Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Reexamination Certificate
2005-09-30
2008-05-13
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
C318S272000, C318S286000, C318S459000, C318S469000, C388S928100
Reexamination Certificate
active
07372224
ABSTRACT:
A barrier operator comprises a first measuring apparatus for measuring a current used by a direct current (dc) motor to move a barrier and a second measuring apparatus for measuring a generated voltage of the dc motor. A controller is coupled to the first measuring apparatus and the second measuring apparatus. The controller is programmed to calculate a torque of the dc motor by using the current and to determine when an obstruction exists in the path of the barrier based upon the calculated torque.
REFERENCES:
patent: 3568027 (1971-03-01), Bacon et al.
patent: 4510423 (1985-04-01), Iwasawa
patent: 4675586 (1987-06-01), Eigner et al.
patent: 5448149 (1995-09-01), Ehsani et al.
patent: 5811947 (1998-09-01), Hurst et al.
patent: 5838126 (1998-11-01), Llerena
patent: 5977732 (1999-11-01), Matsumoto
patent: 6411873 (2002-06-01), Rogovin
patent: 6838847 (2005-01-01), Dragoi et al.
patent: 6906487 (2005-06-01), de Frutos
patent: 2003/0103306 (2003-06-01), Nakazawa et al.
patent: 2003/0137265 (2003-07-01), de Frutos
patent: 1 158 642 (2001-11-01), None
patent: 2 282 639 (1995-04-01), None
patent: 2 287 369 (1995-09-01), None
patent: WO 85/01773 (1985-04-01), None
Fitch Even Tabin & Flannery
Ro Bentsu
The Chamberlain Group, Inc.
LandOfFree
System and method for determining barrier motor parameters... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for determining barrier motor parameters..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for determining barrier motor parameters... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3983766