Electric machine with electronic circuit board contacting the stator housing

Abstract

Electric machine (10), in particular for adjusting movable parts in a motor vehicle, having a stator housing (22) which receives a stator (12) and a rotor (14), wherein the rotor (14) has a rotor shaft (20) on which a commutator (18) is arranged which can be electrically energized by means of brushes (20), and the stator housing (22) has an axial opening (24) with a surrounding edge (26), through which the rotor shaft (16) projects out of the stator housing (22), wherein an electronic circuit board (PCB) (30) which is equipped with at least one interference suppression element (44) is arranged transversely to the rotor shaft (16), and the electronic circuit board (30) is conductively applied at its peripheral region (31) against the edge (26) in order to establish a grounding contact with the stator housing (22).

Description

Technical Field

[0001] The present invention relates to an electric motor having an electronic circuit board having a contact stator housing of the type described in the independent claims. Background Technology

[0002] A known electric drive unit is described in DE 42 25 496 A1, in which an intermediate frame is arranged between the electrode tank and the transmission housing, and the brush holder is integrated into the intermediate frame. The drive unit is modularly constructed, with individually constructed plugs arranged at different locations on the drive unit. This allows for various variations, such as with or without an electronic housing, and depending on the installation location of the drive unit, the plug connections are matched according to spatial relationships and customer-specific mating plugs. The electronic housing, along with the electronic circuit board housed therein, is always radially arranged outside the electrode housing. A disadvantage of this embodiment is that the electronic circuit board with different electronic components emits electromagnetic interference radiation (EMV), which may interfere with other electronic functions in the KFZ. Furthermore, brush contact in the intermediate frame also causes interference radiation, which is emitted into the surrounding environment through the plastic housing. This disadvantage should be eliminated by the motor according to the invention. Summary of the Invention

[0003] The motor according to the invention, having the features of independent claim 1, has the advantage that the conductor circuit board can simultaneously be used as a shielding cover directly attached to the stator housing made of metal. The electronic components on the circuit board are located within the stator housing, acting like carbon brushes, and the stator housing together with the circuit board forms a Faraday cage that acts as an EMV barrier, shielding against electromagnetic interference radiation. By arranging the conductor circuit board transversely to the rotor shaft, the carbon brushes of the brush frame components can be directly connected to the conductor circuit board via a very short electrical path. This embodiment eliminates the need for additional, costly plate-type shielding. The shielding effect of the conductor circuit board arranged in this way also provides EMV shielding for frequencies up to, for example, 3 GHz.

[0004] Advantageous improvements and enhancements to the embodiments given in the independent claims can be achieved through the measures enumerated in the dependent claims. Preferably, the electronic circuit board is axially abutted against the flange of the stator housing without interruption along its entire periphery, thus achieving a gapless shielding cage at the periphery. The central through-hole in the electronic circuit board for the rotor shaft can, conversely, be shielded simply by means of a shielding member attached to the bearing cover. Thus, EMV radiation from the carbon brushes and electronic components on the printed conductor circuit board is also reliably shielded relative to high frequencies. Thus, for example, the brush holder and / or bearing cover can be fastened and positioned on the conductor circuit board. Thus, the electric motor is constructed to be very compact and has high mechanical stability.

[0005] A particularly cost-effective method for shielding electronic circuit boards is to arrange at least one continuous conductive layer on an insulating substrate of the electronic circuit board, on which no defective areas are formed by constructing switching circuits or connecting electronic components. These continuous conductive layers can be manufactured according to standard procedures during circuit board production, wherein, in particular, two of these planar conductive layers are simultaneously arranged as axially inward layers, and switching circuits and electronic components are constructed on two additional outer conductive layers. Here, at least one planar conductive layer is connected to at least one axial side of the conductive circuit board by means of an axial through-hole contact, and the conductive layer thus axially conductively rests against a flange.

[0006] In the manufacture of electronic circuit boards, a planar, coherent conductive layer can be applied, particularly simply, as a thin metal layer—especially made of copper—to an insulating substrate. In an alternative embodiment, however, the conductive layer can also be constructed as a mesh of fine holes, wherein extremely small holes are left, particularly within the coherent conductive layer. Here, these holes are so small that EMV radiation up to, for example, the desired frequency upper limit of 3 GHz is still adequately shielded.

