Electrical machine, in particular for a motor vehicle

Abstract

The invention relates to an electrical machine, with a stator (10), with a rotor, with an air gap arranged between the stator (10) and the rotor, with a laminated core (14), with at least one winding (12) carried by the laminated core (14), by means of which a magnetic field can be generated, and with a sensor device (22) by means of which the magnetic field can be detected, wherein the sensor device (22) has at least one magnetic field sensor (24) arranged in a corresponding recess (26) in the laminated core (14), by means of which the magnetic field can be detected.

Description

[0001] The invention relates to an electrical machine, in particular for a motor vehicle, according to the preamble of patent claim 1.

[0002] DE 10 2007 028 482 A1 discloses a sensor arrangement having at least one sensor element arranged on at least one printed circuit board. Furthermore, DE 10 2005 004 322 A1 discloses an electrical machine having a stationary and a movable main element, as well as a sensor device for detecting a relative position of the movable main element to the stationary main element. Furthermore, DE 10 2007 060 241 A1 discloses an electrical machine having a stator, a rotor, and a sensor device for detecting a relative position between the stator and the rotor.

[0003] The object of the present invention is to provide an electrical machine, in particular for a motor vehicle, so that a magnetic field of the electrical machine can be detected in a particularly advantageous manner.

[0004] This object is achieved by an electrical machine having the features of patent claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] The invention relates to an electric machine, in particular for a motor vehicle. This means, for example, that the motor vehicle, also simply referred to as a vehicle and designed, for example, as a motor vehicle, in particular as a passenger car, in its fully manufactured state has the electric machine and can be driven, in particular purely electrically, by means of the electric machine. The electric machine has a stator and a rotor, which can be driven by means of the stator and is thus rotatable about an axis of rotation relative to the stator. In particular, the electric machine can provide drive torques for driving the motor vehicle via its rotor.Very preferably, the electrical machine is designed as a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. The electrical machine furthermore has an air gap arranged between the stator and the rotor, which air gap is arranged, for example, in particular when the electrical machine is designed as a radial flux machine (RFM), and therefore as a radial flux motor, in the radial direction of the electrical machine, the axial direction of which coincides with the axis of rotation and runs perpendicular to the radial direction of the electrical machine, between the stator and the rotor, in particular in such a way that the air gap in the radial direction of the machine is delimited on the one hand in particular directly by the stator and on the other hand in particular by the rotor.In particular, when the electrical machine is designed as a radial flux machine and as an external rotor, and therefore as an external rotor machine, the air gap is delimited in the radial direction of the electrical machine outwards, in particular directly by the rotor, and in the radial direction of the electrical machine inwards, in particular by the stator. In particular, when the electrical machine is designed as a radial flux machine and as an internal rotor, and therefore as an internal rotor machine, the air gap is delimited, for example, in the radial direction of the electrical machine inwards, in particular directly by the rotor, and in the radial direction of the electrical machine outwards, in particular directly by the stator.In particular, when the electrical machine is designed as an axial flux machine (AFM), thus as an axial flux motor, the air gap is arranged, for example, in the axial direction of the electrical machine between the rotor and the stator, in particular such that the air gap in the axial direction of the electrical machine is delimited, on the one hand, in particular directly by the rotor and, on the other hand, in particular directly by the stator.

[0006] The electric machine also has a laminated core. The electric machine furthermore has at least one winding which is supported by the laminated core. This means in particular that the winding is held on the laminated core and is thus supported by the laminated core. Thus, for example, the winding is wound around at least a partial area of ​​the laminated core. The laminated core and thus the winding can, for example, be components of the rotor, so that the laminated core is also referred to as the rotor laminated core and the winding is also referred to as the rotor winding. Particularly preferably, the laminated core and the winding are components of the stator, so that the laminated core is also referred to as the stator laminated core and the winding is also referred to as the stator winding. A magnetic field, in particular for driving the rotor, can be generated by means of the winding. This means that the rotor can be driven by means of the magnetic field and can therefore be rotated about the axis of rotation relative to the stator.The rotation axis is also called the machine rotation axis.

