Question

Problem 84: A given load is driven by a 480 V six-pole 150 hp three-phase synchronous motor with the following load and motor data. Determine the voltage Ē, necessary for this operating condition. Note: assume that the rotational loss torque is negligible. Load: T1 = 0.05* w Nm Motor: Ey = 400 V; Xa = 11 Answer: Ēr = 4002-17.36° V Problem 85: A given load is driven by a 480 V four-pole 150 hp three-phase synchronous motor with the following load and motor data. Determine the voltage Es necessary for this operating condition. Note: assume that the rotational loss torque is negligible. Load: T, = 0.01 * w Nm and TRL = 0.07 * W, Nm Motor: Ey = 380 V; Xd = 1.25 Answer: Ēr = 3802-15.95° V Problem 86: A given load is driven by a 2300 V eight-pole 500 hp three-phase synchronous motor with the following load and motor data. Determine the current ī, that is necessary for this operating condition. Load: Ti = 0.4* w Nm and Tru = 0.6* W, Nm Motor: Ey = 2000 V; Xd = 52 Answer: T = 151.5255.7° V

Answer 1

Problem 86: Given load voltage. V voltage. V: 2300 V Vr 2 2300 13 2 1327.9v of poces..p? 8 0.4 Wr? N-m Load torque Ef 2000 v 8 xd 2.52 we know, Wy 210 x 120f 2TNS 60 px 60 Wr чо f Р f is not given, ut fa 60 Hz UoX60 Wia 30 II sad/s 8 we know, 3 Load torque. To ef. Vo xd sin 8 0.4 Wr? 3 2000 x 1329,9 X sind w v 5 -> sin sa 0.21 82 12. 1220

ala 2 from diagram (la xs)" = E + VE Ef + Ve”- 2 Ep vt coss ({axs)" (2000)* +(622.9)” – @(2000)(1327.9) Cos (12.12) laxs > 520 156.26 여 La 2 520156.75 25 22,80 6.27 1 la 2 151.017 we know, Pr. 2 B.Vt la coso Ve. Ef 3.vc. lacoso sind Xs Cos o 2000 x 1322.9 x sin 12.12 x B 2 √3 x 5x 151.019 x12229 2 0.564 2 55.66 292 151.2 255.66