Dc motor field shunting circuit

Details Dc motor field shunting circuit Dc motor field shunting circuit

H - Electricity

02

P

318/101, 318/106

H02P 7/298 (2006.01)

Patent

CA 1048105

A B S T R A C T O F T H E D I S C L O S U R E A circuit for automatically shunting the field winding of a series- connected 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 compa- rator disables the drop-out comparator. Upon actuation, the pull-in compa- rator 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.

259635

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