SYMBOLS 
USED IN DYNAMO CALCULATION, 
The following is a list of the principal symbols used in connee- 
tion with dynamo calculations: 
AT = Total number of ampere turns. 
at, ia meppsre turns required for armature core. 
at, = e oe ‘* air gaps. 
atm _ ees zit < ‘* magnet frame. 
at, = ee ay * ‘* armature reaction. 
B, = Radial thickness of armature core. 
B, = Magnetic flux density in armature core. 
B, = +16 e ‘*  ** air gaps (field density). 
B. = 7 we ‘< ** magnet frame. 
C = Current. 
c¢ = Circumferential current density. 
C. M. = Circular mils. 
DD. = Diameter of armature core. 
Go = ne ‘¢ conductor. 
Dyn = “* — * magnet core. 
dn —_ ‘<“ 66 6< wire. 
E = EK. M. F. of armature. 
E' = Counter E. M. F. of motor. 
Eff = Efficiency. 
g = Factor of eddy current er in armature. 
t 2 = Freauency 
PD = Flux rs | 
ha = Height of winding space on armature (depth of slot). 
H. P. = Horse-power. 
4 = Factor of hysteresis loss in armature. 
