CRGO Lamination
CRGO (Cold Rolled Grain Oriented) Lamination is a specialized electrical steel product used for manufacturing transformer cores. Made from Cold-Rolled Grain-Oriented Electrical Steel, it offers high magnetic permeability and electrical resistivity in the rolling direction. This unique grain structure minimizes core losses, enhances magnetic efficiency, and ensures long-term performance of transformers.
Available in various thicknesses such as 0.20mm, 0.23mm, 0.27mm, and 0.30mm, the latest 0.18mm CRGO variant further improves energy efficiency. CRGO is supplied in coil form, either eye-to-sky or eye-to-wall position, with width ranges from 900mm to 1260mm and weights between 2MT to 10MT. From these mother coils, precision CNC slitting lines are used to cut laminations into exact widths as per transformer design specifications, ensuring superior dimensional accuracy and minimal wastage.
“CRGO steel ensures high efficiency, reduced losses, and long-lasting performance in transformer cores.”
Technical Team, JAAS Steel Pvt. Ltd.
Key Features
Why CRGO Laminations are vital for transformer applications:
- High Magnetic Permeability in the Rolling Direction
- Reduced Core Losses for Improved Efficiency
- Precision CNC Slitting for Accurate Dimensions
- Suitable for Eye-to-Sky and Eye-to-Wall Coil Handling
- Long-Term Durability and Reliability
CRGO coils are the preferred choice for energy-efficient transformers, while CRNO finds usage in motors, generators, and appliances where efficiency requirements are moderate.
Working Process
Our streamlined process ensures reliability and top performance:
Raw Material Inward
Material: CRGO coils are received from approved suppliers.
Checks: Visual inspection, test certificate verification (core loss, thickness, grade).
Storage: Coils stored in clean, dry area to prevent rust or damage.
RM Selection as per requirement.
Slitting Process
Purpose: To slit wide CRGO coils into narrow strips as per lamination width requirement.
Process: Coil loaded on decoiler → passed through slitting cutter for precise width cutting → rewound into slit coils.
Quality Checks: Width accuracy, burr level, edge quality.
Cutting Process
Purpose: To cut slit strips into required lamination lengths and shapes.
Process: Slit coil fed to cut-to-length or step-lap cutting machine. Pieces cut as per design with proper step-lap or butt-lap.
Checks: Length tolerance, burr, step accuracy, orientation marking.
Note: For certain designs, holes, slots, or notches are punched to aid assembly and clamping.
Core Assembly
Purpose: To assemble laminations into complete transformer cores.
Process: Laminations are stacked layer by layer as per core design (step-lap configuration). Tightening bolts or frames applied to ensure proper compression.
Checks: Dimension accuracy, stacking factor, loss test (NLL), insulation intactness.
Testing & Inspection
Core Loss & Magnetic Flux Density measured using Epstein
Dimensional, burr, and insulation checks done.
Results recorded and verified against specifications.
Packing & Dispatch
Laminations packed in moisture-proof wrapping on wooden pallet.
Proper labeling with grade, lot no., dimensions, and weight.
Dispatched to transformer manufacturers or customers.
Purpose
To produce precision CRGO laminations with minimal core loss, accurate dimensions, and consistent quality for use in power and distribution transformer cores.
Applications
CRGO Laminations are used in power and distribution transformers to ensure low core losses and high efficiency. They are also applied in current and potential transformers, inductors, magnetic cores, reactors, and other electrical equipment where superior magnetic performance and durability are essential.
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