Active part of an electric machine, wherein the active part comprises: - at least two teeth which each have a magnetically permeable material and which each protrude from a lateral surface of the active part in the radial direction , and - at least one winding groove which in each case is arranged between a pair of the at least two teeth , wherein the at least one winding groove is arranged substantially along an axis of rotation of the active part and wherein an electrical winding is in the respective winding groove , wherein - at least one first open recess is provided, which in each case is arranged on or in one respective tooth in one respective plane, - wherein the respective plane is spanned by a substantially radial direction and a direction substantially along the axis of rotation , - wherein at least one thermally conductive element is provided, which has a thermally conductive material, the thermal conductivity thereof being greater than that of the magnetically permeable material, characterised in that the at least one thermally conductive element is arranged partially in the respective first open recess , wherein the electrical winding located in the respective winding groove has a surface which faces a radial opening of the respective winding groove , wherein the at least one thermally conductive element is designed such that the at least one thermally conductive element is arranged at least partially in the radial direction adjacent to the respective surface of the respective electrical winding facing the radial opening. - at least two teeth which each have a magnetically permeable material and which each protrude from a lateral surface of the active part in the radial direction , and - at least one winding groove which in each case is arranged between a pair of the at least two teeth , wherein the at least one winding groove is arranged substantially along an axis of rotation of the active part and wherein - at least one first open recess is provided, which in each case is arranged on or in one respective tooth in one respective plane, - wherein the respective plane is spanned by a substantially radial direction and a direction substantially along the axis of rotation , - wherein at least one thermally conductive element is provided, which has a thermally conductive material, the thermal conductivity thereof being greater than that of the magnetically permeable material, - at least one first open recess is provided, which in each case is arranged on or in one respective tooth in one respective plane, - wherein the respective plane is spanned by a substantially radial direction and a direction substantially along the axis of rotation , - wherein at least one thermally conductive element is provided, which has a thermally conductive material, the thermal conductivity thereof being greater than that of the magnetically permeable material, characterised in that the at least one thermally conductive element is arranged partially in the respective first open recess , wherein the electrical winding located in the respective winding groove has a surface which faces a radial opening of the respective winding groove , wherein the at least one thermally conductive element is designed such that the at least one thermally conductive element is arranged at least partially in the radial direction adjacent to the respective surface of the respective electrical winding facing the radial opening. <EOS>