Ron van Sommeren

About de-rating controllers, starting at 'for everyone else': http://www.rcgroups.com/forums/showthread.php?p=11476940#post11476940   Also check ESC maximum rpm. it depends on #magetpoles.  Number of controller processor computations per revolution goes up with number of magnetpoles, therefore, the higher the number of magnetpoles, the lower the max.rpm. a controller can handle. Table: max. rpm per, make, type, #magnetpoles www.bavaria-direct.co.za -> Motor building info -> ESC max rpm limits, pdf file   ESC information compiled by Christo van der. Merwe from South Africa, user 'skylar' on RCGroups.   Vriendelijke groeten Ron  Edited By Ron van Sommeren on 01/06/2009 22:03:40

Motor current is rather smooth because on the motor side of the controller,  the (motor)induction actually does a good job at removing spikes/pulses.There induction is something good. See this graph: http://www.consult-g2.com/course.html -> www.consult-g2.com -> chapter 9: electronic controllers -> fig 9.2 PWM representation   Vriendelijke groeten Ron

Too long battery wires will kill controller over time, voltage spikes will be higher than battery voltage, bad for components and will give noise interference, input caps will get hot and will explode.Battery wire inductance is the main problem here, and to a much lesser extent,  wire resistance. ALL ESC manufacturers say the same: extend motor wires, not battery wires.   If you cannot but extend battery wires: solutions, rules of thumb,  ESCmanufacturer statements, installation, diy & commercial solutions, tech background info:: http://www.rcgroups.com/forums/showthread.php?t=952523&highlight=kill   @Richard Low ESR-type caps are a must, must, tandard  el-caps will get hot due to I²R losses in caps. High spikey currents in there.   Prettig weekend RonEdited By Ron van Sommeren on 29/05/2009 18:48:20

You are too fast Steve, I had only typed the opening sentence and was looking for the apropriate links   edit: guess it's lunchtime in the UK Edited By Ron van Sommeren on 27/04/2009 12:49:33

"Try a DROP of oil on the bearings ..."   Careful with oil in greased bearings Eric, see posts http://www.rcgroups.com/forums/showthread.php?p=11907250&highlight=oil+oiling#post11907250   and post #15 here http://www.rcgroups.com/forums/showthread.php?t=1012048   Vriendelijke groeten Ron Edited By Ron van Sommeren on 27/04/2009 12:46:22 Edited By Ron van Sommeren on 27/04/2009 12:48:22

One possible explanation: squealing/jerking motors    Prettig weekend Ron

$3 diy wattmeter http://www.rcgroups.com/forums/showthread.php?t=949923   Vriendelijke groeten Ron

Je bent welkom

Automatic wiring diagram 'generator': http://scriptasylum.com/rc_speed/_lipo.html http://scriptasylum.com/rc_speed/_wiring.html Vriendelijke groeten RonEdited By Ron van Sommeren on 21/04/2009 18:40:14

Dutch Graupner/Robbe/Multiplex service has seen many toasted ESC's due to too long battery leads. All ESC manufacturers say the same, extend motor leads, not battery leads. Install extra input capacitors if you must extend battery leads. Statements, solutions, rules ot thumb, installation, explanations: http://www.rcgroups.com/forums/showthread.php?t=952523   Vriendelijke groeten Ron

Ditto

Craig, check the temperature of the large cylindrical input capacitors after 5-10minutes of partial throttle. Not at WOT, because at WOT long battery-ESC wires are not a problem. Explanation in the Long battery wires will kill esc over time discussion. If the ESC manufacturer (Schulze, Castle etc) statements in that post haven't convinced you yet, have a look at post #18 om this thread: http://www.rcuniverse.com/forum/m_8541190/tm.htm   Vriendelijke groeten Ron diy brushless motor building * D-calc e-flight calculator e-fly in, Nijmegen, NL * Xperimental RC planes meeting Edited By Ron van Sommeren on 19/03/2009 20:49:36

