Thread: Discussion Motor formulas
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Old Oct 12, 2008, 05:46 AM
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Antony (France)
Joined Sep 2003
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Quote:
Originally Posted by vos
Good afternoon colleagues. I have a motor (stator-2208,12 poles, 14 magnets)
How to calculate the maximal working current ({power}), and maximum theoretical current,with standard cooling. I know resistance, KV, voltage and сcurrent.
Is there are any formulas for this?I'm know one formula
IH=1000PH/√(ηHUHcosφH)
bun not working wery well on 3-Phase MODEL motor.

For example I winding LRK 20 turns, resistance ~0.1om (100mOm), a current 1.4A, KV 1900. (3S Lipo) .How calculate maximum current(power).?I'm not want take calсulators, only theoretical, whenever possible would be desirable without the stand.
Thank you very much.
Hi
"2208" stator class leads to a motor around 40 grams
A "rule of thumb" gives an approximate power max (for some minutes)
3W per gram --> 120W
Of course for bursts 10 seconds you can go higher (140-160W), it is a question of high quality magnet wire (HighGrade enamel)
The rising temperature is a slope + asymptote
Of course cooling air flow and/or fixing-mount (aluminum calorific capacity) play an important role.
Louis
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