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(Solved): A separately excited DC motor is shown in Figure. It has a fixed field voltage V_(F) of 240 V and an ...
A separately excited DC motor is shown in Figure. It
has a fixed field voltage V_(F) of 240 V and an armature
voltage V_(A) that can be varied from 120 to 240 V.
Also, R_(adj) can be varied from 100 to 400 Ω.
(a) What is the no-load speed of this separately excited motor when R_(adj)= 175 Ω and V_(A)=180 V?
(b) What is the maximum and minimum no-load speed attainable by varying V_(A )when R_(adj)= 100 Ω?
(c) What is the maximum and minimum no-load speed attainable by varying V_(A) when R_(adj) = 400 Ω?