[0007] To ensure reliable contact between the electronic circuit board and the flange across its entire perimeter, the conductor circuit board has a radially overlapping area with the flange. This overlapping area is electrically conductively constructed on the axial bottom surface of the electronic circuit board facing the flange. This ensures sufficiently low impedance and symmetrical connection of the shielding effect to the stator housing throughout its lifespan. This can be achieved, for example, simply using an additional metal coating, or by removing the uppermost insulating layer, thus axially exposing the outermost conductor layer in the overlapping area.

[0008] Particularly preferably, via contacts are arranged within a radially overlapping area, thereby connecting the electrically conductive overlapping area on the bottom surface to a planar, continuous conductive layer inside the electronic circuit board. To ensure adequate EMV shielding, the spacing between via contacts along the circumferential direction must not be too large. In particular, the maximum spacing between via contacts is 3 mm, thus ensuring reliable shielding even at frequencies up to 3 GHz.

[0009] To shield the central through-hole in the electronic circuit board from EMV, a conductive grounding contact area is constructed around the central through-hole on the top surface of the electronic circuit board facing the bearing cover. This grounding contact area is constructed on a critical peripheral portion and is electrically connected to the rotor bearing, which is made of metal. This electrical connection can be achieved either through additional, conductive adapter elements or directly by constructing an electrically conductive section on the bearing cover.

[0010] Via contacts are preferably also arranged along the grounding contact area, connecting the electrically conductive grounding contact area on the top surface to the planar, continuous conductive conductor layer inside the electronic circuit board. To ensure adequate EMV shielding, the spacing between the via contacts along the circumferential direction is not allowed to be too large. In particular, the maximum spacing between individual via contacts on the grounding contact area is 3 mm, thereby reliably shielding frequencies up to 3 GHz. At least one internal planar conductive conductor layer can be constructed as two parallel, planar conductive conductor layers connected to each other by means of axial via contacts. In particular, the via contacts completely penetrate the electronic circuit board along the axial direction, penetrating both the bottom and top surfaces of the electronic circuit board, wherein the via contacts electrically connect all the conductor layers of the electronic circuit board located between them.

[0011] The stator housing advantageously has a flattened circular cross-section, allowing it to be installed even in limited construction space—for example, in a vehicle side door. The periphery thus has two parallel, opposing flat sections, and two circular sections in between. The periphery of the electronic circuit board is particularly advantageously similar, extending radially over its entire periphery beyond the axial opening of the stator housing to form an overlap area with the flange. This achieves a mechanically stable and electrically reliable flange connection. If the central through-hole in the electronic circuit board is constructed as a rectangle or square, an anti-rotation feature can simultaneously be created between the brush holder and bearing cover, along with the electronic circuit board.

[0012] Electronic circuit boards can be manufactured cost-effectively using surface mount technology (SMD), in which all components to be fitted are soldered on using SMD. Here, for example, at least one anti-interference choke coil or varistor, or capacitor, or thermostat, or Hall sensor is soldered to the bottom and / or top surface using SMD technology. Similarly advantageously, the contact elements for carbon brushes are also constructed as SMD parts. With this SMD technology, the entire motor can be used up to temperatures exceeding 170°C, and the electronic components are constructed with SMD-mount technology to be particularly vibration-resistant.

[0013] For energizing the motor, quiver brushes or hammer brushes can be used. The brushes are arranged on separately manufactured brush frames, which are secured to the bottom of the electronic circuit board—and particularly axially and completely within the stator housing. For electrical contact with the brushes, these brushes are connected to contact elements of the electronic circuit board, for example by means of flexible stranded wires, particularly by soldering. The brush frames are preferably constructed of plastic so that the quiver for the brushes can be formed in one piece on the brush holder. For assembly, the brush frames can first be electrically and mechanically connected to the electronic circuit board, and then axially inserted into the stator housing until the electronic circuit board is axially abutting against the flange. Thus, the brush frames shield against EMV radiation by means of the electronic circuit board.

[0014] The electronic circuit board can be easily axially fastened between the flanges of the stator housing and the mating flanges of the drive housing in an axial assembly method. The drive housing can be made of plastic. For example, the two housing parts are connected to each other by tightening, crimping, or other material deformation. The radial edges of the electronic circuit board that are not surrounded by the housing between the housing parts can be sleeved, for example, with a protective layer that prevents liquid from penetrating into the electronic circuit board.