At first, Ralph Okon (of transl...www.powercroco.de) amp-abuser and motor-builder per excellence was very sceptical about the new Scorpion make, especially, like me, about the maximum temperature claimed for the magnets. He vented his opinion in a very Teutonic way right between the eyes i.e. Now he's an afficionado (user 'scorpionfan' on RCGroups), he also vented that in a very Teutonic way He uses the Scorpion kits for very high power motors e.g. http://www.rcgroups.com/forums/showthread.php?t=990566   Developments/experiences from him and his Powercroco forum go straight into the Scorpion designs e.g. (see pics below). A 5030 development for F3A pattern planes (remember, you read it here first) transl...www.rc-network.de/forum/showthread.php?t=1388568   There's no commercial relationship between him and Scorpion, Ralph earns his money as a medical doctor.   www.innov8tivedesigns.com sells kit versions, for even better efficiency and power.   Vriendelijke groeten Ron van Sommeren http://home.hetnet.nl/~ronvans/     Edited By Ron van Sommeren on 18/03/2009 18:28:21

About extending motor-ESC wires, that's hardly critical because there's already a lot of wire in the motor itself. If the motor-ESC wire eventually gets too long, it will not harm motor and/or controller. May cause interference though, give the motorwires a twist. Always a good idea to do that anyway.   Vriendelijke groeten Ron http://home.hetnet.nl/~ronvans/

All ESC manufacturers say the same, extend motor leads, not battery leads. Install extra input capacitors if you must extend battery leads. Statements, solutions, rules ot thumb, installation, explanations: http://www.rcgroups.com/forums/showthread.php?t=952523  Vriendelijke groeten Ron

Always disconnect LiPo's after a days flying. Even though motor is turned off, the ESC still draws current. This may ruin you LiPo's.   Vriendelijke groeten, Ron

Before you honour your Philistine inclinations, what Turnigy would that be? Link? Maybe I can give you the number of magnets (probably 14 anyway), without you having to tear it apart.   Careful when sliding the bell back on, very strong magnets, don't let the bell slam home. Bad for your ball bearings. Better use an extra pair of hands.   Vriendelijke groeten Ron

It's the same as for the number of poles for a controller, you have to enter the number of magnetpoles, not the teeth/statorpoles/slots. A magnet passing a coil generates a voltage pulse in that coil. The controller detects and counts those pulses. The number of magnetpoles passing a coil per second is an indication for rpm. If you enter 12, the datalogger divides the number of pulses by 6 to get revs/sec, if you enter 14, the number of pulses gets divided by 7 to get revs/sec. Hence the difference of 15%, it all adds up very nicely If the noise is too bad, just keep on using 12 (or 10) and subtract 15% (or 40%) of the reat out you get.   Some manufacturers (e.g. www.flyware.de & www.rs-e-motoren.de) use tiled/cascaded magnets in their biggies to create one larger single magnet from several smaller ones to get a better fit in the bell. That larger magnet still counts as one magnetpole.   Only for motor-builders/winders is the difference between statorpoles and magnetpoles relevant (it determines the winding diagram), for all other e-flyers poles = magnetpoles.   Vriendelijke groeten Ron   tiled/cascaded magnets from www.solcon.nl/gjkool/  

Yes, two kinds of poles. That's why I also write it in full: magnetpoles, statorpoles. When the polenumber of magnets is mentioned in an ad on a manufacturers site, it always refers to magnetpoles. It is never the number of windings however.   Vriendelijke groeten Ron

Sorry Timbo, not the teeth/slot count but the magnet count is the number of poles. That's the number (some) controllers need to know.   Prettig weekend Ron

It must be a brushless controller, a controller for brushed motors will not do the job at all. Vriendelijke groeten Ron

I can only guess that Scott thinks there are already too many electric flight professionals. Not enough room at the top of the Olympus? Vriendelijke groeten Ron

Very useful FAQs The stickies in the RCGroups power-sytems subforum Understanding Electric Power Systems http://www.rcgroups.com/forums/showthread.php?t=333326 www.ezonemag.com -> FAQ http://www.wattflyer.com/forums/forumdisplay.php?f=3 -> ¨Everything You Wanted To Know About Electric Powered Flight¨ Selecting power system, several links: http://www.wattflyer.com/forums/showthread.php?t=18521 Some electrical knowledge, the basics http://www.ampaviators.com/ -> Beginners guide -> About Ampère and Volt Wiring diagrams: http://scriptasylum.com/rc_speed/_wiring.html Vriendelijke groeten Ron

The floor is all yours Scott, go ahead ... Vriendelijke groeten Ron ps. BTW, what are FAQs?

Controller makes/types and their max.rpm. for given number of magnetpoles: http://www.bavaria-direct.co.za/models/motor_info.htm -> ESC Max. RPM Limits Vriendelijke groeten Ron