TECO-Westinghouse synchronous motor are also available with brush
rigging and collector rings. The complete assembly is designed
for long life and is easily accessible for inspection and routine
maintenance. Made of steel or other suitable materials, the collector
rings are shrunk onto a steel mandrel over a Micarta insulation
sleeve. The assembly is held in place on the motor shaft by a
tight press fit. To ensure permanent concentricity, collector
ring surfaces are machine finished and polished after assembly
on the rotor shaft. The brush rigging consists of cast-brass brushholders
mounted on insulated steel rods, which are supported from the
bearing pedestal. The number of brushes for a particular sized
and rating depends on the field current, and sufficient brushes
are supplied to limit the current density to a low value for trouble-free
operation. Brushes are of the electrographitic type and are specially
selected for each application.
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