Electric motor and circuit board

Abstract

The invention relates to an electric motor (1) having at least a stator (2) and a ring-shaped rotor (3) arranged side by side along an axial direction (4); wherein the stator (2) has a plurality of stator teeth (6) arranged side by side along a circumferential direction (5) and each extending along the axial direction (4); wherein at each stator tooth (6) at least one coil (7) with at least one winding (8) is arranged; wherein the at least one winding (8) is electrically conductively connected with a circuit board (9), wherein the circuit board (9) is arranged at an end side (10) of the stator (2) and alongside the stator (2) along the axial direction (4), wherein the circuit board (9) comprises a plurality of electrical connection lines (11) via which at least one winding (8) of each coil (7) is connected with at least one other winding (8) or with an electrical connection (12, 13) of the motor.

Description

Technical Field

[0001] This invention relates to an electric motor, wherein the electric motor includes at least one stator and a rotor. The electric motor is an axial flux motor (AFM). The invention also relates to a circuit board for the electric motor. Background Technology

[0002] The stator has a plurality of stator teeth arranged side by side along the circumferential direction and extending respectively along the axial direction. The motor has windings. The windings include multiple coils. At each stator tooth is arranged at least one coil with at least one winding, and more particularly multiple windings.

[0003] An electric motor may have a circuit board, especially a PCB (printed circuit board), in which electrical connection lines are arranged.

[0004] The coil windings are electrically connected to a circuit board, which is located at the end of the stator and alongside the stator along the axial direction.

[0005] Electrical interconnection of individual coils and coils with electrical connections is achieved via connection lines on a circuit board. However, at least one winding of each coil, and especially multiple windings, can also be interconnected with each other or connected to electrical connections via the circuit board. Current is supplied to the windings via the electrical connections.

[0006] The connection lines in the circuit board extend at least partially in at least one plane transverse to the axial direction, wherein each connection line is associated with an electrical connection portion and with at least one stator tooth, and is positioned along the axial direction at least partially aligned with a coil disposed at the corresponding stator tooth. The connection lines often extend integrally in sections disposed between two adjacent stator teeth and extending in the radial direction.

[0007] Axial flux motors are known, for example, from DE 10 2019 112 768 A1.

[0008] There is a persistent need to improve electric motors and their structure. Improved interconnection of the individual coils (e.g., simplified assembly and cost-effective) is one potential area for improvement. The use of circuit boards or PCBs can be advantageous, especially when they can be positioned near the coils. However, positioning the circuit board near the stator carries the risk that alternating magnetic fields act on the current-carrying conductors and eddy currents are introduced into the circuitry. In particular, the formation of eddy currents during motor operation should be considered when designing the electric motor. Summary of the Invention

[0009] The objective of this invention is thus to provide an electric motor and a circuit board capable of achieving these aspects. In particular, an electric motor and a circuit board will be described, wherein eddy currents, especially those in the circuit board, occur to the minimum possible extent during the operation of the motor.

[0010] To address these tasks, an electric motor according to the invention and a circuit board according to the invention are proposed. The individual features listed in the claims can be combined with each other in a technically meaningful manner and can be further elaborated by the illustrative facts in the specification and the details in the drawings, wherein further embodiments of the invention are shown.

[0011] An electric motor is used to facilitate this process, having at least a stator and an annular rotor arranged side-by-side along the axial direction. The stator has a plurality of stator teeth arranged side-by-side along the circumferential direction and extending respectively along the axial direction. At each stator tooth is arranged at least one coil with at least one winding, particularly multiple windings. At least one winding (of each coil) is electrically connected to a circuit board, wherein the circuit board is located at the end side of the stator and arranged axially alongside the stator (and, where necessary, at least partially overlapping the stator teeth). The circuit board includes a plurality of electrical connection lines, via which at least one winding of each coil is connected to at least other windings or to an electrical connection portion of the electric motor. These connection lines extend at least partially in at least one plane transverse to the axial direction within the circuit board. Each connection line is associated with an electrical connection portion and, respectively, with at least one stator tooth. At least one section of the at least one connection line is divided into a plurality of sub-lines, wherein the sub-lines are arranged electrically insulated from each other within the section.

