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Old Jul 03, 2015, 06:52 PM
starzak is offline
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Chacotoma, NM
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Emax BL 2205/22 Question ?

The Emax BL 2205/22 is only rated for a 2S LiPo, but I have read here about people using it on a 3S LiPo. Does anyone have any personal experience using this motor on 3S ? ? ?

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Old Jul 04, 2015, 09:34 AM
Ron van Sommeren is offline
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homo ludens modellisticus
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Netherlands, GE, Nijmegen
Joined Feb 2001
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You'd have to prop down, motorcurrent is proportional to voltage squared (and Kv cubed). Simple instructive table giving the extra current when you add one extra cell to a pack

(a.k.a. "why did my motor and/or controller and/or battery go up in smoke ??? )

A 10% change in battery voltage will give a 20% change in current, a 10% change in Kv will give a 30% increase. Not quite, because battery voltage will sag more due to higher current, but you'll get the idea.

Our RC voltages by themselves don't kill motors, wire insulation can stand up to 200volt. Current kills, creates heat, volts only jolt.

Motor must be able to handle the rpm though. According to Kv = 1940rpm/volt. On 3s it would do about 24krpm, about 30% less with prop.

Controller must be able to drive your motor at that rpm, processor/computationwise.
Table giving max. rpm per make/type controller, per number of magnetpoles
→ More info
→ ESC Max. RPM Limits (below winding diagram table)

Prettig weekend Ron
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Last edited by Ron van Sommeren; Jul 04, 2015 at 09:53 AM.
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