INDUSTRY COMPONENT

Electrical Steel Laminations

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

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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
  • Density 7.65 g/cm³
  • Thickness 0.1-0.5 mm
  • Coating Type C5, phosphate, oxide
  • Permeability 1500-5000 μ
  • Silicon Content 1-3.5%
  • Stacking Factor 0.95-0.98
  • Core Loss (W/kg) 1.0-2.5 at 1.5T, 50Hz
Standards
ISO 404, DIN EN 10106, IEC 60404-8-7, ASTM A876

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Electrical Steel Laminations.

electrical steel laminations silicon steel laminations transformer core laminations motor laminations eddy current loss magnetic core grain-oriented steel non-oriented steel Electrical Steel Laminations in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Electrical Steel Lamination Core

Stacked electrical steel laminations forming magnetic cores for motors, generators, and transformers

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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

Interchangeable Parts

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

Buyer Feedback

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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