Personal air sampler with electric motor driven by intermittent

Details Personal air sampler with electric motor driven by intermittent Personal air sampler with electric motor driven by intermittent

1980-04-18

1981-09-29

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345CA, 318490, 318459, H02P 516

Patent

active

042925746

ABSTRACT:
Constant selected speed running of an electric motor, with a varying mechanical load, is achieved by intermittently pulsing the motor at full power and comparing the back EMF of the motor, between power pulses, with a selected speed voltage, to accordingly control application of the power pulses. A particular control circuit is disclosed which permits operation of a pocket-sized system, powered by a three cell battery, to achieve substantially constant speed, at normally varying loads, throughout a ten hour period, with back EMFs at selected values between 0.01 volt (motor barely turning) and 2.0 volts (high speed). The system is useful in a personal air sampler, used to monitor a workman's exposure to noxious ingredients of breathing air.

REFERENCES:
patent: 3624474 (1971-11-01), Nolf
patent: 3683253 (1972-08-01), Rummel et al.
patent: 3803470 (1974-04-01), Vosteen
patent: 3997869 (1976-12-01), Mayer

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