INDUSTRY COMPONENT

Back Iron

Back Iron is a ferromagnetic component in linear motors that enhances magnetic flux density and structural stability.

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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
  • 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
Standards
ISO 14887, DIN 17405, IEC 60404-8-7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Back Iron.

back iron linear motor component magnetic return path mover forcer electromagnetic flux motor efficiency industrial automation Back Iron in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.6 / 5.0 (30 reviews)

"Testing the Back Iron now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Back Iron meets all ISO standards."

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Frequently Asked Questions

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.

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.

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Back Ferrule (if dual ferrule design) Back Plate