from
DynamatorInnards Images taken by Jim Northrup while disassembling Dynamator from
Mort Resnicoff. Images are thumbnails, click on image to enlarge it
The one nice thing about alternators is the thin wires of the
field windings don't require hardly any current so the brushes and
slip rings have life easy. A DC generator has the heavy armature
current course through the brushes and commutator on the shaft. But
neither set of brushes last forever. If the alternator brushes were
as heavy duty as the generators, they might never need replacing.
There are brushless alternators.
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DynInnards2
0001.jpg
looking down the rear of the housing, the circular bearing support
is in the center and the silver rectifier is visible. In this case,
the rectifier is grounded to positive and the white wire is negative
for a positive grounded vehicle. The negative ground alternator is
grounded to negative and the white wire would be positive. This is
the only real difference between the two units.
8.jpg
rotor with field windings, tach drive shaft, bushing. Note that the
part of the stub shaft that rides in the bushing is cut on both
sides. Not an ideal configuration for a bearing surface.
0003.jpg
rotor with stub shaft engaged via tang and slot. Note there is no
support on that end of the stub shaft and there is a lot of slop.
7.jpg
front bracket with rotor bearing and hardware.
0006.jpg
rotor and front bracket assembled.