Silicon Steel Lamination Manufacturer in India

What Is Silicon Steel Lamination?

Silicon steel lamination is a thin sheet of electrical steel that is stamped into a specific shape and stacked to form the magnetic core of electric motors, generators, and transformers. The term "silicon steel" comes from the addition of silicon (typically 1-3%) to the steel, which increases the electrical resistivity of the material. This higher resistivity reduces eddy current losses in the core, making the motor or transformer more energy efficient.

In simple terms, when an electric motor runs, alternating magnetic fields create small circulating currents (called eddy currents) inside the core. These currents waste energy as heat. By using thin laminated sheets of silicon steel instead of a solid block, these eddy currents are greatly reduced. Each lamination is insulated from the next by a thin oxide or varnish coating.

The two main types of silicon steel used in laminations are:

• CRNO (Cold Rolled Non-Oriented) — also called CRNGO. It has uniform magnetic properties in all directions. Used in rotating machines such as motors and generators where the magnetic flux direction keeps changing.
• CRGO (Cold Rolled Grain Oriented) — has superior magnetic properties in the rolling direction. Used mainly in transformer cores where the flux path is fixed.

At SNV Stamping Solutions Pvt Ltd, we specialise in stamping CRNO silicon steel laminations for motor applications. We work with grades ranging from 50C1300 to 50C330, covering standard efficiency to premium efficiency requirements.

CRNO Silicon Steel Grades We Work With

CRNO (Cold Rolled Non-Oriented) silicon steel is classified by its core loss and thickness. The grade name follows a standard format — for example, 50C800 means 0.50mm thickness with a maximum core loss of 8.00 W/kg at 1.5T, 50Hz.

Here is a comparison of the common CRNO grades we work with:

The choice of CRNO grade directly affects motor efficiency, temperature rise, and operating cost. A lower core-loss grade like 50C330 costs more per kilogram but saves energy over the motor's lifetime. Our team can help you select the right grade based on your motor design, target efficiency class, and budget.

Applications of Silicon Steel Laminations

Silicon steel laminations form the magnetic core in a wide range of electric motors and rotating machines. Here are the key applications we serve:

Whether you are building a small BLDC fan motor or a large industrial induction motor, the quality of lamination directly affects motor performance. Tight dimensional control, low burr, and consistent stacking factor are essential for every application. Learn more about our EV motor laminations and BLDC motor laminations.

Our Silicon Steel Stamping Capabilities

SNV Stamping Solutions is equipped with a modern high-speed stamping setup designed for precision motor lamination production. Here is what we bring to the table:

• Yadon 220T High-Speed Press — Our main press is a Yadon 220-ton high-speed stamping press, built for consistent, high-volume lamination production with tight tolerances.
• Yaskawa Servo Feeder — The press is paired with a Yaskawa servo-controlled feeder that handles strip widths up to 400mm and material thickness from 0.2mm to 1mm. Servo feeding ensures accurate pitch control on every stroke.
• Decoiler and Straightener Line — A complete coil-fed line with decoiler and straightener ensures the silicon steel strip enters the die flat and tension-free.
• In-Die Auto Stacking — Laminations are automatically stacked inside the die itself, reducing handling and maintaining alignment accuracy. This is critical for achieving our 97-98% stacking factor.
• Auto Skewing — Rotor laminations can be auto-skewed inside the die at the required angle to reduce cogging torque and noise in the finished motor.
• Separate Cams for Rotor and Stator — Our die setup uses separate cams to control rotor and stator stack heights independently, giving flexibility for different motor designs.
• Burr Control within 0.02mm — Tight die clearances and regular maintenance keep burr height within 0.02mm, which is essential for high stacking factor and insulation integrity.

Quality Standards

SNV Stamping Solutions Pvt Ltd is ISO 9001:2015 certified. Quality is built into our process at every stage:

• Incoming material inspection — We verify the grade, thickness, and surface quality of every silicon steel coil before it enters production.
• In-process dimensional checks — Critical dimensions (ID, OD, slot width, burr height) are checked at regular intervals during the stamping run.
• Burr measurement — Burr height is monitored and maintained within 0.02mm to protect insulation coating and ensure a high stacking factor.
• Stacking factor verification — We measure and verify the stacking factor (97-98%) on stacked lamination assemblies.
• Final inspection and packaging — Finished lamination stacks are inspected, counted, and packed carefully to prevent damage during transit.

We follow a structured approach to quality, breaking every potential problem into small parts and addressing each root cause — an approach rooted in PDCA (Plan-Do-Check-Act) methodology.

Frequently Asked Questions