The retaining
rings are made high tensile strength
non-magnetic steel alloy and oppose the
centrifugal forces acting the rotor end
coils..
Established methods and the experience
gained over many years can thus directly
applied. There are two sets stator windings
shifted 30° eliminate the 6th and the
18th torque harmonics..Motor design
Extreme left: high-speed
EEx «p» synchronous
motor designed for driving
a five-stage compressor in
a chemical plant producing
ethylene
Rated power: MW
Speed
range: 00.
High-speed synchronous motor
Rated power: MW
Rated speed: 6000 rpm
13
. The cylindrical rotor
is forged monoblock which equally spaced
slots for the rotor coils are machined around
the circumference.
The exciter rotor and the diode wheel are
shrunk onto the end the shaft projecting
from the motor bearing and are supported
by third bearing. Two axial flow fans
provide self-ventilation and the air cooled
by air-to-water heat exchanger. The electrically conducting
slot wedges and the interconnecting retaining
rings form the damper winding. This ensures that critical
whirling speed cannot occur within the normal
operating speed range. 6400 rpm
In general, the mechanical and electrical
design high-speed synchronous motor
corresponds that standard ABB air-
cooled turboalternator slightly modified for
supply converter
