Q6: A. A 12-pole, 3-phase, star-connected induction motor turns at 660 v, 50 Hz. It has a slip-ring rotorresistance 0.032 and a standstill reactance of 0.52 per phase. Calculate, (i) the speed at maximum torqueand (ii) the ratio of the full-load torque at 495 rpm, to maximum torque(8M)

No. of poles (P) = 12 Supply frequency (f) = 50 Hz Rotor resistance/ph (R2) = 0.03 Ω Rotor…

Q6: A. A 12-pole, 3-phase, star-connected induction motor turns at 660 V, 50 Hz. It has a slip-ring rotor resistance 0.03N and a standstill reactance of 0.52 per phase. Calculate, (i) the speed at maximum torque and (ii) the ratio of the full-load torque at 495 rpm, to maximum torque

Q6: A. A 12-pole, 3-phase, star-connected induction motor turns at 660 V, 50 Hz. It has a slip-ring rotor resistance 0.03N and a standstill reactance of 0.52 per phase. Calculate, (i) the speed at maximum torque and (ii) the ratio of the full-load torque at 495 rpm, to maximum torque

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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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

Q6: A. A 12-pole, 3-phase, star-connected induction motor turns at 660 v, 50 Hz. It has a slip-ring rotor
resistance 0.032 and a standstill reactance of 0.52 per phase. Calculate, (i) the speed at maximum torque
and (ii) the ratio of the full-load torque at 495 rpm, to maximum torque
(8M)

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