Article,

An Electrothermomechanical Lumped Element Model of an Electrothermal Bimorph Actuator

, and .
Journal of Microelectromechanical Systems, 17 (1): 213--225 (February 2008)
DOI: 10.1109/jmems.2007.908754

Abstract

This paper reports a simple electrothermomechanical lumped element model (ETM-LEM) that describes the behavior of an electrothermal bimorph actuator. The ETM-LEM is developed by integrating an electrothermal LEM of a heater with a thermomechanical LEM of a bimorph actuator. This new LEM uses only one power source in both the electrical and thermal domains. The LEM provides a simple and accurate way of relating the output mechanical response of a bimorph actuator to the electrical inputs. The model shows that the tip angular rotation of the bimorph actuator is linearly proportional to its average temperature change. The LEM predicts a linear relationship between both the average temperature change and bimorph tip angular rotation versus voltage when operated above a certain voltage. The LEM is used to predict the rotation angle of a fabricated electrothermal bimorph micromirror in response to the electrical inputs and produces results that agree with finite element model simulations and experimental data within 15\% for all measured parameters.

Tags

Users

  • @gdmcbain

Comments and Reviews