A 141 V, DC separately excited motor drives a variable torque load T1, = 0.01 N at 1150 rpm speed. The armature and field resistances are 0.3 N and 150 N, respectively. The motor draws a line current of 10 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer the following questions.
A 141 V, DC separately excited motor drives a variable torque load T1, = 0.01 N at 1150 rpm speed. The armature and field resistances are 0.3 N and 150 N, respectively. The motor draws a line current of 10 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer the following questions.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
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Publisher:Robert L. Boylestad
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Section: Chapter Questions
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Question
![A 141 V, DC separately excited motor drives a variable torque load TL = 0.01 N at 1150 rpm
speed. The armature and field resistances are 0.3 N and 150 N, respectively. The motor draws
a line current of 10 A at the given load. If rotational losse is equal to Prot = 0.1 Pin,
the following questions.
answer
1- Calculate the armature
voltage to reduce the speed by
55%.
V, =(
V
M1
2- Calculate the armature
Vt
Vf
voltage to operate the motor at
the holding condition.
Ea
V
V
3- Calculate the efficiency of the
motor at rated condition.
%
4- Calculate the efficiency of the motor for part 1.
7 =
%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F63f08983-2fa3-4d0d-af17-d131f2d02cbc%2Faa327a0f-b0e4-44c5-83ff-16ccf529c8bc%2Fsiaz3ff_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 141 V, DC separately excited motor drives a variable torque load TL = 0.01 N at 1150 rpm
speed. The armature and field resistances are 0.3 N and 150 N, respectively. The motor draws
a line current of 10 A at the given load. If rotational losse is equal to Prot = 0.1 Pin,
the following questions.
answer
1- Calculate the armature
voltage to reduce the speed by
55%.
V, =(
V
M1
2- Calculate the armature
Vt
Vf
voltage to operate the motor at
the holding condition.
Ea
V
V
3- Calculate the efficiency of the
motor at rated condition.
%
4- Calculate the efficiency of the motor for part 1.
7 =
%
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