Method for attaching axial flow fan blades to an electric motor having an external rotor with a circumferential groove into which the roots of the blades are welded.

摘要

The outer rotor (9) of the motor has a precision groove (20) in the outer surface (11) and a number of fan blades (12) have a foot section (21), matching the dimensions of the groove, inserted and welded on both sides in the groove.