Turnigy sync issues

[recumpence]

Hey Guys,

I wanted to let you guys know I have had a number of PMs and there have been a few posts about the big Turnigy motors having sync issues. Also, I have run across more than a few people who have been blowing controllers running these motors.

I am starting this thread to see if there is a remedy for this. I have never had a sync issue with an Astro. But, they are expensive motors. These Turnigy motors are so reasonably priced, I think it is a good idea to try to figure this out.

I know my AXI outrunner had bad sync issues. That was a funky 14 pole motor, however, and was known in the RC industry as having this problem. The Turnigy's are 12 pole. Astros are 8 pole. I do not think the higher pole count is the problem per-se. Heck, my Plettenberg is 20 poles and it syncs just fine! I had it not sync once pulling huge amps at very low RPM. But, aside from that, it has been fine.

Does anyone have any ideas on this Turnigy sync issue? I think whatever is causing the sync issues is also causing them to blow controllers a bit easier than other motors.

Thoughts?

Matt

 

[Thud]

Correction Matt.
The Turnigy's are 14 pole also.(magnets) (All sizes, 50,63 & 80mm)
12 teeth stators.
I have taken apart several & all were wound in DLRK & terminated delta. from 50mm thru 80mm can sizes.
straight copys of the AXI motors from my observation.

Just starting out on the right foot here.

I have serched the RC forums looking for data, compairing the DLRK to a standard 3 phase wind with all senario's being equil. The empirical info is not there that I can find. Some one allways has a parameter askew to support their "new" & "Better" set up.
Nothing that I would call apples to apples.

The Astro's all look like standard 3 phase/lap winding from the photos I have seen. I wonder if there is any other forces in play beyond the pole count affecting these issues.

I would love to see proof if the MOJO of LRK is really to our benift on the outrunners.
& hear about all the + & - of either winding senario.

maybe this should be in the motor section?

 

[johnrobholmes]

Throwing one up on a scope would get us an idea if the construction is tight. Could be variations in the magnet placement along with a low phase resistance.

 

[liveforphysics]

The phase resistance on the big HXT motors makes them like trying to drive 3-4 of the typical astro winds all in parallel.

The reduced inductance makes it even tougher for the controler to get a clean BEMF signal to read.

My CC controllers blew on the big HXT in about 1minute, just like all the other RC controllers, but they performed great for that minute.

Anyone trying to use the 180kv version over the 130kv version is going to have just about twice the problems, its a couple less turns, with much fatter wire.

 

[Thud]

I am re-reading some of Axels experiments using multiple controllers on a single motor.....

Any one care to theroize the probable outcome of such a set up on a standard outrunner?
I am thinking of grabbing some cheap mystery controllers off e-bay & expiromenting with the 80mm motor I intend to re-wind for Bubba.
That is 4 controllers running single coils for each phase.
Just wondering if the multi controllers would share the burden better than a 2-motor & controller set up.

 

[johnrobholmes]

Multi controllers would share the burden better, but if one ESC gets out of sync it is a goner with the others still pushing the motor around.

 

[liveforphysics]

Make sure you get a whole lot of turns on each tooth. If you were 4 teeth each wrapped with 5 turns before, and you want to run 4 esc's on each single tooth set, make sure you get at least 10-20 turns on that tooth, or you will end up with the same problem as before, just with all 4 esc's blowing up at once rather than just one. Lol

I am re-reading some of Axels experiments using multiple controllers on a single motor.....

Any one care to theroize the probable outcome of such a set up on a standard outrunner?
I am thinking of grabbing some cheap mystery controllers off e-bay & expiromenting with the 80mm motor I intend to re-wind for Bubba.
That is 4 controllers running single coils for each phase.
Just wondering if the multi controllers would share the burden better than a 2-motor & controller set up.

 

[swbluto]

Just want to let everyone know, I haven't had any sync issues with my 63-74 200 kV HXT/Turnigy motor and my Phoenix controller.