OEM Permanent Magnet Type Manufacturers & Companies

Precision rare-earth magnetic designs engineered for high-performance motor assemblies, automotive EPS systems, and industrial automation solutions worldwide.

Premium OEM Magnetic Systems & Custom Magnets

Explore our state-of-the-art permanent magnet products, meticulously engineered for structural integrity, coercive retention, and extreme climate applications.

NdFeB Pot Magnet Style A with nickel coating

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Custom NdFeB Hook Magnet - Super Strong Magnetic Hook

Custom NdFeB Hook Magnet - Super Strong Hook

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OEM NdFeB Arc Segment - Strong Motor Magnets

OEM NdFeB Arc Segment for Generators & Rotors

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Wholesale NdFeB Hook Magnet - Powerful hanging hook

Wholesale NdFeB Hook Magnet - Industrial Grade

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Wholesale Neodymium magnets for automotive EPS

Neodymium Magnets for Automotive EPS Systems

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Strong Magnet Neodymium Magnetic Materials

Strong Neodymium Raw Magnetic Materials

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Custom NdFeB Rubber Coated Magnets

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Permanent Rare Earth Disc Neodymium Magnets

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Executive Summary: Pioneering Magnetics Technology

In the modern industrial landscape, permanent magnet technology serves as the foundation for the global shift toward electrification, automated industrial tooling, and renewable energy conversion. The select application of custom-engineered Sintered Neodymium-Iron-Boron (NdFeB) composites has revolutionized operational performance parameters. As an industry leader, Zhejiang Laysun Magnetics Ltd. has spent over two decades developing high-performance magnetic assemblies that satisfy the stringent mechanical and thermal demands of international OEMs.

Operating from our advanced manufacturing facility in Suining, Sichuan, spanning a massive 100,000 square meters, we maintain a highly specialized workforce of 300+ engineering professionals. Our manufacturing setup translates to an annual capacity of 5,000 tons of premium rare earth magnets. From electric power steering (EPS) systems in high-end automotive assemblies to high-torque voice coil motors (VCM) for computing architectures, Laysun Magnetics configures proprietary material compounds tailored to our partners' exact environmental needs.

A Strategic History of Growth and Technical Sophistication

Established in 1999, Zhejiang Laysun Magnetics Ltd. has built a track record of innovation from a regional technical startup to a key global player in high-coercivity magnet production. The transition from general-purpose sintered NdFeB manufacturing to high-density, grain-boundary diffused (GBD) magnets represents our long-term commitment to research and development. In high-efficiency permanent magnet motors, managing demagnetization factors under high thermal loads is critical; our specialized materials withstand temperatures up to 220°C without significant structural flux loss.

25+

Years of Industry Expertise

100,000m²

Modern Factory Infrastructure

300+

Specialist Operators & Engineers

5,000Tons

Annual Rare Earth Magnet Output

Global Industrial Infrastructure & Sintering Operations

Take a look inside our high-tech sintering facilities, vacuum induction furnaces, and automatic precision slicing plants.

Zhejiang Laysun Magnetics Factory Sintering Unit

Laysun Magnetics Raw Sintered Neodymium Stock

Strategic Advantages of Laysun Magnetics

Our operations are defined by four main values: Quality, Credibility, Technology, and Continuous Innovation.

Advanced Manufacturing

Utilizing high-vacuum induction melting furnaces and advanced inert gas jet milling processes to ensure uniform particle size distributions below 4μm.

IATF 16949 / ISO Audited

Our Quality Management System meets strict automotive standards. We conduct complete non-destructive flux testing and precise dimensional checks on every batch.

Global Logistics & Support

Headquartered in Hangzhou, China, with specialized global logistics channels that guarantee prompt container deliveries and door-to-door customs clearance.

Macro-Industry Solutions & Global Applied Engineering

We partner with leading engineering firms to supply advanced permanent magnetic circuits across high-growth industrial sectors.

Industrial Robotics

High-torque-density, multi-pole NdFeB ring magnets for robotic joint servo motor actuators requiring precise angular positioning.

Drone Propulsion

Lightweight NdFeB arc segments designed for outer-rotor brushless motors, optimized for maximum power-to-weight ratios.

Electric Vehicles (EVs)

High-coercivity sintered block magnets used in traction motors and EPS systems to reduce losses at high operating temperatures.

Power Tools

Durable, impact-resistant magnetic segments that stand up to high vibrational forces in cordless tools and brushless drills.

Consumer Electronics

Sub-millimeter micro disc and ring magnets for smartphones, audio speaker systems, and magnetic wireless chargers.

Home Appliances

Energy-efficient permanent magnet solutions for inverter compressors in air conditioners, washing machines, and smart home appliances.

Technical Monograph: Materials Engineering in Sintered NdFeB

Modern engineering relies on optimizing magnetic flux density and magnetic field stability under load. Sintered Neodymium-Iron-Boron (NdFeB) features a tetragonal crystalline structure of Nd₂Fe₁₄B, which provides very high uniaxial magnetocrystalline anisotropy. This allows for high saturation magnetization ($J_s \approx 1.6 \, \text{T}$) and high energy product ($BH_{\text{max}}$ up to $55 \, \text{MGOe}$).

