Large-Stroke Piezo Platform with Cross Ball Guide
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Solution Overview
Problem
Current precise positioning platforms, such as those using piezoelectric ceramics, face issues like poor step consistency, low retention force, and movement performance affected by load, which hinder high precision and large-stroke capabilities in micro-nano technology applications.
Innovation Solution
A one-dimensional large-stroke precise positioning platform is designed with a cross ball guiding rail, piezoelectric ceramic, and elastic member, where the piezoelectric ceramic is abutted by fixing members and connected via a flexible member, providing pre-tensioning and adjustable friction to enhance precision and bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric ceramic is used as drive source, then positioning precision is improved, but stroke length is limited
Solution Approach 1:
The positioning platform is divided into multiple segments including piezoelectric ceramic drive units, flexible hinges, and guiding rails. The piezoelectric ceramic provides precise micro-displacement while the flexible hinge and guiding rail structure enables cumulative large-stroke movement through coordinated segmentation of functions.
Solution Approach 2:
The patent employs a nested structure where the piezoelectric ceramic is embedded within the positioning platform housing, and the flexible hinge mechanism is integrated within the guiding rail assembly. This nested arrangement allows compact integration of precision drive and large-stroke transmission functions.
2Force
If cross ball guiding rail is added, then bearing capacity is improved, but device complexity increases
Solution Approach 1:
The cross ball guiding rail provides enhanced bearing capacity specifically at the motion constraint locations where guidance is needed, while other parts of the platform maintain simpler structures. This localized application of complex guidance mechanism optimizes the balance between bearing capacity and overall structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The platform achieves high precision, consistent performance, low friction, and strong bearing capacity, enabling nanoscale positioning precision and millimeter-scale movement, addressing the limitations of existing systems.
Implementation Method 1
piezoelectric ceramic has many excellent properties, such as small size, high frequency response, little heat generation, large output force, no noise, stable performance
Implementation Method 2
an elastic member disposed within the housing; the elastic member is fixed on the first fixing member
Implementation Method 3
the first fixing member is connected with the second fixing member by a flexible member
Implementation Method 4
a cross ball guiding rail arranged at one side of the housing, the cross ball guiding rail including a mover guiding rail and stator guiding rails
Data Source
AI summary
A one-dimensional large-stroke precise positioning platform includes a housing, a cross ball guiding rail, piezoelectric ceramic and an elastic member. The cross ball guiding rail includes a mover guiding rail and stator guiding rails. A first and second fixing member is movable in a containing chamber provided in the housing. In the longitudinal direction of the mover guiding rail, one end of the piezoelectric ceramic is abutted against the first fixing member, and the other end against the second fixing member. The mover guiding rail is fixed on the second fixing member, and the elastic member is fixed on the first fixing member. In the width direction of the mover guiding rail, the two sides of the elastic member are abutted against the inner side surfaces of the containing chamber, and the first fixing member is connected with the second fixing member by a flexible member.