Ningbo Yunsheng Co., Ltd.

Sintered NdFeB magnets offer excellent permanent magnetic properties that surpass those of conventional permanent magnet materials and are finding increasingly wide use across industries as an indispensable functional material of modern industry. Produced by powder metallurgy sintering, they feature high remanence, high coercivity and a high energy product, and form the largest product line in the company's product center.

Grade system covers the N, M, H, SH, UH and EH series; Br 1.08-1.57 T (10.8-15.7 kGs); HcJ 960-1990 kA/m (12-25 kOe); (BH)max 223-478 kJ/m3 (28.0-60.0 MGOe); material solutions fall into four categories: HRE-free, conventional process (HRE-containing), Dy and Tb diffusion and Ce-containing; a variety of coating surface treatments is available.

• EV traction motors
• Industrial motors
• Wind power generation
• Consumer electronics
• Medical MRI equipment
• Robotics
• Home appliances
• Electric aircraft
• Electric ships

The HRE-free series within the sintered NdFeB grade portfolio achieves relatively high coercivity through grain refinement and grain boundary engineering without adding heavy rare earths such as Dy or Tb, reducing dependence on heavy rare earth resources and lowering cost.

HRE-free category of the sintered NdFeB grade portfolio; covers the N, M, H and SH series; Br 1.08-1.55 T; (BH)max 223-462 kJ/m3 (28.0-58.0 MGOe); HcJ 960-1592 kA/m.

• EV traction motors
• Industrial motors
• Home appliances
• Consumer electronics

The conventional process series within the sintered NdFeB grade portfolio improves intrinsic coercivity and temperature stability by adding heavy rare earths (HRE, such as Dy and Tb) to the alloy, and is the company's classic, fully matured volume-production grade system.

Conventional process (HRE-containing) category of the sintered NdFeB grade portfolio; covers the full N, M, H, SH, UH and EH series; Br 1.04-1.55 T; HcJ 960-1990 kA/m (up to about 25 kOe); (BH)max 207-462 kJ/m3.

• EV traction motors
• Electric aircraft traction motors
• Main propulsion motors for electric ships
• Wind turbine generators
• Servo motors

The Dy and Tb grain boundary diffusion (GBD) series within the sintered NdFeB grade portfolio enriches Dy and Tb at the surface layer of the magnet through a grain boundary diffusion process, achieving high coercivity and high temperature stability with a smaller amount of heavy rare earths and balancing performance against cost.

Dy and Tb diffusion category of the sintered NdFeB grade portfolio; focuses on high-coercivity grades such as SH, UH and EH; HcJ 1592-1990 kA/m; Br 1.08-1.55 T; (BH)max 223-462 kJ/m3.

• EV traction motors
• Electric aircraft traction motors
• High-speed precision motors
• Industrial automation servo motors

The Ce-containing series within the sintered NdFeB grade portfolio partially substitutes neodymium with cerium (Ce) to reduce material cost, and suits cost-sensitive volume applications with relatively relaxed magnetic performance requirements.

Ce-containing category of the sintered NdFeB grade portfolio; mainly medium- and low-coercivity series such as N and M; Br around 1.08-1.33 T; HcJ 960-1353 kA/m; (BH)max 223-366 kJ/m3.

• Home appliance motors
• Consumer electronics
• Industrial motors
• Miniature special motors

Permanent magnets made by mixing NdFeB powder with resin or binder and forming them by compression or injection molding; they are easily processed into complex shapes. By forming method they fall into two process directions, compression molding and injection molding, and also include injection-molded anisotropic ferrite products.

Compression-molded BNP series: Br 400-830 mT, HcB 240-520 kA/m, HcJ 480-1280 kA/m, (BH)max 24-104 kJ/m3; injection-molded BNI/BNI-SR series: PA12 or PPS matrix, Br 350-650 mT, (BH)max 20-60 kJ/m3; anisotropic AFI/ANI series: PA6+ferrite or PA12+NdFeB matrix, Br 225-850 mT, (BH)max 11.2-116 kJ/m3.

• Micro motors and miniature special motors
• Consumer electronics
• Automotive motors
• Home appliances
• Sensors
• Office automation equipment

The grade series produced by compression (die) molding within the bonded NdFeB portfolio; with a high filling degree, its magnetic performance exceeds that of injection-molded grades, making it the series with the largest capacity and usage among bonded NdFeB products.

