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.
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.
JP2002194973A | 2002-07-10 | |||
JP2001231282A | 2001-08-24 | |||
JPH1037637A | 1998-02-10 | |||
JP2001245490A | 2001-09-07 | |||
JPH0525982A | 1993-02-02 | |||
JP2004027589A | 2004-01-29 | |||
JPH06137027A | 1994-05-17 |
Susumu Ohata
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