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Kamol
Engineering Services Co.,ltd.
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High-Precision Roebel Bar Manufacturing for Maximum Generator Performance

We specialize in the design and manufacture of high-quality Roebel bars, utilizing conductor transposition technology to reduce losses and boost efficiency in large industrial machines.

Transposed Coils and Roebel Bars

Kamol Engineering Service Co., Ltd. operates dedicated machinery for producing transposed coil conductors (Roebel bars) used in the generators of large power plants and hydroelectric dams with capacities of 20 MW and above. We have been ISO 9001–certified since 2008; our current quality system conforms to ISO 9001:2015, ensuring high quality at every stage of production.

What Is a Roebel Bar and Why It Matters

A Roebel bar is a specialized conductor used in the stator windings of large AC generators and motors. It is constructed from multiple insulated copper sub-conductors that are continuously transposed along the length of the bar (known as Roebel transposition). The core design objective is to reduce electrical losses caused by the skin effect and proximity effect, which are significant in large conductors. As a result, machines operate with higher efficiency, reduced thermal buildup, and longer service life. Selecting a high-quality Roebel bar is therefore a critical investment in overall system stability.  

Technical Specifications

Feature  Specification
Conductor Material Oxygen-Free Copper (OFC) 99.9%
Sub-Conductor Insulation Enamel, Glass Fiber, Nomex®, Kapton®
Main Insulation Mica-glass tape, Polyester-glass tape
Transposition Type 360° and 540° transposition
Insulation Class Class F (155 °C), Class H (180 °C)
Impregnation Process Vacuum Pressure Impregnation (VPI)
Applicable Standards IEC, NEMA, or per customer specification
Quality Tests Hi-Pot Test, Dimensional Check, Insulation Resistance Test

The Kamol Engineering Advantage

Precision Manufacturing Rigorous Testing
Forming and bending are controlled by modern CNC machinery, ensuring Roebel bars with precise dimensions and geometry that fit the stator slot perfectly. Every product undergoes high-voltage Hi-Pot testing and meticulous dimensional inspection, so you can rely on maximum quality and safety.

Applications & Industries

Roebel Bar ของเราถูกออกแบบมาเพื่อรองรับการทำงานหนักในเครื่องจักรที่มีความสำคัญสูงในอุตสาหกรรมต่างๆ ได้แก่:

  • Hydro Generators
  • Turbo Generators in thermal and nuclear power plants
  • Large Synchronous Motors
  • Heavy-industry machinery, such as mining and steelmaking

Discuss your Roebel bar project with our specialists.

Our engineering team is ready to consult, design, and manufacture to your exact technical specifications.