Engineered to withstand rigorous thermal, physical, and magnetic limits in high-power setups.
Forging advanced rare earth magnetic materials since 1999.
Zhejiang Laysun Magnetics Ltd. is a national high-tech leader specializing in the development, research, production, and sales of high-performance rare earth NdFeB magnets. Built on over two decades of technical evolution, our facility spans 100,000 square meters in Suining, Sichuan. We deliver 5,000 tons of custom magnetic solutions annually, satisfying strict tolerances and structural integrity criteria for critical applications worldwide.
Our core manufacturing processes feature advanced vacuum induction melting (VIM), strip casting, hydrogen decrepitation (HD), jet milling, and magnetic field alignment compaction under inert atmospheres. These technologies ensure that every block, segment, ring, or customized geometry meets precise design requirements.
Maximizing power density and mechanical efficiency across key industrial fields.
Providing high-coercivity NdFeB arc segments for compact servo motors, hollow-shaft joints, and high-speed robotic grippers requiring minimal weight with maximum torque.
Supplying high-grade NdFeB magnets for main traction motors, active suspension systems, and electronic power steering (EPS) assemblies demanding outstanding thermal stability.
Delivering high-remanence (Br) ring and disc shapes for precision audio drivers, voice coil motors (VCM), smartphone vibration units, and magnetic accessories.
The global demand for high-performance rare earth permanent magnets, particularly sintered Neodymium-Iron-Boron (NdFeB), is growing rapidly. This trend is driven by decarbonization policies, the electrification of transportation, and the transition toward high-efficiency industrial motors (conforming to IE4 and IE5 energy efficiency standards).
Currently, raw material supply security, trace-element optimization, and thermal stability dominate international procurement strategies. Industrial buyers evaluate NdFeB magnets based on magnetic flux density, coercivity ($H_{cj}$), remanence ($B_r$), and maximum energy product ($(BH)_{max}$). These factors directly determine the power density and operational limits of the final motor system.
In high-rpm rotors, rapid magnetic flux changes generate significant eddy current losses, leading to localized heating. If the internal temperature exceeds the design limit, permanent demagnetization occurs. To prevent this, Laysun Magnetics implements Grain Boundary Diffusion (GBD) technology.
This process diffuses Dysprosium (Dy) or Terbium (Tb) selectively into the grain boundaries of the sintered matrix, rather than alloying the entire body. The result is a substantial increase in coercivity without reducing remanence, which is crucial for electric vehicle traction motors operating at temperatures up to 220°C.
Due to the high iron content in NdFeB (nearly 65%), these magnets are inherently susceptible to oxidation. Exposure to industrial moisture, marine environments, or corrosive chemical fumes requires high-integrity surface treatments. Laysun Magnetics offers tailored coatings, including multi-layer Electroplated Nickel-Copper-Nickel (Ni-Cu-Ni), Epoxy Resin barrier coatings, Passivation, and specialized Hermetic Rubber coatings, to ensure long-term stability.
Sintered NdFeB magnets are classified by their maximum energy product and operating temperature limit. The following table provides typical specifications for industrial design engineering:
| Grade Series | Remanence (Br) (kGs) | Coercivity (Hcj) (kOe) | Max Energy Product (BH)max | Max Temp Limit |
|---|---|---|---|---|
| N35 - N52 | 11.7 - 14.8 | ≥ 12 | 33 - 53 MGOe | 80°C (176°F) |
| 35M - 50M | 11.7 - 14.3 | ≥ 14 | 33 - 51 MGOe | 100°C (212°F) |
| 35H - 48H | 11.7 - 13.9 | ≥ 17 | 33 - 49 MGOe | 120°C (248°F) |
| 33SH - 45SH | 11.2 - 13.6 | ≥ 20 | 31 - 46 MGOe | 150°C (302°F) |
| 30UH - 40UH | 10.6 - 12.8 | ≥ 25 | 28 - 41 MGOe | 180°C (356°F) |
| 28EH - 38EH | 10.4 - 12.5 | ≥ 30 | 26 - 39 MGOe | 200°C (392°F) |
| 28AH - 35AH | 10.2 - 11.8 | ≥ 33 | 26 - 36 MGOe | 220°C (428°F) |
Choosing the correct grade is a balance between raw material costs (such as Dy/Tb content) and the magnet's thermal environment. Our engineering team assists customers in modeling magnetic flux paths to optimize costs and prevent over-specification.
Take a virtual tour of our 100,000 m² automated production line and testing facility.
Our quality assurance program is backed by advanced diagnostic instruments. We analyze raw material purity, sintered grain distribution, and magnetic properties using:
Aligning rare earth magnetic production with strict industrial standards and environmental certifications.
To operate seamlessly in global supply chains, industrial magnets must comply with local regulations. Zhejiang Laysun Magnetics operates under rigorous international frameworks to guarantee both material traceability and technical compliance.
From REACH and RoHS declarations to high-level automotive certifications like IATF 16949, our quality system is built to minimize risk. By maintaining direct control over rare earth processing and sintering, we ensure complete traceability of raw materials from the mine to the finished product.
We work closely with global shipping and logistics networks, providing specialized magnetic packaging. This ensures that air freight shipments comply with IATA packing instruction 953, preventing magnetic interference with navigation equipment.
Our commitment to permanent magnet technology through dedicated research and development.
We are optimizing grain boundary structures to reduce reliance on heavy rare earths like Dysprosium (Dy) and Terbium (Tb), helping mitigate cost fluctuations while maintaining thermal performance.
We are developing hybrid organic-inorganic coatings to provide superior chemical and physical protection, allowing magnets to operate reliably in marine environments and harsh chemical processing plants.
By using precision tooling, we minimize raw material waste and subsequent machining. This improves dimensional tolerance control and reduces manufacturing costs for custom designs.
Addressing key engineering questions regarding specifications, tolerances, and installation.
Review our specialized configurations for generators, lifting systems, and structural integration.
Laysun Magnetics