Abstract: A method for welding two opaque elements of polymer material stable at high temperatures including the following steps: preparing a lower element of opaque polymer material which is stable at high temperatures and to which is added a carbon powder in such a manner that the lower element is capable of absorbing laser radiation, preparing an upper element of polymer material which is stable at high temperatures, laser-welding the lower element and the upper element by laser radiation passing through the upper element and bringing about the welding at the interface between the upper element and the lower element. The upper element is made, during its preparation, opaque with respect to visible radiation and transparent with respect to laser radiation by adding a pigment to the polymer material, the pigment which is of the mineral or organic type not modifying the properties of the polymer material, being transparent with respect to laser radiation and stable at high temperatures.

Abstract: An oil cooling system, which may be employed for transformers feeding traction electric motors and for oil in a high viscosity condition, includes a first heat exchanger between a heat generating source to cooling oil that is connected by delivery and return ducts to a second heat exchanger cooling the oil by transmitting the heat absorbed at the first heat exchanger to an environment having a lower temperature than the cooling oil. The oil cooling system also includes devices flowing the cooling oil from the first to the second heat exchanger and vice versa, and devices monitoring oil flow in the circuit, for example by indicating operating conditions of the cooling system and/or by performing safety operations when the heat generating source becomes overheated.

Abstract: This device is an electric safety brake which is intended for an electric traction vehicle, in particular a rail vehicle comprising: a rotating electromechanical machine (10) having permanent magnets having at least one coil with electric terminals (13, 14, 15), a resistive braking torque production device (22), an electromechanical commutator (20) which is capable of reliably connecting the electric terminals (13, 14, 15) of the machine (10) to the braking torque production device (22).

Abstract: A device is provided for detecting inadequate electric braking and commutation to a safety brake is intended for a vehicle with electric traction, in particular a rail vehicle, which is provided with a traction chain, the system including a first electric, non-safety brake which is integrated in the traction chain and a second safety brake. The device includes a member for commutation from the first brake to the second brake, a device for monitoring the braking performance of the first brake using data for measurement of the intensity of a current, a decision device for commutating from the first brake to the second brake when a predetermined threshold value is exceeded and a device for transmitting a commutation command to the at least one commutation member.

Abstract: The invention relates to a communication bellows, of the type comprising: at least one external skin (22) which has a succession of inwardly directed undulations (56); at least one internal skin (24) which has a succession of outwardly directed undulations (58) which are provided facing the inwardly directed undulations (56) of the external skin (22), the two skins (20, 22) together delimiting an acoustic insulation space (25), the internal skin (24) being connected to at least some of the inwardly directed undulations (56) of the external skin (22), wherein the external skin (22) and internal skin (24) are connected to each other only by some mutually facing undulations (56, 58), other undulations (56, 58) of the two skins (22, 24) remaining separate from each other.

Abstract: Switching device (D) disposed on an electrically powered vehicle, able to switch, by rectilinear displacement of a contact means (52) by means of a drive means (60), indiscriminately in the two directions, between a first state in which the said contact means (52) establishes an electrical connection between a first individual terminal (I1) and a common terminal (Co) and a second state in which the said contact means (52) establishes an electrical connection between a second individual terminal (I2) and the said common terminal (Co), the said switching device (D) being characterised in that the said individual terminals (I1, I2), the said common terminal (Co) and the said contact means (52) are disposed within one single insulator (14).

Abstract: This system for measuring an electromagnetic field radiated by an electrical component of an electronic circuit, the electrical component being fixed to a dielectric substrate of the electronic circuit, is wherein a transducer (90 to 95) is etched on the substrate of the electronic circuit.

Abstract: Apparatus for measuring the electrical energy supplied to a rail traction unit by a high voltage line (1), the apparatus comprising measurement means (5, 26) for measuring the current drawn, and measurement means (12, 27) for measuring the voltage of the power supply, said measurement means themselves possessing a low voltage power supply (23, 24) necessary to enable them to operate, the apparatus being characterized in that the low voltage electrical power supply is taken from light energy converted (22) into electrical energy.

Abstract: The present invention relates to a power semiconductor device comprising a switching power semiconductor element, and a free wheeling diode in anti-parallel connection to the switching power semiconductor element. The power semiconductor is characterized in that a reverse electrode of the switching power semiconductor element and a reverse electrode of the free wheeling diode are bonded and mounted on a circuit pattern formed on the main surface of the first substrate, and that a circuit pattern, which is so formed on the main surface of the second substrate as to oppose a surface electrode of the switching power semiconductor element and a surface electrode of the free wheeling diode, is connected to the surface electrodes of the switching power semiconductor element and the free wheeling diode through connective conductors to be soldered, respectively.

