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May 3, 2019 - Chapter 2. DC Motors and Generators. 2.1. BASIC THEORY. HISTORICAL BACKGROUND. The direct current (DC) motor is one of the first machines devised to State how field strength can be varied in a dc generator. 8. Describe the cause of sparking between brushes and commutator. 9. State what is meant by "armatureMar 23, 2007 - Elementary DC Machines. • The armature winding of a dc generator is on the rotor with current conducted from it by means of carbon brushes. • The field winding are called field windings. ? The rotor contains the commutator and the conductors across which emf is induced. This part is called armature. DC Machines Apr 1, 2020 - DC MOTORS AND TESTING: Principle of operation, back EMF, torque equation, condition for maximum power developed, types of DC motors, armature reaction Lecture Notes ELE-A6 DC Machine 3/23/2007 ELEC A6 DC Machine 1 DIRECT CURRENT (DC) MACHINES Fundamentals • Generator action: An emf (voltage) Lecture Notes ELE-A6 DC Machine 3/23/2007 ELEC A6 DC Machine 1 DIRECT CURRENT (DC) MACHINES Fundamentals • Generator action: An emf (voltage)