How does a Brushless motor fail when you excessively load the motor?

Loading a brushless motor can be done in any RC application. It is as simple as providing too much gearing in an RC car or too much prop in an RC airplane.

As the motor is overloaded, it will demand more power. Since voltage in our brushless motors are constant, the only parameter that is left to change is the amount of current. Current increases and as a direct result so does the amount of heat generated. Heat generation occurs in the windings of a brushless motor. Too much heat can destroy the magnets of the rotor.

As magnets are destroyed the kv of the brushless motor increases, thereby placing more stress on the motor. This pattern continues until the windings burn up. No more windings or magnets and you now have a paperweight.

There are two methods to preventing this. First is by researching the best power system for your application. The second method is by frequently checking the temperature of your power system during its first run. Once you establish confidence in the temperature you can reduce the frequency in which you measure heat to one every handful of runs you make.

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