Automatic EI-133 Lamination Stacking Machine for Large Power Transformer Core Assembly, ±0.1 mm Accuracy, 250 Stacks/Min, PLC Control, CE

EI-133 Automatic Lamination Stacking Machine for Large Power Transformer Core Assembly

The EI-133 automatic lamination stacking machine brings full automation to the largest core size in the standard EI range. Designed for EI-133 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. For manufacturers of 1000-3000 VA transformers, it replaces the slow, labor-intensive manual stacking that large cores traditionally demand — and removes the quality risks that come with it.

The Economics of Automating Large-Core Stacking

Every argument for automation gets stronger as core size grows. An EI-133 lamination carries more steel, more value, and more handling effort than any smaller format: manual stacking of a single large core can occupy a skilled worker for minutes, and one mis-inserted or skewed lamination wastes far more material than the same error on a small core. Large cores also magnify the cost of air gaps and loose stacking, because core loss directly determines the efficiency rating that customers pay for. This machine addresses all three economics at once — labor per core drops to a fraction of manual stacking, scrap from handling errors falls below 0.3 percent, and consistent interleaved stacking protects the magnetic performance that large transformers are sold on.

Key Specifications

Productivity Features That Pay Back the Investment

✅ Up to 250 Stacks per Minute – The automated feeding and insertion cycle completes in seconds what manual stacking takes minutes to do on large cores. Across a production shift, the throughput difference compounds into finished cores per day that manual lines cannot match.

✅ Recipe Storage on PLC Touch Screen – Lamination count, stacking speed, and dwell time are saved per batch on the 7-inch HMI. Changeover between production batches takes under 30 seconds, keeping large-core lines flexible without dedicated setup labor.

✅ Photoelectric Counting with Auto-Stop – Every lamination is counted and verified by a high-speed photoelectric sensor; a misfeed or jam stops the machine within 0.5 seconds, protecting the die set and the partially stacked core. Scrap rate stays below 0.3 percent.

✅ Full Electrical Protection for Uptime – AC220V overload protection, DC24V short-circuit protection, dual grounding, and an emergency stop button safeguard continuous operation in three-shift production.

Accuracy That Protects Core Value

✅ ±0.1 mm Stacking, ±0.02 mm Positioning – On a large core, small geometric errors translate into measurable efficiency losses. Precision stacking keeps the lamination column tight and the air gaps minimized, protecting the efficiency rating that large transformers are certified and sold on.

✅ Interleaved Stacking for Uniform Flux – The one-by-one E and I interleaved pattern distributes flux evenly across the full core cross-section, which matters most in high-power designs where core loss and noise are acceptance criteria.

✅ CRGO and CRNGO Dual Compatibility – The feeding mechanism handles both grain-oriented and non-oriented silicon steel from 0.3 mm to 0.5 mm thickness, so material selection can be optimized for efficiency or cost on each project.

Applications

The EI-133 lamination stacking machine is used in the production of:

• 1000-3000 VA isolation and distribution transformers

• Industrial rectifier and control transformers

• High-power UPS and inverter transformers

• Large reactor and choke cores for drives and filters

• Specialty electromagnetic assemblies requiring EI-133 core stacking

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.