| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric shutter overload detection device capable of surely and inexpensively detecting an overload state of the electric motor by simply controlling in a shutter device making use of the electric motor. SOLUTION: The electric shutter overload detection device is so constituted that even if a factor enabling the revolution- speed of a DC motor to fluctuate occurs, a constant speed controlling means maintaining the revolution-speed in winding up or down by controlling a driving current of the DC motor, a positional detection means organizing position information regarding to a winding up position or a winding down position of a shutter curtain, a load detection means organizing load information regarding to a load state of the DC motor by finding a current value of the driving current, the load information is memorized in relation with the positional information and, at the same time, a load storage means which the load information corresponding to the memorized positional information referred in an operating state of the electric shutter device are included. COPYRIGHT: (C)2007,JPO&INPIT
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