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6.2.5 DC motor characteristics
It is possible to design a motor with characteristics that are most suitable for
a particular task. For a comparison between the main types of DC motor, the
speed–torque characteristics are shown in Figure 6.16. The four main types
of motor are referred to as shunt wound, series wound, compound wound and
permanent magnet excitation.
In shunt wound motors, the eld winding is connected in parallel with the
armature as shown in Figure 6.17. Due to the constant excitation of the elds,
the speed of this motor remains constant, virtually independent of torque.
Series wound motors have the eld and armature ...