Patent ID: 9429077
Filing Date: 2016-08-30
CPC Classification: F01D,F02C,F05D

Claim Text:
1. A method of controlling operation of an arrangement having at least a first turboshaft engine and a second turboshaft engine of a helicopter, each turboshaft engine having a first electric machine on a compressor spool, the compressor spool having both at least one turbine stage and at least one compressor stage, and a second electric machine on a power spool, the power spool having a low-pressure turbine stage, the method comprising: determining an increase in a power requirement and a difference in revolutions per minute between the first turboshaft engine and the second turboshaft engine; upon determining, extracting electrical power from the power spool of the first turboshaft engine using the second electric machine of the first turboshaft engine, and driving the compressor spool of the second turboshaft engine using a portion of the extracted electrical power from the power spool of the first turboshaft engine.