Goedendag ;-) Several (34) online courses from the Massachusetts Institute of Technology o.a.: * Aeronautics and Astronautics * Electrical Engineering and...
Goedendag ;-) Oops, forgot the link ... Several (34) online courses from the Massachusetts Institute of Technology: http://ocw.mit.edu/ Amongst others: *...
Hi, Can anyone tell me why the Evaluation1 (Auswertung1) sheet always has Python 80 - 2S at the top and all of the other Evaluation sheets have the name of the...
Kenneth Myers
kmyersefo@...
Dec 17, 2005 5:57 pm
32
Hi Ken, What version are you running? V22_011 doesn't show this (the version I run). Rod ... has ... have...
Hi Rod, ... That is the version I'm running. I opened an older version V22_010 and Auswertung1 shows 227x82 10Y600 GB as the motor at the top of the ...
Kenneth Myers
kmyersefo@...
Dec 18, 2005 11:33 am
34
Hi Ken, Auswertung1 deals with the motors that is first on the comparison sheet, Auswertung2 deals with the second one and so on... Auswertung (without an...
Thank you Christian, It all makes sense now. Was just curious. Hadn't used the Comparison Sheet, duh. ... Thanks, Ken...
Kenneth Myers
kmyersefo@...
Dec 19, 2005 11:36 am
36
Hi, I just submitted data for 2 new motors, Flyware MAX650 F5 and Überall Nippy Black 0508/73. These were my first submitted measurements, but I think I got...
In order to measure unloaded RPM you can utilise several techniques: 1. If it is an outrunner then stick a piece of white (or metallic) reflective tape on the...
Hi guys. I'm David Theunissen based in the south of England. I maintain www.flyelectric.ukgateway.net and would like to thank Ken Myers for his inspiration...
Hello David I drew your attention on D-Calc concerning the chapter: "Prop" Given a prop in a list, given rpm you get the Power in Watt This calculator seems...
Welcome David. I'm afraid the trouble with your Croco data must have to do with your measurement. In the D-Calc sheet the I-Diff. numbers prove the results are...
Thanks Louis and Christian, Christian, when I enter Ralph's data without n0 I get very low I-Diff and 83.7% as you say. When I enter n0=7350 I get very large...
Hi David, low I-Diff. numbers do indicate accurate calculation. If the computed current at some differently loaded operating points is very near to the ...
Well, at least I'm not the only one! :-) I have checked my DVM and measuring technique with other DVMs and leads and get the same results within 0.1v. I can't...
Hello David Even if your tach gives 3000 on 50 Hz light, maybe it could have problems on a rotor or a propeller due to bouncing or not clean pulse train. Could...
I'll try natural light over the weekend and try to borrow another rev counter and clamp meter if a friend is not travelling. My clamp meter is 0-300A but...
Hi David I suggest that for no load current you use a DMM range 10 A to compare to your clamp-meter Did you spotted that Rm is measured at 41 milliohm and...
... What light source have you been using then? You will not get valid results using mains lighting, you need to use a dc sourced light (torch or led) or...
Hi Louis, Rm as computed by Drive Calculator is not the copper resistance. It is a dynamic resistance and a property of the system consisting of the ESC and ...
I am using torches but I also have some indirect ambient mains light. I don't expect this to be causing problems but I need to eliminate all possibilities. I...
Christian, I normally do my no load test first when the motor is cool. Should I do it last after running load tests to the motor is up to operating ...
Hi Christian Yes I agree that both ESC + brushless form a tight couple ESC has its "dynamic internal resistance" and motor too But total dynamic Rm is...
Hi David See my previous reply to Christian D-Calc is a very good speadsheet but it gives an "average" If you want a better accuracy simulation you have to...
... FYI, correct url is http://electrofly.free.fr (there's no www !) cheers anthony [Non-text portions of this message have been removed]...
anthony hubbard
pasmonadresse@...
Jan 13, 2006 2:56 pm
56
Does the No Load current Io actually change very much with motor temperature? I though this current was dependent upon the iron losses in the motor, and thus...
Hi Neil Io changes with voltage principally (following rpm) due to iron losses Temperature effect is not very important Louis ... Does the No Load current Io...
Neil, no load current changes with temperature because of several reasons. I know you are familiar with the basics, but I'll summarize it anyhow: As we all...
Hi again. I don't have a successful conclusion yet and testing is on hold while I reset my croc's magnets. They got such a fright at 1300W that some jumped...
