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(Solved): DC motor has following specifications including the magnetization curve and the shunt operated equiv ...



DC motor has following specifications including the magnetization curve and the shunt operated equivalent. (

12%

)

P_(reded )=15hp V_(T)=240V n_(red )=1200(r)/(m)in R_(A)=0.40\Omega R_(s)=0.04\Omega

I_(L stand )=55A

N_(r)=2700 turms per pole

N_(su)=27 turns per pole

R_(F)=100\Omega

|)

=100 to 400\Omega

(a) For any non-regular operational scenario what is the maximum possible armature current

I_(A)

that can flow in the motor? (b) If the resistor

R_(20)

is adjusted to

140\Omega

what is the rotational speed of the motor at no-load conditions? (c) What is the speed of the motor at full load? (d) If now an unexpected very big load on the rotor's axis reduces the motor's speed to 400 rpm what will be the motor's current?



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