Automatic EI-76 Lamination Stacking Machine for Isolation and Power Transformer Core Assembly, ±0.1 mm Accuracy, 250 Stacks/Min, PLC Control, CE

EI-76 Automatic Lamination Stacking Machine for Isolation and Power Transformer Core Assembly

The EI-76 automatic lamination stacking machine serves the production reality of most transformer workshops: many core types, moderate batch sizes, and delivery dates that do not wait. Built for EI-76 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 right machine for manufacturers producing 150-400 VA isolation and power transformers in mixed-batch schedules, where a dedicated machine must still deliver dedicated-machine consistency.

Built for Mixed-Batch Production

High-volume lines optimize for one product; real workshops switch between them. The EI-76 stacking machine is designed around that switching. Stacking parameters — lamination count, insertion speed, and dwell time — are stored as named recipes on the 7-inch PLC touch screen. When the schedule moves from one transformer model to the next, the operator recalls the stored recipe in under 30 seconds instead of re-configuring the machine from memory. Photoelectric counting with automatic verification runs identically on every batch, whether it is 50 cores or 5,000, so quality does not depend on how long the line has been running the same job. One operator supervises the machine rather than feeding it, and short runs stop being unprofitable runs.

Key Specifications

One Platform, the Full EI Range

✅ Custom Tooling for Every EI Size – The EI-76 machine is one instance of a platform that covers EI-28 through EI-133 with dedicated tooling. Manufacturers standardizing on this platform can add capacity for new core sizes without retraining operators or maintaining different control systems.

✅ Material Flexibility – The same feeding mechanism handles grain-oriented (CRGO) and non-oriented (CRNGO) silicon steel from 0.3 mm to 0.5 mm thickness. Material grade can follow each project's efficiency target and budget, with no mechanical change between grades.

✅ Standard Utilities, No Special Installation – The machine connects to standard AC power and dry compressed air at 0.4-0.65 MPa. At approximately 70 kg it needs no special foundation and can be relocated as production layouts change.

✅ Full Electrical Protection – AC220V overload protection, DC24V short-circuit protection, dual grounding, and an emergency stop button are fitted as standard for uninterrupted multi-shift operation.

Consistency Across Every Batch Size

✅ Deterministic PLC Cycles – Closed-loop Mitsubishi PLC control executes the same feed-insert-count sequence on every cycle. The first core of a new batch matches the last core of the previous one — no warm-up drift, no operator dependency.

✅ Photoelectric Counting with Auto-Stop – Each lamination is counted and verified in-cycle; misfeeds stop the machine within 0.5 seconds, holding scrap below 0.3 percent even on short runs where every core matters.

✅ Interleaved Stacking for Core Performance – The one-by-one E and I interleaved pattern minimizes air gaps and distributes flux uniformly — the stacking quality that 150-400 VA isolation transformers depend on for low losses and quiet operation.

Applications

The EI-76 lamination stacking machine is used in the production of:

• 150-400 VA isolation transformers for industrial and commercial equipment

• Safety isolation transformers for machine tools and control systems

• UPS and inverter transformers in the mid-power class

• Step-up and step-down transformers for distributed power systems

• Reactor and choke cores for filters and drives

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.