Field Magnet: Coercivity ≥ 800 kA/m

Component Specifications

Definition

A field magnet is a critical electromagnetic component within vibration exciter units that establishes a consistent magnetic field required for converting electrical energy into mechanical vibration. In industrial applications, it typically consists of high-grade magnetic materials arranged in specific configurations to optimize flux density and directional stability. This component works in conjunction with armatures or moving coils to generate controlled oscillatory forces through electromagnetic induction principles.

Working Principle

The field magnet operates by establishing a fixed magnetic field within the vibration exciter's electromagnetic circuit. When alternating current passes through the armature coil positioned within this field, it creates a varying electromagnetic force according to Lorentz's law (F = BIL). This force causes mechanical displacement proportional to the current's amplitude and frequency, generating controlled vibrations. Permanent magnet versions maintain constant field strength, while electromagnet versions allow adjustable field intensity through DC excitation control.

Materials

High-grade neodymium iron boron (NdFeB) magnets (N35-N52 grade), samarium cobalt (SmCo) for high-temperature applications, or laminated silicon steel cores with copper windings for electromagnet versions. Protective coatings include nickel-copper-nickel (Ni-Cu-Ni) plating or epoxy resin encapsulation for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	0.5-15 kg depending on application
Coercivity	≥ 800 kA/m
Dimensions	Customizable per exciter design
Field Uniformity	±5% across working gap
Magnetic Flux Density	0.8-1.5 Tesla
Operating Temperature	-40°C to +150°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 19453-2, DIN EN 60529, IEC 60034

Parent Products

This component is used in the following industrial products

Vibration Exciter Unit

A component that generates controlled mechanical vibrations for product testing and validation in a Quality Testing Station.

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Engineering Analysis

Risks & Mitigation

Magnetic field interference with nearby equipment
Demagnetization at high temperatures
Corrosion in humid environments
Mechanical fatigue from continuous vibration

FMEA Triads

Trigger: Thermal overload exceeding Curie temperature
Failure: Partial or complete demagnetization
Mitigation: Install temperature sensors with automatic shutdown at 80% of maximum operating temperature, use high-temperature grade magnets (SmCo) for demanding applications

Trigger: Mechanical stress from vibration transmission
Failure: Magnet cracking or delamination
Mitigation: Implement shock-absorbing mounting systems, use encapsulated magnet designs, conduct regular visual inspections for cracks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Magnetic flux density tolerance ±3%, dimensional tolerance IT7 grade, axial alignment within 0.1mm

Test Method

Gauss meter measurement per ISO 2178, thermal cycling test per IEC 60068-2-14, vibration endurance test per ASTM D3580

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 Field Magnet

Manufacturer profiles associated with Field Magnet.

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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 difference between permanent and electromagnetic field magnets in vibration exciters?

Permanent magnets provide constant field strength without power consumption but offer fixed intensity. Electromagnets allow adjustable field strength through DC current control but require continuous power and cooling systems. Permanent magnets are preferred for stable frequency applications, while electromagnets suit variable amplitude requirements.

How does field magnet degradation affect vibration exciter performance?

Magnet degradation reduces magnetic flux density, decreasing force output and causing inconsistent vibration amplitudes. This leads to inaccurate test results, reduced system efficiency, and potential resonance shifts. Regular flux testing and thermal monitoring are recommended for maintenance.

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.

Field Magnet