Patented cyclone technology
There are other bagless vacuums that use cyclones. But inefficient cyclones allow dust to pass right through, onto the filter, clogging it and causing a loss of suction during use.
Dyson cyclones are more efficient than any other. They generate centrifugal forces of up to 360,000G, hurling dust and dirt from the airflow. Particles as small as 0.5 microns are flung straight into the clear bin.