Rotation angle detection system for rotation angle detection of rotary brake drive of rail vehicle

Abstract

The invention relates to a rotational angle detection system (1, 1 ') for detecting the rotational angle of a rotary brake drive of a rail vehicle, comprising: at least one sensor unit (30, 30') for detecting the rotational angle, which sensor unit can be operatively connected to the rotary brake drive, and for each sensor unit (30, 30 '), at least one electronic device main path (10, 10') and at least one electronic device security path (20, 20 '), each of which can be operatively connected as a single path to the at least one sensor unit (30, 30'), the at least one electronic device main path (10, 10 ') and the at least one electronic device safety path (20, 20') each have at least one signal preparation unit (14, 15, 16, 18, 24, 25, 16, 28).

Description

Technical Field

[0001] The invention relates to a rotation angle detection system for detecting the rotation angle of a rotary brake drive of a rail vehicle, a braking system for a rail vehicle and a rail vehicle having such a rotation angle detection system. Background Art

[0002] In rail vehicles, for example, electromechanical brake actuators, such as brake cylinders, are designed so that electrical energy is converted into mechanical energy by means of an electric motor. When the brake actuator or brake cylinder is actuated, the rotor of the electric motor is set into rotational motion. This rotation or the associated driving torque is transmitted via the shaft to the spindle nut mounted in or on the shaft. The feed motion of the spindle is generated by axially fixing the spindle nut as an example of a converter from rotational motion to linear motion. In a further step, a movement of the caliper lever occurs by means of a mechanical transmission stage, which causes the brake lining to rest on the brake disc and causes the formation of a contact pressure of the lining. In order to release the brake, the motor rotates in the opposite direction and thus returns the threaded drive.

[0003] Rotary angle encoders are used to detect the rotor position in order to control electric motors, such as permanent magnet synchronous motors or PMSMs for short. Therefore, in order to achieve a high failure safety of the drive system, such as in Safety Integrity Level 4 (SIL4), at least two encoder systems are usually used, because redundancy is thus provided in the event of failure of one encoder system.

[0004] However, due to the limited space available for the corresponding installation and also from a cost point of view, two or more sensors and components can only be realized with difficulty or not at all. This applies in particular to the brake actuator housing of rail vehicles, which is limited in its maximum size due to the spatial conditions in the bogie. Summary of the invention

[0005] Taking into account the above-described embodiments, it is therefore an 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.

[0006] The object is achieved by the subject matter of the independent claim. Advantageous developments are the subject matter of the dependent claims.

[0007] According to the present invention, a rotation angle detection system for detecting the rotation angle of a rotary brake drive device of a rail vehicle comprises: at least one sensor unit for detecting the rotation angle, the sensor unit being operatively connectable to the rotary brake drive device, and at least one electronic device main path and at least one electronic device safety path for each sensor unit, wherein the at least one electronic device main path and the at least one electronic device safety path are operatively connectable to the at least one sensor unit as single paths, respectively, wherein the at least one electronic device main path and the at least one electronic device safety path respectively have at least one signal preparation unit.

[0008] The basic idea of ​​the present invention is therefore based on the use of a sensor unit together with two or more signal preparation units to achieve redundancy, instead of two or more complete sensor paths, which have both the sensor unit itself and a signal preparation unit (e.g. corresponding signal processing electronics), wherein the electronics main path is respectively equipped with at least one of said signal preparation units and the electronics safety path is respectively equipped with at least one of said signal preparation units.

[0009] The electronic device main path and the electronic device safety path are separate individual paths, which are connected in parallel to each other or extend separately from each other in principle. Here, the electronic device main path can be understood as an electronic device path that is operatively connected to the sensor unit in interference-free operation, so that the sensor signal or other additional signals, such as control signals, can be guided unidirectionally or bidirectionally. Accordingly, the electronic device safety path can only be operatively connected to the sensor unit when interference prevents transmission through the electronic device main path or interferes in other ways. Alternatively, the electronic device main path and the electronic device safety path can be operatively connected to the sensor unit permanently or at least temporarily at the same time, so that the credibility test of the transmitted signal can be realized, or the signal can be transmitted through the electronic device safety path without delay even in the case of failure of the electronic device main path. The operative connection of the electronic device main path and the electronic device safety path involves direct connection and indirect connection of a single path for signal transmission. In addition, the operative connection can also involve the actual activation of a single path or a corresponding signal preparation unit. In other words, at least one of the signal processing units can be permanently physically connected to the sensor unit, for example, wherein the operational connection is strictly speaking only effected upon activation of the respective signal processing unit.

