Method of controlling air flow rate of fan

Details Method of controlling air flow rate of fan Method of controlling air flow rate of fan

1982-11-29

1984-08-28

Freeh, William L.

Pumps

Processes

417 17, 417 20, F04B 4906, F04B 4900

Patent

active

044681712

ABSTRACT:
The air flow rate of a fan driven by a motor controlled by an adjustable speed control equipment is automatically controlled by stopping the adjustable speed control equipment in response to a fault signal therefrom during operation with an inlet vane installed upstream of the fan in fully open state, simultaneously throttling the inlet vane at a preset speed to a degree of opening appropriate for the load by means of a control circuit, and, after a period for reduction of residual voltage of the motor, changing over to operation of the fan by a commercial power supply thereby to shift to control by the degree of opening of the inlet vane.

REFERENCES:
patent: 4225289 (1980-09-01), Borkett
patent: 4255089 (1981-03-01), Phillips
patent: 4370098 (1983-01-01), McClain

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