Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
Thread Tools
Old Aug 04, 2004, 02:41 PM
ToddL is offline
Find More Posts by ToddL
Registered User
ToddL's Avatar

2 Brushless motors on one ESC?


I am sure this has been asked before, but I could not locate it in a search.

Could I run 2 CDROM type 10A motors from one PHX 25 controller? If so, I assume the motors would be hooked up identical wires in parallel.
Sign up now
to remove ads between posts
Old Aug 04, 2004, 03:25 PM
Shawn Palmer is offline
Find More Posts by Shawn Palmer
Schumacher USA
Will not work. One ESC per motor in brushless.

Shawn
Old Aug 04, 2004, 04:16 PM
myk is offline
myk
Find More Posts by myk
myk
Registered User
myk's Avatar
Quote:
Originally Posted by Shawn Palmer
Will not work. One ESC per motor in brushless.

Shawn
I think Shawn's answer is the "Right" answer from the Mfg, however the "Real" answer is that it may work and has many times, there are many reports of your setup working on the forums, however you will probably void your warranty in the process.

Mike
Old Aug 04, 2004, 05:56 PM
Shawn Palmer is offline
Find More Posts by Shawn Palmer
Schumacher USA
Well, ok - let me explain in more detail what happens when it does appear to "work"

The controller is looking for back emf from a single motor. When it gets two signals, it averages them together to decide how to run "the one motor" it sees. The result is, since no two motors are electrically and magnetically identical (nor Kv identical) the controller runs neither motor entirely accurately. Innacurate running means extra amps for the same rpms, and extra heat on the motor, and a general degredation of performance compared to a single motor. It also reduces the amp capacity of the controller, due to the extra heat that is generated on the controller itself (I don't know why this is - that's one for Patrick to answer).

Will it harm motors doing it? Will it harm the controller doing it? That depends on how close you are to the amp specs of the motors and controller, how "different" the motors are, and a host of other things, but the very real possibility exists for one or all three to be damaged, where there is none for two single motors and controllers.

Think of it this way - if it was totally OK to run twins on our controllers - we'd be advertising the poopie out of it as an industry leading accomplishment! LOL (only one controller claims that now, and with a lot of specific stipulations). And I only throw that out there to quell the folks that may say "they just want to sell more controllers". Take it from someone who knows better - not a good idea.

Shawn
Old Aug 05, 2004, 12:31 AM
myk is offline
myk
Find More Posts by myk
myk
Registered User
myk's Avatar
Even though you might blow something up, check out these videos, they are awesome, I just might have to try this some day. First is a twin counter rotating CD-Rom by skirtz that is running on a single Phoenix 25

http://skirtz.rchomepage.com/twin01.wmv

Second is also a twin counter rotating CD-Rom by EljimbO that is running on a single Phoenix 10

http://home.comcast.net/~eljimb0//MVC-610W.MPG

Here are the links to the corresponding threads these are from

https://www.rcgroups.com/forums/showthread.php?t=253610

https://www.rcgroups.com/forums/showthread.php?t=246407

Oh and sorry Shawn for endorsing this (well sort of) but it is just too cool even if your controllers don't "officially" do this.

Mike


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion 2 Brushless motors on one ESC! Rwarner1976 Foamies (Kits) 6 Mar 20, 2006 12:57 PM
Question 2 brushless motors on one brushless controller? hawaiianspork226 Power Systems 5 Mar 10, 2005 02:04 AM
can you run 2 brushless motors off of one esc? jeff262 Power Systems 4 May 31, 2004 12:39 AM
Can you run 2 brushless motors off of one ESC nikolaus_c Power Systems 1 Jul 05, 2003 12:44 PM
2 brushless motors on one speedo? juantrinidad Foamies (Kits) 0 Jul 01, 2002 03:23 AM