EP2412864A2 - Laundry treatment device - Google Patents

Abstract

The apparatus (5) has an electromotor (14) obtaining electrical power from rotary movement of a laundry drum (12). A motor controller (18) controls a vibration damper (24) depending upon vibration movement of the laundry drum to damp vibration movement of the drum, where the movement is detected by a vibration sensor (28) or an acceleration sensor. The vibration damper is designed as an electric controllable friction damper. The controller controls the electromotor to slow down the rotating movement of the drum. An independent claim is also included for a method for operating a laundry treatment apparatus.

Description

The present invention relates to a laundry treatment appliance, in particular a laundry treatment appliance with an active vibration damping system.

A laundry treatment device such as a washing machine, a tumble dryer or a washer dryer typically has a tub (also referred to as a wash tub), a laundry drum rotatably mounted in the tub, and an electric motor for driving the laundry drum. The tub is held, for example via a plurality of vibration damper movable in the housing of the laundry treatment appliance.

In a spin operation of the laundry treatment appliance, an unevenly distributed load applied to the circumference of the laundry drum can cause unwanted movements of the tub, which can lead to a movement of the same, but at least to an undesirable noise at a rigid coupling of the tub to the outer wall of the laundry treatment device. The same applies to a washing process by a free-falling and rolling load in the laundry drum.

To be able to react to an imbalance during spin or wash operations, various measures are known to determine such an imbalance. That in the DE 102 34 053 C1 The method described is based on a measurement of the periodic fluctuation of the electrical power consumption of the drive motor of the laundry drum. The DE 44 31 846 C2 beats to compare the applied during acceleration of the laundry drum torques of the electric motor with the applied to maintain a constant speed torques. Next reveal the DE 103 45 591 B1 , the DE 10 2004 053 216 B3 and the DE 10 2005 037 144 B4 Various types of vibration sensors for detecting oscillatory movements of a vibrationally suspended indoor unit of a laundry treatment appliance to a center of gravity in at least one spatial axis.

In the DE 10 2005 037 144 B4 Furthermore, a laundry treatment device is described in which the inner unit via at least one spring, which is secured between the housing and preferably the upper portion of the tub, and at least one friction damper, which secures between the tub and the lower portion of a side wall or the bottom of the housing is suspended, vibrationally suspended. Together with the mass of the tub and its contents, the springs and friction dampers form the vibration and damping system of the laundry treatment appliance.

Friction dampers in their simplest form consist of an outer body (e.g., tube) and a plunger, preferably plastic, coaxially displaceable therein or coaxially therewith. For example, a rubber-like, porous pad is inserted between the plunger and the outer body, which may be saturated with grease or a fat-like liquid. The object of this pad is to increase the friction between the plunger and the outer body and to convert the kinetic energy of, for example, a tub in frictional heat.

The damping behavior of such a friction damper is largely constant. It only changes by the heating of the pad and the friction surfaces, which over time leads to a wear of the pad. Over the life of the laundry treatment appliance, this so-called "setting" can lead to a decrease in the frictional forces, whereby the damping effect the friction damper is reduced. In addition, the tub can perform so-called yaw movements that can not be effectively prevented by such friction damper in an unfavorable arrangement.

In order to avoid the above-described rigid damping behavior, friction dampers have been developed, which have differently pronounced friction surfaces, which lead to a variable vibration damping, wherein the damping property changes with increasing stroke of the plunger. Typically, the degree of damping is nearly zero with a small stroke and increases with an increase in the ram displacement.

This type of friction damper is also called "free-lift friction damper". The properties of these friction dampers can be influenced by the choice of the contours of the friction surfaces and are substantially constant over the life of the laundry treatment device apart from natural aging processes. Such a free-lift friction damper is for example in the DE 40 14 166 A1 described.

