Wind turbine diagnostic device for generator components

A generator for a wind turbine comprising:

• a wind turbine diagnostic device for diagnosing mechanical damage to one or more generator components of at least one wind turbine, the wind turbine diagnostic device comprising
• at least one speed sensor for determining a rotational speed of a generator of the at least one wind turbine, the speed sensor having at least one speed signal output for outputting the determined rotational speed,
• a frequency analysis module with at least one speed signal input connected to the speed signal output by a speed signal line, and a frequency spectrum signal output for outputting a frequency spectrum, the frequency analysis module being configured to determine a frequency spectrum from the determined rotational speed, and
• a comparator having a frequency spectrum signal input connected to the frequency spectrum signal output by a frequency spectrum signal line, the comparator being configured to compare a frequency spectrum with a prescribed standard frequency spectrum and to diagnose mechanical damage to the one or more generator components based on the comparison.

A wind turbine comprising:

• a generator;
• and
• a wind turbine diagnostic device for diagnosing mechanical damage to one or more generator components of at least one wind turbine, the wind turbine diagnostic device comprising
• at least one speed sensor for determining a a rotational speed of a generator of the at least one wind turbine, the speed sensor having at least one speed signal output for outputting the determined rotational speed,
• a frequency analysis module with at least one speed signal input connected to the speed signal output by a speed signal line, and a frequency spectrum signal output for outputting a frequency spectrum, the frequency analysis module being configured to determine a frequency spectrum from the determined rotational speed, and
• a comparator having a frequency spectrum signal input connected to the frequency spectrum signal output by a frequency spectrum signal line, the comparator being configured to compare a frequency spectrum with a prescribed standard frequency spectrum and to diagnose mechanical damage to the one or more generator components on the basis of the comparison.

A method of diagnosing mechanical damage to one or more generator components of a wind turbine, comprising:

• determining a time series of a rotational speed of a generator of the wind turbine comprising determining a frequency spectrum of the rotational speed of the generator;
• comparing the frequency spectrum of the rotational speed of the generator with a prescribed standard frequency spectrum;
• and
• determining mechanical damage to the one or more generator components based on the comparison.