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Jan 27, 2013, 12:30 PM
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Romania, BV, Brasov
Joined Apr 2010
12 Posts
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Hello,
I am surprised by these results. You got peak efficiency at speeds which seems for me too high for a 24N28P motor. I also wonder that you (and the manufacturer) recommend not so big propellers. Particularly, the last reviewed motor XM4010TE-7 is recomended to be used in the range of 10-16V with a propeller of up to 12x10. Currently I am using the quite similar NX-4008 motor: http://hobbyking.com/hobbyking/store...ter_Motor.html, rewound by myself to have Kv=500rpm/V. (It can be compared to your last reviewed XM4010TE-7.) The power supply is not 3-4s as recommended (for the original Kv=620rpm/V), but 2s and I use really big propellers: Aeronaut CAM 16x13 and even 18.5x15 (on Easy Glider). It performs very well and I fly usually 1h25' with 2s 3.3Ah. Can you test one of them (let's say XM4010TE-7) at 2s to find out the peakeff for 2s? Or even for 6V? (because my rewound NX-4008 with Kv=500rpm/V supplied at 8V can be compared with XM4010TE-7 at 6V) |
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Last edited by ViorelX; Jan 27, 2013 at 12:43 PM.
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Jan 27, 2013, 01:34 PM
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Antony (France)
Joined Sep 2003
2,598 Posts
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Hi ViorelX
XM4010TE-7 @ 6V 6,01 V ; no load Io = 0,86 A ; 3853 rpm ; Peakeff 78,4% taking Rm = 0,0920 ohm Using Dualsky Calc 3.20 on XM4010TE-7 (motor #56) http://www.rcgroups.com/forums/showthread.php?t=1078160 On 2S you could go to APC 17x8E at limit 18A But you are far away from Peakeff You need also some cooling, because temperature is the major actor On your rewound 4008 (Kv 500 rpm/V) what is your mesured ph-ph resistance ? Louis |
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Last edited by Fourdan; Jan 27, 2013 at 01:45 PM.
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Jan 27, 2013, 02:10 PM
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Romania, BV, Brasov
Joined Apr 2010
12 Posts
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Hi Louis,
I got a ph-ph resistance of 85mOhms. If the motor is turned at about 3000rpm (with a lathe) a phase generate a 4.4V voltage and thus I determined a Kv of about 500rpm/V (actually, the lathe rpm may be of 2800rpm). With the 16x13 propeller the static current consumption on full throttle is of 18A. After 1min of running the motor is still cold. With the 18.5x15 propeller the motor takes 22A and warms up a bit after 1 min of run. It doesn't seem to me that it runs far away from the peak efficiency. And, of course, I haven't had any problems with the heat inflight after long time running. |
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Last edited by ViorelX; Jan 27, 2013 at 02:25 PM.
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Jan 27, 2013, 03:16 PM
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Antony (France)
Joined Sep 2003
2,598 Posts
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Hi ViorelX
Is your 4.4V peak (oscilloscope) or rms (AC DMM) ? Louis |
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Jan 28, 2013, 01:06 AM
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Romania, BV, Brasov
Joined Apr 2010
12 Posts
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Not peak, I measured the rms value by a digital multimeter.
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Apr 12, 2013, 08:52 AM
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Joined Mar 2013
6 Posts
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Neodymium grade
Great review, thank you.
What is the grade of neodymium? In for example XM5015TE-3. |
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Apr 15, 2013, 05:04 AM
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Antony (France)
Joined Sep 2003
2,598 Posts
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Quote:
Hereunder is the reply coming from Dualsky HQ Shanghai after my asking: The magnets for TE series are N42SH, the temperature grade is 150°C Louis |
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Apr 15, 2013, 08:08 AM
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USA, ME, Ellsworth
Joined May 2008
13,887 Posts
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And here, at K&J Magnetics, are a couple of pages that present some handy specs for the various grades of magnets:
Neodymium Magnet Physical Properties - http://www.kjmagnetics.com/specs.asp Pull Force and Surface Field Data - http://www.kjmagnetics.com/magnetsummary.asp I can't vouch for the honesty or accuracy of all the info but to those of us that know little, it seems more interesting than knowing less...  Jack |
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