4. A 65 kW 3-phase, 4-pole, 50 Hz induction motor with 80% full efficiency. In full load condition, the iron loss is double of rotor copper loss. The stator copper loss equals to the mechanical loss which is 1/8 of the rotor copper loss. The rotor current is 165 A/phase. During full load operation, determine: (a) the rotor copper loss, (b) the stator copper loss, (c) the power transferred from stator to rotor, ir

4. A 65 kW 3-phase, 4-pole, 50 Hz induction motor with 80% full efficiency. In full load condition, the iron loss is double of rotor copper loss. The stator copper loss equals to the mechanical loss which is 1/8 of the rotor copper loss. The rotor current is 165 A/phase. During full load operation, determine: (a) the rotor copper loss, (b) the stator copper loss, (c) the power transferred from stator to rotor, ir

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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5- The rotor voltage per phase of a slip-ring star connected induction motor is 289.5 V. The rotor resistance and standstill leakage reactance are 50 and 8 ohm per phase respectively. Determine. (i) the rotor current and power factor at start with slip-rings shorted (ii) the rotor current and power factor at 4% slip with slip-rings shorted (iii) the external rotor resistance per phase required to obtain a starting current of 20 A in the rotor lines.
Q22/ A three phase induction motor with supply frequency of 50 Hz , 10 poles. If the slip is 4 % at a certain load, determine (a) the synchronous speed, (b) the speed of the rotor (c) the frequency of the induced e.m.f in the rotor and speed of the induction motor if the slip changes to 5.75 %
Q2 Complete the answer : The rotor reactance of the three phase induction motor is varies with ................... of the rotor current.
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... -
A four-pole, three-phase induction motor drives a turbine load. At a certain operatingpoint the machine has 4 percent slip and 87 percent efficiency. The motor drives aturbine with torque–speed characteristic given by TL = 20 + 0.006ω2,where TL is theload torque at the shaft. Determine:(1) the torque at the motor-turbine shaft.(2) the total power delivered to the turbine.(3) the total power consumed by the motor.
A 30 kW, 460 V, 1180 rpm, 3 -phase, 60 Hz, Y-connected induction motor has a full-load efficiency of 93.6% and a power factor of 0.83 lagging. The resistance of the stator winding per phase is 0.14 N/phase. Determine: (a) The full-load active power drawn by the motor (b) The full-load line current (c) The full-load rotor winding losses (d) The rotational losses
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Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...
B3. A three-phase, 60 Hz 4-pole induction motor has a slip of 0.05 when the output is 30 kW. The frictional loss at shaft is 300 W. Calculate the following: (i) the rotor speed in r.p.m. (ii) the torque delivered by the rotor. (iii) the torque delivered to the rotor. (iv) the rotor IR loss.