Laundry care appliances with electric synchronous motors

Abstract

A laundry care appliance includes an electric synchronous motor for operating electrical components of the appliance. The electric synchronous motor has a stator with at least three stator protrusions, each stator protrusion having a stator coil for generating a rotating magnetic field. The electric synchronous motor also has a rotor with at least three rotor poles, the rotor being rotatable by the generated rotating magnetic field. The laundry care appliance includes a control device connected to the electric synchronous motor in a control technology. The stator has at least one recess arranged on the periphery of the stator between two adjacent stator protrusions, the recess being configured to modify the rotating magnetic field generated by the stator. The rotor has a plurality of magnetic elements arranged on the periphery of the rotor between two adjacent rotor poles, the magnetic elements being configured to modify the rotating magnetic field generated by the stator. The control device is configured to determine the rotational position of the rotor based on the modified rotating magnetic field of the stator.

Description

Technical Field

[0001] This invention relates to a laundry care appliance with an electric synchronous motor. Background Technology

[0002] In traditional laundry appliances, synchronous motors are frequently used to operate the electrical components, such as drum motors for driving the washing machine drum. These synchronous motors have a stator with stator coils configured to generate a rotating magnetic field. This rotating magnetic field causes the rotor of the synchronous motor to rotate, and this rotational motion is transmitted to the electrical components to drive them. However, in conventional synchronous motors, the rotational position of the rotor is typically not determined. Summary of the Invention

[0003] The objective of this invention is to provide a laundry care appliance having an electric synchronous motor for operating the electrical components of the laundry care appliance, wherein the rotational position of the rotor of the electric synchronous motor can be advantageously determined.

[0004] This task is solved by means of the subject matter according to the invention. Advantageous embodiments are the subject matter of the specification and drawings.

[0005] According to a first aspect, the objective of the invention is solved by a laundry care appliance having an electric synchronous motor for operating the electrical components of the laundry care appliance, wherein the electric synchronous motor has a stator with at least three stator protrusions, wherein each stator protrusion has a stator coil for generating a rotating magnetic field, wherein the electric synchronous motor has a rotor with at least three rotor poles, wherein the rotor is rotatable by the generated rotating magnetic field, and the laundry care appliance has a control device connected to the electric synchronous motor in a controllable manner, wherein the stator has at least one recess arranged on the periphery of the stator between two adjacent stator protrusions, wherein the recess is configured to modify the rotating magnetic field generated by the stator, and / or wherein the rotor has a plurality of magnetic elements arranged on the periphery of the rotor between two adjacent rotor poles, wherein the magnetic elements are configured to modify the rotating magnetic field generated by the stator, and wherein the control device is configured to determine the rotational position of the rotor based on the modified rotating magnetic field of the stator.

[0006] The resulting technical advantage is that the rotating magnetic field generated by the stator can be advantageously modified by arranging recesses on the periphery of the stator and / or by arranging magnetic elements on the periphery of the rotor, wherein the control device can determine the rotational position of the rotor based on the modified rotating magnetic field.

[0007] In particular, the at least one recess includes a plurality of recesses, wherein one of the plurality of recesses is arranged between two adjacent stator protrusions.

[0008] Determining the rotational position allows the control device to determine multiple parameters of the electro-synchronous motor, such as the rotor angle, rotor speed, and rotor rest position. Therefore, for example, speed regulation can be performed across the entire speed range of the electro-synchronous motor, and the motor does not need to be controlled to start from a standstill as is typically the case in conventional electro-synchronous motors.

[0009] By omitting the corresponding controlled operation during motor startup, the energy demand and motor temperature of the electric synchronous motor according to this disclosure can be advantageously reduced.

[0010] Furthermore, even under sudden load changes, it is possible to ensure favorable speed regulation within a very small speed range, such as less than 20 revolutions per minute, thereby ensuring a particularly gentle laundry care method when, for example, a corresponding electric synchronous motor is used in the drum drive to drive the laundry drum of the laundry care appliance in the case of sensitive laundry, such as wool.

[0011] Furthermore, the advantageous rotational position determination of the electric synchronous motor disclosed herein (e.g., when used in a drum drive) enables precise orientation of the rotational position or rotational direction of the laundry drum (especially within a very small speed range), thereby ensuring particularly effective wetting or care of the laundry in the laundry drum.

