Rotation-supervised d-c fan or blower system

Details Rotation-supervised d-c fan or blower system Rotation-supervised d-c fan or blower system

1976-04-19

1978-06-27

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Speed or rate-of-movement

318331, H02H 708

Patent

active

040977897

ABSTRACT:
An evaluation circuit, sensitive of the frequency of an applied signal, is connected to the motor to sense the a-c component of the pulsating current flow through the motor, the evaluation circuit preferably including a filter matched to the frequency of the a-c component at operating speed to enhance the a-c component at operating speed or speed range with respect to other frequencies. The signal is taken across an impedance element connected in series with the motor and motor supply circuit, which may be a transformer or a low-value resistor, to provide an output voltage signal of a magnitude sufficient to unambiguously control a transistor amplifier, for example in the order of 0.1 V.

REFERENCES:
patent: 2989678 (1961-06-01), Swartout
patent: 3079523 (1963-02-01), Thienlf
patent: 3149243 (1964-09-01), Garfield
patent: 3617836 (1971-11-01), Henry
patent: 3705337 (1972-12-01), Grabl
patent: 3809975 (1974-05-01), Bartels
patent: 3868521 (1975-02-01), Schlicker

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