Rotational-angle detection system for detecting the rotational angle of a rotary brake drive for a rail vehicle

Abstract

The present invention relates to a rotational-angle detection system (1, 1') for detecting the rotational angle of a rotary brake drive for a rail vehicle, comprising: at least one sensor unit (30, 30') for detecting a rotational angle, which is operatively connectable to the rotary brake drive; and at least one electronics main path (10, 10') and at least one electronics safety path (20, 20') for each sensor unit (30, 30'), wherein the at least one electronics main path (10, 10') and the at least one electronics safety path (20, 20') is each operatively connectable to the at least one sensor unit (30, 30') as an individual path, wherein the at least one electronics main path (10, 10') and the at least one electronics safety path (20, 20') each comprises at least one signal provision unit (14, 15, 16, 18, 24, 25, 16, 28).

Description

[0001] DESCRIPTION

[0002] Angle detection system for detecting the angle of rotation of a rotary brake drive for a rail vehicle

[0003] The present invention relates to a rotation angle detection system for detecting the rotation angle of a rotary brake drive for a rail vehicle, as well as to a braking system for a rail vehicle and to a rail vehicle having such a rotation angle detection system.

[0004] In rail vehicles, for example, electromechanical brake actuators such as brake cylinders are designed in such a way that electrical energy is converted into mechanical energy with the help of an electric motor. When the brake actuator or brake cylinder is actuated, the rotor of the electric motor is set in a rotary motion. This rotation and the associated drive torque are transmitted via a shaft to a spindle nut installed in or on the shaft. Axial fixation of the spindle nut results in a feed movement of the spindle, an example of a converter from a rotary motion to a linear motion. In a further step, a mechanical transmission stage causes the caliper levers to move, which causes the brake pads to apply pressure to a brake disc and builds up contact force from the pads. To release the brake, the motor rotates in the opposite direction, thus reversing the screw drive.

[0005] To control the electric motor, for example, a permanent magnet synchronous motor (PMSM), an angle encoder is used to detect the rotor position. To achieve a high level of reliability of the drive system, such as Safety Integrity Level 4 (SIL4), at least two encoder systems are often used, as this provides redundancy in the event of a sensor system failure.

[0006] However, due to the limited space available for such an installation and also due to cost considerations, two or more sensors and components are very difficult or even impossible to implement. This is particularly true for a brake actuator housing on a rail vehicle, which is limited in its maximum dimensions due to the space available in the bogie.

[0007] In view of the above, it is therefore the object of the present invention to provide a rotation angle detection system which is improved compared to the prior art, in particular with regard to the required installation space.

[0008] This problem is solved by the subject matter of the independent claims. Advantageous further developments are the subject matter of the dependent claims.

[0009] According to the invention, a rotation angle detection system for detecting the rotation angle of a rotary brake drive for a rail vehicle has at least one sensor unit for detecting a rotation angle, which can be operatively connected to the rotary brake drive, and at least one main electronic path and at least one electronic safety path per sensor unit, wherein the at least one main electronic path and the at least one electronic safety path can each be operatively connected as an individual path to the at least one sensor unit, wherein the at least one main electronic path and the at least one electronic safety path each have at least one signal processing unit.

[0010] The basic idea of ​​the present invention is therefore based on the fact that instead of two or more complete sensor paths, which have both the sensor unit itself and a signal processing unit, for example a corresponding signal processing electronics, a sensor unit with two or more signal processing units is used in order to achieve redundancy, wherein at least one of the signal processing units is assigned to a main electronic path and at least one of the signal processing units is assigned to an electronic safety path.

[0011] The main electronic path and the electronic safety path are separate individual paths that are connected in parallel or run entirely separately. The main electronic path can be understood as the electronic path that is operatively connected to the sensor unit during fault-free operation, enabling it to transmit sensor signals or other signals, such as control signals or the like, unidirectionally or bidirectionally. Accordingly, the electronic safety path can only be operatively connected to the sensor unit if a fault prevents or otherwise disrupts transmission via the main electronic path.Alternatively, the main electronic path and the electronic safety path can be permanently or at least temporarily simultaneously operatively connected to the sensor unit, enabling a plausibility check of the transmitted signals or allowing the signals to be transmitted via the electronic safety path without delay even if the main electronic path fails. The operative connectivity of the main electronic path and the electronic safety path relates to both a direct and indirect connection of the individual paths for signal transmission. Furthermore, the operative connection can also refer to an actual activation of the individual paths or the respective signal processing unit. In other words, at least one of the signal processing units can, for example, be constantly physically connected to the sensor unit, although strictly speaking, an operative connection only occurs upon activation of the corresponding signal processing unit.

