ferrite magnets - fumaw.com.t · (1/33) 001-03 / 20081104 / e321.fm • all specifications are...

Introduction.................................................................................. 1Anisotropic Materials (High Performance)

FB12 Series (Wet-molded) ...................................................... 2FB9 Series (Wet-molded) ........................................................ 2FB5D Series (Dry-molded) ...................................................... 2

Dry-Molded Anisotropic Materials ............................................... 3Anisotropic Multi-Polar Ring Magnets

CRI (Anisotropic Multi-Polar) Type........................................... 4SRH (Anisotropic Two-Polar) Type........................................... 4

Br/HCJ Characteristic Distribution, FB Series .............................. 5Recommended Materials and Typical Applications

Wet-Anisotoropic Materials...................................................... 6Dry-Anisotoropic Materials ...................................................... 7Anisotropic Multi-Polar Materials for Ring Type ....................... 8Special Material for Bipolar Anisotropic Ring Magnets............ 8Dry-Isotropic Materials............................................................. 8

Recommended Materials’ Table by Application........................... 9Magnetic, Physical and Mechanical Characteristics.................. 11Demagnetization Curves/Magnetic Characteristics

Wet-Anisotropic Materials FB12B......................................... 13FB12H ........................................ 14FB9N .......................................... 15FB9B........................................... 16FB9H .......................................... 17FB6N .......................................... 18FB6B........................................... 19FB6H .......................................... 20FB6E........................................... 21FB5N .......................................... 22FB5B........................................... 23FB5H .......................................... 24

Dry-Anisotropic Materials FB5D .......................................... 25FB5DH........................................ 26FB3N .......................................... 27FB3G .......................................... 28FB3X........................................... 29

Dry-Isotropic Materials FB1A........................................... 30Typical Shapes and Product Identifications............................... 31Dimensional Tolerances ............................................................ 32

Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

FERRITE MAGNETS

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• All specifications are subject to change without notice.

Ferrite Magnets FB Series

INTRODUCTION

From the development of the FB1A material grade in 1959, TDK’s history of developing ferrite magnets has reflected with the progress of

magnet application technology. At times, the rapid advance of demand surpassed our capabilities. The race to develop new materials

intensified during these times, when every competitor was working hard to catch up to and surpass all the others. At other times, we virtu-

ally worked around the clock to develop new characteristics to support the technological objectives of our customers. Our technology

departments faced many challenges, starting with the integration of physical properties, and including our efforts to reduce manufacturing

costs by rationalizing our production lines and optimizing our material procurement practices to improve every product’s performance to

impart a "differentiating factor" for the applied product. Our pride and our passion as the first company to make ferrite materials commer-

cially available to the industrial world have been the driving force behind our efforts. Our rapid and unerring response to changing needs,

as well as our aggressive involvement in the development of new markets, is the essence of our over 40 years of history in the field of fer-

rite magnet development.

The fruits of our technological development and the unique expertise we have gained in this process are shared among the relevant divi-

sions within the company. Powder control technology is an excellent example. Our reserch & development provide many uniquely devel-

oped concepts such as composite control technology, high dispersion technology, structural analysis and composite analysis technology,

and high-precision molding. The results of their work, including such recent achievements as microscopic crystalline structures and very-

large-scale production systems, are circulated, exchanged, and honed by the various divisions. Our "comprehensive strengths" give us

the ability to produce accurate records of performance and data if requested. The products of our "comprehensive strengths"— which

have evolved in a competitive environment fostered by these technological exchanges — include a wide range of ferrite and ceramic appli-

cations as well as rare earth and composite magnets, all of which have gained excellent reputations in a broad range of technological

fields. The innovative nature of TDK ferrite magnets is supported by our wide ranging expertise, the fruits of our latest research efforts

attained by our technological pursuits, and the accumulation of various capabilities based on a diverse range of perspectives.

We must have the capability to select the optimal material for a particular design objective for applied products, to design the optimal

shape for improving the efficiency of a magnetic circuit, and to improve existing materials or begin the development of new materials to

deliver the magnetic characteristics required by our customers. We must also have a development system that is flexible enough and is

capable of responding quickly enough to support our customers in their efforts to reduce product development times. In addition to our

development and manufacturing technologies, we must have a production management and distribution service system capable of quickly

delivering ordered materials of different shapes in the proper quantity to ensure that we continue to be a trusted supplier to our customers.

TDK currently operates six plants dedicated to ferrite magnet production in Japan and overseas. We have established an "in-market" ser-

vice system for responding quickly to orders and requests for technical services when customers contact one of our production or service

offices. In addition to delivering high-quality magnets with excellent characteristics, we also actively support our customers efforts to

reduce design time and to optimize their designs based on our abundant expertise in the filed of magnetic circuitry design.

• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

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HIGH PERFORMANCE ANISOTROPIC MATERIALS

FB12(WET-MOLDED), FB9(WET-MOLDED) AND FB5D(DRY-MOLDED) SERIES

With new compositions and microstructures, these ferrite magnets deliver the best characteristics.

FEATURESFB12 SERIES(FB12B, FB12H)This wet-molded anisotropic ferrite magnet is even better than the FB9 Series and delivers the world’s best magnetic force with an even

further improved coercive force HCJ temperature coefficient.

FB9 SERIES(FB9N, FB9B, FB9H)These wet-molded anisotropic ferrite magnets deliver energy product with a substantially improved coercive force HCJ temperature coeffi-

cient.

FB5D SERIES(FB5D, FB5DH)These dry-molded ferrite magnets deliver magnetic characteristics that rival wet-molded magnets. These magnets can be made into small

and complex shapes that are difficult to make as wet-molded magnets. Their coercive force HCJ temperature coefficient is also superior.

APPLICATIONSFB12/FB9 SERIESElectrical motors, actuators, appliance motors, medical equipment and other motors.

