Method for operating a vacuum pumping system and vacuum pumping system suitable for implementing such method

• Main Authors: Andrea Lepore, Andrea Bertallot, Roberto Carboneri, Giuseppe De Palma
• Format: Patent
• Language: English
• Published: 31.03.2021
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

The present invention relates to a method for operating a vacuum pumping system comprising a vacuum pump, a motor for driving said vacuum pump and an oil tank connected to said vacuum pump for providing oil as coolant and/or lubricating fluid. More particularly, the present invention relates to a method for operating such a vacuum pumping system at cold start. According to the invention, in case of "cold start", before starting the pump, the windings of the motor stator are energized while the motor rotor is kept stationary (200) and the power supplied to the windings of the motor stator is used for heating the motor stator (300). The heat can be transferred from the motor stator to the oil (400) and the temperature of the oil can be raised before the vacuum pump is started. As a result, when the motor rotor starts to rotate and to drive in rotation the pump rotor, the viscosity of the oil has decreased and the required torque has been reduced. The present invention also relates to a vacuum pumping system (50) which is particularly suitable for implementing the aforesaid method.