The following test data were taken on a 7.5-hp, four-pole, 208-V, 60-Hz, designA, Y-connected induction motor having a rated current of 28 A.DC test:Vdc = 13.6 V, Idc= 28.0ANo-load test:VT = 208V, IA = 8.12A , IB = 8.20A , IC = 8.18A , f= 60 Hz , Pin= 420WLocked-rotor test:VT = 25 V, IA = 28.IA, IB = 28.0A , Ic = 27.6A ,f= 15 Hz , Pin = 920W(a) Sketch the per-phase equivalent circuit for this motor.(b) Find the slip at the pullout torque, and find the value of the pullout torqueitself.%3D

It is given that: Pr=7.5 hpPoles=P=4 V=208 Vf=60 Hz

Answered: The following test data were taken on a…

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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This questions is about Electrical machines , and I need the answer in 30 minutes please
A 3 phase , 6 pole , 400 V , 50 Hz , induction motor has R2= 0.1 ohm /ph , X2= 0.8 ohm /ph and the induced emf between slip rings at standstill is 160 V , Assume the friction losses is 300 W. find :- a) the torque output at slip =3% . b) critical slip and the torque maximum .
A 400 V, 3-phase, 4 pole slip ring induction motor is supplied at rated voltage and frequency. The actual rotor resistance per phase is 3 2 and the stand still rotor reactance per phase is 12 2. Neglect stator resistance, reactance and magnetizing reactance. 1. Determine the value of resistance to be added to the rotor circuit to get the maximum torque at starting. 2. Determine the value of resistance to be added to the rotor circuit to get 75% of the maximum torque at starting.
When the speed of the dc motor is varied by changing the armature resistance, is to be held constant. O field flux O applied voltage O load current O armature current The starting torque of a three phase slip ring induction motor is to a three phase squirrel cage induction motor. when compared O very low O low same O high
1. The rotor resistance and reactance per phase of a three-phase wound rotor induction motor are 0.035 and 0.15 ohm respectively. If an additional resistance is added, the starting torque is one half of maximum torque and the full load torque is three-fourth of the maximum. Determine the following: a. Full load speed b. speed at maximum torque c. value of additional resistance per required to achieve these conditions.
7-5. A 50-kW, 440-V, 50-Hz, six-pole induction motor has a slip of 6 percent when op- erating at full-load conditions. At full-load conditions, the friction and windage losses are 300 W, and the core losses are 600 W. Find the following values for full- load conditions: (a) The shaft speed n. (b) The output power in watts (c) The load torque Tloud in newton-meters (d) The induced torque Tiad in newton-meters (e) The rotor frequency in hertz
B. The name-plate of a squirrel-cage induction motor has the following information: Rated power: 50 hp; rated voltage: 400 V; rated frequency: 50 Hz; rated speed: 1480 rpm. When the machine is run on no-load at rated voltage, it draws a stator current of 13.5 A at a power factor of 0.16 lagging. The stator winding resistance is 0.1 , the rotor winding resistance is 0.05 , the stator leakage inductance is 2 mH and the rotor leakage inductance is 2 mH. i. What is the synchronous speed of this machine? Calculate the no-load losses of the machine. ii. iii. Calculate the magnetizing inductance of this machine. iv. Calculate the stator current and its power factor when the machine runs at rated speed. Neglect the core-loss resistance in your calculation. V. vi. Calculate the rotor current and its power factor when the machine runs at rated speed. Calculate the developed torque when the machine runs at rated speed. Calculate the efficiency of the machine when it runs at rated speed. vii.
ILIO An 8-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0.025 phase and a rotor standstill reactance of 0.12/phase. At what speed is the torque maximum? What proportion of Ans[675 r.p.m; 1.45] ɔnbioi peoI-unI maximum torque is the starting torque? Ans[562.5 r.p.m; 0.47] 16 2.
A 3-phase, 220-V, 50-Hz, 6-pole, Y-connected induction motor is operating with a per-unit slip of 0.07, 95 A line current, PF=0.8 lagging, and 2200 W stator copper losses. The total friction, windage, and core losses are lumped and assumed to be constant at 3.5 KW. Find the rotor copper losses and the output power of this motor? Select one: O a. None O b. PRCI = 1.08 KW and Pout = 18.8 KW O c. PRCL = 1.87 KW and Pout = 21.4 KW O d. PRCL = 10.5 KW and Pout = 29.14 KW
The equivalent circuit parameters of a 230-V, 1-phase, 6-pole, 60-Hz induction motor are: R1 = R2’ =10ohm, X1 = X2’ = 10ohm, and Xm = 100ohm. At a slip of 5%, calculate the developed torque and The input power to the motor at 230V, while running on no-load, is 31.4 W at 1.2 A. What is the approximate efficiency of the motor at 5% slip?

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