Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 22, Problem 5SQ
To determine
Redraw Figure 22-3 for the tripped out condition of motor M2 and M3 due to overload.
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Question 9
What factors affect the torque of a dc motor?
(Select all that applies)
A) Number of armature conductors
B) Type of armature winding
C) Armature current
D) Field current
E) Speed of the motor
F
Number of poles
2
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b.
3
5
A 30 hp, three-phase, wye connected, 60 Hz, 360 VLL, synchronous motor is operating at 50% full load,
rated voltage and 0.8 pf leading (over-excited). The motor has negligible armature resistance and a
synchronous reactance of 2.5 02/phase. Stator core loss is 1kW and friction and windage loss is 1.5 kW.
a. Calculate the new value of line-to-neutral excitation voltage and load angle when the field
current is adjusted for 0.85 pf lagging with the same 15 hp load.
Determine the load angle, current (with angle), and the reactive power exported (positive) or
imported (negative), when the motor load is 30 hp and the line-to-neutral excitation voltage is
255V.
Get genu
7
Q2 ) I.
What is the effect of chang ing the sequence of
phases in the electric feeder (single phase, three-phase)
motor? How do you correct the defect if necessary?
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