The EP 0 878 574 B1 discloses a method for actively dampening vibrations in a laundry treating appliance. The friction damper in this case contain a magnetorheological medium, the rheological properties (eg viscosity) can be changed by applying a magnetic field, so as to influence the damping properties of the friction damper. In the method proposed in this document, a speed deviation of the electric motor is detected and generates a control signal when a threshold value for this speed deviation is exceeded. This control signal generates a magnetic field inside the friction damper whose flux density is proportional to the actuating signal and thus to the extent of the rotational speed deviation.

Such controllable friction dampers are not yet used as standard in laundry treatment equipment, since in a power failure their functionality is lost or severely limited because the magnetorheological Liquid without excitement is typically low viscosity and consequently can cause no or only low damping properties. Particularly in the case of large imbalances, in the event of a power failure due to the further rotation of the laundry drum, very great deflections of the tub can occur, which can lead to damage to the laundry treatment appliance and cause disturbing noises.

The invention has for its object to provide a laundry treatment device with an actively controllable vibration damping, which ensures a safe leakage of the laundry drum even with a malfunction of the power supply.

This object is achieved by a laundry treatment appliance having the features of claim 1. Advantageous refinements and developments of the invention are the subject of the dependent claims 2 to 6.

The laundry treating appliance includes: a laundry treating device having a rotatably mounted laundry drum, the laundry treating device being movably supported in a housing of the laundry treating appliance; an electric motor for rotationally driving the laundry drum; a controller for driving the electric motor, the controller being connectable to a power supply; at least one vibration sensor for detecting a vibration movement of the laundry treating apparatus; and at least one vibration damping device for damping a vibration movement of the laundry treatment device. In this case, the vibration damping device has at least one controllable vibration damper, which can be controlled by the control as a function of the vibration movement of the laundry treatment device detected by the at least one vibration sensor in order to change its vibration damping properties. In addition, the controller is designed such that it controls the electric motor in a malfunction of the power supply connected to it such that it gains electrical energy from a rotational movement of the laundry drum and this control of And, depending on the vibration movement of the laundry treating device detected by the vibration sensor, drives the at least one vibration damper to dampen vibration movement of the laundry treating device and / or drives the electric motor to brake the rotary motion of the laundry drum.

The laundry treating appliance of the invention includes an actively controllable vibration damping system. This is only functional if the (engine) control and the vibration damping system are supplied with electrical energy. In order to prevent imbalance of the laundry treating apparatus in case of malfunction of the power supply (e.g., power failure), causing no damage to the laundry treating appliance, the vibration damping system is kept functional even in such a malfunction of the power supply.

For this purpose, the (motor) control is designed such that, in the event of a malfunction of the power supply connected to it, it controls the electric motor in such a way that it gains electrical energy from a rotary movement of the laundry drum and makes it available to the control. Electric motors can act as a power generator and induce a voltage that is available via the motor connection lines of the control through the further rotating laundry drum in the event of a power failure in the stator winding. With suitable control of the power electronics, the DC link of the motor control electrical energy can be supplied. So the engine control can maintain their functionality even in case of power failure, as long as the expiring laundry drum kinetic energy is available.

Since the main control of the laundry treatment device typically ceases to function after a few moments in the event of a power failure, the motor control no longer has any communication partner available. Therefore, the motor controller must be able to autonomously decide on the continuation in the event of a malfunction of the power supply to take appropriate safety measures. The (engine) control is therefore designed such that, in the event of a malfunction of the power supply in response to the vibration movement of the laundry treatment device detected by the vibration sensor, it activates the at least one vibration damper to dampen a vibration movement of the laundry treatment device and / or drives the electric motor, to brake the rotary motion of the laundry drum.

The electrical energy induced in the electric motor is preferably stored intermediately in an energy store of the electric motor or the engine control.

The "laundry treatment device", sometimes referred to as an internal unit in the prior art described above, contains in particular the rotatably mounted laundry drum for receiving the laundry to be washed and / or dried and usually the tub or laundry tub for receiving the laundry drum.

