A compound motor has two field windings. One is a shunt field connected in parallel with the armature; the other is a series field that is connected in series with the armature.
The shunt field gives this type of motor the constant speed advantage of a regular shunt motor. The series field gives it the advantage of being able to develop a large torque when the motor is started under a heavy load. It should not be a surprise that the compound motor has both shunt- and series-motor characteristics.
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