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Modeling of a high force density fishbone shaped electrostatic comb drive microactuator.
Megat Muhammad Ikhsan Megat Hasnan1, Mohd Faizul Mohd Sabri2, Suhana Mohd Said1
1Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Thescientificworldjournal
|August 29, 2014
Summary
A novel fishbone-shaped electrostatic comb drive actuator design significantly enhances electrostatic actuation force. This innovative microactuator design shows potential for high force density applications in microelectromechanical systems (MEMS).
Area of Science:
- Microelectromechanical Systems (MEMS)
- Electrostatic Actuation
Background:
- Conventional electrostatic comb drive actuators face limitations in achieving high force density.
- Increasing electrode capacitance is a key strategy to enhance electrostatic actuation force.
Purpose of the Study:
- To design and evaluate a novel fishbone-shaped electrostatic comb drive actuator.
- To compare the performance of the fishbone design against traditional straight-sided comb drives.
Main Methods:
- Two-dimensional finite element analysis (FEA) was employed for simulation.
- Simulations focused on displacement and electrostatic force under constant active area and gap distance.
- The fishbone actuator featured 16 fingers within an 800 × 300 μm active area.
Main Results:
- The fishbone-shaped actuator demonstrated a significantly higher electrostatic actuation force compared to the straight-sided design.
- Simulated drive force improvement for the fishbone actuator reached approximately 485% over conventional designs.
- Performance was evaluated by comparing displacement and electrostatic force metrics.
Conclusions:
- The fishbone actuator design offers a substantial increase in electrostatic actuation force density.
- This design presents a promising solution for high force density electrostatic microactuator applications in MEMS.
