EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Question
Chapter 19, Problem 1SQ
To determine
Explain why the selector switch and a two-wire pilot device should be connected to the magnetic starter to control a large motor and they cannot be controlled directly.
Expert Solution & Answer

Explanation of Solution
If the contacts of the selector switch and automatic pilot device are large enough to pass the safety full-load current of motor, then they can control the motor directly, but the contact capacity of these devices is generally not large enough for huge motors.
Hence, these devices cannot be utilized to control the motor directly.
These two devices are connected to magnetic starter for controlling a large motor.
Conclusion:
Thus, the given statement is explained.
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I need help in creating a matlab code to find the currents USING MARTIXS AND INVERSE to find the current
Problem 3
(a) Consider
x[n]
=
{
0,
1, 0 ≤ n ≤N-1
otherwise
_and_h[n] = {
1, 0 ≤ n ≤M-1
0, otherwise
with N > M. Plot the sequence y[n] = x[n] × h[n]. Make sure to specify the amplitude values
*
and time indices n of y[n] where y[n] is constant.
(b) Express the number L of samples of y[n] that are non-zero in terms of M and N.
(c) Consider
x'[n]
=
{
0,
1, N₁ ≤ n ≤ N₂
otherwise
1, M₁n M₂
and h'[n] =
=
0, otherwise
',
and assume that №2 - N₁ = N-1 and M2 - M₁
=
x'[n] h'[n] is equal to a shifted version of y[n]. What is the value of the shift?
-
= M 1. Show that the sequence y'[n]
=
Home Work
Calculate I, and I2 in the two-port of Fig. below
20
211=602
2/30° V
V₁
%12=-142
721=-j4 2
Z22=82
+
V₂
94
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