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.

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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 =
%
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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