The little brushless motors for RC cars do lose bearings pretty quick. They are rebuildable and all, but a couple of hundred watts out of a couple ounce motor and something has to give. They are designed for maximum power out of a very small and light package, not longevity. Many of them require rebuilding every 10 hours of run time or less.
If you want a brushless DC motor, with speed controller built in no less, that will handle high side loadings and long runs, try something a bit larger. Those annoying little electric scooters, and electric bicycles as well, have 250W-400W brushless DC motors that have bearings that can handle a LOT of abuse. A PWM speed control board is integrated into the motor housing on many models. Nice bonus is that they often have a brake circuit on the motor as well. (useful for e-stop!)
You can get them brand new uninstalled >very< cheap off of EBAY as the fad is over for scooters. $20-40 bucks will get you a very nice motor.
They are light, but are still 4"-5" in diameter instead of 1", but no worries about overheating or bearing life....  |