The stacked laminations are assembled into a coil shape. This can be done manually or using automated equipment depending on the size and complexity of the transformer core.

Clamping mechanisms or fixtures may be used to hold the laminations together during the assembly process to ensure proper alignment and minimize gaps.

Core Binding: Once the laminations are assembled into a coil shape, they are bound together using banding materials such as steel straps or tapes. This binding helps to maintain the integrity of the core and prevent the laminations from shifting.

Core Testing: After assembly, the core undergoes rigorous testing to verify its magnetic properties, core losses, and dimensional accuracy. This testing ensures that the core meets the efficiency and performance requirements specified for the transformer.

Final Processing: Depending on the transformer design, the core may undergo additional processing such as punching or cutting to create openings for winding coils.

Surface treatments or coatings may also be applied to protect the core against environmental factors and improve its durability.

Efficiency: Proper assembly ensures minimal energy losses (core losses), which is crucial for the efficiency of the transformer.

Reliability: A well-assembled core coil provides mechanical strength and stability, reducing the risk of mechanical failure during operation.

Performance: The magnetic properties of the core coil directly influence the transformer's ability to regulate voltage, handle loads, and maintain stable operation.

Core coil assembly in CRGO transformers requires precision and adherence to standards to achieve optimal performance and reliability. Manufacturers employ advanced machinery and quality control measures to ensure that each core coil meets stringent requirements for electrical and mechanical performance.