HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 01, 2010, 11:55 AM
Registered User
Joined Dec 2008
344 Posts
Question
Finding Motor Problem

The trouble is a pulsing motor (like a gas engine cutting out) at almost WOT. Is there a way to determine whether the esc or motor is causing the problem...without having to swap out parts?

thinman
thinman is offline Find More Posts by thinman
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 01, 2010, 12:01 PM
Registered User
So. Cal.
Joined Oct 2004
8,083 Posts
It's likely neither the ESC or motor but rather the battery being unable to hold sufficient voltage under load and the ESC is hitting soft cut.

Can be verified with a wattmeter.

Mark
mrforsyth is online now Find More Posts by mrforsyth
RCG Plus Member
Reply With Quote
Old Jan 01, 2010, 12:03 PM
Check my blog-updated
Mayday!Mayday!'s Avatar
Columbus,Ohio
Joined Nov 2005
2,133 Posts
Could be pulling to many amps. The battery can't hold up. Loose connection, bad solder joints, too small of wires, esc timing, bent shaft. Got to look it all over well.
Mayday!Mayday! is offline Find More Posts by Mayday!Mayday!
Reply With Quote
Old Jan 01, 2010, 04:51 PM
no wings any more, just dust!
Ghost 2501's Avatar
stoke on trent
Joined Oct 2004
8,052 Posts
a few potential candidates rear their head here.

1/ does your antenna pass close to the motor?
2/ are your motor's brushes in good condition and not causing the motor to spark?
3/ are you suppressed sufficiently
4/ vibration causing connections to fail
5/ is the esc's rx lead in good shape, no broken wires, is it plugged in properly at the rx?

my primary suspect would be arcing from the motor affecting the signal if its brushed motor, check where you run the rx antenna
Ghost 2501 is offline Find More Posts by Ghost 2501
Reply With Quote
Old Jan 02, 2010, 12:41 PM
small electrics r BIG FUN
Iowa
Joined Aug 2000
4,317 Posts
I've had a damaged Rx crystal cause strange things after a bad crash. It caused surging throttle, then a snaproll right over my head during a low pass !
Al P is offline Find More Posts by Al P
Reply With Quote
Old Jan 02, 2010, 01:39 PM
Registered User
Letchworth, Great Britain (UK)
Joined Jul 2004
11,586 Posts
Many ESCs pulse the motor when they're approaching lvc, to warn you that it's time to land. As mrforsyth has suggested, battery voltage may be dropping to lvc and thus causing the ESC to go into pulsing mode.

Possible reasons include battery too small for the amps that are being demanded, battery getting too old, or some fault in the power wiring or connectors. A wattmeter will show you how the voltage drops as the amps increase.

What motor/battery/prop are you using?
abenn is online now Find More Posts by abenn
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Need help finding LensRC motor equivalent newguy Power Systems 6 Dec 28, 2009 10:02 PM
Discussion Turnigy Controller Motor Problem helihubi Power Systems 7 Dec 17, 2009 04:10 PM
Discussion Problem finding Plane ProNewb 3D Flying 0 Jan 23, 2007 07:16 PM
Problem finding muffler for ENYA 46-40 dst.clair Engines 1 Feb 23, 2005 10:55 AM