[0012] In an axial flux motor, the stator and rotor are arranged side-by-side along the axial direction. The rotor has magnets and poles that are positioned opposite to coils or stator teeth along the axial direction and, if necessary, aligned at least along the axial direction (i.e., on the same diameter). The stator has stator teeth and coils extending axially from an annular base (yoke). The number of coils or stator teeth and the number of rotor poles (e.g., magnets or permanent magnets) can be different from or correspond to each other.

[0013] In axial flux motors, the rotor is essentially driven by the axially oriented component of the magnetic flux generated by the stator.

[0014] The stator of an electric motor is particularly made of soft magnetic materials, such as so-called "soft magnetic composite material" (SMC), or a combination of electrical board and SMC. The stator teeth are preferably made of soft magnetic material by pressing and baking. The SMC material is not sintered here. Instead, it is tempered at a temperature below the melting temperature, however, sufficient to allow the core to maintain its geometry for a long time.

[0015] The corresponding rotor, for example, has permanent magnets and / or soft magnetic elements in the recess. Preferably, permanent magnets can be used to form a permanently excited synchronous or brushless DC motor, abbreviated as BLDC, while soft magnetic elements can be used to provide a reluctance motor as an electric motor.

[0016] The corresponding rotor can be implemented as a squirrel-cage rotor, a short-circuit rotor, or a slip ring rotor, in which case an asynchronous motor is constructed.

[0017] In particular, the rotor is manufactured at least in part using sintering technology. In particular, sintering technology allows for the very simple construction of complex structures at the rotor.

[0018] The motor has electrical connections through which current can be applied to the stator or coils, particularly multiphase current, preferably three-phase current. The motor is then connected to at least one phase via each connection. Coils or windings arranged at the stator teeth are respectively assigned to a phase or are simultaneously connected to the same connection.

[0019] Current is supplied from the connecting part toward the connecting part, and the connecting part is electrically connected to the coil via the connecting part.

[0020] The conductive connection of the connector is made via a circuit board or a connection line constructed in the circuit board.

[0021] In circuit boards (especially PCBs), interconnecting lines are constructed, particularly via printing methods. This typically results in a planar structure with a smaller extension in the axial direction but a significantly larger extension in the radial and circumferential directions. The interconnecting lines are then encased in the electrically insulating material (e.g., plastic or resin) of the circuit board along their extensions.

[0022] It is currently proposed that the interconnects extending into the circuit board be implemented, at least partially, particularly advantageously. The special design of these interconnects should help reduce the occurrence of eddy currents, especially significantly reduce them.

[0023] The connecting lines extend at least partially in at least one plane, and if necessary, multiple planes, transverse to the axial direction in the circuit board. The planes are spaced apart from each other along the axial direction or at least offset from each other along the axial direction.

[0024] Each connection line is associated with an electrical connection or a phase of a multiphase current and is respectively matched with at least (or exactly) one stator tooth (or at least one coil arranged at that stator tooth).

[0025] The connecting lines can be positioned along the axial direction, at least partially aligned with the coils arranged at the corresponding stator teeth. This allows (particularly easily) contact between each coil or winding and the connecting lines associated with that coil. This contact is particularly achieved via axially extending lines that extend at least partially along the axial direction from the wall toward the circuit board.

[0026] In a circuit board, contact lines extend particularly along the axial direction, whereby the contact lines connect the various connection lines arranged on different planes of the circuit board to each other.

[0027] Due to the arrangement of the connecting lines at least partially aligned with the coils, the stator teeth can extend at least into the circuit board or extend through the circuit board in the axial direction. In particular, the circuit board has corresponding openings or through-holes for the stator teeth.

[0028] It is proposed that at least one segment of at least one connecting line is divided into a plurality of sub-lines, wherein the sub-lines are arranged electrically insulated from each other (e.g., by means of the material described above on the circuit board) only within the segment.

[0029] The sub-circuits of the connecting line are electrically connected in parallel to each other, that is, they are collectively assigned to a phase of a multiphase current. At least in this section, dividing the connecting line into multiple sub-circuits results in a significant reduction in eddy current losses during motor operation.

[0030] In particular, the circuit board is arranged axially between the stator and the rotor. It is in this design of the motor (which is chosen, for example, due to assembly conditions) that eddy current losses can be significantly reduced by dividing the connecting lines into sub-lines, at least in said section. The circuit board can be used to support the stator and absorb the axial forces acting on the stator from the rotor and discharge them into the housing, for example, through the shape fit between the circuit board and the motor housing.

