A DC motor can be made using different types of armatures based on its application. There are 2 types of armatures.
Ring armature hi-res stock photography and images - Page 2 - Alamy
COMPOUND MOTORS
C R E A T I V I T Y: Armature and Its Windings
Gramme Ring and Drum Wound Armature in DC Motors
Damping Systems - Air friction, Fluid Friction & Eddy Current Damping
Armature Reaction in Alternator
Armature electric motor hi-res stock photography and images - Alamy
Dynamo Parts, PDF, Electric Motor
DC Motor