24= 7.5 + 10 j ohms, c0 = 0.4, A = 0.04; SINGLE-PHASE COMMUTATOR MOTORS 413 Self-inductive impedance arma- ture : Zi = 0.025 + 0.075 j ohms, Self-Inductive impedance, brush short-circuit: Reduction factor, main field: brush short-circuit that is, the same constants as used in the repulsion motor, Fig. 188. Curves are plotted for the voltage ratios: t = 0: inductively compensated series motor, Fig. 189. t = 0.2: series repulsion motor, high-speed, Fig. 190. t = 0.5: series repulsion motor, medium-speed, Fig. 191. t = 1.0: repulsion motor with secondary excitation, low-speed, Fig. 192. 900 e - 500 VOLTS (-fz «. i j Z- 0.25 +3 j Z1-0025+0.075j Z= 0.25 -1- 2.5 J Z2- O.O25+ O.O75J -«• 0,3 J Z4=7,5,0 H- 10 j 0.4 (?4*0.04 0.2 0.4 C.6 0.8 1.0 12 1.4 1.6 1.8 2.0 2.2 2.4 BOO 550 FIG. 192.—Repulsion motor, secondary excitation. It is, from above constants: Z3 = Zi + Co2 (Zo + 2) = 0.08 + 0.60 j. A3 = ~j* =0.202-0.010 y. A = |F « 0.835-0,OUj. *2 = |? =0.031 - 0.007 j. ^4 « Z .. = 0.179 + 0.087j. k — ^ = 1D !':f /, -