| 摘要 |
<p>PURPOSE:To simplify the structure of a servo motor device by setting a potentiometer to the character that the resistance value of one end is abruptly increased and of the other end is abruptly decreased, thereby eliminating the addition of special mechanism for breaking the locking current of a servo motor. CONSTITUTION:When a setter 9 is set to a HOT side, the increase in the resistance value of a potentiometer 10 is accelerated when the opening of the damper becomes near 100% by the rotation of a servo motor 2, and the output level of a comparator 7 is abruptly decreased in response to the increase. Accordingly, the energization of the servo motor 2 is interrupted. When the setter 9 is then set to COOL side, the damper is approached to full closure by the rotation of the motor 2. Then, the resistance value of the potentiometer 10 abruptly decreases. Accordingly, the output level of a comparator 8 decreased in response to the decrease. Then, the collector current of a transistor 6 decreases, and when the voltage of a relay 4 becomes the operating voltage or lower, the contact is opened to break the energization of the motor 2.</p> |
