Moving Core: Stroke Length 2-50 mm, Operating Force 5-500 N

Component Specifications

Definition

A moving core, also known as an armature or plunger, is the central movable component within electromagnetic actuators (solenoids, relays, valves). It typically consists of ferromagnetic material that responds to electromagnetic fields generated by a coil. When energized, magnetic forces cause the core to move linearly or rotationally, transmitting mechanical force to connected mechanisms. This component is critical for precise positioning, force application, and motion control in industrial automation systems.

Working Principle

Operates on electromagnetic induction principles: when electric current flows through the surrounding coil, it creates a magnetic field that attracts or repels the ferromagnetic core. The core's movement is proportional to the current magnitude and direction, allowing controlled linear or rotary displacement. In AC systems, the core may vibrate at the frequency of the alternating current, while DC systems provide steady-state positioning.

Materials

Typically made from soft magnetic materials like low-carbon steel (AISI 1008-1010), silicon steel laminations (for AC applications), or specialized alloys (permalloy, ferrite). Surface treatments include zinc plating, nickel coating, or phosphate coating for corrosion resistance. High-performance variants use sintered iron powder cores or laminated stacks to reduce eddy current losses.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Response Time	<10 ms
Stroke Length	2-50 mm
Coil Resistance	10-1000 Ω
Operating Force	5-500 N
Insulation Class	Class B (130°C) or higher
Durability Cycles	>10 million cycles
Operating Temperature	-20°C to +120°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 4401, DIN 24342, ISO 5599-1, IEC 60034

Parent Products

This component is used in the following industrial products

Actuator Element

Individual functional unit within an actuator array that converts control signals into mechanical motion or force.

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Engineering Analysis

Risks & Mitigation

Magnetic saturation leading to reduced efficiency
Mechanical binding due to misalignment
Overheating from excessive current
Corrosion in humid environments
Residual magnetism causing sticking

FMEA Triads

Trigger: Material fatigue from cyclic loading
Failure: Core fracture or permanent deformation
Mitigation: Use fatigue-resistant alloys, implement stress relief heat treatments, and design with safety factors >2

Trigger: Contamination entering actuator housing
Failure: Increased friction and binding
Mitigation: Install protective seals, use filtered air systems, and implement regular maintenance schedules

Trigger: Electrical overstress from voltage spikes
Failure: Demagnetization or insulation breakdown
Mitigation: Incorporate surge protection devices, implement current limiting circuits, and use higher insulation class materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm for critical dimensions, surface roughness Ra ≤ 1.6 μm

Test Method

Magnetic flux density testing per IEC 60404-8, mechanical endurance testing per ISO 19973, 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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Moving Core

Manufacturer profiles associated with Moving Core.

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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

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Frequently Asked Questions

What causes moving core wear in actuators?

Wear results from mechanical friction, magnetic hysteresis losses, corrosion, and thermal expansion mismatches. Proper lubrication, material selection, and alignment reduce wear.

How to select moving core material for high-frequency applications?

Use laminated silicon steel or ferrite cores to minimize eddy current losses and heating at frequencies above 60 Hz.

Can moving cores be customized for specific force requirements?

Yes, cores can be designed with varying diameters, lengths, and material grades to achieve precise force-stroke characteristics.

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.

Moving Core