ELECTRIC MOTOR AND RAIL VEHICLE

Abstract

An electric motor for a rail vehicle has a rotational speed sensor. The rotational speed sensor is mounted to an end shield of the electric motor. A sensor wheel for the rotational speed sensor is mounted to a clutch of the electric motor.

Claims

1-11. (canceled)

12. An electric motor for a rail vehicle, the electric motor comprising: an end shield; a coupling; a rotational speed sensor mounted to said end shield; and a sensor wheel for said rotational speed sensor, said sensor wheel being mounted on said coupling.

13. The electric motor according to claim 12, wherein said end shield is a drive-side end shield of the electric motor.

14. The electric motor according to claim 12, wherein said rotational speed sensor is fastened to a threaded blind hole of said end shield.

15. The electric motor according to claim 12, wherein said rotational speed sensor is one of a plurality of rotational speed sensors mounted on said end shield.

16. The electric motor according to claim 15, wherein each of said plurality of rotational speed sensors is fastened to a threaded blind hole formed in said end shield.

17. The electric motor according to claim 12, wherein said sensor wheel has at least 150 teeth.

18. The electric motor according to claim 12, wherein the electric motor is a water-cooled motor.

19. The electric motor according to claim 12, wherein the electric motor has an output of at least 500 kW.

20. The electric motor according to claim 12, wherein the electric motor has a torque of at least 9000 Nm.

21. A rail vehicle, comprising at least one electric motor according to claim 12.

22. The rail vehicle according to claim 21, wherein the rail vehicle is a high-speed train having a maximum speed of at least 200 km/h.

Description

[0021] In the figures:

[0022] FIG. 1 shows a diagrammatic perspective view of an electric motor according to an exemplary embodiment,

[0023] FIG. 2 shows a diagrammatic representation of a sectional view through part of the electric motor according to FIG. 1,

[0024] FIG. 3 shows a diagrammatic perspective view of the end shield in an exemplary embodiment of the electric motor, and

[0025] FIG. 4 shows a diagrammatic representation of a rail vehicle with the electric motor.

[0026] Identical or identically acting components are each provided with the same reference characters in the figures. The components shown and the ratios of the components to one another are not to be regarded as true to scale.

[0027] FIGS. 1 and 2 show an exemplary embodiment of the electric motor 1 for a rail vehicle in a perspective view and a sectional view. The electric motor 1 has a housing which is closed off on a drive side by an end shield 2. On the drive side, the electric motor 1 is connected to a wheelset shaft 9 of the rail vehicle by means of a coupling 4. The coupling 4 can in particular be a curved-tooth coupling.

[0028] The coupling 4 is used in particular to connect a rotor shaft 11 of the electric motor 1 to the wheelset shaft 9. In the present example, the coupling 4 is designed in several parts. The coupling 4 has a wheelset-side part 4a which is connected to the wheelset shaft 9. Furthermore, the coupling 4 has a motor-side part 4b which is connected to a rotor shaft 11 of the electric motor 1. A central part 4c of the coupling 4 is arranged between the motor-side part 4b and the wheelset-side part 4a. In the present example, the coupling 4 is a gearless coupling.

[0029] Alternatively, it is possible for a gear to be arranged between the rotor shaft 11 and the wheelset shaft. In this case, the coupling is located between the motor and the gear.

[0030] In order to determine the rotational speed, the electric motor 1 has one or more rotational speed sensors 3. The at least one rotational speed sensor 3 is configured to scan the toothing of a sensor wheel 5 which is attached to the coupling 4. The sensor wheel 5 is preferably scanned inductively by the rotational speed sensor 3.

[0031] Alternatively, it would be possible for the rotational speed sensor 3 to optically scan the sensor wheel 5.

[0032] In particular, the sensor wheel 5 is arranged on the motor-side part 4b of the coupling 4, the motor-side part 4b of the coupling rotating with the rotor shaft 11. The rotary movement of the motor-side part 4b of the coupling therefore corresponds to the rotary movement of the rotor shaft 11. Scanning the toothing of the sensor wheel 5 makes it possible to determine the rotational speed and/or the angular position of the rotor or variables which can be derived therefrom. The toothing which forms the sensor wheel 5 is arranged in particular on an outer circumference of the motor-side part 4b of the coupling 4.

