Drive system comprising an inverter, an electric rotating machine and a control device, the inverter comprising a first input, a second input and N outputs, each of the first input and the second input being intended to be connected to a respective terminal of a DC source, each output being associated with a respective electrical phase, N being a natural number greater than or equal to two, the rotating machine comprising a stator and a rotor that is rotatable, relative to the stator, about an axis of rotation (X-X), the stator comprising N windings, each winding comprising an input and an output, the input of each winding being connected to a corresponding output of the inverter, the outputs of the windings of the stator being connected at a common point, the drive system being characterized in that it further comprises an output switching member connected between the common point and the second input of the inverter, the rotor comprising at least one magnetic element made of a material of adjustable magnetization, in particular of soft or semi-hard ferromagnetic material, the control device being configured to, simultaneously, during a magnetization step of each magnetic element of the rotor: - control the output switching member so that it is in an on state for a predetermined magnetization time interval; and - control the inverter to, for the magnetization time interval, connect the first input of the inverter to at least one and at most N-1 output(s) of the inverter, each forming a magnetization output, and disconnect the second input of the inverter from each magnetization output, said control device being further configured to perform the magnetization step prior to a step of exciting the rotating machine, the control device being configured to, during the excitation step, simultaneously: - control the output switching member so that it is in an off state; and - control the inverter according to a predetermined inverter control law to connect, successively over time, each output of the inverter to the first input and/or the second input of the inverter. the rotating machine comprising a stator and a rotor that is rotatable, relative to the stator, about an axis of rotation (X-X), the stator comprising N windings, each winding comprising an input and an output, the input of each winding being connected to a corresponding output of the inverter, the outputs of the windings of the stator being connected at a common point, the drive system being characterized in that it further comprises an output switching member connected between the common point and the second input of the inverter, the rotor comprising at least one magnetic element made of a material of adjustable magnetization, in particular of soft or semi-hard ferromagnetic material, the control device being configured to, simultaneously, during a magnetization step of each magnetic element of the rotor: - control the output switching member so that it is in an on state for a predetermined magnetization time interval; and - control the inverter to, for the magnetization time interval, connect the first input of the inverter to at least one and at most N-1 output(s) of the inverter, each forming a magnetization output, and disconnect the second input of the inverter from each magnetization output, said control device being further configured to perform the magnetization step prior to a step of exciting the rotating machine, the control device being configured to, during the excitation step, simultaneously: - control the output switching member so that it is in an off state; and - control the inverter according to a predetermined inverter control law to connect, successively over time, each output of the inverter to the first input and/or the second input of the inverter. - control the output switching member so that it is in an on state for a predetermined magnetization time interval; and - control the inverter to, for the magnetization time interval, connect the first input of the inverter to at least one and at most N-1 output(s) of the inverter, each forming a magnetization output, and disconnect the second input of the inverter from each magnetization output, said control device being further configured to perform the magnetization step prior to a step of exciting the rotating machine, the control device being configured to, during the excitation step, simultaneously: - control the output switching member so that it is in an off state; and - control the inverter according to a predetermined inverter control law to connect, successively over time, each output of the inverter to the first input and/or the second input of the inverter. - control the output switching member so that it is in an off state; and - control the inverter according to a predetermined inverter control law to connect, successively over time, each output of the inverter to the first input and/or the second input of the inverter.