A 220 V, 50 Hz, 4-Pole, 1410 rpm, single phaseinduction motor has the following parameters: R₁ = 9.5Q, X₁ = 12 Q, R₂ = 10.8 Q, X2 = 12 2, and XM = 260Q. At rated speed the core loss is 30W, and the frictionand windage loss is 15W. The motor is connected to asingle phase 220V, 50 Hz and runs at the rated speed.Determine: the slip, motor current, power factor, inputpower, developed torque, output shaft power, shafttorque, efficiency, rotor frequencies, rotor copperlosses, and the ratio of forward flux to the backwardflux.

Step 1: Step 2: Step 3: Step 4:

Answered: A 220 V, 50 Hz, 4-Pole, 1410 rpm,…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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3.An induction motor has a rotor resistance and reactance at standstill of 0.1 ohm and 3.5 ohm respectively. At standstill the voltage induced to the rotor is 60volts per phase. If the slip is 5%, determine the rotor current
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
(Qld) A three-phase 20-pole induction motor is rated at 800 V, 50 Hz. What is the synchronous speed of this machine if the voltage at its terminals is reduced to 400 V (a) 150 rpm, (b) 300 rpm, (c) 600 rpm, (d) 3000 rpm
A value of magnetizing current in a 3-phase induction motor * gives power factor smaller .. larger smaller. .poor large . better O large...poor O
6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the above
Q3 A 50 Hz split-phase induction motor has a resistance of 50 and an inductive reactance of 200 in the main winding as well as starting winding. Determine the value of resistance and capacitance to be added in series with the starting winding to send the same current in each winding with a phase difference of 90°. Ans[ 14.99 Ω, 127.5μF]
Name three factors that determine the torque produced by an induction motor.
Differentiate between the AC and DC magnetic fields applied to an induction motor stator.
The name plate of single phase induction motor has following data output 373W,230V, frequency 50Hz. Input current 2.9A and power factor is 0.71. Speed 1420 rpm What is efficiency of motor.
A three-phase, 3.3 kV, 50 Hz power supply is used to drive an induction motor. The motor has an eight-pole, star-connected stator. The rotor is also star-connected, with the line ends brought out to sliprings for starting and speed control. At standstill, the open circuit voltage induced on the rotor, as measured between the sliprings, is 1475 V. At the full load speed, the frequency of the induced emf on the rotor winding is 2.5 Hz. The motor has the following parameters: Rc = 250 Q R₁ = 0.1Q Xm=250 X₁ = 0.35 Q R2 = 0.04X2 = 0.30 By referring the rotor quantities to the stator, calculate the following: (i) The shaft output power and torque of the fully loaded motor, if the corresponding friction and windage losses are 44 kW;
T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the above
A three-phase, four-pole, 208 V, 60 Hz, Y-connected, induction motor has the following parameters, in Q/phase referred to the stator: R1 = 0.22, X1 = 0.43, Xm = 15, Rc = 0, R2 = 0.127 and X2 = 0.43. Assume that PFgw = 300 W. For a rated slip of 5%: a) Determine the rms value of the input current of the machine. b) Find the power converted from electrical to mechanical. c) Compute the shaft speed at half-rated load.

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