Yoke: Flatness ≤0.05mm, Coercivity ≤80 A/m

Component Specifications

Definition

The yoke is a ferromagnetic component in electromagnetic relays that serves as the stationary part of the magnetic circuit. It connects the electromagnet core to the armature, providing a low-reluctance path for magnetic flux. This component ensures efficient magnetic field transfer, structural stability, and proper alignment of moving parts within the relay assembly.

Working Principle

When the relay coil is energized, it creates a magnetic field that flows through the yoke, completing the magnetic circuit between the electromagnet and armature. The yoke's ferromagnetic material concentrates and directs this magnetic flux, creating sufficient magnetic force to attract the armature and close or open electrical contacts.

Materials

Low-carbon electrical steel (typically 1008, 1010 grades), silicon steel (M-19, M-22), or soft magnetic composites. Material thickness: 0.5-2.0mm. Surface treatment: zinc plating, nickel plating, or phosphate coating for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	≤0.05mm
Coercivity	≤80 A/m
Surface Roughness	Ra 1.6-3.2 μm
Dimensions Tolerance	±0.1mm
Magnetic Permeability	≥2000 μr
Electrical Resistivity	20-50 μΩ·cm
Saturation Flux Density	1.5-2.0 T

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61810-1, DIN EN 61810-1

Parent Products

This component is used in the following industrial products

Electromagnetic Relay

An electromechanical switching device that uses an electromagnet to mechanically operate contacts, enabling control of high-power circuits with low-power signals.

View Product Details

Cross/Yoke Assembly

The central rotating component of a universal joint that transmits torque between shafts at varying angles.

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Engineering Analysis

Risks & Mitigation

Magnetic saturation leading to reduced efficiency
Corrosion affecting magnetic properties
Mechanical deformation causing misalignment
Residual magnetism affecting release time

FMEA Triads

Trigger: Material impurities or improper heat treatment
Failure: Reduced magnetic permeability and increased hysteresis loss
Mitigation: Implement material certification and controlled annealing processes

Trigger: Poor surface finish or coating defects
Failure: Corrosion leading to increased magnetic reluctance
Mitigation: Apply proper protective coatings and implement quality inspection

Trigger: Dimensional inaccuracies in manufacturing
Failure: Air gaps causing flux leakage and reduced magnetic force
Mitigation: Maintain tight tolerances and implement precision machining

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm for critical dimensions, ±0.05mm for mating surfaces

Test Method

Magnetic flux density measurement using gaussmeter, dimensional verification with CMM, coating thickness measurement per ISO 2178

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 Yoke

Manufacturer profiles associated with Yoke.

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Frequently Asked Questions

What is the primary function of a yoke in an electromagnetic relay?

The yoke completes the magnetic circuit between the electromagnet and armature, providing a low-reluctance path for magnetic flux to ensure efficient operation and structural stability.

Why is electrical steel commonly used for yoke manufacturing?

Electrical steel offers high magnetic permeability, low hysteresis loss, and good mechanical strength, making it ideal for efficient magnetic flux conduction while maintaining structural integrity.

How does yoke design affect relay performance?

Proper yoke design minimizes magnetic reluctance, reduces flux leakage, ensures precise armature alignment, and affects response time, holding force, and overall relay efficiency.

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.

Yoke