A 460 V, 25 hp, 60 Hz, four pole, Y-connected induction motorhas the following impedances:R1 0.641 2X1 = 1.106 ΩX2 = 0.464 ΩMechanical loss is 100 W and core loss is 1 kW for a slip2.2%, find:(a) The speed.(b) The stator current.(c) Power factorR2 = 0.332 QXm 26.30(d) The developed and output power(e) The developed and output torque(f) Efficiency

Given data Supply voltage, V1=460 V Power rating, Prating=25 hp Number of pole, P=4 R1=0.641 Ω,…

A 460 V, 25 hp, 60 Hz, four pole, Y-connected induction motor has the following impedances: R1 0.641 2 Ω = R2 0.332 Q 02 (a) The speed. (b) The stator current. (c) Power factor = X1 = 1.106 Ω Χ2 = 0.464 Ω Xm 26.3 Q Ω Mechanical loss is 100 W and core loss is 1 kW for a slip = 2.2%, find: = (d) The developed and output power (e) The developed and output torque (f) Efficiency

A 460 V, 25 hp, 60 Hz, four pole, Y-connected induction motor has the following impedances: R1 0.641 2 Ω = R2 0.332 Q 02 (a) The speed. (b) The stator current. (c) Power factor = X1 = 1.106 Ω Χ2 = 0.464 Ω Xm 26.3 Q Ω Mechanical loss is 100 W and core loss is 1 kW for a slip = 2.2%, find: = (d) The developed and output power (e) The developed and output torque (f) Efficiency

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

See similar textbooks

Similar questions

What will be the operating power factor of a 3-phase induction motor, whose ratings are 230 V, 50 Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency of 92% and draws a line current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W respectively. (a) 0.85 (c) 0.93 (b) 0.90 (d) 0.80
A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?
8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 W
1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
6. Home Works: a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 jo.22 Q j0.22 0 j6.28 NE E1 0.05 0
2. A 30, 60 Hz, 6 pole, wye-connected induction motor is rated at 600 hp (1 hp = 746 W) and 800 V. The parameters of the equivalent circuit are R1 = 0.08 2 X1 = 0.15 N Xm = 16 2 R2 = 0.04 2 X2 = 0.08 N The friction and windage losses are 0.6 kW. You may ignore the core losses for this problem. For a slip of 3%, determine the following, assuming the line-neutral terminal voltage angle ZVị is zero: (a) Line current and power factor (b) Air-gap power (c) Power converted from electrical to mechanical form
The rotor of a 3-phase, 60 Hz, 4-pole induction motor takes 118 kW at 3Hz. The motor has stator copped loss of 2.95 kW, a mechanical loss of 2kW and a stator core loss of 1.7 kW. Solve for the motor efficiency
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
A four-pole induction motor drives a load at 2575 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. ▾ Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit ▾ Part B Value μÀ Submit I= Value Provide Feedback ^ Request Answer If the dc-to-ac converter has a power efficiency of 85 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. 4 Ò Request Answer Units ? Units ?
Please solve 209V, three-phase, Six poles, Y-connected induction motor has the following parameter: R1=0.128 Ohm, R'2=0.0935 Ohm, Xeq=0.49 Ohm. the motor slip at full load is 2% and for a Fan-Type load, Calculate following below : I have the Final answers and I do need to step by step which the formula and solution. Please if you use handwriting to write clearly and big. Thanks, The final and correct answers are: Problem3 (Reducing supply voltage) a) motor speed: 1163.3 rpm, b) starting torque= 71.93 Nm, c)starting current=179.5A, efficiency= 93.04%
the field windings of a series motor has a resistance of 120 ohms at 15° c. after running for 2 hours, the resistance has increases to 140 ohms. if the temperature coefficient of the windings at 0°C is 0.004, find the new temperature of the windings
Q5)A- A 3-phase Induction motor has an efficiency of 0.91 when it delivers an Output power of 22KW. At this load,the stator copper losses equals the rotor copper losses and the total copper losses equals the no- load losses the mechanical losses are one-fourth the no-load losses Find the slip write equations with drawing power flow Diagram ? B-Define the following: (i)Regulation (ii) Slip (iii)Core and shell Transformer (iv)PM motor