Automatic EI-114 Lamination Stacking Machine for High Efficiency Power Transformer Core Assembly, ±0.1 mm Accuracy, 250 Stacks/Min, PLC Control, CE

EI-114 Automatic Lamination Stacking Machine for High Efficiency Power Transformer Core Assembly

The EI-114 automatic lamination stacking machine is built for large power transformer cores where material choice and stacking quality jointly determine performance. Designed for EI-114 silicon steel laminations, it feeds E-type and I-type sheets alternately into pre-wound bobbins under closed-loop PLC control, completing interleaved stacking at up to 250 stacks per minute with stacking accuracy of plus or minus 0.1 mm and positioning accuracy of plus or minus 0.02 mm. It is the production platform for manufacturers of 500-1200 VA power transformers who need one machine to run both grain-oriented and non-oriented steel — without compromise on either.

CRGO or CRNGO: One Machine, Both Materials

Material selection is one of the most consequential decisions in transformer design, and it differs project by project. Grain-oriented silicon steel (CRGO) delivers superior permeability in the rolling direction and is the choice for efficiency-critical designs where every watt of core loss matters. Non-oriented steel (CRNGO) offers uniform magnetic properties in all directions at lower cost, and is preferred where balanced flux behavior and budget control dominate. Thickness adds another axis: 0.3 mm and 0.35 mm sheets reduce eddy-current losses for high-efficiency ratings, while 0.5 mm sheets maximize mechanical stiffness and economy. The EI-114 stacking machine's feeding mechanism — magazine, separator, and insertion dies — handles all of these: CRGO and CRNGO, from 0.3 mm to 0.5 mm, with no mechanical change between grades. Material follows the design, not the machine's limitations.

Key Specifications

Consistent Stacking Across Every Material

✅ No-Changeover Material Switching – Switching between CRGO and CRNGO sheets, or between 0.3 mm and 0.5 mm thickness, requires no die change or mechanical adjustment. The feeding and insertion mechanism separates and places each sheet with the same controlled motion regardless of grade.

✅ Gentle Handling Protects Material Value – Large CRGO laminations carry significant material cost. The dedicated feeding path handles them without edge damage, bending, or double-picks — protecting both the sheet and the oriented steel's sensitive surface insulation.

✅ Photoelectric Counting with Auto-Stop – Every lamination is counted and verified in-cycle; misfeeds stop the machine within 0.5 seconds, holding scrap below 0.3 percent even on premium material where each rejected sheet hurts.

✅ Recipe Storage per Material and Batch – Stacking parameters are stored as named recipes on the 7-inch HMI and recalled in under 30 seconds, so a CRGO project and a CRNGO project can alternate without re-configuration errors.

Large-Core Precision

✅ ±0.1 mm Stacking, ±0.02 mm Positioning – On a large core, geometric errors scale into real efficiency losses. Precision stacking keeps the lamination column tight and air gaps minimized, so the efficiency rating designed into the material is the efficiency rating measured in the finished transformer.

✅ Interleaved Stacking for Uniform Flux – The one-by-one E and I interleaved pattern distributes flux evenly across the full core cross-section — essential in large cores where flux crowding raises local losses and noise.

✅ Full Electrical Protection – AC220V overload protection, DC24V short-circuit protection, dual grounding, and an emergency stop button protect continuous multi-shift production.

Applications

The EI-114 lamination stacking machine is used in the production of:

• 500-1200 VA power transformers for industrial equipment and infrastructure

• High-efficiency isolation transformers built on CRGO steel

• Cost-optimized transformer lines running CRNGO material

• Step-down and distribution transformers for commercial systems

• Reactor and choke cores for drives, filters, and power factor correction

Custom tooling for other EI sizes (EI-28 through EI-133) is available on request, so production can cover the full EI range on one platform.

After-Sales & Support

Direct factory supply with competitive pricing and CE certification. We have supplied EI lamination stacking equipment to globally recognized transformer manufacturers including GE Vernova, Eaton, CATL, and Chint Electric, with products exported to more than 20 countries. Delivery within 1-15 working days. The after-sales package includes video installation guidance, remote PLC parameter support, spare parts supply, and a 12-month warranty from the date of delivery.