DE102016100062A1 - Electrical device for unambiguous determination of a rotor position - Google Patents

Abstract

Electric device (10) comprising a stator (20) and a rotor (30) movable relative to the stator (20), at least one inductive electrical component (21), at least one evaluation device (70) for determining an evaluation result by an evaluation of the electrical Component (21), wherein a position of the rotor (30) relative to the stator (20) on the basis of the evaluation result can be determined. In this case, it is provided that at least one marking (40) is provided for determining the position of the rotor (30), wherein the marking (40) can be detected by a detection unit (60) as a function of the rotor position for determining a marking information, with a combination of the evaluation result with the marking information, the position of the rotor (30) is uniquely determined.

Description

The present invention relates to an electrical device according to the type defined in greater detail in the preamble of claim 1. Furthermore, the invention relates to a method according to the preamble of claim 8.

In electrical devices, such as rotating electrical machines, movement of a rotor relative to a stator is effected by electrically driving inductive electrical components such as stator windings. It is known from the prior art that the position of the rotor can be determined by an electrical evaluation of these components.

A disadvantage of the known solutions is that the position of the rotor can often be detected only ambiguously or ambiguously by the evaluation of the components. For example, the location can only be determined to 180 °, so z. B. a 0 ° position of the rotor can not be distinguished from a 180 ° position of the rotor. For improved unambiguous determination of the position, for example, rotor position sensors can be used, which, however, are complex and costly to manufacture and therefore also expensive.

From the EP 0 332 244 A1 An encoder is disclosed which encodes the position of a rotating disk as a multi-bit binary code. Thus, a positional encryption is possible, which, however, has an increased complexity.

It is therefore an object of the present invention to at least partially overcome the disadvantages described above. In particular, it is an object of the present invention to perform a clear determination of the rotor position reliably and inexpensively.

The above object is achieved by an electrical device having the features of claim 1 and by a method having the features of claim 8. Further features and details of the invention will become apparent from the respective dependent claims, the description and the drawings. In this case, features and details that are described in connection with the electrical device according to the invention apply, of course, also in connection with the inventive method, and in each case vice versa, so with respect to the disclosure of the individual aspects of the invention is always reciprocal reference or can be.

The object is achieved in particular by an electrical device which comprises a stator and a rotor which is movable relative to the stator and in particular rotatable. Further, at least one inductive electrical component, preferably arranged on the stator. In addition, the electrical device comprises at least one evaluation device for determining an evaluation result by an evaluation of the electrical component, in particular such that a position of the rotor relative to the stator based on the evaluation result, in particular ambiguous, determinable (detectable). It is further conceivable that at least one marking, in particular on the rotor and / or on the stator, for preferably unambiguous determination (detection) of the position of the rotor, preferably fixed and / or rotationally fixed on the rotor or stator, is provided and / or fixed. It can be provided that the marking is detectable by a detection unit rotorlageabhängig for determining a marker information and / or detected, based on a combination of the evaluation result with the marker information, the position of the rotor, in particular at an electrical angle, is uniquely determined. In other words, the evaluation result is combined with the marker information, for example digitally by a processing device, to uniquely determine the position of the rotor. The processing device is, for example, electrically connected to the detection unit and / or to the evaluation device and / or component of the evaluation device or the detection unit. The detection of the marking is preferably carried out depending on the rotor position, that is, in particular in dependence on a (rotational) position of the rotor relative to the stator, so that, for example, at a 0 ° position of the rotor, a different detection than at a 180 ° position of the rotor. In particular, the evaluation of the position of the rotor by the evaluation device can be considered as a periodic function, which provides the same evaluation results for different positions (positions). The marking preferably characterizes at least one or each cycle of the evaluation in relation to this periodicity, and the detection of the cycles preferably delimits or distinguishes the cycles of the evaluation from one another. This has the advantage that the position of the rotor can be determined unambiguously, that is to say in particular precisely at 360 ° and / or for all (rotational) positions of the rotor. For a reliable determination of the position, that is, in particular the rotational position and / or (rotational) position and / or angular position, the rotor relative to the stator reliably and easily possible.

