Yea, I agree that the bell length grows dramatically and that you would
want to support the end with a bearing, i.e. a motor sandwich, one plate for the
mount, the other plate for the end bearing.
The back to back counter rotating versions could be a bit easier in that sense.
The nice thing is that when you mount the firewall side of each motor
to the center mounting plate...the bearings are well supported
and you don't have this big cantilevered bearing load like you mentioned...
And instead of bearings on the end of the front motor bell in the counter rotating
example, you can just secure the shaft to the end of the bell with set screws and
flat spots or pin it. This would tie to the two motors together...
Another variation would be to couple the end bells together with cooling holes...
If you had a motor sandwich with two end plates, the firewall side of each motor
could be mounted to each end plate. Then the shaft would be supported without
addiotional bearings.... Cooling would be the biggest challenge.
But you would still need an outer support bearing when it comes time to take
power out of the assembly.....so...no free rides eh?
But the stators would be independent, and you would need two controllers...
no biggie...but more complex...
The biggest reason to do a double stator is just to knock the Kv down, well and the other good
I just picked up a small mill/lathe benchtop combination machine with two motors, one for the mill and
the other for the lathe.... an old Shop Task unit.
I've been building a heavy duty bench for it out of some assorted 4x4 timbers, tongue and groove frame, and a maple top....I can't wait!!!
So, now, I just have to pick something and do it...!
Back to Back?
End to End?
"If you don't follow your dreams, you might as well be a vegetable." Burt Munro
The reasonable man adapts himself to the world;
the unreasonable one persists in trying to adapt the world to himself.
Therefore all progress depends on the unreasonable man.
-- George Bernard Shaw