Question 1A 3-phase, 440-V, delta-connected, 4-pole 50-Hz induction motor runs at a speed of 1447rpm when operating at its rated load. The equivalent circuit has the following per-phaseparametersr1=0.2 Q,x1=x2'=2 0, r2'=0.4 0, rc=200 n, xo = 400Using the approximate circuit, determine, for rated load, the values of line current and powerfactor, torque, output power and efficiency. The mechanical loss is 1000 watts.

Line voltage of the machine (VL) = 440V Since, the machine is delta connected, its phase volage…

A 3-phase, 440-V, delta-connected, 4-pole 50-Hz induction motor runs at a speed of 1447 rpm when operating at its rated load. The equivalent circuit has the following per-phase parameters r1=0.2 0, x1=x2'=2 0, r2'=0.4 0, rc=200 n, xộ = 40 2 Using the approximate circuit, determine, for rated load, the values of line current and power factor, torque, output power and efficiency. The mechanical loss is 1000 watts.

A 3-phase, 440-V, delta-connected, 4-pole 50-Hz induction motor runs at a speed of 1447 rpm when operating at its rated load. The equivalent circuit has the following per-phase parameters r1=0.2 0, x1=x2'=2 0, r2'=0.4 0, rc=200 n, xộ = 40 2 Using the approximate circuit, determine, for rated load, the values of line current and power factor, torque, output power and efficiency. The mechanical loss is 1000 watts.

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...

See similar textbooks

Similar questions

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?
Evaluate the suitability for using as a belt conveyor drive of a three‐phase, wound rotor induction motor by estimating the motor breakdown and start‐up torque. The motor particulars as per manufacturer’s specifications are: 380‐V, 6‐pole, star connected, 50‐Hz. Machine’s parameters on per‐phase basis, referred to the stator are:R1 = 0.12 Ω, R2 = 0.0.3 Ω, X1 = 0.6 Ω, X2 = 0.15 Ω, XM = 42.2 Ω, Rc is neglected
Three-phase induction motor, 460 V 50 Hz, 4 poles, 50 hp with Delta, operating at 3.8% slip rated torque when receives Line Voltage 460 V, 50 Hz The parameters of the equivalent circuit per phase are as follows.R1 = 0.33, X1 = X2 = 0.42 and Xm = 30 Ohm / phase.Answer the following questions by neglecting the mechanical losses, Core losses and Stray load losses.A) Value of the rotor resistance R2 B) Maximum torque and rated speed C) line current and starting torque of motor
Draw the circle diagram for a 5.6 kW, 400-V, 3-φ, 4-pole, 50-Hz, slip-ring induction motor from the following data : No-load readings : 400 V, 6 A, cos φ0 = 0.087 : Short-circuit test : 100 V, 12 A, 720 W. The ratio of primary to secondary turns = 2.62, stator resistance per phase is 0.67 Ω and of the rotor is 0.185 Ω. Calculate (i) full-load current (ii) full-load slip (iii) full-load power factor (iv) maximum torque full - load torque (v) maximum power.
A 3-phase induction motor, 440-V, 50-Hz, 6-pole, delta-connected has the following equivalent-circuit parameters at normal frequency:R1.2 ohm, R'2=0.18 ohm, X1= x'2=0.58 ohm, all per phase values. The machine is subjected in service to an occasional fall of 40% in both voltage and frequency. What total mechanical load torque is it safe to drive so that the machine just does not stall under these conditions? When operating at normal voltage and frequency, calculate the speed when delivering this torque and the power developed. Calculate also the speed at which maximum torque occurs. If V and f were both halved, what would be the increase in starting torque from the normal direct-on-line start at rated voltage and frequency? If now the machine is run up to speed from a variable-voltage, variable-frequency supply, calculate the required terminal voltage and frequency to give the 'safe' torque calculated above: (i) at starting, (ii) at 500 rev/min. Repeat (d) for the machine to develop a…
Three-phase 460-hp, 415 V, 4-pole, 50 Hz induction motor is operating at overvoltage of 480 V and reduced load of 80% of the rated value and draws a line current of 624.06A. The losses at these operating conditions are as follows: The stator conductor loss is 12.6kW, the rotor conductor loss is 10.4kW, the core loss is 11.00kW; and rotational losses is 4.129 kW. Sketch the power flow diagram, enter the known values, and determine (a) rotor speed (b) shaft output torque (c) developed mechanical torque in Nm. (d) input power to the stator; (f) the input power factor. Do only part (a), (b) & (c)
A 400V, 50Hz, four-pole, induction motor connected in star, hasthese parameters in ohms: RI= 0,62, R2 = 0.33, X1 = 0.94, X2 = 1.42,and Xm = 30. The speed of the indaction motor is controlled throughthe changing of the stator voltage and frequency whilst maintaininga constant ratio of V/Hz at rated condition. Assuming the rotorparameters are referred to the stator and for a stator frequency of30Hz, determine:(i)The slip at maximum torque(ii) The speed at maximum torque(ili) The maximum torque
A 25 HP, 6 pole, 50 Hz, 3-phase slip ring induction motor runs at 960revolutions per minute on full load with a rotor current per phase of 35 A.Allowing 250 W for the copper loss in the short-circuiting gear, and 1000Wfor mechanical losses, find the resistance per phase of the three-phaserotor winding.
Q2. For a 10 kW, 380V, three-phase, four-pole, 1200 r/min, delta-connected induction motor. Adopt a specific magnetic loading of 0.4712 Wb/m2 and a specific electric loading of 23000 ampere-conductors per metre. The motor has a full-load efficiency of 85% and a full-load power factor of 0.8. A square pole design may be assumed and the stator leakage impedance voltage drop may be ignored. Assume also that the winding is full-pitched and uniformly wound. To calculate the following design parameters (a) The approximate outer diameter and length of the rotor core (b) the air gap length of the motor (c) the turns per phase (d) the number of conductors per slot, if 3 slots per pole per phase are chosen
The armature of a 400V, 6-pole, 25 Hz single-phase series motor is lap-wounded with 504 conductors Motor field winding has effective resistance and leakage reactionance are 0.06 22 and 0.05 12, respectively and has 18 turns. However, the armature winding has a leakage reactance of 0.04 12 and negligible resistance. At rated motor current of 300A, the flux per pole is 0.05 Wb, the short circuit current is 50A and the equivalent current to iron losses is 40A. Find motor speed , torque and efficiency at rated current .
Please Do not Designed 15 Kw Please Must Show Given Questions in Design for 11KW Motor . A15 kW, 440 V, 4-pole, 50 Hz, 3-phase induction motor is built with a stator bore 0.25 m and a core length of 0.16. The specific electric loading is 23000 ampere conductors/meter. Using the data of this machine, determine the core dimensions, number of stator slots and number of stator conductors for 11 kW, 460 V, 6 pole, 50 Hz motor. Assume a full-load efficiency of 84% and power factor of 0.82 for each machine.the Winding Factor is 0.955.
Please show a step-by-step solution. The following data were obtained from no-load, blocked-rotor, and DC tests of a three-phase, wye-connected, 40-hp, 60-Hz, 460-V, design B induction motor whose rated current is 57.8 A. The blocked-rotor test as made at 15 Hz. Blocked Rotor No-Load DC Vline = 37.3 V Vline = 460.0 V VDC = 12.0 V Iline = 57.9 A Iline = 32.7 A IDC = 59.0 A P3 phase = 2541.4 P3 phase = 4664.4 WDetermine the rotor resistance referred to the stator side in Ohm per phase. Give your final answer in 4 decimal places. Correct Answer is 0.6550