[0007] The electric machine further comprises a sensor device by means of which the magnetic field can be detected. In particular, a variable characterizing the magnetic field, i.e. describing or indicating it, such as a magnetic flux of the magnetic field, also referred to as magnetic flux, can be detected by means of the sensor device. Thus, for example, the magnetic flux of the magnetic field and thus the magnetic field can be measured, i.e. detected, by means of the sensor device. Since, for example, the magnetic field is or can be used to drive the rotor, the magnetic field is also referred to, for example, as the rotor magnetic field. In particular, the magnetic field, in particular the magnetic flux, can be measured by means of the sensor device, so that the detection or measuring of the magnetic field is also referred to as a magnetic field measurement or rotor magnetic field measurement.

[0008] In order to be able to detect, i.e. measure, the magnetic field and thus, for example, the magnetic flux in a particularly advantageous manner, the invention provides that the sensor device has at least one magnetic field sensor, also referred to as a sensor element or embodied as a sensor element, by means of which the magnetic field or the variable, i.e., in particular the magnetic flux, can be detected. Thus, for example, the magnetic flux can be measured, i.e., detected, by means of the magnetic field sensor. Furthermore, the invention provides that the laminated core has a recess corresponding to the magnetic field sensor, in which the magnetic field sensor is arranged, i.e., received, at least partially, in particular at least predominantly and thus at least more than half or completely.As a result, the magnetic field or the size can be detected, i.e. measured, particularly advantageously, in particular with a particularly high quality, so that, for example, the electrical machine can subsequently be operated particularly advantageously depending on the magnetic field detected by means of the magnetic field sensor.

[0009] The sensor device can, for example, provide a signal, in particular an electrical signal, which is also referred to as a sensor signal or measurement signal and which characterizes, i.e. describes or indicates, the magnetic field detected by the magnetic field sensor. In other words, the signal characterizes the variable detected, i.e. measured, by the magnetic field sensor. For example, an electronic computing device, also referred to as a control unit, is provided which can receive the signal. By means of the electronic computing device, the electrical machine can be operated, in particular controlled, as a function of the signal and thus as a function of the magnetic field detected by the magnetic field sensor, i.e. as a function of the variable detected by the magnetic field sensor.By arranging the magnetic field sensor in the recess, a particularly high quality of the signal can be achieved, so that the electrical machine can subsequently be operated, in particular controlled, with particularly high quality and in particular in a stable manner depending on the signal.

[0010] In order to be able to detect the magnetic field particularly advantageously and subsequently operate the electrical machine particularly advantageously depending on the detected magnetic field, one embodiment of the invention provides that the magnetic field sensor is designed to detect the magnetic field in the air gap. In other words, it is preferably provided that the magnetic field sensor can measure, i.e., detect, an air gap flux of the electrical machine, also referred to as magnetic air gap flux, wherein, for example, the air gap flux is part of the magnetic flux or describes part of the magnetic flux.Thus, for example, an air gap flux measurement can be carried out as a magnetic flux measurement using the sensor device, wherein during the air gap flux measurement the air gap flux, i.e. in particular the magnetic flux in the air gap, is measured, i.e. detected, by means of the sensor device, i.e. by means of the magnetic field sensor. In this case, it is provided, for example, that the magnetic field sensor is introduced into the air gap, i.e. in particular is arranged at least partially in the air gap. However, there is usually only very little space available in the air gap to arrange the magnetic field sensor there. Furthermore, there is a risk that, particularly because the rotor rotates at high speeds about the axis of rotation relative to the stator, the magnetic field sensor, especially if the magnetic field sensor is arranged in the air gap, will be displaced due to air turbulence after a prolonged period of operation of the electrical machine.This can now be avoided by arranging the magnetic field sensor in the recess of the laminated core, which is also referred to as a cutout or designed as a recess.

[0011] The background of the invention is, in particular, that the air gap flux, also referred to as the main flux or embodied as the main flux, is directly responsible for the drive torque that can be provided by the electric machine via the rotor. The invention now makes it possible to calculate the air gap flux using the magnetic field sensor, in particular directly, so that the air gap flux does not have to be calculated via a magnetic leakage flux of the electric machine, i.e., not via parameters characterizing the magnetic leakage flux of the electric machine. Furthermore, a particularly high quality of the measurement signal can be ensured, in particular with regard to a so-called signal-to-noise ratio of the signal.The signal-to-noise ratio is or describes a ratio of at least one usable piece of information contained in the signal to unusable noise in the signal. For example, the fact that the information is usable and the noise is unusable means that, with regard to the information and the noise, only the information can be used to operate, and in particular to control, the electrical machine in accordance with the information. In other words, the invention can prevent excessive interference with the signal due to interference fields, particularly compared to conventional solutions. Tests have shown that the invention can increase the quality of the measurement signal, in particular the signal-to-noise ratio, by a factor of approximately 10 compared to conventional solutions.

