A 30 hp, 400V, 4pole, 50Hz,Y- connection. 3phase induction motor.Find motor output torque and efficiency at rated slip of 3%, if the total motor impedance per phaseis 12/30°, and rotational losses are 1000W, RI = 0.6/ph?B- State five methods for speed control of three phase induction motors?

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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 110-V, 1-phase, 4-pole, 60-Hz induction motor has the following circuit constants: R1 = R2’ = 1.6 ohm,X1 = X2’ = 1.8 ohm, Xm = 60 ohm; core loss is 16 W and friction and windage loss is 12 W. Determine theefficiency of the motor at 0.04 slip by using (a) the exact equivalent circuit and (b) the approximateequivalent circuit
A four-pole, single-phase, 120 V, 60 Hz induction motor gave the following standstill impedances when tested at rated frequency:Main winding : Zm =1.5+j4 ohmsAuxiliary winding : Za =3+j6 ohmsa) Determine the value of external resistance to be inserted in series with the auxiliary winding to obtain maximum starting torque as a resistor split-phase motor.b) Determine the value of the capacitor to be inserted in series with the auxiliary winding to obtain maximum starting torque as a capacitor-start motor.c) Determine the value of the capacitor to be inserted in series with the auxiliary winding to obtain maximum starting torque per ampere of the starting current as a capacitor-start motor.d) Compare the starting torques and starting currents in parts (a), (b), and (c) expressed as per unit of the starting torque without any external element in the auxiliary circuit, when operated at 120V, 60Hz.
A 6-pole, 230-V, 60-Hz, Y-connected, three-phase induction motor has R1=0.50, R2'=0.250, X1=0.7502, X2'=0.52, Xm=1000, and Rc-50022. The friction and windage loss is 150 W. Determine the efficiency of the motor at its rated slip of 1.5%. Use the original equivalent circuit.
4-25- six pole. Three phase. 40-hp, 60-Hz induction motor has an input when loaded of 35 kw , 51A, 440V And a speed of 1152 rpm ,when uncoupled from the load .the readn are found to be 440-v ,21.3 A ,2.3 Kw , and 1199 rpm,the resistance... Between terminal for the stator winding is 0.25 2 for a Y-connection , the stator core losses and the rotational losse are.determine: a-the power factor b-the horspower
A 6 pole, 230V, 60 H z, Y connected three-phase induction motor has the following parameters on a per-phase basis: R1 = 0.5 , R2 = 0.25 , X1 = 0.75 , X2 = 0.5 , Xm= 100  and RC = 500 . The friction and windage loss is 150 W. Determine the efficiency and the speed of the motor at its rated slip of 2.5%.Assume using exact equivalent circuit.
im curious about #5 but its based on #4!
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Q5 : For a three-phase induction motor , explain briefly the following with mention the necessary relation or graph: 1- Rotor is rotate in the same direction of rotating magnetic field(RMF) . 2- Tx S for s< Sm. 3- Starting torque is increased by deep bar rotor design. 4- The torque will be maximum at slip = R2/X2 . 5- Starting and speed control of wound rotor type.
A 460-V. 25-hp. 60 Hz. four-pole. Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: RI = 0.641 ohm X1 = 1.106 ohm R2 = 0.332 ohm X2 = 0.464 ohm XM= 26.3 ohm (a) What is the maximum torque of this motor? (b) At what speed and slip does it occur? (c) What is the starting torque of this motor? (d) When the rotor resistance is doubled. what is the speed at which the
A wound rotor, induction motor has a rotor resistance of 0.6 ohms per phase and a rotor leakage reactance of 8 ohms.a)What is the operating speed (rpm) of this 2-pole induction motor fed from a 50Hz supply if the slip is 5%?b)If maximum torque occurs when R2 = sX2, what is the slip at maximum torque?c)What resistance must be added to the rotor circuit to give maximum startingtorque?
A three –phase, 440V, 50 Hz, 6 – pole induction motor running at 950 rpm takes 50 kW at certain load. The friction and windage loss is 1.5 kW and the stator losses = 1.2 kW. Determine the output from the rotor. (a). 42.68 kW (b). 46.48 kW (c). 48.80 kW (d). 44. 86 kW
L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no

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A 30 hp, 400V, 4pole, 50Hz,Y- connection. 3phase induction motor. Find motor output torque and efficiency at rated slip of 3%, if the total motor impedance per phase is 12/30°, and rotational losses are 1000W, RI = 0.6/ph? B- State five methods for speed control of three phase induction motors?