The present invention is related to a method for winding a dual-layer flat wire coil, and to method for winding a multi-layer flat wire coil. Furthermore, the present invention is related to a device for winding such coils and to a dual-layer flat wire coil and to a multi-layer flat wire coil obtainable by performing the method of the present invention. Finally, the invention is related to a linear motor comprising such a dual-layer flat wire coil and/or multi-layer flat wire coil. According to the invention, an auxiliary winding core is used to temporarily store wire that is intended to form the odd layer of any pair of layers in the multi-layer coil.