FB5D SERIESCD/DVD-ROM, office computing and audio-visual equipment, household appliances, power tools and other motors.

MATERIAL CHARACTERISTICS DISTRIBUTION

MAGNETIC CHARACTERISTICS

• [ ]: in the unit of SI( ): in the unit of CGS

Material FB12B FB12H FB9N FB9B FB9H FB5D FB5DH

Residual flux density Br[mT] 470±10 460±10 460±10 450±10 430±10 415±10 400±10(kG) 4.70±0.1 4.60±0.1 4.60±0.1 4.50±0.1 4.30±0.1 4.15±0.1 4.00±0.1

Coercive force HCB[kA/m] 340±12 345±15 278.5±12 342.2±12 330.2±12 254.6±12 278.6±12(kOe) 4.3±0.15 4.3±0.19 3.5±0.15 4.3±0.15 4.15±0.15 3.2±0.15 3.5±0.15

Intrinsic coercive force HCJ[kA/m] 380±12 430±15 286.5±12 358.1±12 397.9±12 262.6±16 318.3±16(kOe) 4.8±0.15 5.4±0.19 3.6±0.15 4.5±0.15 5.0±0.15 3.3±0.2 4.0±0.2

Maximum energy product (BH)max[kJ/m3] 43.1±1.6 41.4±1.6 40.4±1.6 38.6±1.6 35.0±1.6 32.6±1.6 30.3±1.6(MGOe) 5.4±0.2 5.2±0.2 5.1±0.2 4.9±0.2 4.4±0.2 4.1±0.2 3.8±0.2

200

Intrinsic coercive force HCJ

400350300250 450[kA/m]

2.5 3.0 3.5 4.0 4.5 5.0 5.5(kOe)

Res

idua

l flu

x de

nsity

Br(

mT

, ×10

G)

480

500

380

360

400

420

440

460

FB6N

FB6B

FB6H

FB9H

FB9B

FB6EFB3N

FB3G

FB5D

FB5DH

FB9N

FB12B

FB12H

High performance dry-molded type

High performance wet-molded typeHigh performance wet-molded type

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DRY-MOLDED ANISOTROPIC MATERIALS

FEATURES/TYPICAL SHAPES AND APPLICATIONS

FEATURES• The residual flux density Br and the coercive force HCJ are

excellent, which are equivalent to those of the one of wet molded

grades.

• This grade makes it possible to mold miniature size products

and/or complicated profiled products where the wet molded

grade can not be applied.

• Cost effectiveness is far superior to one of wet molded grades in

certain applications.

• This grade fits applications which require high Br value with

small size and/or complex shape, such as micro-motors, clamp-

ing applications for CD-ROM and DVD, hybrid stepping motors

and automotive distributors.a: For micro-motorsb, c: For automotive distributors

TYPICAL SHAPES AND APLLICATIONS

a

b

c

Shape Shape’s code Main applications Advantages over wet-molded magnets

C

Optical pick-up drive motors for CD-ROM, MD and DVDSpindle motors for CD-ROM, MD and DVDZooming and focusing motors for cameraVibrating motors for telephone pager

It is easy to mold small magnets that cannot be made by wet molding as well as small shapes that until now had to rely on cutting or slicing.

DHClamping applications for CD-ROM, MD and DVDHybrid stepping motors

D, WSensorsBiasing magnet for micro-wave transmitting devices

SW, SWHAutomotive distributorsSensors

These can be molded into complex shapes that are difficult to achieve in wet molding.

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ANISOTROPIC MULTI-POLAR RING MAGNETS CRI AND SRH TYPES

ANISOTROPIC MULTI-POLAR RING MAGNET, CRI TYPEThe anisotropic multi-polar ring magnet, CRI type was developed

mainly for stepping motor application. It has pole-to-pole oriented

crystal grains, and therefore has the highest surface flux density

and the largest total flux value among ring shaped ferrite magnets.

These features fit downsizing and/or performance improvement of

its applications such as stepping motors, time-rotors, various types

of sensors, etc.

APPLICATIONSStepping motors, time-rotors, various types of sensors, etc.

TYPICAL APPLICATION(Rotor assembly for stepping motor)

COMPARISON BETWEEN ANISOTROPIC MULTI-POLAR AND ISOTROPIC RING MAGNETS

∗ Relative figures compared to those of FB1A. These are based on experimental results of 24-polar ring magnets with ø24mm outer diameter, ø17mm inner diameter and 17mm in axial length. These figures will vary when the size and pole numbers are changed.

ANISOTROPIC TWO-POLAR RING MAGNET, SRH TYPESRH type was developed as the anisotropic two-polar ring magnet.

It has parallel oriented crystal grains through the direction of diam-

eter, which remarkably improves its magnetic characteristics.

APPLICATIONSWater pump motors for home appliances(e.g. washing machines

and dishwashers).

Various kinds of fluid pump motors for medical and industrial

equipment

M

MM

M

M

MM M

TypeAnisotropic multi-polar IsotropicCRI RI

Easy axis of magnetization(orientation)

Applied material FB5K FB4K FB1ASurface flux density∗ 1.6 1.5 1Total flux density∗ 1.7 1.6 1

M M

MM

M

M

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Br/HCJ CHARACTERISTIC DISTRIBUTION FB SERIES

Wet-anisotropic material: FB12B/FB12H/FB9N/FB9B/FB9H/FB6N/FB6B/FB6H/FB6E/FB5N/FB5B/FB5HDry-anisotropic material: FB5D/FB5DH/FB3N/FB3G/FB3XDry-isotropic material

480

460

440

420

400

380

360

340

320

300

280

260

240

220

200100 150 200 250 300 350 400

Intrinsic coercive force HCJ

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

450[kA/m]

5.5(kOe)

[ mT

]4.8

2.0

4.6

4.4

4.2

4.0

3.8

3.6

3.4

3.2

3.0

2.8

2.6

2.4

2.2

Res

idua

l flu

x de

nsity

Br

( kG

)

FB9N

FB5N FB6N

FB3N

FB3XFB3G

FB5D

FB5B

FB6B

FB6H

FB6E

FB9H

FB9B

FB12H

FB12B

FB1A

FB5H

FB5DH

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RECOMMENDED MATERIALS AND TYPICAL APPLICATIONS

WET-ANISOTROPIC MATERIALS: FB12B/FB12H/FB9N/FB9B/FB9H/FB6N/FB6B/FB6H/FB6E/FB5N/FB5B/FB5H

Material Application field Main application and functionApplied other material

Magnet’s shape

Feature

FB12BFB12H

Motor Automotive/fuel pump FB6N C The magnet has the world's best properties, and is ideal for high performance small motors and generators.

