Direct current motor speed controller

Details Direct current motor speed controller Direct current motor speed controller

1993-04-22

1994-05-17

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

388811, H02P 500

Patent

active

053135482

ABSTRACT:
A fire-fighting system in which a liquid chemical foamant is introduced into the water stream in varying amounts so as to maintain a predetermined percentage mixture irrespective of variations in the water flow includes a motor-driven pump where the motor is controlled over a first speed range by pulse width modulating the drive to the motor and over a second speed range, producing intermittent motion, by burst width modulating the drive signal when it is operating at its minimum pulse width modulated duty cycle. Using this technique the range of available motor speeds is extended well beyond that which can be achieved using pulse width modulation of the motor drive signal alone.

REFERENCES:
patent: 4194144 (1980-03-01), Reynolds
patent: 4209258 (1980-06-01), Oakes
patent: 4234007 (1980-11-01), Titone et al.
patent: 4280082 (1981-07-01), Acharya et al.
patent: 4694228 (1987-09-01), Michaelis
patent: 4751439 (1988-06-01), Buchwald et al.
patent: 4795314 (1989-01-01), Prybella et al.
patent: 4833586 (1989-05-01), Inaba et al.
patent: 4841207 (1989-06-01), Cheyne
patent: 4983891 (1991-01-01), Sekimoto
patent: 5156005 (1992-10-01), Redlich
patent: 5202951 (1993-04-01), Doyle

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