3 years ago
3 years ago
google brushless alternator
Not my problem. You're the one who doesn't know the answer, not me.
I know the answer now, you still don't.
Mate, I DESIGN brushless alternators for part of my JOB.
Then be so kind and answer are the stator coils smaller than rotor coils to minimize losses or is there some other reason?
I humbly suggest you blew your chance of a response with your rather rude attitude.
Lol, i wasn't rude. As you wish, i'll assume it's to reduce losses.
Ah a matter of opinion.
As I said thicker wire greater currant.
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.
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.
Josehp, one additional question, why does it seem to be more than 6 stator coils in the photo above?
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.
Josehf, thank you for the answer. I know that 3 phase alternators are up to 50% more effiecient than single phase.
no you didn't you asked why are they bigger.
LOL, are you analfabetic or something? Read the question.
"Why are brushless alternator main rotor coils much bigger than stator coil" !
Lol, if rotor coils are bigger (4 in the pic), it necessarily implies there is more stator coils (20+ in the pic).
Thicker wire = greater current carrying capacity.
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.
Maybe this will help?Wikipedia is always good and they can use some donations too ;)