[0010] The operative connectability of the sensor unit to the rotary brake drive can also include direct and indirect connections. The connection can be realized mechanically and / or in terms of signal technology. Thus, the sensor unit can not only be in direct contact but also interact with the rotary brake drive via optical, acoustic and / or electrical or electromagnetic signals to generate at least one signal representing the rotation angle, which can be transmitted to a corresponding signal preparation unit via an electronic device main path and / or an electronic device safety path.

[0011] The embodiment of the rotation angle detection system with sensor units having redundant individual paths can support a reduction in the required installation space in particular by virtue of the fact that the corresponding signal processing units can be implemented by small microelectronic and / or highly integrated components, which themselves have a relatively small space requirement in the redundant embodiment of the individual paths. The redundant embodiment of the individual paths, i.e. the electronic safety paths, with respect to the electronic main paths or the corresponding signal processing units can involve an identical functional embodiment or can also involve a redundancy of predetermined, in particular safety-related functions.

[0012] According to one embodiment, the sensor unit is equipped with a higher failure safety than the at least one electronics main path and / or the at least one electronics safety path. In particular, the sensor unit has a non-fail-safe property with respect to the higher failure safety.

[0013] Therefore, the sensor unit, such as a single sensor element, is implemented in a correspondingly simple, reliable and fail-safe manner to achieve the highest possible failure safety. This can be achieved, for example, by appropriate measures, such as durable mechanical design, enhanced insulation, larger wire cross-sections and / or the use of ageing-resistant materials. In particular, the sensor unit is implemented so that its characteristics are "not lost" over a certain period of use or also over its entire service life. The term "characteristics that will not be lost" in this context relates to unacceptable failures. Since the signal preparation unit or the individual paths connected thereto are implemented at least redundantly with a predetermined functionality, functions with less failure safety can be set to these individual paths. It is precisely in view of the fact that the signal preparation unit with the corresponding components of generally relatively high complexity has a higher probability of failure, which can be at least partially compensated by redundancy.

[0014] According to one configuration, the signal processing unit of the at least one electronics main path and / or the at least one electronics safety path has at least one signal converter.

[0015] By means of the at least one signal converter, for example, a sensor signal transmitted by the sensor unit can be converted into a signal that can be processed by further signal conditioning components. The signal converter can be, for example, an A / D converter that converts an analog signal of the sensor unit into a digital format.

[0016] According to one configuration, the signal preparation unit of the at least one electronic device main path and / or the at least one electronic device safety path has at least one signal processing unit.

[0017] The signal of the sensor unit, which is optionally converted initially by a signal converter, is further processed, for example, by a signal processing unit. In particular, the further processing may be the calculation of another variable and / or another form of signal processing taking into account other signal inputs in order to determine the rotation angle of the rotary brake drive based on the signal of the sensor unit.

[0018] According to one configuration, the signal preparation unit of the at least one electronic device main path and / or the at least one electronic device safety path has at least one signal output unit.

[0019] The signal output unit outputs the rotation angle of the rotary brake drive determined based on the signal of the sensor unit. The signal output unit can be a separate unit of the signal processing unit or can also be integrated in the above-mentioned signal processing unit. Conversely, the signal output unit can also include a signal processing function.

[0020] According to one design solution, the at least one electronic device main path and / or the at least one electronic device safety path has at least one signal switch, and the at least one signal preparation unit can be operatively connected to the at least one sensor unit via the signal switch.

