |
