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Appendix D: Optional equipment
The brushless type synchronous motor has distinct
advantages over the brush-type. Maintenance of the
brushless type is considerably simpler. The brushless type
does not require cleaning the slip ring collector, repairing
damaged or corroded slip rings, inspecting and replacing
worn brushes, etc. In addition, brush particles abraded from
the brushes and loose in the motor frame can deposit on the
motor windings, affecting insulation life.
In addition, the brushless type is more suitable for use in
adverse environmental conditions. Maintaining slip rings and
brushes under conditions like those found in chemical plants,
where steam, oil or corrosive gases are present, is very
difficult. Brushless motors designs for pressurized or
explosion-proof requirements are much simpler than with
slip rings and brushes.
The SC9000 EP drive system can include control and
excitation for brushless synchronous motors.
SC9000 EP synchronous motor control
The SC9000 EP Synchronous Motor control system provides
both stator and rotor control and power. The SC9000 EP
Adjustable Frequency Drive powers and protects the
synchronous motor's stator windings, while the separate
power and protection system provides the rotor windings
excitation. Figure 81 shows the SC9000 EP functional block
diagram for brushless synchronous motors.
Figure 81. SC9000 EP brushless synchronous motor control
76
SC9000 EP medium voltage drives IB020001EN—February 2016 www.eaton.com
The SC9000 EP directs the field exciter, based upon
configuration and settings parameters established in the
drive application software. For more information about the
application parameters, see Chapter 5, Parameter Group
G1.15, which includes parameters for enabling or disabling
the control, choosing control modes, setting control loop
constants, and so on.
Brush-type synchronous motor control
Although the SC9000 EP Synchronous Motor Control system
is designed for brushless synchronous motors, Eaton also
offers control systems for brush-type motors, powered by
Ampgard Medium Voltage Starters. For more information
about these systems, refer to Eaton IB 48045, Instructions
for Mark VI Solid-State, Brush-Type, Synchronous Motor
Controllers.
O&M technical references
For detailed information on your Synchronous Motor control
system, refer to the O&M manual, publications:
IB48045 Instructions For Ampgard
Brush-Type, Synchronous Motor Controllers
®
Mark 5.5 Solid-State,
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