[0012] A further embodiment is characterized in that the sensor device comprises a circuit board formed separately from the laminated core and the magnetic field sensor, to which the magnetic field sensor is mounted. This allows the magnetic field to be detected particularly advantageously. The circuit board is also referred to as a printed circuit board or printed circuit card.

[0013] It has proven particularly advantageous if the magnetic field sensor arranged in the recess is located on a side of the circuit board facing the laminated core in the axial direction of the electrical machine. This allows the magnetic field, in particular the magnetic flux and especially the air gap flux, to be detected particularly advantageously.

[0014] In order to be able to measure, i.e. detect, the magnetic field, in particular the magnetic flux and very particularly the air gap flux, particularly advantageously, a further embodiment of the invention provides that the recess is delimited, in particular closed, in the axial direction of the electrical machine on the one hand by a wall region of the laminated core and on the other hand by the circuit board, in particular completely and / or directly. The recess is formed, for example, in the following way: The laminated core has, for example, a plurality of laminated core segments which are arranged successively in the axial direction of the electrical machine and are in particular formed separately from one another. At least a first of the laminated core segments, in particular a plurality of first of the laminated core segments, has or have a, in particular respective, through-opening which is produced, for example, by punching the, in particular respective, first laminated core segment.In this case, for example, the plurality of first lamination segments are arranged one after the other in the axial direction of the electrical machine in such a way that the through-openings of the first lamination segments overlap one another and thereby form the recess. If only or exactly one first lamination segment is provided, the through-opening of exactly or only one first lamination segment forms the recess. In the axial direction of the electrical machine, a second of the lamination segments of the laminated core adjoins the first lamination segment or the first lamination segments, wherein the second lamination segment has the aforementioned wall region by which the recess is delimited, in particular completely and / or directly, and in particular closed in the axial direction of the electrical machine.In the axial direction of the electrical machine, on the other hand, the first sheet metal segments or the first sheet metal segment are adjoined by the circuit board, which, on the other hand, delimits, in particular completely and / or directly, in particular closes, the recess in the axial direction of the electrical machine. Thus, for example, the magnetic field sensor arranged in the recess is arranged in the axial direction of the electrical machine between the circuit board and the wall region and thus the second sheet metal segment. Furthermore, the magnetic field sensor is arranged on a side of the circuit board facing the wall region and thus in particular the second sheet metal segment in the axial direction of the electrical machine. As a result, the magnetic field, in particular the magnetic flux and very particularly the air gap flux, can be measured, i.e. detected, particularly advantageously by means of the magnetic field sensor.

[0015] The first sheet metal segments are or form, for example, upper layers of the laminated core, wherein, for example, the through-openings are produced by punching and are thus punched out of the upper layers. In particular, after the through-openings have been produced in the first sheet metal segments, the first sheet metal segments are arranged successively in the axial direction of the laminated core and thus of the electrical machine, so that the through-openings overlap one another and form the recess. For example, the circuit board has a very similar shape or the same shape as the sheet metal segments, whereby the circuit board can be integrated into the laminated core in a particularly space-saving manner. In particular, for example, in a method for producing the electrical machine, the magnetic field sensor is attached to the circuit board in the direction of the sheet metal segments and is arranged in the recess.In this way, the magnetic field, in particular the magnetic flux and especially the air gap flux, can be detected particularly advantageously.

[0016] In order to be able to detect the magnetic field particularly advantageously and subsequently operate, in particular control, the electrical machine particularly advantageously as a function of the detected magnetic field, a further embodiment of the invention provides that a further magnetic field sensor of the sensor device is arranged on a second side of the circuit board facing away from the aforementioned side of the circuit board in the axial direction of the electrical machine, wherein the magnetic field can be detected by means of the further magnetic field sensor. For example, a leakage flux of the electrical machine, also referred to as magnetic leakage flux, can be measured, i.e. detected, by means of the further magnetic field sensor, wherein the magnetic leakage flux is part of the magnetic flux or describes part of the magnetic flux.Thus, for example, a leakage flux measurement can be performed using the additional magnetic field sensor, in which the leakage flux is measured, i.e., detected, using the additional magnetic field sensor. For example, the electronic computing device can operate, in particular control, the electrical machine depending on the measured leakage flux, thereby enabling particularly advantageous operation of the electrical machine.

