Method and device for detecting an imbalance in a laundry treatment appliance

Abstract

A load of laundry that is distributed in an imbalanced manner in a laundry treatment appliance can lead to mechanical destruction at higher rotational speeds. A method for detecting an imbalance in a laundry treatment appliance which has a rotating drum and a drive system with electronic control system, a rotational speed or a variable linked with the rotational speed is acquired in the electronic control system as a rotational speed signal, the frequency component of the 2nd order in relation to the mechanical drum rotational speed is determined in the rotational speed signal that is acquired, and an imbalance in the drum is then detected if a value of the frequency component of the 2nd order that is determined exceeds a predetermined limiting value. The method is in particular also suitable for detecting a dynamic imbalance or in the case of laundry treatment appliances with a vertical axis of rotation.

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