Domestic dishwasher

Abstract

The invention relates to a domestic dishwasher (1) comprising a dishwashing container (2); a washware receiving area (4) which can be at least partly moved into and out of the dishwashing container (2); an electric motor (16) which has at least one motor parameter (I), wherein the electric motor (16) moves the washware receiving area (12, 13, 14) into the dishwashing container (2) or at least partly out of same in a driving state and is decoupled from the washware receiving area (12, 13, 14) and / or is switched to a powerless mode in a free running state, and / or a control unit (18) which is designed to control the electric motor (16) at least in the driving state on the basis of at least one control parameter (s); a detection unit (19) which is designed to detect a blockage of the washware receiving area (12, 13, 14) and / or a stop request of a user on the basis of the at least one control parameter (s) and / or a motor parameter (I); and a switch unit (20) which is designed to switch the electric motor (16) to the free running state on the basis of the detected blockage or the detected stop request.

Description

[0001] The present invention relates to a household dishwasher.

[0002] The operation of household dishwashers (hereinafter also referred to as "dishwashers") is to be increasingly simplified. One aspect of this is that a drive mechanism moves a dishware basket, such as an upper or lower rack, out of and into the dishwasher's wash tub for loading and unloading. During this movement, the basket may become blocked by dishes, or a user may wish to stop the moving dishware basket.

[0003] German patent application DE 10 2005 010 616 A1 discloses a household dishwasher with a drive unit designed to automatically move a dishwashing basket out of and into the wash tub. A user can also move the wash tub manually if a switching element disengages the drive unit from the wash tub.

[0004] Documents WO 2018 / 120924 A1 and WO 2020 / 124970 A1 disclose a household dishwasher with a driven dishwashing basket, which is attached to a drive unit via a magnetic device. A user can stop the driven dishwashing basket and move it manually.

[0005] Document US 2008 / 0315739 A1 discloses an electrically driven warming drawer with a drive configured to move the warming drawer out of and into a cabinet. A user can also move the warming drawer out of the cabinet.

[0006] German patent application DE 10 2019 106 198 A1 discloses a dishwasher, in particular a household dishwasher, with a wash chamber providing a wash area for receiving items to be cleaned. The wash chamber has a loading opening for loading items, which can be closed by means of a pivotally mounted wash chamber door. The dishwasher also includes a load carrier that is movable through the loading opening out of and / or into the wash chamber, and an electric motor connected to the load carrier for moving the load carrier. A spindle drive is provided, comprising a threaded spindle connected to the electric motor, a carriage arranged on the threaded spindle, and a carrier-side follower, the follower being detachably engaged with the carriage.

[0007] Against this background, one object of the present invention is to provide an improved household dishwasher.

[0008] Accordingly, a household dishwasher is provided with a wash tub and a dishwashing basket that can be moved into and at least partially out of the wash tub. The household dishwasher further comprises an electric motor which has at least one motor parameter, wherein the electric motor, in a driving state, moves the dishwashing basket into or at least partially out of the wash tub and, in a free-running state, is decoupled from the dishwashing basket and / or switched off, and / or a control unit which regulates the electric motor, at least in the driving state, as a function of at least one control parameter.The household dishwasher further comprises a detection unit which is designed to detect a blockage of the dishwashing tray and / or a user's request to stop the dishwasher depending on at least one control parameter and / or a motor parameter, and a switching unit which is designed to switch the electric motor to the free-running state depending on the detected blockage or request to stop.

[0009] One aspect of the present invention is to detect a blockage in the dishwashing basket using a control parameter and / or a motor parameter. This increases the safety of the driven dishwashing basket, thereby reducing the risk of potential user injury and protecting the dishwashing basket from damage.

[0010] Furthermore, a user's request to stop the dishwashing process can be easily detected. This simplifies the operation of the dishwashing process for the user.

[0011] In this context, a "user request to stop" refers to a user's desire to halt the dishwashing process. This desire is expressed, in particular, by the user exerting force on the dishwashing mechanism, such as applying a force directly to it. Specifically, the user can cause this force directly or indirectly. Direct force means that the user acts directly on the dishwashing mechanism with their hand or another part of their body. Indirect force means that one or more other components of the household dishwasher, such as a door, are interposed between the force exerted by the user and the dishwashing mechanism.

