OBJECTIVES
DC Generators
TERMINAL OBJECTIVE
1.0
Given the type and application of a direct current (DC) generator, DESCRIBE the
operating characteristics of that generator including methods of voltage production,
advantages of each type, and voltage-vs-load characteristics.
ENABLING OBJECTIVES
1.1
DEFINE terminal voltage as it applies to DC generators.
1.2
DEFINE counter-electromotive force (CEMF) as it applies to a DC machine.
1.3
DESCRIBE the effects of commutation in a DC generator.
1.4
STATE the purpose of each of the following components of a DC machine:
a.
Armature
b.
Rotor
c.
Stator
d.
Field
1.5
LIST the three conditions necessary to induce a voltage into a conductor.
1.6
Using the left-hand rule of generators, DETERMINE the direction of the magnetic field,
the motion of the conductor, or the direction of current induced into a conductor.
1.7
DESCRIBE how terminal voltage of a DC generator is adjusted.
1.8
STATE the basis behind each of the four DC generator ratings.
1.9
LIST the four internal losses found in a DC generator.
1.10
DESCRIBE the differences in construction between a shunt-wound and a series-wound
DC generator with respect to the relationship between the field and the armature.
1.11
DESCRIBE the relationship between the shunt and series fields for cumulatively-
compounded and differentially-compounded DC generators.
ES-05
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