[0031] In particular, the rotor has multiple magnets. The section is arranged at least in the area of ​​the circuit board such that the magnets can be arranged aligned with the area along the axial direction during motor operation.

[0032] During the operation of the motor, the rotor's magnets move relative to the rotor, particularly along a circular track, wherein the magnets move only in an annular region of the circuit board that is aligned with the magnets in the axial direction.

[0033] It is in this region that the strongest eddies occur, which can be reduced at least by dividing the connecting lines into sub-lines.

[0034] In particular, at least one sub-line extending between the first and second ends along the extension direction, preferably all sub-lines, have a width of up to 1.5 mm, preferably up to 1.0 mm, particularly preferably up to 0.5 mm or even up to 0.2 mm, extending transversely to the extension direction (and transversely to the axial direction, i.e., in the circumferential direction and / or in the radial direction).

[0035] In particular, the height of the sub-line and / or connecting line in the circuit board extending in the axial direction is at most 1.0 mm, especially at most 0.5 mm, particularly preferably 0.3 mm or even at most 0.2 mm.

[0036] In particular, the sub-lines belonging to different connection lines extend at least partially in planes that are different from each other in the circuit board and are at least offset from each other in the axial direction.

[0037] In particular, the connecting lines or sub-lines arranged in at least different planes are electrically connected to each other via contact lines extending axially in the circuit board. The contact lines have a cross-section that has at most 100%, especially at most 80%, and preferably at most 50% of the cross-section of the sub-line connected to the corresponding contact line.

[0038] In particular, at least a portion of the sub-line extends in at least one segment of the connecting line in planes that are different from each other and at least offset from each other in the axial direction on the circuit board.

[0039] In particular, the sub-circuit is electrically connected to other sub-circuit of the connecting line only outside the stated section.

[0040] In particular, the sub-circuit is electrically connected to other sub-circuit of other connecting lines or to other connecting lines only outside the said section via contact lines.

[0041] In particular, at least one connecting line extends at least partially around the stator teeth from a first connecting portion to a second connecting portion at one of the connecting portions, wherein the connecting line is also divided into sub-lines outside the section.

[0042] In particular, the connecting lines are divided into sub-lines or constructed in the form of sub-lines along their entire extension in the circuit board.

[0043] In particular, only one or only two ends of the connecting line are electrically joined and thus connected to (correspondingly) a connector.

[0044] In particular, each sub-line in the circuit board extends along only one plane.

[0045] In particular, at least one connecting line is divided into at least three sub-lines in the section, preferably into at least four, and particularly preferably at least five or six or even more sub-lines.

[0046] Contact lines can have a circular (e.g., perfectly circular or elliptical) cross-section.

[0047] In particular, the contact lines have a non-circular cross-section. Preferably, the contact lines have, for example, a angular, preferably rectangular cross-section.

[0048] In particular, the extension of the contact line cross-section parallel to the direction of the winding and / or sub-line is greater than the extension transverse to the direction of the winding and / or sub-line.

[0049] A circuit board for an electric motor, and in particular for the electric motor described herein, is also proposed.

[0050] The motor has at least a stator and an annular rotor arranged side-by-side along the axial direction. The stator has a plurality of stator teeth arranged side-by-side along the circumferential direction and extending respectively along the axial direction. At least one coil with at least one winding, and in particular multiple windings, is arranged at each stator tooth. At least one winding (of each coil) is electrically connected to a circuit board, wherein the circuit board is arranged at the end side of the stator and along the axial direction next to the stator (and, if necessary, at least partially overlapping the stator teeth).

[0051] The circuit board includes multiple electrical connection lines, through which at least one winding of each coil is connected to at least other windings or to an electrical connection of an electric motor. These connection lines extend at least partially in at least one plane transverse to the axial direction within the circuit board. Each connection line mates with an electrical connection and with at least one stator tooth. At least one section of at least one connection line is divided into multiple sub-lines, wherein the sub-lines are arranged electrically insulated from each other within said section.

[0052] The same principles applied to motors are equally true for circuit boards, and vice versa.

[0053] The use of the indefinite article (“a”, “an”), especially in the claims and the description reflecting the claims, should be understood as an indefinite article rather than a numeral. Accordingly introduced terms or components should therefore be understood to mean that the term or component exists at least once, and in particular, but may also exist multiple times.

