Knob for operating a device

Abstract

The invention relates to a knob (3) for operating devices (2), in particular for operating devices (2) of a domestic appliance (1), having a central connection element (28) for holding the knob (3) on a surface (8) of the operating device (2), the connection element (20, 21, 24) being arranged in the region of the axis of the knob (3), which serves as an axis of rotation (14) when the knob (3) is in use as intended, the knob further having a permanent magnet assembly (16) which is arranged in an annular region (15) surrounding the axis of rotation (14) of the knob (3) and is configured to provide a permanent magnetic field at least in an annular space (17) which encompasses the annular region (15) and extends parallel to the axis of rotation (3) at least as far as the surface (8). According to the invention, the permanent magnet assembly (16) has a first permanent magnet (22) of annular configuration and is configured to provide a permanent magnetic field having a magnetic flux density which varies in the peripheral direction about the axis of rotation (14).

Description

Technical Field

[0001] This invention relates to a knob for an operating device, particularly for an operating device of a household appliance, the knob having a central connecting element for holding the knob on a surface of the operating device, wherein the connecting element is arranged in a region of the knob's axis, the axis serving as a rotation axis when the knob is used as intended. The knob also has a permanent magnet assembly arranged in an annular region surrounding the rotation axis of the knob and configured to provide a permanent magnetic field at least in an annular space containing the annular region, the annular space extending parallel to the rotation axis at least to said surface. The invention also relates to an operating device for a household appliance having a knob, a surface configured to hold the knob, a magnetic field sensor, and a control unit connected to the magnetic field sensor via signal technology, the control unit providing at least one control signal for the household appliance. Finally, the invention also relates to a household appliance having an operating device. Background Technology

[0002] Knobs for operating devices, operating devices for household appliances, and household appliances having operating devices are well known in the prior art, and therefore no separate written proof is necessary. In particular, operating devices are known to have knobs that can be detached from and reattached to a surface or operating element without damage. Such knobs are typically held on the surface by means of a magnetically retaining handle.

[0003] Operating devices with knobs can be used in household appliances such as stoves and ovens for food preparation, as well as in appliances such as dishwashers, washing machines, and dryers. Knobs can be configured to rotate only, except when attached to or removed from a surface. Manual operation of the knob allows for specific settings of the appliance's functions, for example. In a stove, this could be, for example, selecting a cooking zone, setting the power of the selected cooking zone, and / or similar settings.

[0004] Furthermore, operating devices are also known in which the knob can be tilted, for example, alternatively or additionally. This allows for additional function settings for household appliances.

[0005] For example, WO2009 / 065704A2 discloses an operating device for a household appliance. This operating device includes a knob that can be magnetically positioned or held on the surface of an operating device integrated into a stovetop. The knob, when mounted on the surface, can be both rotated and tilted.

[0006] Furthermore, DE 102012001997 A1 discloses an operating device for an electronic appliance. This operating device also includes a knob that can be detachably attached to the surface of a component of the electronic appliance and can be rotated and tilted manually. Different types of sensors are provided in DE 102012001997 A1 for different types of operation.

[0007] While existing technologies have proven effective, further improvements are still needed. In particular, for detecting manual operation of knobs, and especially the types of manual operation, setting up separate, expensive sensor systems for different types of manual operation has proven disadvantageous. Furthermore, it has proven disadvantageous that this limits the flexibility of the operating device. Adapting or standardizing the operating device in this way is virtually impossible. Moreover, the achievable resolution of the control signals derived from the sensor signals of the magnetic field sensor is also limited. Summary of the Invention

[0008] The purpose of this invention is to improve a knob, an operating device, and a household appliance, particularly to improve the detection of different types of manual operation.

[0009] As a solution, this invention provides a knob, an operating device, and a household appliance according to the independent claims.

[0010] Advantageous improvements can be derived from the features of the dependent claims.

[0011] Regarding the type of knob, the present invention proposes in particular that the permanent magnet assembly has a first permanent magnet with a ring structure and is configured to provide a permanent magnetic field having different magnetic flux densities in the circumferential direction about the axis of rotation, particularly successively varying magnetic flux densities or magnetic polarities in opposite directions.

[0012] Regarding the operating device of the category, it is particularly proposed by the present invention that the knob is constructed according to the present invention.

[0013] Regarding household appliances of this category, it is particularly proposed that the operating device is constructed according to the invention.

[0014] This invention is primarily based on the idea that by evaluating the sensor signals of the magnetic field sensor, particularly all sensor signals related to the knob, it is possible to avoid using separately adapted sensors for different manual operation types of the knob. Here, the invention utilizes the understanding that sensor signals can already contain information about different manual operation types. This information can be obtained through adaptation evaluation, allowing the corresponding manual operation type to be determined based on this information. Therefore, unlike in the prior art, in order to determine the different manual operation types of the knob, separate, spatially separated sensor groups are no longer necessary in this invention.

[0015] Preferably, the knob can be detachably attached to the surface. However, it can also be configured such that the knob is attached to the surface in a way that it cannot be removed from the surface, but preferably not in a rotationally resistant manner. The types of manual operation of the knob may include, for example, rotating the knob while it is held on the surface, tilting the knob while it is held on the surface, attaching the knob to the surface and / or removing the knob from the surface (if the knob can be detachably attached to the surface), and / or similar operations.