[0012] The operative connectivity of the sensor unit with the rotary brake drive can include both a direct and indirect connection. The connection can be mechanical and / or signal-based. The sensor unit can thus generate at least one signal representing a rotation angle, both through direct contact and via optical, acoustic, and / or electrical or electromagnetic signals in interaction with the rotary brake drive. This signal can be forwarded to the respective signal processing unit via the main electronics path and / or the electronic safety path.

[0013] By designing the angle of rotation detection system with a sensor unit with redundant individual paths, a reduction in the required installation space can be supported, in particular, by the fact that the respective signal processing units can be implemented using small microelectronic and / or highly integrated components, which require comparatively little space even with a redundant design of the individual paths. The redundant design of the individual paths, i.e., the electronic safety path with respect to the main electronic path or the respective signal processing units, can refer to an identical functional implementation or to a redundancy of predetermined, particularly safety-relevant, functions.

[0014] According to one embodiment, the sensor unit is equipped with a higher degree of reliability than the at least one main electronic path and / or the at least one electronic safety path. In particular, the sensor unit has non-volatile properties with respect to the higher degree of reliability.

[0015] Accordingly, the sensor unit, such as a single sensor element, is designed to be simple, reliable, and fail-safe in order to achieve the highest possible reliability. This can be achieved, for example, through suitable measures such as a durable mechanical design, reinforced insulation, larger cable cross-sections, and / or the use of aging-resistant materials. In particular, the sensor unit is designed so that its properties are "captive" over a defined period of use or even over its entire service life. The term "captive properties" in this context refers to an unforeseeable failure. Since the signal conditioning units or the associated individual paths are designed redundantly, at least in predefined functionalities, functionalities with lower reliability can be transferred to these individual paths.Especially with regard to a signal processing unit with corresponding components of usually comparatively higher complexity, which have a higher probability of failure, the higher probability of failure can be at least partially compensated by redundancy.

[0016] According to one embodiment, the signal processing unit of the at least one main electronic path and / or the at least one electronic safety path has at least one signal converter. Via the at least one signal converter, sensor signals transmitted by the sensor unit, for example, can be converted into signals that can be processed by further signal processing components. The signal converter can, for example, be an A / D converter that converts an analog signal from the sensor unit into a digital format.

[0017] According to one embodiment, the signal conditioning unit of the at least one electronic main path and / or the at least one electronic safety path has at least one signal processing unit.

[0018] For example, the signal processing unit further processes the sensor unit's signal, which has optionally been previously converted via the signal converter. Further processing can include, among other things, calculating it into another value, taking into account additional signal inputs, and / or another form of signal processing to determine the angle of rotation of the rotary brake drive based on the sensor unit's signal.

[0019] According to one embodiment, the signal processing unit of the at least one electronic main path and / or the at least one electronic safety path has at least one signal output unit.

[0020] The signal output unit outputs the angle of rotation of the rotary brake drive determined based on the signal from the sensor unit. The signal output unit can be a separate unit from the signal conditioning unit or integrated into the above-mentioned signal processing unit. Conversely, the signal output unit can also include signal processing functions.

[0021] According to one embodiment, the at least one main electronic path and / or the at least one electronic safety path have or have at least one signal switch, via which the at least one signal processing unit can be operatively connected to the at least one sensor unit. Via such a signal switch, the at least one main electronic path and / or the at least one electronic safety path can thus be selectively connected to the sensor unit and disconnected again. If an error in the at least one main electronic path and / or the at least one electronic safety path could be transferred to the sensor unit or could otherwise have a negative impact on the sensor unit, this is prevented by disconnecting the faulty individual path. In addition, the signal switch can also be used to specifically connect to the sensor unit.For example, initially only one individual path can be connected to the sensor unit. If this individual path fails or for other reasons, the other individual path is connected or switched over to via the signal switch. The term "connection" refers to the connection of both individual paths, while "switching over" disconnects the previous individual path.

