Arrangement, operating method and circuit for a ring motor-driven mill

The invention relates to an arrangement for receiving characteristic data of a ring motor-driven mill which comprises a rotating mill casing (13) with rotor coil and a stator (5) having stator coils, wherein a transmission of vibrations of the mill casing via the rotor coils on stator coils and / or positioned on the stator measuring coils (6) takes place, and the assembly comprising: at least one stator (1, 2, 3) which is designed for tapping off the induced voltages at the power supply (e, F), for detecting vibrations of the mill casing (13) at the position of the at least one stator coil on the stator, the at least one stator coil and / or the at least one measuring coil (6), which is designed for tapping off the induced voltages in a sector (17) of the mill casing (13) is positioned in the relation to the circumference of the mill shell (13) large vibrations of the mill shell (13) can be expected. For this purpose, a method is described comprising the following steps: the induced on at least one stator coil and / or at least one measuring coil (6) induction voltage will, by tapping at the power supply (E, F) of the at least one stator (1, 2, 3) and / or determined by tap on at least one measuring coil (6), there is derived at least one state variable of a milling process, representing the state of filling of the mill in the sector of the respective coil.