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Abstract

A device for the contactless inductive transmission of electric energy to a movable consumer has a stationary primary circuit designed as an arrangement of elongated parallel leads connected to a source of high frequency alternating voltage or current and a transmission head arranged on the movable consumer. The transmission head consists of a ferrite core and of a secondary winding that surrounds the ferrite core and is magnetically coupled to the primary circuit. The primary circuit lead arrangement has an outer lead designed as an almost closed housing (7) and a middle lead (6) arranged approximately at the center of the housing. The current (11) that flows in the outer lead has the same intensity but an opposite flow direction to the current in the middle lead. The middle lead (6) is surrounded by a U-shaped ferrite core (2) that carries the secondary winding (W.sub.2). In order to transmit electric energy independently and at the same time to several movable consumers, a constant medium frequency current (J.sub.1) flows through the transmission device. The current is kept constant in that the transmission arrangement is connected in parallel to a capacitor (C.sub.E) connected in series to an inductor (L.sub.E) and to a medium frequency voltage source (MFG1). A resonance is created between the inductor (L.sub.E) and the capacitor (C.sub.E) at the frequency (fo) of the medium frequency voltage source (MFG1).

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