Answer (3) questions, using English language dhlyQT:Use the information qgiven below in the pame plate of a 3 phase wound rotor induction motor lo :(i)(ii)(iii)(iv)(v)Calculate motor starting current and efficiency if Ts/Tr=1.57Discuss why the starting current is very high with respect to the rated current?vwhat's the value of starting current if the motor is started by a star- delta starter ?Explain what's the meaning of ( S1) and( F) in this name plate?Explain with plot how we can increase the starting torque of this motor?Year.1996ТуроMOT 112MNo.042657Hz50Peles4H.PA.P.M1440Ph.3-1ns.Amb. TempCos 8O.85Duty$1Frotection.IP 53v380V.48우우우8,5A

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Answer (3) questions, using English language biny G1. Use the information given below in the pame plate of a 3 phase wound rotor induction motor ic (i) (ii) (iii) (iv) (v) Calculate motor starting current and efficiency if Ts/Tr 1.5? Discuss why the starting current is very high with respect to the rated current? What's the value of starting current if the motor is started by a star- delta starter ? Explain what's the meaning of ( S1) and( F) in this name plate? Explain with plot how we can increase the starting torque of this motor? Type MOT 112M 042657 Year. 1998 No. Peles H.P Hz 50 R.P.M 1440 Ph. 3 Amb. Tamp Cos 8 O. 85 Duty $1 Frotection. IP 53 380 V. A800 8,5

Answer (3) questions, using English language biny G1. Use the information given below in the pame plate of a 3 phase wound rotor induction motor ic (i) (ii) (iii) (iv) (v) Calculate motor starting current and efficiency if Ts/Tr 1.5? Discuss why the starting current is very high with respect to the rated current? What's the value of starting current if the motor is started by a star- delta starter ? Explain what's the meaning of ( S1) and( F) in this name plate? Explain with plot how we can increase the starting torque of this motor? Type MOT 112M 042657 Year. 1998 No. Peles H.P Hz 50 R.P.M 1440 Ph. 3 Amb. Tamp Cos 8 O. 85 Duty $1 Frotection. IP 53 380 V. A800 8,5

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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A 440 V, 50 Hz 9740 rpm 6 Pole star connected, 3 phase wound rotor induction motor has thefollowing parameters referred to as the stator. Rs=0.1-ohm, Rr’= 0.08 ohms, Xs=0.3 ohm, Xr’=0.4 ohms. The stator to rotor turns ratio is 2. Motor speed is controlled by a static Kramer drive.Drive is designed for a speed range of 25% below the synchronous speed. Maximum value offiring angle is 165 degrees. CalculateA.) Transformer turn ratio.B.) Torque for speed of 780 rpm and alpha=140 degrees.C.) Firing angle for half the rated motor torque and speed of 800 rpm.
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Practical Part (Question 1): A three phase, 25-hp, 460-V, 4-pole, 60-Hz, Y-connected wound-rotor induction motor has the following parameters per phase: R1 = 0.641 2 R2 = 0.332 2 X1 = 1.106 2 X2 = 0.464 2 Xm = 26.3 2 For a rotor slip of 16.667 percent at the rated voltage and rated frequency, Full load torque of the motor is 40-N.m. without the starting rheostat (short circuit) Determine the following: (a) Starting torque; Pullout torque; Synchronous Speed; No-load speed; Rated Speed; (b) 1. 2. 3. 4. 5. If the motor drives a load for which tLoad = 25N.m. Determine the following: Slip at this load; Line current; 1. 2. Induced torque of the motor, does tind = tload (Why?) Speed regulation; Efficiency; (c) 3. 4. 5. If the load on the motor increases to 20 N.m. Determine the following: Slip at this load; Line current; Speed regulation; Efficiency; What are the changes happen on the (slip, line current, speed regulation and efficiency of the motor) when the load on the motor increased…
Explain the supply voltage control method to control speed of three phase induction motor. Why this method is rarely used in practice? Draw the speed torque characteristic mentioning the effect of supply voltage on the speed. If you answer me within 20-30 minutes then I will give you the best feedback and definitely an upvote too
b) A 415V, 50HZ, 3-phase induction motor supplies its rated power to a constant load. The rated speed of the motor is 980 rpm. Identify the pole number of the motor and calculate the rate slip () (ii) Draw the circuits for the no-load and block-rotor tests and indicate the slip for each of the tests. (iii) If the supply voltage is changed to 332V and 40HZ, calculate the motor speed, slip frequency, and slip.
A three phase, 50 Hz, 4 pole slip ring induction motor runs at 1455 rpm on full load. The rotor resistance per phase on stand still is 0.2 ohm. It is required to reduce the speed by 10% by inserting the series resistance in the rotor circuit. Determine the rotor resistance per phase required. (Ans: 0.6467 ohm)
7-6. A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 r/min and a full-load speed of 1720 r/min. Calculate the slip and the electrical fre- quency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor [Equation (4-68)]?
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