[0015] A bearing cap, having a bearing housing for a rotor bearing, is fastened to the top surface of the electronic circuit board, positioned axially opposite to the brush frame components. The rotor bearing is constructed as a cylindrical or ball bearing, particularly metallic. The bearing cap can also be made of plastic; however, it has an electrically conductive area around the bearing housing that connects the rotor bearing to the ground contact area of ​​the electronic circuit board. For this purpose, the bearing cap can have a conductive coating, or a separately made electrically conductive adapter element that is axially tensioned towards both the rotor bearing and the ground contact area. For example, the ground contact area and the adapter element are configured at approximately four corners, wherein the adapter element—or alternatively, the bearing cap itself—preferably conductively abuts against the top surface of the electronic circuit board over the entire periphery of the central through-hole.

[0016] The brush holder component, radially opposite to the peripheral wall of the stator housing, particularly preferably has a surrounding axial wall. A centering element is formed on this wall, which correctly positions the brush holder—and consequently the carbon brush—relative to the commutator. The brush holder is axially connected to a bearing cap, which is axially arranged on the opposite top surface of the electronic circuit board. For this purpose, connecting elements are fitted through a central through-hole to ensure that at least one planar conductive layer is not interrupted. For example, stop elements and / or clamping elements can be formed on the brush holder and / or bearing cap, which cooperate with the mating stop elements and / or clamping elements of the bearing cap and / or brush holder. Thus, the brush holder and bearing cap, with the electronic circuit board located therebetween, are constructed as a pre-assembled sandwich member. This sandwich member is centered relative to the stator housing by means of the brush holder and relative to the transmission housing by means of the outer contour of the bearing receiving portion of the bearing cap. The electronic circuit board is positioned by a central through-hole in the sandwich member.

[0017] By radially arranging separately manufactured connectors outside the pole housing, the insertion direction and orientation of the corresponding customer-specific mating connectors can be easily adapted to the positional relationship of the installation space without altering the basic design of the brush holder tray, bearing cover, or electronic circuit board. By constructing a motor assembly with consistently unchanged brush holder components, variations in electronic functions, such as rotor orientation detection or electronic anti-interference, can be transferred only to the more easily modified electronic circuit board. The unchanging stator housing interface ensures that the brushes are reliably and well positioned relative to the commutator while the motor remains adaptable to the most diverse customer requirements. This also allows for a consistently unchanged stator housing-electronic circuit board-drive housing interface, ensuring that the flanges of both the stator housing and drive housing are always reliably sealed, even with variations in the electronic circuit board and / or connectors.

[0018] By constructing an electronic circuit board with a radial platform that extends radially beyond the flange to a separately manufactured connector in the peripheral region, the need for separately manufactured connecting elements to connect the electronic circuit board to the connector can be eliminated. Here, not only the current supply connector pins but also the pins for the Hall sensor are directly soldered to the platform of the conductor circuit board. Expensive current-carrying sections for individual conductor elements in the electronic circuit board are unnecessary. Furthermore, the electronic circuit board rests extensively against the flange of the stator housing in the peripheral region of the platform, providing more space for arranging electronic components near the connector. Attached Figure Description

[0019] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. Wherein: Figure 1 A general view of the motor according to the first embodiment is shown; and Figure 2 and Figure 3 Another embodiment of the electronic circuit board for the motor is shown from below and from above; Figure 4 and Figure 5 The following diagrams show the installation of the sandwich panel members, shown from below and above. Figure 2 and Figure 3 Examples; Figure 6 Another embodiment of a conductor circuit board mounted on a stator housing is shown; Figure 7 Another embodiment of the construction of a conductor circuit board is shown; and Figure 8 Another embodiment of the electronic circuit board is shown. Detailed Implementation

