A 75kW, 440V, 3-phase, 6-pole,50Hz 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. Assume the stator resistance and rotational losses to be negligible. Find (a) Maximum torque (b) Starting torque (c) Full load copper loss. The rotor resistance is now doubled by adding an external series resistance.Determine (d) Slip at full load (e) full-load torque (f) slip at maximum torque
A 75kW, 440V, 3-phase, 6-pole,50Hz 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. Assume the stator resistance and rotational losses to be negligible. Find (a) Maximum torque (b) Starting torque (c) Full load copper loss. The rotor resistance is now doubled by adding an external series resistance.Determine (d) Slip at full load (e) full-load torque (f) slip at maximum torque
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 75kW, 440V, 3-phase, 6-pole,50Hz 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. Assume the stator resistance and
rotational losses to be negligible. Find
(a) Maximum torque
(b) Starting torque
(c) Full load copper loss.
The rotor resistance is now doubled by adding an external series resistance.Determine
(d) Slip at full load
(e) full-load torque
(f) slip at maximum torque
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