Piezomotor Uppsala Ab

Piezomotor Uppsala Aktiebolag

Olov Johansson

Stefan Johansson

Jonas Eriksson

Christer Mattsson

Anders Jansson

Mats Bexell

Sölve Lindmark

The present invention combines bending mode mechanical (f) and electrical (f) resonances, whereby a relatively good efficiency can be achieved within a relatively broad frequency range (&#x394;f). An electrical resonance (f) or mechanical resonance is designed to be situated in the same order of magnitude as another mechanical resonance (f), but separated therefrom. Preferably, the separation (&#x394;f) is smaller than 2f/Q, where fis the resonance frequency for the resonance having lowest quality value, and Qis the corresponding quality value of the mechanical resonance. An electromechanical motor comprising a driving element and electrical resonance circuit according to the above ideas may comprise a double bimorph driving element having one single actuating point influencing a body to be moved. The double bimorph driving element is excited in bending vibrations perpendicular to a main displacement direction, whereby both tangential and perpendicular motions are created by bending mode vibrations.

Near-resonance wide-range operating electromechanical motor

In an electromechanical motor, elongated electromechanical drive elements are mechanically and preferably also electrically attached to a carrier. A spring is arranged to apply a force on the electromechanical drive element by pressing the backside of the carrier at a pivot point. The carrier is allowed to pivot around the pivot point around an axis parallel to a the element elongation. The electromechanical drive element is thereby suspended in a floating manner. The electromechanical drive elements are arranged to present a bending motion having strokes perpendicular to the elongation. The pivot point, the mechanical joint between the carrier and the electromechanical drive element, and preferably also a nodal point of bending motions of the electromechanical element are situated at a common plane perpendicular to the element elongation. In one embodiment, the electromechanical drive element is provided with metallizations to which the carrier is soldered.

Electromechanical motor and assembling method therefore

An electromechanical motor according to the present invention has a stator with a drive element consisting of two serially connected bending sections and a central drive pad, for actuating on a body to be moved. The drive element extends parallel to the body. The drive pad and/or the body is elastic. Preferably, the drive pad has a lower stiffness than the body. The elasticity of the drive pad allows an assimilation of a part of the travelling wave energy applied to the drive element. The backbone of the stator is arranged to restrict the drive element from being removed from the body, but at the same time allow the drive element to be translated towards the body and even leave the mechanical contact with the backbone for shorter periods of time. Support means are preferably designed with convex surfaces in order to allow self-centering of the different parts of the motor.

Near-resonance electromechanical motor

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Uppsala, Sweden

Olov Johansson