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The motor has several factors alone that you may consider when choosing the correct one. Such as its efficiency at a particular voltage/rpm, the amount of torque it puts out, max rpm's, total horsepower, etc. I have some data for the 7XL at 14.4 and 22.2 volts. I'm still working on this calculator and it definately needs some input/output tuning, but maybe the following numbers will give you an idea of what these motors can do. For comparison purposes I put the Feigao 7XL @ 14.4v and 22.2v. Also listed is the Plettenberg MAXXimum @ 22.2v. Remember that these are just numbers, your mileage may vary. btw, I believe the Feigao's are rated at 50000 max rpm's. You'll see that 22.2v puts you just above that. Of course depending on many factors you'll probably not get to 50000 rpm's. If something looks fishy about the numbers below lemme know. I haven't looked at my calculator in a while, but I know that it can use some improvements. Feigao 7XL @ 14.4v ~~ [14.4 volts, 30 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33900.6240 powerin: 432.0 watts powerout: 362.9160 watts HP: .4864 efficiency: 84.00% torque: 13.44 oz-in ~~ [14.4 volts, 40 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33767.2320 powerin: 576.0 watts powerout: 503.2480 watts HP: .6745 efficiency: 87.00% torque: 19.20 oz-in ~~ [14.4 volts, 50 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33633.8400 powerin: 720.0 watts powerout: 642.4600 watts HP: .8612 efficiency: 89.00% torque: 24.96 oz-in ~~ [14.4 volts, 60 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33500.4480 powerin: 864.0 watts powerout: 780.5520 watts HP: 1.0463 efficiency: 90.00% torque: 30.72 oz-in ~~ [14.4 volts, 70 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33367.0560 powerin: 1008.0 watts powerout: 917.5240 watts HP: 1.2299 efficiency: 91.00% torque: 36.48 oz-in ~~ [14.4 volts, 80 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33233.6640 powerin: 1152.0 watts powerout: 1053.3760 watts HP: 1.4120 efficiency: 91.00% torque: 42.24 oz-in ~~ [14.4 volts, 90 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 33100.2720 powerin: 1296.0 watts powerout: 1188.1080 watts HP: 1.5926 efficiency: 91.00% torque: 48.00 oz-in ~~ [14.4 volts, 100 amps] ~~ voltageconstant: .0060 Kt: .0080 (oz-In/I) rpm: 32966.8800 powerin: 1440.0 watts powerout: 1321.7200 watts HP: 1.7717 efficiency: 91.00% torque: 53.76 oz-in Feigao 7XL @ 22.2v ~~ [22.2 volts, 30 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 52480.2240 powerin: 666.0 watts powerout: 561.8160 watts HP: .7531 efficiency: 84.00% torque: 13.44 oz-in ~~ [22.2 volts, 40 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 52346.8320 powerin: 888.0 watts powerout: 780.1480 watts HP: 1.0457 efficiency: 87.00% torque: 19.20 oz-in ~~ [22.2 volts, 50 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 52213.4400 powerin: 1110.0 watts powerout: 997.3600 watts HP: 1.3369 efficiency: 89.00% torque: 24.96 oz-in ~~ [22.2 volts, 60 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 52080.0480 powerin: 1332.0 watts powerout: 1213.4520 watts HP: 1.6266 efficiency: 91.00% torque: 30.72 oz-in ~~ [22.2 volts, 70 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 51946.6560 powerin: 1554.0 watts powerout: 1428.4240 watts HP: 1.9147 efficiency: 91.00% torque: 36.48 oz-in ~~ [22.2 volts, 80 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 51813.2640 powerin: 1776.0 watts powerout: 1642.2760 watts HP: 2.2014 efficiency: 92.00% torque: 42.24 oz-in ~~ [22.2 volts, 90 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 51679.8720 powerin: 1998.0 watts powerout: 1855.0080 watts HP: 2.4866 efficiency: 92.00% torque: 48.00 oz-in ~~ [22.2 volts, 100 amps] ~~ voltageconstant: .0093 Kt: .0125 (oz-In/I) rpm: 51546.4800 powerin: 2220.0 watts powerout: 2066.6200 watts HP: 2.7702 efficiency: 93.00% torque: 53.76 oz-in Plett HP 220/40/A2 @ 22.2v ~~ [22.2 volts, 30 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 47567.2500 powerin: 666.0 watts powerout: 625.5517 watts HP: .8385 efficiency: 93.00% torque: 17.28 oz-in ~~ [22.2 volts, 40 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 47239.2000 powerin: 888.0 watts powerout: 837.2376 watts HP: 1.1223 efficiency: 94.00% torque: 23.04 oz-in ~~ [22.2 volts, 50 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 46911.1500 powerin: 1110.0 watts powerout: 1045.9234 watts HP: 1.4020 efficiency: 94.00% torque: 28.80 oz-in ~~ [22.2 volts, 60 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 46583.1000 powerin: 1332.0 watts powerout: 1251.6093 watts HP: 1.6777 efficiency: 93.00% torque: 34.56 oz-in ~~ [22.2 volts, 70 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 46255.0500 powerin: 1554.0 watts powerout: 1454.2951 watts HP: 1.9494 efficiency: 93.00% torque: 42.24 oz-in ~~ [22.2 volts, 80 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 45927.0000 powerin: 1776.0 watts powerout: 1653.9810 watts HP: 2.2171 efficiency: 93.00% torque: 48.00 oz-in ~~ [22.2 volts, 90 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 45598.9500 powerin: 1998.0 watts powerout: 1850.6668 watts HP: 2.4807 efficiency: 92.00% torque: 53.76 oz-in ~~ [22.2 volts, 100 amps] ~~ voltageconstant: .0101 Kt: .0135 (oz-In/I) rpm: 45270.9000 powerin: 2220.0 watts powerout: 2044.3527 watts HP: 2.7404 efficiency: 92.00% torque: 59.52 oz-in |
Great info!!
