Method for determining an imbalance in a laundry drum of a washing machine in the spin mode, drive device and washing machine with a drive device

摘要

An imbalance in a laundry drum 3 a washing machine 1 should be determined in a spin operation. There is provided a method in which the laundry drum 3 is driven by a drive motor 5. In phase strands 7, 8, 9 of the drive motor 5, an electrical alternating voltage U, U, Umittels of an inverter 26 is provided, namely from a DC link voltage U. In at least one of the phase strands 7, 8, 9, an electrical current string I, I, I measured , and depending on measured values for this phase current I, I, I the unbalance is determined. In particular, a profile of an electrical energy E emitted since the start of the spinning operation to the drive motor 5 can be determined over the time t, and a slope ΔE / Δt of this course V, Vcan be used to determine the imbalance. In addition, a corresponding drive device 2 and a washing machine 1 are provided.