[0022] According to one embodiment, the at least one electronic main path and / or the at least one electronic safety path comprise or comprise at least one energy supply unit that is operatively connectable to the at least one sensor unit.

[0023] The sensor unit therefore does not necessarily require its own power supply, but can be supplied with power via the at least one main electronic path and / or the at least one electronic safety path. If both the at least one main electronic path and / or the at least one electronic safety path have at least one power supply unit or a corresponding connection to a power supply unit, the reliability can be further increased.

[0024] According to one embodiment, the at least one main electronic path and / or the at least one safety electronic path comprise or comprise at least one power supply switch, via which the at least one power supply unit can be operatively connected to the at least one sensor unit. Similar to the signal switch, a targeted connection and disconnection of the respective power supply unit can thus also be achieved here.

[0025] In particular, the at least one electronic main path and / or the at least one electronic safety path and / or the at least one signal switch and / or the at least one power supply switch can be controlled via a control signal of a control unit.

[0026] Such a control unit preferably comprises a monitoring function or is at least signal-connected to a corresponding monitoring unit in order to control the at least one signal switch and / or the at least one power supply switch via a control signal in the event of a failure or error of an individual path or a signal processing unit or power supply unit. The control can be designed such that the at least one main electronic path is controlled first, and only if there is no feedback or in accordance with an error detected otherwise is the at least one safety electronic path controlled. Correspondingly, the control unit can then also control the at least one signal switch and / or the at least one power supply switch.The at least one signal switch and / or the at least one power supply switch can also be controlled via the respective at least one main electronic path and / or the at least one electronic safety path. The control unit can be part of the angle of rotation detection system, for example, part of the at least one main electronic path and / or the at least one electronic safety path, or can also be an external control unit.

[0027] According to one embodiment, the sensor unit is a resolver or has at least one resolver.

[0028] A resolver is a rotary angle sensor which, similar to an electric motor, comprises a rotor and a stator. The rotor of the resolver can be made of a material with good magnetic conductivity and forms the magnetic return for the magnetic field generated by the stator. If we look at the winding in the stator of the resolver, two different areas can be distinguished. The first area corresponds to a rotary transformer, with the winding arranged concentrically around the rotor. In the second area, the winding structure corresponds to the structure of a motor winding with two phases which are, however, not connected to each other. The two winding areas are spatially separated from one another and magnetically coupled only by the rotor and the stator return. For example, the excitation winding of the resolver is excited with a sinusoidal or rectangular, high-frequency voltage, typically in the range of 2 kHz to 10 kHz.The alternating magnetic field is transmitted exclusively to the measuring windings by the rotor, where its amplitude is modulated. The voltages in the measuring windings can be used as evaluation variables. A sine wave and a cosine wave are then provided as output signals. Since the magnetic excitation of the rotor is achieved with an alternating voltage of constant amplitude, it induces a voltage in the measuring windings whose amplitude is independent of the speed of the brake drive shaft. The amplitudes of the voltages in the measuring windings therefore depend only on the rotor angle or the position of the rotor or shaft.

[0029] Due to the design of the resolver, which does not use any mechanical components subject to wear, such as ball bearings, or any electronic components, such as microprocessors, semiconductors or capacitors with solid electrolyte, the resolver itself offers a very high level of reliability.

[0030] In particular, the at least one electronic main path and / or the at least one electronic safety path comprise or comprise at least one resolver-digital converter.

[0031] By using at least one resolver-to-digital converter, the resolver can be easily operated as a sensor unit. Since a resolver-to-digital converter is a microprocessor-like electronic component with a complex structure and / or lower reliability, at least one resolver-to-digital converter is provided in each of the at least one main electronic path and the at least one safety electronic path.

[0032] According to a further development, the at least one resolver-digital converter is designed to magnetically excite a rotor of the resolver, in particular with an alternating voltage with a constant amplitude, and to receive sine and cosine signals from a stator of the resolver.

[0033] According to the resolver's functionality described above, the control or excitation signals for the resolver can be transmitted by the resolver-to-digital converter, and conversely, output signals representing the angle of rotation can be received by the resolver. Accordingly, the at least one resolver-to-digital converter can be designed to generate the appropriate excitation signal for the resolver. Furthermore, the at least one resolver-to-digital converter can be designed not only to receive the two output signals of the resolver, i.e., the sine and cosine signals, but also to further process them and to transmit a rotation angle of the rotary brake drive or an output signal representing this rotation angle as a measured variable to a higher-level system, for example, via a digital interface.

