MOVEMENT OBSTRUCTION DETECTOR FOR DOOR AND DOOR AUTOMATIC OPEN-CLOSE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a movement obstruction detector for a door capable of accurately detecting an obstruction by an obstacle or the like of the open-close operation of the door and a door automatic open-close device. SOLUTION: The door is opened and closed by an electric motor 81. When the door is opened and closed, a motor control section 220 rotates and drives the electric motor 81 according to a fixed control pattern. A rotation detector 81a and a rotational-speed arithmetic section 240 detect the actual rotational speed of the electric motor 81, and a comparison decision section 230 decides whether or not the open-close operation of the door is obstructed from the difference of detected actual rotational speed and specified rotational speed at a current time of the electric motor 81 based on the control pattern.