Control system for battery-operated pump

Details Control system for battery-operated pump Control system for battery-operated pump

1979-04-06

1980-12-23

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

318331, 318341, H02P 308

Patent

active

042412994

ABSTRACT:
A motor control system, particularly adapted for use with a battery-operated atmospheric hazard sampling pump, which can vary motor speed over a range of 50:1 with the use of a voltage controlled pulse width modulator. The system includes a back EMF circuit which develops a voltage, proportional to motor speed, which is compared with a speed reference signal to develop an error signal for the pulse width modulator. Automatic shutdown of the motor occurs for controlled periods when a blocked pump condition occurs and motor current rises above a predetermined limit.

REFERENCES:
patent: 3569807 (1971-03-01), Ulrich
patent: 3569810 (1971-03-01), Thiele
patent: 3588654 (1971-06-01), Balazs
patent: 3683253 (1972-08-01), Rummel et al.
patent: 3803470 (1974-04-01), Vosteen

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