

Apr 13, 2011, 02:42 PM  

I use this thread as a primary reference for motor equations on RCG:
http://www.rcgroups.com/forums/showthread.php?t=587549 Kv is related to the termination and # of turns for a given motor... Kv*turns=constant. Be aware there are winding schemes that may physically have 12 loops of copper, but as far as physics and math are concerned they are really 6T (4T, 3T... endless possibilities). So you also must take note if the wind is terminated with parallel coils or not. Once you establish Kv*T for your motor, you can design the number of turns/termination that will give your target Kv for your application. The exact Kv depends on how your load behaves. The dynamics of your load is something that motor equations won't help with. So you also need to put a number on operating torque. With double the input power at the same RPM, hopefully you'll operate at least double the torque, otherwise efficiency will be lower than the original. That said, if you're running the same torque and RPM, the current could be a bit less than half the original (more efficiency as amps drop). Hope this $.02 helps... there are much more knowledgeable motor calc guys out there who might chime in with the good stuff. Cheers, Kev edit: regarding wire thickness... calculate the total cross sectional area of the original windings, and try to meet or exceed that as best you can. More copper area is ALWAYS better. Wait a minute... just noticed "brushes"... this info pertains to brushless, LOL! Sorry. 
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