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Synchronous Generator with variable speed

P

Philippe

Jan 1, 1970
0
Dear All,
I would like to know if it is possible to operate a synchronous generator
with a rotor energized with an AC supply under variable speed condition.

Thanks for help
 
S

SQLit

Jan 1, 1970
0
Philippe said:
Dear All,
I would like to know if it is possible to operate a synchronous generator
with a rotor energized with an AC supply under variable speed condition.

Thanks for help

Your statement is as big as Alaska.

Yes with in the tolerances of the controls.
Varying the speed of the generator will result in varying the hertz
produced.
 
T

Tom Grayson

Jan 1, 1970
0
What are you hoping to achieve in doing this?

changing the Rotor polarity slowly will result in the output voltage of the
alternator changing with the changing field current. When the polarity of
the field reversed the polarity of the AV Coltaged will do an instaneous 180
degree shift. Is this what you had in mind ?
Tom Grayson
 
P

Paul Hovnanian P.E.

Jan 1, 1970
0
Philippe said:
Dear All,
I would like to know if it is possible to operate a synchronous generator
with a rotor energized with an AC supply under variable speed condition.

What is the intent of doing this? Constant output frequency for a
variable input speed?

It can be done, particularly if the input speed range remains within a
given range. If you want something to work from 0 to some max. RPM, it
will get tricky .
 
P

Philippe

Jan 1, 1970
0
It was just an idea.
I was asking myself if a signal elaborated by the difference between speed
and fixed frequency can eventualy drive the AVR to maintain the voltage on
the stator.
Of course i'm sure that the technology of the rotor may be very complex.
We may found application for hydroelectric plant perhaps.
 
P

Paul Hovnanian P.E.

Jan 1, 1970
0
Philippe said:
It was just an idea.
I was asking myself if a signal elaborated by the difference between speed
and fixed frequency can eventualy drive the AVR to maintain the voltage on
the stator.
Of course i'm sure that the technology of the rotor may be very complex.
We may found application for hydroelectric plant perhaps.

Its more appropriate for a prime mover whose speed must be regulated for
some other application and the generator is a secondary load. Automotive
or aircraft engines are an example, where the RPM is dictated by
propulsion requirements.

Rather than some complex rotor drive circuitry, the approach is to let
the generator follow the prime mover's speed and generate variable
frequeencies. The output is then rectified and used to produce fixed
frequency AC via various solid state switching topologies.
 
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