[0021] Thus, by means of such a signal switch, the at least one electronic device main path and / or the at least one electronic device safety path can be selectively connected to the sensor unit and separated again. If a fault in the at least one electronic device main path and / or the at least one electronic device safety path can be transmitted to the sensor unit or may otherwise have an adverse effect on the sensor unit, this is prevented by separating the faulty single path. In addition, a targeted connection to the sensor unit can also be achieved by means of a signal switch. Thus, for example, only a single path can first be connected to the sensor unit, wherein then, when the single path fails accordingly or for other reasons, the other single path is switched on or switched to the single path by means of a signal switch. The term "connection" relates to the connection of two single paths, while the previous single path is disconnected when switching.

[0022] According to one configuration, the at least one electronics main path and / or the at least one electronics safety path has at least one energy supply unit, which is operatively connectable to the at least one sensor unit.

[0023] Therefore, the sensor unit does not necessarily need its own energy supply, but can be supplied with energy via the at least one electronic device main path and / or the at least one electronic device safety path. If the at least one electronic device main path and / or the at least one electronic device safety path has at least one energy supply unit or has corresponding connections connected to the energy supply unit, the failure safety can be further increased.

[0024] According to one design solution, the at least one electronic device main path and / or the at least one electronic device safety path has at least one energy supply switch, and the at least one energy supply unit can be operatively connected to the at least one sensor unit via the energy supply switch.

[0025] Analogously to a signaling switch, a targeted connection and disconnection of the corresponding energy supply units can therefore also be achieved here.

[0026] In particular, the at least one electronics main path and / or the at least one electronics safety path and / or the at least one signaling switch and / or the at least one energy supply switch can be controlled by a control signal of a control unit.

[0027] Such a control unit preferably includes a monitoring function or is at least connected to a corresponding monitoring unit in terms of signal technology, so that in the event of a failure or malfunction of a single path or a signal preparation unit or an energy supply unit, the at least one signal switch and / or the at least one energy supply switch can be controlled by a control signal. The control device can be constructed so that the at least one electronic device main path is controlled first, and the at least one electronic device safety path is controlled only when there is no feedback signal or based on a fault detected in other ways. Correspondingly, the control unit can also control the at least one signal switch and / or the at least one energy supply switch. The control of the at least one signal switch and / or the at least one energy supply switch can also be achieved through the corresponding at least one electronic device main path and / or the at least one electronic device safety path. The control unit can be part of a rotation angle detection system, for example, part of the at least one electronic device main path and / or the at least one electronic device safety path, or it can also be an external control unit.

[0028] According to one configuration, the sensor unit is a resolver or has at least one resolver.

[0029] A rotary transformer is a rotation angle sensor, wherein the rotary angle sensor has a rotor and a stator similar to an electric motor. The rotor of the rotary transformer can be made of a material with good magnetic conductivity and form a magnetic circuit (Rückschluss) for the magnetic field generated by the stator. If the winding in the stator of the rotary transformer is considered, two different areas can be distinguished. The first area corresponds to the rotary converter, wherein the winding is arranged concentrically around the rotor. In the second area, the winding structure corresponds to the structure of the motor winding with two phases, but the two phases are not connected to each other. The two winding areas are separated from each other in space and are only magnetically coupled through the rotor and stator loop. For example, the excitation winding of the rotary transformer is excited by a sinusoidal or rectangular high-frequency voltage, typically in the range of 2kHz to 10kHz. Here, the alternating magnetic field is only transmitted to the measuring winding through the rotor and modulated in terms of its amplitude. The voltage in the measuring winding can be considered as an evaluation parameter. Then the sine oscillation and cosine oscillation are used as output signals. Since the magnetic excitation of the rotor is realized with an AC voltage of constant amplitude, the magnetic excitation induces a voltage in the measuring winding whose amplitude is independent of the rotational speed of the shaft of the brake drive. The amplitude of the voltage in the measuring winding therefore depends only on the rotor angle or the position of the rotor or the shaft.

[0030] Due to its construction, in which no mechanical parts with wear properties, such as ball bearings, and no electronic components, such as microprocessors, semiconductors or capacitors with solid electrolytes, are used, the resolver itself offers a very high degree of failure safety.