[0012] In this context, the term "user request to stop" is to be understood in a broader sense as also including a user's request for a change in the movement of the dishwashing equipment. This change in movement encompasses, in particular, the characteristics of the dishwashing equipment's speed and direction of movement. Thus, a change in the dishwashing equipment's speed can mean an increase or a decrease in the user's movement speed. Conversely, a change in the dishwashing equipment's direction of movement can mean a reversal of the user's movement. In particular, the user can also directly or indirectly cause the change in the dishwashing equipment's movement.

[0013] A blockage of the dishwashing tray can occur, for example, due to dishes that have fallen over in the dishwashing tray or due to food residue or dishwashing residue that block the drive of the dishwashing tray or parts of the drive, such as gears or racks.

[0014] In this context, "control parameters" refers to parameters that are controlled by the control unit, for example in a control loop, such as a position or an exit path of the dishwashing tray, or that are incorporated into the control system.

[0015] In some embodiments, the control unit is omitted. In this case, the electric motor is controlled by a control unit. The detection of a blockage and / or a stop request then occurs solely based on the motor parameter.

[0016] In this context, "motor parameters" refers to parameters for motor control, such as motor current, motor voltage, or motor speed.

[0017] In this context, a "dishwashing basket" is a receptacle, in particular a basket, for holding items to be cleaned, such as plates, cups, cutlery, or bowls. Specifically, it can be an upper or lower dishwashing basket, also known as an upper and lower dish rack, or a cutlery drawer.

[0018] A "washing container" is, in this context, a container in which one or more items to be washed can be accommodated. The washing container has a washing chamber in which the items are cleaned and dried. The washing container is preferably cuboid in shape.

[0019] According to one embodiment, the detection unit recognizes the blockage and / or the request to stop based on a comparison of the engine parameter with a threshold value.

[0020] The threshold value advantageously defines a switching condition, above which the electric motor is switched to free-running mode. A determining factor could be, for example, exceeding or falling below the threshold value.

[0021] According to one embodiment, the threshold value has a fixed or variable value over time.

[0022] This advantageously ensures that temporal changes in the motor parameter are taken into account in the threshold value, for example due to an undefined or varying load of the washing material intake.

[0023] According to one embodiment, the variable value depends on the motor parameter.

[0024] This advantageously achieves the goal of allowing the threshold to be flexibly adjusted to changing circumstances over time or otherwise.

[0025] According to one embodiment, the control of the electric motor includes a comparison of a target value with an actual value, wherein the control parameter is equal to the target value or the actual value and the detection unit recognizes the blockage and / or the request to stop depending on the comparison.

[0026] By taking the comparison into account, it is particularly possible to detect a case in which the actual value no longer approaches the target value or even deviates from it. In this case, the control system is clearly malfunctioning (which regularly aims to bring the actual value closer to the target value), indicating an external force, for example, in the form of a blockage or a desire to stop. The "comparison" specifically reveals a difference between the target value and the actual value.

[0027] According to one embodiment, the target value is a target position and the actual value is an actual position of the dishwashing tray.

[0028] This advantageously takes into account the position of the dishwashing tray within the threshold value.

[0029] According to one embodiment, a further parameter is determined depending on the actual position of the dishwashing tray relative to a reference position of the same.

[0030] According to one embodiment, the reference position has a fixed or variable value over time.

[0031] This advantageously achieves, for example, that the threshold value is increased during the start-up phase of the electric motor.

[0032] According to one embodiment, the variable value of the reference position corresponds to a respective approach position of the washing material intake.

[0033] This advantageously ensures that, for example, the approach position is taken into account over the entire extension length of the dishwashing tray.

[0034] According to one embodiment, one of the respective approach positions is half an extension length.

[0035] A machine learning unit can be provided, which is configured to determine the threshold based on training datasets. This advantageously allows the threshold to be adapted to user behavior. The machine learning unit can, for example, consist of a neural network or a deep learning algorithm.

[0036] According to one embodiment, in the free-running state a mechanical coupling element decouples the washing material intake from the electric motor, or the electric motor is de-energized.

[0037] This allows the user to move the dishware holder freely by hand, meaning practically without resistance.

[0038] According to one embodiment, the dishware holder can be moved into or at least partially out of the dishwashing container by means of a telescopic extension, wherein the electric motor is arranged to drive an element of the telescopic extension for moving the dishware holder.

[0039] According to one embodiment, the electric motor is a permanent magnet synchronous motor.

[0040] When a permanent magnet synchronous motor is de-energized, it runs freely. This eliminates the need for a mechanical coupling element.

