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2.1.3 Rotor
Main machine and exciter rotors are fitted together with rotating rectifier and fan on the same shaft.
Generator rotor is a compact component with cylindrical or salient-type poles and a squirrel-cage damper in a
magnetic field. The rotor itself is supported by two bearings and is extended at the drive end. It is press-fitted
on the shaft and excited by an integrated exciter. Exciter rotor with plain poles is mounted on machine NDE
side. Rectifier in rotor circuit is fitted outside the machine on NDE side and is accessible after dismantling
rectifier cooler.
2.1.4 Stator
Main machine stator consists of a welded chassis in which a stator bundle is press-fitted and locked against
rotating. Stator bundle has a stator-sheet core, a main and auxiliary winding. Exciter stator is mounted in the
end shield on machine NDE side and is of a pole type. It is provided with permanent magnets intended to
excite the machine during starting.
2.1.5 Bearings
Generators are standard equipped with antifriction bearings with relubrication and grease amount
regulator. They are fitted in end shields. On request also plain bearings are mounted. In this case operating
instructions are complemented by a detailed description incl. operation.
2.1.6 Terminal box
Main winding spacious terminal box is fitted on the top of generator stator box. It contains all equipment
necessary for generator connection and operation. Standard generator model is supplied with an unbored
cable entry plate. PG screwed cable entry glands can be supplied on request. Regulation and measuring
circuits are always led to an independent LV terminal box.
2.1.7 Measuring and protective circuits
Generator is standard equipped with (if not otherwise requested): temperature sensors Pt 100 in stator
winding, bearing thermometers Pt 100 or 2xPt 100 in bearing caps, probes for mounting heating bodies.
On request sensors of internal air temperature and cooler water seepage can be fitted.
2.2 Electric characteristics
2.2.1 Output and raise of the temperature
Determined output that is stated on the name plate is intended for long-term operation with symmetrical
load, prescribed frequency and voltage, power factor cosϕ = 0,8 to 1,0, ambient air temperature according to
requirement and altitude of machine location up to 1000 m. Simultaneously, the machine is used in
compliance with temperature class (155) F according to IEC 60034-1.
2.2.2 Short-term current overload
Machines can bear short-term overload according to IEC 60034-1.
2.2.3 Voltage
Machines are standardly supplied with a star connection for voltage according to machine name plate.
ATTENTION!! Machines can be operated at voltage according to machine name plate.
2.2.4 Shape of a voltage curve
Time behaviour of terminal voltage during idle running and during symmetrical linear load is virtually
sinusoid with upper frequency response according to IEC 60034-1.
Product documentation 1D 3.8.en
Rev. E, 10/13
page 13/42
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