[0012] This disclosure is based on the understanding that the rotating magnetic field generated by the stator of an electro-synchronous motor can be specifically modified. This can be achieved either by introducing recesses on the periphery of the stator or by introducing magnetic elements on the periphery of the rotor, or it can also be achieved by a combination of recesses on the stator side and magnetic elements on the rotor side.

[0013] The corresponding structural changes of the electric synchronous motor cause corresponding changes in the magnetic flux inside the corresponding stator pole, and the magnetic flux in turn affects the motor current applied to the electric synchronous motor.

[0014] Therefore, the motor current applied to the synchronous motor and evaluated by the control device includes two components: the fundamental motor current, especially the fundamental frequency (Grundschwingung) of the detected power value, as the first component, and the modified motor current, especially the harmonic frequency (Oberschwingung) of the detected power value, as the second component.

[0015] Based on the evaluation of the modified motor current, especially the harmonics of the detected electrical power value, by the control device, the control device can determine the rotational orientation of the rotor of the electro-synchronous motor.

[0016] The control device can perform the evaluation, for example, by comparing the determined motor current with the stored reference data of the corresponding modified motor current.

[0017] In this way, the rotational position or orientation of the rotor of the electro-synchronous motor can be determined quickly and efficiently by the control device, thereby enabling advantageous control of multiple parameters of the electro-synchronous motor.

[0018] Laundry care appliances are understood to be appliances used for laundry care, such as washing machines or dryers. In particular, they are understood to be household laundry care appliances. That is, laundry care appliances used within the scope of household chores and used to handle the usual amount of laundry for the household.

[0019] In an advantageous embodiment, the control device is configured to detect electrical power values, particularly the motor current applied to the stator, in order to determine the modified rotating magnetic field of the stator.

[0020] The resulting technical advantage is that the electrical power value, especially the motor current applied to the stator, can be easily and advantageously detected by a control device. Based on the fundamental principles of electromagnetism, there is a correlation between the current flowing through the stator coils and the resulting magnetic field, which in turn is related to the rotational position of the rotor. Therefore, the rotating magnetic field of the stator can be advantageously determined based on an assessment of the electrical power value, especially the motor current applied to the stator.

[0021] In an advantageous embodiment, the detected electrical power value, in particular the stator motor current, has an oscillation / wave (Schwingung) comprising a fundamental wave, in particular a sine wave and harmonics, wherein the harmonics are based on a modified rotating magnetic field of the stator, and wherein the control device is configured to determine the modified rotating magnetic field of the stator based on the harmonics.

[0022] The resulting technical advantage is that the rotor's rotational position can be determined particularly effectively through a detailed evaluation of the electrical power value, especially the stator motor current, by the control device. The mechanical modification of the stator via recesses and / or the mechanical modification of the rotor via magnetic elements causes a change in the limitation of magnetic flux in the stator poles, which is reflected in the electrical power value, especially the stator motor current.

[0023] Here, the control device can evaluate the waveform of the electrical power value in detail and, in addition to the fundamental frequency, also evaluate harmonics based on mechanical modifications to the stator and / or rotor. In particular, the superimposed frequency components of the electrical power values ​​are modulated into the fundamental frequency, which are caused by the mechanical modifications to the stator and / or rotor.

[0024] In an advantageous embodiment, the electric synchronous motor is configured as a permanent magnet excited synchronous motor (PMSM), which in particular has a stator and / or rotor made of permanent magnet material, especially iron.

[0025] The resulting technical advantage is that the permanent magnet excited synchronous motor (PMSM) can operate at variable speeds, thus allowing, for example, the drum drive of a laundry care appliance or the lye pump to operate at different speeds.

[0026] In one advantageous embodiment, the electrical components of the laundry care appliance include a drum drive for rotating the laundry drum of the laundry care appliance and / or a laundry liquid pump for pumping laundry liquid from a lye container of the laundry care appliance, wherein the electro-synchronous motor is configured to operate the drum drive to rotate the laundry drum and / or to operate the pump to pump the laundry liquid.

[0027] The resulting technical advantage is that determining the rotor's rotational position is advantageous (especially when an electric synchronous motor is used in the drum drive or detergent pump), because in addition to the reduced energy and temperature of the synchronous motor, operation can be achieved within a very small speed range, and, for example, precise orientation of the laundry drum can be achieved (e.g., during the wetting phase of the laundry care process).

