Sensor devices for detecting the rotational position of the rotor of electric machines, drives, and pressure generators for brake equipment

Abstract

[Solution] The present invention relates to a sensor device (17) for detecting the rotational position of a rotor of an electric machine, comprising at least one sensor element (27) and at least one electronic component (30) electrically connected to the sensor element (27), the sensor element (27) and the electronic component (30) being arranged on a common circuit board (18) of the sensor device (17). It is intended that the circuit board (18) comprises at least a first rigid substrate portion (19), a second rigid substrate portion (20) and a flexible substrate portion (21), the second rigid substrate portion (20) being coupled to the first rigid substrate portion (19) by the flexible substrate portion (21), the sensor element (27) being arranged on the first rigid substrate portion (19) and the electronic component (30) being arranged on the second rigid substrate portion (20).

Description

[Technical Field]

[0001] The present invention relates to a sensor device for detecting the rotational position of a rotor of an electric machine, comprising at least one sensor element and at least one electronic component electrically connected to the sensor element, the sensor element and the electronic component being arranged on a common circuit board of the sensor device.

[0002] Furthermore, the invention relates to a drive device having a sensor device of this kind.

[0003] The invention further relates to a pressure generator for a brake installation. [Background technology]

[0004] Drives and sensor devices of the aforementioned type are known from the prior art. In drives with an electric machine, the electric machine is typically arranged in a drive housing. The machine typically includes a rotatably supported rotor and a stator fixed to the housing, which includes motor windings. The motor windings are distributed around the rotor so that the rotor can rotate when a suitable current is applied to the motor windings. Typically, the motor windings are multi-phase, e.g., three-phase. It is known to detect the rotational position of the rotor using a sensor device that includes at least one sensor element and at least one electronic component electrically connected to the sensor element. The sensor element and the electronic component are often arranged on a common circuit board of the sensor device. The sensor device is, for example, an inductive sensor, in which case the sensor element includes at least one receiving coil arranged on the circuit board. The electronic component is preferably an application-specific integrated circuit (ASIC). Summary of the Invention

[0005] The drive device according to the present invention, according to the features of claim 1, is characterized in that the circuit board has at least one first rigid substrate portion, a second rigid substrate portion, and a flexible substrate portion, the second rigid substrate portion being connected to the first rigid substrate portion by the flexible substrate portion, the sensor element being arranged on the first rigid substrate portion, and the electronic component being arranged on the second rigid substrate portion. Because the first and second rigid substrate portions are connected to each other by the flexible substrate portion, the mutual alignment of the first and second rigid substrate portions can be changed by deformation of the flexible substrate portion. That is, the second rigid substrate portion is pivotally supported to the first rigid substrate portion by the flexible substrate portion. This provides advantages in terms of integrating the circuit board or the sensor device into a housing in which the electric machine is arranged. Specifically, compared to a totally rigid circuit board on which both the sensor element and the electronic component are arranged, the two-dimensional construction space is expanded in a third dimension. Compared to a sensor device having multiple circuit boards electrically connected to each other by cables, the solution according to the present invention offers the advantage of reducing the number of components and therefore manufacturing costs. Circuit boards having at least one rigid substrate portion and at least one flexible substrate portion are basically known from the prior art and are also called rigid-flexible circuit boards. Rigid-flexible circuit boards can be manufactured, for example, by removing the material that causes the rigid form of the circuit board, such as FR4, from one area of ​​an entirely rigid circuit board and then covering the remaining strip conductors in this area with a laminate to obtain a flexible substrate portion. The sensor element is preferably electrically connected to the electronic component by at least one strip conductor extending through the first rigid substrate portion, the second rigid substrate portion, and the flexible substrate portion. Accordingly, the first rigid substrate portion, the second rigid substrate portion, and the flexible substrate portion are fixedly connected to each other, at least in the sense that these substrate portions cannot be separated from each other without damaging the strip conductor.

[0006] In a preferred embodiment, the first rigid substrate portion is intended to be configured in the shape of an annular disk, which allows for space-saving integration of the first substrate portion and / or the sensor device into the housing. The flexible substrate portion is preferably arranged on the radially outer edge of the annular disk shape of the first rigid substrate portion, which is also preferred for space-saving integration of the circuit board into the housing. The second rigid substrate portion is preferably configured in the shape of a rectangle.