[0016] Therefore, a knob can, of course, be detachably connected to a surface by means of a mechanical connecting device, for example, by way of a knob having a pin or bolt that can be inserted into a receiving opening in the surface or component. The receiving opening can also be provided, for example, by a connecting unit arranged on the surface. The connecting unit can be detachably connected to the surface. Preferably, the knob is held to the surface of the appliance component by means of magnetic force. This can be used in place of or as an addition to the connecting unit. This allows the knob to be easily removed from or attached to the surface. However, it can also be configured such that the knob can be attached to a mechanical pin-shaped or bolt-shaped element fastened to the surface. The holding force can be achieved in this case, for example, by a detachably locking mechanical connector. This also allows for detachable retention of the knob on the surface. Of course, there can be other designs or combinations regarding the detachable or non-detachable retention of the knob on the surface, especially in the sense of kinematic reversal. Therefore, considerations for knobs detachably retained on a surface also apply to knobs that are non-detachably retained on a surface without damage.

[0017] The component providing the surface for holding the knob is preferably a component of the operating mechanism. However, it can also be, for example, a component of a household appliance and, for example, arranged on or integrated into the housing of the appliance. It can also be a separate component, which is mechanically connected or linked to the household appliance itself. Preferably, the component is part of the household appliance, but at least part of the operating mechanism. However, it can also be a separate component, for example, connected to the housing, particularly in the area of ​​the outer surface of the housing. Therefore, the component can of course also be integrated into the housing of the household appliance. The component can be constructed, for example, as a flat, planar component, which is preferably constructed as a panel. It is particularly advantageous that the surface is constructed to be non-curved. The component can preferably have a material that, when the knob is mounted on or held on the surface, does not affect the permanent magnetic field of the knob as much as possible. Thus, even if a magnetic field sensor detects a permanent magnetic field passing through the component, the magnetic field sensor can reliably detect the permanent magnetic field of the knob. This can be done, for example, when the magnetic field sensor is arranged on the side of the component opposite the knob held on the surface. Therefore, the knob can be arranged on the outside of the household appliance, while the corresponding magnetic field sensor is arranged on the inside of the household appliance, especially the housing of the household appliance.

[0018] When used as intended, the knob is in a state of connection with the surface. However, use as intended may also include removing the knob from the surface and / or attaching the knob to the surface.

[0019] Preferably, the knob has at least a partially cylindrical structure, wherein the outer diameter of the knob is advantageously greater than the height of the knob along its axis of rotation. The knob may, for example, have a generally disc-shaped outer profile.

[0020] In many applications, the knob can be positioned next to the display unit of the operating device. Preferably, the display unit can display a setting value, which can be set or has already been set by means of the knob.

[0021] Manual operation of the knob causes movement of the knob relative to the surface. The surface and components are preferably in a predetermined, unchanging position, at least during manual operation of the knob. This also preferably applies to the magnetic field sensor. Therefore, when detecting the permanent magnetic field of the knob by the magnetic field sensor, the movement of the knob and the resulting changes can be determined by evaluating the sensor signal.

[0022] The magnetic field sensor can be formed, for example, by means of a suitable coil, Hall sensor, and / or similar device. Preferably, the magnetic field sensor is constructed substantially the same. The magnetic field sensor is connected to a control unit via signal technology, for example, by means of electrical connection to the control unit. The control unit is preferably an electronic control unit, which may at least partially have electronic hardware circuitry and / or a computing unit, which can be controlled by means of a computer program. The control unit is configured to evaluate the sensor signal provided by the magnetic field sensor and, based on the evaluation, provide at least one control signal for the household appliance. The control signal enables functional control of the household appliance's controlled elements. When a stove is used as a household appliance, the controlled element may, for example, be the heating control of the cooking zone of the stove. When an oven is used as a household appliance, it may, in this case, be, for example, an oven heater, a fan, and / or similar devices. The magnetic field sensor can be mechanically connected to a component, particularly its surface. It is particularly advantageous for the magnetic field sensor to be mechanically connected to the component. The magnetic field sensor is preferably arranged substantially on a circle, the center point of which roughly corresponds to the axis of rotation of a knob when it is held on a surface, particularly when the knob is not manually operated. The magnetic field sensors can be arranged equidistantly about the center point. Preferably, the magnetic field sensors are arranged substantially within a ring-shaped area. It is particularly advantageous that the magnetic field sensors are arranged substantially equidistantly in the circumferential direction. However, they can be arranged differently as needed.

[0023] The control signal is preferably an electronic control signal. The control signal can be used to control electronic switching devices or control devices, thereby enabling the controlled element to occupy the desired operating state.

[0024] While held on the surface, the knob can, for example, rotate about a rotation axis. Furthermore, it can be configured to tilt relative to the rotation axis. In an annular region surrounding the knob's rotation axis, the knob provides a permanent magnetic field. For this purpose, a permanent magnet assembly, which may have one or more permanent magnets, is arranged in the annular region. The permanent magnetic field has at least one magnetic field component parallel to the rotation axis. Thus, the permanent magnetic field can be detected particularly well by a magnetic field sensor, especially when the magnetic field sensor is arranged axially spaced from the knob. Preferably, the permanent magnetic field of the knob is oriented substantially completely parallel to the rotation axis. The permanent magnetic field extends towards the surface in the annular space while the knob is held on the surface. Thus, the permanent magnetic field can be detected particularly well by a magnetic field sensor. Depending on the detected permanent magnetic field, the magnetic field sensor provides a corresponding sensor signal.

[0025] The permanent magnetic field has different magnetic flux densities, or consecutively different magnetic flux densities, in the circumferential direction about the axis of rotation. The permanent magnetic field can, for example, have opposite magnetic polarities. Different or alternating magnetic flux densities or alternating magnetic polarities can be selected as needed. Preferably, at least four alternating magnetic flux densities or alternating magnetic polarities are provided. However, depending on the needs, the alternating magnetic flux densities or alternating magnetic polarities can be chosen to be almost any size. For this purpose, a ring magnet can be provided, for example, to provide a corresponding number of alternating magnetic flux densities or magnetic poles. Alternatively, multiple individual magnets can be provided, for example, arranged correspondingly in the circumferential direction of the ring region. Other designs and combinations are also considered.

