Device for winding and unwinding a cable around a drum

A device for winding and unwinding a cable comprising a winch comprising a chassis, drive means and a drum, wherein the drive means include an electric motor used to drive a drum in rotation in relation to the chassis, means for locking/unlocking rotation of the drum in relation to the chassis to prevent and permit rotation of the drum in relation to the chassis, the locking/unlocking means including a first induction coil referred to as the locking/unlocking coil, the locking/unlocking means being designed to immobilize the drum in relation to the chassis when the locking/unlocking coil is not powered electrically, the device also including a second induction coil, referred to as the feedback coil, said feedback coil being powered electrically, and dimensioned and designed such that the magnetic field produced by the assembly formed by the locking and feedback coils, when the locking/unlocking coil is powered electrically, is less than the magnetic field generated by the locking/unlocking coil at a point located at a predetermined distance from the winch, the electrical energizing and de-energizing of the feedback coil being synchronized with the electrical energizing and respectively de-energizing of the locking/unlocking coil.