[0007] In a preferred embodiment, it is contemplated that the sensor element and the electronic component are disposed on different end faces of the circuit board, which also provides advantages with regard to the integration of the circuit board and / or the sensor device into the housing, as will be further explained below.

[0008] In a preferred embodiment, the circuit board has a third rigid substrate portion and another flexible substrate portion, the third rigid substrate portion being connected to the second rigid substrate portion by the other flexible substrate portion, and a connection device for electrically connecting the sensor device to the control device being arranged on the third rigid substrate portion. That is, the third rigid substrate portion is connected to the first rigid substrate portion by the other flexible substrate portion, the second rigid substrate portion, and the other flexible substrate portion, in that order. The provision of the third rigid substrate portion and the arrangement of the connection device on the third rigid substrate portion further enhances flexibility in integrating the circuit board or the sensor device into the housing. Furthermore, forces acting on the connection device are buffered by the other flexible substrate portion rather than being transmitted directly to the second rigid substrate portion. Preferably, the electronic component is electrically connected to the connection device by at least one strip conductor extending through the second rigid substrate portion, the third rigid substrate portion, and the other flexible substrate portion. Accordingly, the second rigid substrate portion, the third rigid substrate portion, and the further flexible substrate portion are fixedly coupled to one another, at least in the sense that these substrate portions cannot be separated from one another without damaging the strip conductors. In an alternative embodiment, the further flexible substrate portion and the third rigid substrate portion are preferably omitted. In this embodiment, the connecting device is preferably arranged on the second rigid substrate portion.

[0009] In a preferred embodiment, the connection device has at least one conductive connector having a first contact area and a second contact area, the first contact area being press-fit into a press-fit opening in the third rigid substrate part, and the second contact area being electrically connected or connectable to the control device. That is, the first contact area is configured as a press-fit area. The first contact area being press-fit into the press-fit opening in the third rigid substrate part provides a mechanically robust electrical connection between the circuit board and the connector on the circuit board side. The second contact area is preferably configured as a plug-in area. In this case, a mechanically robust connection with the control device can be established in a simple manner, by plugging the second contact area configured as a plug-in area into a plug receptacle on the control device side. The connector is preferably configured as a stamped contact element. The connection device preferably has a plurality of conductive connectors.

[0010] The connector is preferably bent, i.e., has a first leg and a second leg bent and aligned with the first leg. The first leg preferably has a first contact area and the second leg preferably has a second contact area. The connector is preferably bent by 80° to 100°, particularly preferably by about 90°.

[0011] The drive according to the invention comprises an electric machine arranged in a housing with a rotatably mounted rotor, and a sensor device arranged fixedly in the housing for detecting the rotational position of the rotor. The drive is characterized by the inventive configuration of the sensor device as defined in claim 7. The advantages already mentioned are also obtained therefrom. Other preferred configurations and combinations of configurations are apparent from the above description and from the claims. The rotor is preferably arranged non-rotatably on a drive shaft rotatably mounted in the housing. At least a circuit board of the sensor device is preferably arranged in the housing.

[0012] In a preferred embodiment, the drive device has an end shield, and the circuit board of the sensor device is intended to be attached to the end shield. The end shield is a housing cover of a housing that encloses the electric machine. Typically, the drive shaft of the drive device is rotatably supported by the end shield. For this purpose, the end shield preferably carries a rotary bearing that acts between the drive shaft and the end shield. Mounting the circuit board on the end shield, on the one hand, allows for a mechanically robust mounting of the circuit board. Furthermore, it allows for a space-saving integration of the circuit board into the housing. For this purpose, it is particularly preferred that the first rigid board portion be configured in the shape of an annular disk and be arranged coaxially with the drive shaft.

