Magnetic Yoke/Frame: Core Loss <2.5 W/kg at 1.0T, 60Hz

Q: What is the primary function of a magnetic yoke in permanent magnet assemblies?

The magnetic yoke serves two main functions: providing a low-reluctance path for magnetic flux to enhance field strength and uniformity, and offering mechanical support and alignment for permanent magnets within the assembly.

Q: What materials are commonly used for manufacturing magnetic yokes?

Common materials include low-carbon steel, silicon steel (electrical steel), pure iron, soft magnetic composites, and nickel-iron alloys. Selection depends on required magnetic properties like permeability, saturation flux density, and core losses.

Q: How does yoke design affect magnetic performance?

Yoke design significantly impacts magnetic circuit efficiency. Proper geometry minimizes flux leakage, reduces magnetic reluctance, and concentrates flux in target air gaps. Design factors include cross-sectional area, material thickness, and geometric configuration relative to magnet placement.

Component Specifications

Definition

The magnetic yoke or frame is a critical structural component in permanent magnet assemblies that serves dual functions: it provides a low-reluctance path for magnetic flux to enhance field strength and uniformity, while also offering mechanical support and alignment for permanent magnets and other assembly elements. Typically made from ferromagnetic materials, it completes the magnetic circuit by connecting opposite poles of magnets, concentrating magnetic fields in designated air gaps for applications like motors, generators, sensors, and magnetic separation systems.

Working Principle

Operates on electromagnetic principles by providing a high-permeability path for magnetic flux lines. When integrated with permanent magnets, the yoke directs and concentrates magnetic flux through its ferromagnetic structure, minimizing flux leakage and increasing magnetic field density in target areas. This creates a closed magnetic circuit where flux circulates efficiently from the north pole of magnets through the yoke to the south pole, enhancing overall magnetic performance and stability.

Materials

Low-carbon steel (AISI 1008-1010), silicon steel (M-19, M-36 grades), electrical steel, pure iron (Armco iron), soft magnetic composites (SMC), or nickel-iron alloys (Permalloy). Materials selected based on permeability, saturation flux density, coercivity, and core loss requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Core Loss	<2.5 W/kg at 1.0T, 60Hz
Coercivity	<100 A/m
Mechanical Strength	250-400 MPa yield strength
Magnetic Permeability	500-5000 μr
Operating Temperature	-40°C to 150°C
Electrical Resistivity	10-50 μΩ·cm
Saturation Flux Density	1.5-2.0 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 683-17, DIN EN 10106, IEC 60404-8-7, ASTM A848

Parent Products

This component is used in the following industrial products

Permanent Magnet Assembly

A magnetic field generation component within electromagnetic vibration testing equipment

View Product Details

Engineering Analysis

Risks & Mitigation

Magnetic saturation leading to performance degradation
Corrosion in humid environments
Mechanical deformation under stress
Eddy current losses at high frequencies
Thermal demagnetization at elevated temperatures

FMEA Triads

Trigger: Insufficient cross-sectional area
Failure: Magnetic saturation, reduced flux density
Mitigation: Design with adequate material thickness based on flux calculations, use materials with higher saturation flux density

Trigger: Poor material selection
Failure: Excessive core losses, heating
Mitigation: Select appropriate electrical steel grades with low hysteresis and eddy current losses for application frequency

Trigger: Inadequate corrosion protection
Failure: Material degradation, increased magnetic reluctance
Mitigation: Apply protective coatings (phosphate, epoxy, nickel plating), use corrosion-resistant alloys in harsh environments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance ±0.1mm for critical surfaces, flatness within 0.05mm, perpendicularity within 0.1°

Test Method

Magnetic properties tested per IEC 60404-2 using Epstein frame or single sheet tester, dimensional verification with CMM, surface inspection per ISO 8501

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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Manufacturers of Magnetic Yoke/Frame

Manufacturer profiles associated with Magnetic Yoke/Frame.

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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 a magnetic yoke in permanent magnet assemblies?