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GriffinRU · 04.08.2007, 01:16 AM

Just to be clear on motor loaded - unloaded business.

If controller can handle it (high RPM) or limit it then there is no harm.
Mechanically Feigao motors rated at 50000 RPM Max (bearing and balancing wise).
Temperature more then 90Deg C is bad because of higher differential temp of magnet (mainly you should worry about magnet) and copper losses. Do not forget about balancing epoxy which can come loose and epoxy holding end-caps.

I am hearing a lot about loaded Kv numbers does anybody knows what the load is? Because there are lots of ways to calculate it and estimate.

With higher RPM current goes up because of inertia of rotor, so their will be RPM when it is less noticeable based on rotor size. And that is where power is dissipated and heat is coming from. And that is another reason not to run BL motors with out load or more correctly without control of RPM.

	(#4)
GriffinRU RC-Monster Aluminum Offline Posts: 748 Join Date: Oct 2005	04.08.2007, 01:16 AM Just to be clear on motor loaded - unloaded business. If controller can handle it (high RPM) or limit it then there is no harm. Mechanically Feigao motors rated at 50000 RPM Max (bearing and balancing wise). Temperature more then 90Deg C is bad because of higher differential temp of magnet (mainly you should worry about magnet) and copper losses. Do not forget about balancing epoxy which can come loose and epoxy holding end-caps. I am hearing a lot about loaded Kv numbers does anybody knows what the load is? Because there are lots of ways to calculate it and estimate. With higher RPM current goes up because of inertia of rotor, so their will be RPM when it is less noticeable based on rotor size. And that is where power is dissipated and heat is coming from. And that is another reason not to run BL motors with out load or more correctly without control of RPM.