Neodymium segment magnets, also known as arc or tile magnets, are made from a sintered neodymium-iron-boron alloy and typically shaped into curved segments. These magnets are specially designed to form complete magnetic rings when assembled, making them ideal for rotating machinery. Segment magnets are commonly used in motors, generators, wind turbines, and magnetic couplings where a uniform radial magnetic field is required.
NdFeB segment magnets offer strong magnetic performance combined with a geometry that matches curved surfaces. Their arc shape allows for even magnetic flux distribution in rotating systems. They are highly resistant to demagnetization and can be customized for different operating temperatures and magnetic orientations.
Why choose Sintered Neodymium Segment Magnet
Optimized for rotation: The arc design fits perfectly into motor and generator rotors to provide smooth and efficient rotation.
Uniform magnetic field: When assembled into a ring, segment magnets deliver a consistent radial magnetic field.
Flexible customization: Available in various arc lengths, radii, thicknesses, and magnetization directions to suit different applications.
High magnetic strength: Made from high-grade NdFeB materials such as N35 to N52 for maximum energy output.
Corrosion protection: Coated with nickel, zinc, or epoxy to ensure durability in challenging environments.
NdFeB segment magnets are widely used in high-performance electric motors, wind turbine generators, magnetic pumps, and synchronous motors. Their precise arc geometry and strong magnetic properties help improve energy efficiency, reduce mechanical wear, and enable compact designs in modern electromechanical systems. They are essential components in automotive powertrains, renewable energy systems, and industrial automation.
| Material grade | Remanence Br (T/kG) | Coercivity Hcb (kOe/kA/m) | Intrinsic Coercivity Hcj (kOe/kA/m) | Maximum Energy Product (MGOe/kJ/m3) | Dy | Tb | Remarks |
| KN35 | ≥1.18(11.8) | ≥10.8(860) | ≥12(955) | 33～36(263～287) | √ | × | Scrap Inclusion |
| KN38 | ≥1.23(12.3) | ≥10.8(860) | ≥12(955) | 36～39(287～310) | √ | × | Scrap Inclusion |
| KN40 | ≥1.26(12.6) | ≥11.0(876) | ≥12(955) | 38～41(302～326) | √ | × | Scrap Inclusion |
| KN42 | ≥1.29(12.9) | ≥11.0(876) | ≥12(955) | 40～43(318～342) | √ | × | Scrap Inclusion |
| KN45 | ≥1.33(13.3) | ≥11.0(876) | ≥12(955) | 43～46(342～366) | × | × | |
| KN48 | ≥1.37(13.7) | ≥10.8(860) | ≥12(955) | 46～49(366～390) | × | × | |
| KN50 | ≥1.39(13.9) | ≥10.5(836) | ≥12(955) | 47～51(374～406) | × | × | |
| KN52 | ≥1.42(14.2) | ≥10.0(796) | ≥11(876) | 49～53(390～422) | × | × | |
| KN55 | ≥1.46(14.6) | ≥9.0(716) | ≥11(876) | 52～56(414～446) | × | × | |
| KN35M | ≥1.18(11.8) | ≥10.8(860) | ≥14(1114) | 33～36(263～287) | √ | × | Scrap Inclusion |
| KN38M | ≥1.23(12.3) | ≥11.0(876) | ≥14(1114) | 36～39(287～310) | √ | × | Scrap Inclusion |
| KN40M | ≥1.26(12.6) | ≥11.4(910) | ≥14(1114) | 38～41(302～326) | √ | × | Scrap Inclusion |
| KN42M | ≥1.29(12.9) | ≥11.8(939) | ≥14(1114) | 40～43(318～342) | √ | × | Scrap Inclusion |
| KN45M | ≥1.33(13.3) | ≥11.8(939) | ≥14(1114) | 43～46(342～366) | √ | × | Scrap Inclusion |
| KN48M | ≥1.37(13.7) | ≥11.8(939) | ≥14(1114) | 46～49(366～390) | × | × | |
| KN50M | ≥1.39(13.9) | ≥11.5(915) | ≥14(1114) | 47～51(374～406) | × | × | |