Automotive/window lift FB6N CAutomotive/Antilock brake sensor FB6H CAutomotive/window shield wiper FB5B CHome appliance/refrigerator compressor FB6B CHome appliance/air conditioner compressor FB6B C

FB9NFB9BFB9HFB6N

Motor Automotive/fuel pump FB5B C The magnet has High Br and High Hc, and is ideal for small and high-performance motors, and genera-tors.

Automotive/window lift FB5B CHome appliance/air conditioner compressor FB6B, FB5H CHome appliance/refrigerator compressor FB6B, FB5H C

Generator Home appliance/washing machine main drive FB6B, FB5H CFB6B Motor Motor-cycle/flywheel FB5B C These magnets offer a good bal-

ance of Br and Hc values at high levels. They are particularly suited for high-powered motors with large demag-netizing fields.

Automotive/Antilock brake sensor FB5H CAutomotive/fan FB5H CAutomotive/window shield wiper FB5H CAutomotive/power steering FB5H CAutomotive/active suspension FB5H CAutomotive/power braking FB5H CFA/robot axial and joint movement FB5H CFA/robot main drive FB5H CFA/table drive FB5H C, WHome appliance/air conditioner compressor FB6N, FB5H CHome appliance/refrigerator compressor FB6N, FB5H C

FB6HFB6E

MotorHome appliance/washing machine main drive FB6N, FB5H C

These magnets deliver the highest Hc value of all ferrite magnets. They are best suited for starter motors with large demagnetizing fields.Automotive/starter — C

FB5N Motor Motor-cycle/starter — C These high Br magnets offer excel-lent cost performance.AV/VCR capstan FB3N DH

AV/VCR head rotation FB3N DHAV equipment — DH

Others Home appliance/microwave oven magnetron — DHFB5B Motor Automotive/fuel pump FB6N DH These magnets deliver high Br and

a relatively high level of Hc. They offer excellent cost perfor-mance and are suited for a diverse range of small, high-performance motors.

Automotive/window lift FB6N CHome appliance/power tool FB3G, FB3N CHome appliance/fan FB3G, FB3N C

Generator Motor-cycle/flywheel FB6N CSensor Automotive/Antilock brake sensor FB3G CHolding FA/tool holding device FB5H W

Automotive/Antilock brake sensor FB6B W, RFB5H Motor Automotive/fan FB6B C These magnets offer a good bal-

ance of Br and Hc values at high levels and also offer excellent cost performance. They are particularly suited for high-powered motors with large demag-netizing fields.

Automotive/window shield wiper FB6B CAutomotive/power steering FB6B CAutomotive/active suspension FB6B CAutomotive/power braking — CFA/robot axial and joint movement FB6B —FA/robot main drive FB6B CFA/table drive FB6B W, CFA/belt drive FB6B W, CHome appliance/washing machine main drive FB6B C

Holding FA/tool holding device FB5B WOthers Medical equipment/MRI — WCoupling Medical equipment/blood circulation pump unit — DH

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DRY-ANISOTROPIC MATERIALS: FB5D/FB3N

Material Application field Main application and functionApplied other materials

Magnet’s shape

Features

FB5D Motor OA/CD-ROM, DVD spindle FB3N C, DH These dry molded magnets deliver high Br and high Hc values. They are suited for a diverse range of applications that require small and complex shapes, especially for micro motor.

OA/CD-ROM, DVD optical pick-up drive FB3N COA/FDD spindle — DH, CAV/camera, video camera zoom FB3N CAV/camera, video camera focus FB3N CAV/camera, film winding FB3N CAV/CD, LD, MD optical pick-up drive FB3N CAV/MD spindle FB3N C, DHAV/VCR capstan FB3N C, DHAV/VCR head rotation FB3N D, DH

Clamping OA/CD-ROM/DVD FB3N DHAV/CD, MD FB3N DH

Sensor Automotive/distributor — WFB3N Motor Automotive/door lock FB3G C These dry molded magnets deliver

high Br and high Hc values. They are suited for a diverse range of applications that require small and complex shapes.

Automotive/mirror movement FB3G COA/FDD spindle — DH, COA/CD-ROM, DVD spindle — COA/CD-ROM, DVD optical pick-up drive — COA/CD-ROM, FDD, DVD loading FB3G COA/cooling fan — CAV/VCR reeling — CAV/VCR loading — CAV/VCR capstan — C, DHAV/VCR head rotation — C, DHAV/camera, video camera zoom — CAV/camera, video camera focus — CAV/camera, film winding — CAV/radio-audio cassette capstan — CAV/radio-audio cassette reeling — CAV/CD, LD spindle — C, DHAV/MD spindle — C, DHAV/CD, LD, MD loading — CAV/CD, LD, MD optical pick-up drive FB3G CHome appliance/air conditioner fan FB3G CHome appliance/refrigerator fan FB3G CHome appliance/microwave oven fan FB3G CHome appliance/microwave oven plate rotation FB3G CHome appliance/air-filtering fan FB3G CHome appliance/mixer, juicer FB3G CHome appliance/hair dryer FB3G CHome appliance/shaver FB3G CHome appliance/electric tooth brushing FB3G CHome appliance/electric tool FB3G, FB5B CHome appliance/pump FB3G CMedical equipment/pump FB3G CToy FB3G C

