Electric Motors and Control Systems
Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 2.4, Problem 1RQ

Interpret what each of the following pieces of name-plate information specifics:
a. Voltage rating
b. Current rating
c. Phase rating
d. Motor speed
e. Ambient temperature
f. Temperature rise
g. Insulation class
h. Duty cycle
i. Horsepower rating
j. Code letter
k. Design letter

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The excitation of a three-phase synchronous motor connected in parallel with a load of 500 kW operating at 0-85 p.f. lagging is adjusted to improve the overall p.f. of the system to 0.95 lagging. If the mechanical load on the motor is 120 kW, calculate the kVA input to the synchronous motor and its p.f.?

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