EI-66 Automatic Lamination Stacking Machine for Medium Power Transformer Core Assembly
The EI-66 automatic lamination stacking machine is purpose-built for medium-capacity transformer core production, handling EI-66 silicon steel laminations with precision and reliability. It is the ideal upgrade from manual or semi-automatic methods for manufacturers producing 50-200 VA power transformers, current/voltage instrument transformers, and reactor cores. Under closed-loop PLC control, the machine feeds E-type and I-type laminations alternately into pre-wound bobbins, completing the interleaved stacking process at speeds up to 250 stacks per minute with stacking accuracy of plus or minus 0.1 mm. This eliminates the gap error and loose stacking common in manual operations, raising core permeability consistency above 95 percent.
From Silicon Sheet to Finished Core — One Automated Cycle
The EI-66 stacking process follows a streamlined single-cycle workflow: the operator loads pre-cut EI-66 silicon steel sheet stacks into the feeding magazine and places the wound bobbin on the fixture. The PLC system then activates the pneumatic feeding mechanism, which separates and picks individual E-laminations, inserts them into the bobbin window, then picks and inserts I-laminations in an interleaved pattern. A photoelectric sensor counts each lamination and verifies insertion. Upon reaching the preset count, the machine automatically stops and signals completion. The finished core is removed and ready for the next production step — varnishing, testing, or assembly. The entire cycle takes only a few seconds per core, with no manual lamination handling required.
Key Specifications
| Parameter |
Details |
| Model |
EI-66 |
| Lamination Type |
EI-66 silicon steel, E & I interleaved stacking |
| Stacking Accuracy |
±0.1 mm |
| Positioning Accuracy |
±0.02 mm |
| Stacking Speed |
Up to 250 stacks per minute |
| Applicable Transformer Capacity |
50-200 VA power and instrument transformers |
| Bobbin Window Width |
22 mm (suitable for EI-66 core sets) |
| Silicon Steel Thickness |
0.3 mm, 0.35 mm, 0.5 mm cold-rolled grain-oriented (CRGO) or non-oriented (CRNGO) |
| Stacking Mode |
Interleaved (one-by-one E and I lamination insertion) |
| Counting Method |
Photoelectric sensor with automatic count verification |
| Power Supply |
AC 200-250V, 50/60 Hz (customizable for different regions) |
| Service Air Pressure |
0.4-0.65 MPa, dry and clean compressed air |
| Control System |
Mitsubishi PLC with 7-inch touch screen HMI |
| Safety Protection |
AC220V overload protection, DC24V short-circuit protection, dual grounding, emergency stop |
| Operating Temperature |
0 to 45 degrees Celsius |
| Machine Weight |
Approx. 85 kg |
| Warranty |
12 months from delivery |
What Makes the EI-66 Machine Different
✅ Optimized for Medium-Sized Cores – The feeding magazine, insertion dies, and bobbin fixture are specifically dimensioned for EI-66 laminations. Unlike universal stacking machines that require frequent changeover, this dedicated model maintains consistent feeding and insertion performance across long production runs of the same core size.
✅ Photoelectric Counting with Anti-Jam Logic – Each lamination is counted by a high-speed photoelectric sensor. If a misfeed or jam is detected, the machine auto-stops within 0.5 seconds, preventing damage to the die set or the partially stacked core. This reduces scrap rate to below 0.3 percent.
✅ CRGO and CRNGO Dual Compatibility – The feeding mechanism handles both grain-oriented and non-oriented silicon steel sheets from 0.3 mm to 0.5 mm thickness, giving manufacturers flexibility in core material selection for different efficiency and cost targets.
✅ Interleaved Stacking for Superior Magnetic Performance – The one-by-one E and I interleaved pattern produces cores with uniform flux distribution and minimized air gaps, which is critical for medium-power transformers where core loss directly impacts efficiency ratings.
✅ PLC Touch Screen with Recipe Storage – Operators can save and recall stacking parameters (lamination count, speed, dwell time) for different production batches. Parameter changeover between batches takes under 30 seconds.
✅ Compact Footprint for Workshop Flexibility – At approximately 85 kg, the machine is portable enough for relocation within the production line. It connects to standard pneumatic supply and AC power, requiring no special foundation.
Applications
The EI-66 lamination stacking machine is widely used in the production of:
• 50-200 VA power transformers for industrial control and power supplies
• Current transformers (CT) and voltage transformers (PT) for metering and protection
• Audio and output transformers for amplifiers and broadcast equipment
• Reactor and choke cores for filters and power factor correction
• Specialty electromagnetic components requiring EI-66 core stacking
Custom tooling for other EI sizes (EI-28 through EI-133) is available upon request, enabling manufacturers to expand production scope with a single 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 over 20 countries. Delivery within 1-15 working days. Comprehensive after-sales package includes installation guidance via video, remote PLC parameter support, spare parts supply, and a 12-month warranty from the date of delivery.
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Automatic EI-66 Lamination Stacking Machine for Medium Power Transformer Core Assembly, ±0.1 mm Accuracy, 250 Stacks/Min, PLC Control, CE Images
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