Clamping OA/CD-ROM, DVD — DHAV/CD, MD — DH

Sensor For automobile airbag sensors FB5B WHeadphone AV/portable — DH

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DRY-ANISOTROPIC MATERIALS: FB3G

OTHER MATERIALSANISOTROPIC MULTI-POLAR MATERIALS FOR RING TYPE: FB5K

SPECIAL MATERIAL FOR BIPOLAR ANISOTROPIC RING MAGNETS: FB5R

DRY-ISOTROPIC MATERIALS: FB1A


Magnet’s shape

Features

FB3G Motor Automotive/door lock FB3N C These dry molded magnets deliver high Hc values. They deliver excellent characteris-tics in applications where low-tem-perature demagnetization is small and the demagnetizing field is large.

Automotive/mirror movement FB3N COA/cooling fan FB3N CHome appliance/air conditioner fan FB3N CHome appliance/refrigerator fan FB3N CHome appliance/microwave oven fan FB3N CHome appliance/microwave oven plate rotation FB3N CHome appliance/air-filtering fan FB3N CHome appliance/mixer, juicer FB3N CHome appliance/hair dryer FB3N CHome appliance/shaver FB3N CHome appliance/electric tooth brushing FB3N CHome appliance/electric tool FB3N, FB5B CHome appliance/pump FB3N CMedical equipment/pump FB3N CToy FB3N C

Sensor Automotive/Antilock brake sensor FB5B WAutomotive/fuel, oil level sensing — W, DHome appliance/washing machine door sensing — W, D

Holding Holding devices — WMedical Magnetic health care goods FB1A D


Magnet’s shape

Features

FB5K Stepping motor Home appliance/Air conditioner louvers — CRI These magnets are exclusively for polar-anisotropic ring magnets (CRI). They deliver top level charac-teristics, are suited for making mag-nets of reduced sizes and thickness and for improving the performance of stepping motors and timer motors.

OA/FDD head actuator — CRIOA/printer paper feeding — CRIOA/printer head actuator — CRIOA/copy machine drum rotation — CRIOA/copy machine paper feeding — CRI

OA/facsimile machine paper feeding — CRI


Magnet’s shape

Features

FB5R Motor Home appliance/drainage pumps in washing machines

— SRHThis material was specially designed for bipolar anisotropic ring magnets. It offers top levels of per-formance and is suited for improv-ing pump and fan motor performance.

Home appliance/washing machine circulation — SRH

Home appliance/heater ventilation — SRH

Other/water tank pumps — SRH


Magnet’s shape

Features

FB1A Sensor Automotive/For automobile airbags — RI These isotropic magnets are dimen-sionally accurate and deliver stable characteristics. They are easy to polarize, offer excellent cost performance and are best suited in applications that do not require strong magnetic fields.

Automotive/For automobile speedometers — DH

Magnetic correctionAV/Slant correction in audio-visual equipment and TVs

— W

Oscillation Various buzzers — RICoupling FA/For machining tools — RIMagnetic health care goods

Medical equipment/ magnetic health care goods FB3G D

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RECOMMENDED MATERIALS’ TABLE BY APPLICATION

AUTOMOTIVE, MOTOR-CYCLE

OA EQUIPMENT

INDUSTRIAL MACHINERY EQUIPMENT

Materials FB series

Application Application product and functionMagnet’s shape

12B 12H 9N 9B 9H 6N 6B 6H 6E 5D 5DH 5N 5B 5H 3N 3G 5K 1A

Motor Fuel pump CPower wind lift motor CABS pump motor CBlower CWindow shield wiper CPower steering CActive suspension CStarter CDoor lock CMirror actuator CElectronic throttle motor CPower brake motor CAir-conditioner louver motor CRI,RIGenerator driving motor C

Sensor Antilock brake sensor sensing WSpeedometer DH,RIFuel oil level sensing W,DDistributor W

Others Generator CHolding W

Materials FB series



Personal-computer CD-ROM optical pick-up CCD-ROM loading CCD-ROM clamping DHCooling fan C

Printer Paper feeding C,CRI,RIHead actuator C,CRI,RICooling fan C

Copy-machine Drum rotation CRIPaper feeding C,CRICooling fan C

Facsimile Paper feeding C,CRI

Materials FB series



Robot Axial, joint movement C,WAutomation Table drive C,W

Conveyor C,WMagnetic chucks WMagnetic couplings RI

Elevators Servo motors CPower generators Power generators C

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HOME APPLIANCE

AUDIO VIDEO EQUIPMENT

MEDICAL/HEALTH CARE EQUIPMENT

OTHERS

Materials FB series

Application FunctionMagnet’s shape


Air conditioner Compressor CFan CCoolant flow rate valves CRIRoving CRI,RI

Washing machine Main drive C,WDoor sensing WWater supply pumps C

Refrigerator Compressor CAir filer Fan CMixer Drive motor CHair dryer Fan CShaver Drive motor CElectric tooth brush-ing

Drive motor C

Electric tool Drive motor CVarious pumps Drive motor C

Materials FB series



Videos/camcorders Loading CZooming CFocusing C

TV Deflection conversion WRadio cassette Capstan C

Reeling CCD, LD, MD Loading C

Optical pick-up CClamping DH

Headphone Headphone DHCamera Focusing C

Automatic winding motors CAutomatic rewinding motors C

Materials FB series



Medical equipment Blood circulation coupling DHAnalysis equipment Pump unit CMagnetic health care equipment

Mat, plaster, etc. DElectric bed motors C

Materials FB series



Toy Motor CMagnetic stands Holding RMagnetic latches Holding WBuzzer For oscillators RICellular/PHS Isolators D,W

