GB/T 39425-2020 in English
VALIDGeneral technical specfication for the permanent magnetic direct drive motor bogie of urban rail transit
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39425-2020城市轨道交通车辆永磁直驱转向架通用技术条件》由TC290（全国城市轨道交通标准化技术委员会）归口，主管部门为住房和城乡建设部。
Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for permanent magnet direct-drive bogies for urban rail transit with a maximum operating speed of ≤120km/h, with the focus on:
- Two types of bogie types: rigid axle-clamp type (Type I) and elastic axle-clamp type (Type II)
- Key technical indicators: bogie weight, wheelbase, wheel diameter and other parameter limits
- Full life cycle requirements: The design life of the frame and motor body is 30 years
Technical parameter comparison
| Project | Type I bogie | Type II bogie |
|---|---|---|
| Maximum speed | ≤80km/h | ≤120km/h |
| Drive mode | Rigid shaft holding | Elastic shaft holding |
| Weight when axle load ≤14t | ≤6.5t | ≤7.5t |
| Typical wheelbase | 2.0-2.3m | 2.2-2.3m |
Key technologies of permanent magnet motors
The standard puts forward strict requirements for permanent magnet direct drive motors:
- Protection level ≥ IP54 (junction box ≥ IP65)
- Noise ≤ 95dB(A)
- Bearing L10 life ≥ 2.5 million kilometers
- Dynamic balance level G2.5 or above
- Rotor residual magnetism ≤ 0.5mT
Typical case: After a subway line adopted Class II bogies, the energy consumption of traditional asynchronous motors was reduced by 15%, and the maintenance cycle was extended to 1.2 million kilometers.
Test verification system
The standard establishes a three-level verification mechanism:
| Test type | Key items | Implementation standard |
|---|---|---|
| Type test | Temperature rise test, anti-demagnetization test | GB/T25123.4 |
| Routine test | Insulation resistance determination, withstand voltage test | IEC61373 |
| Dynamic test | Derailment coefficient, wheel weight reduction rate | GB/T5599 |
Implementation recommendations
- Design phase: Focus on the modal matching of the motor and the wheelset, and it is recommended to use finite element analysis to optimize the structure
- Manufacturing phase: Strictly control the welding process (must comply with EN15085), and perform 100% non-destructive testing on key welds
- Operation and maintenance phase: Regularly check the bearing lubrication status, and it is recommended to rotate the bogie every 3 months to change the bearing load position
This standard systematically regulates the application of permanent magnet direct drive technology in rail transit bogies for the first time, providing a unified technical benchmark for the industry.
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