A 30 hp, 240 V, 1150 rpm DC shunt motor, operating at rated conditions, has an efficiency of 88.5 percent. The armature resistance is 0.064 2 and the field resistance is 93.6 . Draw an equivalent circuit for the motor, and determine: a. what percentage of the total losses are due to rotation losses; b. the external resistance needed in series with the armature circuit to limit the starting current to 175 percent of rated armature current on start-up; and, C. the new speed if the flux is reduced by 10 percent and the shaft load is adjusted to maintain rated armature current.
A 30 hp, 240 V, 1150 rpm DC shunt motor, operating at rated conditions, has an efficiency of 88.5 percent. The armature resistance is 0.064 2 and the field resistance is 93.6 . Draw an equivalent circuit for the motor, and determine: a. what percentage of the total losses are due to rotation losses; b. the external resistance needed in series with the armature circuit to limit the starting current to 175 percent of rated armature current on start-up; and, C. the new speed if the flux is reduced by 10 percent and the shaft load is adjusted to maintain rated armature current.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:A 30 hp, 240 V, 1150 rpm DC shunt motor, operating at rated conditions, has an efficiency
of 88.5 percent. The armature resistance is 0.064 Q and the field resistance is 93.6 Q. Draw
an equivalent circuit for the motor, and determine:
a.
what percentage of the total losses are due to rotation losses;
b.
the external resistance needed in series with the armature circuit to limit the starting
current to 175 percent of rated armature current on start-up; and,
C.
the new speed if the flux is reduced by 10 percent and the shaft load is adjusted to
maintain rated armature current.
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