| 摘要 |
PURPOSE:To prevent uncomfortable shock sound from being generated without decreasing any opening or closing speed by a method wherein a supersonic motor driving door device is provided with an adjustment means for use in adjusting a contacted condition of a rotor of a supersonic motor for use in driving a door for its opening or closing and a controlling means for use in controlling its adjustment. CONSTITUTION:Since a clutch coil 88 is energized after starting a driving of a motor until a door is fully closed, a weak constant state is found between a rotor 80 and a resilient member 73 and a load is low, so that a rotational speed of the motor is fast and an operating speed of a door is fast. Then, as the door is approximately fully closed, a terminal 93 is moved away from it, so that an energization voltage of the clutch coil 88 is released, a contact pressure between the rotor 80 and the resilient member 73 becomes maximum and the number of revolution is decreased and at the same time a torque is increased. Accordingly, a speed of each of doors 4A and 4B striking against a wall of duct 5 is quite slow and no uncomfortable shock sound is generated. In addition, when fully closed, the door fully receives an air force applied by the motor, so that a load power is increased. However, since the clutch coil 88 is not energized just before fully closing the door, it is possible to increase the torque and close the door. |
