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1. (WO2001038794) MOTOR STEP-LESS SPEED CONTROL WITH ACTIVE FEEDBACK OF PHASE DETECTOR

Pub. No.:    WO/2001/038794    International Application No.:    PCT/US2000/032508
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Thu Nov 30 00:59:59 CET 2000
IPC: F23N 3/08
F23N 5/10
Applicants: HONEYWELL INTERNATIONAL INC.
Inventors: BIRD, Douglas, D.
BRENT, Chian
Title: MOTOR STEP-LESS SPEED CONTROL WITH ACTIVE FEEDBACK OF PHASE DETECTOR
Abstract:
An apparatus for and method of controlling the circulating fan of a gas appliance. The circulating fan is powered by an alternating current electric motor. An electronic circuit, powered by the heat of the gas appliance, determines the rotational speed of the electric motor by controlling the effective duty cycle of the alternating current source coupled to the electric motor.