1. Anti-Corrosion Surface Treatements & Coating Technologies

Because of the high chemical activity of the neodymium-rich phase at grain boundaries, NdFeB is naturally prone to oxidation. We address this issue by applying multilayer galvanic coatings and specialized barrier laminations:

Nickel-Copper-Nickel (Ni-Cu-Ni): A triple-layer metallic coating that protects against ambient humidity. This coating provides excellent resistance to corrosion and is suitable for most general industrial applications.
Epoxy Resin Coating: Provides a robust chemical barrier against salt spray, high humidity, and weak acid exposure. It also offers electrical insulation up to 500V.
Rubber Coated Assemblies (Santoprene): An elastomeric barrier that provides high friction coefficients, prevents surface scratching, and protects the internal brittle magnet from physical impacts.
Zinc (Zn) plating: An economical option for applications that are protected from direct exposure to corrosive agents.

Engineering Breakthrough: Grain Boundary Diffusion (GBD)

By diffusing heavy rare earth elements (specifically Dysprosium, Dy, or Terbium, Tb) along the crystalline grain boundaries, we increase the magnet's intrinsic coercivity ($H_{cj}$). This process reduces the use of expensive heavy rare earth metals inside the core grains, helping to lower production costs while maintaining high magnetic performance.

2. Thermal Stability Grades & Structural Engineering

As operating temperatures increase, the magnet's remanence ($B_r$) and coercivity ($H_{cj}$) experience reversible losses. If temperatures exceed the material's maximum operating threshold, irreversible thermal demagnetization occurs. We manufacture a wide range of magnetic grades designed for these demanding conditions:

Grade Classification	Remanence (Br)	Coercivity (Hcj)	Max. Operating Temp
N Series (N35 - N52)	1.17 - 1.48 T	≥ 12 kOe	80 °C
M Series (35M - 50M)	1.15 - 1.43 T	≥ 14 kOe	100 °C
H Series (35H - 48H)	1.13 - 1.38 T	≥ 17 kOe	120 °C
SH Series (33SH - 45SH)	1.10 - 1.34 T	≥ 20 kOe	150 °C
UH Series (30UH - 40UH)	1.08 - 1.25 T	≥ 25 kOe	180 °C
EH Series (30EH - 38EH)	1.04 - 1.20 T	≥ 30 kOe	200 °C

Verified International Certifications & Testing Compliance

We maintain certifications to meet global regulatory and commercial quality standards across industries.

API 6D | API 607 | CE | ISO 9001 | ISO 14001 | ISO 18001 | IATF 16949 / TS

Environmental Responsibility & Carbon Neutrality Goals

Zhejiang Laysun Magnetics Ltd. complies with current RoHS and REACH standards. We use clean energy sources and operate closed-loop recycling processes for our wastewater, helping to minimize environmental impact during the chemical extraction and machining of neodymium elements.

Industry & Material FAQ: Sintered Rare Earth Magnets

Read technical answers to common engineering questions regarding NdFeB material properties, selection, and customization.

What causes irreversible thermal demagnetization in high-grade NdFeB magnets?

Irreversible thermal demagnetization occurs when the magnet is heated beyond its maximum operating temperature limit. Thermal energy disrupts the alignment of the magnetic domains within the crystal structure. Once this temperature threshold is passed, the magnetic domains lose their alignment, resulting in a permanent loss of flux that cannot be recovered without remagnetizing the material.

How do you select the correct coating for subsea or marine applications?

For marine or high-moisture environments, standard nickel plating is usually insufficient because pinhole defects can allow salt water to penetrate. We recommend rubber-coated (Santoprene) magnets or stainless steel encapsulation. These options provide a durable barrier that protects the inner neodymium core from corrosive salt spray.

Why is Grain Boundary Diffusion (GBD) preferred over traditional alloy mixing?

GBD concentrates heavy rare earths (Dysprosium or Terbium) at the boundaries between the crystal grains, rather than distributing them throughout the entire grain structure. This selectively increases the magnet's coercivity (resistance to demagnetization) while preserving high remanence (magnetic field strength) in the core, all while reducing material costs.

What are the lead times and minimum order quantities (MOQ) for custom OEM orders?

Lead times range from 15 to 25 days depending on the complexity of the shape, tooling requirements, and the selected coating. MOQ varies depending on the size of the magnet, but typically starts at 1,000 units for standard custom shapes.

Heavy-Duty Industrial Magnetic Assemblies

Explore our line of magnetic lifters, high-capacity holding pots, specialized fishing magnets, and automotive sensor rings.

China NdFeB Magnet Lifter - 1000KG Capacity

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China NdFeB Fishing Magnet for Retrieving

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Super Strong Custom Ring Neodymium Magnet

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OEM Neodymium Magnets for Voice Coil Motors

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Cheap NdFeB Magnetic Badge - Reusable IDs

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China Neodymium Pin Magnet - Plastic/Nickel

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OEM Sintered Neodymium NdFeB Block Magnet

Sintered NdFeB Block Magnet for EV Motors

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Magnet Circle For Magnetic Ring For Phone

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