[0017] In a further, particularly advantageous embodiment of the invention, the sensor device comprises at least one second magnetic field sensor, spaced apart from the magnetic field sensor, provided in addition to the magnetic field sensor, and arranged in a second corresponding recess of the laminated core, provided in addition to the recess and spaced apart from the recess, by means of which the magnetic field, in particular the magnetic flux and very particularly the air gap flux, can be detected, i.e., measured. This allows the magnetic field to be detected particularly advantageously.

[0018] It has proven particularly advantageous if the magnetic field sensors, i.e. if the first magnetic field sensor and the second magnetic field sensor, are arranged on the same side of the aperture, whereby the magnetic flux, in particular the air gap flux, can be detected particularly advantageously.

[0019] In order to be able to measure the magnetic field, in particular the magnetic flux and especially the air gap flux, particularly advantageously, it is provided in a further embodiment of the invention that the magnetic field sensors and thus also the recesses of the laminated core are spaced from one another and arranged one after the other in the circumferential direction of the electrical machine running around the axis of rotation and thus around the axial direction of the electrical machine.

[0020] Finally, it has proven particularly advantageous for achieving a particularly advantageous measurement of the magnetic field if the recess is completely bounded, in particular directly, by a wall of the laminated core in the radial direction of the electric machine, inwardly and thus toward the air gap. This can, for example, prevent the magnetic field sensor from being undesirably misplaced, especially when the rotor rotates at a high speed relative to the stator, thus causing strong air turbulence.

[0021] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0022] The drawing shows: Fig. 1 a schematic perspective view of a stator of an electrical machine, in particular for a motor vehicle; Fig. 2 a schematic perspective view of a laminated core of the stator; Fig. 3 a schematic perspective view of a sheet segment of the laminated core; and Fig. 4 a schematic plan view of a sensor device of the electrical machine.

[0023] In the figures, identical or functionally identical elements are provided with the same reference numerals.

[0024] Fig. 1 shows a schematic perspective view of a stator 10 of an electrical machine, in particular of a motor vehicle. This means that the motor vehicle, also simply referred to as a vehicle and designed, for example, as a motor vehicle, in particular as a passenger car, in its fully manufactured state has the electrical machine and can be driven, in particular purely electrically, by means of the electrical machine. Preferably, the electrical machine is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. In its fully manufactured state, the electrical machine has the stator 10 and anot shown rotor, which can be driven by means of the stator 10 and is thus rotatable relative to the stator 10 about a machine rotation axis 34 of the electric machine, the axial direction of which coincides with the machine rotation axis 34. In particular, the electric machine, whose radial direction runs perpendicular to the axial direction of the electric machine and thus perpendicular to the machine rotation axis 34, can provide drive torques for driving the motor vehicle via its rotor.

[0025] The electrical machine, in particular the stator 10, has at least one winding 12, by means of which a magnetic field, in particular with a magnetic flux, also simply referred to as flux or magnetic flux, can be generated. The winding 12 is very preferably designed according to hairpin technology, also referred to as hairpin technology, and is therefore also referred to as a hairpin winding. Since the winding 12 is a winding of the stator 10, the winding 12 is also referred to as a stator winding. The stator 10 and thus the electrical machine have a laminated core 14, on which the winding 12 is held. Thus, the winding 12 is carried by the laminated core 14. The axial direction of the electrical machine and thus of the stator 10 is in Fig. 1 by a double arrow 16. For example, the laminated core 14 is formed from several separate and interconnected sheet segments, in particular pressed together. Fig. 1 shows that respective length regions L of the winding 12 on a first axial end face AS1 of the laminated core 14 protrude from the laminated core 14, in particular from the axial end face AS1 of the laminated core 14, in the axial direction of the electrical machine and thus of the laminated core 14 and of the stator 10, whereby the length regions L form at least one winding head 18 of the winding 12 arranged on the axial end face AS1. The laminated core 14 also has, for example, a second axial end face AS2 facing away from the first axial end face AS1 in the axial direction of the electrical machine and thus of the laminated core 14 and of the stator 10.In this case, it is conceivable, for example, that on the second axial end face AS2, second length regions L2 of the winding 12 protrude in the axial direction of the electrical machine and thus of the stator 10 and the laminated core 14 from the laminated core 14, in particular from the axial end face AS2 of the laminated core 14, whereby, for example, the length regions L2 on the second axial end face AS2 form a second winding head 20 of the winding 12.