[0041] According to a second aspect, a method for operating a household dishwasher is proposed. In a first step, a dishwashing tray is moved by means of an electric motor, which has at least one motor parameter and / or is controlled according to at least one control parameter. In a second step, a blockage of the dishwashing tray or a user's stop request is detected depending on the motor parameter or the control parameter. In a third step, the electric motor is decoupled from the dishwashing tray or the electric motor is de-energized depending on the detected blockage or stop request.

[0042] The embodiments and features described for the proposed device apply accordingly to the proposed method, and vice versa.

[0043] The units described here, such as the control unit or detection unit, can be implemented using hardware and / or software. For example, the units can be implemented on a microprocessor along with associated memory. The microprocessor and memory can, for instance, be located on the central control unit of a household dishwasher.

[0044] Other possible implementations of the invention also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In such cases, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.

[0045] Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the exemplary embodiments of the invention described below. The invention will be explained in more detail below with reference to preferred embodiments and the accompanying figures.

[0046] They show Fig. 1 a schematic perspective view of an embodiment of a household dishwasher; Fig. 2 a schematic side view of the household dishwasher; Fig. 3 an exemplary time course of a motor current under the influence of an external force; Fig. 4 a time course of a motor current when the threshold value is exceeded due to the influence of the force. Fig. 3 Fig. 5 shows a time-dependent motor current with a time-varying threshold; Fig. 6 shows a schematic representation of a position control loop; Fig. 7 shows a time-dependent motor current when starting up a dishwashing feeder with the time-varying threshold; Fig. 8 shows a time-dependent motor current when the threshold is exceeded. Fig. 7 ; and Fig. 9 Steps of a method for operating a household dishwasher.

[0047] In the figures, identical or functionally equivalent elements have been given the same reference symbols, unless otherwise indicated.

[0048] The Fig. 1 Figure 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a wash tub 2, which can be closed by a door 3, in particular in a watertight manner. For this purpose, a sealing device can be provided between the door 3 and the wash tub 2. The wash tub 2 is preferably cuboid in shape. The wash tub 2 can be arranged in a housing of the household dishwasher 1. The wash tub 2 and the door 3 can form a wash chamber 4 for washing items.

[0049] Door 3 is in the Fig. 1 The door 3 is shown in its open position. It can be opened or closed by pivoting it about a pivot axis 5 located at its lower end. The door 3 can be used to open or close a loading opening 6 of the wash tank 2. The wash tank 2 has a base 7, a top 8 opposite the base 7, a rear wall 9 opposite the closed door 3, and two opposing side walls 10 and 11. The base 7, the top 8, the rear wall 9, and the side walls 10 and 11 can, for example, be made of stainless steel. Alternatively, the base 7 can, for example, be made of a plastic material.

[0050] The household dishwasher 1 further comprises at least one dishware holder 12 to 14. Preferably, several, for example three, dishware holders 12 to 14 can be provided, wherein the dishware holder 12 can be a lower dishware holder or a lower basket, the dishware holder 13 an upper dishware holder or an upper basket, and the dishware holder 14 a cutlery drawer. As the Fig. 1 As further shown, the dishware holders 12 to 14 are arranged one above the other in the washing container 2. Each dishware holder 12 to 14 can be selectively moved into or out of the washing container 2. In particular, each dishware holder 12 to 14 can be pushed or moved into the washing container 2 in an insertion direction E (arrow) and pulled or moved out of the washing container 2 in an extraction direction A (arrow) opposite to the insertion direction E (arrow).

[0051] The Fig. 2 Figure 1 shows a schematic side view of a household dishwasher 1. The dishwasher 1 has a telescopic extension 15 to which the dish holder 13 is attached. The dishwasher 1 also includes an electric motor 16 to drive an element 17, for example, a rail, of the telescopic extension 15. When the electric motor 16 is in drive mode, the dish holder 13 is moved out of and into the wash tub 2. The electric motor 16 is operatively connected to the dish holder 13. For this operative connection, a combination of gears (not shown) and racks (not shown) is provided, for example. The gears and racks mesh with each other and can be arranged, for example, on the dish holder 13 and / or on the telescopic extension 15.

