Back Iron: Core Loss <3.0 W/kg @ 1.5T, 400Hz

Q: What is the primary function of Back Iron in linear motors?

The Back Iron serves as a magnetic return path that concentrates flux, enhances force density, and provides structural support to the moving element in linear motor systems.

Q: Why are laminations used in Back Iron construction?

Laminated electrical steel reduces eddy current losses by interrupting current paths, improving efficiency especially at higher frequencies in linear motor applications.

Q: How does Back Iron affect linear motor performance?

Proper Back Iron design increases force density by 15-30%, reduces cogging forces, improves thermal management, and extends operational lifespan through reduced magnetic saturation.

Component Specifications

Definition

The Back Iron is a critical component in linear motor systems, specifically in Mover/Forcer assemblies. It serves as a magnetic return path, concentrating and directing magnetic flux from permanent magnets or electromagnets to optimize force generation and efficiency. This component provides structural rigidity to the moving element while minimizing magnetic leakage and eddy current losses.

Working Principle

The Back Iron operates on electromagnetic principles, completing the magnetic circuit in linear motors. When current flows through windings, it creates magnetic fields that interact with permanent magnets. The Back Iron's high permeability material provides a low-reluctance path, concentrating flux lines to maximize Lorentz force on the mover while maintaining structural integrity during high-speed linear motion.

Materials

Electrical steel (silicon steel laminations), Soft magnetic composites (SMC), or high-permeability alloys like Permendur. Typical specifications: 0.35-0.5mm thickness laminations, silicon content 3-3.5%, core loss <2.5W/kg at 1.5T/50Hz.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Core Loss	<3.0 W/kg @ 1.5T, 400Hz
Surface Finish	Ra 1.6-3.2 μm
Flatness Tolerance	≤0.05mm/100mm
Thermal Conductivity	20-40 W/m·K
Magnetic Permeability	>4000 μr
Operating Temperature	-40°C to 150°C
Saturation Flux Density	1.8-2.0 Tesla

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 14887, DIN 17405, IEC 60404-8-7

Parent Products

This component is used in the following industrial products

Mover/Forcer

The moving component of a linear motor or servo motor that generates mechanical force and motion.

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Engineering Analysis

Risks & Mitigation

Magnetic saturation at high currents
Eddy current heating
Mechanical resonance at high speeds
Corrosion in humid environments
Delamination under thermal cycling

FMEA Triads

Trigger: Insufficient lamination insulation
Failure: Increased eddy current losses leading to overheating
Mitigation: Implement proper interlamination insulation coating and quality control

Trigger: Material impurities in electrical steel
Failure: Reduced magnetic permeability and increased hysteresis losses
Mitigation: Source materials with certified purity levels and implement incoming inspection

Trigger: Improper assembly pressure
Failure: Delamination and reduced structural integrity
Mitigation: Use controlled torque/pressure during assembly with monitoring systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.02mm dimensional, ±0.5° angular alignment, <0.1mm flatness deviation

Test Method

Magnetic flux density measurement (Hall probe), eddy current testing, thermal imaging, vibration analysis per ISO 14887

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

Manufacturers of Back Iron

Manufacturer profiles associated with Back Iron.

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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 is the primary function of Back Iron in linear motors?