Is my Motor/Speed Controller/Battery Pack Too Hot? -
02.01.2006, 09:41 AM
Although not always true, a rule of thumb is:
Hot motor, cool controller, cool batteries = undergeared
Cool motor, hot controller, hot batteries = overgeared
Warm motor, warm controller, warm batteries = happy components
Hot, warm, and cool vary as well, so here's another general rule:
Hot for a motor = generally over 160F (71C)
Hot for a controller = generally over 150F (66C)(or "thermal" range for the controller)
Hot for batteries = generally over 150F (66C) for nimh, 130F (54C) for lipo
Warm for a motor = generally 100F (38C) through 150F (66C)
Warm for a controller = generally 100F (38C) through 130F (54C)
Warm for batteries = generally 100F (38C) through 130F (54C) for nimh, ambient temp through 120F (49C) for lipo
Cool for all components = generally ambient temp and up to 10 degrees F (5.6C) more
The reasons the above are not always true are numerous, but may include:
Sticky drivetrain - will put un-necessary strain on electronics whether geared correctly or not.
Poor quality batteries - batteries will heat up regardless of gearing.
Wrong motor for the application - will put un-necessary strain on electronics whether geared correctly or not.
Wrong controller for the application - will put un-necessary strain on electronics whether geared correctly or not.
The list goes on, but this can give you an idea of things to watch for.
Edited to add the following:
Please note that this information applies to the sensorless brushless systems typically found here at RC-Monster.com (BK Warrior/Micro controllers, MGM controllers, BK motors, Lehner motors, Feigao motors). These rules do not apply to brushed systems or other brushless systems, at least not in the same ways.
Electronics run on smoke... if you let the smoke out, they stop working.
Last edited by Serum; 02.01.2006 at 04:22 PM.