ABSTRACT
This chapter discusses DC machines; in particularly, separately excited, shunt-connected, series-connected, compound-connected, and permanent-magnet DC motors and generators. Electric machines have certain basic features; however, one should distinguish direct-current, induction, and synchronous machines. The significance of the doubly excited transducer studied is that energy-transfer electromechanical motion device gives an indispensable example for analysis and understanding of the basic features in operation and torque production of the commutator-type DC electric machines, as well as induction and synchronous machines. Series-connected DC machines have their field winding in series with the armature winding. Therefore, the armature current ensures the field excitation. Permanent-magnet motors have been widely used in high-performance electric drives and servo-systems. The permanent-magnet DC generator is driven by the permanent-magnet DC motor, and the voltage, induced by the generator, is supplied to the armature winding of the permanent-magnet traction DC motor.
