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ESCs and Temperature Induced Malfunction

Started Jan 15, 2013 0 Replies

I encountered a very interesting problem today and thought I'd share.  To preface, I have a 3DR hexa kit with all the 3DR electronics.  I assembled it Sunday and it was working almost perfectly…Continue

 

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ESCs and Temperature Induced Malfunction

I encountered a very interesting problem today and thought I'd share.  To preface, I have a 3DR hexa kit with all the 3DR electronics.  I assembled it Sunday and it was working almost perfectly yesterday (Monday).  I was having intermittent problems getting all 6 ESCs to arm on power-up, but they would eventually arm after a few power  cycles/bringing the copter inside for a bit to poke at it.  I assumed it was some wonky-ness with the ESCs and put off finding the root cause or a solution until…See More
Jan 15, 2013
George replied to Jonathan Brodie's discussion Arducopter just flips over in stabilize mode
"In a similar vein, are you sure that the motors are connected to the correct channels? i.e. that the position 1 motor both has the correct prop type and spin direction, and is also connected to the #1 output channel on APM?"
Jan 15, 2013
George commented on wayne garris's blog post Techpod - Delay!.. ugh.
"Wayne, I appear to have missed the Kickstarter, but this looks like a fantastic project and exactly the type of thing I've been looking for; a long endurance, efficient plane setup that doesn't cost an arm and a leg or use gas. …"
Jan 9, 2013
George commented on Joshua Ott's blog post Failure is an option
"Ah, that makes a lot more sense, more of a glider than a maple samara (helicopter leaf).  Thanks for the clarification.  Makes a lot more sense now.  As you mentioned, it seems like deployment is the major difficulty so that you…"
Jan 7, 2013
George commented on Joshua Ott's blog post Failure is an option
"While I think that such a system in interesting, they key will be balancing the rotation force (stability/controlability) with the drag force (actually slowing the copter down as opposed to just trading fall speed for rotation speed).  Like the…"
Jan 7, 2013
George commented on Alejandro Martin Pirola's blog post Homemade Steadycam Hexacopter
"Let me know if I understand this correctly.  The system is primarily a mechanical steadycam style motion compensation/smoothing system, but the servos engage and act as dampers to reduce oscillation and alter the "home" position to…"
Jan 6, 2013
George replied to Johann Van Niekerk's discussion APM 2.5 and 3DR power module failure.
"Whether or not you can technically power servos from APM, it's almost always a good idea to power motors and other large loads from a separate, beefier, power rail disctinct from the logic power supply for a few reasons, not least of which is…"
Jan 6, 2013
George replied to Johann Van Niekerk's discussion APM 2.5 and 3DR power module failure.
"It's overly broad and inaccurate to say there;s "NO WAY" for electrical noise to propagate if you use an opto-isolator.  The time varying magnetic flux of the ESC switching can still induce noise on nearby conductors, even if the…"
Jan 6, 2013
George replied to Johann Van Niekerk's discussion APM 2.5 and 3DR power module failure.
"This is the correct answer.  Just to expand a bit, this is due to (I suspect) a combination of the inductive load of the motors + the fact that they just draw current more when moving quickly from one setpoint to a new one as opposed to holding…"
Jan 6, 2013
George replied to Alex Hills's discussion Hexacopter Battery Setup
"I agree completely that it's a best practice to have a high C battery, but I'm still curious if the ESCs are often/ever going above 15A?"
Jan 4, 2013
George replied to Alex Hills's discussion Hexacopter Battery Setup
"The hexacopter kit sold in the DIY Drones store uses 20A ESCs.  That battery would provide over 16A per ESC.  Are the ESCs regularly max'd out such that over 75% of their maximum current isn't enough?"
Jan 4, 2013

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