The electrical device is designed, for example, as an electric machine, preferably as an electric motor, preferably for a vehicle. The vehicle is for example an electric vehicle and / or a hybrid vehicle and / or a motor vehicle and / or a passenger car. The electrical device is preferably designed rotor position encoder free, so that by dispensing with a rotor position sensor, a cost-effective and simple production of the electrical device is possible. The electrical device is designed, for example, as a synchronous machine or as an asynchronous machine. In this case, the rotor is preferably rotatably arranged in the stator, in particular mounted, that the rotor may have a plurality of positions (for example, rotational positions or rotational positions). In particular, these positions can be determined by the evaluation only ambiguous, that is, at least ambiguous. Only by a combination of the evaluation result of the evaluation of the evaluation device with the marking information, the ambiguity can be resolved. The combination takes place, for example, by electrical and / or digital processing, preferably (at least in part) analogously and / or numerically, wherein the values of the evaluation result are related to the marking information and / or compared. Thus, a reliable determination of the rotor position is possible.

In addition, it is advantageous if the marking is arranged in such a way, in particular firmly on the rotor, that a first position of the rotor can be distinguished from a second position of the rotor on the basis of the marking information, wherein a first evaluation result for the first position is identical to one second evaluation result for the second position of the rotor. The first and second position of the rotor are preferably different rotational positions of the rotor relative to the stator (for example, the first position is the 0 ° position and the second position, the 180 ° position). Preferably, the first evaluation result is determined by a first evaluation of the inductive electrical component, wherein the first evaluation is performed in the first position. Particularly preferably, the second evaluation result is determined by a second evaluation of the inductive electrical component, wherein the second evaluation is performed in the second position. The marking is, for example, rotatably mounted on the rotor to reliably index the rotational position of the rotor. In particular, due to the ambiguity, the first evaluation result is identical to the second evaluation result. Preferably, this ambiguity is resolved by the combination of the evaluation result with the marking information, so that the first position can be distinguished from the second position based on the marking information.

It is also conceivable within the scope of the invention that at least one first mark and a second mark adjacent thereto, in particular on the rotor, are provided, each marking a different, in particular complete, unambiguous position range of the rotor. It is provided, for example, that different evaluation results are always determined for the individual, unambiguous position range for different positions of the rotor, and in particular the same evaluation results are determined for different unambiguous position ranges for different positions of the rotor. In other words, the unambiguous determination of the position of the rotor is possible only on the basis of the evaluation result only for the positions which are assigned to a single, unambiguous positional range. This allows, in particular, a simple evaluation by a rotor position sensorless method. In this case, the complete positional area preferably comprises the (contiguous) positional area of the rotor in which the position of the rotor relative to the stator can be determined unambiguously by the evaluation of the component (by the evaluation device) on the basis of the evaluation result. In the unique position range, the values of the evaluation result are preferably continuous and / or proportional to the position of the rotor. The complete unambiguous position ranges are thus preferably the position ranges or positions of the rotor relative to the stator, which can be unambiguously determined in each case as a cycle of evaluation of the position by the evaluation device. An additional position range would result in particular in an ambiguous (ambiguous) evaluation (based on the evaluation result), because at the transitions of the adjoining unambiguous position ranges, the values of the evaluation result for these positions jump at the transition (for example from 180 ° to 0 °). The marking of the complete position ranges therefore has the advantage that a reliable and unambiguous evaluation of the position is possible.

It may also be possible that the stator has the inductive electrical component in the form of a stator winding and / or the electrical component, in particular the stator winding, for generating a magnetic field and / or for effecting movement of the rotor is electrically controllable. In particular, the (inductive electrical) component is electrically connected to the evaluation device in such a way that the component can be evaluated electrically by the evaluation device for the ambiguous, in particular ambiguous, determination of the position of the rotor. It is self-evident that the electrical component in the form of a winding can also be arranged on the rotor in order to allow movement of the rotor. The winding (for example, the stator winding and / or a rotor winding) is fixedly arranged on the stator or rotor or associated with it. The winding can be evaluated by the evaluation device in particular in such a way (ambiguous) that an electrical parameter, preferably an inductance, of the winding can be evaluated and can be provided as an evaluation result. The electrical component and / or the winding is preferably not a dedicated position sensor or a rotor position sensor. Insbeosndere instead serves the electrical component or the winding (mainly) for movement of the rotor, so that the electrical component is a functionally essential component. It is thus used to ensure the functionality already existing component for evaluation and detection of the position of the rotor, so that a significant cost savings and simplification of the structure of the electrical device can be achieved.