[0028] In one advantageous embodiment, the electro-synchronous motor is configured to operate the drum drive to rotate the laundry drum, wherein the control device is configured to change the rotational speed, rotation direction, and / or reversal frequency of the laundry drum based on the determined rotor position of the rotor during the laundry care process of the laundry care appliance, especially the spin-drying / twisting process, in order to optimize the laundry care process.

[0029] The resulting technical advantage is that it ensures particularly advantageous optimization of the laundry care process, especially the tumbling process.

[0030] In an advantageous embodiment, the control device is configured to determine the rotor speed based on the modified rotating magnetic field of the stator.

[0031] The resulting technical advantage is that, for example, the rotor speed can be determined particularly advantageously by evaluating multiple motor currents over a defined time interval, thereby allowing for particularly advantageous control and optimization of speed variations.

[0032] In an advantageous embodiment, the recess is centrally or offset between two adjacent stator protrusions.

[0033] The resulting technical advantage is that by arranging recesses centrally or offset between two adjacent stator protrusions, the modified rotating magnetic field of the stator can be limited and modified.

[0034] In particular, the recess includes multiple recesses, wherein one of the multiple recesses is arranged centrally or offset between two adjacent stator protrusions.

[0035] The recesses particularly include a plurality of recesses arranged centrally or offset between two adjacent stator protrusions, wherein, particularly, there are no recesses between at least one pair of adjacent stator protrusions.

[0036] In an advantageous embodiment, a unique recess and / or multiple recesses are arranged between two adjacent stator protrusions.

[0037] The resulting technical advantage is that by arranging one or more recesses between two adjacent stator protrusions, the modified rotating magnetic field of the stator can be limited and modified.

[0038] In particular, the recesses are arranged irregularly, especially about the center of the stator.

[0039] In one advantageous embodiment, the plurality of magnetic elements have a plurality of main magnetic poles, the plurality of main magnetic poles having alternating magnetic polarities.

[0040] The resulting technical advantage is that the rotating magnetic field of the stator can be effectively modified by using main magnetic poles with alternating magnetic polarities.

[0041] In an advantageous embodiment, the magnetic element has a plurality of coded magnetic poles having alternating magnetic polarities, wherein the coded magnetic poles are particularly arranged on the main magnetic poles.

[0042] The resulting technical advantage is that the alternating rotating magnetic field of the stator can be effectively modified by using coded magnetic poles with alternating magnetic polarities.

[0043] In particular, a plurality of coded magnetic poles with alternating magnetic polarities are arranged on each of the plurality of main magnetic poles. In particular, an odd number, especially three, of coded magnetic poles with alternating magnetic polarities are arranged on each of the plurality of main magnetic poles.

[0044] In particular, the coded magnetic poles arranged on a single main magnetic pole among multiple main magnetic poles have the same magnetic polarity as that main magnetic pole.

[0045] In an advantageous embodiment, the magnetic elements are arranged symmetrically around the rotor.

[0046] The technical advantage achieved in this way is that it allows for the limited modification of the rotating magnetic field of the stator.

[0047] In an advantageous embodiment, the electric synchronous motor has a magnetic field sensor, particularly a Hall sensor, configured to determine a modified rotating magnetic field of the stator, wherein the control device is configured to determine the rotational position of the rotor based on the modified rotating magnetic field of the stator.

[0048] The resulting technical advantage is that the accuracy of determining the modified rotating magnetic field of the stator can be improved through magnetic field sensors, especially Hall sensors.

[0049] In an advantageous embodiment, the magnetic field sensor has a flux conductor, which is particularly arranged on the circuit board of the electric synchronous motor, wherein the flux conductor is configured to detect a modified rotating magnetic field of the stator.

[0050] The resulting technical advantage is that it enables the particularly advantageous detection of the rotating magnetic field of the stator.

