Vacuum pumping system having an oil-lubricated vacuum pump

An oil-lubricated vacuum pumping system, comprising:

• an oil-lubricated vacuum pump comprising a stationary pump stator and a rotatable pump rotor cooperating for pumping a fluid from a pump inlet to a pump outlet;
• a motor comprising a motor casing housing a stationary motor stator and a rotatable motor rotor cooperating for driving in rotation the pump rotor by a drive shaft having a first axial end, and a second axial end axially opposite the first axial end, the first axial end being nearer to the oil-lubricated vacuum pump than the second axial end, wherein:
• the motor stator and the motor rotor are separated by an air gap surrounding the motor rotor;
• and
• the motor casing comprises a casing axial wall surrounding the motor stator, and a casing end wall comprising a casing end wall inside surface facing the motor rotor;
• and
• an oil-tight jacket separate from the motor casing and enclosing at least a portion of the motor rotor, and forming a container configured to collect and keep oil inside the motor and to prevent the oil from leaking from the motor into an environment outside the motor,
• wherein the oil-tight jacket is composed of an oil-resistant, electrically insulating thermosetting or thermoplastic resin, and comprises:
• a portion of the motor stator poured with the resin;
• a resin layer forming a side wall of the container located in the air gap;
• and
• a resin layer forming a base of the container located axially adjacent to the second axial end and extending radially outwards from the side wall relative to the drive shaft,
• wherein the base comprises a base outer surface facing the casing end wall inside surface, and the oil-tight jacket is open at the first axial end and closed at the second axial end.