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For the InductivePower Transfer (IPT) one primary and one secondary coil as well as a rectifier are required. The primary coil is thereby located on the ground beneath the vehicle and fed by alternating current. Due to the generated alternating magnetic field an alternating voltage is induced in the secondary coil which is positioned underneath the vehicle. The rectifier then converts the ACpower into DCpower before storage. Sometimes the vehicle has to be lowered for the sake of a more efficient energy transmission.