dissipa Advanced level 16 The ar ma tor has a
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Number 12
![DIRECT-CURRENT MOTORS
alloys. Fig. 30 shows
V, 2900 r/min PM
b. Calculat
the moto
sures low inertia and
applications.
50 r/mir
a. The mmf per pole at full-load
b. The mmf at no-load
c. Compar
200 r/m
motors is the rela-
and the inability to
akening.
12 A separately excited dc motor turns at
dissipa
Advanced level
The arma
voltage required so that the motor runs at
1500 r/min. At 100 r/min.
tor has a
s and make a
The following details are known about a
250 hp, 230 V, 435 r/min dc shunt motor:
length of
a. The a
know
enerator ef-
kg/m
b. The
nominal full-load current: 862 A
and polarity
insulation class: H
wher
weight: 3400 kg
external diameter of the frame: 915 mm
c. The
ays
CoUPedicu
part
the
ure volt-
length of frame: 1260 mm
a. Calculate the total losses and efficiency
the
ary the
at full-load.
17 If we
b. Calculot](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F585e4a80-646c-4418-ada9-cb992a2ce44b%2F7955ad7e-204e-4720-99e2-1442e06bdb7f%2Fxmraa8e.jpeg&w=3840&q=75)
Transcribed Image Text:DIRECT-CURRENT MOTORS
alloys. Fig. 30 shows
V, 2900 r/min PM
b. Calculat
the moto
sures low inertia and
applications.
50 r/mir
a. The mmf per pole at full-load
b. The mmf at no-load
c. Compar
200 r/m
motors is the rela-
and the inability to
akening.
12 A separately excited dc motor turns at
dissipa
Advanced level
The arma
voltage required so that the motor runs at
1500 r/min. At 100 r/min.
tor has a
s and make a
The following details are known about a
250 hp, 230 V, 435 r/min dc shunt motor:
length of
a. The a
know
enerator ef-
kg/m
b. The
nominal full-load current: 862 A
and polarity
insulation class: H
wher
weight: 3400 kg
external diameter of the frame: 915 mm
c. The
ays
CoUPedicu
part
the
ure volt-
length of frame: 1260 mm
a. Calculate the total losses and efficiency
the
ary the
at full-load.
17 If we
b. Calculot
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