As a "vibration sensor", a sensor for directly detecting a vibration or a device for determining a vibration movement from other parameters such as speed, torque or power consumption of the electric motor can be used. In one embodiment, the vibration sensor is a movement of the laundry treatment device or its tub

The "vibration damping device" has at least one (actively) controllable vibration damper. That the vibration damping device may have one, two, three, four or more controllable vibration dampers and also have further vibration dampers with non-variable damping properties.

The motor control according to the invention is designed such that it in a malfunction of the power supply connected to the electric motor so that it obtains electric power from a rotational movement of the laundry drum and provides it to the controller, and controls the at least one vibration damper in response to the vibration movement of the laundry treatment device detected by the vibration sensor to dampen a vibratory movement of the laundry treatment device, and / or the Electric motor controls to brake the rotational movement of the laundry drum. This means that the electrical energy obtained by the electric motor in the event of a malfunction of the power supply is sufficient to continue to operate the engine control and to further detect and evaluate the measured values with the vibration sensor.

In one embodiment of the invention, at least one speed and / or torque sensor for detecting a rotational speed, a rotational speed fluctuation, a torque and / or a torque fluctuation of the electric motor is further provided. The controller is then also designed such that it controls the electric motor and / or the at least one vibration damper in the event of a malfunction of the power supply connected to it as a function of the measured variable detected by the at least one rotational speed and / or torque sensor.

In a further embodiment of the invention, at least one device is provided for detecting a phase position of an imbalance of the laundry drum. The controller is then designed in such a way that the electric motor and / or the at least one vibration damper in the event of a malfunction of the power supply connected to it also in dependence on the detected phase position of the imbalance, i. phase-dependent to the position of the imbalance drives. The control of the damping properties of the at least one controllable vibration damper is preferably carried out in an anticipatory manner to the position of the imbalance of the laundry treatment device.

With knowledge of the respective vibration movement through the at least one vibration sensor, the respective speed, speed fluctuation, torque and / or torque fluctuation of the electric motor by the speed and / or torque sensor and the respective phase position of the imbalance of the laundry drum, the engine control can take the optimum security measures even in case of malfunction of the power supply to prevent damage to the laundry treatment appliance.

In a still further embodiment of the invention, the laundry treatment appliance also has a door locking device. The controller is then preferably designed such that it controls the door lock device in the event of a malfunction of the power supply connected to it as a function of the measured variable detected by the speed and / or torque sensor. So even with a power failure can be prevented that the door lock is released as long as the laundry drum still rotates or too fast rotates.

Furthermore, the controller is preferably also designed to detect a malfunction of the power supply connected to it. In this advantageous embodiment, the controller can respond without loss of time to a malfunction of the power supply and initiate the necessary safeguards. Preferably, a malfunction of the power supply can be achieved by monitoring the input voltage and frequency. Likewise, can be detected by the engine control itself by this functionality of the engine control when the malfunction of the power supply is corrected again. In this case, the motor control can then optionally independently return to the normal control of the electric motor.

The at least one controllable vibration damper of the vibration damping device is preferably an electrically controllable friction damper. Preferably, it is a friction damper with a magnetorheological or electroviscous medium (in particular liquid). However, it is also possible to use friction dampers in which the frictional forces of two opposing, contacting friction surfaces can be varied by electromechanical change of the contact pressure. As well For example, friction dampers may be used in which a flow passage between two adjacent chambers filled with a fluid (eg, air or liquid) may be narrowed or widened to alter the damping characteristics. Instead of the flow opening with a variable opening cross-section, the use of a switchable capillary pore membrane or the like is also conceivable.

The above object is likewise achieved by a method for operating a laundry treatment appliance having the features of claim 7. Advantageous refinements and developments of the invention are the subject of the dependent claims 8 to 10.

The method for operating a laundry treatment appliance, in particular a laundry treatment appliance of the invention described above, is characterized in that the controller controls the electric motor in case of malfunction of the power supply connected to it so that it gains electrical energy from a rotary movement of the laundry drum and this control of Provides, and in response to a vibratory movement of the laundry treatment device, at least one vibration damper activates to dampen the vibration movement of the laundry treatment device, and / or controls the electric motor to brake the rotational movement of the laundry drum.

