Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2008-04-15
2008-04-15
Sherry, Michael (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
Reexamination Certificate
active
10618265
ABSTRACT:
There is described a method for controlling an electric motor comprising an operating relay having relay windings with respective first and second relay contacts and a control means, which motor via current conductors is connected to said relay and a power source wherein an operator by using said control means controls the application of current to the motor armature or rotor and field coil(s) or field magnet(s), monitoring devices are provided which sense indicating parameters that are compared with respective corresponding reference values in a safety function unit in order to determine whether the contacts of the operating relay are mistakenly in the on position, and if one of the contacts is the on position, ensures the switching on of at least the other one of the relay contacts so that the current application to the motor is interrupted and the motor stops. There is also described a control system for an electric motor, wherein sensors/sensing means are provided arranged at suitable measuring points in the system or motor circuit connected to the safety function unit and arranged so that when there is no control signal to the relays, the contacts of both relays are energized and the motor stops.
REFERENCES:
patent: 3656023 (1972-04-01), Hadfield
patent: 3671834 (1972-06-01), Buckeridge
patent: 3898527 (1975-08-01), Cawley
patent: 3911341 (1975-10-01), Carlson et al.
patent: 4027202 (1977-05-01), Tyler et al.
patent: 4151575 (1979-04-01), Hogue
patent: 4389692 (1983-06-01), Sander et al.
patent: 4477753 (1984-10-01), Ratzel et al.
patent: 4638850 (1987-01-01), Newell et al.
patent: 4942346 (1990-07-01), Ardit et al.
patent: 4972133 (1990-11-01), Hirota et al.
patent: 5128500 (1992-07-01), Hirschfeld
patent: 5189412 (1993-02-01), Mehta et al.
patent: 5661625 (1997-08-01), Yang
patent: 6169648 (2001-01-01), Denvir et al.
patent: 6234100 (2001-05-01), Fadeley et al.
patent: 6570272 (2003-05-01), Dickhoff
patent: 6657833 (2003-12-01), Matsuki et al.
patent: 0 651 489 (1995-05-01), None
patent: 1 523 599 (1978-09-01), None
patent: 2216726 (1990-08-01), None
patent: 5049314 (1993-03-01), None
patent: 10145909 (1998-05-01), None
Hoang Ann T.
Lipsitz & McAllister LLC
Sherry Michael
Sleipner Motor AS
LandOfFree
Method and control system for controlling electric motors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and control system for controlling electric motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and control system for controlling electric motors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3941647