ASTM_A_340_-_17.pdf

Designation:A34017Standard Terminology ofSymbols and Definitions Relating to Magnetic Testing1This standard is issued under the fixed designation A340;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONIn preparing this glossary of terms,an attempt has been made to avoid,where possible,vectoranalysis and differential equations so as to make the definitions more intelligible to the average workerin the field of magnetic testing.In some cases,rigorous treatment has been sacrificed to securesimplicity,but it is believed that none of the definitions will prove to be misleading.It is the intent of this glossary to be consistent in the use of symbols and units with those found inANSI/IEEE 260-1978 and USA Standard Y 10.5-1968.Part 1Symbols Used in Magnetic TestingSymbolTermcross-sectional area of B coilAcross-sectional area of specimenAsolid areaBHmagnetic flux densitymagnetic inductionBexcursion range of inductionBbbiased inductionBdremanent inductionBdmremanenceBdHdenergy product(BdHd)mmaximum energy productBincremental inductionBiintrinsic inductionBmmaximum induction in a hysteresis loopBmaxmaximum induction in a flux current loopBrresidual inductionBrsretentivityBssaturation inductioncfcrest factorCMcyclically magnetized conditiondlamination thicknessDBdemagnetizing coefficientdfdistortion factorDmmagnetic dissipation factorEexciting voltageE1induced primary voltageE2induced secondary voltageEfflux voltsfcyclic frequency in hertzmagnetomotive forceffform factorHmagnetic field strengthHexcursion range of magnetic field strengthHbbiasing magnetic field strengthHcBcoercive field strengthHcJintrinsic coercive field strengthHddemagnetizing field strengthHincremental magnetic field strengthHgair gap magnetic field strengthHLac magnetic field strength(from an assumedpeak value of magnetizing current)Hmmaximum magnetic field strength in a hyster-esis loopHmaxmaximum magnetic field strength in a flux-current loopHpac magnetic field strength(from a measuredpeak value of exciting current)Htinstantaneous magnetic field strength(coinci-dent with Bmax)Hzac magnetic field strength force(from an as-sumed peak value of exciting current)Iac exciting current(rms value)Icac core loss current(rms value)Idcconstant currentImac magnetizing current(rms value)Jmagnetic polarizationkcoupling coefficient!flux path length!1effective flux path length!ggap length+(also N)flux linkage+mmutual flux linkage1This terminology is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.92 onTerminology and Definitions.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1949.Last previous edition approved in 2016 as A340 161.DOI:10.1520/A0340-17.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 Lself inductanceL1core inductanceLincremental inductanceLiintrinsic inductanceLmmutual inductanceL0initial inductanceLsseries inductanceLwwinding inductancemmagnetic momentMmagnetizationmtotal mass of a specimenm1active mass of a specimenNDdemagnetizing factorN1turns in a primary windingN2turns in a secondary windingN1I/!1ac excitationpmagnetic pole strength3permeancePactive(real)powerPaapparent powerPa(B;f)specific apparent powerPctotal core lossPc(B;f)specific core lossPcincremental core lossPenormal eddy current core lossPeincremental eddy current core lossPhnormal hysteresis core lossPhincremental hysteresis core lossPqreactive(quadrature)powerPrresidual core lossPwwinding loss(copper loss)Pzexciting powerPz(B;f)specific exciting powerQmmagnetic storage factor5reluctanceR1core resistanceRwwinding resistanceSlamination factor(stacking factor)SCMsymmetrically cyclically magnetized conditionTcCurie temperaturewlamination widthWhhysteresis loop loss linear expansion,coefficient(average)incremental tolerancehysteretic angleloss anglecos magnetic power factorpproton gyromagnetic ratio0magnetic constantdensitysusceptibilityac Permeabilities:aideal permeabilityLinductance permeabilityLincremental inductance permeability0dinitial dynamic permeabilityppeak permeabilitypincremental peak permeabilityiinstantaneous permeabilityzimpedance permeabilityzincremental impedance permeabilitydc Permeabilities:normal permeabilityabsabsolute permeabilityddifferential permeabilityincremental permeabilityeffeffective circuit permeabilityiincremental intrinsic permeabilit