Alstom Transport Sa

Gec Alsthom Sa

Thierry Jobard

Eric Bonin

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.

Electric safety braking device with permanent magnet motor and breaking torque control

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.

Safety device for detecting inadequate electric braking and commutation to a safety brake

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 () having permanent magnets having at least one coil with electric terminals (), a resistive braking torque production device (), an electromechanical commutator () which is capable of reliably connecting the electric terminals () of the machine () to the braking torque production device (). It is characterized in that the braking torque production device () comprises, on the one hand, a bipolar assembly () of at least one dissipative resistor, the assembly having two single connection terminals and forming a common terminal bipolar electric output load for all the terminals () of the mechanism and, on the other hand, means () for converting the currents from all the terminals () into a single current which is supplied to the two single terminals of the assembly of at least one dissipative resistor, the conversion means () having no active power switches.

Rheostatic safety braking device having a bipolar resistive assembly with permanent magnet motor

A method of preventing wheel spin or wheel locking on an electric traction vehicle whose traction transmission includes servo controlling of one or more control parameters of the motor(s) of the traction transmission to an input reference value. The method is such that the control parameter(s) obtained at the output from the servo control are permanently limited by ideal values for the control parameter(s), which ideal values are such as to make it possible to obtain an input reference value for the speed of rotation of the motor(s) equal to the real travel speed of the vehicle, referred to as the reference speed, in such a manner as to stabilize the torque transmitted by the motor(s) in the event of wheel spin or wheel locking.

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Lyons, France

Thierry Jobard