Power winch is a device that uses electric power to wind steel wire cable around a spool, pulling an object toward the winch with ease. Typically used to pull a boat or a vehicle onto a trailer, the power winch uses an electric motor in place of the hand crank commonly used on a manual winch. The most common power winch uses a 12-volt battery as a power source to operate the powerful winch motor; nevertheless, if the winch is lacking power or having difficulty in winching the vehicle or boat onto a trailer, the cable can be doubled by placing a block pulley on the cable, virtually doubling the winching power available.
In order to let the power winch have well performance, using the firm steel wire cable is very important. Unlike the usual automotive wire used in the vehicle, which is primarily made by metal with more flexibility, the steel wire cable is much stronger than auto wiring products. Steel wire cable is the primary retrieval material used on a power winch. However, many winches are equipped with a flat nylon strap instead of the wire cable. The use of the nylon strap prevents kinking and fraying of the wire cable that is often present on older winch cables. Steel wires for wire ropes are normally made of non-alloy carbon steel with a carbon content of 0.4 to 0.95%. The wires are patented (heat process) 70 and 2450 N/mm². The very high strength of the rope wires enables wire ropes to support large tensile forces and to run over sheaves with relatively small diameters.
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