[0051] According to a second aspect, the objective of the invention is achieved by a method for determining the rotational position of the rotor of an electric synchronous motor in a laundry care appliance, wherein the laundry care appliance has an electric synchronous motor for operating electrical components of the laundry care appliance, wherein the electric synchronous motor has a stator having at least three stator protrusions, wherein each stator protrusion has a stator coil for generating a rotating magnetic field, wherein the electric synchronous motor has a rotor having at least three rotor poles, wherein the rotor is rotatable by the generated rotating magnetic field, and wherein the laundry care appliance has a control device. The control device is connected to the electric synchronous motor in a control technology, wherein the stator has at least one recess arranged on the periphery of the stator between two adjacent stator protrusions, wherein the recess is configured to modify the rotating magnetic field generated by the stator, and / or wherein the rotor has a plurality of magnetic elements arranged on the periphery of the rotor between two adjacent rotor poles, wherein the magnetic elements are configured to modify the rotating magnetic field generated by the stator, wherein the method includes the following method steps: determining the rotational position of the rotor by the control device based on the modified rotating magnetic field of the stator.

[0052] The resulting technical advantage is that it ensures the advantageous determination of the rotor's rotational position. Attached Figure Description

[0053] Other embodiments are illustrated with reference to the accompanying drawings. The drawings show:

[0054] Figure 1 A schematic diagram of a laundry care appliance with an electric synchronous motor according to one embodiment of this application;

[0055] Figure 2 A perspective view of an electric synchronous motor for a laundry care appliance according to one embodiment of this application;

[0056] Figure 3 A perspective view of the stator of an electric synchronous motor according to one embodiment of this application;

[0057] Figure 4 A perspective view of another stator of an electric synchronous motor according to another embodiment of this application;

[0058] Figure 5 A perspective view of another stator of an electric synchronous motor according to another embodiment of this application;

[0059] Figure 6 A perspective view of the rotor of an electric synchronous motor according to another embodiment of this application;

[0060] Figure 7 According to this application, Figure 6 A perspective view of the magnetic elements of the rotor of an electric synchronous motor according to an embodiment shown in the figure;

[0061] Figure 8 A perspective view of an electrically synchronous motor with a magnetic field sensor according to another embodiment of this application; and

[0062] Figure 9 A schematic diagram of a method for determining the rotational position of the rotor of an electric synchronous motor in a laundry care appliance, according to one embodiment of this application. Detailed Implementation

[0063] Figure 1 A schematic diagram of a laundry care appliance with an electric synchronous motor according to one embodiment of this application is shown.

[0064] A laundry drum 103 for receiving laundry is arranged inside the appliance housing 101 of the laundry care appliance 100, wherein the laundry drum 103 is connected to the drum driver 107 of the laundry care appliance 100 via a drive shaft 105. The drum driver 107 is configured to rotate the drum 103 and has an electric synchronous motor 109 for operating the drum driver 107.

[0065] The control device 111 of the laundry care appliance 100 is connected to the electric synchronous motor 109 in terms of control technology.

[0066] Alternative or additional land, in Figure 1 The part not shown is used for the washing and care appliance 100 in Figure 1 The washing liquid pump, which pumps washing liquid from an alkaline container (not shown), may have an electric synchronous motor 109 configured to operate the washing liquid pump to pump washing liquid.

[0067] Therefore, the electric synchronous motor 109 according to this disclosure is configured as an electrical component for operating the laundry care appliance 100, wherein the electrical component includes, in particular, a drum drive 107 and / or a detergent pump of the laundry care appliance 100.

[0068] Figure 2 A perspective view of an electric synchronous motor of a laundry care appliance according to one embodiment of this application is shown.

[0069] The electro-synchronous motor 109, shown in cross-sectional view, has a stationary stator 115 and a rotatable rotor 117 within a motor housing 113, as well as a motor shaft 119 connected to the rotor 117. The stator 115 generates a rotating magnetic field that drives the rotor 117 to rotate.

[0070] The electric synchronous motor 109 is particularly configured as a permanent magnet excited synchronous motor 109 (PMSM) whose speed can be variably adjusted. In particular, the object of this disclosure is to determine the position of the rotor 117 in a stationary state based on the magnetic reluctance of the permanent magnet excited synchronous motor 109.

[0071] For other structural and functional details, please refer to the implementation plan below.

[0072] Figure 3 A perspective view of the stator of an electric synchronous motor according to one embodiment of this application is shown.

[0073] exist Figure 3 The stator 115 shown has a plurality of stator protrusions 121, particularly twelve stator protrusions 121, wherein each stator protrusion 121 has a stator coil 123 for generating a rotating magnetic field.

