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7-7. An eight-pole, 25-kW, 120-V dc generator has a duplex lap-wound armature which has 64...

7-7. An eight-pole, 25-kW, 120-V dc generator has a duplex lap-wound armature which has 64 coils with 10 turns per coil. Its rated speed is 3600 r/min.

(a) How much flux per pole is required to produce the rated voltage in this generator at no-load conditions?

(b) What is the current per path in the armature of this generator at the rated load?

(c) What is the induced torque in this machine at the rated load?

(d) How many brushes must this motor have? How wide must each one be?

(e) If the resistance of this winding is

per turn, what is the armature resistance RA of this

machine?

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Solutions For Problems in Chapter 7
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