Both supply and machine
converters usually operate 12-pulse
mode and most are equipped with water-
cooled thyristors. The maximum speed possible for a
synchronous motor this kind arrangement
varies with power rating, but cannot exceed
about 7500 rpm due the constraints the
rotor and exciter design (see diagram on
page 4)..
12
. The individual
power ratings range from 2.. all cases, the
performance these high-speed drives has
been excellent and they are operating the
full satisfaction the users.
Proven converter design
The LCI converter used supply variable
voltage and frequency high-speed
synchronous motor basically the same
as those already described for operation at
normal speeds.High-speed synchronous motor drives
The maximum possible speed directly
connected two-pole synchronous motor on
a system 3000, respectively
3600 rpm.5 and they operate speeds to
6500 rpm.
Higher speeds can obtained from two-
pole motor inserting frequency converter
in the motor supply which applies frequencies
higher than the power system frequency
to it. They are used mainly for
driving boiler feed pumps power plants
and large compressors gas and chemicals
and various kinds test bays. The only difference the
higher output frequency which can as
high 125 Hz. Drives for applications hazardous
areas have been constructed meet the
corresponding standards and have been
certified authorities following extensive
testing the works. 5222 rpm
Short-time rating:
13 5700 rpm
High-speed drive references
Since the first high-speed synchronous
motors with LCI frequency converters went
into service the beginning the 80’s, ABB
has installed more than with total power
of about 700 MW.
High-speed drive applications
• compressors for drives gas and
chemicals
• boiler feed pumps power plants
• drives for test bays
Advantages
• gears and therefore higher reliability
and availability
• reduced length shaft train
• much improved drive efficiency
• low maintenance costs
High-speed synchronous
motor driving boiler feed
pump power plant
Continuous rating:
10 MW
Speed range:
5 0.5 to
41
