Ferrite Magnets FB Series Product Guide Introduction Magnetic characteristics transition of TDK ferrite magnet Features of TDK ferrite magnets Magnetic characteristics distribution charts of FB Series Transition of material group development Typical material characteristics Example of magnetic characteristics Example of physical / mechanical characteristics Example of Intrinsic coercive force H C J vs. temperature characteristics Basic Physical Properties of Ferrite Magnets Physical and mechanical characteristics Temperature characteristics Demagnetization by the external magnetic field Magnetization characteristics Precautions regarding safety and use Contents Update : MAY 2014 The details can be found by referring to the appended individual delivery specifications. All specifications are subject to change without notice. magnet_fb_summary_en/20140520 1/ 13 Ferrite Magnet FB Series Introduction From the birth of the FB1A material in 1959 to the latest materials, the development history of TDK ferrite magnets has been in synchronization with the advancement of magnetic application technologies. Quickly and accurately responding to market demands with active involvement of new markets together with our customers -- that's our basic stance throughout the 50 years of TDK ferrite magnet development history. One of our latest achievements is the high-power La-Co-free material shown as an orange line at the bottom right. Eliminating rarer elements such as La (lanthanum) and Co (cobalt), we realized the world's highest-level performance close to that of the La-Co-added FB9 material. We also established the world's first thin-shaped molding system which allows 1.5mm-thick skew forms. We used this innovative original process for the FB12 material, one of the optimum materials in the FB series magnetic characteristics distribution map. The purple line at the bottom right shows the result. This new material provides freedom in designing shapes for motor's optimum magnetic efficiency as well as the property superiority which exceeds the FB12 material. TDK also established the "in-market-service" system in which we responds to customers' orders and requests for technical services through our production bases and service offices inside/outside Japan. We are committed to supporting your rapid and optimized magnet application design and development as a "concept-in" company, providing our extensive expertise concerning magnetic circuit design as well as quality and high-performance magnets. Magnetic characteristics transition of TDK ferrite magnet (MG Oe) (kJ/m3) 100 800 70 600 NEOREC55 NEOREC50 50 400 Neodymium NEOREC53 Sm2Co17 30 max ) 200 BH ( Al-Ni-Co-Fe 100 Nd-Fe-B-Plastic 10 80 Al-Ni-Co-Fe Thin-shaped 60 molding 7 SmCo5 FB12 FB13B/FB14H La-Co-added FB9 Al-Ni-Co-Fe Sr-ferrite La-Co-Free 5 Ba-ferrite FB5 FB6 40 Wet anisotropy La-Co-added FB5D FB9 F Wet anisotropy FB4D FB3N 3 Sr-ferrite Dry anisotropy 20 Ba-ferrite Maximum energy product product energy Maximum NKS Steel Dry anisotropy MK Steel Ba-ferrite Isotropy 10 KS Steel Co-ferrite 1 8 0.7 6 0.5 4 19201930 1940 1950 1960 1970 1980 1990 2000 2010 2020 Year The details can be found by referring to the appended individual delivery specifications. magnet_fb_summary_en/20140520 All specifications are subject to change without notice. 2 / 13 Ferrite Magnet FB Series Features of TDK ferrite magnets A oxide magnet made by sintering, using advanced fine powder control technologies based on a powder metallurgy method. Not susceptible to weakened magnetic fields, this is our core magnet product with out-standing properties for practical applications that surpass those of conventional metal magnets. Another strong feature is that it can be produced in volume at costs significantly below neodymium magnets. FB13B, FB14H : High-performance / thin-shaped molding materials (Available thickness : 1.0 to 2.0mm) FB9NF, FB9BF, FB9HF : High-power / State-of-the-art La-Co-free materials Magnetic characteristics distribution charts of FB Series 5.0 500 (kG) (mT) Material FB13B 4.8 480 group FB14H FB9N FB12B FB12 4.6 460 High-power FB9B FB12H thin-shaped molding materials FB9NF FB9BF 4.4 440 FB9 FB9H FB6N FB6B 4.2 420 High-power La-Co-free materials FB5D FB9HF FB6H FB6 4.0 400 FB5DH FB3N FB6E 3.8 380 Residual magnetic flux density Br flux Residual magnetic La-Co-added materials FB3G La-Co-free materials 3.6 360 Thin-shaped molding process 3.4 340 200 250 300 350 400 450 500 Wet molding process (kA/m) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 (kOe) Dry molding process Intrinsic coercive force HCJ ( kA/m) Development trends in material group of the FB Series 4.8 480 FB13B 380 (kG) (mT) FB12B 380 FB14H 430 r H 4.6 460 FB9N 286 FB12H 430 h B CJ HHighig Br 430 High Hcj FB9B 358 FB9NF 280 400 397 4.4 440 FB6N 263 FB9BF 340 394 FB9H 397 380 4.2 420 FB6B 318 358 FB5D 263 340 High-performance ferrite magnet Dry 318 FB9HF 400 for outer rotor 4.0 400 FB6H 358 FB5DH 318 286 FB3N 239 280 Dry 271 Residual magnetic flux density Br flux Residual magnetic 3.8 380 FB6E 394 263 FB3G 271 239 Year 1985 1990 1995 2000 2005 2010 2015 The details can be found by referring to the appended individual delivery specifications. magnet_fb_summary_en/20140520 All specifications are subject to change without notice. 