[0026] The control unit preferably includes an evaluation unit configured to evaluate sensor signals, thereby determining the manual operation type of the knob. For this purpose, the evaluation unit is preferably connected to all magnetic field sensors via signal technology and configured to determine a predetermined manual operation type of the knob based on the sensor signals. For example, the evaluation unit may be configured to determine the rotation of the knob. Furthermore, the evaluation unit may be configured to determine whether the knob is attached to or removed from a surface if it is detachably mounted on the surface. However, the evaluation unit may also be configured to determine the tilt of the knob while it is held on the surface. Therefore, the evaluation unit is adapted to the desired operation of the knob. The evaluation unit can provide one or more corresponding evaluation signals, which can be processed by the control unit. The control unit can then obtain at least one control signal based on the determined manual operation type of the knob; for this purpose, the control unit preferably considers the evaluation signals.

[0027] Therefore, unlike existing technologies, it is no longer necessary to set different sensors or sensor groups for different manual operation types of the knob. Instead, the manual operation type can be determined using a single sensor group consisting of a magnetic field sensor by specifically evaluating the sensor signals of the magnetic field sensor, particularly all sensor signals of the magnetic field sensor at a defined time point, or similar methods. This reduces the cost of the sensing devices and the knob itself, while also improving reliability. Furthermore, this invention enables improved resolution, particularly regarding the rotation and / or tilting of the knob. In existing technologies, sensor signals are generated specifically for the operation type. This means that sensor signals are detected specifically for a given manual operation type. Such sensor signals are therefore generally unusable for determining multiple manual operation types. Therefore, unlike this invention, existing technologies also use specific sensor systems for specific manual operation types.

[0028] The central connecting element is primarily used to enable the knob to be movably connected to the surface, thereby allowing the knob to be held on the surface.

[0029] The annular space preferably extends not only to the surface but also through it, particularly into the area where the magnetic field sensor is located. This enables the detection of a permanent magnetic field passing through the component by means of the magnetic field sensor.

[0030] Furthermore, it is proposed that the permanent magnet is magnetized parallel to the axis of rotation using a first magnetization method, wherein the permanent magnet assembly has at least one second permanent magnet with a ring-shaped structure, the second permanent magnet being magnetized parallel to the axis of rotation using a second magnetization method, the second magnetization method being oriented in the same or opposite manner to the first magnetization method, wherein at least one second permanent magnet is arranged radially adjacent to the first permanent magnet about the axis of rotation. Preferably, at least one second permanent magnet is directly arranged on the first permanent magnet, and particularly preferably the second permanent magnet is even in contact with the first permanent magnet. In the case of opposite orientation of the second magnetization methods, the two permanent magnets can be held together by magnetic force. Otherwise or additionally, other or additional connecting devices, such as adhesive connectors, clamping connectors, and / or similar connectors, can be provided. This allows the first and at least one second permanent magnet to be held in a fixed position relative to each other. An integral structure with corresponding molding and corresponding magnetization, made of plastic bonded rare earth or plastic bonded hard ferrite produced by injection molding technology, can also be provided, thereby achieving a low-cost design. The permanent magnet assembly enables the provision of alternating magnetic flux density, such as locally enhanced or locally weakened magnetic flux density, in a simple manner. Furthermore, it enables designs with opposite magnetic polarities. This design allows the manual operation type of the knob to be determined using only a single magnetic field sensor assembly. Therefore, it eliminates the need for a single annular permanent magnet with different magnetization directions in the circumferential direction about the axis of rotation. Instead, almost arbitrary magnetization designs can be achieved in a simple manner, enabling standardization. Thus, the knob can be easily manufactured using standard components to suit the most diverse applications. The knob according to the invention not only allows for the simple determination of different manual operation types but also provides high flexibility in its manufacturing. Therefore, the knob of the invention can be easily adapted to the most diverse applications. Depending on the requirements, instead of providing only a single second permanent magnet, multiple second permanent magnets can be provided to achieve a near-flexible design of the knob's permanent magnetic field.

[0031] Furthermore, it is proposed that at least one second permanent magnet extends about the axis of rotation in the circumferential direction at a preset angle. This allows for a simple determination of how changes in magnetic flux density or magnetic polarity alternation occur in the circumferential direction. This can be adjusted according to the specific application. For example, the angle can be approximately 30° to approximately 80°, preferably approximately 45° to approximately 70°, and particularly preferably approximately 60°. The preset angle can be selected based on the magnetic flux density of the permanent magnetic field or the number of magnetic polarity alternations. The angle can also be selected based on the number of second permanent magnets.

[0032] Advantageously, the first permanent magnet and at least one second permanent magnet have approximately equal axial extension lengths about the axis of rotation. This allows for a knob with a relatively small mounting height. Therefore, the knob can be designed in accordance with ergonomic principles. In particular, this allows for the preset orientation of the magnetic flux of the permanent magnetic field. This is beneficial for detection by a magnetic field sensor.

[0033] Furthermore, it is proposed that the first permanent magnet and at least one second permanent magnet have radial extension lengths that are equal about the axis of rotation. This allows for other design advantages regarding the knob. Therefore, the radial extension lengths do not need to be equal. Depending on the design, it is advantageous for the radial extension lengths to be different from each other. However, from a manufacturing point of view, it is advantageous that the radial extension lengths are preferably constructed to be substantially equal.