[0074] Furthermore, the stator 115 has at least one recess 125, which is arranged on the periphery of the stator 115 between two adjacent stator protrusions 121. In particular, the stator 115 has twelve recesses 125, wherein one of the twelve recesses 125 is arranged between each of two adjacent stator protrusions 121. Although in Figure 3 It is not shown, but alternatively, the recess 125 may not be arranged between two adjacent stator protrusions 121.

[0075] The recess 125 is specifically constructed as a longitudinal slit.

[0076] Even according to Figure 3The recess 125 has a rectangular cross-section, and the recess 125 may alternatively have a triangular, circular, especially semi-circular or polygonal, especially quadrilateral cross-section.

[0077] Since the recess 125 is introduced between the stator protrusions 121 on the periphery of the stator 115, it changes the change in magnetic flux inside the stator pole, which in turn causes a modification in the motor current applied to the stator 115.

[0078] The motor current applied to the stator 115 has a wave, which includes a fundamental wave, especially a sine wave and harmonics, wherein the harmonics are based on the rotating magnetic field of the stator 115 modified by the recess 125.

[0079] exist Figure 1 The control device 111 (not shown) can determine the rotor orientation of the rotor 117 of the electro-synchronous motor 109 based on the harmonics of the motor current of the stator 115, the harmonics being based on the rotating magnetic field of the stator 115 modified by the recess 125. Based on the determined rotor orientation of the rotor 117, the control device 111 can determine the rotational speed of the electro-synchronous motor 109.

[0080] Figure 4 A perspective view of another stator of an electric synchronous motor according to another embodiment of this application is shown.

[0081] Figure 4 A schematic diagram of different stator poles 127 of stator 115 is shown, wherein a plurality of recesses 125, particularly longitudinal slits, are arranged on each stator pole 127, thereby forming a plurality of ridges 129, particularly longitudinal teeth, on the corresponding stator pole 127.

[0082] In particular, five recesses 125, especially longitudinal slits 125, and six ridges 129, especially longitudinal teeth, are arranged on each stator pole 127.

[0083] Figure 5 A perspective view of another stator of an electric synchronous motor according to another embodiment of this application is shown.

[0084] exist Figure 5 The other stator 115 shown in the figure, in addition to having one and then two or more recesses 125 alternately arranged on the periphery of the stator 115, corresponds to the... Figure 3 Stator 115 is shown in the figure.

[0085] Figure 6 A perspective view of the rotor of an electric synchronous motor according to another embodiment of this application is shown.

[0086] Figure 6The rotor 117 shown has a plurality of magnetic elements 131 on its circumference, which are arranged particularly symmetrically on the rotor 117.

[0087] The magnetic flux in the synchronous motor 109 is also modified here via the magnetic element 131 of the rotor 117, wherein, in particular, the stator 115 remains unchanged, i.e., it does not have the recess 125. Specifically, as in Figure 7 As shown in detail, the magnetic field can be modified accordingly by means of the coded magnetic poles 133 arranged on the magnetic element 131.

[0088] Similar to the magnetic field modification already implemented with respect to stator 115, the rotor position of rotor 117 can also be determined by control device 111 based on the magnetic field modification implemented by rotor 117.

[0089] Figure 7 Showing the application according to this application Figure 6 The figure shows a perspective view of the magnetic elements of the rotor of an electric synchronous motor according to an embodiment.

[0090] The magnetic element 131 has a plurality of coded magnetic poles 133 having alternating magnetic polarities, wherein the coded magnetic poles 133 are particularly arranged on the main magnetic poles 135 of the magnetic element 131.

[0091] In particular, the multiple coded magnetic poles 133 have the same magnetic polarity as the corresponding main magnetic poles 135.

[0092] Figure 8 A perspective view of an electric synchronous motor with a magnetic field sensor according to another embodiment of this application is shown.

[0093] As by Figure 8 It is understood that the electric synchronous motor 109 has a magnetic field sensor 137, which is specifically arranged in the receiving section 139 of the circuit board of the electric synchronous motor 109. The magnetic field sensor 137 has a magnetic flux conductor 141 that is in magnetic interaction with the lateral magnet of the rotor 117 in order to detect the modified rotating magnetic field of the stator 115, thereby detecting the rotational position of the rotor 117.

[0094] In addition, the electric synchronous motor 109 also has a motor plug 143.

[0095] Figure 9 A schematic diagram illustrating a method for determining the rotational position of the rotor of an electric synchronous motor in a laundry care appliance, according to one embodiment of this application.

