MECHANICAL CONTRACTING e Continued from p 80
shaft adjacent to the end bracket was coated with AEGIS colloidal silver. Next, the ring was opened, centered around the shaft, taped closed and pushed against the end bracket. The entire installation took about 10 minutes. Approximately an hour after
installation, the epoxy had cured sufficiently to allow testing of the motor again with the oscilloscope and probe. This time, the oscilloscope discharge plot was essentially a flat line, indicating that shaft voltage discharges were being diverted by the AEGIS ring to ground. On Motor 2, pre-installation peak-
When a voltage probe was held against the motor shaft, the oscilloscope (set at 10 volts and 100 microseconds per division) indicated peak-to-peak discharges of 61 volts.
82
Paint was removed from the motor end bracket with a Dremel®
rotary
tool, exposing enough bare metal to mount the AEGIS split ring. The
two-part conductive epoxy (included in the manufacturer’s kit) was mixed and applied to the back of the ring. To enhance conductivity, the motor
to-peak shaft discharges measured 50.8 volts. The shaft was prepared, but because it was difficult to reach and only a couple of inches of it between the end bell and a sheave were exposed, the versatility of the AEGIS split ring and its ease of installation using conductive epoxy were even more apparent. A hand-held heater was used to speed the epoxy’s cure, and, about
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phc may 2011
www.phcnews.com
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