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MAGNETIC, PHYSICAL AND MECHANICAL CHARACTERISTICS

WET-ANISOTROPIC MATERIALS

WET-ANISOTROPIC MATERIALS

∗ C//: Measured values in the direction of the easy axis of magnetization C⊥: Measured values in the perpendicular direction to the easy axis of magnetization

• [ ]: in the unit of SI, ( ): in the unit of CGS• Anisotropic Multi-Polar Ring Magnets: Please refer to the prescribed-mentioned "FEATURES and MAGNETIC CHARACTERISTICS of Anisotropic Multi-

Polar Ring Magnets"

Material FB12B FB12H FB9N FB9B FB9H FB6NComposition SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3

Residual flux densityBr

[mT] 470±10 460±10 460±10 450±10 430±10 440±10(kG) 4.7±0.1 4.6±0.1 4.6±0.1 4.5±0.1 4.3±0.1 4.4±0.1

Coercive forceHCB

[kA/m] 340±12 345±15 278.5±12 342.2±12 330.2±12 258.6±12(kOe) 4.3±0.15 4.3±0.19 3.5±0.15 4.3±0.15 4.15±0.15 3.25±0.15

Intrinsic coercive forceHCJ

[kA/m] 380±12 430±15 286.5±12 358.1±12 397.1±12 262.6±12

(kOe) 4.8±0.15 5.4±0.19 3.6±0.15 4.5±0.15 5.0±0.15 3.3±0.15

Maximum energy product(BH)max

[kJ/m3] 43.1±1.6 41.4±1.6 40.4±1.6 38.6±1.6 35.0±1.6 36.7±1.6

(MGOe) 5.4±0.2 5.2±0.2 5.1±0.2 4.9±0.2 4.4±0.2 4.6±0.2

Recoil permeabilityµrec

1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1

Temperature coefficient of Br∆ Br/Br/∆ T

[%/K] –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

(%/°C) –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

Curie temperatureTc

[K] 733 733 733 733 733 733(°C) 460 460 460 460 460 460

Coefficient of thermal expansion∆ L/L/∆ T

C//∗ [1/K](1/°C) 15× 10–6 15× 10–6 15× 10–6 15× 10–6 15× 10–6 15× 10–6

C⊥∗ [1/K](1/°C) 10× 10–6 10× 10–6 10× 10–6 10× 10–6 10× 10–6 10× 10–6

Specific heat[J/kg • K] 837 837 837 837 837 837(cal/g • °C) 0.2 0.2 0.2 0.2 0.2 0.2

Density[kg/m3] 5.07 to 5.17× 103 5.02 to 5.12× 103 5.0 to 5.1× 103 4.95 to 5.05× 103 4.9 to 5.0× 103 4.9 to 5.0× 103

(g/cm3) 5.07 to 5.17 5.02 to 5.12 5.0 to 5.1 4.95 to 5.05 4.9 to 5.0 4.9 to 5.0

Deflection strength[N/m2] 0.5 to 0.9× 108 0.5 to 0.9× 108 0.5 to 0.9× 108 0.5 to 0.9× 108 0.5 to 0.9× 108 0.5 to 0.9× 108

(kgf/mm2) 5 to 9 5 to 9 5 to 9 5 to 9 5 to 9 5 to 9Compressive strength

[N/m2] >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108

(kgf/mm2) >70 >70 >70 >70 >70 >70

Tensile strength[N/m2] 0.2 to 0.5× 108 0.2 to 0.5× 108 0.2 to 0.5× 108 0.2 to 0.5× 108 0.2 to 0.5× 108 0.2 to 0.5× 108

(kgf/mm2) 2 to 5 2 to 5 2 to 5 2 to 5 2 to 5 2 to 5

Material FB6B FB6H FB6E FB5N FB5B FB5HComposition SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3


[mT] 420±10 400±10 380±10 440±10 420±10 405±10(kG) 4.2±0.1 4.0±0.1 3.8±0.1 4.4±0.1 4.2±0.1 4.05±0.1

Coercive forceHCB

[kA/m] 302.4±12 302.4±12 290.5±12 226.8±12 262.6±12 298.4±12(kOe) 3.8±0.15 3.8±0.15 3.65±0.15 2.85±0.15 3.3±0.15 3.75±0.15


[kA/m] 318.3±12 358.1±12 393.9±12 229.2±12 266.6±12 322.3±12

(kOe) 4.0±0.15 4.5±0.15 4.95±0.15 2.88±0.15 3.35±0.15 4.05±0.15


[kJ/m3] 33.4±1.6 30.3±1.6 27.5±1.6 36.7±1.6 33.4±1.6 31.1±1.6

(MGOe) 4.2±0.2 3.8±0.2 3.45±0.2 4.6±0.2 4.2±0.2 3.9±0.2


1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1 1.05 to 1.1


[%/K] –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

(%/°C) –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

Curie temperatureTc

[K] 733 733 733 733 733 733(°C) 460 460 460 460 460 460


C//∗ [1/K](1/°C) 15× 10–6 15× 10–6 15× 10–6 15× 10–6 15× 10–6 15× 10–6

C⊥∗ [1/K](1/°C) 10× 10–6 10× 10–6 10× 10–6 10× 10–6 10× 10–6 10× 10–6






[N/m2] >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108

(kgf/mm2) >70 >70 >70 >70 >70 >70



(12/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC AND DRY-ISOTROPIC MATERIALS(FB1A)

∗ C//: Measured values in the direction of the easy axis of magnetization C⊥: Measured values in the perpendicular direction to the easy axis of magnetization

• [ ]: in the unit of SI, ( ): in the unit of CGS

Material FB5D FB5DH FB3N FB3G FB3X FB1AComposition SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 SrO6Fe2O3 BaO6Fe2O3


[mT] 415±10 400±10 395±15 375±15 375±15 220±15(kG) 4.15±0.1 4.00±0.1 3.95±0.15 3.75±0.15 3.75±0.15 2.2±0.15