[0052] As in the Fig. 2 As further illustrated, the dishwasher 1 has a control unit 18 (optional) which controls the electric motor 16 depending on at least one control parameter. The control parameter can, for example, be the position of the dish holder 13. The dishwasher 1 also includes a detection unit 19 to detect a blockage of the dish holder 13 or a user's request to stop the cycle. Detection is based on the control parameter or a motor parameter. Detection can also be based on both the control parameter and the motor parameter. The motor parameter is, for example, a motor current I, a motor voltage, a motor temperature, or a motor torque. The control parameter can, in particular, be the extension path of the dish holder 13. Furthermore, the detection unit 19 can include a sensor (not shown) to detect the motor parameter.Furthermore, the dishwasher 1 has a switching unit 20 which switches the electric motor 16 to a free-running state when the detection unit 19 detects a blockage of the dish loading area 13 or the user's request to stop the cycle. The control unit 18, the detection unit 19, and the switching unit 20 are implemented, for example, as hardware and / or software on a central control unit of the dishwasher 1 (not shown). This can be the same control unit that is also responsible for selecting and executing a particular wash program.

[0053] In the free-running state of the electric motor 16, it is not operatively connected to the dishwashing tray 13 to move it in and out. In this free-running state, the dishwashing tray 13 can be moved manually by the user in the inbound direction E (arrow) and the outbound direction A (arrow). A coupling element (not shown), such as a switchable freewheel, can be arranged between the electric motor 16 and the dishwashing tray 13. The coupling element connects the electric motor 16 to the dishwashing tray 13 to move it. Upon detection of a blockage or a request to stop, the switching unit 20 decouples the coupling element from the electric motor 16, allowing the dishwashing tray 13 to move freely.The free-running state of the electric motor 16 can also be achieved by disconnecting the electric motor 16 from the power supply via the switching unit 20, for which purpose the electric motor 16 can advantageously be designed as a permanent magnet synchronous motor. The power disconnection can be effected, for example, via a relay (not shown).

[0054] The following are described embodiments of how the blockage and the user's wish to stop are determined by the recognition unit 19.

[0055] The user's desire to stop is expressed, for example, by a force 21 (arrow) which the user applies to the dishwashing basket 13 when it is extended or retracted. The force 21 (arrow) can also act on the dishwashing basket 13 as a result of a blockage.

[0056] The following describes the case when the dishwashing tray 13 is extended.

[0057] If the dishwashing tray 13 is extended in direction A (arrow) and becomes blocked, or if the user wants to stop it, the external force 21 (arrow) acts on the dishwashing tray 13 in the opposite direction to the extension direction A (arrow). For the dishwashing tray 13 to continue its movement in the extension direction A (arrow), the electric motor 16 must provide an additional force 22 (arrow) to overcome the external force 21 (arrow). To provide the force 22 (arrow), the electric motor 16 must generate a higher torque, which is achieved by increasing the motor current I of the electric motor 16.

[0058] The Fig. 3 This shows the time course of a motor current I before and during a sustained application of the external force 21 (arrow; hereinafter also referred to as "external force 21"). The motor current I before the external force 21 is denoted by I1, while the motor current I after the external force 21 (arrow) is denoted by I2. The time of the start of the external force 21 (arrow) is denoted by t1. The motor current I increases linearly from I1 to I2, but can also increase exponentially, for example. The increase of the motor current I3 continues until time t2, at which point the motor current I reaches the value I2 required to overcome the external force 21 (arrow). The time difference between time t2 and the start of the force t1 is denoted by t3.

[0059] As further in the Fig. 3 As can be seen, the motor current I can also vary dynamically within a current interval I4 and not follow a fixed path of the motor currents I1 and I2. This can occur, for example, due to an undetermined or unknown load on the dishwashing unit 13 or due to dynamic behavior during the dishwashing unit 13 process, such as during a start-up phase, as will be explained in more detail later. The lower limit of the motor current I within the current interval I4 is labeled I5, while the upper limit of the motor current I within the current interval I4 is labeled I6.

[0060] The Fig. 4 The figure shows a time course of the motor current I and an increase in the motor current I3 as a result of the force applied 21 (arrow). To prevent injury to the user or damage to the dishwashing basket 13 or to the dishes (not shown), a fixed threshold value 23 is defined, for example, stored in a memory (not shown) of the dishwasher 1. The detection unit 19 ( Fig. 2 ) compares the motor current I with the threshold value 23. If the motor current I exceeds the threshold value 23, the detection unit 19 recognizes the blockage or the request to stop.

[0061] In another embodiment, the threshold value 23 can be adjusted to, for example, the load level of the dishwashing tray 13. If the weight of the dishwashing tray 13 is increased, a higher motor current I3' is required to move the dishwashing tray 13. To prevent the detection unit 19 from falsely detecting a blockage, the threshold value 23 is advantageously increased.

