Rotor balance ring and oil flinger

A turbocharger comprising:

• a magnetic rotor rotatably mounted within the turbocharger about a rotor axis, the magnetic rotor having a magnetic core disposed within a shell, the magnetic rotor having a first axial end and a second axial end opposite the first axial end;
• a first balance ring of the magnetic rotor forming the first axial end and having a first base and a first flange extending axially from the first base past the first axial end of the rotor, the first base being located within the shell, the first flange of the first balance ring extending away from the shell and including a first cylindrical shaped cutout having a first open end extending radially outward from the rotor axis and a first cutout axis aligned to an axis of the magnetic rotor;
• a second balance ring of the magnetic rotor forming the second axial end and having a second base and a second flange extending axially from the second base past the second axial end of the rotor, the second base being located within the shell, the second flange of the second balance ring extending away from the shell and including a second cylindrical shaped cutout having a second open end extending radially outward from the rotor axis and a second cutout axis aligned to axis of the magnetic rotor;
• a stator;
• an airgap between the stator and the rotor;
• and
• a shaft rotatable about the rotor axis;
• wherein the first balance ring and the second balance ring are configured to be an oil flinger to eject oil from the first cutout and the second cutout as the first balance ring and the second balance ring rotate, and the first cutout and the second cutout are configured to have a diameter based on a measured imbalance of the magnetic rotor.

A rotor for a turbocharger comprising:

• a magnetic core mounted on a shaft of the turbocharger, the magnetic core having a shell;
• a balance ring disposed on a first axial end of the magnetic core and having a base and a flange extending axially from the base away from the first axial end of the magnetic core and extending radially away from the shaft of the turbocharger, the base being contained within the shell;
• and
• a cylindrical shaped cutout provided on an outer circumferential surface of the flange of the balance ring, the cutout having an open end extending radially outward from a rotor axis and a cutout axis aligned to an axis of the magnetic core,
• wherein the balance ring is configured to be an oil flinger to eject oil from the cutout as the balance ring rotates, and the cutout is configured to have a diameter based on a measured imbalance of the magnetic rotor.