Terry Q Webb

US Patent:

62279610, May 8, 2001

Filed:

Jan 14, 1999

Appl. No.:

9/231050

Inventors:

Scott W. Moore - Arlington Heights IL
Terry L. Webb - Roanoke VA
Michael C. Brown - Salem VA

Assignee:

General Electric Company - Schenectady NY

International Classification:

F24F 1104

US Classification:

454229

Abstract:

A fan control system suitable for use in air moving applications has a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure. A supply air flow sensor is responsive to an air flow in a supply air duct and supplies a supply air flow signal representative of the air flow in the supply air duct. A return air flow sensor is responsive to an air flow in a return air duct and supplies a return air flow signal representative of the air flow in the return air duct. A supply fan moves air in the supply air duct. The supply fan is driven by a supply fan motor. A return fan moves air in the return air duct. The return fan is driven by a return fan motor. A unitary volumetric air flow controller is connected to the supply fan motor and to the return fan motor. The air flow controller selectively applies a supply drive power signal to the supply fan motor to energize the supply fan motor, and selectively applies a return drive signal to the return fan motor to energize the return fan motor.