Bhu INDUCTION MACHINESPROBLEMSP1Determine the number of poles, the slip, and the frequency of the rotor currentsat the rated load for three-phase induction motors rated at:(a) 2200 V, 60 Hz, 588 rpm.(b) 120 V, 600 Hz, 873 rpm.P2.The full-load speed of a 25 Hz induction motor is 720 rpm, while its no-load speedis 745 rpm. Find the slip at full load.P3.A 50 hp, three-phase, 60 Hz, wye-connected induction motor operates at a shaftspeed of almost 900 rpm at no load and 873 rpm at full load. Determine thefollowing:(a) The number of poles of the motor(b) The per-unit and percent slip at full load(c) The slip frequency of the motor(d) The speed of the rotor field with respect to the rotor itself(e) The speed of the rotor field with respect to the stator(f) The speed of the rotor field with respect to the stator field(g) The shaft torque of the motor at full loadP4.The following data is read on the name plate of a three-phase cage induction motor:output power Pout = 3 kW, input frequency f = 50 Hz, speed n = 2800 rpm, voltageV₁ = 380 V (line-to-line), efficiency n = 80%, power factor cosp = 0.92. If thestator windings are Y-connected, find:1) the number of poles 2p, and the slip s,2) the input current Is, and input power Pin.3) the mechanical power Pm and electromagnetic power Pem. given rotationallosses Prot 120 W,4) the shaft torque T and the electromagnetic torque Tem.P5.A three-phase, 480 V, 25 hp, two-pole 60 Hz induction motor has a full-load slipof 5%. Determine the following:(a) The synchronous speed of the motor(b) The rotor speed at full load.(c) The slip frequency at full load

Note: As per our company guidelines we are supposed to answer only one question. Kindly repost other…

P1. Determine the number of poles, the slip, and the frequency of the rotor currents at the rated load for three-phase induction motors rated at: (a) 2200 V, 60 Hz, 588 rpm. (b) 120 V, 600 Hz, 873 rpm.

P1. Determine the number of poles, the slip, and the frequency of the rotor currents at the rated load for three-phase induction motors rated at: (a) 2200 V, 60 Hz, 588 rpm. (b) 120 V, 600 Hz, 873 rpm.

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

A three-phase induction motor, operating at rated voltage and frequency, has a startingtorque of 1.35 times and a maximum torque of 2.2 times, both with respect to its rated-loadtorque. Ignoring the effects of the stator resistance and rotational losses and assumingconstant rotor resistance, determine the slip rated load, and the rotor current at starting (as a percentage of the rotor current at rated load). The slip at maximum torque is 0.343 if that helps.
A three-phase induction motor, operating at rated voltage and frequency, has a startingtorque of 1.35 times and a maximum torque of 2.2 times, both with respect to its rated-loadtorque. Ignoring the effects of the stator resistance and rotational losses and assumingconstant rotor resistance, determine the slip at the maximum torque;
1. What is the formula for torque production in a single-phase induction motor? Draw a vector diagram for capacitor start single-phase induction motor.2. Which type of starter is popular for using in induction motor and why?
A 80 kW, 480-V, 60-Hz, six pole induction motor has a slip of 5 percent when operating at fullload conditions. At full-load conditions, the friction and windage losses are 300 W, and the core losses are 400 W. For full-load conditions, compute the induced torque,T-ind, in N-m.
A three-phase 60 Hz induction motor connected to a three-phase bus at rated voltage isoperating at a low slip condition (i.e s < 20%) resulting in a steady state speed of 1090 rpm.(a) How many poles does the motor have?(b) What is the percentage slip at the operating speed?(c) What is the corresponding frequency, (fr) of the currents and voltages induced in therotor winding?
A three phase, 50Hz, 6-pole squirrel cage induction motor runs at 960-rpm on full load. The stand still rotor resistance and reactance per phase are 0.01 ohm and 0.05 ohm respectively. Express the maximum torque developed in terms of full load toque. Find the slip at which the maximum torque occurs.
The rotor resistance and reactance per phase of a 4-pole, 50-Hz, 3-phase induction motor are 0.025 ohm and 0.12 ohm respectively. Make simplifying assumptions, state them and : (i) find speed at maximum torque (ii) find value of additional rotor resistance per phase required to give three-fourth of maximum torque at starting. Draw the equivalent circuit of a single-phase induction motor.
A feed industry, where a cereal crusher is coupled to a three-phase induction electric motor with a squirrel cage rotor with a power of 25 hp, driven by a star-delta starter, has a starting current of 6 .in.Considering that this motor has 2 poles and a nominal current of 60.8 A for operation in duty mode with a voltage of 220 V at 60 Hz and that the starting time is 20 s with the star-delta switch: a) Determine, for the configuration with the star-delta switch, what is the maximum starting current (peak current) for this motor. b) Define when the current peak occurs in the star-delta switch and the reason for this effect. PLEASE make it in a computer-typeable written form, written
A 50-kW, 440-V, 50-Hz, six-pole induction motor has a slip of 6 percent when operating at full-load conditions. At full-load conditions, the friction and windage losses are 300 W, and the core losses are 600 W. Find the following values for full-load conditions: (a) The shaft speed nm (b) The output power in watts (c) The load torque load in newton-meters (d) The induced torque ind in newton-meters (e) The rotor frequency in hertz
For a three-phase induction motor connected in star (Y) configuration and operating on a frequency f Hz network with a phase voltage V1 V, slip s, and power factor cosϕ, we have approximate relationships that are valid near the nominal operating point for the phase current I1 A, and for the electromagnetic torque T Nm in relation to the mechanical speed nmech rpm. The torque is given by T=−4.667⋅nmech+7000 and the phase current by I1=−nmech+1500. The motor's total losses are Pα,mech W. The core losses and distributed losses are neglected. Given f=50 Hz, V1=380 V, s=0.035,cosϕ=0.97, and mechanical losses Pα,mech=550.Find me the angular velocity
A 6-pole, 60-Hz, Y-connected, three-phase induction motor develops a torque (Td) of 250 N.m at a speed of 720 rpm. The rotor resistance is 0.4 Ohm/phase, and the stator winding impedance is negligible. A) What is the air-gap power? B) What is the rotor current refered to the stator? C) If the rotational loss is 1kW, what is the motor output power in hp?
Q/ A 3-phase squirrel-cage induction motor, at rated voltage and frequency, has a maximum torque of 225 percent and starting torque of 150 percent of full-load torque. Neglect stator resistance and rotational losses and assume costant rotor resistance. Calculate:i) the slip at maximum torque.ii) the slip at full load.