Diesel Generator Coupling
Diesel Generator Coupling
(OP)
My coupling and alignment instructions for my diesel generator set call for #1 cylinder to be TDC and the generator rotor positioned with the north pole (@ the shaft key position) also TDC.
Why?
Why?





RE: Diesel Generator Coupling
RE: Diesel Generator Coupling
Muthu
www.edison.co.in
RE: Diesel Generator Coupling
There's no reason you couldn't do that on a generator, too, or add a nominal imbalance in the generator to counterbalance the rocking couple that comes with some engines.
Mike Halloran
Pembroke Pines, FL, USA
RE: Diesel Generator Coupling
RE: Diesel Generator Coupling
RE: Diesel Generator Coupling
The Diesel has a certain torque pulsing and the positioning of the generator poles relative to this might minimze the issue?
Just a thought.
Benta.
RE: Diesel Generator Coupling
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Diesel Generator Coupling
Yes I have asked, but no reply yet.
Waross,
That is the interesting aspect to me. The instruction come from coupling OEM, and is identical for both 8 and 9 cylinder engines, which both mate up with identical generators. 11500 kVA, 14 pole.
RE: Diesel Generator Coupling
OR
Someone may have asked:
"What is the proper alignment of the coupling?"
This may have led to a discussion in the offices of the builder somewhat as follows:
"This is the fourth time that someone has asked this. What do we tell them?"
"It is not that important but if we add an instruction to align the north pole with the #1 cylinder they may stop bothering us."
Or there may be some other valid reason.
Bill
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"Why not the best?"
Jimmy Carter
RE: Diesel Generator Coupling
#1. From the engine manufacturer: "Research has shown that the requirements were implemented as an aid in analysis of torsional load optimization of the rotating system."
#2 (to make me go away) "That analysis being complete, the requirement is now unnecessary. The requirement is no
longer needed and can be removed from the drawings." And since we ignored the note in the drawing in the past anyway, the OEM stated "All couplings currently installed do not need to be removed for phasing or marking issues."
That is particularly good news, as when I looked at a rotor yesterday I saw that the keyway is acually between poles, not aligned to a north pole. I am NOT going back to the OEM and tell them that.
Well Done!
RE: Diesel Generator Coupling
Yours
Bill
Bill
--------------------
"Why not the best?"
Jimmy Carter