Understanding the Winding and Voltages of an AC Generator: A Hyundai Unit

[Shane Kennedy]

Hi. Can anyone tell me how my AC generator is constructed. It is a Hyundai unit, the main windings consist of 4 wires in parallel, 2 sets of 6 coils, each one of the set is maybe 8 or 10 turns. There is a secondary pair of 2 windings each. This is centre-tapped, so I guess to provide exciter power for the AVR through an internal half-bridge rectifier. There is also a single conductor wound along with the exciter coils, I think to provide charging for a 12V battery. Then there is another single conductor winding which I believe to be the sense winding.
Can anyone provide a winding diagram, or even the voltages which would be expected on the exciter and sense windings. I am sure that the total turns for the main windings are standard, but If someone could indicate how many, that would be appreciated too.

Thanks in advance.
Shane

 

[Baluncore]

What is the model number? Is it 3 phase? What is the kW rating?
What is voltage selection available? Is there an external voltage regulator?
Does it have slip rings, or is it a marine alternator with a rotating transformer and 3PH bridge rectifier to control and power the rotating field?
Does the stator have two windings per phase making 6 windings so it can be linked for 115V in parallel or 230V in series, or configured as a delta or a star?

 

[Shane Kennedy]

GA70, single phase, Peak 6.3kVA, 115/230V, electronic AVR bolted on, slip rings, 2 windings, each spaced over 6 slots.

The engine that I will be driving it from has it's own small alternator, so I could use that to provide the exciter power, and I could use an ordinary transformer on the mains output of the big generator for feedback/regulation ... if I knew what voltages were required.

Thanks

 

[Baluncore]

Seems like GA70 is not a Hyundai AC generator model number. Maybe that is a marketing badge describing a Gasoline AC generator, peak output 7kW.
It might be a unit from the Hyundai HY7000 series. Examine the generator for a manufacturers model and serial number plate. Can you estimate the year of manufacture? Is there a picture of the unit on the web?

 

[Shane Kennedy]

 

[Tom.G]

The label indicates it may have been marketed in Great Britain... and, pure speculation here, the Q.C. sticker could indicate a date of 1965, or maybe it shows Inspector No. 65 and Serial No, or...
I suggest you try contacting Hyundai in Great Britain. Their current 6kW generators are shown at: https://hyundaipowerequipment.co.uk/catalogsearch/result/?q=6kw

Good Luck! And let us know what you find.

 

[Baluncore]

I agree, it is pre-internet.
I emailed the technical people at genpower in the uk earlier asking for wiring / service info.

 

[Baluncore]

I received a reply. We need the model of the engine - generator combination, rather than the alternator alone.
“Thank you for the email on the machine the generator should have a model on it it will have something like DHY at the start or EVO followed by a number can you please send that across and i can get the the correct diagram for that machine.”

 

[jim hardy]

see if the drawings about page 49 here
http://www.hyundaipower.ca/manuals/3500-English-Manual.pdf

have at least a family resemblance.

old jim

 

[Shane Kennedy]

I tried Hyundai UK, and was simply told "we don't have winding diagrams". I separated the alternator from the engine some time ago, and have disposed of the rest of it as u/s.