These types of motors provide desirable characteristics of both series- and shunt-wound motors. They provide high-starting torque as in a series motor, as well as good speed regulation as in a shunt-wound motor.
In these types of motors, there are two field windings; one is in series with the armature, while the other is in parallel with the armature.
In the compound-wound motor, the speed variation due to load changes is much less than that in the series-wound motor, but greater than that in the shunt-wound motor. The compound-wound motor has greater starting torque than the shunt-wound motor and is able to withstand heavier loads for narrow adjustable-speed range (Figures 4.11 and 4.12).