Permanent Magnets

Industries we Serve

Automotive Consumer

Electronics Appliances Medical Military /

Aerospace Office

Automation

Motor Shell Assemblies

Sensor Assemblies

Magneto Starters

Pump Assemblies

Our Magnet Family

Permanent Magnets

Cast Sintered Bonded Other

Alnico Alnico

Ferrite

SmCo

NdFeB

Calendared Compression

Injection

Ferrite Ferrite

SmCo

NdFeB

Ferrite

SmCo

NdFeB

Magnet Steel

PtCo

Cunife

Lodex

Vicalloy

Remalloy

FeCrCo

Issues When Designing for a Magnet

Items to consider when specifying a permanent magnet in an application

The material to be used

Alnico Ferrite Samarium Cobalt Neodymium Iron Boron Cunife Iron Chrome Cobalt

Magnet CharacteristicsMaterials Typical Shapes Pro Con

Cast AlnicoAlNiCo

Rods, Bars, U shapeand other cast type

High BrHigh working TGood T coef.

Very Low HcHigh costHigh L/D

Requires Cast

Sintered AlnicoAlNiCo

Powder pressed to shapeComplex shapes

High Br, T

Requires ToolHigh costLow market

Ceramic/FerriteSrFe2O3

Blocks, Rings, Arcs, DiscsMost flux for $

High usageLow corrosion

Low BrRequires tool

Simple shapes

SamariumCobaltSmCo

Blocks, Rings, DiscsArcs, Segments

No corrosionVery low T coefStable, No tool

Very expensiveSimple shapes

High Co content

NeodymiumNdFeB

Blocks, Rings, DiscsArcs, Segments

Highest magnetic properties

No tooling

CorrodesLow working TDifficult to Mag

Bonded GradesAll materials

Difficult geometriesCan be insert molded

or over-molded

Complex shapesVarious resins

High toolingLow magneticsHigh volumes

The method of manufacture

Cast

Sintered

Bonded Calendared Injection molded Compression molded Extruded

Typical Magnet Shapes

Sintered:

RingDiscArcRodCylinderBreadloafSegment

Bonded:

It is up to yourimagination

Sample Data Sheets

Coating and Plating

Material 1 e-

coat 2

Epoxy 3

Nickel 4

Zinc 5 Paralene Method of coating Coating thickness Color or luster

NdFeB Coatings

Properties Organic: E-Coat Metallic: Nickel Plating

Application TypeImmersion Electrodeposition

Epoxy/UrethaneWater Based

ImmersionBarrel

ElectroplateElectroless

Pretreat ProcessAlkaline Clean

Acid Etch/Passivate

Alkaline CleanElectroclean

Acid Etch/Activate

Thickness15-25

(0.6-1.0 mil)10-50

(0.4-2.0 mil)

Uniformity(Flatness/Edges)

Excellent20% Edge Loss

Good50% Edge Gain

DurabilityGood

Pencil 2H-4HExcellent

300-1000 V100

Temp and Humidityat 85C and 85% RH

250 Hours Over 1200 Hours

Magnetization

Direction of magnetization (orientation) Magnetized Not magnetized

Magnetization Styles

Simple

to

Complex

Test Methods

Helmholtz coils Total flux Permeameter Functional test fixture Drop through (go, no-go)

gauges Snap gauges