Field shunting circuit

Details Field shunting circuit Field shunting circuit

1975-10-28

1977-05-31

Smith, Jr., David

Electricity: motive power systems

Battery-fed motor systems

318251, H02P 516

Patent

active

040272141

ABSTRACT:
A circuit for automatically shunting the field winding of a direct current motor and reapplying full field thereto. A low-level pull-in comparator compares a signal proportional to armature current to a low-level reference potential and causes the field to be shunted when the armature current signal falls below the low-level reference potential. A high-level drop-out comparator compares a signal proportional to armature current to a second independent high-level reference potential and causes the full field to be applied when the armature current signal is greater than the high-level reference potential. Prior to actuation, the pull-in comparator disables the drop-out comparator. Upon actuation, the pull-in comparator latches itself in actuated state and enables the drop-out comparator to be actuated. Upon actuation the drop-out comparator unlatches the pull-in comparator.

REFERENCES:
patent: 3384799 (1968-05-01), Thiele
patent: 3500161 (1970-03-01), Domann et al.
patent: 3656638 (1972-04-01), Ries et al.
patent: 3983462 (1976-09-01), Jones

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