Why the half turn?

[micro racer]

I know this isn't really a tech question, but why do brushless motors end in half turns and brushed motors end on whole numbers? You know, 17.5t brushless or 27t brushed? I was thinking about this earlier and I just thought it was weird.

[Duuuuuuuude]

Brushed motor windings begin and end at the same end of the armature so you get full turns. Brushless motors with windings around a stator begin and end at opposite ends.

Some brushless motors do not have stators and are simply "packed" and will have full turns.

[stelerzman]

Best answer ever award

Thanks Duuuuuuude.

[Duuuuuuuude]

Hooray! I'm contributing to society!

[micro racer]

Thanks for contributing Duuuuuuuude! I get it now!

[Olle P]

Originally Posted by micro racer

I know this isn't really a tech question, but ...

... I want do have it technical!

Originally Posted by Duuuuuuuude

Brushed motor windings begin and end at the same end of the armature so you get full turns. ...

Obviously for reason of simplicity. Look at the armature and you'll notice that full turns is pretty much the only option.

Originally Posted by Duuuuuuuude

Brushless motors with windings around a stator begin and end at opposite ends.

I suppose this has to do with the motor using Y type winding, where all leads come together at the "far" end (as seen from the end where the cables exit the can)?
I see neither decisive technical advantage nor disadvantage of that solution compared to having the Y at the "near" side, resulting in full turns, so why use "half" turns as the norm?

Originally Posted by Duuuuuuuude

Some brushless motors do not have stators...

I think you confuse "stator" with "core". All motors have some part static...

[EddieO]

Basically what duude said....though there are some brushless that were wound as full turns, but they are not very common and harder to produce.

Techincally a hemi wound brushed motor is a half a wind short, but nobody ever called them that...why they did it with brushless, I have no clue...

Later EddieO

[EddieO]

Originally Posted by Olle P

... I want do have it technical!
Obviously for reason of simplicity. Look at the armature and you'll notice that full turns is pretty much the only option.

I suppose this has to do with the motor using Y type winding, where all leads come together at the "far" end (as seen from the end where the cables exit the can)?
I see neither decisive technical advantage nor disadvantage of that solution compared to having the Y at the "near" side, resulting in full turns, so why use "half" turns as the norm?

I think you confuse "stator" with "core". All motors have some part static...

A Y wound inrunner is MUCH easier to wind and terminate at opposite ends, along with being cheaper to produce.....the half wind stuff is slightly more powerful...

On a brushed....a crosswrapped arms use full turns, a hemi wound has techincally about a half less of a wind because of how its wound...

Later EddieO

[DrewHammer]

It's significantly easier to terminate the windings when the terminations are on opposite ends. It doesn't really matter if its delta or wye wound, the problem is with how compact a 500 series motor needs to be with our application and the lack of space inside both end bells for the winding terminations.

[EddieO]

I am not sure which yer referring to, but a brushed delta would NOT be easier at opposite ends....I can't even think of a way that would work on a brushed motor. A delta brushless inrunner as well would be way harder to terminate at opposite ends. Other brushless designs maybe, but I don't pay much attention to inrunners...though I can't see it being easier as well.

Later EddieO