The above statements on the advantages of the laundry treatment appliance according to the invention apply correspondingly to this operating method.

In one embodiment of the invention, the controller controls the electric motor and / or the at least one vibration damper in the event of a malfunction of the power supply connected to it as a function of a rotational speed, a rotational speed fluctuation, a torque and / or a torque fluctuation of the electric motor.

In a further embodiment of the invention, the controller controls the electric motor and / or the at least one vibration damper in the event of a malfunction of the power supply connected to it as a function of a phase position of the imbalance of the laundry drum.

In a still further embodiment of the invention, in the event of a malfunction of the power supply connected to it, the motor control also activates a door locking device of the laundry treatment device, preferably as a function of a rotational speed or a torque of the electric motor.

• Bei kleinen, unkritischen Unwuchtwerten, kann die kinetische Energie der Wäschetrommel dazu genutzt werden, um die Motorsteuerung möglichst lange mit Energie zu versorgen. In diesem Fall wird dem System nur eine minimale Energiemenge entnommen und die Wäschetrommel hat eine lange Auslaufszeit. Andererseits die entnommene Energiemenge auch maximiert und überschüssige Energie in den Wicklungen des Elektromotors in Wärme umgesetzt werden, sodass sich ein schnelles Abbremsen und dementsprechend eine kurze Auslaufszeit der Wäschetrommel nach einem Netzausfall ergeben.
• Bei kleinen, unkritischen Unwuchtwerten ist nur wenig oder keine Energie für die gesteuerten Schwingungsdämpfer notwendig. Das System kann weitestgehend ungedämpft auslaufen.
• Bei größeren bis hin zu kritischen Unwuchtwerten wird die der Motorsteuerung zurückgespeiste Energie dazu benötigt, die gesteuerten Schwingungsdämpfer mit Energie-zu versorgen. Die Auslaufszeit der Wäschetrommel hängt in diesem Fall von der Energiemenge ab, die notwendig ist, um einerseits die Motorsteuerung und Sensoren, andererseits die gesteuerten Schwingungsdämpfer mit Energie zum versorgen. Damit kann ein möglichst vibrations- und anschlagsfreier Auslauf der Wäschetrommel sichergestellt werden.

• Sofern die für Motorsteuerung und die steuerbaren Schwingungsdämpfer benötigte Energiemenge nicht der maximal zu entnehmenden Energiemenge entspricht, kann die Differenzenergiemenge wie bereits oben beschrieben in den Statorwicklungen des Elektromotors in Wärme umgesetzt werden. ln diesem Fall verkürzt sich die Auslaufzeit der Wäschetrommel nach einem Netzausfall weiter.
• Mit Erreichen des Trommelstillstandes kann keine weitere elektrische Energie mehr gewonnen werden. Eine Bestromung der steuerbaren Schwingungsdämpfer ist dann auch nicht mehr notwendig. Die weitere Laufzeit der Motorsteuerung hängt jetzt nur noch von der Restkapazität der Zwischenkreiskondensatoren ab und kann durch aktive Entladung abgekürzt werden.
• Sofern der Netzausfall vor Erreichen des Trommelstillstandes wieder beendet wird, entscheidet die Motorsteuerung selbständig über den weiteren Drehzahlverlauf des Elektromotors. Falls die aktuelle Drehzahl noch über einer Anlegedrehzahl liegt, also jener Drehzahl bei der die Beladung vollständig durch Zentrifugalkräfte an den Rand der Wäschetrommel gepresst wird, könnte zur ursprünglichen Drehzahl zurückgekehrt, zumindest aber die aktuelle Drehzahl beibehalten werden.

