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MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
4th Edition
ISBN: 9781337798754
Author: Herman; Stephen L.
Publisher: Cengage Learning US
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Chapter 34, Problem 1RQ
To determine
Identify whether varying the voltage of an AC induction motor changes the synchronous speed.
Expert Solution & Answer
Explanation of Solution
Synchronous speed:
The speed at which the magnetic field rotates in a motor is called the synchronous speed. The synchronous speed is given by the following formula:
Here, the synchronous speed in RPM is s, the frequency in Hz is f, and the number of stator poles per phase is P.
The two factors that determine the synchronous speed of the motor are given below:
- The number of stator poles per phase.
- The frequency of the applied voltage.
Hence, the synchronous speed will change only when the frequency of the applied voltage is changed and not the quantity of voltage. Changing the voltage will change the motor running speed. However, the running speed is not the synchronous speed.
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Students have asked these similar questions
Q1.Given the unity feedback system with a forward path transfer function,
G(s) =
=
K
(s+1)(s+2)(s+6)
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(b) Find the gain, K, and natural frequency for a damping ratio 0.5.
(c) Find the range or value of gain, K for
i. overdamped ii. critically damped iii. Undamped iv. underdamped
Q. 1: The partial Routh array of a unity feedback system is given below.
S6
1
Adel
8
S5
1
S4
2
Bash
6
-4
0
C
0
How many roots does it have in the right half plane? Comment on the
stability of the system. Determine the characteristic equation of the system.
Q.2: Find the values of Ki and K2 for the system shown in the figure below
when Mp=0.25% and tp= 4 sec. assume unit step input.
R(S)
K₁
C(S)
1+ K₂S
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EXAMPLE 1: A diesel engine is fitted with a turbocharger,
which comprises a radial compressor driven by a radial
exhaust gas turbine. The air is drawn into the compressor at
a pressure of 0.95 bar and at a temperature of 15°C, and
is delivered to the engine at a pressure of 2.0 bar. The
engine is operating on a gravimetric air/fuel ratio of 18: 1,
and the exhaust leaves the engine at a temperature of
600°C and at a pressure of 1.8 bar; the turbine exhausts at
1.05 bar. The isentropic efficiencies of the compressor and T(K)
turbine are 70 per cent and 80 per cent, respectively.
Calculate (i) the temperature of the air leaving the
compressor (ii) the temperature of the gases leaving the
turbine (iii) the mechanical power loss in the turbocharger
expressed as a percentage of the power generated in the
turbine. Using the values of : Cpair = 1.01 kJ/kg K, Vair = 1.4
Cpex = 1.15 kJ/kg K, Yex = 1.33
and
2s
с
P2
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P3
W
W₁ = mexpex (T3-TA)
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4
P4…
Chapter 34 Solutions
MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
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