[0034] It is also proposed that the first permanent magnet and at least one second permanent magnet provide the same angle-specific magnetic flux. This allows for the realization, in the region where the second permanent magnet is arranged, either an increase in magnetic flux can be achieved under the condition of a magnetic field with the same orientation, or compensation of the magnetic flux of the first permanent magnet can be achieved through at least one second permanent magnet under the condition of magnetic fields with opposite orientations. Thus, at this point, the magnetic field sensor essentially either detects the increased magnetic flux, or detects no magnetic flux, or only a very small magnetic flux. Under the condition of magnetic fields with opposite orientations, near-complete magnetic flux cancellation can be achieved in this region. This is advantageous for detecting permanent magnetic fields and, consequently, for determining the type of manual operation during the evaluation process.

[0035] According to one improvement, the permanent magnet assembly has at least two second permanent magnets arranged radially adjacent to the first permanent magnet about the axis of rotation, wherein the at least two second permanent magnets are spaced apart from each other about the axis of rotation in the circumferential direction at a preset angle. This improvement allows for multiple flux variations or polarity alternations of the permanent magnetic field in the circumferential direction. This can be achieved by virtually arbitrarily increasing the number of second permanent magnets. The preset angles are preferably chosen to be substantially equal in the circumferential direction regarding the corresponding spacing of the second permanent magnets. However, this can be varied depending on the needs.

[0036] Preferably, at least two second permanent magnets are radially spaced equally from the axis of rotation. This allows for at least one regional symmetry of the magnetic field in the radial direction, thus enabling the annular region to be kept as narrow as possible in the radial direction. This can be advantageous for detecting the permanent magnetic field by a magnetic field sensor. The magnetic field sensor therefore only needs to be arranged in the region of the annular space, which includes the annular region. Furthermore, rotational symmetry can also be achieved, particularly regarding the imbalance of the knob with respect to rotation.

[0037] Furthermore, it is proposed that the central connecting element has at least one central magnet. The central connecting element can therefore be used to hold the knob on the surface by means of magnetic force. For this purpose, a magnet can also be disposed opposite each other in a region of the component, particularly in its surface; this magnet can be configured, for example, as a central magnet or as an electromagnet. Of course, combinations of these magnets can also be used.

[0038] Furthermore, it is proposed that the knob has a stator unit and a rotor unit, with the rotor unit movably connected to the stator unit, wherein a permanent magnet assembly is arranged in the rotor unit. The advantage of this design is that the knob does not need to generate frictional contact with the surface due to rotation. Instead, this is achieved through the stator unit, which can fix the knob to the surface, without the surface itself being affected by mechanical stress due to frictional movement or similar motion. Conversely, a rotational support can be provided on the knob side by providing a corresponding support for the rotor unit on the stator unit. Of course, a detachable or non-detachable connection can also be provided, allowing corresponding rotation and / or corresponding tilting. The same implementation methods previously explained for the knob as a whole also apply to the connection between the stator unit and the surface.

[0039] It is also proposed that the central connecting element is at least partially arranged in the stator unit or the rotor unit. Specifically, when the central connecting element is formed by one or more central magnets, it can be configured such that at least one of the central magnets is arranged in the stator unit and at least one of the central magnets is arranged in the rotor unit. Thus, the rotor unit and the stator unit can be connected by magnetic force on the knob side as well. However, a fixed mechanical connection can also be provided, for example, using suitable bearings or a similar method.

[0040] Furthermore, it is proposed that, in the case where the second magnetization method is designed to be opposite to the first magnetization method, the central connecting element has at least one central magnet, the magnetization method of which corresponds to the second magnetization method. This design enables the magnetization of the first permanent magnet and the magnetization of the central magnet to be superimposed, especially when a magnetic circuit is constructed or arranged in the knob opposite to the surface. This not only improves the holding function but also improves the determination of the knob's manual operation type by improving the detection of the permanent magnetic field.

[0041] Particularly advantageous is that the stator and rotor units are configured to be detachably connected to each other. This design has proven particularly advantageous in household appliances, for example, to ensure the reliable function of knobs over a long period. Thus, the stator unit can be easily separated from the rotor unit to facilitate the removal of stains or similar substances, for example. Simultaneously, the rotor and stator units can also be easily rejoined, enabling simple operation. Particularly advantageous is that the central connecting element is formed by one or more central magnets.

[0042] The advantages and effects described with respect to the knob according to the invention also apply equally to operating devices equipped with the knob according to the invention and to household appliances equipped with operating devices according to the invention, and vice versa.

[0043] Other features of the invention are derived from the claims, drawings, and description of the drawings. Features and combinations of features mentioned above in the specification, and features and combinations of features mentioned below in the description of the drawings and / or shown separately in the drawings, can be applied not only in the corresponding described combinations, but also in other combinations without departing from the framework of the invention. Therefore, embodiments not explicitly shown or explained in the figures, but arising from individual combinations of features in the explained embodiments, should be considered as embodiments included and disclosed by the invention. Embodiments and combinations of features that do not possess all the features of the initially proposed independent claims should also be considered as disclosed. Furthermore, various embodiments and combinations of features, especially those described above, that go beyond or deviate from the combinations of features listed in the reference relationships of the claims, should also be considered as disclosed. Attached Figure Description

[0044] Figure 1 A schematic perspective view of a stove with operating devices is shown;

[0045] Figure 2 The arrangement of the operating device is shown according to Figure 1 A schematic cross-sectional view of the knobs on the surface of a stove component;

[0046] Figure 3 It shows that according to Figure 1 and 2 A schematic cross-sectional view of a knob, wherein the rotor unit of the knob is shown above the stator unit;

[0047] Figure 4 It shows that according to Figure 1 and 2 A schematic perspective exploded view of the knob;

[0048] Figure 5 It shows that according to Figures 2 to 4 A schematic perspective view of the permanent magnet assembly of the knob;

[0049] Figure 6 A schematic perspective view of the printed circuit board of the operating device is shown, which includes a magnetic field sensor as part of the operating device for a stove used in the domestic field.

