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The uppermost portion of the shaft is used to mount the shaft into the rotator (see
Figure 4.1). This mounting area is electrically isolated from the remainder of the
shaft so that the electrode connections remain isolated from the rotator chassis.
An insulating spacer just below the mounting area isolates the mounting area
from the electrode contact area.
For an RDE or RCE shaft (see Figure 4.1, left), the entire metal exterior of the shaft
below the insulating spacer is in electrical contact with the disk (or cylinder)
electrode. For an RRDE shaft (see Figure 4.1, right), there are two insulating
spacers. The portion of the shaft between the two insulating spacers provides
electrical contact with the disk electrode. The lower portion of the shaft (below
the lower insulating spacer) provides electrical contact with the ring electrode.
Figure 4.2: The Brush Chamber (side view)
The shaft is connected to the rotator motor via a brass motor coupling located
inside the brush chamber (see Figure 4.2). Two clamshell doors surround the brush
chamber. These doors are securely latched during rotator operation and push
two pairs of contact brushes against the rotating shaft. The upper (red) pair of
brushes makes contact with the disk (or cylinder) while the lower (blue) pair makes
contact with the ring on a rotating ring-disk electrode.
Содержание MSR 636A
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