3 / 13 Ferrite Magnet FB Series Typical material characteristics Example of Magnetic characteristics Residual Coercive Intrinsic Maximum Type Material Molding Material magnetic flux density force coercive force energy product group process name 3 Br ( mT) HCB ( kA/ m) HCJ ( kA/ m) ( BH )max ( kJ/ m ) High-power FB13B 475 ±10 340 ± 20 380 ± 20 44.0 ±1.6 FB12 Thin- La-Co-added shaped FB14H 470 ±10 355 ± 20 430 ± 20 43.1 ±1.6 High-power FB12B 470 ±10 340 ±12 380 ±12 43.1 ±1.6 FB12 Wet La-Co-added FB12H 460 ±10 345 ±15 430 ±15 41.4 ±1.6 FB9N 460 ±10 278.5 ±12 286.5 ±12 40.4 ±1.6 Higher power FB9 Wet FB9B 450 ±10 342.2 ±12 358.1 ±12 38.6 ±1.6 La-Co-added FB9H 430 ±10 330.2 ±12 397.9 ±12 35.0 ±1.6 FB9NF 450 ±10 270 ±12 280 ±12 38.4 ±1.6 Higher power Wet FB9BF 435 ±10 315 ±12 340 ±12 36.3 ±1.6 La - Co-free FB9HF 405 ±10 310 ±12 400 ±12 31.7 ±1.6 FB6N 440 ±10 258.6 ±12 262.6 ±12 36.7 ±1.6 FB6B 420 ±10 302.4 ±12 318.3 ±12 33.4 ±1.6 La - Co-free FB6 Wet FB6H 400 ±10 302.4 ±12 358.1±12 30.3 ±1.6 FB6E 380 ±10 290.5 ±12 393.9 ±12 27.5 ±1.6 FB5D 415 ±10 254.6 ±12 262.6 ± 20 32.6 ±1.6 La-Co-added FB9 Dry FB5DH 400 ±10 278.6 ±11.9 318.3 ±15.9 30.3 ±1.6 FB3N 395 ±15 234.8 ±12 238.7 ±16 28.7 ± 2.4 La - Co-free FB6 Dry FB3G 375 ±15 254.6 ±16 270.6 ± 20 25.9 ± 2.4 Curie Recoil Magnetizing 500 temperature permeability magnetic field La-Co-added Thin-shaped molding process Tc ( K ) rec ( kA/m ) La-Co-free ) FB13B 480 733 1.05 to 1.10 >1000 FB14H mT ( FB9N FB12B 460 Examples of H CJ vs. temperature characteristics FB12H of representative materials FB9B FB9NF FB9BF 450 440 FB9H FB6N ) Wet FB6B 400 molding 420 process kA/m FB5D ( FB9HF 350 FB6H CJ Dry H 400 molding FB5DH FB3N process 300 FB6E force force Intrinsic coercive 380 250 density Br flux Residual magnetic FB3G -50 0 50 100 150 Temperature ( °C ) 360 Temperature coefficient 200 250 300 350 400 450 ( ) La, Co type La, Co Free Intrinsic coercive force HCJ kA/m FB12B FB9B FB9BF FB6B 0.11%/K 0.18%/K 0.29%/K 0.30%/K Physical and mechanical characteristics Specific Thermal expansion coefficient Flexural Compressive Tensile Young's Density heat strength strength strength modulus Vickers ( Mg/m3 ) ( ppm/K ) hardness Hv ( J/kg•K ) ( MPa ) ( MPa ) ( MPa ) ( GPa ) C//*1 C *2 4.9 to 5.1837 15 10 70 700 35 200 530 *1. C// : Measurement value in the direction of easy magnetization *2. C : Measurement value in the direction perpendicular to the direction of easy magnetization The details can be found by referring to the appended individual delivery specifications. magnet_fb_summary_en/20140520 All specifications are subject to change without notice. 4 / 13 Ferrite Magnet FB Series Part number structure Example of a standard-shaped product -1 Details on shape and size are specified in the Segment type individual delivery specification. Material code We handle requests for parts in both standard Shape code : C and various special shapes. Please contact for Size code (mm) : outer x Inner x L details on shape samples, largest and/or smallest Internal code* * Includes magnetization direction code size, etc. Example of a standard-shaped product Material code Example of a standard-shaped product -2 Cylinder type, Circular disc type, S : Special shape code Cylinder type with hole, Ring type, Shape code : C Cubic/cuboid type, Plate-shaped type, Shape and magnetization Cubic/cuboid type with hole, direction code : D, DH, RH, W, WH Plate-shaped type with hole Size code (mm) : Point and descrip- tion order are specified per shape Material code Internal code Shape and magnetization direction code : D, DH, RH, W, WH Size code (mm) : Point and description order are specified per shape Internal code Example -1 Shape Shape code Size description point Size code Magnetization direction (specified by internal code) Segment type C e x f x b Parallel Radial øe øf b Example -2 Shape and magnetization Size Shape / Magnetization direction Size code direction code description point Cylinder type b Axial direction a x b Circular disc type D ø a Cylinder type with hole Axial direction ø b Ring type DH c a x b x c Cylinder type with hole Orthogonal to RH ø a Ring type axial direction c Cubic/cuboid type Thickness direction W a x b x c Plate-shaped type a b a ≥ b c Cubic/cuboid type with hole Thickness direction WH a x b x c Plate-shaped type with hole a b a ≥ b * Cubic/cuboid, plate-shaped type with hole is available only in dry molding material The details can be found by referring to the appended individual delivery specifications.