ROBERT M GAMBER
Engineering in Roanoke, VA
License number
Pennsylvania ET016736
Category
Engineers
Type
Engineer in Training
Address
Address
2
Roanoke, VA 24018
Pennsylvania
Pennsylvania
Professional information
Product Manager At Ge
Position:
Product Manager at GE
Location:
Roanoke, Virginia Area
Industry:
Electrical/Electronic Manufacturing
Work:
GE
-
Product Manager
Education:
United States Merchant Marine Academy 1980 - 1984
Robert Gamber
Location:
Roanoke, Virginia Area
Industry:
Electrical/Electronic Manufacturing
Robert Gamber
Location:
Roanoke, Virginia Area
Industry:
Consumer Goods
Ground Fault Detection And Protection Method For A Variable Speed Ac Electric Motor
US Patent:
5945802, Aug 31, 1999
Filed:
Nov 7, 1997
Appl. No.:
8/966289
Inventors:
Charles E. Konrad - Roanoke VA
Robert M. Gamber - Roanoke VA
Massimo Polo - Preganziol, IT
Robert M. Gamber - Roanoke VA
Massimo Polo - Preganziol, IT
Assignee:
General Electric Company - Schenectady NY
International Classification:
H02P 540
US Classification:
318807
Abstract:
A method and apparatus for detecting the presence of a ground leakage path in an electric motor system including an alternating current (ac) electric motor coupled for receiving electric power from a switching inverter of the type having, for each phase of the motor, a pair of serially connected electronic switching devices connected between relatively positive and negative direct current (dc) voltage buses with the switching devices being alternately gated into and out of conduction for providing switched electric power to the motor. The inverter includes a current detector for detecting current in the relatively negative voltage bus. The method comprises initially applying a gating pulse each time the motor is energized to the switching device of each phase connected to the negative voltage bus and identifying a ground leakage path when such gating pulse produces current at the current detector. Preferably, the first gating pulse is of very short time duration and the process of applying gating pulses is repeated for each of a plurality of continuously increasing pulse widths until a selected maximum width is attained without generating current. Thereafter, the motor is started in a conventional manner.
Method And Apparatus For Controlling Operation Of A Submersible Pump
US Patent:
6254353, Jul 3, 2001
Filed:
Sep 14, 1999
Appl. No.:
9/395634
Inventors:
Massimo Polo - Preganziol, IT
Stefano Cavagna - Belluno, IT
Robert M. Gamber - Roanoke VA
Charles E. Konrad - Roanoke VA
Stefano Cavagna - Belluno, IT
Robert M. Gamber - Roanoke VA
Charles E. Konrad - Roanoke VA
Assignee:
General Electric Company - Schenectady NY
International Classification:
F04B 4906
US Classification:
417 4411
Abstract:
A submersible pumping system which, in one embodiment, includes a motor, a pump and a control circuit, or unit, coupled to the motor for controlling the operation of the motor is described. Using motor and sensor signals, the control unit detects various conditions within the pumping system and alters motor operation. In an exemplary embodiment, the control unit initiates an oscillation sequence of applying a forward torque for a first preselected period of time, applying a reverse torque for a second preselected period of time, and then repeating the torque applying steps a selected number of times to eliminate an obstruction from the pump.