INDUSTRY COMPONENT

Laminated Core

Laminated core for control transformers, reducing eddy current losses in electrical systems.

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Component Specifications

Definition
A laminated core is a key component in control transformers, constructed from thin, insulated sheets of electrical steel stacked together. This design minimizes eddy current losses by interrupting the path of induced currents, improving efficiency and reducing heat generation in transformer operation. It serves as the magnetic circuit that transfers energy between primary and secondary windings while maintaining precise voltage regulation.
Working Principle
Works by providing a low-reluctance magnetic path for alternating magnetic flux. The laminated structure with insulated layers prevents large circulating eddy currents that would occur in solid metal, reducing energy losses and heat. When AC current flows through transformer windings, it creates a changing magnetic field that induces voltage in adjacent windings via the core's magnetic circuit.
Materials
Electrical steel (silicon steel) sheets, typically 0.23mm to 0.35mm thickness, with insulation coating (C-3, C-4, or C-5 grade). Common grades: M-15, M-19, M-22, M-27, M-36, M-43, M-45, M-47. Silicon content: 2-4.5%.
Technical Parameters
  • Core Loss 1.2-2.5 W/kg at 1.5T, 50Hz
  • Permeability 1500-5000 μ
  • Stacking Factor 0.95-0.97
  • Lamination Thickness 0.23-0.35 mm
  • Insulation Resistance >100 MΩ
  • Operating Temperature -40°C to 155°C
Standards
ISO 4046-4, DIN EN 10107, IEC 60404-8-7, ASTM A876

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Laminated Core.

laminated core transformer core electrical steel silicon steel eddy current loss magnetic core control transformer transformer component laminated steel Laminated Core in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Control Transformer

A transformer that provides low-voltage power for control circuits within motor control centers.

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Engineering Analysis

Risks & Mitigation
  • Core saturation leading to overheating
  • Interlamination short circuits
  • Mechanical damage during assembly
  • Insulation breakdown at high temperatures
  • Magnetic flux leakage
FMEA Triads
Trigger: Poor insulation between laminations
Failure: Increased eddy current losses, overheating, reduced efficiency
Mitigation: Quality control of insulation coating, proper handling to prevent damage, thermal monitoring
Trigger: Mechanical stress during assembly
Failure: Distorted magnetic path, increased noise, reduced performance
Mitigation: Precision stacking equipment, controlled clamping force, alignment verification
Trigger: Core saturation from overvoltage
Failure: Excessive heating, waveform distortion, potential insulation failure
Mitigation: Proper transformer sizing, voltage regulation, saturation detection circuits

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1mm on lamination dimensions, ±2% on stacking height, angular tolerance ±0.5°
Test Method
Epstein frame test for core loss, permeability measurement, insulation resistance test, dimensional verification, visual inspection for defects

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

Related Components

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A precision rotating shaft in transformer winding machines that holds and rotates the coil form during wire winding operations.

Frequently Asked Questions

Why are transformer cores laminated instead of solid?

Lamination reduces eddy current losses by breaking the path for circulating currents. Solid cores would experience significant energy loss as heat due to induced eddy currents from alternating magnetic fields.

What materials are used for laminated cores?

Primarily electrical steel (silicon steel) with 2-4.5% silicon content. The silicon increases electrical resistivity and reduces hysteresis losses. The sheets are coated with insulation to prevent electrical contact between layers.

How does lamination thickness affect performance?

Thinner laminations (0.23mm) reduce eddy current losses more effectively but increase manufacturing cost. Thicker laminations (0.35mm) are more economical but have slightly higher losses. The choice depends on frequency and efficiency requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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