UKLAV MKASrUI.NC IXjll I'M KNT i 



estimates or measurements of the inertia and other forces which also 

 occur. The (hrect measurement of (l3'namic performance; is described in 



;i lat(M' section. 



The Mcdsuroncnl of Flux 



The mechanical output of a magnet depends on its maj2;netic ([uality. 

 As is shown in companion articles in this issu(\ it is important for the 

 (lesii;ner to know the \-alues of the closed gap reluctance (iiu , the leakage 

 reluctance (iU , and the effective pole face area A. Beside these important 



? 300 



0.01 0.02 0.03 0.04 



ARMATURE TRAVEL IN INCHES 



Kig. 2 — Tyi)ical recording of rehi}' ix'rfurinaiice made on Instron machine. 