[0050] Figure 7 The permanent magnet assembly of the knob in the first rotational position is shown, and according to... Figure 2 A schematic diagram of the magnetic flux density in a segment of the annular space between the magnetic field sensors;

[0051] Figure 8 The second rotational position of the knob is shown as follows. Figure 7 Such a diagram;

[0052] Figure 9 A schematic diagram showing the signal flow when the knob is tilted is shown;

[0053] Figure 10 A schematic diagram showing the signal flow when the knob is rotated is shown. Detailed Implementation

[0054] Figure 1 The schematic perspective view shows a cooking appliance or stove 1, which represents a household appliance. However, in alternative designs, the household appliance could also be, for example, an oven, a steam cooking appliance, a microwave cooking appliance, or a dishwasher, washing machine, dryer, or similar equipment.

[0055] The stove 1 has a stove panel 10, on which cooking zones 4, 5, 6, and 7 are formed. Furthermore, the stove 1 has an operating device 2. The operating device 2 has a knob 3 and a surface 8 for holding a member 9 of the knob 3. The member 9 is currently constructed as a glass-ceramic window integrated into the stove panel 10. The member 9 is therefore essentially panel-shaped and fixedly connected to the stove panel 10. The member 9 has an outer side surface that provides the surface 8. Additionally, the member 9 has an inner side surface 19, which will be further described below.

[0056] The knob 3 can be detached from the surface 8 without damage and can be removed again. In the current embodiment, the knob 3 is generally disc-shaped or cylindrical, wherein the outer diameter of the knob 3 transverse to the axis of rotation 14 of the knob 3 is greater than the height of the knob 3 in the direction of the axis of rotation 14. In alternative designs, it may be configured differently.

[0057] The lower side of the knob 3 facing the surface 8 is designed or shaped such that the knob 3 can be tilted or rotated manually while it is positioned on the surface 8. The operating function of the stove 1 can be selected and / or set by the relative movement of the knob 3 relative to the surface 8 while it is positioned on the surface 8. This relative movement of the knob 3 can be, for example, a rotational movement of the knob about its rotation axis 14. Alternatively or additionally, a tilting movement relative to the surface 8 can also be provided.

[0058] The operating device 2 preferably also includes an electronic display field 27, which is capable of forming an associated and therefore uninterrupted surface with the surface 8. Figure 6 The display field can be used to visually show the user the operating status and / or settings of the stove 1. This could be, for example, a setting value for the heating power of one of the cooking zones 4 to 7, or a similar value.

[0059] Below cooking zones 4 to 7, radiant heaters, induction heaters, and / or similar elements can be arranged as controlled components to provide the required heating to the cookware arranged in one of the respective cooking zones 4, 5, 6, and 7. However, this is not shown in the figure.

[0060] Operating device 2 is connected to control unit 12, which provides corresponding control signals to cooking zones 4 to 7, thereby enabling the setting of the required heating power for the respective cooking zones 4 to 7 according to the settings that can be made using knob 3. Corresponding control elements can be provided for this purpose, but these are not shown in the figure.

[0061] Figure 2 The operating device 2 is shown in a schematic cross-sectional view. From Figure 2As can be seen, the knob 3 is mounted on the surface 8 of the glass-ceramic window 9. The knob 3 has a central magnet 21 on the knob side, which, in the mounted state, is opposite to a central magnet 20 arranged in the area of ​​the inner side 19. The central magnets 21 and 20 are used to hold the knob 3 in the desired position, so that the desired settings on the stove 1 can be made by manually operating the knob 3.

[0062] In this design, the knob 3 is configured to have a stator unit 25 and a rotor unit 26 that can be movably connected to the stator unit 25. This is in Figure 3 A schematic cross-sectional view of knob 3 is shown. The rotor unit 26 is not directly mounted on surface 8, but instead is mounted on the stator unit 25, which serves as a retaining unit, and the stator unit itself is connected to surface 8. In the current design, this connection is constructed to be detachable. The stator unit 25 also has a central magnet 24, which further assists in the retaining function of knob 3. Of course, the central magnets 20, 21, and 24 are arranged approximately concentrically with the axis of rotation 14.

[0063] The knob 3 has a permanent magnet assembly 16 arranged in an annular region 15 surrounding the rotation axis 14 of the knob 3 and configured to provide a permanent magnetic field at least in an annular space 17 including the annular region 15, which extends parallel to the rotation axis 3 to at least the surface 8. The permanent magnet assembly 16 is configured to provide a permanent magnetic field with a continuously varying magnetic flux density in the circumferential direction about the rotation axis 14, as will be further described below.

[0064] Figure 4 An exemplary configuration of knob 3 is shown in a schematic perspective exploded view of knob 3. From Figure 4 As can be seen, the knob 3 has a knob housing 60, and the permanent magnet assembly 16 is inserted into the knob housing.

[0065] Figure 5A schematic perspective view of the permanent magnet assembly 16 is shown. As can be seen, the permanent magnet assembly 16 has a first permanent magnet 22 with a ring-shaped structure, which is magnetized parallel to the rotation axis 14 using a first magnetization method. Furthermore, in this design, the permanent magnet assembly 16 has three second permanent magnets 18 with a ring-shaped structure, which are magnetized parallel to the rotation axis 14 using a second magnetization method, opposite to the first magnetization method. In an alternative configuration, the first magnetization method can also be configured in the same direction as the first magnetization method, thereby achieving localized magnetic field enhancement, or an increase in magnetic flux density. The three second permanent magnets 18 are arranged radially adjacent to the first permanent magnet 22 about the rotation axis 14. Thus, the permanent magnet assembly 16 provides a permanent magnetic field with a continuously varying magnetic flux density in the circumferential direction about the rotation axis 14 within the ring-shaped space 17. Depending on the magnetization methods of the first and second permanent magnets 18, 22, in an alternative design, alternation of the permanent magnetic field polarity in the circumferential direction about the rotation axis 14 can also be achieved.