[0013] In a preferred embodiment, the end shield is made of a metal material, and the circuit board is attached to the end shield by a support member made of plastic. That is, the circuit board is attached to the end shield by the support member. For example, the circuit board is attached to the support member by a first adhesive bond, and the support member is attached to the end shield by a second adhesive bond. If the end shield is made of a metal material, the end shield is particularly mechanically robust. The support member spaces the sensor element from the metal end shield and electrically insulates the current-carrying wiring or strip conductors of the circuit board from the metal end shield. Preferably, at least the first rigid board portion is attached directly to the support member.

[0014] In an alternative embodiment, the end shield is preferably made of plastic and the circuit board is intended to be directly attached to the end shield. This allows a reduction in the number of components compared to the above-described embodiment. In particular, a support member for carrying the circuit board is omitted. The circuit board is preferably directly connected to the end shield by adhesive bonding. That is, there is an adhesive layer in direct contact with one end shield and the other circuit board. The circuit board is preferably directly connected to the end shield by at least one attachment means. That is, there is at least one attachment means in direct contact with both the end shield and the circuit board. The circuit board is preferably directly attached to the end shield by a locking connection. For example, the circuit board engages with a retaining projection on the end shield. Preferably, at least a first rigid board portion is directly attached to the end shield.

[0015] In a preferred embodiment, the first rigid substrate portion is aligned perpendicular to the rotor's rotational axis, and the second rigid substrate portion is aligned parallel to the rotor's rotational axis. That is, the first and second rigid substrate portions are aligned perpendicular to each other. This alignment of the first and second rigid substrate portions reduces the radial design space required by the circuit board. As described above, the sensor element and the electronic component are preferably arranged on different end faces of the circuit board. This allows the sensor element to face the rotor, while the electronic component is arranged radially inside the second rigid substrate portion, if the first and second rigid substrate portions are aligned perpendicular to each other. This allows the electronic component to be shielded by the second rigid substrate portion from the electrically conductive motor phase lead-in wires arranged radially outside the second rigid substrate portion. The second and third rigid substrate portions are preferably aligned by being bent relative to each other. For example, the angle between the second and third rigid base portions is 15° to 30°, with 20° being particularly preferred. If the end shield is made of plastic, the end shield preferably has at least one retaining structure that form-fits the second and / or third rigid base portions to the end shield. If the end shield is made of metal, the support member preferably has at least one retaining structure that form-fits the second and / or third rigid base portions to the support member. Such retaining structure ensures that the first and second rigid base portions maintain the desired alignment with each other.

[0016] In a preferred embodiment, the end shield has at least one axial break, and at least the second contact area of ​​the connector is intended to protrude through the axial break, i.e., the second contact area of ​​the connector is at least locally located on a different side of the end shield from the circuit board, thereby improving access to the second contact area and thereby simplifying connection of the control device to the connection device.

[0017] The drive device preferably has a plug guide made of plastic arranged on the end shield, radially surrounding the second contact area of ​​the connector at least in a partial area. The plug guide can simplify the plug connection between the second contact area of ​​the connector and the plug receptacle on the control device side. For example, for this purpose, the contact element carrying the plug receptacle can be contoured to the plug guide so that the contact element can be inserted into the plug guide without clearance. The plug guide is preferably configured as a sleeve or guide sleeve. If the end shield is made of plastic, the plug guide is preferably configured integrally with the end shield. If the end shield is made of metal, the plug guide is preferably configured separately from the end shield and attached to it. In this case, for example, the plug guide can be inserted into an axial break in the end shield and attached to it by a locking connection.

[0018] The pressure generator according to the invention for a brake system comprises a pump device and a drive device for operating the pump device. The pressure generator is characterized in that it has the inventive configuration of the drive device according to the features of claim 14, which also results in the advantages already mentioned. Further preferred features and combinations of features become apparent from the above description and the claims.

