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The reason why the traction motor “locked up” failure occurred in the CRH2 EMU

Release time:2020-06-07 17:07Popularity:

With the rapid development of my country's economy, EMU trains have begun to be widely used in railway passenger transportation services, which greatly increases the transportation speed between the two places and brings great convenience to people traveling long distances.Although advanced electric trains have made great progress compared with traditional railway trains, due to the influence of man-made, natural and other factors, there are many problems in the operation of electric trains. This needs to be solved in time. The focus of the discussion is the traction that appears in the CRH2 EMUMotorThe cause of the "lock-up" fault and its solutions.

In recent years, with the increasing proportion of EMU trains in my country’s railway transportation services, the problems and breakdowns of EMUs have gradually become prominent, bringing great safety hazards to railway transportation and serious threats to the lives of passengers. .Traction motor "locking" failure is a high-frequency operation accident that occurs during the operation of high-speed trains. There have been many such accidents during 2014 alone. Therefore, we must attach great importance to such accidents and take timely and effective solutions. Measures.

1. Overview of CRH2 EMU traction motors and "locking" faults

The working principle of the CRH2 EMU traction system is mainly composed of the four systems of pantograph, traction transformer, traction converter and traction motor. Through their mutual conversion, power is transmitted to the traction motor. In order to realize the operation of the entire train, there are currently two main types of traction motors for CRH2 EMUs commonly used in China: One is the MB-5120-A traction motor, which is mainly used for 200KM/H and 300KM/H EMUs. ; The other is the YQ-365 type. The capacity and power of this motor have been greatly improved, and it is mainly used in high-speed EMUs with speeds above 350KM/H in China.

The so-called "lock-up" failure of the tractor can be divided into two categories: one is that occurs under traction or inert conditions, because the traction force on the wheel circumference greatly exceeds the limit, causing the wheels to rotate rapidly but the vehicle speed is slow or slow. It is a phenomenon that does not move at all. When the maximum shaft speed is greater than 100km/h, and the broken shaft speed is less than 3km/h, the report lasts for more than 2 seconds; the other is when the brake is in the braking condition or the brake is turned to traction. Under 1.5S working conditions, because the braking force exceeds the adhesion limit, the speed of the wheels drops sharply or the vehicle speed slows down and stops due to outage. The sliding axis speed is above 5KM/h and lasts for 5 seconds Reported above the clock.This kind of "lock-up" failure occurs during the driving of the EMU, and there is a huge safety hazard, which seriously threatens the life of passengers. Therefore, we must find out the cause in time for this kind of accident and take effective measures.

2. The main reason for the "lock-up" failure of the traction motor of CRH2 EMU

(1) The manufacturing technology is not good enough, and there are problems with the quality of the traction motor.

The traction motor is the main component of the EMU operation. The technical requirements for this component are very high. However, due to the actual production process, the formation of the final formed traction motor requires many implementation steps. No matter which step in the assembly process, errors will occur. The quality of the final formed traction motor is greatly reduced.Therefore, when the manufacturing technology does not pass, it will also cause the traction motor to "lock up" during operation.

(2) There are problems in the connection of parts and components, which can easily lead to failure of the traction motor.

The work of traction motor is mainly produced by the action of components such as bearings and speed sensors. In actual operation of these components, some sensor disconnection and bearing sliding problems may occur. These problems are also likely to cause traction. The motor's "lock-up" failure caused the EMU to suddenly lose control, posing a huge threat to the lives of passengers in operation.

(3) The limited technical level of the operators and the mistakes in the operation process caused the traction motor to "lock up".

The current EMU operation has not yet achieved a completely unmanned operation level. It is mainly completed by the operation of the EMU technicians. However, because the technical capabilities of some EMU members have not reached the actual operating level, some technicians are directly in the process of operation. There are sloppy problems, and these reasons may cause the tractor to "lock up".

(4) The occurrence of "lock-up" failure of the tractor caused by a sudden accident in operation.

During the operation of the high-speed train, we cannot guarantee that all the running parts can be XNUMX% free of problems. It is very likely that some operations such as the failure of the anti-skid valve, the blocking of the drive transmission, and the blocking of the wheelset bearing may occur during the operation. Problems, the existence of these problems will also cause the tractor to suddenly stop operating, causing a "lock-up" safety accident.

3. Effective measures to prevent the occurrence of "lock-up" failure of the traction motor of CRH2 EMU

Traction motor "locking" failure is the most frequently occurring problem in CRH2 EMUs. In order to better solve such problems, we must take effective measures against it:

(1) Strengthen technological innovation and improve the quality of traction motors

Science and technology are the primary productive forces. The root cause of the "locking" problem of traction motors is that my country's technical level is not good enough, and technical capabilities need to be further improved.Therefore, in order to more effectively prevent the occurrence of "lock-up" failures, our first measure is to carry out technological innovation, constantly adopt new technologies and new methods to improve the overall quality of the traction motor, so as to prevent the occurrence of failure accidents from the source.

(2) Strengthen motor maintenance, and conduct regular maintenance

Traction motor is a constantly moving thing. During its movement, some problems such as wear or loose parts will definitely occur. Therefore, we should strengthen daily maintenance on the premise of improving quality and regularly check and maintain the traction motor. Ensure that it can work normally.

(3) Strengthen the training of technical personnel to improve technical operation ability and operation level.

The negligence of daily operations is also one of the important reasons for the problem. In order to effectively guarantee the safe and stable operation of our trains, our technicians must improve their sense of responsibility and sense of responsibility. At the same time, we should also conduct regular regular Training to continuously improve their theoretical level and operational ability.

4. Conclusion

As people’s travel frequency continues to increase, people’s demand for railway transportation and transportation speed have presented new challenges. In recent years, the social demand for EMUs has increased. In order to better protect the life safety of railway passengers, We must take effective safety measures to promptly resolve safety accidents such as "locking" of traction motors, so as to effectively improve the safety and efficiency of railway operation.


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