| 摘要 |
The invention relates to an inductance coil, in particular an inductance coil without an iron core for use in electric power grids, comprising at least two cylindrical winding layers (1), which are disposed concentrically with respect to a coil central axis (7) and are connected electrically in parallel. Said inductance coil comprises at least one means for reducing or minimising sound emissions produced during the operation of the inductance coil. At least the outermost winding layer (1) is designed in this case as a current-conducting, acoustic shield winding (18) opposite the winding layer (1) adjacent in the direction of the coil central axis (7), wherein said shield winding (18) is dimensioned electrically such that it is designed for the transmission of a current intensity, which is only a fraction of the current intensity, to be transmitted by the adjacent winding layer (1). Furthermore, the invention relates to a bracketlike holding element arranged on at least one end face of the inductance coil for reducing sound emissions. |
