Patent ID: 7354254

Claim:
A compact vacuum pump, comprising: a body, defining a pumping chamber a pump rotor ( 4 ) located within said pumping chamber, and a motor ( 8 ) for rotating said pump rotor ( 4 ) being a cup-type motor, said motor ( 8 ) having: a motor rotor ( 14 ) forming a single part with said pump rotor ( 4 ); an internal stator member ( 11 ) and an external stator member ( 12 ) defining a hollow space ( 13 ) therebetween and housing said motor rotor (l 4 ), wherein at least one of said internal and external stator members ( 11 , 12 ) comprises grooves ( 17 , 17 â€², 18 ) defining corresponding channels cooperating with a surface of said motor rotor for gas pumping.