In addition, it is advantageous if within the scope of the invention one or more, in particular at least two or three or four, markings are provided, and the rotor and / or stator more, preferably at least two or three or four, in particular magnetic, elements, preferably Permanent magnets, wherein the number of markings on the number of these elements is dependent. Alternatively or additionally, it is conceivable that at least one or more marking pairs, each of which in particular comprises two (complementary and / or different) markings, are provided. The number of markings is preferably dependent on the number of so-called pole pairs of the electrical device. The pole pair number preferably describes the number of pairs of magnetic poles of the electrical device. In this case, for example, the (magnetic) elements in each case form the poles or pole pairs and / or the number of poles and / or the pole pairs depends on the elements. In particular, the electrical angle (a) and the mechanical angle (b) are related via the number of pole pairs (P). The electrical angle (a) is preferably proportional to the mechanical angle (b) and / or the electrical angle (a) corresponds to the mechanical angle (b) multiplied by the number of pole pairs (P): a = P · b

At least or exactly one marking pair is preferably provided over the entire circumference of the electrical angle (that is to say, for example, via the electrical 360 °). Accordingly, it is conceivable that with a pole pair number of P at least or exactly P (ie at least or exactly one of the number of pole pairs corresponding number) marker pairs are necessary. A marking pair comprises in particular a first marking and a second marking, which differ from one another and / or can be differentiated / assigned by the registration unit as different markings of a marking pair. For example, the first mark forms a bright (top) surface and the second mark forms a dark (top) face. In other words, the markings of a pair of markers are complementary to each other. Thus, a clear determination of the situation can be done in a simple manner.

The (magnetic) element is preferably as a permanent magnet, and / or as a magnetic and / or at least partially inductive element, which preferably comprises a magnetic material, and / or as a permanent magnetic element, and / or as (magnetically and / or inductively acting) material recess on the stator and / or rotor, and / or as an inductive electrical component, and / or designed as a magnetically or inductively acting material, and / or the like, and / or has at least one of these elements. In particular, therefore, in the context of the invention, a distinction is made between the (inductive) components, for example as stator windings, and the (magnetic) elements, such as permanent magnets on the rotor. The inductive components and / or the (magnetic and / or inductive) elements may preferably have a pronounced inductive behavior, that is to say in particular have a high inductance. In particular, the permeability (for example, of the elements) changes as a material property along the electrical angle or circumference of the rotor. Thus, the (rotor) inductance (longitudinal and transverse inductance) can also be changed and / or influenced. Preferably, the (magnetic) elements and / or the materials of the rotor and / or stator are different from each other, in particular with respect to their permeability. The rotor and / or stator can thus be preferably made magnetically anisotropic, preferably due to the arrangement of the elements and / or the construction of the electrical device. Thus, it is also conceivable that the elements are provided as material recesses on the rotor and / or stator, in particular to effect a corresponding magnetic anisotropy.

The elements preferably influence the inductance in the stator as a function of the rotor position in such a way that the rotor position (ambiguous) can be identified on the basis of the inductance curve over the circumference of the rotor. The arrangement and / or number of magnetic elements preferably determines the cycle of the evaluation and / or the unique position range. The arrangement of the markings preferably takes place in dependence on the arrangement of the (magnetic) elements. In particular, the markers are arranged such that the ambiguities of the evaluation result on the basis of Marking information can be resolved (ie eliminated, for example). The number of markings is preferably dependent on the number of magnetic elements such that at least one mark is provided for each of these elements (and / or every complete, unambiguous positional area). Thus, a clear determination of the situation can be done in a simple manner.

• – optischer Sensor, insbesondere als optischer Näherungsschalter oder Lichtschranke,
• – magnetischer Näherungsschalter,
• – elektrischer Näherungssensor,
• – Hallsensor.

According to a further possibility, it can be provided that the detection unit is embodied as a one-bit sensor and / or as at least one of the following sensors:

• - optical sensor, in particular as an optical proximity switch or light barrier,
• - magnetic proximity switch,
• - electrical proximity sensor,
• - Hall sensor.

