F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F05 INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
F05B INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
2270/00 Control
F05B2270/10 Purpose of the control system
F05B2270/101 to control rotational speed (n)