[0096] Method 200 includes the following steps: determining the rotational position of rotor 117 201 based on the modified rotating magnetic field of stator 115 by control device 111.

[0097] All the features described and illustrated in connection with the various embodiments of the present invention can be arranged in different combinations within the subject matter of the invention in order to achieve their advantageous effects simultaneously.

[0098] The scope of protection of this invention is given by the claims and is not limited to the features set forth in the specification or shown in the drawings.

[0099] List of reference numerals

[0100] 100 laundry care appliances

[0101] 101 Appliance housing

[0102] 103 Laundry drum

[0103] 105 drive shaft

[0104] 107 Roller Drive

[0105] 109 Electric Synchronous Motor

[0106] 111 Control device

[0107] 113 Motor housing

[0108] 115 stator

[0109] 117 Rotor

[0110] 119 Motor Shaft

[0111] 121 Stator protrusion

[0112] 123 Stator Coil

[0113] 125 recess

[0114] 127 Stator Pole

[0115] 129 bulge

[0116] 131 Magnetic Components

[0117] 133 Coded Magnetic Pole

[0118] 135 Main magnetic poles

[0119] 137 Magnetic Field Sensor

[0120] 139 Circuit Board

[0121] 141 Magnetic flux conductor

[0122] 143 Motor plug

Claims

1. A laundry care appliance (100) having an electric synchronous motor (109) for operating electrical components of the laundry care appliance (100), wherein, The electric synchronous motor (109) has a stator (115) with at least three stator protrusions (121) projecting from its periphery, each stator protrusion (121) having a stator coil (123) for generating a rotating magnetic field. The electric synchronous motor (109) also has a rotor (117) with at least three rotor poles, the rotor (117) being rotatable by the generated rotating magnetic field. The laundry appliance has a control device (111) connected to the electric synchronous motor (109) in a control technology. The stator (115) has at least one recess (125) arranged on the periphery of the stator (115) between two adjacent stator protrusions (121), wherein the recess (125) is configured to modify the rotating magnetic field generated by the stator (115), and / or The rotor (117) has a plurality of magnetic elements (131) arranged around the periphery of the rotor (117) between two adjacent rotor poles. Each magnetic element (131) is configured to modify the rotating magnetic field generated by the stator (115). Each magnetic element (131) has a plurality of main magnetic poles (135) with alternating magnetic polarities. On each of the main magnetic poles are arranged a plurality of coded magnetic poles (133) with alternating magnetic polarities, the coded magnetic poles (133) having the same magnetic polarity as the corresponding main magnetic pole (135). The control device (111) is configured to determine the rotational position of the rotor (117) based on the modified rotating magnetic field of the stator (115).

2. The laundry care appliance (100) according to claim 1, wherein, The control device (111) is configured to detect the electrical power value in order to determine the modified rotating magnetic field of the stator (115).

3. The laundry care appliance (100) according to claim 1, wherein, The control device (111) is configured to detect the motor current applied to the stator (115) in order to determine the modified rotating magnetic field of the stator (115).

4. The laundry care appliance (100) according to claim 2, wherein, The detected electrical power value has a wave, which includes a fundamental wave and harmonics, wherein the harmonics are based on a modified rotating magnetic field of the stator (115), and wherein the control device (111) is configured to determine the modified rotating magnetic field of the stator (115) based on the harmonics.

5. The laundry care appliance (100) according to claim 3, wherein, The motor current of the stator (115) has a wave, the wave including a fundamental wave and harmonics, wherein the harmonics are based on a modified rotating magnetic field of the stator (115), and wherein the control device (111) is configured to determine the modified rotating magnetic field of the stator (115) based on the harmonics.

6. The laundry care appliance (100) according to claim 4 or 5, wherein, The fundamental wave is a sine wave.

7. The laundry care appliance (100) according to any one of claims 1-5, wherein, The electric synchronous motor (109) is constructed as a permanent magnet excited synchronous motor (PMSM) (109).

8. The laundry care appliance (100) according to claim 7, wherein, The permanent magnet excited synchronous motor has a stator (115) and / or a rotor (117) made of permanent magnet material.

9. The laundry care appliance (100) according to claim 7, wherein, The permanent magnet excited synchronous motor has a stator (115) and / or a rotor (117) made of iron.