[0066] This provides a permanent magnetic field, which has a magnetic field component that is substantially parallel to the axis of rotation 14. This magnetic field component extends toward surface 8 in the annular space 17 while the knob 3 is held on surface 8.

[0067] from Figure 2 As can also be seen, a printed circuit board 11 is arranged opposite to the inner surface 19, and in this design, the printed circuit board surrounds the central magnet 20. This can also be designed differently in alternative embodiments. The printed circuit board 11 currently carries eight magnetic field sensors 13, which are essentially arranged in the annular space 17, thereby enabling them to detect the permanent magnetic field of the permanent magnet assembly 16 of the knob 3, particularly when mounted on surface 8. The knob 3 provides a permanent magnetic field with a continuously varying magnetic flux density in the circumferential direction about the rotation axis 14. In this design, there is no polarity alternation in the circumferential direction. However, the invention is not limited to this. The magnetic field sensors 13 detect the magnetic field and provide corresponding sensor signals, particularly based on the detection of the permanent magnetic field in the annular space 17.

[0068] from Figure 4 As can also be seen, the permanent magnet assembly 16 is constructed as a disc covered by a metal sheet, which is formed of a magnetizable material and forms a yoke 29. The button housing 60 is closed by means of a button cover 61. This provides the rotor unit 26. Furthermore, the rotor unit 26, and in particular the button housing 60, is mounted on the receiving ring 63 of the stator unit 25. The receiving ring 63 itself is held by the retaining foot 64 of the stator unit 25. The retaining foot 64 and the button housing 60 respectively have central magnets 21 and 24. Figure 4 The components of the knob 3 shown can be attached to or removed from the surface 8. In particular, the rotor unit 26 can be removed from the retaining foot 64.

[0069] The stator unit 25 has a housing for receiving a central magnet 24 configured as a cylindrical magnet. The bottom surface of the stator unit 25 may be made of a hard plastic component or a dual-component component with a soft component, and it is attached to the cooktop panel 10, particularly the glass-ceramic window 9.

[0070] The rotor unit 26 has a housing in which an axially magnetized central magnet 21, configured as a cylindrical magnet, is arranged at the center. The contact surface between the rotor unit 26 and the stator unit 25 is slightly tapered on one side. This allows the rotor unit 26 to rotate well. The rotor unit 26 can be tilted relative to the stator unit 25.

[0071] The current configuration involves the permanent magnet assembly 16 providing a continuously varying magnetic flux density in the circumferential direction, thereby providing a modulated magnetic field in the region of the toroidal space 17 in the circumferential direction. Based on the distance between the permanent magnet assembly 16 and the correspondingly arranged magnetic field sensor 13, the magnetic flux density detected by the magnetic field sensor 13 does not exhibit abrupt jumps between minimum and maximum values, but instead forms a continuous transition. The system is optimized to achieve an approximately sinusoidal trend in the magnetic flux density in the circumferential direction. Figure 10 This situation is illustrated. Currently, the Hall sensor is configured as the magnetic field sensor 13. However, the invention is not limited thereto.

[0072] Figure 2 Also shown is a printed circuit board 11 arranged below the glass-ceramic window 9, having a through opening in which a central magnet 20 is arranged. Eight magnetic field sensors 13 are arranged substantially in a circle within the annular space 17, the center point of which aligns with the axis of rotation 14 when the knob 3 is positioned on surface 8. This... Figure 6 The figure shows a schematic perspective top view of the printed circuit board 11 of the operating device 2. Seven unlabeled display segments of display field 27 are also arranged on the printed circuit board 11. A magnetic yoke 30, constructed as a metal sheet, is arranged below the printed circuit board 11 and the central magnet 20. The printed circuit board 11, its components, the magnetic yoke 30, and the central magnet 20 are held by a retaining plate 23 arranged below. The entire electronic assembly is pressed against the lower side of the cooktop panel 10 in a manner not further described. Other electronic components, capable of connecting to the magnetic field sensor 13 and at least partially evaluating its sensor signals and / or transmitting them to the control unit 12, can be arranged on the printed circuit board 11.

[0073] Below the glass-ceramic window 9 is a printed circuit board 11 with a magnetic field sensor, a central magnet 20 configured as a cylindrical magnet and axially magnetized, and a ferromagnetic yoke 30 below it. The printed circuit board 11 is currently positioned as close as possible to the glass-ceramic window 9. This unit can be fixedly connected to a main circuit board (not shown further) and the resulting system can then be pressed onto the glass-ceramic window 9, or the unit can be spring-supported separately from the printed circuit board 11. Preferably, these variations have a fixed connection. The sandwich structure formed by the printed circuit board 11, the sensor circuit board, the central magnet 20, and the ferromagnetic yoke 30 is connected, for example, to a plastic portion that is fixedly connected to the main circuit board.

[0074] according to Figure 4 The knob 3 is currently equipped with a second permanent magnet 18 with a three-ring-shaped structure. This results in six successively varying magnetic flux densities in the circumferential direction. Figure 7 and 8 In the permanent magnet assembly 16 of knob 3 and according to Figure 2 A schematic diagram of magnetic flux density is shown in a segment of the annular space 17 between the magnetic field sensors 13. Figure 7 and 8 The same cross-sectional planes along the axis of rotation 14 are shown respectively. Figure 7 and 8 Two magnetic field sensors 13 for alternative operating devices 2 are shown as an example, wherein the magnetic field sensor 13 arranged close to the rotation axis 14 corresponds to the arrangement in the case of the operating device being used as an oven control device, and conversely, the magnetic field sensor 13 arranged further away from the rotation axis 14 corresponds to the arrangement in the case of the operating device being used as a stove control device.