According to the invention, in a laundry treatment appliance having an actively controllable vibration damping system in case of a malfunction of the power supply, one or more of the following safety measures can advantageously be taken:

• For small, uncritical imbalance values, the kinetic energy of the laundry drum can be used to provide the motor control with energy as long as possible. In this case, only a minimum amount of energy is removed from the system and the laundry drum has a long drain time. On the other hand, the extracted amount of energy also maximized and excess energy in the windings of the electric motor are converted into heat, resulting in a fast deceleration and, accordingly, a short flow time of the laundry drum after a power failure.
• For small, uncritical imbalance values, little or no energy is required for the controlled vibration dampers. The system can expire largely unattenuated.
• For larger to critical unbalance values, the energy fed back to the engine management system is needed to power the controlled vibration dampers. The outlet time of the laundry drum depends in this case on the amount of energy that is necessary to provide on the one hand, the engine control and sensors, on the other hand, the controlled vibration damper with energy. This can be a possible vibration and stop-free outlet of the laundry drum to be ensured.

• If the amount of energy required for motor control and the controllable vibration dampers does not correspond to the maximum amount of energy to be extracted, the difference energy amount can be converted into heat as described above in the stator windings of the electric motor. In this case, the drainage time of the laundry drum further shortens after a power failure.
• Upon reaching the drum standstill no further electrical energy can be gained. An energization of the controllable vibration damper is then no longer necessary. The further duration of the motor control now depends only on the residual capacity of the DC link capacitors and can be abbreviated by active discharge.
• If the power failure is ended again before reaching the drum standstill, the motor control decides independently on the further speed curve of the electric motor. If the current speed is still above an application speed, ie the speed at which the load is completely pressed by centrifugal forces to the edge of the laundry drum, could be returned to the original speed, but at least the current speed can be maintained.

The present invention is applicable to any laundry treating appliances such as washing machines, clothes dryers and laundry dryers.

The above and other features and advantages of the invention will become apparent from the following description of a preferred, non-limiting embodiment better understood with reference to the accompanying drawings.

Figur 1

ein stark vereinfachtes Blockschaltbild eines Wäschebehandlungsgerätes gemäß einem bevorzugten Ausführungsbeispiel der Erfindung und

Figur 2

ein stark vereinfachtes Blockschaltbild eines Wäschebehandlungsgerätes gemäß einem weiteren bevorzugten Ausführungsbeispiel der Erfindung.

It shows

FIG. 1

a highly simplified block diagram of a laundry treatment appliance according to a preferred embodiment of the invention and

FIG. 2

a highly simplified block diagram of a laundry treatment appliance according to another preferred embodiment of the invention.

This in FIG. 1 exemplified laundry treatment device (eg a washing machine) 5 has in a known manner a tub 10 and a rotatably mounted in the tub 10 laundry drum 12 for receiving the laundry to be treated (load) on. The tub 10 and the laundry drum 12 together form a laundry treatment device of the invention. The laundry drum 12 is preferably equipped with a device for passive unbalance compensation (eg Kugelauswuchter).

For example, the axis of rotation of the laundry drum 12 extends substantially horizontally (front loader) or vertically (top loader). The laundry drum 12 is driven by an electric motor 14, wherein the drive axle drives either directly or indirectly, for example via a V-belt (drive connection 16).

The electric motor 14 is driven by a (motor) control 18, which is connected to a power supply or a network 19 for supplying energy. In addition, the washing machine 5 still has a main controller 20, which is connected to the motor controller 18 and also to the network 19. Alternatively, as in FIG. 2 shown, the (engine) controller 18 via the main controller 20 to the network 19 may be connected.

The laundry treating device 10-12 is held vibratable in the housing of the washing machine 5. For this purpose, at least one spring 22 is provided, which is preferably fastened in the upper region between the tub 10 and the housing. Furthermore, a vibration damping device is provided which has at least one vibration damper 24, which is preferably fastened in the lower region between the tub 10 and the housing of the washing machine 5.

According to the invention, the vibration dampers 24 are controllable vibration dampers whose damping properties can be actively controlled by the engine control unit 18. While during normal operation of the washing machine 5, these vibration dampers 24 can optionally also be actuated by the main controller 20, they must be able to be activated by the engine controller 18 in the event of a power failure (i.e., a malfunction of the power supply 19).

