Magnetic strength of Neu motor

[rabosi]

My neu motor (not teckno) also runs hotter than i expected. I wonder if the cogging was that bad in the older design to justify the hotter running of the new design. Anyone have experience with both types?

I was told from Tekno that the hotter temperature could be the consquence of enclosed front and rear end or the gearing problem. There should not be any difference of performance in both designs.
Nevertheless, I think maybe desing is one thing; reality is another.
If this is really trend of new Neu motor, I would be very curious about how the new rotor and stator design look like?

Originally Posted by macr0w

Is yours a Neu or a Tekno Neu?

Mine's an older-version Neu. Apparently the newest motors from Neu have a new design to minimise cogging. :)

[zeropointbug]

'new design to minimize cogging' .... What the #$!@ could they have done differently to reduce cogging?! This is almost entirely up to controller design, not so much motor... but, who knows. What cogging has to be reduced anyhow? My Neu (1512) hardly ever cogs.

[lincpimp]

I have a 1515 1.5d, and was also supprised to see that it turned over easily by hand without a pinion. I am not sure how old it is, as I bought it used. I do have a medusa v2 motor, which is supposedly a neu clone. The shaft is much harder to turn than the neu.

I can still feel the magnet poles on my neu, it does not spin as easily as a hacker of feigao.

[What's_nitro?]

Originally Posted by zeropointbug

'new design to minimize cogging' .... What the #$!@ could they have done differently to reduce cogging?! This is almost entirely up to controller design, not so much motor... but, who knows. What cogging has to be reduced anyhow? My Neu (1512) hardly ever cogs.

Maybe, instead of having the stator slots be parallel to the rotor poles, they twisted the stator into a sort of helix so that the rotor's poles are always engaged to more than one "slot". Thus making it fell smoother since the poles aren't "jumping" between slots.

[zeropointbug]

That would be a slotless design...

[What's_nitro?]

I'll give you semi-slotless. Slotless motors have no laminations in the stator.

[zeropointbug]

There are varying degrees of slotless as well...

[zeropointbug]

Yeah, I'm 1 min too late bro....

[johnrobholmes]

My vote would be that the stator is skewed as well. Magnetic detents (cogging as you are calling it) are determined by the magnetic pole/ stator count ratio as well as the magnet strength and motor design. I doubt that Neu went slotless, so the most likely choice is that they skewed the stator laminations. It shouldn't actually effect the efficiency, but it will make the motor roll easier and put less vibration through the vehicle.

[rabosi]

Originally Posted by MacII

I'm pretty sure I read somewhere that this was an intentional design change. I think it may help the motor's ability to coast in neutral as opposed to effectively brake in neutral. Not sure however so I'd suggest you check with Tekno.

Cogging may be the wrong term to use here. The above quote is probably the issue.

[nl12]

I hope this is a genuine improvement, not a compromise to help people run lower quality controlers.

[lutach]

Maybe they just went to a different diameter rotor to give it a little more airgap.

[phatmonk]

I have the original Neu 1515/1.5d and the Tekno Neu 1515/1.5d and the original does seem to run cooler.