[0020] Figure 1An electric motor 10 is shown, which is incorporated in a motor vehicle for example for adjusting movable parts—preferably windows, a movable roof, or seat components. Here, a stator 12 is arranged in a stator housing 22, within which a rotor 14 is arranged, its rotor shaft 16 extending axially from the stator housing 22 into an axially connected transmission housing 60. The stator 14 preferably has a permanent magnet 13 that drives the electrical windings 15 of the rotor 14. Here, driving torque is transmitted from the rotor shaft 16 to a transmission mechanism arranged in the transmission housing 60. A driven element 17—particularly a worm gear—is arranged on the rotor shaft 16, which cooperates with other transmission components. Thus, by means of a mechanical process not shown, components such as vehicle seat parts or windows in a motor vehicle are adjusted. A brush holder tray 55 is arranged axially between the pole housing 22 and the transmission housing 60, receiving brushes 20 for electrical contact with a commutator 18 arranged on the rotor shaft 16. Here, the brush 20 can be configured as a hammer brush or preferably a quiver brush 28. The brush holder tray 55 is made of plastic, for example, and is preferably arranged radially and completely within the stator housing 22. Axially adjacent to the brush holder tray 55, an electronic circuit board 30 (PCB = Printed Circuit Board) is arranged transversely to the rotor shaft 16. The electronic circuit board 30 has a central through-hole 32 through which the rotor shaft 16 extends. The electronic circuit board 30 is electrically conductively attached to the stator housing 22 at its radially outer periphery. For example, a flange 28 is constructed on the edge 26 of the axial opening 24 of the stator housing 22, and the electronic circuit board 30 is attached to the flange in the axial direction 8. The electronic circuit board 30 has at least one planar conductive layer 36, which serves as a shielding cover for EMV rays from the motor 10. Anti-interference elements and contact elements 50 for the brush 20 are arranged on the electronic circuit board 30 as electronic components 44. Additionally, the electronic circuit board 30 is connected to a connector 64 for supplying current to the motor 10, which is radially arranged outside the stator housing 22. Opposite to the brush holder tray 55, a bearing cover 56 is arranged on another axial side of the electronic circuit board 30. This bearing cover has a bearing receiving portion 57 for a bearing member 58 for the rotor shaft 16. The bearing member 58 is constructed, for example, as a cylindrical bearing or a spherical bearing made of metal. Here, the bearing member 58 is electrically conductively connected to the planar conductive conductor layer 36 of the electronic circuit board 30. The bearing cover 56 is preferably axially connected to the brush holder tray 55 by means of a clamping element or a locking element 98, such that the electronic circuit board 30 is constructed as a sandwich member 70 between the brush holder tray 55 and the bearing cover 56. Here, the radial extension 7 of the electronic circuit board 30 is preferably greater than the extensions of the brush holder tray 55 and the bearing cover 56.For example, the transmission housing 60 is connected to the stator housing 22 by means of a connecting element 66, thereby the electronic circuit board 30 is firmly fixed between the stator housing 22 and the transmission housing 60.

[0021] exist Figure 2 Another embodiment of the bottom surface 41 of the electronic circuit board 30 is presented, which is axially oriented towards the stator 12. The electronic circuit board 30, like the stator housing 22, has a flattened circular cross-section, such that the outer periphery 31 of the electronic circuit board 30 has a circular segmental section 72 and two parallel, opposing sections 73. The central through-hole 32 for the rotor shaft 16 is configured here with an approximately four-cornered periphery 33, such that the central through-hole forms an anti-rotation portion against the sandwich member 70. At least two contact elements 50 for the brushes 20 are arranged on the bottom surface 41, for example, diagonally opposite each other. On the electronic circuit board 30, at least one anti-interference current-blocking coil 45 and / or varistor 46, and / or capacitor 47 and / or thermostatic switch 48 are arranged as electronic structural elements 44. All these structural elements 44 are arranged on a region of the electronic circuit board 30, which is radially arranged within the opening 24. At the radial outer periphery 31, an electrically conductive overlapping region 40 is constructed around the bottom surface 41, conductively abutting the stator housing 22. This overlapping region is conductively attached to the flange 28. The conductive overlapping region 40 is constructed on an insulating substrate 34 by a metallic coating, or particularly by removing the outermost insulating layer of the electronic circuit board 30. This outer overlapping region 40 is electrically connected to a planar conductive layer 36 disposed within the electronic circuit board 30. In this embodiment, a plurality of individual via contacts 38 are configured to be distributed on the outer periphery, connecting the overlapping region 40 to other conductive layers 35 of the electronic circuit board 30. Here, the spacing 39 between the via contacts 39 is a maximum of 3 mm to provide sufficient EMV shielding. A connector 64 is radially arranged beside the electronic circuit board 30, here configured as a component separately manufactured from the electronic circuit board 30. The connector 64 is connected to the electronic circuit board 30 via a conductor element 65, one end of which forms a connection pin 63 for current supply. Opposite ends of the conductor element 65 are led from the top surface 42 through the electronic circuit board 30 to the bottom surface 41 of the electronic circuit board via current leads 67. On the bottom surface 42, the conductor element 65 is connected to contact elements 50 for the brush 20 via anti-interference chokes 45. The connector 64 has a plug flange 74 within which the connection pins 63 for electrical contact with the motor 10 are arranged. Figure 1In this embodiment, the plug sleeve 74, together with the connecting pin 63, extends in the axial direction 8, so that the corresponding plug can also be pushed into the plug sleeve 74 in the axial direction 8. The construction element 44 and the contact element 50 for the brush 20 are all constructed as SMD components, so that the electronic circuit board can be fully equipped by means of a single surface mount device (SMD) - soldering process.