[0054] It should be noted, as a precaution, that the numerals used herein (“first,” “second,” “third,” etc.) are primarily (only) used to distinguish multiple objects, sizes, or processes of the same type, i.e., in particular, not to presuppose any relational and / or order of these objects, sizes, or processes relative to each other. If a relational and / or order is required, this is expressly stated herein or will be apparent to those skilled in the art when studying the specifically described embodiments. Attached Figure Description

[0055] The invention and its technical environment are explained in more detail below with reference to the accompanying drawings. It should be noted that the invention is not limited to the embodiments shown. In particular, unless explicitly stated otherwise, certain aspects of the facts illustrated in the drawings can be extracted and combined with other components and understandings in this specification and / or the drawings. The same reference numerals denote the same objects, thus the illustrations in other drawings can be supplemented as necessary. Wherein, schematically: Figure 1 A portion of the electric motor is shown in perspective. Figure 2 The sectional side view shows the results according to Figure 1 Electric motor; Figure 3 The sectional side view shows the results according to Figure 1 and Figure 2 Electric motor; Figure 4 A known circuit board for an electric motor is shown in a sectional top view; Figure 5 The sectional side view shows the results according to Figures 1 to 3 An electric motor in operation; Figure 6 A sectional top view shows the structure based on... Figure 4 The motor on the circuit board; Figure 7 A motor with other circuit boards is shown in a sectional top view; Figure 8 A motor with a circuit board is shown in a sectional top view; Figure 9 The sectional side view shows the results according to Figure 8 The motor's circuit board; Figure 10 The first perspective view shows the following based on Figure 8 The motor; Figure 11 The second perspective view shows the following based on Figure 8 The motor; Figure 12 The perspective view shows the results based on Figure 8 The stator of the motor; Figure 13 The third perspective view shows the results based on Figure 8 The motor; Figure 14 The fourth perspective view shows the results based on Figure 8 The motor; Figure 15 The sectional side view shows the results according to Figure 8 The motor; Figure 16 The sectional top view shows the data according to... Figure 4 Known circuit boards; Figure 17 The first implementation variant is shown in a sectional side view. Figure 16 Circuit board; Figure 18 The second implementation variant is shown in the following way. Figure 9 Circuit boards; and Figure 19 The diagram is shown in sectional top view and sectional side view according to... Figure 9 A portion of circuit board 9. Detailed Implementation

[0056] Figure 1 A portion of the electric motor 1 is shown in perspective. Figure 2 The sectional side view shows the results according to Figure 1 1. Electric motor. Figure 3 The sectional side view shows the results according to Figure 1 and Figure 2 1. Electric motor. Figure 4 A known circuit board 9 for electric motor 1 is shown in a sectional top view. Figure 5 The sectional side view shows the results according to Figures 1 to 3 The electric motor 1 in operation. Figure 6 A sectional top view shows the structure based on... Figure 4 The circuit board 9 and motor 1. The following describes them together. Figures 1 to 6 .

[0057] Motor 1 has a stator 3 and an annular rotor 2 arranged side-by-side along an axial direction 4. The stator 3 has a plurality of stator teeth 6 arranged side-by-side along a circumferential direction 5 and extending respectively along the axial direction 4. A coil 7 with at least one winding 8 or more windings 8 is arranged at each stator tooth 6. The windings 8 are electrically connected to a circuit board 9, which is arranged at an end side 10 of the stator 2 and adjacent to the stator 2 along the axial direction 4. The circuit board 9 includes a plurality of electrical connection lines 11, through which the windings 8 are interconnected and connected to electrical connection points 12, 13 of the electric motor 1. These connection lines 11 are located in the circuit board 9 in a plurality of planes 14, 15, 16 transverse to the axial direction 4 (according to...). Figure 2 For example, it extends in the first plane 14 and the second plane 15. Each connecting line 11 is associated with an electrical connection portion 12, 13 and is respectively associated with at least one stator tooth 6, and is positioned along the axial direction 4 at least partially aligned with a coil 7 arranged at the corresponding stator tooth 6 (see...). Figure 4 ).

[0058] In circuit board 9, the connecting line 11 is implemented as a surface structure (see...). Figure 4 The surface structure is in the axial direction 4 (see...) Figure 2 and Figure 3 The circuit 11 has a small extension on the surface, but a significantly larger extension in the radial direction 17 and the circumferential direction 5. The connecting line 11 is embedded along its extension into the electrical insulating material (e.g., plastic or resin) of the circuit board 9.

