Magnet segments: Remanence 1.0-1.4 T, Coercivity 10-30 kOe

Component Specifications

Definition

Magnet segments are specialized permanent magnet components, typically manufactured from rare-earth materials like neodymium-iron-boron (NdFeB) or samarium-cobalt (SmCo), that are precisely shaped and arranged in drive magnet assemblies. These segments create specific magnetic field patterns essential for converting electrical energy into mechanical motion in motors, actuators, and other electromagnetic devices. Their geometric configuration, magnetization direction, and material properties are critical for achieving optimal torque, efficiency, and positional accuracy in industrial machinery.

Working Principle

Magnet segments operate based on the principles of electromagnetism and permanent magnetism. When integrated into a drive magnet assembly, they establish a static magnetic field that interacts with alternating currents in nearby coils or windings. This interaction generates Lorentz forces that produce rotational or linear motion. The segments are arranged to create sinusoidal or trapezoidal magnetic flux distributions, which determine the motor's performance characteristics including torque ripple, speed control, and efficiency.

Materials

Primary materials: Neodymium Iron Boron (NdFeB) grades N35-N52, Samarium Cobalt (SmCo) grades 1:5 and 2:17, or Ferrite (SrFe12O19/CaFe12O19). Coatings: Nickel (Ni), Zinc (Zn), Epoxy, or Parylene for corrosion protection. Operating temperature range: -40°C to +200°C depending on grade. Maximum energy product (BHmax): 25-55 MGOe for NdFeB, 16-32 MGOe for SmCo.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Remanence	1.0-1.4 T
Tolerance	±0.05mm to ±0.2mm
Coercivity	10-30 kOe
Dimensions	Customized per application (typical: 10-100mm arc length, 5-50mm width, 2-20mm thickness)
Magnetization	Radial, parallel, or multi-pole
Surface Field	2000-5000 Gauss

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/TS 16949, IEC 60404-8-1, ASTM A977/A977M

Parent Products

This component is used in the following industrial products

Drive magnet assembly

The magnetic component within a magnetic coupling that transmits torque from the drive side to the driven side through magnetic fields.

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Engineering Analysis

Risks & Mitigation

Demagnetization at high temperatures
Corrosion in humid environments
Mechanical brittleness and chipping
Magnetic field interference with nearby equipment
Inconsistent magnetization affecting performance

FMEA Triads

Trigger: Exposure to temperatures above maximum operating limit
Failure: Partial or complete demagnetization
Mitigation: Implement temperature monitoring systems, use higher temperature grade materials (SmCo), and design proper cooling mechanisms

Trigger: Improper handling during assembly
Failure: Physical damage or chipping of magnet edges
Mitigation: Use specialized non-magnetic tools, implement proper handling procedures, and apply protective coatings

Trigger: Inconsistent magnetization during manufacturing
Failure: Uneven torque output and increased vibration
Mitigation: Implement quality control checks using gauss meters, ensure proper magnetization fixture alignment, and conduct sample testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-mK, magnetic properties within ±5% of specified values

Test Method

Gauss meter measurement for surface field, coordinate measuring machine (CMM) for dimensional verification, salt spray testing per ASTM B117 for corrosion resistance, thermal cycling tests per IEC 60068-2-14

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 Magnet segments

Manufacturer profiles associated with Magnet segments.

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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 are the main applications of magnet segments in industrial settings?

Magnet segments are primarily used in brushless DC motors, servo motors, linear actuators, and precision positioning systems across industries including robotics, automotive manufacturing, aerospace, and industrial automation.

How do magnet segments differ from complete magnet rings?

Magnet segments allow for more flexible design configurations, better heat dissipation, and easier assembly compared to single-piece magnet rings. They enable precise control of magnetic field distribution and can be arranged in various pole configurations.

What factors determine the choice between NdFeB and SmCo magnet segments?

NdFeB offers higher magnetic strength and is more cost-effective for temperatures below 150°C. SmCo provides better temperature stability (up to 350°C) and corrosion resistance but is more expensive. The choice depends on operating temperature, budget, and environmental conditions.

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.

Magnet segments