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Simulating effect of parasitic capacitances in vertical comb drives

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Wunderbear

Mechanical
Jun 27, 2011
13
Hello,

I am relatively new to ansys and I am trying to simulate an electrostatic comb drive for a micromirror. The two sets of comb drives are staggered with respect to each other in the vertical direction and there is a dummy wafer (which is 'hanging') under the top comb bank.

I am using coupled field elements to simulate the air gap (SOLID226).How should I model this dummy wafer so that I can accurately capture its effect on the electrostatic force? Also, what voltage boundary conditions should I apply on it?

Also, for this problem, which approach will give better accuracy: The multifield 'load-transfer' method or the coupled field elements method?
 
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