[0034] According to one embodiment, the at least one resolver-digital converter or a further signal processing unit is designed to determine the rotational angle position from the sine and cosine signals of the stator of the resolver, in particular taking into account a number of pole pairs of the resolver.

[0035] The evaluation of the resolver signals, i.e., the sine and cosine signals, is carried out, for example, by forming the arctangent, which allows the electrical angular position to be output. By including the number of pole pairs of the resolver, output as a mechanical angular position is also possible. Furthermore, diagnosis of the resolver is possible using the two output signals and the application of trigonometric calculations. According to a further aspect, the present invention relates to a braking system for a rail vehicle, which has at least one brake actuator for applying a braking force, at least one rotary brake drive for actuating the brake actuator, and at least one angular position detection system as described above.

[0036] The features described in the above description of the angle of rotation detection system equally relate to advantageous developments of the braking system according to the invention and vice versa.

[0037] According to a further aspect, the present invention relates to a rail vehicle with at least one rotation angle detection system described above and / or a braking system described above, wherein at least the sensor unit is arranged in a bogie of the rail vehicle.

[0038] The features described in the above description of the angle of rotation detection system relate equally to advantageous developments of the rail vehicle according to the invention and vice versa.

[0039] The embodiments of the invention described above and below are not to be considered limiting the subject matter of the invention. Rather, further subject matters according to the invention can be obtained by adding, omitting, or interchanging individual features.

[0040] Preferred embodiments of the invention are described below with the aid of the accompanying drawings.

[0041] Show in detail

[0042] Fig. 1 is a schematic representation of a rotation angle detection system for a rail vehicle according to an exemplary first embodiment; and Fig. 2 is a schematic representation of a rotation angle detection system for a rail vehicle according to an exemplary second embodiment.

[0043] Fig. 1 shows a schematic representation of a rotation angle detection system 1 for a rail vehicle according to an exemplary first embodiment. The rotation angle detection system 1 has a sensor unit 30 that can detect the rotation angle of a rotary brake drive (not shown) of a rail vehicle. For this purpose, the rotation angle detection system is arranged in a bogie, here, for example, contained in an electromechanical brake caliper that is arranged in a bogie of the rail vehicle. In alternative embodiments, the rotation angle detection system 1 can also be arranged only partially in the brake caliper or even in the bogie.

[0044] In addition, the rotation angle detection system 1 has a main electronic path 10 and an electronic safety path 20, each of which is connected as individual paths to the sensor unit 30. The main electronic path 10 and the electronic safety path 20 each have a signal converter 14, 24, a signal processing unit 15, 25, and a signal output unit 16, 26 as parts of a signal conditioning unit formed from these components, which conditions the sensor signal of the sensor unit. Furthermore, the main electronic path 10 and the electronic safety path 20 each have a power supply unit 11, 21 to supply the sensor unit with power. The connection of the sensor unit 30 to the power supply by the respective power supply unit 11, 21 is established via a respective power supply switch 12, 22.Similarly, the sensor unit is connected to the signal conditioning via the respective signal converters 14, 24, the respective signal processing units 15, 25, and the respective signal output units 16, 26 via a respective signal switch 13, 23. The signal switches 13, 23 and the power supply switches 12, 22 are controlled by a respective control signal 17, 27 provided by a control unit 40. The control signal 17 serves to control the signal switch 13 and the power supply switch 12 of the main electronic path 10, while the signal switch 23 and the power supply switch 22 of the electronic safety path 20 are controlled via the control signal 27.If, for example, the angle of rotation detection and power supply are carried out via the main electronics path and an error or failure is detected during execution, the control unit 40 outputs a control signal 17 to open the signal switch 13 and the power supply switch 12 and thus disconnect a respective connection to the sensor unit 30. In addition, the control unit 40 outputs a control signal 27 to the electronics safety path 20 to close the signal switch 23 and the power supply switch 22, so that the sensor unit 30 is connected to the electronics safety path 20. If a failure or error only affects the power supply, only the corresponding power supply switches 12, 22 can be switched. Likewise, only the signal switches 13, 23 can be switched if the respective active power supply unit 11, 21 is not affected by the error or failure.

