Sadly thats the fate of lots of bagless cleaners that dont get the filters cleaned properly and regularly enough, lack of airflow through the motor, causes the windings to overheat and ruins the motor - if yours was indeed arcing pronounced ark-ing then its game over unless you can get another motor. As I said, many Dysons I have come across had loads of carbon brush life left, but were arcing and making smoke and terrible smell - each one had been run with blocked pre-motor filters due to neglect.