[0062] In another embodiment, the threshold value 23 can have a value that changes over time, as in the Fig. 5 As shown, due to an excessively rapid increase in the motor current I3" during the time difference t3, the threshold value 23 may be reduced. This is because a user request to stop or a blockage is associated with a very abrupt and therefore rapid increase in the motor current I3.

[0063] The Fig. 5 The graph continues to show a motor current curve I with a lower rise I3‴ and an increased threshold 23, so that an increased motor current I2' is tolerated by the detection unit 19. One reason for this could be, for example, the starting of the electric motor 16 and the associated increased current draw. To account for the rise of the motor current I3 in the threshold 23, the threshold 23 is defined, for example, as a function of a time derivative of the motor current I.

[0064] In another embodiment, a control system for the electric motor 16 includes a position control loop 24, which is located in the Fig. 6 This is illustrated. The control system compares a setpoint SW with an actual value IW. The control parameter – here the actual value DW – is adjusted by the control system to minimize the difference DW between the setpoint SW and the actual value IW. The setpoint SW could, for example, be a target position of the dishwashing tray 13. The actual value IW could, for example, be an actual position s of the dishwashing tray 13. The position control loop from the Fig. 6 The control unit 18 comprises the Fig. 2 , which derives the motor current I of the electric motor 16 from the Fig. 2 The control loop regulates the position of the workpiece. The workpiece holder 13 is then extended from the wash tank 2, covering a distance s. The position of the workpiece holder 13 is determined, for example, via this distance s. The position of the workpiece holder 13 is returned to the position control loop 24 as the actual position IW or s, where it is compared with the target value SW.

[0065] Due to the external force 21 (arrow) from the Fig. 2 The difference DW between the target position SW and an actual position IW cannot be minimized by the position control loop 24 and even increases. To enable the detection unit 19 to recognize a blockage or a stop request, the threshold value 23 can, for example, be defined as a function of the difference DW.

[0066] In the Fig. 7 The time course of a motor current I during the start-up of the dishwashing tray 13 is shown. The start-up phase s3 is described by a start position s1 and a final start position s2. During the start-up s3 of the dishwashing tray 13, the motor current I is increased. To avoid falsely identifying a blockage and to ensure that the external force 21 (arrow) is applied over the entire extension length 25 ( Fig. 2 To keep the current of the dishwashing tray 13 constant, the threshold value 23 depends on both the motor current I and a reference position of the dishwashing tray 13. The reference position has a fixed or variable value over time. The reference position can be a position of the dishwashing tray 13 along the entire extension length 25, for example, the approach position s1, such as at half the extension length.

[0067] As in the Fig. 7 As shown, the motor current I is limited by the threshold value 23. The threshold value 23 depends on the motor current I and the position of the dishwashing tray 13, where the position is determined by the extension path s of the dishwashing tray 13 and exhibits a similar curve to the motor current I. The difference between the threshold value 23 and the motor current I remains constant. This difference corresponds to an additional motor current required to overcome the external force 21 (arrow).

[0068] The Fig. 8 shows the time course of a motor current I from the Fig. 7 upon exceeding the threshold value of 23 from the Fig. 7 during the start-up phase s3 of the dishwashing process. This allows blockages and start-up requests to be detected during the start-up phase s3.

[0069] The Fig. 9 Figure 1 shows the steps of a procedure for operating a household dishwasher. In a first step S1, the dish holder 13 is moved by means of the electric motor 16. The electric motor 16 has at least one motor parameter I and is controlled depending on at least one control parameter s. In a second step S2, the blockage of the dish holder 13 or the user's stop request is controlled depending on the motor parameter I or the control parameter s. In a third step S3, the electric motor 16 is decoupled from the dish holder 13 or switched off depending on the detected blockage or the detected stop request.

[0070] In another embodiment, the dishwasher 1 can have a machine learning unit (not shown) configured to determine the threshold value 23 based on training data sets. The threshold value 23 can, for example, be defined once or continuously with new data sets.