[0022] exist Figure 3 The electronic circuit board 30 has a top surface 42 axially opposite the bottom surface 41, which faces the transmission housing 60. On the top surface 42, an electrically conductive ground contact area 80 is arranged on the periphery 31 surrounding the central through-hole 32. This ground contact area is connected to the bearing member 58 during assembly. The ground contact area 80—like the overlapping area 40 on the bottom surface 41—is also constructed on an insulating substrate 34 by, for example, a metallic coating. The ground contact area 80 is also electrically connected to other conductor layers 35—and particularly to internal conductor layers 36 configured for planar conduction—by means of individual through-hole contacts (VIAS) 38 distributed on the periphery of the central through-hole 32. The individual through-hole contacts (VIAS) 38 on the overlapping area 40 and the ground contact area 80 are configured to extend axially through the entire electronic circuit board 30, such that they extend from the bottom 41 to the top 42, respectively. The conductor element 65, used for connecting the connector 64, is connected from the top surface 42 to the electronic circuit board 30 as a current lead 67 for supplying current to the brush 20. To ensure EMV shielding of the current lead 67 in the area passing through the electronic circuit board 30, four Cy-capacitors 69 are arranged around the current lead 67 on the top surface 42, these capacitors being star-shaped away from the current lead 67. The Cy-capacitors 69 are electrically connected to a planar conductive layer 36, which also makes electrical contact with the stator housing 22 and the bearing member 58. Attached to the conductor element 65, a signal wire 105 is also led from the connector 64 to the top surface 42 of the electronic circuit board 30, where it connects to the magnetic sensor 49. For this purpose, the end of the signal wire 105 contacts a contact pad 108 on the top surface 42, which is part of the connection assembly 89 for the magnetic sensor 49.

[0023] exist Figure 4 An embodiment of the sandwich member 70 is presented, wherein when viewed according to Figure 2A brush holder tray 55 and a bearing cover 56 are mounted in the view of the bottom surface 41. A quiver 54 is formed on the brush holder tray 55 to receive the brushes 20. Each brush 20 has a stranded wire 52 that is electrically connected—for example, welded—to a contact element 50 for the brush 20. The contact element 50 is configured as a tab protruding axially from the electronic circuit board 30, which axially engages through a corresponding hole in the brush holder tray 55. To radially compress the brushes 20, a compression spring 53 is arranged on the brush holder tray 55, which rests against the side of the brush 20 away from the commutator 18 using a spring arm. A thermostatic switch 48 is axially engaged through a gap in the brush holder tray 55 and extends to the rotor 14. The brush holder tray 55 has a surrounding wall 95 at its outer periphery that extends in the axial direction 8. A positioning element 96 is formed on the wall, by means of which the brush holder tray 55 is centered in the stator housing 22. The brush holder tray 55 is then axially and fully inserted into the stator housing 22. The overlapping area 40 of the electronic circuit board 30 extends radially beyond the brush holder tray 55, such that the overlapping area 40 is electrically contacted against the flange 28 of the stator housing 22 when the interlayer member 70 is inserted. The bearing member 58, which is received in the bearing cover 56, is clearly visible through the central through-hole 94 in the brush holder tray 55. For the grounding connection of the bearing member 58, an electrically conductive adapter element 82 is axially sandwiched between the bearing member 58 and the grounding contact area 80 of the electronic circuit board 30.

