Example 4: Consider a shunt DC motor with the following values for nominal terminal voltage, armature resistance and field resistance: V=230 V % = 0.3 2 r, =160 Ω Ω Assume the no-load rotational velocity is 1200 rpm, the terminal current at no-load condition is 3.938 A and the nominal armature current is 40 A. a) Calculate the armature current at no-load condition. b) Calculate the developed power at no-load condition. c) Calculate the efficiency of the motor at nominal condition.

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Example 4: Consider a shunt DC motor with the following values for
nominal terminal voltage, armature resistance and field resistance:
VtH = 230 V
* = 0,3 Ω
r, =160 Ω
Assume the no-load rotational velocity is 1200 rpm, the terminal
current at no-load condition is 3.938 A and the nominal armature
current is 40 A.
a) Calculate the armature current at no-load condition.
b) Calculate the developed power at no-load condition.
c) Calculate the efficiency of the motor at nominal condition.
Transcribed Image Text:Example 4: Consider a shunt DC motor with the following values for nominal terminal voltage, armature resistance and field resistance: VtH = 230 V * = 0,3 Ω r, =160 Ω Assume the no-load rotational velocity is 1200 rpm, the terminal current at no-load condition is 3.938 A and the nominal armature current is 40 A. a) Calculate the armature current at no-load condition. b) Calculate the developed power at no-load condition. c) Calculate the efficiency of the motor at nominal condition.
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