| KN52M | ≥1.42(14.2) | ≥10.8(860) | ≥13(1035) | 49～53(390～422) | × | × | |
| KN54M | ≥1.46(14.6) | ≥10.8(860) | ≥13(1035) | 52～56(414～446) | × | × | |
| KN35H | ≥1.18(11.8) | ≥10.8(860) | ≥17(1353) | 33～36(263～287) | √ | × | |
| KN38H | ≥1.23(12.3) | ≥11.0(876) | ≥17(1353) | 36～39(287～310) | √ | × | |
| KN40H | ≥1.26(12.6) | ≥11.4(910) | ≥17(1353) | 38～41(302～326) | √ | × | |
| KN42H | ≥1.29(12.9) | ≥11.8(939) | ≥17(1353) | 40～43(318～342) | √ | × | |
| KN45H | ≥1.33(13.3) | ≥11.8(939) | ≥17(1353) | 43～46(342～366) | √ | × | |
| KN48H | ≥1.37(13.7) | ≥11.8(939) | ≥17(1353) | 46～49(366～390) | √ | × | |
| KN50H | ≥1.39(13.9) | ≥11.5(915) | ≥16(1274) | 47～51(374～406) | √ | × | |
| KN52H | ≥1.42(14.2) | ≥10.8(860) | ≥16(1274) | 49～53(390～422) | √ | × | |
| KN54H | ≥1.46(14.6) | ≥10.8(860) | ≥16(1274) | 52～56(414～446) | √ | √ | |
| KN30SH | ≥1.08(10.8) | ≥10.0(796) | ≥20(1592) | 28～31(223～247) | × | × | |
| KN33SH | ≥1.14(11.4) | ≥10.5(836) | ≥20(1592) | 31～34(247～271) | × | × | |
| KN35SH | ≥1.18(11.8) | ≥10.8(860) | ≥20(1592) | 33～36(263～287) | √ | × | |
| KN38SH | ≥1.23(12.3) | ≥11.0(876) | ≥20(1592) | 36～39(287～310) | √ | × | |
| KN40SH | ≥1.26(12.6) | ≥11.4(910) | ≥20(1592) | 38～41(302～326) | √ | × | |
| KN42SH | ≥1.29(12.9) | ≥11.8(939) | ≥20(1592) | 40～43(318～342) | √ | × | |
| KN45SH | ≥1.33(13.3) | ≥11.8(939) | ≥20(1592) | 43～46(342～366) | √ | × | |
| KN48SH | ≥1.37(13.7) | ≥11.8(939) | ≥19(1512) | 46～49(366～390) | √ | × | |
| KN50SH | ≥1.39(13.9) | ≥11.5(915) | ≥19(1512) | 47～51(374～406) | × | √ | |
| KN52SH | ≥1.42(14.2) | ≥10.8(860) | ≥19(1512) | 49～53(390～422) | × | √ | |
| KN54SH | ≥1.46(14.6) | ≥10.8(860) | ≥19(1512) | 52～56(414～446) | × | √ | |
| KN30UH | ≥1.08(10.8) | ≥10.0(796) | ≥25(1990) | 28～31(223～247) | √ | × | |
| KN33UH | ≥1.14(11.4) | ≥10.5(836) | ≥25(1990) | 31～34(247～271) | √ | × | |
| KN35UH | ≥1.18(11.8) | ≥10.8(860) | ≥25(1990) | 33～36(263～287) | √ | × | |
| KN38UH | ≥1.23(12.3) | ≥11.0(876) | ≥25(1990) | 36～39(287～310) | √ | × | |
| KN40UH | ≥1.26(12.6) | ≥11.4(910) | ≥25(1990) | 38～41(302～326) | √ | × | |
| KN42UH | ≥1.29(12.9) | ≥11.8(939) | ≥25(1990) | 40～43(318～342) | √ | × | |
| KN45UH | ≥1.33(13.3) | ≥11.8(939) | ≥24(1910) | 43～46(342～366) | √ | √ | |
| KN48UH | ≥1.37(13.7) | ≥11.8(939) | ≥24(1910) | 46～49(366～390) | √ | √ | |
| KN50UH | ≥1.39(13.9) | ≥11.5(915) | ≥24(1910) | 47～51(374～406) | √ | √ | |
| KN52UH | ≥1.42(14.2) | ≥10.8(860) | ≥24(1910) | 49～53(390～422) | √ | √ | |
| KN30EH | ≥1.08(10.8) | ≥10.0(796) | ≥30(2388) | 28～31(223～247) | √ | √ | |
| KN33EH | ≥1.13(11.3) | ≥10.5(836) | ≥30(2388) | 31～34(247～271) | √ | √ | |
| KN35EH | ≥1.17(11.7) | ≥10.8(860) | ≥30(2388) | 33～36(263～287) | √ | √ | |
| KN38EH | ≥1.22(12.2) | ≥11.0(876) | ≥30(2388) | 36～39(287～310) | √ | √ | |
| KN40EH | ≥1.25(12.5) | ≥11.0(876) | ≥29(2308) | 38～41(302～326) | √ | √ | |
| KN42EH | ≥1.28(12.8) | ≥10.0(796) | ≥29(2308) | 40～43(318～342) | √ | √ | |
| KN45EH | ≥1.33(13.3) | ≥11.8(939) | ≥29(2308) | 43～46(342～366) | √ | √ | |
| KN48EH | ≥1.37(13.7) | ≥11.8(939) | ≥29(2308) | 46～49(366～390) | √ | √ | |
| KN30TH | ≥1.08(10.8) | ≥10.0(796) | ≥35(2786) | 28～31(223～247) | √ | √ | |
| KN33TH | ≥1.13(11.3) | ≥10.5(836) | ≥35(2786) | 31～34(247～271) | √ | √ | |
| KN35TH | ≥1.17(11.7) | ≥10.8(860) | ≥35(2786) | 33～36(263～287) | √ | √ | |