[0024] Figure 5 The image shows the top surface 42 of the electronic circuit board 30. Figure 4 The electronic circuit board has a sandwich member 70, through which a bearing cover 56 is mounted. A bearing member 58 is inserted into a bearing receiving portion 57 of the bearing cover 56. The bearing cover 56 also has a central through-hole 93 through which the rotor shaft 16 extends into the transmission housing 60. On the back side of the bearing receiving portion 57, radial beams 59 are constructed on the bearing cover 56, which optionally also affect the alignment of the bearing cover 56 in the transmission housing 60. The bearing cover 56 also has a surrounding wall 92 with radial through-holes 91 for conductor elements 65. The electronic circuit board 30 also extends radially beyond the bearing cover 56 on its top surface 42. At this radial extension, the transmission housing 60 axially abuts against the electronic circuit board 30 to axially and conductively press the electronic circuit board toward the flange 28. Furthermore, wall 92 has radial protrusions 90 that are configured to cover radial openings in the transmission housing 60 when the interlayer member 70 is installed by twisting 180 degrees to position the connecting plug 64 on opposite sides. Simultaneously, these radial protrusions 90, together with corresponding openings on the transmission housing 60, also form anti-rotation portions.

[0025] exist Figure 6The diagram schematically illustrates how the brush holder tray 55, along with the electronic circuit board 30, is placed into the stator housing 60. The overlapping area 40 of the bottom surface 41 electrically abuts against the flange 28. On the top surface 42, the adapter element 82 axially abuts against the ground contact area 80 surrounding the central through-hole 32. The diagram also schematically shows a bearing member 58 without a bearing cap 56, which again axially and conductively abuts against the adapter element 82. Thus, not only the bearing member 58 but also the stator housing 22 is planar electrically connected to the planar conductive conductor layer 36 of the electronic circuit board 30. Here, the adapter element 82 has an electrically conductive material—for example, metal—to shield the central through-hole 32 of the electronic circuit board 30 in terms of EMV. In this embodiment, a tightening eye 68 is formed in the flange 28, through which a screw 62, preferably a connecting element 66, is inserted into the transmission housing 60. The connector 65 is connected to the stator housing 22 and the transmission housing 60, for example, by means of a connector 110, in which the conductor element 65 and the signal wire 105 are guided.

[0026] In another, unpresented variation, a sliding contact relative to the rotor shaft is constructed in the bearing member 58 and / or on the adapter element 82 to improve the ground contact of the stator housing 22 relative to the rotor shaft 16. Here, a springy tongue or spring wire or electrically conductive nonwoven or woven fabric is radially and slidably pressed relative to the rotor shaft.

[0027] Figure 7An embodiment of an electronic circuit board 30 is shown, which has a total of four conductor layers 35. Electronic structural elements 44 and electronic switching circuits are arranged on the two outer conductor layers 35. A Hall sensor 49 and its electronic conductor circuit 51 are thus constructed on the top surface 42 presented on the left. In addition, conductor elements 65 are electrically conductively secured to the electronic circuit board 30 by means of current leads 67. A shielding Cy-capacitor 69 is electrically contacted on the top surface 42. The two axially inner conductor layers 35 are here constructed as planar conductive conductor layers 36, which are used for EMV shielding. This means that the planar conductive conductor layers 36 do not have switching circuits or additional gaps. The two planar conductive conductor layers 36 also have a central through-hole 32 for the rotor shaft 16. Through-hole contacts 38 conductively penetrate all conductor layers 35 in the overlapping region 40 and in the ground contact region 82. From the top surface 42, the conductor element 65 contacts the electronic circuit board 30 via current leads 67, which are shielded from interference rays by means of Cy capacitors 69. The planar conductive layer 36 is preferably formed of a continuous metal layer, but can also be constructed as a finely meshed metal mesh, wherein the aperture size of the metal mesh is adapted to the shielded EMV frequency. On the bottom surface 41, wiring for electronic components 44 is constructed on the outer conductor layer 35, extending to the brush holder tray 55. Thus, receiving positions for SMD components for the anti-interference choke coil 45, varistor 46, capacitor 47, thermostat 48, and contact elements 50 for the brush 20 are preferably constructed on the bottom surface 41. Insulating layers are arranged between the individual conductor layers 35, which together form the electronic circuit board 30.