14 grades from BNP-3 to BNP-13L; Br 400-830 mT (4.0-8.3 kGs); HcB 240-520 kA/m; HcJ 480-1280 kA/m; (BH)max 24-104 kJ/m3 (3.0-13.0 MGOe).

• Micro DC motors
• Automotive micro motors
• Home appliance motors
• Office automation equipment

The grade series produced by injection molding within the bonded NdFeB portfolio; matrix resins include polyamide 12 (PA12) and polyphenylene sulfide (PPS), allowing complex shapes and integrated one-piece structures to be molded directly and reducing post-machining.

BNI-2.5 to BNI-7 (PA12 matrix): Br 350-650 mT, (BH)max 20-60 kJ/m3; BNI-5SR, BNI-6 and BNI-6SR (PPS matrix): Br 450-600 mT, HcJ 720-1040 kA/m, (BH)max 36-52 kJ/m3.

• Micro motors
• Consumer electronics
• Automotive micro motors
• Sensors

The injection-molded anisotropic series within the bonded magnet portfolio, using PA6+ferrite (AFI) and PA12+NdFeB (ANI) matrices respectively, delivers anisotropic oriented magnetic performance while retaining molding flexibility.

AFI series (PA6+ferrite): Br 225-315 mT, HcJ 215-270 kA/m, (BH)max 11.2-17.6 kJ/m3; ANI-12 and ANI-15 (PA12+NdFeB): Br 700-850 mT, HcJ 915-1200 kA/m, (BH)max 92-116 kJ/m3.

• Micro motors
• Consumer electronics
• Automotive micro motors
• Instruments and meters

Functional magnetic system units built around a sintered or bonded NdFeB magnet core and assembled with other parts such as flux conductors, structural components and coils; the magnets are embedded, inserted or surface-mounted onto an iron core or steel plate for fixed assembly, with varying degrees of integration of shafts, bearings, outer bushings, fans, gears, balancing plates and encoders.

Sintered or bonded NdFeB can be selected for the core magnet; Halbach array or alternating N/S arrangement; bond strength greater than 4 MPa (3C assemblies) and greater than 8 MPa (rotor and linear motor assemblies); coaxiality not more than 0.1 mm; position tolerance not more than 0.15-0.2 mm; flatness not more than 0.15 mm/300 mm; weight 0.2-10 g (3C assemblies).

• EV traction motors
• Industrial motors
• Linear motors
• Consumer electronics
• Robotics
• Automation equipment

One of the magnetic assembly product series; a functional magnetic system unit formed by joining several magnet arcs, with insulation applied between the magnetic steel segments to effectively suppress electromagnetically induced eddy currents.

Insulation between magnetic steel segments; low electromagnetic eddy currents; low heat generation; high torque.

• EV traction motors
• Industrial motors
• Servo motors

One of the magnetic assembly product series; a functional magnetic system unit formed by joining several magnetic steel segments into a ring, with insulation between segments to reduce eddy current losses and support for radial magnetization.

Insulation between magnetic steel segments; low electromagnetic eddy currents; radial magnetization.

• Traction motors
• Industrial motors
• Miniature special motors

Magnetic steel assembly products for the 3C (computers, communications and consumer electronics) field, using Halbach arrays or alternating N/S arrangements, characterized by being light, small and highly precise.

Halbach array or alternating N/S arrangement; bond strength greater than 4 MPa; weight 0.2-10 g.

• Consumer electronics
• Computers
• Communication equipment

Magnetic steel assembly products for motor rotors, using Halbach arrays or alternating N/S arrangements, meeting rotor assembly and high-efficiency operation requirements through high bond strength and high positional accuracy.

Halbach array or alternating N/S arrangement; bond strength greater than 8 MPa; coaxiality not more than 0.1 mm; position tolerance not more than 0.15 mm.

• EV traction motors
• Servo motors
• Consumer electronics
• Industrial motors

Magnetic steel assembly products for linear motors, meeting the long-stroke, high-precision drive requirements of linear motors through high bond strength and high flatness and positional accuracy.

Bond strength greater than 8 MPa; flatness not more than 0.15 mm/300 mm; position tolerance not more than 0.2 mm.

• Linear motors
• Semiconductor manufacturing equipment
• High-precision machine tools
• Automation equipment