Coercive forceHCB

[kA/m] 254.6±12 278.6±12 234.8±12 254.6±16 234.8±12 159.2±16(kOe) 3.2±0.15 3.5±0.15 2.95±0.15 3.2±0.2 2.95±0.15 2.0±0.2


[kA/m] 262.6±16 318.3±16 238.7±16 270.6±16 238.7±16 258.6±20

(kOe) 3.3±0.2 4.0±0.2 3.0±0.2 3.4±0.25 3.0±0.2 3.25±0.25


[kJ/m3] 32.6±1.6 30.3±1.6 28.7±2.4 25.9±2.4 25.9±2.4 8.9±1.6

(MGOe) 4.1±0.2 3.8±0.2 3.6±0.3 3.25±0.3 3.25±0.3 1.1±0.2


1.05 to 1.10 1.05 to 1.10 1.1 to 1.2 1.1 to 1.2 1.1 to 1.2 1.1 to 1.2


[%/K] –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

(%/°C) –0.18 –0.18 –0.18 –0.18 –0.18 –0.18

Curie temperatureTc

[K] 733 733 733 733 733 723(°C) 460 460 460 460 460 450


C//∗ [1/K](1/°C) 15× 10–6 15× 10–6 15× 10–6 15× 10–6 15× 10–6 12× 10–6

C⊥∗ [1/K](1/°C) 9× 10–6 9× 10–6 9× 10–6 9× 10–6 9× 10–6 12× 10–6






[N/m2] >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108 >6.9× 108

(kgf/mm2) >70 >70 >70 >70 >70 >70



(13/33)

001-03 / 20081104 / e321.fm


DEMAGNETIZATION CURVES/MAGNETIC CHARACTERISTICS

WET-ANISOTROPIC MATERIAL FB12BDEMAGNETIZATION CURVE



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

–60˚C

–20˚C

20˚C

60˚C

100˚C

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

B-H CurveJ-H Curve


[mT] 470±10(kG) 4.7±0.1

Coercive forceHCB

[kA/m] 340±12(kOe) 4.3±0.15


[kA/m] 380±12(kOe) 4.8±0.15


[kJ/m3] 43.1±1.6(MGOe) 5.4±0.2

(14/33)

001-03 / 20081104 / e321.fm


WET-ANISOTROPIC MATERIAL FB12HDEMAGNETIZATION CURVE



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

–60˚C

–20˚C

20˚C

60˚C

100˚C

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

B-H CurveJ-H Curve


[mT] 460±10(kG) 4.6±0.1

Coercive forceHCB

[kA/m] 345±15(kOe) 4.3±0.19


[kA/m] 430±15(kOe) 5.4±0.19


[kJ/m3] 41.4±1.6(MGOe) 5.2±0.2

(15/33)

001-03 / 20081104 / e321.fm


WET-ANISOTROPIC MATERIAL FB9NDEMAGNETIZATION CURVE




[mT] 460±10(kG) 4.60±0.1

Coercive forceHCB

[kA/m] 278.5±12(kOe) 3.5±0.15


[kA/m] 286.5±12(kOe) 3.6±0.15


[kJ/m3] 40.4±1.6(MGOe) 5.1±0.2

0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

–60˚C

–20˚C

20˚C

60˚C

100˚C

(BH)max[kJ/m3]

50

40

30

20

10

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

B-H CurveJ-H Curve

(16/33)

001-03 / 20081104 / e321.fm





0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

–60˚C

–20˚C

20˚C

60˚C

100˚C

B-H CurveJ-H Curve


[mT] 450±10(kG) 4.50±0.1

Coercive forceHCB

[kA/m] 342.2±12(kOe) 4.3±0.15


[kA/m] 358.1±12(kOe) 4.5±0.15


[kJ/m3] 38.6±1.6(MGOe) 4.9±0.2

(17/33)

001-03 / 20081104 / e321.fm





0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

–60˚C

–20˚C

20˚C

60˚C

100˚C

B-H CurveJ-H Curve


[mT] 430±10(kG) 4.30±0.1

Coercive forceHCB

[kA/m] 330.2±12(kOe) 4.1 5±0.15


[kA/m] 397.9±12(kOe) 5.0±0.15


[kJ/m3] 35.0±1.6(MGOe) 4.4±0.2

(18/33)

001-03 / 20081104 / e321.fm



FEATURES• FB6N has high Br-value and fits downsized high-performance

motors or generators.



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

–60˚C

–20˚C

20˚C

60˚C

100˚C

(BH)max(MGOe)

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

B-H CurveJ-H Curve


[mT] 440±10(kG) 4.4±0.1

Coercive forceHCB

[kA/m] 258.6±12(kOe) 3.25±0.15


[kA/m] 262.6±12(kOe) 3.3±0.15


[kJ/m3] 36.7±1.6(MGOe) 4.6±0.2

(19/33)

001-03 / 20081104 / e321.fm



FEATURES• FB6B is high Br with high Hc, and fits power motors which are

required strong resistance to demagnetization.



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

–60˚C

–20˚C

20˚C

60˚C

100˚C

(BH)max(MGOe)

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

B-H CurveJ-H Curve


[mT] 420±10(kG) 4.2±0.1

Coercive forceHCB

[kA/m] 302.4±12(kOe) 3.8±0.15


[kA/m] 318.3±12(kOe) 4.0±0.15


[kJ/m3] 33.4±1.6(MGOe) 4.2±0.2

(20/33)

001-03 / 20081104 / e321.fm



FEATURES• FB6H is high Br with high Hc, and fits starter motors of

automotive and motor cycle which are required strong

resistance to demagnetization.