10. The laundry care appliance (100) according to any one of claims 1-5, 8, and 9, wherein, The electrical components of the laundry care appliance (100) include a drum drive (107) for rotating the laundry drum (103) of the laundry care appliance (100) and / or a detergent pump for pumping detergent from a lye container of the laundry care appliance (100), wherein the electro-synchronous motor (109) is configured to operate the drum drive (107) to rotate the laundry drum (103) and / or to operate the pump to pump detergent.

11. The laundry care appliance (100) according to claim 10, wherein, The electric synchronous motor (109) is configured to operate the drum drive (107) to rotate the laundry drum (103), wherein the control device (111) is configured to, during the laundry care process of the laundry care appliance (100), change the rotational speed, rotational direction and / or reversal frequency of the laundry drum (103) based on the determined rotor position of the rotor (117) in order to optimize the laundry care process.

12. The laundry care appliance (100) according to claim 11, wherein, The control device (111) is configured to change the rotational speed, rotational direction and / or reversal frequency of the laundry drum (103) based on the determined rotor position of the rotor (117) during the tumbling process of the laundry care appliance (100) in order to optimize the laundry care process.

13. The laundry care appliance (100) according to any one of claims 1-5, 8, 9, 11, and 12, wherein, The control device (111) is configured to determine the rotational speed of the rotor (117) based on the modified rotating magnetic field of the stator (115).

14. The laundry care appliance (100) according to any one of claims 1-5, 8, 9, 11, and 12, wherein, The recess (125) is centrally or offset between two adjacent stator protrusions (121).

15. The laundry care appliance (100) according to any one of claims 1-5, 8, 9, 11, and 12, wherein, A unique recess (125) and / or multiple recesses (125) are arranged between two adjacent stator protrusions (121).

16. The laundry care appliance (100) according to any one of claims 1-5, 8, 9, 11, and 12, wherein, The magnetic element (131) is arranged symmetrically around the rotor (117).

17. The laundry care appliance (100) according to any one of claims 1-5, 8, 9, 11, and 12, wherein, The electric synchronous motor (109) has a magnetic field sensor (137) configured to determine a modified rotating magnetic field of the stator (115), wherein the control device (111) is configured to determine the rotational position of the rotor (117) based on the modified rotating magnetic field of the stator (115).

18. The laundry care appliance (100) according to claim 17, wherein, The magnetic field sensor (137) has a magnetic flux conductor (141) configured to detect a modified rotating magnetic field of the stator (115); and / or The magnetic field sensor (137) is a Hall sensor.

19. The laundry care appliance (100) according to claim 18, wherein, The magnetic flux conductor is arranged on the circuit board (139) of the electric synchronous motor (109).

20. A method (200) for determining the rotational position of the rotor (117) of an electric synchronous motor (109) in a laundry care appliance (100), wherein, The laundry care appliance (100) has an electric synchronous motor (109) for operating the electrical components of the laundry care appliance (100), wherein the electric synchronous motor (109) has a stator (115) with at least three stator protrusions (121) projecting from its periphery, wherein each stator protrusion (121) has a stator coil (123) for generating a rotating magnetic field, wherein the electric synchronous motor (109) has a rotor (117) with at least three rotor poles, wherein the rotor (117) is rotatable by the generated rotating magnetic field, wherein the laundry care appliance (100) has a control device (111) connected to the electric synchronous motor (109) in a control technology, wherein the stator (115) has at least one recess (125), wherein... A recess (125) is arranged on the periphery of the stator (115) between two adjacent stator protrusions (121), wherein the recess (125) is configured to modify the rotating magnetic field generated by the stator (115), and / or wherein the rotor (117) has a plurality of magnetic elements (131), the magnetic elements being arranged on the periphery of the rotor (117) between two adjacent rotor poles, wherein the magnetic elements (131) are configured to modify the rotating magnetic field generated by the stator (115), the plurality of magnetic elements (131) having a plurality of main magnetic poles (135) having alternating magnetic polarities, and a plurality of coded magnetic poles (133) having alternating magnetic polarities are arranged on each of the plurality of main magnetic poles, the plurality of coded magnetic poles (133) having the same magnetic polarity as the corresponding main magnetic pole (135). The method (200) is characterized by comprising the following steps: The control device (111) determines (201) the rotational position of the rotor (117) based on the modified rotating magnetic field of the stator (115).

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