The total current will go thru the motor. you mean per phase? I guess that would depend on the poles of the rotor..
I heard something about the Y and D winded Neu motors, what i heard is that the differences are not noticeable
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it's just easier to wind and compress that way, and probably more durable during compression.
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well, the main reason is that thick round wires leave an awful lot of space (air) between the different wires. this would result in a less efficient motor.
That's the main reason. the fact that it's easier put in place (more flexible) is a nice feature that comes with it.
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Do you know how many 'separate' wires there are?
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no, you can't tell. That depends on the current the motor needs to take, and the amount of winds it has. The less winds (higher KV), the more wires 1 phase will be made of.
The more winds a motor has, the thinner the input wires are. (and this is possible, because the motor is made for a higher voltage, so the current going thru it will be lower as well. (proportionally the other way around to reach the same power)