| KN38TH | ≥1.22(12.2) | ≥11.0(876) | ≥34(2706) | 35～39(279～310) | √ | √ | |
| KN40TH | ≥1.25(12.5) | ≥10.5(836) | ≥34(2706) | 38～41(302～326) | √ | √ | |
| KN42TH | ≥1.28(12.8) | ≥10.0(796) | ≥34(2706) | 40～43(318～342) | √ | √ |
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Sintered NdFeB Permanent Magnetic Materials
Zhejiang Kaiven Magnet Co., Ltd is leading Neodymium Ring Magnet manufacturers and suppliers in China, The company's current production process of sintered NdFeB permanent magnet materials can be divided into two parts: the blank process (also known as the "front process" in the industry) and the finished product process (also known as the "post process" in the industry): the blank process is the praseodymium Neodymium metal, pure iron, ferroboron and other raw materials are used to make NdFeB blanks; the finished product process is to process NdFeB blanks by mechanical processing and surface treatment to obtain NdFeB magnets. We also OEM/ODM custom sintered NdFeB ring magnet. The specific production process flow chart is as follows:
Kaiven is committed to becoming a world-renowned supplier of permanent magnet material application solutions in the field of new generation consumer electronics and energy-saving home appliances. Welcome to visit our NdFeB ring magnet factory in China.
The company applies technologies such as casting columnar crystal growth control technology, grain refinement and micro-optimization technology, etc., and is committed to improving the consistency of powder and giving full play to the performance potential of rare earth. By improving the smelting microstructure, applying fine-grain technology, and optimizing the mixing process, etc., significantly improving the performance of NdFeB magnets.
The company has applied and improved low-oxygen magnet preparation technology and cold isostatic pressing technology, so that NdFeB magnets are in a low-oxygen state during the pressing process, and the preparation of molding blanks is continuously optimized, which effectively reduces the loss of rare earth. The application of low-temperature sintering heat treatment technology has further improved the sintering process. Adjusting the temperature to a suitable state can give full play to the performance of the formula. The representative products are high-performance N55 magnets prepared by low-oxygen technology and N38UH magnets produced by near-net molding technology.
In order to pursue the accurate precision of customer customization, the company applies high-performance ultra-thin small special-shaped permanent magnet preparation technology to carry out high-efficiency and low-loss precision machining of NdFeB blanks, breaking through the technical bottleneck of high-performance thin and small magnet processing difficulty, and Strictly control product appearance defects through intelligent image appearance automatic inspection technology to improve inspection efficiency and accuracy.
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Established in 1987. With advanced technology and strong R&D capabilities, Kaiven Magnet has grown into a leading ferrite magnets and neodymium magnets manufacturer and exporter in China.
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