[0059] In the axial flux motor 1, the rotor 3 is essentially driven by the axially oriented component of the magnetic flux 28 generated by the stator 2 (see [reference]). Figure 5 ).

[0060] exist Figure 6 The diagram shows localized strong eddy currents or eddy current losses in a known circuit board 9 with a connection line 11 having a relatively large width of 20.

[0061] Figure 7 A sectional top view shows the motor 1 with other circuit boards 9. (Reference: For) Figures 1 to 6 The content of the explanation.

[0062] Here, the connecting line 11 is implemented with a smaller width 20 in section 18. Although eddy current losses can therefore be reduced, the resistance of the connecting line 11 in section 18 is now significantly increased.

[0063] Figure 8 The motor 1 with circuit board 9 is shown in a sectional top view. Figure 9 The sectional side view shows the results according to Figure 8 The circuit board 9 of motor 1. Figure 10The first perspective view shows the following based on Figure 8 Motor 1. Figure 11 The second perspective view shows the following based on Figure 8 Motor 1. Figure 12 The perspective view shows the results based on Figure 8 The stator 2 of motor 1. Figure 13 The third perspective view shows the results based on Figure 8 Motor 1. Figure 14 The fourth perspective view shows the results based on Figure 8 Motor 1. Figure 15 The sectional side view shows the results according to Figure 8 Motor 1. The following describes them together. Figures 8 to 15 Reference for Figures 1 to 7 The content of the explanation.

[0064] Motor 1 has a stator 3 and an annular rotor 2 arranged side-by-side along the axial direction 4. The stator 3 has a plurality of stator teeth 6 arranged side-by-side along the circumferential direction 5 and extending respectively along the axial direction 4. A coil 7 with a plurality of windings 8 is arranged at each stator tooth 6. The windings 8 are electrically connected to a circuit board 9, which is arranged at the end side 10 of the stator 2 and beside (or overlapping with) the stator 2 along the axial direction 4. The circuit board 9 includes a plurality of electrical connection lines 11, through which the windings 8 are interconnected and connected to electrical connection points 12, 13 of the electric motor 1. These connection lines 11 are located in the circuit board 9 in a plurality of planes 14, 15, 16 transverse to the axial direction 4 (according to...). Figure 9 For example, it extends in the first plane 14, the second plane 15, and the third plane 16. Each connecting line 11 is associated with an electrical connection portion 12, 13 and is respectively associated with at least one stator tooth 6, and is positioned along the axial direction 4 at least partially aligned with a coil 7 arranged at the corresponding stator tooth 6 (see...). Figures 10 to 15 ).

[0065] The connection line 11 is arranged between two adjacent stator teeth 6 and extends along the radial direction 17 in a section 18 (the magnet 27 of the rotor 3 is arranged aligned with this section along the axial direction 4 during the operation 2 of the motor 1) into multiple sub-lines 19, wherein the sub-lines 19 are arranged electrically insulated from each other in the section 18. Figures 8 to 15 In this configuration, sub-line 19 extends between a first end 29 and a second end 30 along an extension direction 31 that extends transversely to the axial direction 4. Here, connecting line 11 is divided into sub-line 19 throughout its entire extension.

[0066] The stator 2 has stator teeth 6 and coils 7, which extend along the axial direction 4 from the annular base 26 (yoke, stator iron, or stator back plate). The number of coils 7 or stator teeth 6 and the number of magnets 27 of the rotor 3 can be different from each other or correspond to each other.

[0067] Each connecting line 11 is associated with electrical connection portions 12, 13 and at least one stator tooth 6, and is positioned along the axial direction 4 at least partially aligned with a coil 7 arranged at the corresponding stator tooth 6. Thus, each winding 8 of the coil 7 can contact the connecting line 11 associated with that coil 7. The contact is via line 25 (see, for example, see...). Figure 15 The circuit extends at least partially along the axial direction 4 from the winding 8 toward the circuit board 9. In the circuit board 9, the circuit 25 or the contact circuit 23 that connects the connecting circuits 11 to each other extends along the axial direction 4.