[0031] In particular, the at least one electronics main path and / or the at least one electronics safety path has at least one resolver-digital converter.

[0032] By using at least one resolver digital converter, the resolver can be operated as a sensor unit in a simple manner. Since the resolver digital converter is an electronic component similar to a microprocessor, which has a complex structure and / or has a low failure safety, at least one resolver digital converter is arranged both in the at least one electronic device main path and in the at least one electronic device safety path.

[0033] According to one embodiment, the at least one resolver-digital converter is designed to magnetically excite the rotor of the resolver, in particular with an AC voltage having a constant amplitude, and to receive sine and cosine signals of the stator of the resolver.

[0034] Therefore, according to the working mode of the resolver listed above, the control signal or excitation signal for the resolver can be transmitted by the resolver digital converter, and conversely, the resolver receives an output signal representing the rotation angle. Correspondingly, the at least one resolver digital converter can be designed to generate a suitable excitation signal for the resolver. In addition, the at least one resolver digital converter can be designed to not only receive but also further process the two output signals of the resolver, namely the sine signal and the cosine signal, and forward the rotation angle of the rotary brake drive or the output signal representing the rotation angle as a measured variable to a superordinate system, for example, via a digital interface.

[0035] According to one embodiment, the at least one resolver-to-digital converter or another signal processing unit is designed to determine the rotational angle position from sine and cosine signals of a stator of the resolver, in particular taking into account the number of pole pairs of the resolver.

[0036] The resolver signals, i.e. the sine and cosine signals, are evaluated, for example, by forming an inverse tangent, whereby the electrical rotational angle position can be output. By taking into account the number of pole pairs of the resolver, an output as a mechanical rotational angle position is also possible. Furthermore, the use of the two output signals and trigonometric calculations enables a diagnosis of the resolver.

[0037] According to another aspect, the invention relates to a brake 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 as described above.

[0038] The features described above in the description of the rotation angle detection system also relate to advantageous embodiments of the brake system according to the invention, and vice versa.

[0039] According to a further aspect, the invention relates to a rail vehicle having at least one rotation angle detection system as described above and / or an above braking system, wherein at least the sensor unit is arranged in a bogie of the rail vehicle.

[0040] The features described above in the description of the rotation angle detection system also relate to advantageous embodiments of the rail vehicle according to the invention, and vice versa.

[0041] The embodiments of the present invention described above and below should not be considered as limiting the subject matter of the present invention. Instead, other subjects according to the present invention can be obtained by supplementing, omitting or replacing individual features. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0043] Shown in detail:

[0044] Figure 1 A schematic diagram showing a rotation angle detection system for a rail vehicle according to an exemplary first embodiment; and

[0045] Figure 2 A schematic diagram of a rotation angle detection system for a rail vehicle according to an exemplary second embodiment is shown. DETAILED DESCRIPTION

[0046] Figure 1 A schematic diagram of a rotation angle detection system 1 for a rail vehicle according to a first exemplary embodiment is shown. The rotation angle detection system 1 has a sensor unit 30 which can detect the rotation angle of a rotary brake drive (not shown) of the rail vehicle. For this purpose, the rotation angle detection system is arranged in the bogie, for example in an electromechanical brake caliper which is arranged in the 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 also in the bogie.