[0026] Furthermore, the electric machine has an air gap (not visible in the figures) arranged between the rotor and the stator 10, which is arranged, for example, in the radial direction of the electric machine between the stator 10 and the rotor, in particular between the laminated core 14 and the rotor. The radial direction of the electric machine and thus of the stator 10 and the laminated core 14 runs perpendicular to the axial direction of the electric machine and thus of the stator 10 and the laminated core 14 and is Fig. 1 is illustrated by a double arrow 32.

[0027] The electric machine also has a particularly good Fig. 4 has a sensor device 22, which can be seen, by means of which the magnetic field, in particular the magnetic flux, can be detected, i.e. measured.

[0028] In order to be able to detect, i.e. measure, the magnetic field, in particular the magnetic flux and especially a magnetic air gap flux in the air gap, particularly advantageously, the sensor device 22 has at least one magnetic field sensor 24 ( Fig. 4), by means of which the magnetic field, in particular the magnetic flux and especially the air gap flux, can be detected and thus measured. The magnetic field sensor 24 is in a corresponding recess 26 ( Fig. 2) of the laminated core 14. The aforementioned air gap flux is or describes a part of the magnetic flux and can be particularly advantageously detected, for example, by means of the magnetic field sensor 24.

[0029] In Fig. 2, the sheet metal segments of the laminated core 14 are visible, with the first of the sheet metal segments being designated 28 and a second of the sheet metal segments being designated 30. In Fig. 3 shows one of the first sheet metal segments 28. Fig. 2 and Fig. 3 it can be seen that the respective first sheet metal segment 28 has a respective through-opening 36, which is produced, for example, by punching. Fig. 3 that the respective through-opening 36 runs completely around its circumferential direction and is directly delimited by the respective first lamination segment 28. The respective circumferential direction of the respective through-opening 36 runs in a plane which is perpendicular to the axial direction of the electrical machine. The lamination segments 28 and 30 are arranged one after the other in the axial direction of the electrical machine, wherein the lamination segments 28 are arranged one after the other in the axial direction of the electrical machine such that the through-openings 36 overlap one another and thereby form the recess 26. The first lamination segments 28 form a first lamination stack part 38, which has, for example, the recess 26. In the axial direction of the electrical machine, the second lamination segment 30 adjoins the lamination stack part 38 on the one hand.In other words, the second laminated core part 38 is adjoined, in particular directly, by the second laminated core segment 30 in a first direction, illustrated by an arrow 40, running parallel to the axial direction of the electrical machine or coinciding with the axial direction of the electrical machine. The second laminated core segment 30 has a wall region, not visible in the figures, which adjoins the laminated core part 38 and the recess 26 in the first direction, illustrated by the arrow 40, in such a way that the recess 26 is completely and directly delimited by the said wall region in the first direction, illustrated by the arrow 40, and is thereby in particular closed. On the other hand, a circuit board 42 of the sensor device 22 adjoins the laminated core part 38 in the axial direction of the electrical machine. Fig. 4 it can be seen that the sensor device 22 has the circuit board 42 on which the magnetic field sensor 24 is held. In Fig.2, an arrow 44 illustrates a second direction opposite to the first direction, which runs in the axial direction of the electrical machine and thus of the stator 10 and the laminated core 14 or coincides with the axial direction of the electrical machine. The printed circuit board 42 adjoins the laminated core part 38 and in particular the recess 26 in the second direction, in particular such that the recess 26 is delimited in the second direction, in particular completely and directly, by the printed circuit board 42 and is thus closed. The magnetic field sensor 24 is arranged in the recess 26, in particular completely, so that the magnetic field sensor 24 is arranged in the axial direction of the electrical machine between the printed circuit board 42 and the aforementioned wall region of the second laminated core segment 30.Thus, the magnetic field sensor 24 is arranged on a first side S1 of the circuit board 42, the first side S1 of which faces the wall region and thus the second sheet metal segment 30 in the axial direction of the electrical machine and in the first direction. The first side S1 of the circuit board 42 faces away from a second side S2 of the circuit board 42 in the axial direction of the electrical machine and in the first direction, so that the second side S2 faces away from the laminated core part 38, the magnetic field sensor 24, the wall region, and the second sheet metal segment 30 in the axial direction of the electrical machine and thus in the second direction (arrow 44).In principle, it would be conceivable for at least one further magnetic field sensor of the sensor device 22 to be arranged on the second side S2 and held on the circuit board 42, wherein the magnetic field, in particular the magnetic flux and very particularly a magnetic leakage flux of the electrical machine, can be measured, for example, by means of the further magnetic field sensor. The circuit board 42 is formed separately from the laminated core 14 and separately from the magnetic field sensor 24. Thus, for example, in addition to an air gap flux measurement, by means of which or during which the air gap flux can be or is detected by means of the magnetic field sensor 24, a leakage flux measurement can be carried out, by means of which or during which the leakage flux can be or is detected by means of the further magnetic field sensor. List of reference symbols 10 Stator 12 windings 14 sheet package 16 Double arrow 18 winding head 20 winding head 22 Sensor device 24 Magnetic field sensor 26 Recess 28 first sheet segment 30 second sheet segment 32 double arrow 34 Machine rotation axis 36 passage opening 38 laminated core part 40 Arrow 42 circuit board 44 Arrow AS1 first axial face AS2 second axial face L length range L2 second length range S1 first page S2 second page QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] DE 10 2007 028 482 A1

