What Is “invisible guard” of Motor for Rail Transit? The Motor Pressure Ring

A high-speed motor power system is one of the key representatives of high iron at the core of modern rail transit; the stability and reliability of the power system directly affect the operation efficiency and safety of the train. In the complex structure of high-speed railway traction motors, although the motor pressure ring is a seemingly ordinary component, it bears vital functions. It is called the “invisible guard” of the efficient operation of the motor.

the motor pressure ring:cast steel component of rail

The Function and Structure Design

The function and structure design for the clamping ring is usually installed on both ends of the motor rotor motor; the primary function is through the fixed motor winding and precision pressure to prevent it due to the centrifugal force in the high-speed rotating or vibrating displacement or deformation. This component needs to be stable under extreme conditions of high-frequency vibration, severe temperature changes and electromagnetic interference, and its structural design needs to be both strong and lightweight. Modern high-speed iron motor press rings are mostly made of high-strength alloy materials (such as special stainless steel or titanium aluminum alloy), which are manufactured by precision forging and heat treatment process to ensure their mechanical properties stability in the environment of -40℃ to 200℃.

Technology Innovation and Performance Optimization

Technology innovation and performance optimization in response to the operation requirements in excess of 350 kilometers per hour, clamping ring on the design of a new generation of breakthrough technology bottlenecks: with low permeability materials reduce the eddy current loss, improve the motor efficiency; The surface is treated with nanometer coating to enhance wear resistance and corrosion resistance; Bionic design is introduced in the structure to reduce weight while maintaining structural rigidity through honeycomb hollowing. Some advanced models also integrate temperature sensors to achieve real-time monitoring of operating status.

Manufacture Process and Quality Control

Manufacture process and quality control of the motor pressure circle involved in precision stamping, laser welding, dynamic balance calibration and so on more than 20 procedures, key size tolerance should be controlled within + / – 0.01 mm. Production enterprises generally adopt intelligent production lines, and the machine vision inspection system ensures that the surface finish, concentricity and assembly accuracy of each press ring meet aviation-grade standards. As “bones” of the traction motor, the performance of the compression ring motor has a close relationship with the power output efficiency and life cycle. According to statistics, the high-quality pressure ring can increase the efficiency of the motor by 3%-5% while reducing the failure rate by 40%. Under the strategic background of China’s high-speed rail “going out,” the domestic motor pressure ring has passed the EU TSI certification, and its technical standards have reached the international leading level, becoming a micro epitome of China’s high-end manufacturing strength. With the development of maglev trains and another new type of rail transit, the motor pressure will continue evolving to the integration of superconducting materials and molding in the more extreme working conditions to protect the safety of power systems and fuel rail transit technology towards a new height.

Processing Craft:

Drawings→ mould making → die casting →rough machining → CNC machining→surface treatment →product checking→ packing →delivery