[0028] exist Figure 8The top surface 42 of another embodiment of the electronic circuit board 30 is shown, having a radial platform 113 that extends radially beyond the flange 28 of the stator housing 22. On the top surface 42, a conductive ground contact region 80 is constructed on the periphery 31 surrounding the central through-hole 32, which is interrupted at one point by a Hall sensor 49. Through-hole contacts 38 are distributed along the radial outer edge of the electronic circuit board 30. On the peripheral region 112 where a separately constructed connector 64 is arranged, the platform 113 of the electronic circuit board 30 extends beyond the connector 64. On the bottom surface 41, an electrically conductive overlapping region 40 is constructed in the peripheral region 112, extending here particularly along the entire radial dimension of the flange 28, and electrically connected via the through-hole contacts 38 to at least one planar conductive conductor layer 36. At least two regions 101, 102 with different potentials are constructed on the platform 113, each directly connected to a corresponding connecting pin 63 for the current supply to the electric motor 10. The connecting pin 63 is soldered directly into the through-hole 115 of the electronic circuit board 30, for example—preferably, the additional pin 116 for the Hall sensor 49 is also soldered in. The connecting pin 63 and the additional pin 116 extend axially into the plug flange 74 of the connecting plug 64. The two current supply regions 101, 102 are respectively connected to the additional conductor layer 35 by means of Cy-capacitor 69. Through-hole contacts 38 are also constructed between the two regions 101, 102. The radial extension of the platform 113 provides more construction space for the electronic components 44, such that, for example, a varistor 46 and a capacitor 47 are arranged between the two regions 101, 102 on the top surface 42 of the platform 113. In addition, a test pad 120 is constructed on regions 102, 102, by means of which the operational capability of the electronic circuit board 30 in the installed state can be checked. In this embodiment, the unpresented bearing cap 56 has a radial protrusion that radially covers the platform 113 and connects to the coupling plug 64—particularly as a stop. In this embodiment, separately constructed conductor elements 65 and signal wires 105 for connection to the coupling plug 64 can be omitted.

[0029] It should be noted that the specific shapes of the stator housing 22, transmission housing 60, and connector 64 shown in the accompanying drawings can be adapted to the corresponding application of the motor 10. For example, the electronic circuit board 30 can also receive different electronic components 44 depending on the requirements. Here, the magnetic sensor 49 can be directly arranged on the central through-hole 32 to cooperate with the encoder magnet on the rotor shaft 16. Similarly, the geometry and construction of the printed electronic circuit board 30 can be changed, and for example, it can be configured to have fewer or more than four conductor layers 35, wherein at least one planar conductive conductor layer 36 is arranged in the electronic circuit board 30. The central through-hole 32 can also have a cross-section other than a quadrilateral shape. The electrical contact of the overlapping area 40 and / or the ground contact area 80 can be achieved, for example, by means of a metallic coating of the electronic circuit board 30 or by means of removing a conductor layer 35 of the electronic circuit board 30. The outer periphery of the electronic circuit board 30 can also have a true circle or an arbitrary outer contour instead of a flattened circle.

Claims

1. An electric motor (10) having a stator housing (22) for receiving a stator (12) and a rotor (14), wherein, The rotor (14) has a rotor shaft (16) on which a commutator (18) energized by means of brushes (20) is arranged, and the stator housing (22) has an axial opening (24) with a surrounding edge (26) through which the rotor shaft (16) extends out of the stator housing (22), wherein an electronic circuit board (PCB) (30) equipped with at least one anti-interference element (44) is arranged transversely to the rotor shaft (16), and the electronic circuit board (30) is conductively attached to the edge (26) at its peripheral region (31) to form a ground contact with the stator housing (22), wherein the electronic circuit board (30) has a plurality of spaced conductor layers (35) in an axial direction (8) in an insulating substrate, wherein at least one conductor layer is constructed as a conductor layer (36) made of conductive material without switching circuits on its entire surface, and the conductor layers (35, 36) are electrically connected to each other by means of a plurality of axial through-hole contacts (38).

2. The motor (10) according to claim 1, characterized in that, The motor (10) is configured to adjust the movable parts in the motor vehicle.

3. The motor (10) according to claim 1, characterized in that, The electronic circuit board (30) is conductively axially attached to the flange (28) over the entire periphery (31) of the flange, which is constructed at the edge (26), and the electronic circuit board (30) completely covers the opening (24) of the stator housing (22) except for the central through-hole (32) in the electronic circuit board (30) for the rotor shaft (16).

4. The motor (10) according to claim 3, characterized in that, The electronic circuit board (30) has four spaced conductor layers (35) in an axial direction (8) in an insulating substrate, two of which are constructed as conductor layers (36) made of conductive material without switching circuits on their entire surface, and the conductor layers (35, 36) are electrically connected to each other by means of a plurality of axial through-hole contacts (38).

5. The motor (10) according to any one of claims 1 to 3, characterized in that, At least one conductive layer (36) constructed of conductive material on its entire surface is constructed as a continuous, uninterrupted metal layer or as a fine mesh metal grid.

