An eddy current separator unit comprises a drivable conveyor belt 24 for supply of a stream of fractions which contain non-ferrous metals, a rotatable outer drum 15 over which the conveyor belt 24 is guided, and a rotatable magnetic rotor 1 positioned inside the outer drum 15 for the generation of eddy currents. The magnetic rotor 1 is positioned eccentrically inside the outer drum 15. An inner drum 10 is provided coaxially around the magnetic rotor 1 and eccentrically within the outer drum 15, such that an outer gap 18 with a varying thickness is present in between the eccentrically positioned inner and outer drums 10, 15. An inner gap 13 with a substantially constant thickness is provided in between the magnetic rotor 1 and the inner drum 10.
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