Patent ID: 9509187
Filing Date: 2016-11-29
CPC Classification: H02K

Claim Text:
1. A hollow-cylindrical coreless winding for an electric motor, comprising: a plurality of single coils which are arranged to be distributed across a circumference of the winding, wherein each single coil includes a plurality of turns which are spirally wound around a winding axis that is perpendicular to an axis of the winding, and wherein successive single coils overlap in a roof tile manner, wherein the winding includes at least two phase windings, wherein each of the phase windings includes several of the single coils, wherein the phase windings are furthermore offset with respect to each other in a circumferential direction of the hollow-cylindrical winding, so that the single coils of a first phase winding are arranged, in the circumferential direction of the hollow-cylindrical winding, between the single coils of a second phase winding, and wherein each of the phase windings is wound from a continuous wire; and wherein connecting sections of the continuous wire extend between successive single coils of the phase windings with respect to the axis of the hollow-cylindrical winding radially offset to the single coils, such that said connecting sections are radially offset to an inner diameter of said hollow-cylindrical winding allowing said phase windings to be inserted into each other along a direction of said axis of said hollow-cylindrical winding, wherein the connecting sections of all or all but one of said phase windings are axially offset to an axial end of said hollow-cylindrical winding in a direction away from said axial end and wherein the connecting sections of each of said phase windings have a different axial position with respect to said axis of said hollow-cylindrical winding than the connecting sections of the other of said phase windings.