Winch with electronic current limiter

Details Winch with electronic current limiter Winch with electronic current limiter

1991-11-01

1993-05-25

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 31, H02P 700

Patent

active

052143597

ABSTRACT:
A winch having an electronic current limiter to shut off power to the drive motor when a load limit is attained. The electronic current limiter utilizes a linear hall effect transducer mounted in a torroid surrounding a conductor carrying current to the motor. The transducer outputs a voltage which is compared to a regulated preset voltage. The regulated preset voltage is preset at a value that corresponds to the voltage output of the transducer when the maximum allowed current is flowing in the current carrying conductor. The preset voltage establishes a trip point or threshold. The output voltage of the transducer and the preset voltage are compared and when the output voltage of the transducer crosses the threshold or trip point, power to the winch drive motor is shut off. The electronic current limiter includes a reset circuit that requires the motor to be driven in the reverse direction after an overload shut down before the motor may be run in the initial direction. The electronic current limiter includes a time delay circuit to permit momentary overload conditions such as caused by the required high motor starting currents.

REFERENCES:
patent: 4260938 (1981-04-01), Joyer
patent: 4532571 (1985-07-01), Satou
patent: 4873474 (1989-10-01), Johnson
patent: 4905117 (1990-02-01), Beg
patent: 4956590 (1990-09-01), Phillips
patent: 4987358 (1991-01-01), Branam

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