Interlamination Insulation: Thickness 3-8 μm

Component Specifications

Definition

Interlamination insulation is a critical component in electric motor stator lamination stacks, consisting of thin insulating coatings or films applied between individual steel laminations. Its primary function is to electrically isolate each lamination to prevent the formation of circulating eddy currents within the stator core, which would otherwise cause significant energy losses, heat generation, and reduced motor efficiency. This insulation ensures optimal magnetic flux distribution while maintaining structural integrity under thermal and mechanical stresses during motor operation.

Working Principle

Works by creating a high-resistance barrier between conductive steel laminations, blocking the path for eddy currents induced by alternating magnetic fields. This minimizes core losses (hysteresis and eddy current losses) and improves motor efficiency by allowing magnetic flux to pass through while preventing electrical conduction between layers.

Materials

Typically composed of organic coatings (epoxy, polyester, phenolic resins), inorganic coatings (phosphate, chromate), or composite films. Common specifications include thermal class ratings (Class F: 155°C, Class H: 180°C), dielectric strength (>100 V/μm), and thickness (2-10 μm).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	3-8 μm
Thermal Class	Class F (155°C)
Adhesion Strength	>10 MPa
Surface Resistance	>10^9 Ω
Dielectric Strength	>120 V/μm
Operating Temperature	-40°C to 180°C

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 2178, IEC 60034-18-21, ASTM D149

Parent Products

This component is used in the following industrial products

Electric Motor Stator Lamination Stack

Precisely stacked and bonded electrical steel laminations forming the stationary magnetic core of an electric motor.

View Product Details

Electrical Steel Lamination Core

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

View Product Details

Engineering Analysis

Risks & Mitigation

Insulation degradation due to thermal cycling
Mechanical damage during assembly
Chemical corrosion from coolants

FMEA Triads

Trigger: Overheating beyond thermal class rating
Failure: Insulation breakdown and shorting between laminations
Mitigation: Use higher thermal class materials and implement temperature monitoring

Trigger: Poor coating application or contamination
Failure: Incomplete insulation coverage leading to localized eddy currents
Mitigation: Implement quality control with dielectric testing and visual inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Coating thickness ±1 μm, coverage >99%

Test Method

Dielectric strength test per IEC 60243, thermal cycling per IEC 60068-2-14

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Interlamination Insulation

Manufacturer profiles associated with Interlamination Insulation.

Sourcing Interlamination Insulation from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Marking Strip

A durable marking strip used for terminal identification in motor terminal blocks to ensure proper electrical connections and safety compliance.

Gland Body

A gland body is the main housing component of an aluminum cable gland that provides mechanical protection and environmental sealing for electrical cables entering enclosures.

Current Sense Resistor

A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.

Conductor Terminal

A conductor terminal is a critical electrical component designed to securely connect and terminate conductors in high-voltage insulating bushings, ensuring reliable electrical transmission and insulation integrity.

Frequently Asked Questions

What happens if interlamination insulation fails?

Failure leads to increased eddy currents, causing higher core losses, overheating, reduced motor efficiency, and potential thermal damage to windings.

Can interlamination insulation be repaired?

No, damaged insulation typically requires replacement of affected laminations or the entire stator stack, as coatings cannot be reapplied in situ.

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.

Interlamination Insulation