[0019] The invention will now be described in more detail with reference to the drawings, in which: [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of a pressure generator for a brake installation. [Figure 2] This is the driving device for the pressure generator. [Figure 3] The drive unit end shield and sensor unit. [Figure 4A] FIG. [Figure 4B] FIG. 2 is a front view showing the sensor device. [Figure 5] 10 shows an end shield and a sensor device according to a second embodiment. [Figure 6] 10 is a sensor device according to a second embodiment. [Figure 7] 10 shows an end shield and a sensor device according to a third embodiment. [Figure 8] 10 is another view showing an end shield and a sensor device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] FIG. 1 shows a simplified diagram of a pressure generator 1 for a hydraulic brake system of a motor vehicle. The pressure generator 1 comprises an electric drive unit 2 and a pump unit 3 with at least one fluid pump. A housing 4 of the drive unit 2 is attached to a housing 6 of the pump unit 3 by means of a number of attachment means 5. In this example, the housing 4 is cup-shaped. The drive unit 2 is configured to operate the fluid pump of the pump unit 3. To this end, the drive unit 2 comprises an electric machine 7 arranged in the housing 4, which is therefore not visible in FIG. 1. Furthermore, the pressure generator 1 comprises a control unit 8 for controlling the machine 7. The pump unit 3 is arranged between the drive unit 2 on the one hand and the control unit 8 on the other hand.

[0022] Figure 2 shows a cross-sectional view of the drive unit 2. As can be seen from Figure 2, the drive unit 2 has a drive shaft 10 rotatably supported about an axis of rotation 11 in a housing 4 of the drive unit 2. The drive shaft 10 is operatively connected to a fluid pump of the pumping unit 3 by a transmission, which is not shown for reasons of clarity. This transmission is preferably a planetary gear, the sun gear of which is non-rotatably arranged on the drive shaft 10.

[0023] The electric machine 7 has a rotor 12 arranged non-rotatably on a drive shaft 10. The axis of rotation of the rotor 12 corresponds to the axis of rotation 11 of the drive shaft 10. The electric machine 4 further has a stator 13 arranged fixedly on the housing. The stator 13 has multiphase motor windings, not shown for reasons of clarity, distributed around the rotor 12 so that the rotor 12 and thus the drive shaft 10 can be rotated or driven by suitable energization of the motor windings.

[0024] The drive unit 2 further includes end shields 14 arranged fixedly on the housing 4. In the embodiment shown in FIG. 2, the end shields 14 are made of plastic. The end shields 14 encase the electric machine 7 and thus form a type of housing cover for the housing 3. The end shields 14 are designed to support the drive shaft 10. To this end, the end shields 14 have axially extending sleeve-shaped bearing sections 15. A non-visible rotary bearing, such as a rolling element bearing, is preferably arranged between the bearing section 15 and the drive shaft 10. The end shields 14 further include axially extending sleeve-shaped mounting sections 16. The mounting sections 16 allow the end shields 14 to be attached to the housing 4, for example, by a friction-bonded connection, an adhesive connection, or at least one other fastening means.

[0025] The drive device 2 further includes a sensor device 17 arranged fixedly to the housing, which is configured to detect the rotational position of the rotor 12. The sensor device 17 is attached to the end shield 14. The configuration of the sensor device 17 will be explained in more detail later in connection with Figures 2, 3, 4A, and 4B. To this end, Figure 3 shows another view of the sensor device 17 attached to the end shield 14. Figure 4A shows a rear view of the sensor device 17 without the end shield 14. Figure 4B shows a front view of the sensor device 17 without the end shield 14.

[0026] The sensor device 17 includes a circuit board 18 configured as a rigid-flexible circuit board 18. The circuit board 18 includes a first rigid substrate portion 19. As can be seen in the figures, the first rigid substrate portion 19 is configured in an annular disk shape. The circuit board 18 further includes a second rigid substrate portion 20. In this example, the second rigid substrate portion 20 is configured in a rectangular shape. The second rigid substrate portion 20 is connected to the first rigid substrate portion 19 by a flexible substrate portion 21. In this sense, the second rigid substrate portion 20 is pivotally supported to the first rigid substrate portion 19, thereby allowing the mutual alignment of the first rigid substrate portion 19 and the second rigid substrate portion 20 to be changed by deformation of the flexible substrate portion 21. As can be seen in the figures, the flexible substrate portion 21 is arranged on a radially outer edge 22 of the annular disk shape of the first rigid substrate portion 19. The flexible substrate portion 21 is disposed on a first edge 23 of the second rigid substrate portion 20. The circuit board 18 further includes a third rigid substrate portion 24. The third rigid substrate portion 24 is connected to the second rigid substrate portion 20 by a further flexible substrate portion 25. In this sense, the third rigid substrate portion 24 is pivotally supported on the second rigid substrate portion 20, thereby allowing the mutual alignment of the second rigid substrate portion 20 and the third rigid substrate portion 24 to be changed by deformation of the further flexible substrate portion 25. As can be seen from FIGS. 4A and 4B , the third rigid substrate portion 24 is configured rectangularly in this example. The further flexible substrate portion 25 is disposed on a second edge 26 of the second rigid substrate portion 20, aligned perpendicular to the first edge 23.

