Contractor tip cleaning circuit

Details Contractor tip cleaning circuit Contractor tip cleaning circuit

1998-01-30

1999-12-14

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

307137, H02H 300

Patent

active

06002559&

ABSTRACT:
A circuit for a direct current electric motor system for reducing contamination in contactor tips includes a semiconductor element in a parallel circuit arrangement with the contactor. The motor system includes a direct current power source coupled to an electric motor through the contactor. A capacitor is coupled in a parallel circuit arrangement with the motor. When the contactor is open, the capacitor is charged by the direct current power source through the semiconductor element. The capacitor will not charge to the same voltage as the direct current power source because of the semiconductor element, creating a voltage differential across the open contactor tips, which is equivalent to the voltage drop across the semiconductor element. Accordingly, the surge of current flowing across the contactor when its is closed cleans the contactor tips.

REFERENCES:
patent: 2817774 (1957-12-01), Kniel et al.
patent: 3029351 (1962-04-01), Akmenkalns
patent: 3092739 (1963-06-01), Lode
patent: 4011464 (1977-03-01), Robbi
patent: 4851707 (1989-07-01), Lindsay
patent: 5502609 (1996-03-01), Thomas et al.

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