Abstract: A rail vehicle of the type comprising including at least one equipped axle which is provided with a transmission shaft which is movable in terms of rotation and which is fixedly joined in terms of rotation to two wheels, each of which is provided with a tire, the device including an electric current supply source, the source supplying a friction assembly with electric current. The friction assembly is alone and is electrically connected to a cable assembly which electrically connects the tires of the two wheels, the cable assembly including a cable portion which extends inside the transmission shaft between the two wheels.

Abstract: Railway vehicle (1) comprising an access platform (4) which extends between two lateral faces (3), at least one of the faces comprising a lateral access door (2), the access platform (4) being adjacent to at least one passenger area (6, 6?) and comprising a plate (5) which is movable vertically so as to allow passengers with reduced mobility to access/leave the access platform (4) from/to a railway platform (27) of height Qi (i=0, 1, 2, . . . , n) when said movable plate (5) is placed in an embarkation/disembarkation position Ei (i=0, 1, 2, . . . , n), characterized in that said vehicle (1) comprises at least one means of passage (11, 11?) allowing persons with reduced mobility to move between said passenger area (6, 6?) and said movable plate (5) whatever the embarkation/disembarkation position Ei (i=0, 1, 2, . . . , n) thereof.

Abstract: This electric safety braking device for an electric traction vehicle may allow the force/speed characteristic of the vehicle to be improved and includes a rotating electromechanical machine with permanent magnets which has at least one coil with electric terminals, a rheostatic electric braking torque production device, and a commutation device which are capable of connecting the electric terminals of the electromechanical machine to the braking torque production device. The electric safety braking device includes at least one inductor is connected in series between the braking torque production device and the electromechanical machine.

Abstract: The system comprises a first data store which comprises a first physical storage medium, in which occurrences of information are recorded, and a second data store which comprises a second physical storage medium, in which occurrences of information are recorded. The system further comprises, for each item of information from a set of information, of which a first occurrence is recorded in the first physical storage medium and a second occurrence is recorded in the second physical storage medium, an item of software for monitoring the first occurrence of the information, and an item of software for modification of the second occurrence of the information.

Abstract: The invention provides a transport unit including at least one passenger transport vehicle and at least one attached driver vehicle; a set of networks including a train bus, first and second gateways, first and second vehicle buses each connected to the train bus via the first and second gateways respectively, and first and second on-board equipment groups connected solely to the first and second gateways. The transport unit includes at least two vehicles each having at least one piece of equipment in the first equipment group and at least one piece of equipment in the second equipment group.

Abstract: One of the aspects of the present invention is to provide a power semiconductor device, including a first substrate having a first circuit pattern formed thereon, and a second substrate having a second circuit pattern formed thereon. The first substrate has a first center line extending along a predetermined transverse direction. At least one power semiconductor chip is mounted on the first circuit pattern of the first substrate, and has at least one chip electrode opposing to the second circuit pattern of the second substrate. Also, a plurality of first conductive connectors on the first circuit pattern is provided for electrical connection with the second circuit pattern of the second substrate. The first conductive connectors are arranged symmetrically in relative to the first center line of the first substrate.

Abstract: A method for supplying electrical power to a DC supply bus of a rotating electric motor of an electric vehicle is provided. The method includes the steps of selectively supplying electrical power to the bus via a first power supply at a first alternating voltage and selectively supplying electrical power to the bus via a second power supply at a second alternating voltage that is less than the first alternating voltage.

Abstract: A cab of this type comprises a frame (3) defining an internal volume (3a), the frame (3) having at least one upper opening (3b) for receiving panes of glass of said cab, said cab being wherein it comprises a canopy (2) forming an assembly in a single piece which is attached to the frame (3) so as to cover the upper opening (3b) and enclose the internal volume (3a), said canopy comprising a support frame (10) provided with side rails (11) defining at least two openings therebetween and at least two panes of glass (4, 5, 6) filling each opening respectively.

Abstract: This vehicle comprises a body and a levitation device, the body bearing in operation on the levitation device which comprises a first levitation module and a second levitation module connected to the body, and capable of moving to allow the modules to turn relative to the body. The vehicle comprises means for synchronizing movement of the levitation modules comprising a first hydraulic ram between the first module and the body, a second hydraulic ram between the second module and the body, and a fluid-flow circuit connecting the first and second rams to synchronize the actions of the rams. Application to magnetic levitation rail vehicles, for example.

Abstract: This deadbeat control method for regulating an output voltage Uc or an output current Il of a low-pass RLC filter includes: calculation (92) of a current setting ?uc for the average intensity ?u of a DC current Iu flowing through a first output point of the filter between instants ti and ti+1, this setting ?uc being established from discretized state equations of the filter in such a way that the voltage Uc or the line current Il is equal to a predetermined setting of voltage Ucc or of line current Ilc at the instant ti+1, control (100) of an electric converter in order to produce a current Iu flowing through the filter, the average intensity ?u of which between the instants ti and ti+1 is equal to the current setting ?uc.