[0071] Although the present invention has been described using exemplary embodiments, it can be modified in many ways. Verwendete Bezugszeichen

[0072] 1 Household dishwasher 2 Wash tub 3 Door 4 Wash chamber 5 Swivel axis 6 Loading opening 7 Floor 8 Ceiling 9 Back panel 10 Side panel 11 Side panel 12 Dishwasher holder 13 Dishwasher holder 14 Dishwasher holder 15 Telescopic extension 16 Electric motor 17 Element 18 Control unit 19 Detection unit 20 Switching unit 21 Force (arrow) 22 Force (arrow) 23 Threshold 24 Control loop 25 Extension length AExtension direction (arrow) DWDifference EInsertion direction (arrow) IMotor current I1 - I6Motor current IWIActual value; Actual position S1First step S2Second step S3Third step SWTarget value; Target position sExtension path; Actual position s1Position s2Position s3Acting phase tTime t1Time t2Time t3Time

Claims

1. Household dishwasher (1) with a dishwasher cavity (2), a receptacle for items to be washed (4), which can be shifted into and at least partially out of the dishwasher cavity (2), an electric motor (16), which has at least one motor parameter (I), wherein, in a driving state, the electric motor (16) shifts the receptacle for items to be washed (12, 13, 14) into or at least partially out of the dishwasher cavity (2) and, in a free-running state, is decoupled from the receptacle for items to be washed (12, 13, 14) and / or disconnected from the power supply, and / or a regulating unit (18), which, at least in the driving state, is configured to regulate the electric motor (16) as a function of at least one regulating parameter (s), characterised in that - a detection unit (19) is provided, which is configured to detect a blockage of the receptacle for items to be washed (12, 13, 14) and / or a stop request of a user as a function of the at least one regulating parameter (s) and / or a motor parameter (I), and - a switching unit (20) is provided, which is configured to switch the electric motor (16) into the free-running state as a function of the detected blockage or the detected stop request.

2. Household dishwasher (1) according to claim 1, characterized in that the detection unit (19) detects the blockage and / or the stop request as a function of a comparison (DW) of the motor parameter (I) with a threshold value (23).

3. Household dishwasher (1) according to claim 2, characterized in that the threshold value (23) has a value which is fixed or variable over time.

4. Household dishwasher (1) according to claim 3, characterized in that the variable value is dependent on the motor parameter (I).

5. Household dishwasher (1) according to claim 1, characterised in that the regulation of the electric motor (16) comprises a comparison (DW) of a target value (SW) with an actual value (IW), wherein the regulating parameter (s) is equal to the target value (SW) or the actual value (IW) and the detection unit (19) detects the blockage and / or the stop request as a function of the comparison (DW).

6. Household dishwasher (1) according to claim 5, characterised in that the target value (SW) is a target position and the actual value (IW) is an actual position of the receptacle for items to be washed (12, 13, 14).

7. Household dishwasher (1) according to one of claims 4 to 6, characterised in that a further parameter is determined as a function of an actual position (IW) of the receptacle for items to be washed (12, 13, 14) relative to a reference position of the same.

8. Household dishwasher (1) according to claim 7, characterised in that the reference position has a value which is fixed or variable over time.

9. Household dishwasher (1) according to claim 8, characterised in that the variable value corresponds to the reference position of a respective start-up position (s1) of the receptacle for items to be washed (12, 13, 14).

10. Household dishwasher (1) according to claim 9, characterised in that one of the respective start-up positions (s1) is a half extraction length (25).

11. Household dishwasher (1) according to one of the preceding claims, characterised in that, in the free-running state, a mechanical coupling element decouples the receptacle for items to be washed (12, 13, 14) from the electric motor (16) or the electric motor (16) is disconnected from the power supply.

12. Household dishwasher (1) according to one of the preceding claims, characterised in that the receptacle for items to be washed (12, 13, 14) can be shifted into or at least partially out of the dishwasher cavity (2) with the aid of a telescopic extension (15), wherein the electric motor (16) is configured to drive an element (17) of the telescopic extension (15) for shifting the receptacle for items to be washed (12, 13, 14).

13. Household dishwasher (1) according to one of the preceding claims, characterised in that the electric motor (16) is a permanent-magnet synchronous motor.

14. Method for operating a household dishwasher (1), with the following steps: a) shifting (S1) a receptacle for items to be washed (12, 13, 14) with the aid of an electric motor (16), which has at least one motor parameter (I) and / or is regulated as a function of at least one regulating parameter (s); b) detecting (S2) a blockage of the receptacle for items to be washed (12, 13, 14) or a stop request of a user as a function of the motor parameter (I) or the regulating parameter (s); and c) decoupling (S3) the electric motor (16) from the receptacle for items to be washed (12, 13, 14) or disconnecting the electric motor (16) from the power supply as a function of the detected blockage or the detected stop request.

Images