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 400±10(kG) 4.0±0.1

Coercive forceHCB

[kA/m] 302.4±12(kOe) 3.8±0.15


[kA/m] 358.1±12(kOe) 4.5±0.15


[kJ/m3] 30.3±1.6(MGOe) 3.8±0.2

(21/33)

001-03 / 20081104 / e321.fm


WET-ANISOTROPIC MATERIAL FB6EDEMAGNETIZATION CURVE

FEATURES• FB6E has high HCJ, and fits starter motors of automotive and

motor cycle which are required strong resistance to

demagnetization.



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 380±10(kG) 3.8±0.1

Coercive forceHCB

[kA/m] 290.5±12(kOe) 3.65±0.15


[kA/m] 393.9±12(kOe) 4.95±0.15


[kJ/m3] 27.5±1.6(MGOe) 3.45±0.2

(22/33)

001-03 / 20081104 / e321.fm



FEATURES• FB5N is high cost-performance material with high Br-value.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 440±10(kG) 4.4±0.1

Coercive forceHCB

[kA/m] 226.8±12(kOe) 2.85±0.15


[kA/m] 229.2±12(kOe) 2.88±0.15


[kJ/m3] 36.7±1.6(MGOe) 4.6±0.2

(23/33)

001-03 / 20081104 / e321.fm



FEATURES• FB5B is high cost-performance material with high Br- and

relatively high HCJ-values, which fits a wide variety of motor

applications.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 420±10(kG) 4.2±0.1

Coercive forceHCB

[kA/m] 262.6±12(kOe) 3.3±0.15


[kA/m] 266.6±12(kOe) 3.35±0.15


[kJ/m3] 33.4±1.6(MGOe) 4.2±0.2

(24/33)

001-03 / 20081104 / e321.fm



FEATURES• FB5H is high cost-performance material with high Br- and

relatively high HCJ-values, which fits power motors with strong

demagnetization resistance.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 405±10(kG) 4.05±0.1

Coercive forceHCB

[kA/m] 298.4±12(kOe) 3.75±0.15


[kA/m] 322.3±12(kOe) 4.05±0.15


[kJ/m3] 31.1±1.6(MGOe) 3.9±0.2

(25/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC MATERIAL FB5DDEMAGNETIZATION CURVE

FEATURES• Magnetic characteristics that rival wet-molded magnets.

• HCJ temperature characteristics have improved by 30%.

• Supports small sizes and complex shapes.



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

–60˚C

–20˚C

20˚C

60˚C

100˚C

B-H CurveJ-H Curve


[mT] 415±10(kG) 4.15±0.1

Coercive forceHCB

[kA/m] 254.6±12(kOe) 3.2±0.15


[kA/m] 262.6±20(kOe) 3.3±0.2


[kJ/m3] 32.6±1.6(MGOe) 4.1±0.2

(26/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC MATERIAL FB5DHDEMAGNETIZATION CURVE



0

0(kOe)

[kA/m]–H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

4

3

( kG

)

B, J

[ mT

]

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0–B/H

(BH)max[kJ/m3]

50

40

30

20

10

–60˚C

–20˚C

20˚C

60˚C

100˚C

B-H CurveJ-H Curve


[mT] 400±10(kG) 4.00±0.1

Coercive forceHCB

[kA/m] 278.6±12(kOe) 3.5±0.15


[kA/m] 318.3±20(kOe) 4.0±0.2


[kJ/m3] 30.3±1.6(MGOe) 3.8±0.2

(27/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC MATERIAL FB3NDEMAGNETIZATION CURVE

FEATURES• FB3N is high Br dry-molded material with high HCJ-value, and

fits various kinds of applications, which require small and

complex shaped magnets with high performance.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 395±15(kG) 3.95±0.15

Coercive forceHCB

[kA/m] 234.8±12(kOe) 2.95±0.15


[kA/m] 238.7±16(kOe) 3.0±0.2


[kJ/m3] 28.7±2.4(MGOe) 3.6±0.3

(28/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC MATERIAL FB3GDEMAGNETIZATION CURVE

FEATURES• These dry molded magnets with high Hc values and reduced

low-temperature demagnetization deliver excellent characteris-

tics in applications with large demagnetizing fields.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 375±15(kG) 3.75±0.15

Coercive forceHCB

[kA/m] 254.6±16(kOe) 3.2±0.2


[kA/m] 270.6±20(kOe) 3.4±0.25


[kJ/m3] 25.9±2.4(MGOe) 3.25±0.3

(29/33)

001-03 / 20081104 / e321.fm


DRY-ANISOTROPIC MATERIAL FB3XDEMAGNETIZATION CURVE



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

2

1

0

5

3

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 375±15(kG) 3.75±0.15

Coercive forceHCB

[kA/m] 234.8±12(kOe) 2.95±0.15


[kA/m] 238.7±16(kOe) 3.0±0.2


[kJ/m3] 25.9±2.4(MGOe) 3.25±0.3

(30/33)

001-03 / 20081104 / e321.fm


DRY-ISOTROPIC MATERIAL FB1ADEMAGNETIZATION CURVE

FEATURES• These dimensionally accurate isotropic magnets deliver stable

characteristics.

• They offer excellent cost performance and are best suited for

applications that do not require strong magnetic fields.



0

0(kOe)

[kA/m]–H

–B/H

6

450 400 350 300 250 200 150 100 50

5 4 3 2 1

100

0

200

300

400

500

1

0

5

3

4

B, J

–60˚C

–20˚C

20˚C

60˚C

100˚C

5.0

4.0

3.0

2.0

1.0

0.7

0.5

0.3

1.0 1.5 2.0 3.0 5.0

( kG

)

[ mT

]

(BH)max(MGOe)

B-H CurveJ-H Curve


[mT] 220±15(kG) 2.2±0.15

Coercive forceHCB

[kA/m] 159.2±16(kOe) 2.0±0.2


[kA/m] 258.6±20(kOe) 3.25±0.25


[kJ/m3] 8.9±1.6(MGOe) 1.1±0.2

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TYPICAL SHAPES AND PRODUCT IDENTIFICATIONS

We offer support for products with unusual and complex shapes, as well as for smaller or larger products in addition to the nine standard shapes shown in the list. Please contact us for details.

