The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2009
Filed:
Jan. 26, 2005
Rudolf Neumann, Spaichingen, DE;
Rudolf Neumann, Spaichingen, DE;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
The invention relates to a piezoelectric drive unit and a method for generating a preferably rotating drive movement for such a drive unit. The drive unit comprises a stator (), a rotor, embodied to rotate about a rotational axis (), with relation to the stator and drive elements, preferably in the form of several piezoelectric actuators (). The drive unit further comprises an annular gap (), filled with a fluid medium (), arranged between the facing surfaces of the stator () and the rotor (), several piezoelectric actuators (), arranged adjacent to the gap, which perform an essentially radial length change in the direction of the gap () on electrical activation, such that the mechanical energy, provided by the actuators, is transformed into flow energy of the fluid medium, whereby the flow energy of the fluid medium is transmitted to the rotor () and transformed into a rotating drive movement of the rotor.