PDA

View Full Version : Twin Brushless Motors on the Same Shaft


z-8
10-30-2010, 08:12 AM
Any reason this wouldn't work?

mesh
10-30-2010, 10:08 AM
Hmm, I think it will probably work. If connected to separate ESCs they will be forcibly synced to each other, so it all depends on the algorithms the ESCs use to determine rotation and firing.

If you are connecting them to the same ESC, alignment will be critical, so that the stators and bells are in exactly the same orientation. You are likely to lose some efficiency because alignment is hard.
In addition, one one ESC, you probably have to mount them bell-stator-bell-stator if you try to line up the bells. Mounting one bell reversed might mean that the magnets should not be lined up with each other, but offset. I don't know, but it seems like something to think about.

rcers
10-30-2010, 12:12 PM
You bet it works....

Here is the dual AXI:
http://www.hobby-lobby.com/axi_gold_5330_20_double_outrunner_motor_3048_prd1. htm

Mike

z-8
10-30-2010, 04:24 PM
You bet it works....

Here is the dual AXI:
http://www.hobby-lobby.com/axi_gold_5330_20_double_outrunner_motor_3048_prd1. htm

Mike

Cool, I hadn't thought of making an O-2 Skymaster out of it unitl reading their idea. Seems like a great config for a long nose war bird, plus you get a forgiving single engine config.

I think I have to try this.

z-8
10-30-2010, 04:26 PM
Hmm, I think it will probably work. If connected to separate ESCs they will be forcibly synced to each other, so it all depends on the algorithms the ESCs use to determine rotation and firing.

If you are connecting them to the same ESC, alignment will be critical, so that the stators and bells are in exactly the same orientation. You are likely to lose some efficiency because alignment is hard.
In addition, one one ESC, you probably have to mount them bell-stator-bell-stator if you try to line up the bells. Mounting one bell reversed might mean that the magnets should not be lined up with each other, but offset. I don't know, but it seems like something to think about.

Hadn't thought about two ESCs. Might work with a Y connector? Then you'd lose the potential weight and $ savings of having only one, but it would have to be bigger anyway. With 2 you'd have redundant reciever power too.

kyleservicetech
10-30-2010, 04:39 PM
You bet it works....

Here is the dual AXI:
http://www.hobby-lobby.com/axi_gold_5330_20_double_outrunner_motor_3048_prd1. htm

Mike

Or, one Hacker A80 - XXX or similar motor :D

kyleservicetech
10-30-2010, 04:43 PM
Any reason this wouldn't work?

Some years ago, I put together two www.Gobrushless.com (http://www.Gobrushless.com) "triple" motors with their windings wired in parallel. They were installed on a model airplane, and powered with a single 8 cell RC 2400 Nicad pack. ESC was just ONE CC ESC. It worked, the motors stayed exactly synced.

But, the paralleled motors lost 1000 RPM and 30% power, as compared to a single motor, single ESC. Must have been something involved with the single ESC powering two motors at the same time.

Conclusion, don't do it. :oops:

kenchiroalpha
10-30-2010, 10:37 PM
Hi
Heres a few more
http://www.maxxprod.com/mpi/mpi-266.html
Ive been looking at building one of these aircraft and those contra rotating motors are just the ticket:tc: Hoo Rah:ws:
Do enjoy:D
Spitfire
http://www.youtube.com/watch?v=VZ8BUNJYtOo
"Pecious Metal"
http://www.youtube.com/watch?v=HVWmI1PMUUs
Take care
Hank

rcers
10-30-2010, 10:57 PM
Hadn't thought about two ESCs. Might work with a Y connector? Then you'd lose the potential weight and $ savings of having only one, but it would have to be bigger anyway. With 2 you'd have redundant reciever power too.

2 motors = 2 esc's no way around that...