[0027] The sensor device 17 has a sensor element 27 arranged on the first rigid substrate part 19. In this example, the sensor device 17 is configured as an inductive sensor 17. To this end, the sensor element 27 has, in this example, one transmitting coil 28 and two receiving coils 29, the coils 28 and 29 being configured as strip conductors on the first rigid substrate part 19.

[0028] The sensor device 17 further comprises an electronics component 30 disposed on the second rigid substrate portion 20. In this example, the electronics component 30 is an application specific integrated circuit (ASIC). The electronics component 30 is electrically connected to the sensor element 27 and is configured to demodulate and / or process the sensor signal of the sensor element 27.

[0029] The sensor device 17 further includes a connection device 31 for electrically connecting the sensor device 17 to the control device 8. In this example, the connection device 31 is arranged on the third rigid board portion 24. The connection device 31 is electrically connected to the electronics component 30. The connection device 31 includes a plurality of conductive connectors 32. In this example, there are four conductive connectors 32. In the sensor device 17 shown in FIG. 4A, the connectors 32 have not yet been arranged on the circuit board 18, whereas in the sensor device 17 shown in FIG. 4B, two connectors 32 have been arranged on the circuit board 18 for the first time.

[0030] The connectors 32 each have a first contact area 33. The first contact areas 33 are press-fit into different press-fit openings 34 in the third rigid base portion 24. The connectors 32 also each have a second contact area 35. The second contact area 35 is electrically connected or connectable to the control device 8. In this example, the second contact area 35 is configured as a plug area 35. A plug receptacle on the control device side can be fitted onto this plug area 35 to electrically connect the sensor device 17 to the control device 8. The connectors 32 are configured in a bent shape in this example. As can be seen from FIGS. 2 and 3, the angle between the first contact area 33 and the second contact area 35 is 90° in this example.

[0031] Circuit board 18 has a first end surface 36 and a second end surface 37. First end surface 36 is hereinafter referred to as the front surface 36. Second end surface 37 is hereinafter referred to as the back surface 37. Front surface 36 is formed by a front surface area 36A of first rigid substrate portion 19, a front surface area 36B of second rigid substrate portion 20, and a front surface area 36C of third rigid substrate portion 24. Back surface 37 is formed by a back surface area 37A of first rigid substrate portion 19, a back surface area 37B of second rigid substrate portion 20, and a back surface area 37C of third rigid substrate portion 24. When rigid substrate portions 19, 20, and 24 are aligned parallel to one another and positioned at the same height, as shown in FIGS. 4A and 4B, front surface areas 36A, 36B, and 36C lie in the same plane. When the rigid substrate portions 19, 20 and 24 are aligned at an angle relative to one another, as shown in Figures 2 and 3, the front surface areas 36A, 36B and 36C are also aligned at an angle relative to one another, and the same applies to the back surface areas 37A, 37B and 37C.

[0032] The sensor element 27 of the sensor device 17 is disposed on a front surface area 36A of the first rigid substrate portion 19. The electronic component 30 is disposed on a back surface area 37B of the second rigid substrate portion 20. That is, the sensor element 27 and the electronic component 30 are disposed on different end faces of the circuit board 18.