The one-bit sensor is preferably a one-bit absolute value sensor, which preferably (only) provides information which states whether the marking is detected positively or negatively. For example, the detection unit is designed such that it provides a first signal when (positive) detection of the marker and (negative) detection (that is, for example, when detecting a negative marker or in the absence of detection of the marker), a second signal and / or no Signal supplies. The second signal can also be a failure of a signal. It is preferably provided that the electrical device comprises only a single detection unit. For example, the Hall sensors can detect the direction of the magnetic flux density of the existing permanent magnets and thus provide the marking information. The marking may be formed, for example, by the magnetic element of the rotors or of the stator itself or, in addition, may be attached to and / or formed on the rotor and / or stator. For example, it is conceivable that the marking is applied as a coating and / or is formed separately from the rotor or stator or the elements and is preferably fastened to the rotor and / or stator. Optionally, the marker is monolithic and / or integral with the element or separately formed therefrom.

• – eine Oberfläche der ersten Markierung heller als eine Oberfläche der zweiten Markierung ausgeführt ist, und/oder
• – eine Oberfläche der ersten Markierung reflektierender als eine Oberfläche der zweiten Markierung ausgeführt ist, und/oder
• – die erste Markierung eine magnetische Oberfläche und die zweite Markierung eine nicht magnetische Oberfläche aufweist, und/oder
• – ein räumlicher Abstand der ersten Markierung zur Erfassungseinheit geringer ist als ein räumlicher Abstand der zweiten Markierung zur Erfassungseinheit, und/oder
• – die erste Markierung materialunterschiedlich zur zweiten Markierung ausgeführt ist, wobei bevorzugt die erste Markierung ein Metall aufweist, und besonders bevorzugt die zweite Markierung ein anderes Metall oder Nichtmetall oder Halbmetall umfasst.

It is optionally conceivable that at least two markings are provided, wherein a first mark differs from a second mark at least in that

• A surface of the first marking is made lighter than a surface of the second marking, and / or
• A surface of the first marking is designed to be reflective as a surface of the second marking, and / or
• The first mark has a magnetic surface and the second mark has a non-magnetic surface, and / or
• - A spatial distance of the first mark to the detection unit is less than a spatial distance of the second mark to the detection unit, and / or
• - The first mark is carried out material different from the second mark, wherein preferably the first mark comprises a metal, and more preferably the second mark comprises another metal or non-metal or semimetal.

The first and / or second marking may be formed by the rotor and / or stator itself and / or arranged as a separate part thereto. This has the advantage that an ambiguity in the position detection can be resolved in a simple and cost-effective manner. In this case, the number of markings preferably corresponds to the number of ambiguities within one electrical period of the electrical device.

Likewise provided by the invention is a method for the operation of an electrical device, preferably for the operation of a drive element, in particular for a vehicle, preferably for an electric motor. Preferably, a stator and a rotor of the electrical device is provided, wherein the rotor is moved relative to the stator. Preferably, at least one inductive electrical component of the electrical device is provided, wherein an evaluation result is determined by an evaluation of the electrical component by at least one evaluation device (the electrical device), and a position of the rotor (rotor position) relative to the stator based on the evaluation result, in particular ambiguous , is determined. In this case, at least one marking (in particular of the rotor and / or stator) is preferably provided for determination of the position of the rotor, in particular fixedly or non-rotatably on the rotor and / or stator, the marking being dependent on the rotor position by a detection unit for determining marking information is detected, based on a combination of the evaluation result with the marking information, the position of the rotor is uniquely determined. Thus, the method according to the invention brings about the same advantages as have been described in detail with reference to an electrical device according to the invention. In addition, the method according to the invention may be suitable for the operation of an electrical device according to the invention.

The detection of the at least one marking by the detection unit thus determines in particular the marking information, wherein the marking information is preferably information about the position or position of the marking. As a result, it is preferably possible for the ambiguous evaluation result to be combined with the marking information of the detection unit in such a way that the ambiguity of the evaluation result is eliminated. In particular, an unambiguous position determination over the entire circumference of the rotor can be carried out, with the position determination preferably taking place without a rotor position. The evaluation device preferably serves to detect a change and / or an inductance curve of the inductance in and / or on the stator. The evaluation of the electrical component, in particular a stator inductance, preferably takes place over the entire stator circumference (for example 360 °). The orientation is based in particular on an evaluation of the different activities in the longitudinal and / or transverse axis. The method according to the invention is thus preferably a rotor position sensorless method for detecting the rotor position, and thus has the advantage that a reliable and simplified unambiguous detection of the rotor position is possible.