[0068] Due to the arrangement of the connecting line 11, which is at least partially aligned with the coil 7, the stator tooth 6 can extend at least into the circuit board 9 or through the circuit board in the axial direction 4. The circuit board 9 has an opening or through portion for the stator tooth 6.

[0069] The section 18 of the connecting line 11 is divided into a plurality of (six in this case) sub-lines 19, wherein the sub-lines 19 are arranged electrically insulated from each other in the section 18 (e.g., by means of the material described above for the circuit board 9).

[0070] Circuit board 9 is arranged along axial direction 4 between stator 2 and rotor 3. It is in this design of motor 1 (which is chosen, for example, due to assembly conditions) that eddy current losses can be significantly reduced by dividing the connecting line 11 into sub-lines 19 in section 18.

[0071] Sub-line 19 has a significantly reduced width 20 extending transversely to the extension direction 31 of sub-line 19 (see example). Figure 8 ).

[0072] Sub-line 19 is electrically connected to other sub-lines 19 of connecting line 11 only outside of section 18 (see example). Figure 12 ).

[0073] The connecting line 11 extends at least partially around the stator tooth 6 from a first connecting portion 21 at one of the connecting portions 12 and 13 to a second connecting portion 22, wherein the connecting line 11 is also divided into sub-lines 19 outside the section 18. Figure 8 and Figures 10 to 15 In the middle, the connecting line 11 is constructed entirely in the form of sub-line 19, wherein, in Figure 12In this circuit, only two ends of the connecting line 11 or the ends 29, 30 of the sub-line 19 are electrically joined together, and thereby connected to a (corresponding) connector 21, 22.

[0074] Each sub-line 19 extends along only one plane 14, 15, 16 in the circuit board 9.

[0075] Multiple windings 8 of coil 7 are electrically connected to connecting line 11 via line 25 extending in the axial direction 4 in circuit board 9, and are at least partially electrically connected to sub-line 19. Sub-line 19 are interconnected within circuit board 9 via contact line 23 extending in the axial direction 4.

[0076] Figure 16 The sectional top view shows the data according to... Figure 4 9 known circuit boards. Figure 17 The first implementation variant is shown in a sectional side view. Figure 16 Circuit board 9. Figure 18 The second implementation variant illustrates the following based on Figure 9 Circuit board 9. Figure 19 The diagram is shown in sectional top view and sectional side view according to... Figure 9 A portion of circuit board 9. The following describes the common features. Figures 16 to 19 Reference for Figures 1 to 15 The content of the explanation.

[0077] In the known circuit board 9, the connecting line 11 is implemented as a surface structure (see...). Figure 16 The surface structure is in the axial direction 4 (see...) Figure 17 It has a smaller extension in the radial direction 17 and a significantly larger extension in the circumferential direction 5.

[0078] The contact line 23 of the proposed circuit board 9 has a line cross-section 24 (in a plane perpendicular to the axial direction 4), which has up to 100% of the line cross-section 24 of the sub-line 19 connected to the corresponding contact line 23.

[0079] Contact line 23 and, if necessary, line 25 may have a circular (e.g., perfectly circular or elliptical) line cross-section 24 (see...). Figures 16 to 18 ).

[0080] exist Figure 19 The diagram shows that the contact line 23 has a non-circular cross-section 24. The contact line 23 has a rectangular cross-section 24 therein. The extension of the cross-section 24 parallel to the direction of the winding 8 and the sub-line 19 is greater than the extension transverse to the direction of the winding and the sub-line (i.e., substantially in the circumferential direction 5).

[0081] List of reference numerals 1. Motor 2. Stator 3 rotors 4. Axial direction 5. Circumferential direction 6 stator teeth 7 coils 8 windings 9 Circuit Boards 10 end side 11. Connecting lines 12 First connecting part 13 Second connecting part 14 First plane 15 Second plane 16 Third plane 17. Radial direction Section 18 19 sub-circuits 20 width 21 First connecting section 22 Second connecting section 23 Contact lines 24. Cross-section of the line Route 25 26 matrix 27 Magnets 28 Magnetic flux 29 First end 30 Second end 31. Direction of extension.

