LIST OF PRINCIPAL SYMBOLS xvii 



Symbol. Meaning . 



v Velocity 59 



v Volts per ampere turn 155 



V Volume 39 



to, w p Pole width 90, 166 



W Energy 39 



\\" Density of energy 240 



Wm Mechanical work done 250 



W 9 Energy stored in the magnetic field 250 



x Reactance 144 



Angle 69 



a Coefficient 220 



/? Phase angle 150 



r Angle 75 



Brush shift in cm 163 



e Eddy-current constant 51 



"- Winding pitch 71 



7; Hysteresis coefficient 48 



Angle 253 



A Tooth pitch 93 



/J. Pjermeability 11 



v Reluctivity 11 



r Pole pitch 64 



</> External phase angle 144 



Internal phase angle 144 



'/' Flux 7 



m Maximum value of the flux 81 



<Dp I lux in the path of the partial linkages 182 



0, Primary leakage flux 86 



01 Secondary leakage flux 86 



1 Form factor 65 



fa Amplitude factor 84 



Angle between current and no-load e.m.f 144 



oj Angle LD7 