It is optionally provided that rotational speed information for the rotor rotation is determined during operation of the device on the basis of the detection of the marking by the detection unit, preferably by detection of time intervals of marking changes. The speed information can be used, for example, to supplement a positionless method in the higher speed range. This allows improved redundancy and / or fault diagnosis.

Furthermore, it is conceivable that the evaluation of the electrical component takes place in such a way that an induced voltage in the component and / or an inductance of the component and / or an inductance profile on the stator are detected and / or evaluated. The evaluation and / or determination of the position (rotational position) of the rotor by the evaluation device is based in particular on an evaluation of the different inductive electrical components, in particular inductors, on the stator (exclusively) in the longitudinal and / or transverse axis. As a result, the advantage is achieved that can be dispensed with a separate sensor for detecting the rotor position in the form of a rotor position sensor. For evaluation, the processing device and / or the evaluation device and / or the detection unit comprises, for example, at least one electrical and / or electronic component, such as a microprocessor, and preferably performs digital (signal) processing of a signal electrically detected at the inductive electrical component (in particular current - and / or voltage signal) and / or the evaluation result and / or the marking information. The evaluation result and / or the marker information are preferably provided as digital information and / or as an electrical signal.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. Show it:

1 - 3 a schematic view of parts of a device according to the invention,

4 a diagram to illustrate the ambiguous rotor position detection,

5 a schematic representation of parts of a device according to the invention,

6 another diagram illustrating the unique rotor position detection using the marker.

In the 1 to 3 are schematic parts of an electrical device according to the invention 10 shown, wherein different layers (that is, positions or rotational positions) of a rotor 30 the device according to the invention 10 are shown. The rotor 30 is for example rotatable in a stator 20 stored so that it is relative to the stator 20 is movable in different positions. In particular, the rotor-fixed dq coordinate system and the stator-fixed αβ coordinate system are also characterized. The rotor 30 further includes magnetic elements 35 , preferably permanent magnets 35 , wherein a first element 35a and a second element 35b you can see. The stator 20 includes several inductive electrical components 21 , which preferably as a stator winding 21 , in particular as an inductance or coil, are executed. By way of example, a first stator winding is used 21a , a second stator winding 21b and a third stator winding 21c shown. It is of course possible that other components 21 at the stator 20 and / or other magnetic elements 35 on the rotor 30 are provided. In particular, the components 21 can be electrically controlled and / or electrically evaluated to a movement of the rotor 30 to control or to determine an inductance.

The evaluation and in particular determination of the inductance of the component 21 may be preferred for detecting the position of the rotor 30 serve. Thus, for example, in a first measurement, which at a position of the rotor 30 according to 1 is performed, a first inductance value L0 be determined as an evaluation result. In a second measurement can be at a position of the rotor 30 according to 2 a second inductance value L1 and in a third measurement can be at a position of the rotor 30 according to 3 a third inductance value L2 through the evaluation of the electrical component 21 be determined.

The second inductance value L1 differs from the first inductance value L0, since the magnetic elements 35 (in particular permanent magnets 35 ) due to their magnetic permeability, the magnetic field in the rotor position according to the second measurement in 2 influence differently than in the rotor position according to the first measurement in 1 , By way of illustration, the different positions of the rotor are indicated by dashed arrows in FIGS 1 to 3 characterized in that the positions of the stator corresponding to the electrical components 21 with the numbers "1", "2" and "3" are highlighted.

In the third measurement according to 3 has the third inductance value L2 of the device 21 in the "1" position, however, the same value as the second measured inductance value L1 in the second measurement in 2 because of the influence of magnetic elements 35 on the magnetic circuit of the components 21 comparable in this situation.

The second measured inductance value L1 thus corresponds to the third measured inductance value L2 and differs from the first measured inductance value L0, as well as the representation in FIG 4 and 6 can be removed. In 4 and 6 is a diagram with the specific rotational position shown schematically. In this case, the abscissa axis Yu indicates the geometric circumference and the ordinate axis Y the specific rotational position. A first curve (continuous line, with a maximum value of 180 °) shows the ambiguous rotational position of the rotor determined according to the evaluation 30 , It also indicates the measured inductance values L1, L2 and L3. A second curve (dashed line, with a maximum value of 360 °), on the other hand, shows a clearly defined rotational position. In a rotorless sensor method, the inductance differences between L0 and L1 and L2 are used to determine the rotor position. From the diagram it can be seen that for the different rotor positions according to 2 and 3 the measured inductance values L1 and L2 are identical, so that the rotor position can initially only be determined ambiguously to 180 degrees.

