Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 58, Problem 11SQ
To determine
Mention an electronic device which is connected between a load and line when control output device is rated at AC voltage of 120 volts.
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Q2:
A 208V, Y-connected synchronous motor is drawing 40A at unity power factor from a 208V power
system. The field current flowing under these conditions is 2.7A. Its synchronous reactance is 0.82 and its
armature resistance is 0.2 2. Assume a linear open-circuit characteristic.
1- Find EA and the torque angle.
2- How much field current would be required to make the motor operate at 0.8 PF lagging.
3- How much field current would be required to make the motor operate at 0.8 PF leading.
4- How much field current would be required to make the motor operate at unity PF.
6) For each case find the answer:
2
(a) If q (t) = 2+ + 6 + + 3 Coulombs
Find i(t) at t = 4 seconds
(b) If i(t) = 4 Amperes
If
Find q (t) for 25 = ≤6 seconds
(c) If w(t) = 5t³ Joules
Find p(t) at t = 3 seconds
(d) If p(t
2t+3+4 Watts
Find w(t) for 1st≤5 seconds
As we will learn in Chapter 8, to maximize the transfer of power from an input circuit to a load ZL, it is necessary to choose ZL such that it is equal to the complex conjugate of the impedance of the input circuit. For the circuit in Fig. P7.50, such a condition translates into requiring ZL = Zth*. Determine ZL such that it satisfies this condition.
Chapter 58 Solutions
Electric Motor Control
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