System and method for selective activation and deactivation of electrical brushes used in a dynamoelectric machine for current density optimization

A dynamoelectric machine, comprising:

• a rotatable shaft;
• a rotor body mounted on the rotatable shaft, the rotor body having a plurality of field windings of coils secured thereabout;
• at least one collector ring placed on an end of the rotatable shaft;
• a plurality of electrical brushes maintained on a surface of the at least one collector ring as the at least one collector ring rotates with the rotatable shaft, wherein the plurality of electrical brushes are configured to pass electrical current between an external source and the field windings of coils secured to the rotor body via the at least one collector ring;
• and
• an arrangement of a plurality of switches electrically connected to the plurality of electrical brushes to selectively activate and deactivate the plurality of electrical brushes during the rotation of the rotor body, wherein selective ones of the plurality of switches are opened and closed for a predetermined time period to adjust an average current density of the electrical current passing through the electrical brushes to be within a predetermined current density range while the rotor body is rotating.