RC-Monster Forums - View Single Post

Serum · 07.31.2005, 05:22 AM

A sweet spot has got nothing to do with the RPM range where a motor works in.. basicly a high KV motor on less cells gets hotter than a low kv motor on much cells.

every motor knows a sweetspot, which is the direct result of the maxximum amount of energy the magnet on the rotor can translate in rotation. If the truck is overgeared, the magnetic field will jump over the rotation speed of the rotor, with which a big lost of energy will happen.

Small motors with lower quality magnets need to run on an higher RPM than bigger motors with high quality rotor magnets.

From what i experienced, that segmented rotors, from high end motors, such as the plettenberg bigmaxximum, get hottor when geared taller. though i don't know if this experience is adequate, because the bigmaxx has got a fan.. (normal things with a self powered fan, such as powerdrills, get less air when they most need it (motor rotates slower when they are fully loaded.. )

With the feigao types of motors they get very hot when ran with allmost no load..

A motor can get less hot when used on more cells too

A IR tempgun gives you the proper information with this tuning.

I am a personall fan of big motors (such as the 7XL) with a taller gearing. Dafni had some temp issues (at least his car had) he tried some setups, but he found his grale with the 7XL on 14 cells.

In germany they run the biggest available Lehner motor (2280) on 'only' 20 cells at 63 mph.

Asmll note though; smaller motors/rotors take less energy to reacht the top RPM than larger types.. (but the larger ones can produce more rotation energy when the spin up..)

	(#12)
Serum RC-Monster Admin Offline Posts: 10,480 Join Date: Feb 2005	07.31.2005, 05:22 AM A sweet spot has got nothing to do with the RPM range where a motor works in.. basicly a high KV motor on less cells gets hotter than a low kv motor on much cells. every motor knows a sweetspot, which is the direct result of the maxximum amount of energy the magnet on the rotor can translate in rotation. If the truck is overgeared, the magnetic field will jump over the rotation speed of the rotor, with which a big lost of energy will happen. Small motors with lower quality magnets need to run on an higher RPM than bigger motors with high quality rotor magnets. From what i experienced, that segmented rotors, from high end motors, such as the plettenberg bigmaxximum, get hottor when geared taller. though i don't know if this experience is adequate, because the bigmaxx has got a fan.. (normal things with a self powered fan, such as powerdrills, get less air when they most need it (motor rotates slower when they are fully loaded.. ) With the feigao types of motors they get very hot when ran with allmost no load.. A motor can get less hot when used on more cells too A IR tempgun gives you the proper information with this tuning. I am a personall fan of big motors (such as the 7XL) with a taller gearing. Dafni had some temp issues (at least his car had) he tried some setups, but he found his grale with the 7XL on 14 cells. In germany they run the biggest available Lehner motor (2280) on 'only' 20 cells at 63 mph. Asmll note though; smaller motors/rotors take less energy to reacht the top RPM than larger types.. (but the larger ones can produce more rotation energy when the spin up..)