[0033] As can be seen in FIG. 1, the electric motor 1 can have a plurality of rotational speed sensors 3, for example four rotational speed sensors 3. The rotational speed sensors 3 can have various functions, for example they can be provided for drive control, for brake control or for standstill detection.

[0034] The arrangement of the sensor wheel on the coupling 4 has the advantage that no additional installation space is required for the sensor wheel 5 in the axial direction, i.e. in the direction of the rotor shaft and the wheelset shaft 9. The electric motor 1 is thus designed in a particularly space-saving manner.

[0035] In particular, the electric motor 1 can be a water-cooled motor which does not have a fan. The arrangement of the sensor wheel 5 on the coupling 4 is particularly advantageous in this case as there is no possibility of arranging the sensor wheel 5 on a fan.

[0036] The toothing of the sensor wheel 5 can be, for example, a rectangular toothing or an involute toothing. The module of the toothing is preferably at least 1.5 mm. In order to achieve a good resolution when determining the rotational speed and/or angular position of the rotor, the sensor wheel 5 preferably has at least 150, at least 200 or even at least 300 teeth.

[0037] The at least one rotational speed sensor 3 is mounted on an outer side of the drive-side end shield 2. For example, the rotational speed sensor 3 is mounted on the end shield 2 by means of an adapter 6 which is screwed into a threaded blind hole in the end shield 2. Alternatively, the rotational speed sensor can be screwed directly onto the end shield. The arrangement of the at least one rotational speed sensor 3 on an outer side of the end shield 2 has the particular advantage that the rotational speed sensor 3 is protected from high temperatures inside the motor housing. In addition, the rotational speed sensor is well protected from stone impact in the installation position on top of the end shield. In this way, a reliable and material-saving operation of the rotational speed sensor 3 is made possible. The electric motor 1 can in particular be a high-performance motor which has, for example, a torque of at least 9000 Nm and/or an output of at least 500 kW.

[0038] FIG. 3 shows a perspective view of the end shield 2 in an exemplary embodiment of the electric motor 1.

[0039] The end shield 2 has mounting surfaces 7 for one or more rotational speed sensors. The mounting surfaces 7 can each have threaded blind holes 8 into which, for example, adapters can be screwed which can receive the rotational speed sensors. The plurality of threaded blind holes 8 can be advantageously produced in a single machine setup. Attaching the rotational speed sensor to threaded blind holes 8 in the end shield 2 has the advantage that no through bores are required in the end shield 2.

[0040] The electric motor 1 is provided in particular for driving a rail vehicle. FIG. 4 shows a diagrammatic representation of a rail vehicle 10. The rail vehicle 10 can have one or preferably a plurality of electric motors 1, each of which has one of the embodiments described above. The rail vehicle 10 is in particular a train in which the electric motor 1 described herein is installed in one or more carriages of the train. In particular, the rail vehicle 10 can be a high-speed train which, for example, has a maximum speed of at least 200 km/h or even at least 300 km/h.

[0041] Although the invention has been illustrated and described in detail with reference to exemplary embodiments, the invention is not limited to the disclosed exemplary embodiments and the specific combinations of features explained therein. Further variations of the invention can be obtained by a person skilled in the art without departing from the scope of the claimed invention.

LIST OF REFERENCE CHARACTERS

[0042] 1 Electric motor [0043] 2 End shield [0044] 3 Rotational speed sensor [0045] 4 Coupling [0046] 4a Wheelset-side part of the coupling [0047] 4b Motor-side part of the coupling [0048] 4c Central part of the coupling [0049] 5 Sensor wheel [0050] 6 Adapter for rotational speed sensor mounting [0051] 7 Mounting surface [0052] 8 Threaded blind holes [0053] 9 Wheelset shaft [0054] 10 Rail vehicle [0055] 11 Rotor shaft