Example 9.2 || (English)(Chapman)
DC Motors- Shunt Motor

Example 9.2: A 5O-hp, 250-V, 1200 r/min dc shunt motor without compensating
windings has an armature resistance (including the brushes and interpoles) of 0.06 n. It s field circuit has a total resistance RF + Radj of 50 n, which produces a no-load speed of 1200 r/min. There are 1200 turns per pole on the shunt field winding, and the armature re-action produces a demagnetizing magnetomotive force of 840 A • turns at a load current of 200 A. The magnetization curve of this machine is shown in Figure 9-9.
(a) Find the speed of this motor when it s input current is 200 A.
(b) This motor is essentially identical to the one in Example 9- 1 except for the ab-
sence of compensating windings. How does its speed compare to that of the pre-
vious motor at a load current of 200 A?
(c) Calculate and plot the torque-speed characteristic for this motor.

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