Armature Core: Stack Length 100mm to 1000mm

Component Specifications

Definition

The armature core is the central rotating component of an armature assembly in electric motors, generators, and other electromagnetic devices. It consists of thin, insulated laminations stacked together to form a cylindrical or drum-shaped structure, minimizing eddy current losses. The core provides a low-reluctance path for magnetic flux and supports the armature winding, which is wound in slots on its surface. As it rotates within the stator's magnetic field, electromagnetic induction occurs, enabling energy conversion between electrical and mechanical forms. Key functions include reducing hysteresis and eddy current losses through lamination, maintaining structural integrity under rotational forces, and ensuring efficient magnetic coupling.

Working Principle

The armature core operates on electromagnetic induction principles. When placed in a changing magnetic field (typically from the stator), a voltage is induced in the armature winding wound around the core. In motors, current through the winding interacts with the magnetic field to produce torque, causing rotation. The laminated steel construction minimizes energy losses by reducing eddy currents, while the core's high permeability concentrates magnetic flux for efficient energy transfer. Rotation is achieved through commutation (in DC machines) or alternating current phases (in AC machines), with the core's design optimizing magnetic circuit performance and thermal management.

Materials

Electrical steel laminations (typically silicon steel, grades like M-19 or M-36), insulated with a coating (e.g., C-5 or C-6 insulation), stacked and bonded with varnish or welded; high-grade steel for shafts; sometimes alloy steels for high-speed applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stack Length	100mm to 1000mm
Material Grade	M-19, M-36, or equivalent
Core Outer Diameter	50mm to 500mm (varies by application)
Lamination Thickness	0.35mm to 0.65mm
Insulation Resistance	>100 MΩ
Magnetic Flux Density	1.5T to 1.8T
Maximum Operating Temperature	150°C to 200°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 1680, IEC 60034, DIN EN 50347

Parent Products

This component is used in the following industrial products

Armature Assembly

Rotating component of a vibration exciter that converts electrical energy into controlled mechanical vibration through electromagnetic interaction.

View Product Details

Engineering Analysis

Risks & Mitigation

Overheating due to eddy currents or poor insulation
Mechanical failure from imbalance or fatigue
Magnetic saturation reducing efficiency
Corrosion in humid environments

FMEA Triads

Trigger: Insufficient lamination insulation
Failure: Increased eddy current losses leading to overheating and reduced efficiency
Mitigation: Use certified insulation coatings and quality control during lamination stacking

Trigger: Improper balancing during manufacturing
Failure: Vibration and mechanical wear, causing premature failure
Mitigation: Implement dynamic balancing tests and precision machining

Trigger: Excessive magnetic flux density
Failure: Core saturation, reducing torque and efficiency in motors
Mitigation: Design within material limits and use high-grade electrical steel

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm for dimensions, ±0.1mm for concentricity

Test Method

Magnetic flux testing per IEC 60034, insulation resistance testing, dynamic balancing to ISO 1940

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Armature Core

Manufacturer profiles associated with Armature Core.

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Frequently Asked Questions

Why is the armature core laminated?

Lamination reduces eddy current losses by insulating thin steel sheets, improving efficiency and preventing overheating in electric machines.

What materials are used for armature cores?

Electrical steel (silicon steel) is common due to its high magnetic permeability and low hysteresis loss, with insulation coatings to minimize eddy currents.

How does an armature core differ from a stator core?

The armature core rotates and carries the winding in motors/generators, while the stator core is stationary and provides the magnetic field; both are laminated but have different mechanical roles.

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.

Armature Core