DESCRIPTION OF ALTERNATOR. (Refer to Figure 24-28.)
The principal components of the alternator are the brush holder assembly, the slip ring end head, the
rectifiers, the stator, the rotor and the drive end head.
1. The brush holder assembly contains two brushes, two brush springs, a brush holder and insulator. One
brush is connected to a terminal stud and is insulated from ground. The other brush is connected to ground
through the brush holder. The brush and holder assembly can easily be removed for inspection or brush
replacement purposes.
2. The slip ring end head provides the mounting for the rectifiers and rectifier mounting plate, output and
auxiliary terminal studs, and the brush and holder assembly. The slip ring end head contains a roller bearing
and outer race assembly and a grease seal.
3. The rectifiers used in these units are rated at 150 peak inverse voltage (P.I.V.) minimum for transient
voltage protection. Three positive rectifiers are mounted in the rectifier mounting plate while the three negative
rectifiers are mounted in the slip ring end head. Each pair of rectifiers is connected to a stator lead with high
temperature solder. The stator leads are anchored to the rectifier mounting plate with epoxy cement for
vibration protection.
4. The stator contains a special lead which is connected to the center of the three phase windings. The
stator has been treated with a special epoxy varnish for high temperature resistance.
5. The rotor contains the slip ring end bearing inner race and spacer on the slip ring end of the shaft. The
rotor winding and winding leads have been specially treated with a high temperature epoxy cement to provide
vibration and temperature resistance characteristics. High temperature solder is used to secure the winding
leads to the slip rings.
6. The drive end head supports a sealed, pre-lubricated ball bearing in which the drive end of the rotor
shaft rotates.
Figure 24-28. Exploded View of Alternator (Prestolite)
24-33-03
EFFECTIVITY: Page 24-28
PRESTOLITE ALTERNATOR Revised: July 13, 1983
1I23
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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