Claims

1. An electric motor (1) having at least a stator (2) and an annular rotor (3) arranged side-by-side along an axial direction (4); wherein, The stator (2) has a plurality of stator teeth (6) arranged side by side along the circumferential direction (5) and extending respectively along the axial direction (4); wherein at least one coil (7) with at least one winding (8) is arranged at each stator tooth (6); wherein the at least one winding (8) is electrically connected to a circuit board (9), wherein the circuit board (9) is arranged at the end side (10) of the stator (2) and along the axial direction (4) next to the stator (2), wherein the circuit board (9) includes a plurality of electrical connection lines (11), wherein the at least one winding (8) of each coil (7) is connected via the connection lines to at least other windings (8) or to the stator. The circuit board (9) is connected to an electrical connection (12, 13); wherein the connection line (11) extends at least partially in at least one plane (14, 15, 16) transverse to the axial direction (4) of the circuit board (9); wherein each connection line (11) is associated with at least one electrical connection (12, 13) and with at least one stator tooth (6); wherein at least one section (18) of at least one connection line (11) is divided into a plurality of sub-lines (19), wherein the sub-lines (19) are arranged electrically insulated from each other in the section (18), wherein the circuit board (9) is arranged between the stator (2) and the rotor (3) along the axial direction (4).

2. The motor (1) according to claim 1, wherein, The rotor (3) has a plurality of magnets (27); wherein the section (18) is arranged at least in the region of the circuit board (9) such that the magnets (27) are arranged to be aligned with the region along the axial direction (4) during operation of the motor (1).

3. The motor (1) according to any one of the preceding claims, wherein, At least one sub-line (19) extends along the extension direction (31) between a first end (29) and a second end (30), wherein the sub-line (19) has a width (20) of up to 1.5 mm extending transverse to the extension direction (31) and transverse to the axial direction (4).

4. The motor (1) according to claim 1 or 2, wherein, Sub-lines that correspond to different connection lines (11) extend at least partially in planes (14, 15, 16) that are different from each other and at least offset from each other in the axial direction (4) of the circuit board (9).

5. The motor (1) according to claim 4, wherein, Connection lines (11) or sub-lines (19) arranged in at least different planes (14, 15, 16) are electrically connected to each other via contact lines (23) extending along the axial direction (4) in the circuit board (9); wherein the contact lines (23) have a line cross-section (24) having at most 100% of the line cross-section (24) of the sub-line (19) connected to the corresponding contact line (23).

6. The motor (1) according to claim 1 or 2, wherein, At least a portion of the sub-line (19) extends in the at least one segment (18) of the connecting line (11) in planes (14, 15, 16) that are different from each other in the circuit board (9) and at least offset from each other in the axial direction (4).

7. The motor (1) according to claim 1 or 2, wherein, The sub-line (19) is electrically connected to other sub-lines (19) of the connecting line (11) only outside the section (18).

8. The motor (1) according to claim 1 or 2, wherein, The connecting line (11) is divided into sub-lines (19) along its entire extension in the circuit board (9).

9. The motor (1) according to claim 1 or 2, wherein, Each sub-line (19) in the circuit board (9) extends along only one plane (14, 15, 16).

10. The motor (1) according to claim 1 or 2, wherein, The at least one connecting line (11) is divided into at least three sub-lines (19) in the section (18).

11. The electric motor (1) according to claim 5, wherein, The contact line (23) has a non-circular line cross-section (24).

12. A circuit board (9) for an electric motor (1), wherein, The motor (1) has at least a stator (2) arranged side-by-side along an axial direction (4) and an annular rotor (3). The stator (2) has a plurality of stator teeth (6) arranged side-by-side along a circumferential direction (5) and extending respectively along the axial direction (4). At least one coil (7) with at least one winding (8) is arranged at each stator tooth (6), and the at least one winding (8) is electrically connected to the circuit board (9). The circuit board (9) includes a plurality of electrical connection lines (11), and the at least one winding (8) of each coil is electrically connected to at least one other winding (8) or to at least one of the motors via the connection lines. The circuit board (9) is connected by a connection (12, 13); wherein the connection line (11) extends at least partially in at least one plane (14, 15, 16) transverse to the axial direction (4) of the circuit board (9); wherein each connection line (11) is associated with an electrical connection (12, 13) and with at least one stator tooth (6); wherein at least one section (18) of at least one connection line (11) is divided into a plurality of sub-lines (19), wherein the sub-lines (19) are arranged electrically insulated from each other in the section (18), wherein the circuit board (9) is arranged between the stator (2) and the rotor (3) along the axial direction (4).

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