EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 45, Problem 3RQ
To determine
Whether the excitation current can be applied to the rotor of a synchronous motor before it is started.
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The cable exerts a force of P = 4 kN at the end of the 8-m-long crane boom.
A
P
8 m
B
-x-
I'm
En
▾ Part A
If 0 = 30°, determine the placement x of the boom at B so that this force creates a maximum moment about point O.
Express your answer to three significant figures and include the appropriate units.
x = 9.81 m
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▾ Part B
What is this moment?
Express your answer to three significant figures and include the appropriate units. Assume the positive direction is
counterclockwise.
(Mo) max 43.7
=
E
?
N
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EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
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- The shaft shown in the sketch is subjected to tensile torsional and bending loads Determine the principal stresses at the location of stress concentration ✓ D=45MR F=3MM 1000-M 1000N チ d=30mm 500N 150 мм MM- 120 MA-arrow_forwardcalculate moment of inertia of this tapered beam structurearrow_forwardThe system shown below is in statics equilibrium. Cable OB lies in the xy plane and makes a 30° angle with the positive x-axis. Cable OA lies along the negative y-axis. If the weight of the load being supported is 100 lb, determine the magnitude of the forces in all four cables: OA, OB, OC, and OD.arrow_forward
- This is a mechanics/statics problem involving finding internal reactions, V(x) and M(x). Please refer to image for details. I'm not sure about where to take cuts and how to formulate the equations as a function of x. For my support Reactions I got Ay = 1008.33 lb, By = 1416.67 lb and Cy = 175 lb. and for the first cut V(x) = 1008.33 -250(x) and M(x) = 1008.33x - 125x^2. I'm struggling with the equations for the 2nd and 3rd cut.arrow_forwardAs shown in the figure below, a ring is used to suspend a load and is supported by Cable OA and Spring OB. Given that the tension in Cable OA is 400 N, what is the weight of the load being supported? Assume the system is in static equilibrium.arrow_forward4. (a) State the conditions that must be met to ensure dynamic balance is achieved for long rotors. (b) A rotor carries three out-of-balance discs in planes A, B and C as shown in Figure 4. The out-of- balance mass x radius products of the rotor discs are tabulated in Table 4. The shaft is to be dynamically balanced by adding balancing masses in planes P and Q, spaced along the shaft at a distance da = 800 mm. Determine the magnitude mara and angular position of the balancing mass x radius product that must be added to plane Q. MBB Ов θε mdc Мага End View on Plane P P MBB MATA dA dB dc do Figure 4 moc Table 4 MATA = 0.6 kg mm 6A = 0° d₁ = 200 mm mers = 0.2 kg mm 6g = 45° dB = 400 mm mcrc = 0.4 kg mm Bc=240° dc = 600 mm Ans. (b) = 110.5°, moro = 0.2 kg mmarrow_forward
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