Positioning motor and apparatus

Details Positioning motor and apparatus Positioning motor and apparatus

2007-05-25

2010-06-01

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020, C310S323040, C310S329000

Reexamination Certificate

active

07728488

ABSTRACT:
A piezoelectric motor has a stator module (1), comprising two pairs of piezoelectric actuators (1a,1b) and (2a,2b) inside this stator module. The stator module is fixed by a central fixing point (A). The piezoelectric actuators (1a,1b,2a,2b) are connected to the stator module via flexible or biasing elements (3), such as for instance hinges, for instance elastic hinges. The stator module (1) comprises a tuning mechanism (4), comprising at least one mass (4a,4b) and at least one flexible or biasing element (5a,5b,5c,5d), for instance leaf springs. The stator module (1) is contacted to a driven part (6), for instance a slider, at the contact point (A). The piezoelectric motor is designed such that contact point (B) is able to produce a closed trajectory, thereby inducing a relative motion of the driven part (6). The contact point (B) is moved by applying an electric field to actuators (1aand1b) and/or by applying an electric field to actuators (2aand2b).

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Van de Vijver, W., et al. “A multi-DOF positioning stage based on novel piezoelectric resonant drive modules.” 2006 IEEE Ultrasonics Symposium, Vancouver, Canada, Oct. 3-6, 2006, pp. 164-167, XP002463480.

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