| 摘要 |
<p>PURPOSE:To prevent greater current flowing to the motor transiently, by interrupting the power supply to the motor for a given time at the selection of direction of revolution. CONSTITUTION:The monostable multi-circuit 11 triggered with the selection timing of the direction of revolution selection switch S3 of the motor M is provided, and it is connected to the motor M via the AND circuits 12, 13 and transistors Tr2, Tr3. Thus, the switch S3 is connected to the contact a3, high level signal is outputted from the monostable multivibrator circuit 11, AND condition of the AND circuit 13 is established to conduct the transistors Tr3, Tr4, and when a current flows to the motor M toward the arrow A to turn and the switch S3 is selected to the contact b3, then the monostable multivibrator circuit 11 is operated and low level signal is outputted for a given time, AND condition of the AND circuits 12 and 13 are both not established, the transistors Tr3-Tr5 are not conducted to interrupt the power supply to the motor M for a given time and the motor M is decelerated or stopped.</p> |
