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.

[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

[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.

[macr0w]

Originally Posted by fkadir

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

Is yours a Neu or a Tekno Neu?

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?

[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

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

[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.

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.

i can turn mine by hand as well, and the other day on the track it got up to 175*,which is far hotter then most of the others running original neus, but i think that after 20 min. of running that is acceptable, so what ever the changes are from the original ones it is still worth the praises, great motors imo, but i have never ran a original version

Guys,Thank you all.
I got reply from Tekno RC. They told me this is the new design to reduce cogging.
The performance will be the same.The rotor/stator design is a little different to reduce cogging. All of the newest Neu motors are like this.
Anyone notices the improvement of cogging in these new design motors?

[phatmonk]

Originally Posted by Gallagher

Guys,Thank you all.
I got reply from Tekno RC. They told me this is the new design to reduce cogging.
The performance will be the same.The rotor/stator design is a little different to reduce cogging. All of the newest Neu motors are like this.
Anyone notices the improvement of cogging in these new design motors?

Now that you mention that yes its very smooth.But it does seem to run hotter temp wise.