Electric motor controlling method for roller shutter in department store, involves automatically determining extreme position from number of stop of electric motor to automatically evaluate reference position that is utilized later

摘要

The method involves utilizing a time measurement counter that is associated to displacement of a mobile wall, and a program triggering stopping of an electric motor when overtorque of the motor is detected by an overtorque detection unit. Stopping of the motor is monitored for each displacement direction by detection of the overtorque, and a value of the counter and position of the mobile wall are stored in a memory. An extreme position is automatically determined from number of stop due to the overtorque to automatically evaluate a reference position that is utilized later.