In case of Direct Driven Vacuum Pump, the vacuum Pump unit is connected to prime mover (Electric Motor) directly coupled with a flexible coupling or mounted on a extended shaft of the electric motor. These pumps also have the internal arrangement as

The Rotor is fitted in eccentric possession of the stator and while the rotor is rotating at higher RPM, the vanes fitted In the slots are thrown out of the rotor towards the periphery of the stator and eventually slid inside the rotor slots where the clearances is not available, thereby the available volume is swept out from one end of the stator to the another end connection of the stator.