Electronic control unit for a vacuum pump

The invention is concerned with an electronic control unit (1) for the electric motor of a vacuum pump (100) comprising a suction port (119), an exhaust port (120) and pumping stages formed by rotor disks (113, 114) secured to a rotating shaft driven by an electric motor, and stator rings (115, 116) secured to a pump housing (101) and cooperating with said rotor disks. The unit (1) comprises: a housing (2), first leads (50) for electrically feeding the control unit, second leads (60) for electrically feeding the motor of the pump (100), a circuit for generating a voltage adapted to feed the motor, the circuit generating drive signals (A, B, D, E, G, H, PWM) and providing at least a pulsating signal (PWM the width of which for combining said drive signals can be modulated, and means (201, 202, 203) for combining the, pulsating signal (PWM) with at least one of the drive signals (A, D, G) so as to change the rms voltage of said voltage system.