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Why are brushless alternator main rotor coils much bigger than stator coils? Answered

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steveastroukniksa21485

Answer 2 years ago

Not my problem. You're the one who doesn't know the answer, not me.

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steveastroukniksa21485

Answer 2 years ago

Mate, I DESIGN brushless alternators for part of my JOB.

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niksa21485steveastrouk

Answer 2 years ago

Then be so kind and answer are the stator coils smaller than rotor coils to minimize losses or is there some other reason?

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rickharrisniksa21485

Answer 2 years ago

I humbly suggest you blew your chance of a response with your rather rude attitude.

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niksa21485rickharris

Answer 2 years ago

Lol, i wasn't rude. As you wish, i'll assume it's to reduce losses.

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rickharrisniksa21485

Answer 2 years ago

Ah a matter of opinion.

As I said thicker wire greater currant.

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niksa21485rickharris

Answer 2 years ago

We all know thicker wire carries greater current but that is not an answer to my question. I asked why are there more stator coils than rotor coils, unlike the classical alternator. The asnwer is that the one in the picture is a three-phase brushless alternator.

24kw_AC_Synchronous_Alternators_3800_5.jpg
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Josehf Murchisonniksa21485

Answer 2 years ago

Alternators are made with three phase stators to prevent load pulse. If they were made single phase the armature would go from no load to full load to no load as it spins. With three phase there is very little change in load.

However magnets come in two poles North and South, they use two coils instead of one to balance the armature and to keep it from vibrating. This also enables the armature to come in 2, 4, 6, and more poles.

The stator's winding's are in 3 phase construction for constant load.

So the coils will be 2 on the armature 3 on the stator.

North and South.

Or the coils will be 4 on the armature 6 on the stator.

North, South, North, and South.

Or the coils will be 6 on the armature 9 on the stator and so on.

North, South, North, South, North, and South.

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niksa21485Josehf Murchison

Answer 2 years ago

Josehp, one additional question, why does it seem to be more than 6 stator coils in the photo above?

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Josehf Murchisonniksa21485

Answer 2 years ago

It has about 18 coils in 6 stars.

It is called a delta star configuration. This is a single star configuration, that alternator would have 6 of these in parallel giving it a smooth load and greater current.

Axial Generator c.png
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niksa21485Josehf Murchison

Answer 2 years ago

Josehf, thank you for the answer. I know that 3 phase alternators are up to 50% more effiecient than single phase.

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niksa21485rickharris

Answer 2 years ago

LOL, are you analfabetic or something? Read the question.

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rickharrisniksa21485

Answer 2 years ago

"Why are brushless alternator main rotor coils much bigger than stator coil" !

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niksa21485rickharris

Answer 2 years ago

Lol, if rotor coils are bigger (4 in the pic), it necessarily implies there is more stator coils (20+ in the pic).

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rickharris

2 years ago

Thicker wire = greater current carrying capacity.

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niksa21485

2 years ago

iceng, what are you talking about, have you ever seen inside of an brushless alternator? If no then google it, it usually has 2 or 4 huge main rotor coils and 20+ small stator coils.

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Downunder35m

2 years ago

Maybe this will help?
Wikipedia is always good and they can use some donations too ;)