Spindle Motor Bonded NdFeB Magnets

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Spindle Motor Bonded NdFeB Magnets

High-precision compression-molded bonded NdFeB ring magnets for HDD, ODD, and precision spindle motor applications. Engineered for multi-pole magnetization, ultra-tight tolerances, and reliable performance at high rotational speeds.

Elite Magnets manufacturing facility

15+
Years Manufacturing

ISO
9001:2015 Certified

100%
Flux Tested

7–14
Day Prototypes

Direct
Factory Pricing

Product Overview

Compression-Molded Bonded NdFeB for Precision Motion

Bonded NdFeB magnets are produced by compression-molding a mixture of NdFeB powder and epoxy resin binder. The process enables near-net-shape production of complex ring geometries with anisotropic powder alignment — delivering uniform flux distributions critical for spindle motor stability at 5,400–15,000 RPM.

  • ✓ Multi-pole magnetization up to 32 poles
  • ✓ ±0.05 mm standard dimensional tolerance
  • ✓ Available in BNP-6 through BNP-12 grades
  • ✓ Ni, Zn, or Epoxy coating options
  • ✓ 100% automated flux density QC testing
  • ✓ ISO 9001:2015 certified manufacturing
Bonded NdFeB ring magnets for spindle motors

How We Make It

Manufacturing Process

Full traceability maintained at every stage. Batch testing records available on request.

1
NdFeB Powder
Isotropic or anisotropic NdFeB base powder

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2
Binder Mixing
Epoxy resin uniformly blended with powder

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3
Compression Molding
Pressed in precision tooling under high force

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4
Curing
Thermal cure for structural integrity

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5
CNC Machining
Precision grinding to final dimensions

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6
Coating
Ni, Zn or Epoxy surface protection

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7
Flux Testing
100% automated Br measurement

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8
Delivery
COA included, DDP/FOB available

Technical Data

Material Grades & Magnetic Properties

All properties measured at 20°C. Contact us for guaranteed minimum specifications.

Grade Br (T) Hcb (kA/m) Hcj (kA/m) (BH)max (kJ/m³) Max Temp (°C)
BNP-6 0.60–0.68 400–480 600–900 48–60 120
BNP-8 0.68–0.75 460–540 700–1000 60–76 120
BNP-10 0.75–0.82 520–600 800–1200 76–96 120
BNP-12 0.82–0.90 580–660 900–1400 96–112 120

Custom grades available. Contact our engineering team for grade selection support.

Specifications

Physical & Dimensional Specifications

Density 5.9–6.1 g/cm³
Hardness Shore D 70–80
Tensile Strength 40–60 MPa
Tolerance (Std) ±0.05 mm
Tolerance (Precision) ±0.02 mm
Available Shapes Ring / Disc / Arc / Custom
Pole Count 2–32 poles
Magnetization Radial / Axial / Multi-pole
Surface Coating Ni-Cu-Ni / Zinc / Epoxy
Compliance RoHS 2.0 / REACH

Geometry

Available Shapes & Magnetization Patterns

Bonded NdFeB magnet shapes

Standard Shapes

Ring · Disc · Arc · Custom profiles. Net-shape molding eliminates secondary machining for most geometries.

Magnetization direction diagrams

Magnetization Patterns

Radial · Axial · Multi-pole up to 32 poles. Custom pole configurations available — share your motor spec.

Industries Served

Applications & Industries

Our spindle motor bonded NdFeB magnets are qualified for demanding rotational applications across multiple industries.

HDD spindle motor application

HDD Spindle Motors

Ultra-precise ring magnets for hard disk drive spindle motors. Supports 5,400–15,000 RPM with minimal cogging torque and axial runout.

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ODD & Blu-ray Drives

Optical disk drive motors requiring flux uniformity for accurate laser tracking and low acoustic noise.

🖨️

Printer & Copier Motors

Brushless DC motors for paper feed, fuser, and scanning mechanisms in high-duty-cycle office equipment.

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Precision Instruments

Gyroscopes, encoders, and measurement devices requiring thermal stability across −40°C to +100°C.

🤖

Robotics & Servo Systems

High pole-count ring magnets for servo motor feedback systems and robotic joint actuators.

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Medical Devices

Miniature spindle motors in surgical drills, dental handpieces, and diagnostic instruments. Biocompatible coating options available.

Our Advantage

Why Source from Elite Magnets?

🏭

Factory Direct

No middlemen. Direct from our ISO-certified compression molding facility. Competitive pricing, transparent lead times.

🔬

100% Flux QC

Every magnet batch tested on automated flux testing equipment. Certificate of Analysis provided with every shipment.

⚡

Fast Prototypes

Prototype magnets in 7–14 working days. We support your R&D timeline from drawing to tested sample.

🌍

Global Logistics

DDP, DAP, FOB available. Export experience to 30+ countries. Customs documentation handled.

Common Questions

Frequently Asked Questions

What is the minimum order quantity?

We accept orders from prototype quantities (as low as 50 pieces) through high-volume production. Pricing scales favorably at 500+ and 5,000+ pieces. Contact us for a tiered pricing sheet.

Can you produce magnets to my exact drawing dimensions?

Yes. We manufacture to customer drawings in PDF, DXF, or STEP formats. Standard shapes ship within 7–14 days after drawing approval; novel geometries may require tooling (lead time 2–3 weeks).

What magnetization patterns are available?

We support axial, radial, and multi-pole diametric magnetization. Pole counts from 2 to 32 poles are standard. Higher pole counts and custom pole configurations are available — share your motor spec and our engineers will advise.

How do you ensure consistency between production batches?

Every production batch undergoes 100% automated flux density testing. We maintain complete batch records (raw material certificates, process parameters, test data) for full traceability. SPC charts available on request.

What surface treatments are available?

Standard options: Ni-Cu-Ni (most common, good corrosion resistance), Zinc (cost-effective), Epoxy resin (chemical resistance, suitable for humid environments), and uncoated. Our engineering team can recommend based on your operating environment.

Ready to Specify Spindle Motor Magnets?

Send us your drawing or specifications. Our engineering team will respond within 24 hours with a technical proposal and competitive pricing.

✓ NDA available
✓ Response within 24 hours
✓ Free DFM review
✓ No obligation