7-14. A 440-V, 50-Hz, two-pole, Y-connected induction motor is rated at 75 kW. The equivalent circuit parameters are R₁ = 0.075 Ω Χ1 = 0.17 Ω PF&W = 1.0 kW R₂ = 0.065 Ω XM = 7.22 X₂ = 0.172 Pmisc = 150 W Pcore = 1.1 kW For a slip of 0.04, find (a) The line current I (b) The stator power factor (c) The rotor power factor (d) The stator copper losses PSCL (e) The air-gap power PAG (f) The power converted from electrical to mechanical form P (g) The induced torque Tind (h) The load torque Tload (i) The overall machine efficiency (j) The motor speed in revolutions per minute and radians per second

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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7-14. A 440-V, 50-Hz, two-pole, Y-connected induction motor is rated at 75 kW. The
equivalent circuit parameters are
R₁ = 0.075 Ω
Χ1 = 0.17 Ω
PF&W
= 1.0 kW
R₂ = 0.065 Ω
XM = 7.22
X₂ = 0.172
Pmisc
= 150 W
Pcore = 1.1 kW
For a slip of 0.04, find
(a) The line current I
(b) The stator power factor
(c) The rotor power factor
(d) The stator copper losses PSCL
(e) The air-gap power PAG
(f) The power converted from electrical to mechanical form P
(g) The induced torque Tind
(h) The load torque Tload
(i) The overall machine efficiency
(j) The motor speed in revolutions per minute and radians per second
Transcribed Image Text:7-14. A 440-V, 50-Hz, two-pole, Y-connected induction motor is rated at 75 kW. The equivalent circuit parameters are R₁ = 0.075 Ω Χ1 = 0.17 Ω PF&W = 1.0 kW R₂ = 0.065 Ω XM = 7.22 X₂ = 0.172 Pmisc = 150 W Pcore = 1.1 kW For a slip of 0.04, find (a) The line current I (b) The stator power factor (c) The rotor power factor (d) The stator copper losses PSCL (e) The air-gap power PAG (f) The power converted from electrical to mechanical form P (g) The induced torque Tind (h) The load torque Tload (i) The overall machine efficiency (j) The motor speed in revolutions per minute and radians per second
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