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Method for pumping out liquid from e.g. washing machine, involves controlling motor as function of ripple value and threshold value such that rotational speed of pump is reduced and/or increased when ripple value exceeds threshold value
Method for pumping out liquid from e.g. washing machine, involves controlling motor as function of ripple value and threshold value such that rotational speed of pump is reduced and/or increased when ripple value exceeds threshold value
The method involves deriving vibration behavior of a liquid column in a delivery line from an operating parameter of a drain pump (3) and/or an electric motor (2). A ripple value (W) rising with increasing vibration amplitude of delivery volume flow (V), is determined and compared with a preset threshold value. The electric motor is controlled as a function of the ripple value and the threshold value such that rotational speed (n) of the drain pump is reduced and/or increased when the ripple value exceeds the threshold value. The electric motor is designed as an electronically commutated motor. An independent claim is also included for a device for pumping out liquid from an appliance i.e. household appliance.
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