[0047] In addition, the rotation angle detection system 1 has an electronic device main path 10 and an electronic device safety path 20, which are connected to the sensor unit 30 as a single path. The electronic device main path 10 and the electronic device safety path 20 each have a signal converter 14, 24, a signal processing unit 15, 25 and a signal output unit 16, 26 as part of the signal preparation unit, which is composed of these parts and prepares the sensor signal of the sensor unit. In addition, the electronic device main path 10 and the electronic device safety path 20 each have an energy supply unit 11, 21 so that the sensor unit can be supplied with energy. The connection of the sensor unit 30 to the energy supply performed by the corresponding energy supply unit 11, 21 is realized by the corresponding energy supply switch 12, 22. Similarly, the connection of the sensor unit to the signal preparation is realized by the corresponding signal switch 13, 23 through the corresponding signal converter 14, 24, the corresponding signal processing unit 15, 25 and the corresponding signal output unit 16, 26. The signaling switches 13, 23 and the energy supply switches 12, 22 are controlled by corresponding control signals 17, 27 provided by the control unit 40. Here, the control signal 17 is used to control the signaling switch 13 and the energy supply switch 12 of the electronic device main path 10, while the signaling switch 23 and the energy supply switch 22 of the electronic device safety path 20 are controlled by the control signal 27. If the rotation angle detection and energy supply are carried out, for example, by the electronic device main path and a fault or failure is detected during the implementation, the control unit 40 outputs the control signal 17 to open the signaling switch 13 and the energy supply switch 12 and thus cut off the corresponding connection with the sensor unit 30. In addition, the control unit 40 outputs the control signal 27 to the electronic device safety path 20 in connection with this to close the signaling switch 23 and the energy supply switch 22, so that the sensor unit 30 is connected to the electronic device safety path 20. As long as the failure or fault only involves the energy supply, it is also possible to switch only the corresponding energy supply switch 12, 22. Similarly, when the corresponding activated energy supply unit 11, 21 is not involved in a fault or failure, only the signaling switch 13, 23 can be switched.

[0048] The main electronic path 10 and the safety electronic path 20 have the same functional scope in this case, so as to achieve complete redundancy of the main electronic path 10 and the safety electronic path 20. However, in an alternative embodiment, the main electronic path 10 and the safety electronic path 20 may also have only partially the same functional scope, so as to, for example, redundantly construct only safety-related functions.

[0049] According to the above-described embodiment, the rotation angle detection system 1 therefore does not have a redundant sensor unit with a corresponding electronic device path for signal preparation, but rather the redundancy is transferred to the signal preparation via a single line constructed at least partially redundantly by an electronic device main path 10 and an electronic device safety path 20, which can be connected to the sensor units 30 implemented non-redundantly in each case.

[0050] Figure 2A schematic diagram of a rotation angle detection system 1' for a rail vehicle according to an exemplary second embodiment is shown. 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 constituted by a rotary transformer 30'. In addition, in the rotation angle detection system 1', energy supply in the form of an excitation signal for the rotary transformer 30' and signal preparation are implemented in the electronic device main path 10' and the electronic device safety path 20' respectively connected to the rotary transformer 30' according to the sine signal and the cosine signal received by the rotary transformer 30' through the rotary transformer digital converters 18 and 28 respectively arranged in the electronic device main path 10' and the electronic device safety path 20'. The excitation signal can be transmitted to the rotary transformer 30' from the rotary transformer digital converter 18 in the electronic device main path 10' or from the rotary transformer digital converter 28 in the electronic device safety path 20' according to the circuit of the corresponding excitation signal switch 13a', 23a'. Corresponding to the excitation signal and combined with the current rotation angle of the rotary brake drive, the rotary transformer 30' outputs a sine signal and a cosine signal. The sine signal is selectively transmitted 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', depending on the switch position of the sine signal switches 13b', 23b' arranged both in the main electronic path 10' and in the safety electronic path 20'. In an alternative embodiment, it can also be provided, for example for control reasons, that the sine signal is transmitted both to the resolver digital converter 18 in the main electronic path 10' and to the resolver digital converter 28 in the safety electronic path 20'. Similar to the transmission of the sine signal, the cosine signal is selectively transmitted 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', depending on the switch position of the cosine signal switches 13c', 23c' arranged both in the main electronic path 10' and in the safety electronic path 20'. In alternative specific embodiments, for example also for control reasons, provision may be made for the cosine signal to be transmitted not only to resolver digital converter 18 in electronics main path 10 ′ or to resolver digital converter 28 in electronics safety path 20 ′.

[0051] Respective resolver digital converters 18 , 28 are each designed such that resolver digital converters 18 , 28 determine the rotation angle of the rotary brake drive from the transmitted sine and cosine signals by forming an arc tangent and output it to a higher-level control unit, such as control unit 40 .

