METHOD AND CIRCUIT ARRANGEMENT FOR DETERMINING THE LOAD AND/OR UNBALANCE OF A LAUNDRY DRUM OF A WASHING MACHINE

摘要

In a method for determining a load and/or an unbalance of a laundry drum of a washing machine driven by an electric motor having a stator with at least one winding coupled to a power inverter controlled by a control unit, the laundry drum is accelerated to a predetermined rotational speed and then slowed down. During the slow-down, the motor operates in generator mode and an electric current flowing through the at least one winding and/or an electric intermediate circuit voltage is measured. The time dependence of the electric power supplied by the electric motor in generator mode is evaluated during a revolution of the laundry drum. The unbalance and/or the load are determined from the measured current values and/or the intermediate circuit voltage and from the determined electric power. A corresponding circuit arrangement and a washing machine with this circuit arrangement are also disclosed.