CR450 EMU prototype for the first time to for permanent magnet motor

China Railway Group Co., LTD. (hereinafter referred to as "China Railway Group") recently announced that the EMU train prototype of the CR450 technology innovation project led by it will roll off the production line within this year.

In terms of core components, CRRC said the CR450 EMU prototype traction system uses a permanent magnet motor, which is the first time a permanent magnet motor has been used on China's commercially operated high-speed trains. In the working state, the permanent magnet motor is charged at more than two kV, at 100 revolutions per second, and the power is increased by 14.5%.

Traction motor is one of the nine key technologies of high-speed EMU, and it is also the "heart" of CR450 high-speed EMU. CRRC officials told China Business News that the permanent magnet motor parts are provided by CRRC Yongji Motor Co., Ltd. and CRRC Zhuzhou Motor Co., Ltd.

In fact, before the CR450 prototype train, the new Fuxing high-speed integrated inspection train has already used the permanent magnet traction system. Railway group of the China business news reporter said, specifically for CR450 science and technology innovation engineering early test of Renaissance high-speed comprehensive detection train, adopted the eddy current braking, including permanent magnet traction system, carbon ceramic plate, active control by pantograph nine new technology, all these new technologies for China's independent research and development.

The person said that the traction motor suitable for high-speed comprehensive inspection train has a continuous operation efficiency of more than 95%, power density of more than 0.9kW / kg, a motor can maintain 750kW operation for a long time, to meet the long section of 400 kilometers per hour.

At the same time, the traction motor is equipped with a variety of sensors, the above people, for example, such as the new vibration monitoring sensor, can monitor the temperature of the Fuxing high-speed comprehensive detection of the train operation, to ensure the safety and reliability of the traction motor. China Railway Group told reporters that the individual parameters of the permanent magnet motor suitable for the CR450 EMU prototype vehicle will also be higher than the Fuxing high-speed comprehensive testing vehicle.

The CR450 science and technology innovation project mainly includes the CR450 emU and 400 kilometers per hour of high-speed rail lines, Bridges, tunnels and other infrastructure technology innovation; Since launched in 2021, has completed the 17 new technology components prototype, carrying CR400 comprehensive test train 57 research test, created the emu Ming line single speed of 453 km, relative rendezvous 891 km and tunnel intersection 840 km new record (see China business network reported on July 1,2023, the CR450 emu run out of the 453 km / h new record stage achievements ").

As for the permanent magnet traction system, Sun Yongcai, a member of the CPPCC National Committee and chairman of CRRC, brought the proposal of "Promoting the Comprehensive Green Transformation of Urban Rail Transit Equipment" at the national two sessions in 2024. Sun Yongcai said in the proposal, currently led by China, joint related scientific research institutes and industrial chain enterprises, realize the new technology, permanent magnet traction system has high efficiency and energy saving, green environmental protection, high reliability, has the basis of large-scale application promotion (see China business network reported on March 4, the two sessions recommendations | the CPPCC national committee Sun Yongcai: using permanent magnet traction new technology such as national city rail years can reduce energy consumption in nearly a quarter ").

China said, according to the design requirements, CR450 emu in 50 km at the same time, noise and energy consumption and environmental indicators are not more than CR400 Renaissance train, so CR450 emu adopted a large number of carbon fiber composite materials, the material compared with traditional material density is lower, with lightweight, high strength, high temperature resistance, fatigue resistance and a series of technical indicators, is advantageous to the vehicle weight reduction, speed and reduce energy consumption.

According to the data provided by China Railway Group, the weight of CR450 is about 10 tons, which is about 12% less than the existing CR400 Fuxing train; the running resistance and energy consumption are reduced by 20%; the braking performance and traction efficiency increase by 20% and 3% respectively, which increases the operating speed by 50 km to 400 km with the braking distance, noise and 400 km of energy consumption per hour.

Significant progress has been made in the construction of the 400 km / h railway infrastructure technology innovation and the higher speed comprehensive test section, the national railway group said. CR450 EMU has completed the top-level target and overall plan formulation, and entered the construction design and prototype development stage.

Although the CR450 emU prototype is just off the production line, there is no timetable for the commercial operation of the CR450 emU. China Railway Group told China Business News that the CR450 test will be carried out after the prototype train goes off the production line, and the test progress will depend according to the test situation."It is too early to talk about business operations."He said.

In January 2021, China Railway Group announced to organize the implementation of Fuxing "CR450 Science and Technology Innovation Project" to develop safer, more environmentally friendly, more energy saving and more intelligent new products. On April 19,2022, at the operation meeting of China Railway Group, Lu Dongfu, then chairman of China Railway Group, continuously promoted the domestic application of key parts of high-speed railway, promoted CR450 science and technology innovation project and continuously improved the self-reliance and self-improvement ability of railway science and technology.

Currently, China's high-speed railway bullet trains operate at a high speed of 350 kilometers per hour, maintained by the Fuxing CR400AF and CR400BF. China Railway Group told China Business News that although the high test speed of the two trains reached 420 km / h, if the reserved conditions of 400 km / h, it is necessary to keep enough speed redundancy in order to ensure safety."In other words, the high test speed must reach 450 to 460 km / h."He said.