[0045] The main electronic path 10 and the electronic safety path 20 have identical functional scopes in order to realize complete redundancy of the main electronic path 10 and the electronic safety path 20. In alternative embodiments, however, the main electronic path 10 and the electronic safety path 20 can also have only partially identical functional scopes, for example, to implement only safety-relevant functions redundantly.

[0046] According to the above statements, the rotation angle detection system 1 therefore does not have redundant sensor units with respective electronic paths for signal processing, but the redundancy is shifted to the signal processing by the individual paths which are at least partially redundantly designed by the electronic main path 10 and the electronic safety path 20 and which can each be connected to the non-redundant sensor unit 30.

[0047] Fig. 2 shows a schematic representation of a rotation angle detection system 1' for a rail vehicle according to an exemplary second embodiment. The rotation angle detection system 1' of the second embodiment differs from the rotation angle detection system 1 of the first embodiment in that the sensor unit in the second embodiment is formed by a resolver 30'. Furthermore, in the rotation angle detection system 1', the power supply in the form of an excitation signal for the resolver 30' and the signal conditioning according to sine signals and cosine signals received by the resolver 30' in the main electronics path 10' and the electronics safety path 20', each connected to the resolver 30', take place via a resolver-to-digital converter 18, 28 provided in the main electronics path 10' and the electronics safety path 20', respectively.The excitation signal can be transmitted to the resolver 30' either from the resolver-to-digital converter 18 in the main electronic path 10' or from the resolver-to-digital converter 28 in the electronic safety path 20', depending on the circuit of a respective excitation signal switch 13a', 23a'. Resolver 30' outputs sine and cosine signals corresponding to the excitation signal in conjunction with the current rotation angle of the rotary brake drive. The sine signals are transmitted optionally to the resolver-to-digital converter 18 in the main electronic path 10' or to the resolver-to-digital converter 28 in the electronic safety path 20', depending on the switch position of a sine signal switch 13b', 23b' located in both the main electronic path 10' and the electronic safety path 20'.In alternative embodiments, for example, for control reasons, it may also be provided to transmit the sine signals both to the resolver-to-digital converter 18 in the main electronic path 10' and to the resolver-to-digital converter 28 in the electronic safety path 20'. Comparably for transmitting the sine signals, the cosine signals are transmitted, depending on the switch position of a cosine signal switch 13c', 23c' arranged in both the main electronic path 10' and the electronic safety path 20', either to the resolver-to-digital converter 18 in the main electronic path 10' or to the resolver-to-digital converter 28 in the electronic safety path 20'. In alternative embodiments, it may also be provided, for example for control reasons, to transmit the cosine signals both to the resolver-digital converter 18 in the main electronic path 10' or to the resolver-digital converter 28 in the safety electronic path 20'.

[0048] The respective resolver-digital converter 18, 28 is designed in such a way that the resolver-digital converter 18, 28 determines a rotation angle of the rotary brake drive from the transmitted sine and cosine signals by forming the arctangent and outputs it, for example a higher-level control unit, such as the

[0049] Control unit 40.

[0050] LIST OF REFERENCE SYMBOLS

[0051] 1, r rotation angle detection system

[0052] 10, 10' Electronics Main Trail

[0053] 11 Power supply unit (main electronics path)

[0054] 12 Power supply switch (electronic main path)

[0055] 13 Signal switch (electronic main path)

[0056] 13a' Excitation signal switch (main electronic path)

[0057] 13b' Sinusoidal signal switch (main electronic path)

[0058] 13c' Cosine signal switch (main electronic path)

[0059] 14 Signal converter (main electronic path)

[0060] 15 Signal processing unit (main electronics path)

[0061] 16 Signal output unit (main electronic path)

[0062] 17 Control signal (main electronic path)

[0063] 18 Resolver-to-digital converter (main electronics path)

[0064] 20, 20' Electronic Safety Path

[0065] 21 Power supply unit (electronic safety path)

[0066] 22 Power supply switch (electronic safety path)

[0067] 23 Signal switch (electronic safety path)

[0068] 23a' Excitation signal switch (electronic safety path)

[0069] 23b' Sinusoidal signal switch (electronic safety path)

[0070] 23c' Cosine signal switch (electronic safety path)

