INDUSTRY COMPONENT

Permanent Magnet Block

A permanent magnet block is a precisely manufactured magnetic component used in industrial magnet arrays to generate stable magnetic fields without external power.

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Component Specifications

Definition
A permanent magnet block is a solid, rectangular or cuboidal magnetic component manufactured from hard magnetic materials that retain their magnetization indefinitely. These blocks are engineered with precise dimensions, magnetic orientation, and surface finish to serve as fundamental building blocks in industrial magnet arrays. They generate consistent magnetic flux density across their surfaces and are assembled into arrays to create specific magnetic field patterns for applications like material handling, separation, positioning, and magnetic levitation systems.
Working Principle
Permanent magnet blocks operate based on the intrinsic magnetic properties of hard ferromagnetic materials (like neodymium-iron-boron or samarium-cobalt). These materials have high coercivity and remanence, meaning once magnetized, they maintain a strong magnetic field without external energy input. The blocks are magnetized along specific axes (typically through-thickness or lengthwise) during manufacturing. When arranged in arrays with alternating polarity, they create complex magnetic field patterns through superposition, where the magnetic flux from individual blocks combines to produce the desired field strength and gradient for industrial applications.
Materials
Neodymium-Iron-Boron (NdFeB) N52 grade with nickel-copper-nickel triple-layer coating for corrosion protection. Alternative: Samarium-Cobalt (SmCo) for high-temperature applications up to 350°C. Material specifications include: Remanence (Br): 1.48 T minimum, Coercivity (Hc): ≥1350 kA/m, Maximum Energy Product (BHmax): 52 MGOe, Density: 7.5 g/cm³, Curie Temperature: 310°C for NdFeB.
Technical Parameters
  • Coating Ni-Cu-Ni (10-15μm per layer), epoxy coating optional
  • Tolerance ±0.1mm on critical dimensions, ±0.2mm on non-critical
  • Dimensions Standard sizes: 50x25x10mm, 100x50x20mm, 150x75x30mm (LxWxH)
  • Pull Force 15-150 kg (depending on size and grade)
  • Surface Gauss 4500-5200 Gauss on surface (depending on grade and size)
  • Magnetic Orientation Through-thickness (axis), multi-pole magnetization available
  • Operating Temperature -40°C to +80°C (NdFeB), up to 350°C (SmCo)
Standards
ISO 17554:2014, DIN 17410, IEC 60404-8-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Permanent Magnet Block.

permanent magnet block industrial magnet array NdFeB magnet magnetic component material handling magnet magnetic separation neodymium magnet block magnet array component Permanent Magnet Block in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Magnet Array

A precisely arranged assembly of permanent magnets designed to generate controlled magnetic fields for motion applications.

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Engineering Analysis

Risks & Mitigation
  • Demagnetization from high temperatures
  • Corrosion in humid environments
  • Brittle fracture from mechanical impact
  • Magnetic field interference with sensitive equipment
  • Pinching hazards during handling
FMEA Triads
Trigger: Exposure to temperatures above maximum operating limit
Failure: Partial or complete demagnetization, reduced magnetic performance
Mitigation: Use temperature-resistant grades (SmCo) for high-temperature applications, implement thermal monitoring, design cooling systems for arrays
Trigger: Inadequate corrosion protection in harsh environments
Failure: Surface corrosion leading to material degradation and magnetic property loss
Mitigation: Apply triple-layer Ni-Cu-Ni coating, use epoxy coatings for additional protection, specify stainless steel encapsulation for severe conditions
Trigger: Mechanical stress during assembly or operation
Failure: Cracking or chipping of brittle magnet material
Mitigation: Use proper handling tools, design protective housings, implement controlled assembly processes, avoid impact loading

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerance per ISO 2768-mK, magnetic properties within ±5% of specified values, coating thickness 30-45μm total
Test Method
Gauss meter measurement per IEC 60404-14, dimensional verification with coordinate measuring machine (CMM), coating thickness measurement with eddy current or magnetic induction gauges, pull force testing with calibrated force gauge

Buyer Feedback

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Frequently Asked Questions

What is the difference between through-thickness and lengthwise magnetization?

Through-thickness magnetization means the magnetic poles are on the largest faces (top/bottom), creating maximum surface field. Lengthwise magnetization has poles on the ends, useful for specific array configurations where magnetic fields need to be oriented horizontally.

How do I prevent demagnetization of permanent magnet blocks?

Avoid temperatures above maximum operating limits (80°C for standard NdFeB), strong opposing magnetic fields, mechanical impacts, and corrosive environments. Use appropriate protective coatings and handle with non-magnetic tools during assembly.

Can permanent magnet blocks be customized for specific array designs?

Yes, manufacturers can produce blocks with custom dimensions, magnetization patterns (multi-pole), specific magnetic strengths, and specialized coatings. Tolerance can be tightened to ±0.05mm for precision applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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