Fan controller for reducing harmonic fluxuations that produces a

Details Fan controller for reducing harmonic fluxuations that produces a Fan controller for reducing harmonic fluxuations that produces a

1997-08-07

2000-01-04

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 22, F04B 4906

Patent

active

060103108

ABSTRACT:
A motor speed controller for a shaded pole ceiling fan motor having low audible noise, includes a burst period generator for generating gating signals of a duration varying between a preselected minimum equal to at least one wavelength of an AC drive signal to the motor, and a maximum equal to a large number of wavelengths, and a controlled switch such as a triac, connected between the power source and fan motor, and having a gate terminal connected to the burst period generator.

REFERENCES:
patent: 3761792 (1973-09-01), Witney et al.
patent: 4358730 (1982-11-01), Beifus
patent: 4388578 (1983-06-01), Green et al.
patent: 4499408 (1985-02-01), Bitting et al.
patent: 4935736 (1990-06-01), Meierdierck
patent: 5019717 (1991-05-01), McCurry et al.
patent: 5479557 (1995-12-01), Ganz et al.

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