{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

MECH466-Lecture-7 - MECH 466 Systems University of Victoria...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 MECH 466 Microelectromechanical Systems University of Victoria Dept. of Mechanical Engineering Lecture 7: Electrostatic Sensors and Actuators May 31st, 2007 Mech 466, N. Dechev, UVic 2 Parallel Plate Capacitors Equilibrium Positions of Electrostatic Devices Pull-in Voltage Overview Mech 466, N. Dechev, UVic
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3 Parallel Plate Capacitors Consider an “ideal” parallel plate capacitor: Mech 466, N. Dechev, UVic A Where: A - Overlap area of two plates E - Electric Field d - distance between the two plates E d A dielectric material will occupy the space between the two plates: The ‘Relative’ electrical permitivity is defined as: The permitivity of the material is: Where , is the permitivity of free space (vacuum) 4 Parallel Plate Capacitors The capacitance between two plates is defined as: Mech 466, N. Dechev, UVic Stored Charge Electrostatic Potential = A E d The electric energy stored in the capacitor is:
Image of page 2
5 Parallel Plate Capacitors To obtain an expression for capacitance for the parallel pales, we can use Gauss’s Law, where the electric field: This can be substituted into the capacitance equation to obtain: Mech 466, N. Dechev, UVic 6 By measuring C accurately, we can sense changes in A (area), Permitivity, or d (distance between plates).
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern