Patent ID: 8505411

Claim:
Apparatus for balancing a rotating element of a machine, comprising: at least one balance ring mounted to the rotating member of the machine, said at least one balance ring having an actuator, a pivot element spaced about 180° from said actuator, a first balancing weight located on one side of a plane extending through said actuator and said pivot element and a second balancing weight located on the other side of said plane, a first pair of flexure elements coupled to said first balancing weight and a second pair of flexure elements coupled to said second balancing weight; an electrical energy generating device coupled to said actuator; a light source spaced from said electrical energy generating device across an air gap, said light source being positioned to direct radiant energy to said electrical energy generating device; said actuator being effective to move at least one of said first and second balancing weights to a selected location powered by electrical energy from said electrical energy generating device.