In order to solve this problem, it is done according to 5 at least one mark 40 of the rotor 30 detected. For example, a first marker 40 . 41 a first unique location area 50 . 51 and a second mark 40 . 42 a second unique location area 50 . 52 to mark. The unique location area 50 is in accordance with 4 the area of the rotor 30 between a 0 ° and a 180 ° position or between a 180 ° and a 360 ° position. Of course, the arrangement of the markings 40 not limited to these locations. Especially if more magnetic elements 35 are present, that is, in a multi-pole electrical device 10 , you can add more tags 40 are used, and must according to the arrangement of the elements 35 to be ordered. Also, the arrangement of the markers 40 or the clear location areas 50 from a position of a detection unit 60 dependent. The registration unit 60 serves to detect the marking 40 , The marks 40 are therefore used to mark the unique locations 50 arranged such that the detection unit 60 a first mark 41 exactly over the first position range 50 . 51 detected, over which by the evaluation of the electrical component 21 still clearly the rotor position can be determined, with a change of the unique position range 50 also a change to another marker 40 he follows. Through the markings 40 becomes the rotor 30 in the scope marked in such a way that it passes over the registration unit 60 and based on a combination with the evaluation result over the entire circumference can be determined exactly in its location. Based on the mark 40 or by the detection unit 60 For example, a 180 ° accurate determination of the situation is possible. The orientation between the marks 40 and the elements 35 or permanent magnets 35 can in principle be arbitrary, but it must be known.

The marks 40 of the rotor 30 as well as the registration unit 60 can be used to unambiguously determine the rotor position based on the evaluation result. The combination of the evaluation result with the marking information is shown schematically in FIG 6 shown. For this the registration unit is 60 with an evaluation device 70 connected, which is the evaluation of the electrical components 21 performs. Furthermore, a drive device 80 be provided to the electrical components 21 electrically to drive and thus a movement of the rotor 30 to control. For this purpose, both the evaluation device 70 as well as the driving device 80 electrically with the respective electrical components 21 connected.

According to 7 becomes a method according to the invention 100 schematically visualized. In this case, according to a first method step 101 an evaluation of at least one inductive electrical component 21 for determining an evaluation result. According to a second method step 102 is by a detection unit 60 at least one mark 40 detected to determine a marker information. According to a third method step 103 A combination of the evaluation result with the marking information, the position of the rotor 30 to be clearly determined.

The above explanation of the embodiments describes the present invention solely by way of example. Of course, individual features of the embodiments, if technically feasible, can be combined freely with one another, without departing from the scope of the present invention.

LIST OF REFERENCE NUMBERS

10

 contraption

20

 stator

21

 Component, stator winding

21a

 first stator winding

21b

 second stator winding

21c

 third stator winding

30

 rotor

35

 Elements, permanent magnet

35a

 first element

35b

 second element

40

 mark

41

 first mark

42

 second mark

50

 Location area

51

 first location area

52

 second position range

60

 acquisition unit

70

 evaluation

80

 driving device

100

 method

101

 first process step

102

 second process step

103

 third process step

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0332244 A1 [0004]

Claims (11)

Electric device ( 10 ), comprising: - a stator ( 20 ) and a relative to the stator ( 20 ) movable rotor ( 30 ), - at least one inductive electrical component ( 21 ), - at least one evaluation device ( 70 ) for determining an evaluation result by an evaluation of the electrical component ( 21 ), wherein a position of the rotor ( 30 ) relative to the stator ( 20 ) is determinable on the basis of the evaluation result, characterized in that at least one marking ( 40 ) for determining the position of the rotor ( 30 ), the marking ( 40 ) by a detection unit ( 60 ) is detectable depending on the rotor position for determining a marking information, the position of the rotor being determined by a combination of the evaluation result with the marking information ( 30 ) is clearly determinable. Electric device ( 10 ) according to claim 1, characterized in that the marking ( 40 ) such, in particular fixed to the rotor ( 30 ), arranged that a first position of the rotor ( 30 ) of a second layer of the rotor ( 30 ) is distinguishable on the basis of the marking information, wherein a first evaluation result for the first position is identical to a second evaluation result for the second position. Electric device ( 10 ) according to claim 1 or 2, characterized in that at least one first mark ( 41 ) and a spatially adjacent second mark ( 42 ) are provided, each having a different unique position range ( 50 ) of the rotor ( 30 ), wherein preferably the position of the rotor ( 30 ) based on the evaluation result for the positions of the unique position range ( 50 ) is clearly identifiable, and in particular for the locations of different distinct locations ( 50 ) can only be determined ambiguously. Electric device ( 10 ) according to one of the preceding claims, characterized in that the stator ( 20 ) the electrical component ( 21 ) in the form of a stator winding ( 21 ), wherein the stator winding ( 21 ) for generating a magnetic field and / or for causing a movement of the rotor ( 30 ) is electrically controllable, and preferably electrically with the evaluation device ( 70 ) is connected such that the stator winding ( 21 ) by the evaluation device ( 70 ) on the ambiguous, in particular ambiguous, determination of the position of the rotor ( 30 ) is electrically evaluable. Electric device ( 10 ) according to one of the preceding claims, characterized in that a plurality, in particular at least two or three or four, markings ( 40 ) are provided, and the rotor ( 30 ) a plurality, preferably at least two or three or four, magnetic elements ( 35 ), in particular permanent magnets ( 35 ), wherein the number of markings ( 40 ) of the number of elements ( 35 ) is dependent. Electric device ( 10 ) according to one of the preceding claims, characterized in that the detection unit ( 60 ) is implemented as a one-bit sensor and / or as one of the following sensors: - optical sensor, in particular as an optical proximity switch or light barrier, - magnetic proximity switch, - electrical proximity sensor, - Hall sensor. Electric device ( 10 ) according to one of the preceding claims, characterized in that at least two markings ( 40 ) are provided, wherein a first mark ( 41 ) from a second marker ( 42 ) differs in that - a surface of the first mark ( 41 ) lighter than a surface of the second mark ( 42 ), and / or - a surface of the first mark ( 41 ) more reflective than a surface of the second mark ( 42 ), and / or - the first mark ( 41 ) a magnetic surface and the second mark ( 42 ) has a non-magnetic surface, and / or - a spatial distance of the first mark ( 41 ) to the registration unit ( 60 ) is less than a spatial distance of the second mark ( 42 ) to the registration unit ( 60 ), and / or - the first mark ( 41 ) Material different to the second mark ( 42 ), wherein preferably the first marking ( 41 ) has a metal, and particularly preferably the second marking ( 42 ) comprises another metal or non-metal or semimetal. Procedure ( 100 ) for the operation of an electrical device ( 10 ), with a stator ( 20 ) and a rotor ( 30 ), wherein the rotor ( 30 ) relative to the stator ( 20 ) is moved, and with at least one inductive electrical component ( 21 ), whereby at least one evaluation device ( 70 ) an evaluation result by an evaluation of the electrical component ( 21 ), and a position of the rotor ( 30 ) relative to the stator ( 20 ) is determined on the basis of the evaluation result, characterized in that at least one marking ( 40 ) for determining the position of the rotor ( 30 ), the marking ( 40 ) by a detection unit ( 60 ) is detected as a function of the position of the rotor, and a marking information depending on the detection of the marking ( 40 ) is determined, wherein based on a combination of the evaluation result with the marking information, the position of the rotor ( 30 ) is uniquely determined. Procedure ( 100 ) according to claim 8, characterized in that during operation of the device ( 10 ) based on the detection of the label ( 40 ) by the registration unit ( 60 ), preferably by a detection of time intervals of mark changes of at least two markings ( 40 ), a rotational speed information for the rotor rotation is determined. Procedure ( 100 ) according to claim 8 or 9, characterized in that the evaluation of the electrical component ( 21 ) such that an induced voltage in the device ( 21 ) and / or an inductance of the component ( 21 ) and / or an inductance curve on the stator ( 20 ) is detected and / or evaluated. Procedure ( 100 ) according to one of claims 8 to 10, characterized in that an electrical device ( 10 ) according to one of claims 1 to 7 is used.

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