Lightweight technology of car body One of the important technologies of high-speed trains is lightweight. When the train is running, it consumes about 1 2 kw of energy per1ton weight. When the speed reaches 300 kilometers per hour, it consumes about 1 6 ~17 kw of energy per1ton of weight. The car body of EMU is coated with aluminum alloy, and its weight is much lower than that of steel. It is beneficial to reduce the weight and speed of railway trains, reduce the impact on line facilities, including tracks, turnouts and bridges, and provide good air tightness.
The so-called bogie of high-speed bogie technology is the control integration of two sets of wheelsets, which is the most important running part of railway vehicles. It directly bears the weight of the car body, ensuring that the EMU runs at a speed of more than 200 kilometers per hour and has a good stable state, ensuring the comfort and safety of passengers. In addition, it also has good curve passing ability. At present, the bogie technology of EMU can guarantee the maximum speed of 350 kilometers per hour.
Traction power supply technology is the core technology of high-speed trains in the world, including traction motor, traction transformer, traction converter and traction control system.
Traction control system This system controls the link from catenary and pantograph to traction motor and track.
The current of 25 kV and 50 Hz provided by AC catenary of traction transformer is converted into AC required by traction converter input through traction transformer.
Traction converter rectifier, intermediate DC circuit and inverter constitute a traction converter for AC -DC- AC conversion. The rectifier converts the single-phase alternating current input from the secondary side of the traction transformer into DC, the intermediate DC circuit provides a stable DC power supply for the inverter, and the inverter inverts the intermediate DC into three-phase alternating current with adjustable frequency and voltage required by the traction motor.
Traction Motor Three-phase AC drives a single traction motor with power greater than 300 kW. It can change the traction and speed of the EMU at any time according to the change of the amplitude and frequency of alternating current, and drive the wheels to rotate at high speed through the gearbox. In addition, when the train brakes, the traction motor becomes the running state of the generator, which can convert the kinetic energy of the train into electric energy and achieve the effect of deceleration.
Train network control technology In EMU, the facilities that provide a large number of services for passengers depend on computer control. The whole train implements two-level network, monitors all facilities and equipment of the whole train, and communicates with the ground to realize the ground monitoring of EMU. In addition, the EMU also has self-diagnosis function.