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but how tight is the belt and how easy is the brush to turn? if the belt is slopy it will slip on the motor drive spindle,,,and it will get very hot then,,, also if the brush head is tight that makes the belt slip too,
Even though the brush is spinning, the belt is probably worn out and stretched. when you vacuum the shag carpet, it puts more drag on the brush. try running it on a shorter carpet or hard floor for a few minutes. if it doesn't smoke, then you know it's your belt. if it does smoke, then it's probably the motor burning up.
you forgot to say if it is a 3 phase machine
if it is 3 phase then a phase in the unit is overheating and that will stop the machine then blow the breaker as all phases have to draw equal current
if it is a single phase then the start/ run capacitor or centrifugal start run points are not breaking at speed and so the start windings are overheating and causing the breaker to trip
Take it to an electrical motor rewind shop and have it properly tested with test equipment
Belt is slipping because the bearings on the beater brushes, which it turns, are jammed or full of dust.
Alternatively the belt has stretched after being overheated and needs replacing because it now slips.