Abrégé

This patent discloses improvements over a mechanism to modulate the pitch of the blades of a fan, turbine or propeller driven by a rotating shaft bearing a helical thread onto which a nut made of a ferromagnetic material was threaded; this nut was spun by electromagnets disposed about it on the stator system and its resultant axial motion manipulated the blades' pitch. This patent discloses refinement of control of the electromagnets employed to spin the axial modulator by embedding a plurality of ferrous protuberances in this nut—the rotational position of which is determined via metallic edge detection sensors whose logic levels are used to selectively energize electromagnets that apply a force onto the protuberances in order to induce rotation and axial motion on the nut. This additional degree of rotational freedom is controlled by this reluctance-motor like configuration while a second motor is used to spin the blades.

Classes IPC  ?

• B64C 11/44 - Mécanismes de changement de pas des pales électriques
• F04D 29/36 - Montage des ailettes réglable
• B63H 3/06 - Hélices à pales orientables caractérisées par l'utilisation de moyens moteurs non mécaniques, p. ex. électriques
• B64C 11/06 - Montage des pales dans le cas de pales à pas variable
• B64C 11/32 - Mécanismes de changement de pas des pales mécaniques
• B64C 11/34 - Mécanismes de changement de pas des pales mécaniques automatiques
• F01D 7/00 - Rotors à aubes réglables en marcheLeur commande