[0033] The mounting of the sensor device 17 on the end shield 14 will be described in more detail below with the aid of Figures 2 and 3. When the sensor device 17 is mounted on the end shield 14, the first rigid circuit board 19 is arranged coaxially with the drive shaft 10. The front area 36A of the first rigid board part 19 then faces the rotor 12, so that the sensor element 27 axially faces the rotor 12 or a measurement detector 38 non-rotatably connected to the rotor 12. The flexible board part 21 is deformed so that the second rigid board part 20 is aligned parallel to the rotation axis 11 of the rotor 12 or perpendicular to the first rigid board part 19. The back area 37B now faces radially inward, so that the electronics component 30 is arranged radially inside the second rigid board part 20. The other flexible substrate portion 25 is deformed so that the angle between the second rigid substrate portion 20 and the third rigid substrate portion 24 is approximately 20°. The second contact area 35 of the connector 32 protrudes through a respective axial break 39 in the end shield 14. Accordingly, the second contact area 35 is at least locally located on a different side of the end shield 14 from the circuit board 18. This allows the second contact area 35 to be easily accessible for connection to the control device 8.

[0034] 2 and 3, the circuit board 18 is attached directly to the end shield 14 by an adhesive bond, which comprises an adhesive layer 40 in direct contact with the end shield 14 on the one hand and the first rigid substrate portion 19 on the other hand.

[0035] 3, the end shield 14 has a plurality of retaining structures 41 through which the second rigid base portion 20 and the third rigid base portion 24 are form-fitted to the end shield 14. In this example, the retaining structures 41 are integral with the end shield 14. In this sense, the retaining structures 41 are made of plastic.

[0036] 2 and 3, the drive device 2 has a plug guide 42 in the form of a guide sleeve 42 which radially surrounds at least a partial area of ​​the second contact area 35. In this example, the plug guide 42 is formed integrally with the end shield 14. In this sense, the plug guide 42 is made of plastic.

[0037] Figure 5 shows the end shield 14 and sensor device 17 according to a second embodiment. Figure 6 shows the sensor device 17 shown in Figure 5 without the end shield 14. The second embodiment shown in Figures 5 and 6 differs from the embodiment shown in Figures 2, 3, 4A and 4B essentially in terms of the attachment of the sensor device 17 to the end shield 14.

[0038] In a second embodiment shown in Figures 5 and 6, the sensor device 17 is directly attached to the end shield 14 by a plurality of attachment means 43. To this end, the first rigid base plate part 19 has a plurality of radial protrusions 44 on its radially outer edge 22, each having a press-fit opening 45. The end shield 14 has a number of blind holes 46 corresponding to the number of press-fit openings 45. The attachment means 43 are configured as press-fit pins 43. Each press-fit pin 43 has a first end section 47 and a second end section 48. The first end sections 47 are press-fit into different press-fit openings 45. The second end sections 48 are press-fit into different blind holes 46.

[0039] 7 and 8 show an end shield 14 and a sensor device 17 according to a third embodiment. In the third embodiment, the end shield 14 is made of a metal material. The circuit board 18 is attached to the end shield 14 by a support member 49 made of plastic. The support member 49 is disposed between the end shield 14 and the first rigid substrate portion 19. In this example, the support member 49 is attached to the end shield 14 by a first adhesive bond. To this end, a first adhesive layer 50 is in direct contact with the end shield 14 and the support member 49. The first rigid substrate portion 19 is attached to the support member 49 by a second adhesive bond. To this end, a second adhesive layer 51 is in direct contact with the support member 49 and the first rigid substrate portion 19.

[0040] 8, the support member 49 has a plurality of retaining structures 52 by which the second rigid base portion 20 and the third rigid base portion 24 are form-fitted to the support member 49. The retaining structures 52 are integral with the support member 49 and, in this sense, are made from plastic.

[0041] As can be seen from Figure 8, instead of the axial breaks 39, the end shield 14 has only one axial break 53, through which the second contact area 35 of the connector 32 protrudes. In the third embodiment shown in Figures 7 and 8, the plug guide 42 is part of a component 54 made from plastic that is inserted into the axial break 53 and attached to the end shield 14 by a locking connection. [Explanation of symbols]

[0042] 1 pressure generator 2. Drive unit 3. Pumping equipment 4. Housing 7 Electrical Machinery 8 Control Equipment 11 Rotation axis 12 rotors 14 End Shield 17 Sensor Device 18 Circuit Board 19 First hard substrate portion 20 Second hard substrate portion 21 Flexible board part 24 Third hard substrate part 25 Another flexible board part 27 Sensor material 30 Electronics Components 31 Connection device 32 connectors 33 First Contact Area 34 Press-fit opening 35 Secondary Contact Area 36,37 Circuit board edge 39 Axial fracture 42 Plug guide 49 Support member 53 Axial fracture

