permanent magnet synchronous traction motors controlled by a new type of inverter. The combination test results of the system in the factory showed the entire train could reach 300km/h in 233 seconds, an improvement of about 120 seconds compared with KTX and KTX-Sancheon. The primary objective of the Hemu430X
project is to verify the performance of the distributed traction system for high-speed operation. Korean high-speed lines have relatively short distances between stations due to the high population of the cities served. This demands high rates of acceleration and deceleration from the propulsion system coupled with high adhesion to improve the average speed.
Optimised car body Other objectives of the research project
are to verify the environmental performance of the train. The car body has been optimised by using a lightweight cross-section. This was achieved by modifying the cross-section of the double- skinned panel structures, which reduces the axleload. However, the motored cars fitted with the distributed traction system still have shortcomings which need to be improved. The noise from both the traction system and the bogie need to be isolated effectively. Research focused on the insulation and isolation of the passenger compartment from the noise generated by the main transformer, power semiconductor switching and main circuit breaker switching. The noise emitted by the bogies on trains with distributed traction is higher than that produced by an articulated bogie, which is located under both ends of the carbody and does not have any traction motors. To address these issues, effective noise insulation technologies are being examined for the interior design.
Nevertheless, the advances achieved with the design of Hemu430X have made it possible to add more seats in each coach to meet customer demand. Pantographs are fitted to the M1 and M2 cars, while the main transformers are installed under the floor of the M1 and M4 cars. The auxiliary power supply and static inverters are fitted beneath the floor of the driving trailer car and motored driving car. The designer, Professor S R Kim, says the key words for developing Hemu430X are motion, pulse, flow and sensitivity to apply a genetic algorithm method with pragmatic, analogue and canonic design philosophies which are the basic design concept of the train. The interior improvements of the passenger compartments were examined based on
IRJ September 2012
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