EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 49, Problem 4RQ
A motor is tripping out on overload. The motor nameplate reveals a full-load current of 168 amperes. When the motor is operating under load, an ammeter indicates the following: Phase 1 = 166 amperes, Phase 2 = 164 amperes, and Phase 3 = 225 amperes. What is the most likely problem with this motor?
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 49 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
Ch. 49 - Prob. 1RQCh. 49 - What is the advantage of a plunger-type voltage...Ch. 49 - A motor is tripping out on overload. The motor...Ch. 49 - A motor is tripping out on overload. The motor...Ch. 49 - Prob. 5RQCh. 49 - Refer to the circuit shown in Figure 4916. Assume...Ch. 49 - Prob. 7RQCh. 49 - Refer to the circuit shown in Figure 49–20. Assume...Ch. 49 - Prob. 9RQCh. 49 - Refer to the circuit shown in Figure 4920. Assume...
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