Neu motors

[glassdoctor]

Are they that big??? :) oops I should look closer huh? I must have some big arse 12ga cause they look kinda thin... ha ha

[BrianG]

All wire has resistance. The shorter and/or smaller lengths have less. The shorter you have the wire, the smaller gauge it can be. If the wires needed to be like 10 feet long, we'd have to use 4 gauge for ~75A! Using smaller than recommended will just create more voltage drop and heat for any given length.

[Serum]

That's not overkill glass, if 12GA wire gets hot already, it's not overkill to use it. with that in mind, 14ga is too small.

[glassdoctor]

ok...14 is bad. that make me feel better. :) I think I was forgetting how small 14ga is... and assumed the MM smaller wire was 14. At any rate, Castle says there is no way those wires are an issue... that they are more than capable for what the systems can sdish out.

who gets 12 ga 1400 strand wire hot???

[Serum]

Yeah, they do use 12ga for the battery leads.. And a 1/10th setup is less current hungry than a 1/8th monstertruck

[aqwut]

I like deans wet noodle 12 gauge they work pretty good.... but they're are they a little bit thicker then deans utra 12 gauge. I try to use 10 gauge for everything.... I don't like it either when batteries comes with 14 gauge wires.. it just looks funny...

Originally Posted by cart213

What's with the Y and D designations on the motors? Does that signify the type of wind, and does one type have an advantage over the other?

I don't know if this was answered or not, but I just figured out what it means myself. Y = Wye wound and D= Delta wound. It also looks like Wye wind can handle more voltage.

[jhautz]

Originally Posted by Cartwheels

I don't know if this was answered or not, but I just figured out what it means myself. Y = Wye wound and D= Delta wound. It also looks like Wye wind can handle more voltage.

Whats the diference between a Y wind and a D wind? Is one better, or just diferent ways of acomplishing the same thing?

[BrianG]

Delta wind looks like a triangle. Each end of the coil is a point on the triangle with each coil as one of the sides. Wye wind looks like the letter Y with one end of the coil at each end point of the Y, the other end of all three coils are tied together at the junction of the Y. The coils make up the "legs".

Generally, the Y wind is used in 3-phase industrial AC because there is a common neutral lead. This creates the 120v from each lead to this common point and each is 120 degrees out of phase from each other. Obviously, this requires four wires (one of each point and the neutral). Delta is used to transmit high voltage AC across long distances on the high tension power lines. There is no need for a neutral or common lead here. The biggest advantage is that it requires one less wire so it saves money on the physical wiring. Ever notice how those high tension wires are in three? That's why (or should I say "not wye", lol ...I know, bad pun).

If our BL motors are wired in Y configuration, the center point isn't a lead, it's just a common point in the motor. Only the ends of the Y are hooked to the motor leads. However, the signal has to go through two coils instead of just one. This increases the resistance, reduces the current, and splits the voltage. So more voltage can be used. The signal going to a delta-wired motor goes through only one coil at once (less resistance/more current/less voltage is needed). Actually, it's a little more complex than this because of the 60 degree out of phase thing, but that's a basic example.

[edited for error]

[jhautz]

Wow... I think I get it. Anyone got a link that I can read about this more in depth?

[BrianG]

Here is a decent write-up...

[glassdoctor]

I think what BG is trying to say is ummm... there are two ways (in this case) to skin a cat. :D

The reason they have motors in both delta and wye styles is simply to get more variety in kv ratings.... a wider range of #'s. There is already a big jump between some kv ratings even with both styles of wind. Such as the gap from the 2.5D 1700kv.... to the 1Y 2200kv in the 1515 line. If they only offered Y or D then this gap would be wider yet.

FYI... Some have claimed one or the other to be a superior method, but according to the Neu distributor, both styles are equal... they say one is not "better" than the other. So it doesn't matter which style you get. Just pick the kv you want.

[Serum]

Sounds like delta could have the potential to produce a bit more torque.?

[glassdoctor]

Just a note that I tweaked the truggy a bit and did another quick midnight test run... trying not to annoy the nieghbors too much.

I'm guessing the top speed is kinda slow (I will check that tomorrow) but geeze this thing has serious torque. (Neu 1512 1900kv) Truggies are not supposed to pull wheelies are they???? :D

This may need a new thread... but part of the magic I think is the new lipo packs I soldered up today, using maxamps 4000 cells. I have a 4s 12000mah setup in it and it's incredible.

Pulling wheelies is getting +100A spikes and the voltage (fresh off the charger) was holding over 3.7v per cell. Lowest voltage recorded in the two minutes zipping around was 14.9v on a 107amp spike.

I think I will try making my 6000 packs into some 9000s and I may have to retract somewhat what I have said about lipo packs. eg lower rated cells are fine if you run a large pack... that you don't need to buy the latest and greatest 20C cells etc.

This is still true, imho.... however after seeing the punch this huge pack delivers I wonder if the TRUE 15-20c cells could have a bigger performance edge that I thought over the good value 10C type cells, if the size of the packs are similar.

Some aspects like top speed I doubt are affected much, but holeshot is very impressive with the near-zero voltage drop.

Anyway I will run this thing tomorrow and see what it can do.

[GriffinRU]

Originally Posted by Serum

Sounds like delta could have the potential to produce a bit more torque.?

It is hard to say, depends on motor, application and controller (true AC or mod. AC).

Check discussion here

In some cases in Delta is harder for sensoreless ESC to identify rotor position then in Star.

Artur