Outrunners supported/held by the shaft? - RC-Monster Forums

redshift · 10.07.2009, 06:52 PM

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 · 07:57 PM

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 · 10.07.2009, 07:58 PM

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

zeropointbug · 10.07.2009, 08:03 PM

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 · 10.07.2009, 08:10 PM

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 · 10.07.2009, 08:10 PM

Quote:

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 · 10.07.2009, 08:07 PM

Quote:

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.

sikeston34m · 10.07.2009, 08:26 PM

Quote:

Originally Posted by redshift

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.

Make me an offer via pm if you're interested. I like to trade as I am in the market for several items of interest.

The motor shown is my own custom wind. If you prefer a factory wind in the 4120 series or the 4130 series, I'm sure I have that on hand as well. In fact, I believe I still have all the custom mounting hardware for the Direct Drive to Diff Revo Conversion.

This offer isn't exclusive to Redshift, but he has first dibs. Must be a reputable RCM Member.

Sorry ZPB, not trying to highjack your thread. I thought you might have interest in this as well. Since it is custom stuff that pertains to what you're doing.

PM only on this please.