[0002] DE 10 2005 004 322 A1

[0002] DE 10 2007 060 241 A1

[0002]

Claims

[1] Electrical machine, with a stator (10), with a rotor, with an air gap arranged between the stator (10) and the rotor, with a laminated core (14), with at least one winding (12) carried by the laminated core (14), by means of which a magnetic field can be generated, and with a sensor device (22) by means of which the magnetic field can be detected, characterized by that the sensor device (22) has at least one magnetic field sensor (24) arranged in a corresponding recess (26) of the laminated core (14), by means of which the magnetic field can be detected. [2] Electrical machine according to claim 1, characterized by that the magnetic field sensor (24) is designed to detect the magnetic field in the air gap. [3] Electrical machine according to one of claims 1 or 2, characterized bythat the sensor device (22) has a circuit board (42) which is formed separately from the laminated core (14) and separately from the magnetic field sensor (24), on which circuit board the magnetic field sensor (24) is held. [4] Electrical machine according to claim 3, characterized by that the magnetic field sensor (24) arranged in the recess (26) is arranged on a side (S1) of the circuit board (42) facing the laminated core (14) in the axial direction (16) of the electrical machine. [5] Electrical machine according to claim 3 or 4, characterized byin that the recess (26) is delimited in the axial direction (16) of the electrical machine on the one hand by a wall region of the laminated core (14) and on the other hand by the circuit board (42), wherein the magnetic field sensor (24) arranged in the recess (26) is arranged in the axial direction (16) of the electrical machine between the circuit board (42) and the wall region and thus on a side (S1) of the circuit board (42) facing the wall region in the axial direction (16) of the electrical machine. [6] Electrical machine according to claim 5, characterized by that on a second side (S2) of the circuit board (42) facing away from the side (S1) in the axial direction (16) of the electrical machine, a further magnetic field sensor of the sensor device (22) held on the circuit board (42) is arranged, wherein the magnetic field can be detected by means of the further magnetic field sensor. [7] Electrical machine according to one of the preceding claims, characterized bythat the sensor device (22) has at least one second magnetic field sensor, which is provided at a distance from the magnetic field sensor (24), in addition to the magnetic field sensor (24) and arranged in a second corresponding recess of the laminated core (14) which is provided in addition to the recess (26) and at a distance from the recess (26), by means of which second magnetic field sensor the magnetic field can be detected. [8] Electrical machine according to claim 7, characterized by that the magnetic field sensors (24) are arranged on the same side (S1) of the circuit board (42). [9] Electrical machine according to claim 7 or 8, characterized by that the magnetic field sensors (24) are spaced apart from one another in the circumferential direction of the electrical machine. [10] Electrical machine according to one of the preceding claims, characterized bythat the recess (26) is completely delimited in the radial direction (32) of the electrical machine inwards and thus towards the air gap by a wall of the laminated core (14).

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