94 THE BKLL SYSTEM TECHXICAL JOXRXAL, JANUARY 1954 



Table I — Evaluation of Magnetic Circuit Constants 



mine(i in Fig. 7, and the \-aliie of (Re determined in Fig. 3. These vahies 

 have been substituted in equations (7) to determine the component 

 terms of (Re . 



The constants applying to Fig. 5 are of interest primarily for compari- 

 son ^\dth the values computed from the design, as discussed in the com- 

 panion article. While formall}' required to evaluate the high density 

 magnetization relations, they are not explicitly reciuired in estimating 

 the high density pull, as is shown in a later section. 



The reluctance (R^ of equations (4) and (5) can be evaluated experi- 

 mentally through the full range of the magnetization measurements 

 when the magnetomotive force measurements are available. Thus Figs. 

 1 and 3 can be used to determine values of <p and ^e (or -J — 5c) for 

 corresponding values of CF and x. In this way there have been obtained 

 the curves of (R^ plotted against ^e for various values of x in Fig. 10. 

 These curves are included here merely to illustrate the approximate 

 validity of (4), in which (Re is taken as independent of (p. The departures 

 from this condition are minor except for the smaller gaps at high values 



FLUX, ^, IN MAXWELLS 

 1500 2000 2500 3000 



3500 4000 



Fig. 10 



4 6 8 10 12 14 



Je/477" in ABAMPERE TURNS 



Reluctance curves for magnetic path external to the core. 



