Magnetic strength of Neu motor

I recently received the Tekno RC edition Neu motor 1515/2.5D/F.
I have found that the shaft can be rotated by fingers easily.
The shaft of my 1515/1Y/F motor is very difficult to rotate by fingers.
How come they has such difference?
I thought 1515/2.5D should come with strong magnet as 1515/1Y does and hence the shaft stays firmly .
Is it normal with the 1515/2.5D?

My 1515/2.5D definately cannot be rotated by hand.

[macr0w]

Originally Posted by fkadir

My 1515/2.5D definately cannot be rotated by hand.

Is yours a Neu or a Tekno Neu?

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.

[crazyjr]

Mine would rotate, but with a good amount if effort with the shaft only. With the pinion, it was easier but you could feel the magnet strength

Originally Posted by crazyjr

Mine would rotate, but with a good amount if effort with the shaft only. With the pinion, it was easier but you could feel the magnet strength

same here with my Neu 1515/2.5d

[xcntrk]

Yep they're tight! I was initially concerned that my rig wouldn't free-roll well when off throttle, but they do roll easier when in the actual model.

FYI.
Mine is form Impakt RC. It is a Tekno edition neu motor.
It is blue-colored, sealed end bell and has shaft with flat area.
I thought they come with the same inside(rotor and winding), and only in different version.
It seems I have a bad one. Maybe I need a replacement.

[rabosi]

I have one of the new neu1515 1y(with 4 screws on end bell) and it is also fairly easy to turn by hand. I was also surprised by this when I got it because based on what I've read I expected it to be harder to rotate by hand. Of course resistance to hand turning is subjective. What one person thinks is easy might be hard for another or maybe something has changed in the design.

May I ask how is the performance of the motor?
If this is normal, why the new Neu motor is made in this way?
Does not less resistance correspond to less magnet field/strength and less motor torque?

[rabosi]

Originally Posted by Gallagher

May I ask how is the performance of the motor?
If this is normal, why the new Neu motor is made in this way?
Does not less resistance correspond to less magnet field/strength and less motor torque?

I don't have a good reference for comparison but when I got the motor I expected it to be more "torquey" than it was. But overall I've been happy with it. It runs cooler than the feigao 7xl I used before. It would be easier for someone who had an older version and a new one to see if there actually was a difference.

[phatmonk]

Originally Posted by Gallagher

I recently received the Tekno RC edition Neu motor 1515/2.5D/F.
I have found that the shaft can be rotated by fingers easily.
The shaft of my 1515/1Y/F motor is very difficult to rotate by fingers.
How come they has such difference?
I thought 1515/2.5D should come with strong magnet as 1515/1Y does and hence the shaft stays firmly .
Is it normal with the 1515/2.5D?

I have a Tekno Neu 1515/1.5d and it does turn easier.As for performance I cant tell the differance