Rotor Core/Lamination: Outer Diameter 50-500 mm

Component Specifications

Definition

A rotor core, also called rotor lamination, is the central rotating component in electric machines that consists of thin, insulated steel sheets stacked and bonded together to form a cylindrical core. It serves as the magnetic flux carrier and mechanical support for rotor windings or permanent magnets, minimizing eddy current losses through its laminated construction while providing structural integrity under high rotational speeds and electromagnetic forces.

Working Principle

The rotor core operates on electromagnetic induction principles. When subjected to a rotating magnetic field from the stator, the laminated steel core channels magnetic flux efficiently, inducing torque in wound rotors or interacting with permanent magnets. The laminations (typically 0.35-0.65mm thick) are insulated with oxide or coating to reduce eddy currents, while the stacked design provides mechanical strength and thermal stability during operation.

Materials

Cold-rolled non-oriented silicon steel (CRNGO) grades like M250-35A, M400-50A; thickness 0.35mm, 0.5mm, or 0.65mm; insulation coating: C-5 organic, C-6 inorganic, or hybrid coatings; stacking adhesive: epoxy, welding, or interlocking.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Core Loss	2.5-8.0 W/kg at 1.5T/50Hz
Stack Height	20-300 mm
Material Grade	M250-35A to M800-65A
Outer Diameter	50-500 mm
Stacking Factor	0.95-0.98
Lamination Thickness	0.35-0.65 mm
Insulation Resistance	>100 Ω·cm²

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 16834, IEC 60404-8-4, DIN EN 10106

Parent Products

This component is used in the following industrial products

Rotor

The rotating component of a position encoder/resolver that generates or modulates the signal used to determine angular position.

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Engineering Analysis

Risks & Mitigation

Magnetic saturation
Eddy current overheating
Mechanical deformation at high speeds
Insulation breakdown
Corrosion in harsh environments

FMEA Triads

Trigger: Poor lamination insulation
Failure: Increased eddy currents leading to overheating and efficiency loss
Mitigation: Use certified insulation coatings and maintain coating integrity during stamping

Trigger: Inadequate stacking pressure
Failure: Core vibration and noise during operation
Mitigation: Implement controlled stacking processes with proper bonding/adhesive application

Trigger: Material impurities or incorrect grade
Failure: Reduced magnetic performance and premature saturation
Mitigation: Verify material certifications and implement incoming material inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm on diameter, ±0.1mm on stack height, angular alignment within 0.5°

Test Method

Magnetic testing per IEC 60404-2, dimensional inspection with CMM, insulation resistance testing per ASTM D149

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

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Manufacturers of Rotor Core/Lamination

Manufacturer profiles associated with Rotor Core/Lamination.

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Frequently Asked Questions

Why are rotor cores laminated instead of solid?

Laminations reduce eddy current losses by insulating thin steel sheets, improving efficiency and reducing heating in AC machines.

What materials are used for rotor laminations?

Non-oriented silicon steel is standard due to its high magnetic permeability and low core loss, with thicknesses typically 0.35mm or 0.5mm.

How are rotor laminations assembled?

Sheets are stamped, coated, stacked precisely, and bonded using adhesives, welding, or interlocking features, then machined to final dimensions.

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.

Rotor Core/Lamination