Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 44, Problem 4SQ
To determine
Find the series resistance required to limit the current to 30 A across a
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The circuit shown in the figure below is at steady state before the switch closes at time t=0s. Determine an expression for the capacitor voltage V for t≥0s.
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Q1. A 450 V, 50 Hz, 1450 r.p.m., 25 kW, star-connected three-phase induction motor delivers
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voltage to maintain constant air-gap flux. Calculate the motor current, power factor and
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Electric Motor Control
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- Q2: Determine the suitable auto-transformation ratio for starting a 3-phase induction motor with line current not exceeding three times the full-load current. The short-circuit current is 5 times the full-load current and full-load slip is 5%. Estimate also the starting torque in terms of the full-load torque.arrow_forward(a) Explain the required tests to construct the circle diagram of the induction motor. The stator leakage impedance of a star connected induction motor is (0.5+j1.4) § per phase, and the rotor leakage impedance referred to stator is (0.6+j1.5) 2 per phase. Neglect the magnitizing current, estimate the line current and torque if the machine runs with a slip of 5 percent when connected to a 400V three phase supply (i) normal operation, and (ii) with one line open.arrow_forwardQ2. Enumerate the stages in derivation from first principles of the voltage equation for unbalanced operation of three phase induction motor. Find the efficiency of an induction motor at full load. The machine details are given in the following: 2000hp, 2300V, 3-phase star connected, 60Hz, 4-pole, full load slip R, 0.022, R, 0.1202, Re-451.29, X=500, X, X,=0.320, = 0.03746, When the speed is 1400rpm, using the synchronous reference frames model and rotating reference model. [17M]arrow_forward
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