D-C motor flashover protection

Details D-C motor flashover protection D-C motor flashover protection

1976-12-22

1978-09-05

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

322 28, 322 64, 361 30, H02H 709

Patent

active

041124758

ABSTRACT:
A method and apparatus for detecting and correcting the occurrence of flashover in a direct current electric motor. The polarity and magnitude of voltage on the field winding of the motor is continuously monitored. Detection of a sudden reversal of the polarity of the field voltage accompanied by a rapid increase in magnitude results in the generation of a flashover signal. The flashover signal is coupled to power controlling elements regulating power supplied to the motor and is effective to force removal of power from the motor. In a preferred embodiment the apparatus is disclosed in a two-motor system with two field windings serially connected such that the field voltage monitoring is accomplished on a differential basis.

REFERENCES:
patent: 560503 (1896-05-01), Ihlder
patent: 1239795 (1917-09-01), Klipphahn
patent: 1602743 (1926-10-01), Benson
patent: 3368109 (1968-02-01), Johansson
patent: 4019120 (1977-04-01), Fattic

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