Miniswys Sa

Miniswys Ag

Bonny Witteveen

Edwin Daamen

Florian Kaufmann

A drive unit for the movement of an active element with respect to a passive element, wherein the active element includes a resonator and at least one excitation device for exciting oscillations of the resonator. The resonator includes contact regions for exerting forces onto the passive element. The active element may be driven with respect to the passive element by way of oscillating movements. The resonator includes at least two arms, preferably a pair of arms. The at least two arms of an arm pair, proceeding from a connection region of the resonator, are formed on the same side of the resonator. In each case the contact regions are formed at the outer ends of the arms, wherein the contact regions may be moved to and away from one another by way of oscillating movements of the arm pair. Thereby, a relative movement of the passive element with respect to the active element may be effected.

Drive unit

A piezoelectric drive that is used to create a relative movement between a first and a second body on a plane of movement. The drive includes a flat metal sheet () that forms, or is secured to, the first body and that is arranged parallel to the plane of movement. The metal sheet () has a rest region () and at least one resonator area (). An elastic spring area (), which is parallel to the plane of the metal sheet, is disposed between the rest region () and the resonator area (). A flat, rectangular piezoelement (), which can be excited in a 3,1 mode, is coupled to a longitudinal axis (A) such that the longitudinal axis of the piezoelement () lies essentially on a longitudinal axis of the resonator area (). The resonator area () protrudes above the piezoelement () in the direction of the longitudinal axes (A), and forms a tapered horn shape (). The second body () is positioned relative to the sheet metal () such that the at least one resonator area (), with an edge area that is disposed at the top of the horn shape, is pressed against a surface () of the second body (), which is oriented in an essentially oblique manner relative to the plane of the sheet metal (), by prestressing the spring area at a point of contact.

Piezoelectric drive

The piezoelectric motor () comprises a stator () and a runner () which form a gap () as well as comprising a piezoelectric transducer () which is connected to the stator () or the runner () and which with the stator () or the runner () forms a resonator (), wherein the resonator () may be excited in a main oscillation direction (H), characterised in that the stator () comprises an engagement surface () facing the runner (), or the runner () an engagement surface which faces the stator (), and that the stator () or the runner () comprises an elastic advance element () which bridges the gap () between the stator () and the runner () in a manner such that the advance element () at least temporarily lies on the engagement surface (). The advance element () comprises a first part-section () as well as a second part-section (), wherein the part-sections () have a different resonant frequency.

Piezoelectric motor and method for actuating same

A piezoelectric drive () with an inner part () that is surrounded by an outer part (). The inner part () includes at least one piezoelement () that is actively connected to an oscillation element (). The oscillation element () has a middle part () about which at least one arm () is arranged. The arm is actively connected to the outer part () via an interaction region () and is designed such that, when set into oscillation by way of the at least one piezoelement (), it drives the outer part () relative to the inner part ().

Growing community of inventors

Venlo, Netherlands

Bonny Witteveen