Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-03-13
2007-03-13
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S098000, C318S071000, C318S432000, C212S171000, C212S173000
Reexamination Certificate
active
10643161
ABSTRACT:
Included herein is a system and method for controlling a velocity vector of an overhead crane. A motor is attached to the crane and is positioned to move the overhead crane and has an output vector including a rotational direction and a rotational speed. A variable frequency drive is positioned to transfer voltage and current at a frequency to the motor. A processing unit converts the output vector to an amount of voltage and current at a given frequency and can instruct the variable frequency drive to send a frequency to the motor at a frequency substantially equal to the frequency at which the motor is presently rotating. This creates a speed match for the motor reducing spikes during operation of the motor and substantially eliminates open circuit decay. A hydraulic brake operates in connection with the processing unit and the variable frequency drive to slow the crane without driving the motor into the brake.
REFERENCES:
patent: 4965847 (1990-10-01), Jurkowski et al.
patent: 5167401 (1992-12-01), James et al.
patent: 5210473 (1993-05-01), Backstrand
patent: 5294066 (1994-03-01), Lacour
patent: 5319292 (1994-06-01), Backstrand
patent: 5343134 (1994-08-01), Wendt et al.
patent: 5548198 (1996-08-01), Backstrand
patent: 5625262 (1997-04-01), Lapota
patent: 5866997 (1999-02-01), Sorsa et al.
patent: 5941305 (1999-08-01), Thrasher et al.
patent: 6041856 (2000-03-01), Thrasher et al.
patent: 6131557 (2000-10-01), Watson
patent: 6417644 (2002-07-01), Hammond et al.
patent: 6463812 (2002-10-01), Dubois
patent: RE37976 (2003-02-01), Hiramatsu
patent: 6564548 (2003-05-01), Nishimura et al.
patent: 6720751 (2004-04-01), Plasz et al.
patent: 2002/0033481 (2002-03-01), Kemppainen
patent: 491 200 (1992-06-01), None
Colon Santana Eduardo
Donovan Lincoln
Magnetek Inc.
Waddy & Patterson, P.C.
Walker Phillip E.
LandOfFree
Control system and method for an overhead bridge crane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system and method for an overhead bridge crane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system and method for an overhead bridge crane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3740319