Outrunners supported/held by the shaft?

[sikeston34m]

Originally Posted by redshift

That question is better left to the OR experts.

Sikeston..... I see you

LOL

I was processing.

[sikeston34m]

Take a look at the 3032 Scorpion Motors on the website.

Here's talk about the bearing. Without something like this, you will have problems with flexing.

"The new version 3032 motors now have an extra ring bearing to support the back end of the rotor can for rock-solid stability. This prevents the shaft from flexing under load, and maintains the airgap between the stator and the magnets under all operating conditions."

If the Shaft will flex on longer endbells, your diff cup WILL flex for sure.

[sikeston34m]

This is do-able for sure as long as you consider gear ratios and roll out in your setup.

By connecting the endbell to the diff, you're adding a flex point.

You can get by with this, as long as you use a motor with the endbell bearing. It's a press fit, but will prevent the magnets from contacting the stator during hard acceleration or braking.

Does your motor have the larger press fit endbell bearing?

[redshift]

Are they all about the same construction Sikes? I know the larger ones use the rotor face instead of the shaft for drive connection, but the guts are the same-ish yes?

[sikeston34m]

Originally Posted by redshift

Are they all about the same construction Sikes? I know the larger ones use the rotor face instead of the shaft for drive connection, but the guts are the same-ish yes?

Yes, most are the same. Also, most outrunners can drive a prop from either end. By either using a collet on the mount side, or by mounting directly to the rotating endbell.

[redshift]

Ok, yeah the outer mounting holes are obviously used in very hi torque apps, and gives you lots of options, outrunners really are the shiz.

And I know the most common use for driving from the stator end is helis, but works great also for like what you did with your outrunner topshaft transmission (really liked that one as well as your DD Revo )

[sikeston34m]

Originally Posted by redshift

Ok, yeah the outer mounting holes are obviously used in very hi torque apps, and gives you lots of options, outrunners really are the shiz.

And I know the most common use for driving from the stator end is helis, but works great also for like what you did with your outrunner topshaft transmission (really liked that one as well as your DD Revo )

Thank you.

I have one of these that I want to do a HV E Revo with, but am waiting on Castle to release a good HV ESC.

8 Pole Heli Motor good for 10S Lipo

http://www.centuryheli.com/products/...&currentid=345

Gear it to the moon.

[What's_nitro?]

This is what I meant...

I hope I didn't butcher it too much!

[redshift]

I'm really liking what I see, but my first thought was that this would be more feasible with a fifth scale. The size to weight ratio would seem to work more in your favor, at least with the motor choices currently available. I had the same idea actually ZP (sorry) but I was thinking about just going live axle, no diff.

Sikes the cogging issue is not what it was one or two years ago, correct? I know the startup algorithms have been improved quite a bit.

And "8 Pole Heli Motor good for 10S Lipo" I gotta say yikes... sikes!

I know you can pull it off...

[zeropointbug]

What's Nitro, I know what you are saying with the support bearing there, but where do you get bearing that size? I have never seen any such bearing.

Sike, I have not bought the motor yet, as I was unsure of which one to get, the HK, or the S model 4035. This flex issue really bothers me as well.



The perfect solution would be a high pole inrunner (12 pole or more), with a large hollow shaft with some sort of outer spline on it to connect to a gearbox (center diff), and one of the output shafts feed through the motor like this. That way, there is no flex issues, you have the cooling of an OUTER stator, the efficiency of an inrunner, and the the motor can be sealed. That is what I would like to see in R/C in the near future... no worrying about gear meshing either.

It's nice to see so much enthusiasm for this.

redshift, I don't understand what you mean by your idea of 'live axle' and no diff. If you mean just an outrunner in the place of a standard motor/diff, then that has been done before. I think the first time when I had the outrunner idea was back in '05 or something, and I was thinking one motor per wheel, no diffs at all, just 2 smaller outrunners placed at each differential location front and rear. THAT would be the ultimate, but we are years away from that kind of thing.

[zeropointbug]

redshift, do you mean an outrunner at the rear axle, in place of the diff?

[zeropointbug]

Hey Sike I just checked out that century outrunner... YIKES is what I have to say as well. I can't see it holding 30krpm though, that just seems like too much, and it doesn't state how many poles there are.

[zeropointbug]

okay, beauty WN (can I call you that?) I figure if it's not the exact size, you can always make an insert for it to fit...

A question for everyone, does Neu have an 8mm shaft high pole motor that could have the shaft hollowed out for the same thing?

[sikeston34m]

Originally Posted by zeropointbug

Hey Sike I just checked out that century outrunner... YIKES is what I have to say as well. I can't see it holding 30krpm though, that just seems like too much, and it doesn't state how many poles there are.

There are several places that comfirm it being 8 pole.

Here's one source that you may find useful with other things:

http://www.progressiverc.com/Brushless_Motor.html

It has 10 Magnets inside the rotating endbell instead of the conventional 14 as with a 12 pole outrunner. So it's a different "8 pole" wind also.

[redshift]

Originally Posted by zeropointbug

redshift, do you mean an outrunner at the rear axle, in place of the diff?

Yeah, I got the 2 ideas going at once, sorry. And I know the outrunners don't have the nut for that.... yet.

But it seems like if it was to be tried it would work better on a 1/5. I don't think we're quite there yet. I also am tossing around doing either a single outrunner solid center like sike's, or a twin inline setup.