[0075] Figure 7 The diagram shows the state in a first rotational position, where the magnetic field sensor 13 is opposite a region of the permanent magnet assembly 16, in which a first annular permanent magnet 22 and a second permanent magnet 18 with a segmental structure are located. Conversely, Figure 8 The diagram shows the state in the second rotational position, where the magnetic field sensor 13 is opposite a region of the permanent magnet assembly 16, in which only one of the first annular permanent magnets 22 is present and not one of the second permanent magnets 18 with a segmental structure is present. Reference numeral 31 indicates the magnetic field lines, used to illustrate the magnetic field on the illustrated cross-section for both rotational positions.

[0076] from Figure 7 As can be seen, the magnetic flux density detected in the region of magnetic field sensor 13 is particularly small. The magnetic field lines, indicated by reference numeral 31 (whose local spatial density depends on the local magnetic flux density), are spaced far apart from each other. Therefore, the resulting sensor signal has a small signal value.

[0077] and Figure 7 Different, from Figure 8 As can be seen, the magnetic flux density detected in the region of magnetic field sensor 13 is relatively large. This is consistent with... Figure 7 Compared to the previous case, the magnetic field lines are much smaller in spacing. Correspondingly, the resulting sensor signal has a large signal value.

[0078] By designing, particularly the permanent magnets 18 and 22, the change in magnetic flux density can be influenced, thereby enabling a larger signal difference in the sensor signal between two rotational positions. This allows for greater sensitivity when detecting permanent magnetic fields. Furthermore, a higher resolution can be achieved by using a corresponding number of magnetic field sensors 13 and the second permanent magnet 18. This, for example, allows for the detection of the rotational movement of the knob 3 with particularly fine resolution. Similarly, the tilt angle can be detected with particularly fine resolution when the knob 3 is tilted. At the same time, the knob 3 can be manufactured simply, thereby reducing related costs.

[0079] Figure 9 Graphs 32 to 36 illustrate the signal trends of five of the eight magnetic field sensors 13 when the knob 3 is tilted to different tilt positions. The detected magnetic flux density of the corresponding magnetic field sensor 13 is assigned to the vertical axis and time to the horizontal axis. It can be seen that the knob 3 is manually tilted between approximately 23.5 s and approximately 24 s. Here, graphs 32 to 34 show that the sensor signals increase their values ​​because a larger magnetic flux density is detected. Conversely, graph 36 shows that the sensor signals decrease their values ​​because a smaller magnetic flux density is detected. Graph 35 shows that the sensor signals roughly maintain their values ​​because the detected magnetic flux density does not change significantly. This also applies to the time period between 25 s and 26 s and the range of 27 s, where the tilt position changes.

[0080] Figure 10 In such Figure 9 The schematic diagram shows the signal trends of four selected magnetic field sensors out of the eight magnetic field sensors 13 used to detect the rotation of knob 3. The selected sensor signals are indicated by figures 37 to 40. It can be seen that from approximately 3 seconds onwards, all selected sensor signals exhibit a roughly sinusoidal trend based on the rotation of knob 3, where the amplitudes are essentially equal. The selected sensor signals differ primarily in phase, which is mainly determined by the position of the corresponding magnetic field sensor 13. Thus, the phase of the sinusoidal trend changes accordingly with the rotation of knob 3.

[0081] Then, the control unit 12 can determine the type of manual operation and the value of the operation by correspondingly evaluating the sensor signals from the signal flow previously illustrated.

[0082] The tilting motion of knob 3 can be evaluated, for example, by assessing the change in magnetic flux density during tilting. This can be detected using a magnetic field sensor 13 positioned directly below the permanent magnets 18 and 22. To assess rotation of knob 3, different magnetic flux densities can be employed around the periphery of knob 3. By constructing, for example, special magnets with multi-level magnetization, patterns with different magnetic flux densities can be generated, which can be detected during rotation. For knob rotation recognition, the magnetic field sensor 13 can also be positioned further inward radially, without needing to be positioned directly below the center of the permanent magnets 18 and 22.

[0083] The greater flexibility of the knob according to the invention allows it to be used in a wide variety of operating devices or household appliances. The knob 3 can therefore be used not only on a stovetop—as described in the embodiments—but also on an oven, an automatic coffee machine, a washing machine, a dishwasher, a dryer, etc.

[0084] from Figures 7 to 10 As can be seen, the magnetic flux density directions overlap in the current design. Each type of manual operation of knob 3—that is, tilting, rotating, mounting, removing, and / or similar operations—affects the entire direction of the magnetic flux density detected by magnetic field sensor 13. As previously mentioned, these movement types can be separated from each other based on signal processing using appropriate methods. Separability is achieved by using specific properties of partial signals and targeted optimization of those partial signals. In particular, sinusoidal directions of different period lengths have been shown to be computationally separable. However, alternative directions can also be set in principle.

[0085] At least cylindrical magnets 20, 21, and 24, and preferably permanent magnets 18 and 22, can be constructed at least partially from sintered rare-earth magnets (NdFeB). For cost reasons, the rare-earth magnets can be made from plastic-bonded injection-molded rare-earth magnets or plastic-bonded injection-molded hard ferrite. A solution using plastic-bonded injection-molded rare-earth magnets with multipole magnetization is preferred. It is also possible to construct special magnets using single magnets; all common magnet materials are considered here.

