I would have varnished the stator with high strength with epoxy, cured it, changed the beariings to high speed bearings abd operated it at twice the speed.

It will then make 100Hz sine wave AC if it made 50Hz sinewave before.

The epoxy and balance is to keep wire in slots at high speed. the new bearings, same, for highs peed.

Perhaps, but why the technique of serviceman is not correct?

REGARDS
MSJ

The machine was designed to run at a certain speed and make 50Hz power. Trying to maintain that speed and doubling the number of poles the stator or rotor has might not work. This is a complex task and he may have done it wrong

Is the generator single or three phase?

Greg Lynch

Three phase

REGARDS

MSJ

My reply:
Other than pure sine wave have harmonics; but keep in mind it depends that Even or Odd
harmonics are in the distorted wave-form
Square & Triangular waveforms have only one of the even or odd harmonics, I donot remember. Fourier Analysis can reveal it.
So filter may pass such harmonics if those are there in waveform.

However by doubling the speed of course will produce 100 Hz if the machine can withstand such speed.

Not the speed & Bearings may help to withstand but only for TEST-RUN & Structure may give-up at that speed.

Thank you very much DEAR HAAGEE ,we can add as follows:

According to electromagnetic laws, the curl of electrical field (E) must be zero, for the circulation is zero, and the curl of magnetic field (H) is not zero, however; its circulation per unit area is the current density by Ampere's circuital law.Therefor in all magnetic systems, if some magnetic flux lines export from a surface of one volume of space, then same flux lines import to that volume via its other surfaces.

It means, for mathematic function of magnetic flux we can write: f(-x) = f(x) that named odd function.

Also according to Fourier analysis, each periodical odd function can be written with the sum of odd harmonic elements. So the serviceman can never produce even harmonic flux ( 100HZ,200HZ,…) in generator gap.

BEST REGARDS

MSJ

quote " It means, for mathematic function of magnetic flux we can write: f(-x) = f(x) that named odd function." quote

That sentence shall be corrected as follows:

It means, for mathematic function of magnetic flux we can write: f(-x) = - f(x) that named odd function. Also because of core symmetrical construction, the flux function can be written by f ( x ) = f ( L – x ) where 2L is the function period.

REGARDS

MSJ