INDUSTRY COMPONENT

Electrical Steel Laminations

Electrical steel laminations are thin, insulated sheets stacked to form transformer and motor cores, minimizing eddy current losses.

Component Specifications

Definition
Electrical steel laminations are precision-stamped or laser-cut thin sheets of silicon steel, typically 0.1-0.5 mm thick, coated with an insulating layer (e.g., phosphate, oxide, or C5 coating). They are stacked and bonded to form the magnetic core of electrical machines like transformers, motors, and generators. The laminations reduce eddy current losses by interrupting conductive paths, while the grain-oriented or non-oriented silicon steel provides high magnetic permeability and low hysteresis loss.
Working Principle
Electrical steel laminations work by providing a low-reluctance path for magnetic flux in electrical machines. When stacked, the insulated layers prevent large circulating eddy currents that would occur in a solid core, reducing energy losses as heat. The silicon steel's crystalline structure aligns with the magnetic field direction (in grain-oriented types) to enhance magnetic efficiency. During AC operation, the laminations' thinness and insulation limit eddy currents to small loops within each lamination, minimizing core losses and improving efficiency.
Materials
Cold-rolled non-oriented (CRNO) or grain-oriented (GO) silicon steel, with 1-3.5% silicon content; insulation coatings include inorganic (e.g., magnesium silicate, aluminum phosphate) or organic (e.g., epoxy, C5) types; thickness ranges from 0.1 mm to 0.5 mm.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Density7.65 g/cm³
Thickness0.1-0.5 mm
Coating TypeC5, phosphate, oxide
Permeability1500-5000 μ
Silicon Content1-3.5%
Stacking Factor0.95-0.98
Core Loss (W/kg)1.0-2.5 at 1.5T, 50Hz

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 404, DIN EN 10106, IEC 60404-8-7, ASTM A876

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Core overheating due to insulation failure
  • Increased eddy current losses from damaged coatings
  • Magnetic saturation under high flux densities
  • Mechanical deformation during stacking
FMEA Triads
Trigger: Insulation coating degradation from overheating or moisture
Failure: Increased eddy current losses, reduced efficiency, and core overheating
Mitigation: Use high-temperature resistant coatings, ensure proper cooling, and conduct regular insulation resistance tests
Trigger: Improper stacking or misalignment of laminations
Failure: Increased magnetic reluctance, vibration, and noise in operation
Mitigation: Implement precision stacking techniques, use alignment tools, and perform quality checks on stack uniformity

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Thickness tolerance ±0.01 mm, flatness <0.1 mm/m, dimensional accuracy ±0.05 mm
Test Method
Core loss testing per IEC 60404-2, coating resistance per ASTM A976, magnetic permeability measurement per ISO 404

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Electrical Steel Laminations

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Lammotor
Jiaxing, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

Why are electrical steel laminations insulated?

The insulation between laminations prevents large eddy currents from flowing across the stack, reducing energy losses and heat generation in the core.

What is the difference between grain-oriented and non-oriented electrical steel?

Grain-oriented steel has aligned crystals for superior magnetic properties in one direction, ideal for transformers; non-oriented steel has random crystals for uniform properties, suited for rotating machines like motors.

How are electrical steel laminations manufactured?

They are produced by cold rolling silicon steel into thin sheets, applying an insulating coating, and then stamping or laser-cutting into shapes before stacking and bonding.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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