Electric tightening device

Details Electric tightening device Electric tightening device

2006-11-14

2006-11-14

Ro, Bentsu (Department: 2837)

Electrical transmission or interconnection systems

Miscellaneous systems

Power packs

C388S937000, C320S134000, C320S148000, C320S149000

Reexamination Certificate

active

07135791

ABSTRACT:
A controller compares a minimum value of power source voltage which decreases in association with starting current generated upon start of a motor with a threshold value in a storing unit. When the minimum value is less than the threshold value, the controller notifies of shortage of the power source terminal voltage, and stops the motor. The controller also compares a value obtained by integrating the power source voltage which decreases in association with starting current generated upon start of the motor for only predetermined time with the threshold value in the storing unit, when the integral value is less than the threshold value, notifies of shortage of the power source terminal voltage, and stops the motor.

REFERENCES:
patent: 4714868 (1987-12-01), Maruyama et al.
patent: 5144248 (1992-09-01), Alexandres et al.
patent: 5357203 (1994-10-01), Landau et al.
patent: 5451881 (1995-09-01), Finger
patent: 6765317 (2004-07-01), Chu
patent: 6771043 (2004-08-01), Matsunaga et al.
patent: 6847191 (2005-01-01), Wang
patent: A-2000-117649 (2000-04-01), None

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