Claims

1. A sensor device (17) for detecting a rotational position of a rotor of an electric machine, the sensor device (17) having at least one sensor element (27) and at least one electronic component (30) electrically connected to the sensor element (27), the sensor element (27) and the electronic component (30) being arranged on a common circuit board (18) of the sensor device (17), the circuit board (18) having at least one first rigid substrate portion (19), a second rigid substrate portion (20), and a flexible substrate portion (21), the second rigid substrate portion (20) being connected to the first rigid substrate portion (19) by the flexible substrate portion (21), the sensor element (27) being arranged on the first rigid substrate portion (19), and the electronic component (30) being arranged on the second rigid substrate portion (20); 10. A sensor device, characterized in that the first rigid substrate part (19) is configured in the shape of an annular disk.

2. A sensor device as described in claim 1, characterized in that the sensor element (27) and the electronic component (30) are arranged on different end faces (36, 37) of the circuit board (18).

3. A sensor device (17) for detecting the rotational position of a rotor of an electric machine, comprising at least one sensor element (27) and at least one electronic component (30) electrically connected to the sensor element (27), wherein the sensor element (27) and the electronic component (30) are arranged on a common circuit board (18) of the sensor device (17), wherein the circuit board (18) has at least one first rigid substrate portion (19), a second rigid substrate portion (20) and a flexible substrate portion (21), wherein the second rigid substrate portion (20) is connected to the first rigid substrate portion (19) by the flexible substrate portion (21), the sensor element (27) is arranged on the first rigid substrate portion (19), and the electronic component (30) is arranged on the second rigid substrate portion (20), The circuit board (18) has a third rigid substrate portion (24) and another flexible substrate portion (25), the third rigid substrate portion (24) is connected to the second rigid substrate portion (20) by the other flexible substrate portion (25), and a connection device (31) for electrically connecting the sensor device (17) to a control device (8) is arranged on the third rigid substrate portion (25).

4. A sensor device as described in claim 3, characterized in that the connection device (31) has at least one conductive connector (32) having a first contact area (33) and a second contact area (35), the first contact area (33) is pressed into a press-fit opening (34) of the third rigid substrate portion (24), and the second contact area (35) is electrically connected or connectable to the control equipment (8).

5. A sensor device as described in Claim 4, characterized in that the connector (32) is configured to be bent.

6. A drive device having an electric machine (7) arranged in a housing (4) having a rotatably supported rotor (12), and a sensor device (17) fixed to the housing and arranged to detect the rotational position of the rotor (12), characterized in that the sensor device (17) has the configuration described in claim 4 or 5.

7. A drive device as described in Claim 6, characterized in that the drive device (2) has an end shield (14) and the circuit board (18) of the sensor device (17) is attached to the end shield (14).

8. A drive device as described in Claim 7, characterized in that the end shield (14) is made of a metal material and the circuit board (18) is attached to the end shield (14) by a support member (49) made of plastic.

9. A drive device as described in claim 7, characterized in that the end shield (14) is made of plastic and the circuit board (18) is directly attached to the end shield (14).

10. A drive device as described in claim 6, characterized in that the first rigid substrate portion (19) is aligned perpendicular to the rotation axis (11) of the rotor (12) and the second rigid substrate portion (20) is aligned parallel to the rotation axis (11) of the rotor (12).

11. A drive device as described in Claim 7, characterized in that the end shield (14) has at least one axial break (39, 53) and at least the second contact area (35) of the connector (32) protrudes through the axial break (39, 53).

12. A drive unit as described in Claim 11, characterized in that it has a plug guide portion (42) made of plastic arranged on the end shield (14) and radially surrounding the second contact area (35) of the connector (32) at least in a partial area.

13. A pressure generator for brake equipment having a pump device (3) and a drive device (2) for operating the pump device (3), characterized in that the drive device (2) has the configuration described in claim 6.

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