| 摘要 |
PURPOSE:To continue the rotation of a step motor by gradually rotating the motor from a self-starting frequency when the motor stops due to an impact or a vibration, thereby automatically restarting the motor. CONSTITUTION:Assume that an overload occurs in a motor due to an impact or a vibration and the motor is decelerated or stopped. As a result, the output VFS of a frequency/voltage converter 6 becomes a reference voltage Vr or lower, the output of a first comparator 7 becomes a high level, a signal is output through an RS flip-flop 9 from a logic circuit 8, and a switch 11 is set to a set S side. As a result, a voltage VFin once becomes zero potential, and the voltage is raised at the time constant of RC. Accordingly, a step motor 4 can start gradually rotating from a self-starting frequency. |
