A 6 pole, 50 Hz, 3-phase, wound rotor induction motor is taking 8000 watts from theline. If core loss is 210 watts, stator copper loss is 520 watts, rotor copper loss is 430watts, friction and windage losses are 90 watts, determine: (a) power transferredacross air gap; (b) mechanical power developed by rotor; (c) mechanical poweroutput; (d) motor efficiency; (e) slip?

Step 1: Given Data: Line power (input power): Pinput=8000W Core loss: Pcore=210W Stator copper…

Answered: A 6 pole, 50 Hz, 3-phase, wound rotor…

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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1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be....... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2. When maximum starting torqua ic ohtoinod
1. 2. 4. 4. •.. .... ..... .... E.g. • 2. A 3 phase, 460 V, 10hp, 60 Hz, four-pole induction machine delivers rated output power at a slip of 0.05. determine the a. Synchronous speed and motor speed b. speed of the rotating air gad field c. frequency of the rotor circuit d. Slip in rpm e. Speed of the rotor field relative to the i. rotor structure ii. Stator structure iii Stator rotating field f. haft torque of this motor at the rated load? ... .... Equivalent Circuit • The induction motor consists of a two magnetically connected systems: Stator and rotor • This is similar to a transformer that also has two magnetically connected systems: primary and secondary windings. • The induction motor is similar to the transformer with the excention that its secondarv windings are free to.
B/ fill in the blanks: The power factor of a squirrel cage induction motor is.... at light load only. 2. The eddy current loss in an AC electric motor is 100 watts at 50 Hz. Its loss at 100 Hz will be... 3- The rotor power output of a 3-phase induction motor is 15 KW and corresponding slip is 4%. The rotor copper loss will be.... 4- The resistance representing mechanical output in the equivalent circuit of an induction motor as seen from the stator is:.....
Q / What is the benefit, purpose and conclusions of making single-phase induction motors ..?
I.What is the effect of load on the efficiency of an induction motor? II. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? III. Derive an expression for the rotor copper loss in terms of slip and input to the rotor? IV. What are the various losses in an induction motor? On what factors do they depend? V. List the different types of stray load losses in an induction motor.
1.5 A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters Winding Resistance................0.19 Ω ......... Winding Reactance.................1.12 Ω.......... Rotor Parameters Winding Resistance......................0.29 Ω Winding Reactance.....................1.12 Ω Magnetising Reactance................................16.8 Ω Equivalent Core‐loss Resistance....................900 Ω. The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine: 1.5.1 The stator current. 1.5.2 Estimate the Output torque of the motor under the rated conditions. 1.5.3 The Motor…
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Q1) Answer the following: - 1- if T=295 NM for 4-pole dc motor having 774 conductors, wave wound ,24mwb flux per pole then la = results in decreasing as shown in 2-Hence, beyond certain limit any further decrease in the consequently, the characteristic curve figure below. B Armature Reaction Drop Ohmic Voltage Drop D Internal Characteristic External Characteristic Load Current (I) 3-in figure below Armature flux lines is due to the Field poles are GNA, MNA Amaturs 4-If the DC shunt generator has an induced open circuit voltage of 127 v and the generator is delivers current of 342 A, the on load voltage is 120 v and field resistance 15 ohm then RaD 5- However, even when the field current is zero, some amount of emf is generated (Represented by fact that there exists some residual magnetism in the field poles. in the figure below) this initially induced emf is due to the N. N. N. Increase in speed (N) Field Current (1,) No-load voltage (E) Generated Voltage (Eg) o Terminal Voltage (V)>…
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. Explain how the pulsating mmf of a single-phase induction motor may be considered equivalent to two oppositely-rotating fields. Develop an expression for the torque of the motor. A 125-W, 4-pole, 110-V, 50-Hz single-phase induction motor has the no-load rotational loss of 25 watts and total rotor copper loss at rated load of 25 watts at a slip of 0.06. At a slip s = 0.06, what is the power input to the machine ?
6- In a stepper motor, how is the speed of rotation determined? a) By the current supplied to the motor. b) By the magnitude of the voltage applied. c) By the load applied to the motor. d) By the frequency of the waveforms used. 7- A transformer core is laminated to a) reduce hysteresis loss b) reduce eddy current losses c) reduce copper losses d) reduce all above losses 8- An induction motor with 580 r.p.m. speed at 60 Hz will have a) 8 poles b) 6 poles c) 4 poles d) 2 poles 9- If any two phases for an induction motor are interchanged a) the motor will run in reverse direction b) the motor will run at reduced speed c) the motor will not run d) the motor will burn 10- No-Load speed of which of the following motor will be highest? a) Shunt motor b) Series motor c) Short-Shunt compound motor d) Long-Shunt compound motor
Q1) Answer the following: - 1- if T=295 NM for 4-pole dc motor having 774 conductors, wave wound ,24mwb flux per pole then la = 2-Hence, beyond certain limit any further decrease in the consequently, the figure below. results in decreasing characteristic curve_ as shown in Armature Reaction Drop Ohmic D Voltage Drop Internal Characteristic External Characteristic Load Current (1) 3-in figure below Armature flux lines is due to the Field poles are GNA MNA Amatu 4-lf the DC shunt generator has an induced open circuit voltage of 127 v and the generator is delivers current of 342 A, the on load voltage is 120 v and field resistance 15 ohm then Ra= 5- However, even when the field current is zero, some amount of emf is generated (Represented by fact that there exists some residual magnetism in the field poles. in the figure below) this initially induced emf is due to the N. N, N. Increase in speed (N) Field Current (1,) 6- The connection arrangement to obtain shunt or series excited…

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