[0086] Alternatively, the knob 3 can be implemented as a one-piece variant, in which case the stator unit 25 can be omitted, and all components can be integrated into the rotor unit 26. To prevent the magnets from getting damp, the plastic parts of the rotor unit 26 and the stator unit 25 can be ultrasonically welded. Alternatively, O-rings or other seals can be used for sealing.

[0087] The embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0088] List of reference numerals

[0089] 1 stove

[0090] 2 Operating device

[0091] 3 knobs

[0092] 4 cooking areas

[0093] 5 cooking areas

[0094] 6 cooking areas

[0095] 7 cooking areas

[0096] 8 surfaces

[0097] 9 Glass-ceramic windows

[0098] 10 Stove Panels

[0099] 11 Printed Circuit Boards

[0100] 12 control units

[0101] 13 Magnetic Field Sensors

[0102] 14 Rotation axis

[0103] 15 ring-shaped areas

[0104] 16 permanent magnet assembly

[0105] 17. Circular Space

[0106] 18-ring segment permanent magnet

[0107] 19 Inner side

[0108] 20 central magnets

[0109] 21 central magnets

[0110] 22-ring permanent magnet

[0111] 23 retaining plate

[0112] 24-center magnet

[0113] 25 stator units

[0114] 26 rotor units

[0115] 27 display areas

[0116] 28 center connecting elements

[0117] 29 Magnetic Yoke

[0118] 30 magnetic yoke

[0119] 21 magnetic field lines

[0120] 32 graphics

[0121] 33 graphics

[0122] 34 graphics

[0123] 35 graphics

[0124] 36 graphics

[0125] 37 graphics

[0126] 38 graphics

[0127] 39 graphics

[0128] 40 graphics

[0129] 60-button housing

[0130] 61-button cover

[0131] 63 receiving ring

[0132] 64 Keep your feet

Claims

1. A knob (3) for operating a device (2), the knob having a central connecting element (28) for holding the knob (3) on a surface (8) of the operating device (2), wherein, The connecting element (28) is arranged in the region of the axis of the knob (3), which serves as the axis of rotation (14) when the knob (3) is used as intended. The knob also has a permanent magnet assembly (16) arranged in an annular region (15) surrounding the axis of rotation (14) of the knob (3) and configured to provide a permanent magnetic field at least in an annular space (17) containing the annular region (15), the annular space extending at least to the surface (8) parallel to the axis of rotation (14). The permanent magnet assembly (16) is characterized by having a first permanent magnet (22) of an annular configuration and being configured to provide... A permanent magnetic field having different magnetic flux densities in the circumferential direction about the rotation axis (14) is provided, wherein the first permanent magnet (22) of the annular structure is magnetized in a first magnetization manner parallel to the rotation axis (14), wherein the permanent magnet assembly (16) has at least one second permanent magnet (18) of the annular structure, the second permanent magnet being magnetized in a second magnetization manner parallel to the rotation axis (14), the second magnetization being oriented in the same or opposite manner to the first magnetization, wherein the at least one second permanent magnet (18) is arranged radially adjacent to the first permanent magnet (22) about the rotation axis (14).

2. The knob according to claim 1, characterized in that, The at least one second permanent magnet (18) extends in the circumferential direction about the rotation axis (14) at a preset angle.

3. The knob according to claim 1 or 2, characterized in that, The first permanent magnet (22) and the at least one second permanent magnet (18) have axial extension lengths equal with respect to the rotation axis (14).

4. The knob according to claim 1 or 2, characterized in that, The first permanent magnet (22) and the at least one second permanent magnet (18) have radial extension lengths equal with respect to the axis of rotation (14).

5. The knob according to claim 1 or 2, characterized in that, The first permanent magnet (22) and the at least one second permanent magnet (18) provide the same angle-specific magnetic flux.

6. The knob according to claim 1 or 2, characterized in that, The permanent magnet assembly (16) has at least two second permanent magnets (18), which are arranged radially adjacent to the first permanent magnet (22) about the rotation axis (14), wherein the at least two second permanent magnets (18) are arranged circumferentially spaced apart from each other about the rotation axis (14) at a preset angle.

7. The knob according to claim 6, characterized in that, The at least two second permanent magnets (18) are radially spaced equally from the axis of rotation.

8. The knob according to claim 1 or 2, characterized in that, The central connecting element (28) has at least one central magnet (20, 21, 24).

9. The knob according to claim 1 or 2, characterized in that, The knob has a stator unit (25) and a rotor unit (26), the rotor unit being movably connected to the stator unit (25), wherein the permanent magnet assembly (16) is arranged in the rotor unit (26).

10. The knob according to claim 9, characterized in that, The connecting element (28) at the center is arranged at least partially in the stator unit (25) or the rotor unit (26).

11. The knob according to claim 10, characterized in that, In the case where the second magnetization mode is designed to be opposite to the first magnetization mode, the central connecting element (28) has at least one central magnet (20, 21, 24), the magnetization mode of which corresponds to the second magnetization mode.

12. The knob according to claim 9, characterized in that, The stator unit (25) and the rotor unit (26) are configured to be detachably connected to each other.

13. The knob according to claim 1, characterized in that, The knob (3) is configured as an operating device (2) for household appliances (1).

14. An operating device (2) for a household appliance (1), the operating device having a knob (3), a surface (8) constructed for holding the knob (3) of a member (9), a magnetic field sensor (13), and a control unit (12) connected to the magnetic field sensor (13) via signal technology, the control unit being used to provide at least one control signal (32 to 40) for the household appliance (1), characterized in that, The knob (3) is constructed according to any one of the preceding claims.

15. A household appliance (1) having an operating device (2), characterized in that, The operating device (2) is constructed according to claim 14.

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