Drive system for driving a fluid compression device and associated power supply method

A drive system comprising an inverter, a rotary electric machine and a control device,

• the inverter including a first input, a second input, N arms connected in parallel between the first input and the second input with N being a natural number greater than or equal to 2;
• each arm including an upper half-arm and a lower half-arm connected in series, the upper half-arm being connected to the first input, the lower half-arm being connected to the second input, the upper half-arm and the lower half-arm of each arm being connected together at a corresponding output of the inverter;
• each upper half-arm and each lower half-arm comprising at least one switching module capable of switching between an on and an off state;
• each first input and second input being configured to be connected to a different terminal of a direct current source and each output being connected to an electric phase;
• the rotary machine including a stator and a rotor which rotates relative to the stator about a rotation axis, the stator comprising N windings with each winding having 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 to a common point;
• the rotor including at least one magnetic element made from a modular magnetization material;
• the control device being configured, during a step of magnetization of each magnetic element of the rotor, to control the inverter to simultaneously, during a predetermined magnetization time interval to magnetize the magnetic elements:
• for each one of m arms of the inverter formed into a current injection arm, with m being a natural number ranging between 1 and N−1, controlling each switching module of the corresponding upper half-arm to be on, and controlling each switching module of the corresponding lower half-arm to be off,
• for each one of k arms of the inverter, selected from N−m other arms of the inverter, and forming each selected other arm into a current output arm, controlling each switching module of the corresponding upper half-arm to be off and controlling each switching module of the lower half-arm to be on, and
• for each of the N−m−k other arms, controlling each other arm with the switching module to be off.

A power supply method for a rotary electric machine using an inverter comprising a first input, a second input, N arms connected in parallel between the first input and the second input, N being a natural number greater than or equal to 2,each arm comprising an upper half-arm in series with a lower half-arm, the upper half-arm being connected to the first input, the lower half-arm being connected to the second input, each upper half-arm and each lower half-arm being connected together at an output of the inverter;

• each upper half-arm and each lower half-arm comprising at least one switching module configured to switch between on and off, each of the first input and the second input being configured to connect to a different terminal of a direct current source, each output being an output of an electric phase, the rotary machine comprising a stator and a rotor which rotates relative to stator about a rotation axis, the stator comprising N windings, each winding having an input and an output, the input of each winding being connected to an output of the inverter with N outputs of windings of the stator being connected at a common point;
• the rotor comprises at least one magnetic element made from a modular magnetization material;
• the power supply method comprising magnetizing each magnetic element of rotor comprising steps of:
• connecting each of the first input and the second input to the different terminal of the direct current source;
• and
• simultaneously, during a predetermined magnetization time interval for each of the m arms of the inverter, forming each of the arms into a current injection arm with m being a natural number ranging between 1 and N−1;
• controlling each switching module of a corresponding upper half-arm to turn on and controlling each switching module of a corresponding lower half-arm to turn off;
• for each of the k arms selected from among the N−m arms of the inverter, forming each one of the selected k arms into a current output arm, controlling each switching module of the corresponding upper half-arm to turn off and controlling each switching module of a corresponding lower half-arm to turn on;
• and for each of the N−m−k other arms, controlling each corresponding switching module to turn off;
• and
• simultaneously injecting into each winding an electric current which generates, in a cavity of the stator, a non-zero magnetic field for magnetizing each magnetic element.