No-load Current Basics: Practical Guidelines for Assessment

1 EASA CURRENTS February 2005 Applied Voltage (% Of Rated)ABCurrent25%125%100%75%50%Full load CurrentContinued On Page 2No- load Current basics : Practical Guidelines For AssessmentBy Chuck YungEASA Technical Support SpecialistHow much No-load Current shouldI expect when testing a motor? Wewould like to have a ratio of no-loadamps / full- load amps, for qualitycontrol purposes.**Many of us expect a motor todraw approximately one-third of ratedcurrent, when operating from ratedvoltage on our test panel. That is agood rule of thumb most of thetime. While there are lots of excep-tions, most of them are explain the rule of thumb andthe exceptions, we will use someterms familiar to most readers:FLA = Full- load ampsNLA = No-load amps; this ismagnetizing Current plus somelosses (mostly windage) flux = Lines of magnetic forceAGD = Airgap density ; in lines offlux per unit areaV = Applied voltageHere are some exceptions youproba

saturation (Point B, Figure 1). When the stator core becomes saturated, it takes a disproportionate amount of ... The higher the flux density, the higher the ratio current is likely to be. • The higher the flux density, the higher the no-load current will be as a percentage of FLA.

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  Guidelines, Basics, Practical, Current, Load, Density, Flux, Saturation, Flux density, Practical guidelines, Load current basics

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