Friction dampers with a magnetorheological or electroviscous medium are preferably used for these controllable vibration dampers 24. By the main controller 20 and the motor controller 18, a magnetic field or a control voltage of these friction damper 24 can be influenced, causing a change in the at least one rheological or electroviscous property of the medium and thus the damping properties of the vibration damper 24.

For monitoring the laundry treatment device 10-12 various measures are provided. The electric motor 14 (or optionally also the motor control 18) is equipped with a speed and / or torque sensor 26. This speed and / or torque sensor 26 detects a rotational speed, a rotational speed fluctuation, a torque, a torque fluctuation or the like of the electric motor 14. Optionally, the power consumption of the electric motor 14 can also be detected.

Furthermore, at least one vibration sensor 28 is provided to detect a vibration movement of the laundry treatment device 10-12 in at least one spatial direction. In principle, any sensors and devices which are known or are still known to the person skilled in the art and which measure at least one of the physical units travel / distance, speed or acceleration can be used for this purpose. Preferably, an acceleration sensor may be used as the vibration sensor 28.

The measurement results of the speed and / or torque sensor 26 and of the vibration sensor 28 are provided to the motor control 18, which then on the one hand the electric motor 14 and on the other hand the at least one controllable vibration damper 24 according to these measurement results and possibly other circumstances (eg current washing program, etc .). Furthermore, the engine control unit 18 can also control a door locking device 32, so that the washing machine door can only be opened when the laundry drum 12 no longer or no longer rotates too fast.

In normal operation, ie when the power supply is functioning, the main controller 20 and the motor controller 18 are directly ( FIG. 1 ) or in series ( FIG. 2 ), and the electric motor 14, the vibration damper 24 and the sensors 26, 28 are supplied via the motor controller 18 from the network 19 with electrical energy. In case of a malfunction of the power supply 19 (eg power failure), the main controller 20 after a few moments their operation and also the electric motor 14 is no longer supplied with power. In other words, there is no energy flow 30 to the electric motor 14 more.

The motor controller 18 is designed such that it detects such a power failure, for example, based on the mains input voltage and frequency and can therefore initiate appropriate security measures. First, the motor controller 18 controls the electric motor 14 to function as a generator and to convert the kinetic rotational energy of the draining laundry drum into electrical energy, that of the motor controller 18, the controllable vibration dampers 24, the sensors 26, 28 and the door lock device 32 to provide (energy flow 30 to the engine controller 18 down). The electrical energy induced in the electric motor 14 is preferably temporarily stored in an energy store of the electric motor 14 or the motor control 18.

In this way, an "emergency operation" of the motor controller 18 is secured even in case of power failure. The engine control 18 can thus ensure even with an expiring laundry drum 12 that this causes no damage to the washing machine even with existing imbalance. In particular, the engine controller 18 may continue to drive the controllable vibration dampers 24 to dampen vibratory motion of the laundry treating device 10-12 and / or brake the electric motor 14. Preferably, the motor controller 18 can derive manipulated variables for at least one vibration damper 24 and the electric motor 14 from the measured variables of a speed and / or power fluctuation, a phase position of an imbalance and a movement of the tub.

REFERENCE NUMBER LIST

5

Laundry treatment device

10

tub

12

washing drum

14

electric motor

16

drive connection

18

(Motor) control

19

Power supply, network

20

main control

22

feather

24

vibration

26

Speed and / or torque sensor

28

vibration sensor

30

energy flow

32

Door locking device

Claims (10)