[0071] 24 signal converters (electronic safety path)

[0072] 25 Signal processing unit (electronic safety path)

[0073] 26 Signal output unit (electronic safety path)

[0074] 27 Control signal (electronic safety path)

[0075] 28 Resolver-digital converter (electronic safety path)

[0076] 30 Sensor unit

[0077] 30' Resolver

[0078] 40 Control unit

Claims

PATENT CLAIMS 1 . A rotation angle detection system (1, 1') for detecting the rotation angle of a rotary brake drive for a rail vehicle, comprising: at least one sensor unit (30, 30') for detecting a rotation angle, which is operatively connectable to the rotary brake drive, and at least one main electronic path (10, 10') and at least one electronic safety path (20, 20') per sensor unit (30, 30'), wherein the at least one main electronic path (10, 10') and the at least one electronic safety path (20, 20') are each operatively connectable as a single path to the at least one sensor unit (30, 30'), wherein the at least one main electronic path (10, 10') and the at least one electronic safety path (20, 20') each have at least one signal processing unit (14, 15, 16, 18, 24, 25, 16, 28).

2. Rotation angle detection system (1, 1') according to claim 1, wherein the sensor unit (30, 30') is equipped with a higher level of reliability, in particular has non-losable properties, than the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20').

3. Rotation angle detection system (1, 1') according to claim 1 or 2, wherein the signal processing unit of the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') comprises at least one signal converter (14, 18, 24, 28).

4. Rotation angle detection system (1, 1') according to one of the preceding claims, wherein the signal conditioning unit of the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') has at least one signal processing unit (15, 18, 25, 28).

5. Rotation angle detection system (1, 1') according to one of the preceding claims, wherein the signal processing unit of the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') has at least one signal output unit (16, 18, 26, 28).

6. Rotation angle detection system (1, 1') according to one of the preceding claims, wherein the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') has or comprises at least one signal switch (13, 13a', 13b', 13c', 23, 23a', 23b', 23c') via which the at least one signal processing unit (14, 15, 16, 18, 24, 25, 16, 28) can be operatively connected to the at least one sensor unit (30, 30').

7. Rotation angle detection system (1, 1') according to one of the preceding claims, wherein the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') comprise or comprises at least one energy supply unit (11, 21) which is operatively connectable to the at least one sensor unit (30, 30').

8. Rotation angle detection system (1, 1') according to one of the preceding claims, wherein the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') comprise or comprise at least one power supply switch (12, 22) via which the at least one power supply unit (11, 21) can be operatively connected to the at least one sensor unit (30, 30').

9. Rotation angle detection system (1, 1') according to claim 6 or 8, wherein the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') and / or the at least one signal switch (13, 13a', 13b', 13c', 23, 23a', 23b', 23c') and / or the at least one power supply switch (12, 22) is / are controllable via a control signal (17, 27) of a control unit (18, 40).

10. Rotation angle detection system (1') according to one of the preceding claims, wherein the sensor unit (30') is a resolver (30') or has at least one resolver (30').

11. Rotation angle detection system (1') according to claim 10, wherein the at least one electronic main path (10, 10') and / or the at least one electronic safety path (20, 20') comprise or comprise at least one resolver-digital converter (18, 28).

12. Rotation angle detection system (1 ') according to claim 11, wherein the at least one resolver-digital converter (18, 28) is designed to excite a rotor of the resolver (30') magnetically, in particular with an alternating voltage with a constant amplitude, and to receive sine and cosine signals of a stator of the resolver (30').

13. Rotation angle detection system (1 ') according to claim 12, wherein the at least one resolver-digital converter (18, 28) or a further signal processing unit (14, 15, 16, 24, 25, 16) is designed to determine the rotation angle position from the sine and cosine signals of the stator of the resolver (30'), in particular taking into account a number of pole pairs of the resolver (30').

14. Braking system for a rail vehicle, comprising: at least one brake actuator for applying a braking force, at least one rotary brake drive for actuating the brake actuator, and at least one rotation angle detection system (1, 1') according to one of claims 1 to 13.

15. Rail vehicle with at least one rotation angle detection system (1, 1') according to one of claims 1 to 13 and / or a braking system according to claim 14, wherein at least the sensor unit (30, 30') is arranged in a bogie of the rail vehicle.

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