Patent ID: 6133699
Filing Date: 2000-10-17
Classification: H02P

Abstract:
A system for operating a plurality of motors of a standard furnace with a single controller, said system comprising:a first motor, wherein the first motor is positioned in the standard furnace so as to force air throughout at least one duct of the standard furnace;a second motor, wherein the second motor is positioned in the standard furnace so as to remove exhaust gases from the furnace, the second motor being matched to the first motor and having a lower power rating than the first motor, wherein when activated, the second motor and the first motor rotate at substantially the same speed; anda controller supplying the first and second motors in parallel with a single constant frequency voltage signal selected from one or more frequencies over a complete range of frequencies, the frequency of the single constant frequency voltage signal being proportional to a desired speed for both the first and second motors;wherein the first and second motors perform work at substantially the same speed, when both are activated.