2. A 30 induction motor has a starting torque of 1.75 pu and a maximum torque of 2.5 pu when operated from rated voltage and frequency. The full-load torque is considered as I pu of torque. Neglect stator resistance. (a) Determine the slip at maximum torque. (b) Determine the slip at full-load torque. (c) Determine the rotor current at starting in per unit - consider the full-load rotor current as 1 pu. (d) Determine the rotor current at maximum torque in per unit of full- load rotor current.

2. A 30 induction motor has a starting torque of 1.75 pu and a maximum torque of 2.5 pu when operated from rated voltage and frequency. The full-load torque is considered as I pu of torque. Neglect stator resistance. (a) Determine the slip at maximum torque. (b) Determine the slip at full-load torque. (c) Determine the rotor current at starting in per unit - consider the full-load rotor current as 1 pu. (d) Determine the rotor current at maximum torque in per unit of full- load rotor current.

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 three-phase, 460 V, 98hp 1,60 Hz, four-pole induction machine delivers rated output power at a slip of 0.05. Determine: (i) The synchonous speed. (V) speed at half Load (ii) The motor speed. (iii) The rotor frequency. (iv) The slip speed. ...A... -
12. The IR-compensation in frequency control of induction motors is used for: a) compensation of the voltage drop in the active resistance of the stator winding. b) compensation of the voltage drop in the inductive reactance of the stator winding. c) keeping the motor voltage constant. d) keeping the motor speed constant U₁ U₁ Us0 0 f. f₁
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