Rail Transit

Rail transit traction systems impose stringent requirements on equipment safety, power density, mechanical reliability, and service life. We provide high thermal-class, mechanically robust, and reliable magnet wire solutions for traction motors, traction transformers, and auxiliary electrical equipment.

Applications Overview

Rail transit equipment operates under high loads, frequent start-stop cycles, and continuous vibration:

Starting, acceleration, and braking create frequent current and load variations.
High power density in traction systems results in significant winding temperature rise and thermal cycling.
Vehicle operation generates continuous vibration and mechanical shock.
Limited installation space requires high winding space utilization.
Long-term traction service requires excellent insulation aging resistance and mechanical reliability.
High failure costs for critical equipment demand strict product consistency and quality control.

Customer Challenges

Insulation wear caused by continuous vibration
High traction-system temperature rise
Thermal fatigue from frequent start-stop operation
Limited space with high power demand
Insulation damage from mechanical shock
High reliability requirements for critical equipment

✔

Key Requirements

High mechanical strength and abrasion-resistant insulation
High thermal class and stable insulation performance
Improved thermal cycling endurance
High slot fill and precise dimensional control
Improved adhesion and structural stability
Strict batch consistency and full-process traceability

Yuheng Solution

High-strength insulation

Fiberglass covering, mica tape wrapping, and composite insulation structures

High thermal-class systems

High-precision rectangular wires

Vibration and abrasion optimization

Batch consistency

Quality traceability

Applicable Equipment

Traction motors
Traction transformers
Auxiliary motors
Reactors
Onboard converters
Auxiliary power supply systems
Other rail transit electrical equipment

Capability Evidence

Withstand & PD Testing

Automated voltage tester verifies withstand and PD levels reel by reel.
Surface & Dimension Inspection

Vision measuring for OD tolerance and batch consistency control.
Dielectric Loss Testing

Low tanδ verified for long-term insulation reliability.
Full-Process Laboratory

Mechanical, resistance and thermal testing with full traceability

Tell Us About Your Application

Share your winding specifications and loss requirements — our engineers will confirm the transposition and insulation design and reply within one day.