7-7. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 15 hp. Its equivalent circuit components are
| R1 = 0.220 Ω | R2 = 0.127 Ω | XM = 15.0 Ω |
| X1 = 0.430 Ω | X2 = 0.430 Ω | |
| Pmech = 300 W | Pmisc ≈ 0 | Pcore = 200 W |
For a slip of 0.05, find
(a) The line current IL
(b) The stator copper losses PSCL
(c) The air-gap power PAG
(d) The power converted from electrical to mechanical form Pconv
(e) The induced torque τind
(f) The load torque τload
(g) The overall machine efficiency
(h) The motor speed in revolutions per minute and radians per second
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