[0052] Reference numerals list

[0053] 1. 1'Rotation angle detection system

[0054] 10, 10' electronic device main path

[0055] 11 Energy supply unit (main path of electronic device)

[0056] 12 Energy supply switch (main path of electronic device)

[0057] 13 signal switch (main path of electronic device)

[0058] 13a' Excitation signal switch (main path of electronic device)

[0059] 13b' Sinusoidal signal switch (main path of the electronics)

[0060] 13c' Cosine signal switch (main path of the electronics)

[0061] 14Signal converter (main path of electronic device)

[0062] 15Signal processing unit (main path of electronic device)

[0063] 16 signal output units (main path of electronic device)

[0064] 17 Control signal (main path of electronic device)

[0065] 18Resolver digital converter (main path of electronics)

[0066] 20, 20' Electronic Device Safety Path

[0067] 21 Energy supply unit (electronic device safety path)

[0068] 22 Energy supply switch (electronic device safety path)

[0069] 23 signal switch (electronic device safety path)

[0070] 23a' Actuation signal switch (electronic device safety path)

[0071] 23b' Sinusoidal signal switch (electronic device safety path)

[0072] 23c' Cosine signal switch (electronic device safety path)

[0073] 24 signal switch (electronic device safety path)

[0074] 25Signal processing unit (electronic device safety path)

[0075] 26 signal output unit (electronic device safety path)

[0076] 27 Control signal (electronic device safety path)

[0077] 28Resolver digital converter (electronics safety path)

[0078] 30 sensor units

[0079] 30' Rotary Transformer

[0080] 40 control unit

Claims

1. A rotation angle detection system (1, 1') for detecting the rotation angle of a rotary brake drive of a rail vehicle, the rotation angle detection system comprising: at least one sensor unit (30, 30') for detecting the rotation angle, said sensor unit being operatively connectable to said rotary brake actuator, and For each sensor unit (30, 30'), at least one electronic device main path (10, 10') and at least one electronic device safety path (20, 20') are provided, wherein the at least one electronic device main path (10, 10') and the at least one electronic device safety path (20, 20') are respectively operatively connectable to the at least one sensor unit (30, 30') as a single path, in, The at least one electronic device main path (10, 10') and the at least one electronic device safety path (20, 20') each have at least one signal preparation unit (14, 15, 16, 18, 24, 25, 16, 28).

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

3. The 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') has at least one signal converter (14, 18, 24, 28).

4. The rotation angle detection system (1, 1') according to any one of the preceding claims, wherein: The signal preparation 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. The rotation angle detection system (1, 1') according to any one of the preceding claims, wherein: The signal preparation unit of the at least one electronic device main path (10, 10') and / or the at least one electronic device safety path (20, 20') has at least one signal output unit (16, 18, 26, 28).

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

7. The rotation angle detection system (1, 1') according to any one of the preceding claims, wherein: The at least one electronic device main path (10, 10') and / or the at least one electronic device safety path (20, 20') has at least one energy supply unit (11, 21), which can be operatively connected to the at least one sensor unit (30, 30').

8. The rotation angle detection system (1, 1') according to any one of the preceding claims, wherein: The at least one electronic device main path (10, 10') and / or the at least one electronic device safety path (20, 20') has at least one energy supply switch (12, 22), and the at least one energy supply unit (11, 21) can be operatively connected to the at least one sensor unit (30, 30') via the energy supply switch.

9. The rotation angle detection system (1, 1') according to claim 6 or 8, wherein: The at least one electronic device main path (10, 10') and / or the at least one electronic device safety path (20, 20') and / or the at least one signaling switch (13, 13a', 13b', 13c', 23, 23a', 23b', 23c') and / or the at least one energy supply switch (12, 22) can be controlled by a control signal (17, 27) of a control unit (18, 40).

10. The rotation angle detection system (1') according to any one of the preceding claims, wherein: The sensor unit (30') is a rotary transformer (30') or has at least one rotary transformer (30').

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

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

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

14. A braking system for a rail vehicle, the braking system 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 any one of claims 1 to 13.

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

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