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The illustrations below schematically show the different methods
of connecting the field and
armature circuits in a DC
motor. The circular
symbol represents the
armature circuit, and the
squares at the side of the
circle represent the brush
commutator system. The
direction of the arrows
indicates the direction of
the magnetic fields.
Externally - Excited DC Motor
This type of DC motor is constructed such that the field is not connected to the armature. This type of DC motor is not normally used. |
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Shunt DC Motor
The motor is called a "shunt" motor because
the field is in parallel, or "shunts" the armature. |
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Series DC Motor
The motor field windings for a series motor
are in series with the armature. |
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Compound DC Motor
A compounded DC motor is
constructed so that it contains both a shunt and a series field. This particular schematic shows
a cumulatively-compounded" DC motor because the shunt and series fields are
aiding one another. |
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Compounded DC Motor
Compound DC Motor is also called a "differentially-compounded" DC motor because the shunt and series field oppose one another |
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