Below are the single-phase equivalent circuit parameters of a 3-phase Star connected asynchronous motor. Total mechanical and friction losses will be neglected. Rated power 4kW Rated voltage 380 Vrms line (220Vms phase-neutral voltage) Rated frequency50Hz Number of poles 4 = 1.5 Q, Xi= 1.5jQ n= 0.550, x2= 1.25JQ Xm=14jQ This motor slippage is measured at 3% (s = 0.03) when loaded with a load below the rated point. (Voltage and frequency at rated value). For this operating condition, the rotor speed (or), the moment to be obtained from the shaft (Tm), the stator and rotor currents, (I1 and 12), the magnetizing current (Im), the input power to be drawn by the motor (PIN), the reactive power (QIN), the shaft. Find the output power (Pm), motor efficiency (n), stator and rotor losses and power factor (cosF) for the exact equivalent circuit. rpm TR Nm I = Arms I2 = Arms Im = Arms PN= QN= Pm= VAr % Stator losses W %3! Rotor losses W Power factor %3! I|||

Below are the single-phase equivalent circuit parameters of a 3-phase Star connected asynchronous motor. Total mechanical and friction losses will be neglected. Rated power 4kW Rated voltage 380 Vrms line (220Vms phase-neutral voltage) Rated frequency50Hz Number of poles 4 = 1.5 Q, Xi= 1.5jQ n= 0.550, x2= 1.25JQ Xm=14jQ This motor slippage is measured at 3% (s = 0.03) when loaded with a load below the rated point. (Voltage and frequency at rated value). For this operating condition, the rotor speed (or), the moment to be obtained from the shaft (Tm), the stator and rotor currents, (I1 and 12), the magnetizing current (Im), the input power to be drawn by the motor (PIN), the reactive power (QIN), the shaft. Find the output power (Pm), motor efficiency (n), stator and rotor losses and power factor (cosF) for the exact equivalent circuit. rpm TR Nm I = Arms I2 = Arms Im = Arms PN= QN= Pm= VAr % Stator losses W %3! Rotor losses W Power factor %3! I|||

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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b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R1= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) n and 2 = 20L0°. Use exact equivalent circuit to determine the following at rated slip of 0.03: I. Stator current I. Magnetizing current II. Power factor IV. Developed torque
The suitability of oscilloscopes for voltage measurement and DC display.
5- The rotor voltage per phase of a slip-ring star connected induction motor is 289.5 V. The rotor resistance and standstill leakage reactance are 50 and 8 ohm per phase respectively. Determine. (i) the rotor current and power factor at start with slip-rings shorted (ii) the rotor current and power factor at 4% slip with slip-rings shorted (iii) the external rotor resistance per phase required to obtain a starting current of 20 A in the rotor lines.
P2:= A 4-pde,250V series motor has a wave Connectedl anmature with 1254 Gnductors. The Flux per pole is 22 m wb when the motar is taking 50A. Iren and fridion losses amount to Lkw. Amature resistanceis 0.202 and series field resistance is o.202 Calculate - (() the speed () the shaff torque the efficiengy (ii l
A 240-V, star connected, three phase, synchronous motor has a synchronous reactance of 4-ohm/phase and negligible armature winding reactance. At a certain load the motor takes 7.20-kW at 0.866 pf lag. Determine: (1)The phase voltage (Va): M (ii) The per-phase complex current (la -deg [A] (iii) The per-phase complex induced excitation voltage (Ea -deg [V] If the power developed by the motor remains the same while the excitation voltage is decreased by 10-% by dropping the field excitation, determine: (iv)The new complex induced excitation voltage (Ea -deg [V] (v)The new per-phase complex current (la [A] (vi) The new power factor (pf@ lag/lead): -deg . Please all subparts in short like it definitely don't reject in shorts please i will dislike for first three subparts.
P-1). All dual-voltage single-phase split-phase motors have two sets of start windings. a) true b) false P-2). Which of the single-phase split-phase motors listed below is designed to have its start winding energized while running. a) resistance-start induction-run b) capacitor-start induction -run c) capacitor-start capacitor-run d) all of the above P-3).Which of the capacitors listed below has the longer duty cycle because it can dissip eat better? a) electrolytic b) oil
A 460 V, 60 Hz, Star connected, 870 r.p.m., Eight poles, Three-Phase Induction Motor has the following per phase parameters: R1 = 0.07, R2 = 0.05, X1 = X2 = 0.2, Xm = 6.5, Draw the approximate equivalent circuit and determine the following:I. Starting TorqueII. Maximum TorqueIII. Rated TorqueIV. Stator CurrentV. Power FactorVI. Input PowerVII. Magnetizing Current
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