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A 75 kW, 440 V, V-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short circuited at the slip rings. Take X1-X2- 0.5 a /ph ,and assume the stator resistance to be negligible. Find: maximum torque and starting torque? The solution Given: E- 440 V -0.04 --0.2 Calculate the stator speed; N. - N. - N. - 1O00 rpm Calculate resistance R-0.2x0. s Cakculate the starting torque T.s T - 35.5N-m Caleulate the manimum torque T T T .07 N Question /If the rotor resistance is now doubled by adding an external series resistance, determine: maximum torque ?

A 75 kW, 440 V, V-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short circuited at the slip rings. Take X1-X2- 0.5 a /ph ,and assume the stator resistance to be negligible. Find: maximum torque and starting torque? The solution Given: E- 440 V -0.04 --0.2 Calculate the stator speed; N. - N. - N. - 1O00 rpm Calculate resistance R-0.2x0. s Cakculate the starting torque T.s T - 35.5N-m Caleulate the manimum torque T T T .07 N Question /If the rotor resistance is now doubled by adding an external series resistance, determine: maximum torque ?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 75 kw, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short circuited at the slip rings. Take X1-X2= 0.5 0 /ph ,and assume the stator resistance to be negligible. Find: maximum torque and starting torgue? The solution Given: E- 440 V -0. 04 -0.2 - -0. S ph Calculate the stator speed: N. - N. - 1000 rpm r - 'N Calculate resistance R- S R=0.2 xO.5 R= 0.10 Calculate the starting torque, T. - 35.5N-m Calculate the maximum torque; T T Ta- 13.07 N- m Question /If the rotor resistance is now doubled by adding an external series resistance, determine: maximum torque ?
Transcribed Image Text:A 75 kw, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short circuited at the slip rings. Take X1-X2= 0.5 0 /ph ,and assume the stator resistance to be negligible. Find: maximum torque and starting torgue? The solution Given: E- 440 V -0. 04 -0.2 - -0. S ph Calculate the stator speed: N. - N. - 1000 rpm r - 'N Calculate resistance R- S R=0.2 xO.5 R= 0.10 Calculate the starting torque, T. - 35.5N-m Calculate the maximum torque; T T Ta- 13.07 N- m Question /If the rotor resistance is now doubled by adding an external series resistance, determine: maximum torque ?
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