Method for operating an electric media-flow machine, control unit, media-flow machine, compressor and/or turbine

A control unit for operating an electric media-flow machine for at least one of a compressor and a turbine comprising a shaft rotationally mounted in a housing having an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, the electric media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the electric media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the electric media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for the medium flowing from the inlet to the outlet through the media-flow machine, wherein the control unit carries out a method for operating the electric media-flow machine, the method comprising:

• driving the drive winding at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor,
• wherein a holding force of deposited ferromagnetic particles on the rotor is canceled such that the deposited ferromagnetic particles detach from the rotor.

An electric media-flow machine mounted to a shaft that is rotationally mounted in a housing having an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, the electric media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the electric media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the electric media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for the medium flowing from the inlet to the outlet through the media-flow machine, wherein a control unit is configured to drive the drive winding at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor,

• wherein a holding force of deposited ferromagnetic particles on the rotor is configured to be canceled such that the deposited ferromagnetic particles detach from the rotor.

At least one of a compressor and a turbine, comprising:

• a housing;
• at least one of a compressor impeller and a turbine wheel;
• a shaft that is rotationally mounted in the housing and on which the at least one of the compressor impeller and the turbine wheel is disposed in rotatably fixed manner;
• and
• a media-flow machine including a rotor disposed in rotatably fixed manner on the shaft, the media-flow machine including a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to an inside, the media-flow machine including a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially, and the media-flow machine including an outer sleeve that is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, the stator teeth extending through the outer sleeve at least up to the inner sleeve, and flow channels being formed between the outer sleeve, the inner sleeve, and the stator teeth as an only flow path for a medium flowing from an inlet to an outlet through the media-flow machine,
• wherein the drive winding is configured to be driven by a control unit at least intermittently such that a drive winding generates an opposing field rectified relative to a rotor magnetic field of the rotor,
• wherein a holding force of deposited ferromagnetic particles on the rotor is configured to be canceled such that the deposited ferromagnetic particles detach from the rotor.