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Airliner cleaners use backpack vacuums-they have motors in them that run from the airplanes 208/120V 400 Hz 3ph power supply.for aircraft cleaning FAA regulations require vacuums with sparkless motors.the 400Hz motors are 3 Ph induction-since it runs at 400Hz the speed is very fast and the motor is compact for its power.A 2hp 400Hz 208V 3 Ph motor is about the size of a 1 pound coffee can.