PRODUCT IDENTIFICATIONSAn example of a basic item

(1) Material name(2) Shape(3) Size(4) TDK internal code

An example of special items which have an "S" or other alphabeti-cal letters added in front of the shape code (2).

Example FB4X SDH 60× 32× 10 K

Shape codes for products of similar shapes are denoted by the direction of magnetization for anisotropic products and by dimensional proportions for isotropic products.

: Direction of magnetization : Direction of pressure

FB4X DH 60× 32× 10 K(1) (2) (3) (4)

Shape Condition to determine "Shape" codeDimensional condition

Shape codeExpression method

Cylindrical/DiskAnisotropic product: Magnetization direction b —

D Da× b

Isotropic product: Dimensional ratio a >b a >b

Anisotropic product: Magnetization direction a —R Ra× b

Isotropic product: Dimensional ratio a b a b

Ring/Disk with holeAnisotropic product: Magnetization direction c —

DH DHa× b× c

Isotropic product: Dimensional ratio a >c a>c, a/2 b

Anisotropic product: Magnetization direction a —RH RHa× b× c

Isotropic product: Dimensional ratio a c a c, a/2 b

Anisotropic product: Magnetization direction Radial —RI RIa× b× c

Isotropic product: Dimensional ratio a/2 b a/2 b

Anisotropic product: Magnetization direction Pole to pole

— CRI CRIa× b× c

BlockAnisotropic product: Magnetization direction c a b

W Wa× b× c

Isotropic product: Dimensional ratio c a b

Block with holeAnisotropic product: Magnetization direction c a b

WH WHa× b× c

Isotropic product: Compression direction c a b

ArcAnisotropic product: Magnetization direction c —

C Ce× f× bAnisotropic product: Magnetization direction Radial —

Isotropic product —

b

øa

b

øa

c

øa

øb

øa

øb

c

øa

c

øb

ba

c

ba

c

ød

øf øe

cd a

b

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DIMENSIONAL TOLERANCES

Ferrite magnets contract by 40 to 50% in volume during the main baking process. To ensure a high degree of dimensional accuracy, we

have optimized the manufacturing conditions in all of our processes, from raw material acceptance to baking, and have also implemented

a stringent process management system. Even so, the contraction rates of individual products may vary. Therefore, if a baked product

does not satisfy our standard dimensional tolerances, it undergoes a grinding process at the final stage of the standard process to ensure

that all products meet our standards. We can also meet our customers’ demands for high-precision products by applying various grinding

processes in addition to our standard grinding process. However, because ferrite magnet grinding involves the use of expensive grinding

tools such as diamond grinders, products with dimensional specifications that exceed our standard dimensional tolerances will cost more.

If you are seeking to reduce the development cost of your applied product, we recommend that you adopt the general dimensional toler-

ances of the standard process as the standard for your design.

D/R TYPE

DH/RH TYPE

RI TYPE

∗1 The larger of the two values is applied.∗2 Please consult us if the dimensional tolerance after grinding does not satisfy your requirements.• The values above correspond to standard dimensions. Please contact us for larger products because the above values may not apply.

W/WH TYPE

Shape ItemStandard process

General dimensional tolerances in the standard process.

Dimensional tolerances after grinding∗2

Diameter a No grindingAnisotropic: ±2% or ±0.3mm of standard dimension ∗1 ±0.1mm

Isotropic: ±1% or ±0.2mm of standard dimension∗1 ±0.1mm

Thickness (Height) b

: GrindingAnisotropic: ±0.1mm of standard dimension∗2 —

Isotropic: ±0.1mm of standard dimension∗2 —

Shape ItemStandardprocess



Outer diameter a

No grindingAnisotropic: ±2% or ±0.3mm of standard dimension∗1 ±0.1mm


Inner diameter b



Thickness (Height) c






Outer diameter a



Inner diameter b


Isotropic: ±1.5% or ±0.3mm of standard dimension∗1 ±0.1mm


No grindingAnisotropic: ±2.5% or ±0.3mm of standard dimension∗1 ±0.1mm

Isotropic: ±2.5% or ±0.3mm of standard dimension∗1 ±0.1mm




Length a/Width b




No grindingAnisotropic: ±0.1mm of standard dimension∗2 —


Inner diameter d

: GrindingAnisotropic: ±2% or ±0.3mm of standard dimension∗1 ±0.1mm


b

øa

b

øa

c

øa

c

øa

øb

øb

øa

øb

c

ba

c

ba

c

ød

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001-03 / 20081104 / e321.fm


CRI TYPE (Anisotropic multi-polar, ring type)

C TYPE (Anisotropic, arc type)

∗1 The larger of the two values is applied.∗2 Please consult us if the dimensional tolerance after grinding does not satisfy your requirements.• The values above correspond to standard dimensions. Please contact us for larger products because the above values may not apply.




Outer diameter a

: Grinding +0, –0.05mm of standard dimension∗2 —

Inner diameter b

No grinding ±2% or ±0.3mm of standard dimension∗1 ±0.1mm


No grinding ±2.5% or ±0.3mm of standard dimension∗1 ±0.1mm øa

øb

c




Width a No grinding ±2% or ±0.3mm of standard dimension∗1 ±0.2mm

Length b No grinding ±2% or ±0.3mm of standard dimension∗1 ±0.2mm

Thickness c

: Grinding

±0.15mm of standard dimension∗2 —

Height d ±0.3mm of standard dimension∗2 —

Outer diameter e (Radius)


Inner diameter f (Radius)


f e

cd a

b

ferrite magnets - fumaw.com.t · (1/33) 001-03 / 20081104 / e321.fm • all specifications are...

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