6. The motor (10) according to claim 3, characterized in that, At least one bottom surface (41) of the electronic circuit board (30) facing the flange (28) in the axial direction is configured to be electrically conductive in the radial overlap region (40) with the flange (28), and the through-hole contact portion (38) between the conductor layers (35, 36) is arranged in the radial overlap region (40) at the periphery of the conductor layer.

7. The motor (10) according to claim 6, characterized in that, At least one bottom surface (41) of the electronic circuit board (30) facing the flange (28) in the axial direction is configured to be non-insulated in the radial overlap area (40) with the flange (28).

8. The motor (10) according to claim 6, characterized in that, The through-hole contact portion (38) has a maximum spacing (39) of 2-3 mm relative to each other along the peripheral direction (9).

9. The motor (10) according to claim 6, characterized in that, A separately manufactured bearing cover (56) is arranged on the top surface (42) of the electronic circuit board (30) opposite to the flange (28), in which the bearing member (58) of the rotor shaft (16) is received.

10. The motor (10) according to claim 9, characterized in that, The bearing component (58) is connected to the electronic circuit board (30) by means of an electrically conductive adapter (82).

11. The motor (10) according to claim 10, characterized in that, At the periphery of the central through-hole (32), the top surface (42) of the electronic circuit board (30) is configured as a ground contact area (80) to be electrically conductive so as to electrically contact the bearing member (58) or the ground sliding contact (77) of the rotor shaft (16) constructed at the adapter (82) via the adapter element (82).

12. The motor (10) according to claim 4, characterized in that, Similarly, electrical through-hole contacts (38) are arranged between the conductor layers (35, 36) at the periphery of the central through-hole (32).

13. The motor (10) according to claim 12, characterized in that, The through-hole contact portion (38) has a maximum spacing (39) of 2-3 mm relative to each other along the peripheral direction (9).

14. The motor (10) according to any one of claims 1 to 3, characterized in that, The electronic circuit board (30) has circular segments (72) and straight segments (73) that are parallel to each other.

15. The motor (10) according to claim 14, characterized in that, The axial opening (24) of the stator housing (22) has a circular section (72) and straight sections (73) that are parallel to each other.

16. The motor (10) according to claim 3, characterized in that, The central through-hole (32) has an approximately square cross-section.

17. The motor (10) according to claim 9, characterized in that, All electronic components (44) on the electronic circuit board (30), including at least one anti-interference choke (45), or varistor (46), or capacitor (47), or thermostat (48), or Hall sensor (49), are contacted on the bottom surface (41) and / or the top surface (42) by means of SMD technology.

18. The motor (10) according to claim 17, characterized in that, The contact element (50) for the brush (20) is secured by means of SMD technology.

19. The motor (10) according to claim 10, characterized in that, A contact element (50) for energizing the brush (20) is arranged on the bottom surface (41) facing the flange (28), wherein the contact element (50) is connected to the brush (20) of the separately made brush holder tray (55).

20. The motor (10) according to claim 19, characterized in that, The contact element (50) is connected to the brush (20) of the separately made brush holder tray (55) by means of stranded wire (52).

21. The motor (10) according to any one of claims 1 to 3, characterized in that, Axially opposite the stator housing (22), the transmission housing (60) is attached to the electronic circuit board (30) by means of a mating flange (61).

22. The motor (10) according to claim 21, characterized in that, The transmission housing (60) is screwed onto the stator housing (22).

23. The motor (10) according to claim 3, characterized in that, The electronic circuit board (30) is connected to a separately made connector (64) by means of a conductor element (65), the connector being arranged radially outside the stator housing (22).

24. The motor (10) according to claim 23, characterized in that, The electronic circuit board (30) has a radial platform (113) that extends radially beyond the flange (28) at a peripheral region (112) to a separately manufactured connector (64), and the connector pins (63) of the connector (64) are directly welded into the platform (113) of the electronic circuit board (30).

25. The motor (10) according to claim 19, characterized in that, A radial positioning element (96) is constructed at the radial periphery profile (95) of the brush holder tray (55), the positioning element positioning the brush (20) relative to the commutator (18).

26. The motor (10) according to claim 25, characterized in that, The brush holder tray (55) is connected to the bearing cover (56) via the adapter element (82) through the central through-hole (32) of the electronic circuit board (30) by means of a clamping or locking element (98).

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