Originally Posted by Smoothcruizer3
not bad for 4s and 750kv... I love learning about motor windings... --- kyleservicetech --- could you answer this bugging question in my mind
I always wonder the pluses and minus of wire gauge in a winding, the way it is delta or the other, and if the magnet strength have any effect? --- Scott
It's not so much the wire gauge, as it is filling completely the steel slots for the windings. The motor manufacturers often use multiple strands for each "Conductor". The reason is, even though a single strand could wind up with more "Copper" in each steel slot, you can't bend a single large strand of wire around the corners, without the varnish flaking off.
Some of the real cheap motors don't fill the steel slots, because that takes time, and time is money. Those motors can have lower efficiencies because of that.
As for delta or wye, either works well, and three phase power transformers can be wound either way. Most commercial three phase motors are wound in delta. And most of the model bushless motors I've run across are wound in wye. Which is better? It really does not matter, because going from delta to wye in a given KV rating simply requires the use of different gauge, and different number of turns in each magnetic slot.
As for magnets, the reason our brushless motors have the power they do is because of the very powerful magnets used. The higher the magnetic strength of the magnet, the less turns of magnet wire you need for a given KV rating. Less turns means you can use heavier gauge wire, making it possible to run even more current through it.
Using those ferrite magnets in our high powered motors would not work out well. The magnetic field of a motor pulling 50 Amps plus would demagnetize those ferrite magnets.