Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 49, Problem 1SQ
To determine
Explain the reason for using magnetic brakes.
Expert Solution & Answer
Explanation of Solution
An electric brake also known as magnetic brake which consists of two friction surfaces or shoes that can be made to bear on a wheel on the motor shaft. Refer to Figure 49-1 in the textbook, the shoes are held by the spring tension on the wheel. Due to the friction between the wheel and shoes, the braking is achieved.
Magnetic brakes provide a smooth braking action and used for high inertia loads. Since these brakes apply and remove the braking pressure in either direction, it is recommended to use in cranes, hoists, elevators, and to increase the production of the industrial machinery. These magnetic brakes can limit the shock of braking.
Conclusion:
Thus, the reasons for using magnetic brakes are 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
Chapter 49 Solutions
Electric Motor Control
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