Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 54, Problem 1SQ
To determine
Write the formula for finding the speed of an AC squirrel cage induction motor.
Expert Solution & Answer
Answer to Problem 1SQ
The formula to find the speed of an AC squirrel cage induction motor is
Explanation of Solution
Discussion:
The squirrel cage induction motor’s speed depends on the frequency of the supply current and number of motor’s poles.
Write the expression to find the speed of an AC squirrel cage induction motor as follows:
Here
Hertz is the unit of frequency of supply current.
Rewrite the expression in Equation (1) in terms of number of poles of the motor as follows:
Conclusion:
Thus, the formula for finding the speed of an AC squirrel cage induction motor is
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
1. Please draw the root locus by hand for the following closed-loop system, where G(s)
s+8
S-2
and H(s) = Find the range of K for stability
Input
R(s)
Output
C(s)
KG(s)
H(s)
s+6
=
S-2
The state-space Jordan Canonical Form of the following system is:
Y(s)
8-5
U(s)
(+1)(+3)
Select one:
O a.
-1
0
0
A =
0
-1
0
B:
...
...
...
0
0
C [4 1.5 1.5], D=0
b.
-3 1
0
0
A =
0
-3
0
1
B
...
0
0
-1
C -4
-1.5 1.5], D=0
○ C.
-3 1
0
A =
0
-3
0
1
,B=
...
0
0
○ d.
C [4 1.5 1.5], D=0
-3 1
0
0
A =
0
-3
0
1
, B:
...
...
0
0
-1
C [4 1.5 1.5], D=0
-4 1
If=
x and (0):
=
then 2(t) is:
-4 0
Select one:
a. x2(t)=4te2t
O b. x2(t) = e2t+2te2t
Oc.
2(t)=-4te-21
Od. 2(t) e2-2te-2
=
Three speech signals are TDM multiplexed with a high-quanty music signal. It each speech
signal is sampled at 16 kHz and PCM quantized by 8 bits/sample, while the music signal is
sampled at 64 kHz with the same PCM quantizer.
1. Draw the block diagram of this TDM.
2. Calculate the output bit rate of this TDM.
Chapter 54 Solutions
Electric Motor Control
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 3- For the network below determine the value of R for maximum power to R (use Thevenin equivalent) and determine the value of maximum power R₁ 1.2Ω E + 12 V I D 10 A R₂60 6Ω Rarrow_forwardPlease solve this problem in detail to understandarrow_forwardQ3: (40 Marks) Single phase full bridge voltage source inverter has an RLC load with R-1002, L-31.5mH and C=112µF. The inverter frequency is 60Hz and de input voltage is 220V. (a) Express the instantaneous load current in Fourier series to third harmonic. (b) Calculate the RMS load current at the fundamental frequency (n=1). (c) Calculate the load power due to fundamental component (n=1).arrow_forward
- 12.3 Express each of the waveforms in Fig. P12.3 (on page 667) in terms of step functions and then determine its Laplace transform. [Recall that the ramp function is related to the step function by r(t − T) = (t − T) u(t − T).] Assume that all waveforms are zero for t<0. - - -arrow_forwardEvaluate each of the following integraarrow_forwardWith the aid of suitable diagrams, describe the benefits that antenna arrays have over singleelement antennas, with their applicationsarrow_forward
- Explain what is meant by an electric dipole antenna, sketch its radiation pattern, state itsdirectivity and describe its main applicationsarrow_forwardEstimate the length required for a half-waveelectric dipole antenna for transmitting/receiving EM waves at 800 MHz (this is in the UHFbandwidth of 470 to 860 MHz, used for UK TV transmissions).arrow_forwardIf the voltage waveform in Fig. 6.68 is applied to a 50-mH inductor, find the inductor current i(1). Assume i(0) = 0.arrow_forward
- Q3/A 8-pole, 3-phase, 50 Hz induction motor, running at 725 r.p.m, rotor is star connected its resistance and reactance 0.25 and 1.5 ohm per phase, the emf between slip rings is 100, find the rotor current per phase, power factor, synchronous speed, slip and rotor frequencyarrow_forward440 v, 4-pole, 3-phase, 50 Hz, star stator connected induction motor, full load speed 1425 r.p.m, rotor impedance 0.5+4.55ohm and rotor/stator ratio 0.8 calculate 1) starting torque, (2) rotor current (3) the value of external resistance to add to give maximum starting torque (4) power factor at maximum torque.arrow_forwardI would like to know the gear ratio and the tractive effort that a trolley must achieve with the following motor specifications: Voltage: 600 voltsSpeed: 1750 to 2300 RPMCurrent: 84 AmpsRated Power: 50-55 HP What percentage should be considered for gear efficiency, and what safe margin should be applied in these calculations? The constraints for the truck trolley are as follows:Maximum Speed: 50 MPHWeight of the Car Body: 46,000 lbs (the trolley weighs approximately 44,000 lbs)Diameter wheels: 86 inchesAdditionally, I would like to know how to plot a graph of tractive effort (in grams) versus speed (in MPH).arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning