Electrostatic Actuator Protruding Electrodes
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Solution Overview
Problem
Existing electrostatic actuators face challenges in achieving a large driving force while maintaining a compact size and reducing the driving voltage, due to limitations in electrode design and machining accuracy, which complicates fine control and increases the device's size.
Innovation Solution
The electrostatic actuator features a stator and mover with protruding electrodes on their surfaces, where side surfaces of the electrodes face each other, and planar electrodes are used to increase the facing area, allowing for a larger electrostatic force generation with reduced voltage and size, and includes a conductor pattern for efficient signal application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the facing area between electrodes is increased to generate larger electrostatic force, then the driving force is improved, but the device size becomes larger
Solution Approach 1:
The invention transitions from planar electrode facing to three-dimensional protruding electrode configuration. By making electrodes protrude from the stator and mover surfaces, the facing area is extended into the third dimension (height direction), significantly increasing the electrostatic force generation area without increasing the planar footprint of the device.
Solution Approach 2:
The electrode structure is segmented into multiple protruding elements arranged in arrays. Instead of using a single large planar electrode, the invention divides the electrode into numerous smaller protruding electrodes that can be densely packed, increasing the total facing area while maintaining a compact overall device structure.
2Force
If the gap size between electrodes is decreased to increase electrostatic force, then the driving force is improved, but the machining accuracy requirement becomes more stringent
Solution Approach 1:
By extending electrodes in the height direction rather than reducing the gap between planar surfaces, the invention achieves larger electrostatic force without requiring ultra-precise gap control. The protruding structure provides mechanical tolerance compensation and reduces sensitivity to gap variations.
3Force
If the applied voltage is increased to generate larger electrostatic force, then the driving force is improved, but the breakdown voltage and power supply limitations arise
Solution Approach 1:
The three-dimensional protruding electrode structure increases the effective facing area and electrostatic force without requiring higher operating voltages. The increased surface area compensates for the lower voltage, allowing operation within safe breakdown voltage limits while maintaining high driving force.
4Force
If the area of each electrode on the stator is increased to increase facing area, then the electrostatic force is improved, but the fine control capability deteriorates
Solution Approach 1:
The electrode is divided into multiple smaller protruding elements that can be independently controlled. This segmentation enables fine control by selectively activating specific electrode groups while maintaining large total facing area through the cumulative effect of all protruding electrodes.
Solution Approach 2:
By extending electrodes vertically rather than expanding their planar area, the invention achieves large facing area without reducing the number of controllable electrode elements. The three-dimensional structure preserves control granularity while increasing force generation capacity.
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
This design enhances the electrostatic force between electrodes, enabling a larger driving force with reduced voltage and device size, improving the actuator's efficiency and control precision.
Implementation Method 1
the electrostatic force is proportional to a square of the applied voltage and the facing area between electrodes, and is inversely proportional to a gap size between the electrodes
Implementation Method 2
an electrostatic actuator that can provide a large driving force by generating a large electrostatic force (a Coulomb force) is needed
Data Source
AI summary
An electrostatic actuator includes a stator having a plurality of protruding electrodes formed on a surface of a base material, where the surface serves as a counter surface, and a mover disposed so as to face the stator, where the mover has a plurality of protruding electrodes formed on a surface of a base material and the surface serves as a counter surface. A side surface of each of the protruding electrodes of the stator faces a side surface of a corresponding one of the protruding electrodes of the mover. Planar electrodes are formed on at least one of the counter surface of the stator and the counter surface of the mover in a portion other than a portion where the protruding electrodes are formed, and the planar electrodes face end surfaces of the protruding electrodes formed on the other counter surface.