Laundry treatment device, with
a laundry treating apparatus (10-12) having a rotatably mounted laundry drum (12), the laundry treating apparatus (10-12) being movably supported in a housing of the laundry treating appliance (5);
an electric motor (14) for rotationally driving the laundry drum (12);
a controller (18) for driving the electric motor (14), the controller (18) being connectable to a power supply (19);
at least one vibration sensor (28) for detecting a vibration movement of the laundry treating apparatus (10-12); and at least one vibration damping device for damping a vibration movement of the laundry treatment device (10-12), wherein the vibration damping device comprises at least one controllable vibration damper (24) generated by the controller (18) in response to the vibration movement detected by the at least one vibration sensor (28) Laundry treatment device (10-12) is controlled to change its vibration damping properties,
characterized in that
the controller (18) is designed such that, in the case of a malfunction of the power supply (19) connected to it, - The electric motor (14) controls such that it from a rotational movement of the laundry drum (12) gains electrical energy and this the controller (18) provides, and - In response to the vibration of the laundry treatment device (10-12) detected by the vibration sensor (28) the at least one vibration damper (24) controls to dampen a vibratory motion of the laundry treating device (10-12) and / or drives the electric motor (14) to brake the rotational movement of the laundry drum (12). Laundry treatment appliance according to claim 1,
characterized in that
at least one speed and / or torque sensor (26) for detecting a speed, a speed fluctuation, a torque and / or a torque fluctuation of the electric motor (14) is provided; and the controller (18) is configured to connect the electric motor (14) and / or the at least one vibration damper (24) in the event of a malfunction of the power supply (19) connected thereto as a function of the at least one speed and / or or torque sensor (26) controls detected measured variable. Laundry treatment appliance according to claim 1 or 2,
characterized in that
at least one device for detecting a phase position of an imbalance of the laundry drum (12) is provided; and
the controller (18) is designed such that it controls the electric motor (14) and / or the at least one vibration damper (24) in the event of a malfunction of the power supply (19) connected thereto as a function of the detected phase position of the imbalance. Laundry treatment appliance according to claim 2 or 3,
characterized in that
the laundry treating appliance (5) has a door locking device (32); and
the controller (18) is designed such that it controls the door locking device (32) in the event of a malfunction of the power supply (19) connected to it as a function of the measured variable detected by the rotational speed and / or torque sensor (26). Laundry treatment appliance according to one of the preceding claims,
characterized in that
the controller (18) is designed to detect a malfunction of the power supply (19) connected to it. Laundry treatment appliance according to one of the preceding claims,
characterized in that
the at least one vibration damper (24) of the vibration damping device is an electrically controllable friction damper. A method of operating a laundry treating appliance (5) comprising a laundry treating appliance (10-12) having a rotatably mounted laundry drum (12), the laundry treating appliance (10-12) being movably supported in a housing of the laundry treating appliance (5); an electric motor (14) for rotationally driving the laundry drum (12); a controller (18) for driving the electric motor (14), the controller (18) being connectable to a power supply (19); and at least one vibration damping device for damping a vibration movement of the laundry treatment device (10-12),
characterized in that
the controller (18) in the event of a malfunction of the power supply (19) connected to it - The electric motor (14) controls such that this wins electrical power from a rotational movement of the laundry drum (12) and this provides the controller (18), and - in response to a vibratory movement of the laundry treatment device (10-12) at least one vibration damper (24) drives to dampen the oscillatory movement of the laundry treatment device (10-12), and / or the electric motor (14) controls to the rotational movement of the laundry drum ( 12) to brake. Method according to claim 7,
characterized in that
the controller (18) controls the electric motor (14) and / or the at least one vibration damper (24) in the event of a malfunction of the power supply (19) connected to it as a function of a rotational speed, a rotational speed fluctuation, a torque and / or a torque fluctuation of the electric motor ( 14). Method according to claim 7 or 8,
characterized in that
the controller (18) controls the electric motor (14) and / or the at least one vibration damper (24) in the event of a malfunction of the power supply (19) connected thereto as a function of a phase position of the imbalance of the laundry drum (12). Method according to one of claims 7 to 9,
characterized in that
the controller (18) controls a door locking device (32) of the laundry treatment appliance (5) in the event of a malfunction of the power supply (19) connected to it as a function of a speed or a torque of the electric motor (14).

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