NOVELTY - The apparatus (20) has an electrically drivable compressor (1) including a compressor housing (2) in which a compressor wheel (3) is arranged and fastened on an end (4) of a rotor shaft (5). A compressor housing rear wall (6) is adjacent to a compressor wheel rear (36) and fastened on the housing. A stator winding (12) comprises a line formed from litz wires that include first degree of twisting in an end winding region (25a) of the winding and second degree of twisting in a magnetically active section, where the first degree of twisting is higher than the second degree of twisting.    USE - Supercharging apparatus for a combustion engine e.g. internal combustion engine such as diesel engine or otto engine, and fuel cell (all claimed), for a vehicle.    ADVANTAGE - The first degree of twisting is twice as high as the second degree of twisting, thus achieving improved rigidity in the end winding region without unnecessarily large volume being taken up within the magnetically active section. The apparatus allows the litz wires to be completely untwisted in the magnetically active section of the line such that twisting of the litz wires in an end winding on statistical average can be made to reduce or prevent a preferred sequence of the litz wires in the magnetically active sections in direction of rotation of magnetic field of an electric motor, while inducing same summation voltage in individual parallel litz wires. The apparatus allows a power electronics circuit to be arranged adjacent to a cooling jacket, thus markedly improving cooling effect of the cooling jacket with respect to the power electronics circuit, and hence providing compact design and improved cooling of component parts. The stator winding is in the form of winding without the iron core, thus enabling reduction in mass of the compressor and improving efficiency of the apparatus without requiring remagnetizations within non-existing iron core.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a supercharging apparatus.    Electrically drivable compressor (1)    Compressor housing (2)    Compressor wheel (3)    Rotor shaft end (4)    Rotor shaft (5)    Compressor housing rear wall (6)    Stator winding (12)    Supercharging apparatus (20)    End winding regions (25a, 25b)    Compressor wheel rear (36)