How did you calculated it? What numbers are exactly used? |
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I wrote a "program" (if you will) whereby I can enter the voltage constant, no load current, internal resistance, and desired voltage (it also has an amp iterator which I arbitrarily started at 30I and ended at 100I). I've checked the specs on the main players in r/c brushless (hacker, lehner, plett., etc.) and verified the aforementioned values and plugged them into my "calculator." You can find a grid w/ those values of the motors I listed (and many many many more) at the following link -> (http://www.motocalc.com/data/motor.html). Interestingly you won't find the same values for Lehner motors. :( I'll hopefully be calculating at least the 2400XL in the very near future. Kinda funny that I've spent so much time looking into various motors but will end up purchasing a brand that seems to have an excellent name recognition for quality. Go figure. Anywho, its really simple, just collect the motor constants for a given motor (see the link above) and complete the formula's on which you'd like more information. For the most part all the information you need is out there (the web and search engines are the best thing ever)...well to at least make an educated decision. Including formula's for mass, velocity, and the like. I've not played w/ my calculator in a while (I want to expand on it) due to work (being so darn busy)...like I am tonight posting on the forums. ;) With regards to expansion I want to integrate a gearing calc and mass/velocity calc into this to help find the elusive sweet spot. Its geeky fun. |
Nice!!
How did you get the unloaded rpm/v range of the plettenberg if i may ask? It would be nice to have a convertor, that allows you to type the mass, gearing ratio and the motor information based on your calculator, among with the amount of power available, to see what the load of the controller would be like. I don't exactly know what you mean, is it the information you need on the lehner motors or is the calculator showing different numbers? here is the link to the lehner motors but i am sure you allready found it. Are you willing to share the program with us? Sounds very interesting! It would be nice for you to have an eagletree car data recorder to compare the practice with the theory.. |
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Schnikes! I forgot you linked that for me earlier. :-) Maybe you can help me w/ the translation? From the "grafik" ;) http://www.lehner-motoren.de/diagram...13v/grafik.gif U=voltage I= amps N=RPM? M=Time or distance? W=Efficiency Raw numbers http://www.lehner-motoren.de/diagram....13v/liste.txt I believe the headers are; "Spann. Volt" = "Volts In" "Strom Amp." = "Amps Drawn" "PEing. Watt" = "Watts In (Power In)" "Drehz. U/Min." = "RPM's" "Moment Ncm" = Not sure about this one "PAusg. Watt" = "Watts Out (Power Out)" "Wirk. %" "Efficiency=Power In/Power Out" The raw numbers and the charts are basically what I would be able to plot w/ my calculator, provided I have the correct information. It appears that Lehner will provide the result of the formulas but not the data within them. I supposed I can solve for the missing variables w/ the data given. |
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Check my linky (http://www.motocalc.com/data/motor.html). Scroll down, you'll find the Plettenberg information you so desire. ;) |
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I'm tired... been up for 40+ hours. The link that I gave has the source data. The formulas which utilize that source data are pretty easy to find on google. This link has a fairly decent first read on the subject -> http://www.slewin.clara.net/elec/tmotor.htm |
okay, Thanks!
I will dive in to it later this evening, i am working on our kitchen for our new house... The n/cm value is newton/cm (torque) Rough numbers; 100 oz/inch = 7112 gram/cm = 71ncm |
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Hey, did you get your LiPo's? Huh? Did ya? Did ya? :D btw, what voltage are you going to run? ...guess that'll answer my question about whether you're going serial or parallel. |
I'll have the lipo packs in about 4 hours; I'm picking them up today.
With my current controller issue (9918 losing brakes) I won't be able to test them in my buggy, but I do plan on putting one in my XXX-T MF with the MGM 12012 and xl5000 to see what 11.1v will do to it :) In my 1/8th buggy I'll be running the two 3s 3200 packs in parallel for 11.1v and 6400 mah to get through 15-minute races. Once I get a solution from Mike regarding my 9918, I'll get the lipo packs into the buggy and get some results. |
Well, 11.1 volts and the xl5000 is gonna be on the crazy side in your xxx. Stock up on diff parts (and be ready to rebuild). 60+ mph is not out of the question at all with that setup.
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I'm hoping to have my 12012 hooked up to my 8L in my 1/8th buggy for this weekend. Once I do, I'll finally be able to let you know how those Kokam 3200 3s packs do.
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Because I'm a d0rk...here are constants for a Lehner 2400xl;
Rm=.0043 Lo=4.7 Kv=2400 (duh) |
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