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2-Pole Turbine GeneratorsStator ConstructionGenerator stator
frame construction isolates normal coregenerated double frequency
vibration from the foundationand distributes airflow to provide
uniform temperatures in
the core.
Stator frame center fabrication
Circular StudsLarge diameter circular studs are welded to the
machinedstator bore to give added support and act as keys for
corelamination stacking. Steel wrapper plates enclose the framand
provide additional support.
Frame-TEWAC or Room Air CooledThe stator frame is designed to
provide either a totallyenclosed water-air-cooled (TEWAC) or a room
air cooled(RAC) housing for the generator. Air is recirculated in
theTEWAC machine through air to water heat exchangers.
Air is circulated in the RAC machine with intake airdrawing in
the ends and air discharged out the top center.The frame is
fabricated from thick steel plates with allweldments specially
controlled to assure integrity ofstructure. The cross section
plates are cut on a numericall
controlled machine to assure uniformity from section
tosection.
www.electricmachinery.c
Flexible Stator CoreMounting(Model series 2800 and larger)
For each complete revolutionof the rotor, every portion ofthe
stator is twice subjected tothe strong magnetic attraction
of a rotor field pole. At 3,600rpm this causes 120 vibrationsper
second, producing acharacteristic low frequencyhum. To absorb this
vibration,and to minimize audible lowfrequency hum, the stator
coreis flexibly mounted.
The flexible core mountingdesign is based on the thin
cylinder principle, whichrecognizes that cylinders canprovide
flexibility in the radialdirection and still supportheavy loads in
a tangentialdirection.
The cylindrical mountings aresectioned to provide supportat each
end of the stator andin the center of the core. The
core supports are fastenedto the ends of the cylinderswith steel
plates. Frame platesconnect the opposite end ofeach cylinder to the
foot plate.The pulsation of the core isabsorbed by the
cylindersrather than being transmittedto the foundation.
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ELECTRIC MACHINERY COMPANY
800 Central Avenue NEMinneapolis, MN 55413United StatesTel: +1
(612) 378 8000Fax: +1 (612) 378 8051
www.electricmachinery.com
2-Pole Turbine GeneratorsStator Construction
Transforming Energy into Solutions www.weg.net/us
For more information, please
contact:E-mail:[email protected]
Phone: 24 Hour Customer Support: +1 (612) 247-9232
Stator CoreThe stator core consists of high silicon electrical
steel laminations that are blanked and notchedsimultaneously for
special high quality core plated sheet steel. After the punching
operation, eachlamination is precision edge ground to remove burrs.
The burr grinding process is controlled soaccurately that the burr
is removed without destroying the core plated insulation film. The
laminationsegments are stacked on circular studs, which extend
lengthwise within the stator frame. As the statorcore laminations
are stacked, vent duct spacers are inserted at specific intervals
to provide coolingpassages in the stator core for uniform cooling.
Special care is taken to assure accurate slot alignmentover the
length of the core.
Accurate clamping pressure is applied to both ends of the stator
core through non-magnetic pressureplates. These plates and the
tooth support fingers have a special concave design. When
properlypressurized, they will exert a uniform pressure on the face
of the stator core teeth as well as the backof the stator core.
Stacked stator frame ready for winding of stator coiInstallation
of stator core clamping plates on lamination stack
End StacksThe end sections of the stator core are stepped back
from the air gap to minimize fringing flux and toreduce end iron
heating when the machine is operated outside of the normal power
factor range.
