Electric current limiting device for winch responsive to multipl

Details Electric current limiting device for winch responsive to multipl Electric current limiting device for winch responsive to multipl

1994-06-09

1997-07-15

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 93, 361 97, H02H 708

Patent

active

056488874

ABSTRACT:
A winch system including an electric motor is protected against an overload condition by use of a current sense device and a current limiting device. The current limiting device employs multiple current thresholds to account for normal current usage by the motor during an initial current inrush period and during subsequent normal operation. The current limiting device also references battery voltage to establish current thresholds as a function thereof and thereby establish shutdown conditions corresponding to consistent motor load conditions. Overall, the current limiting device is responsive to multiple winch device states of operation and more fully protects the winch system against damage due to an overload condition.

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