Planetary gear for wind energy plant, has strain measurement sensor measuring strain changes on internal gear surface, and evaluating unit detecting value corresponding to ball bearing damage condition based on measuring signal from sensor

摘要

The gear has an internal gear (1) engaged with planetary wheels. The wheels stand in engagement with a sun gear that is arranged coaxial to the gear (1). A strain measurement sensor (6) arranged at a surface of the internal gear measures strain changes on the surface. An evaluating unit determines a value corresponding to a ball bearing (4) damage condition based on a measuring signal from the sensor. An independent claim is also included for a method for early detection of damages at a ball bearing of a planetary gear.