does collector rotor that couples with a flexible rotor 50Hz, is rigid or flexible?

and balance process do only mass residual balancing?(iso1940)

Keep in mind that collector from one side couple to the main rotor and another side-mounted on journal bearing.
 

 

Original Post

It is another mass on a flexible rotor. Balancing it may or may not affect vibrations at other bearings. Have you contacted a knowledgeable person with OEM? If vibration is considered high on the bearings, then look for mounting eccentricity and resonant bearing housing before considering trim balancing.

Walt

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