Patent ID: 7604393

Claim:
A fluid displacement device comprising: a homopolar motor comprising a substrate having first and second opposing surfaces; a rotatable planar disk comprised of a continuous sheet of conductive material and disposed on a first surface of said substrate and having a central disk axis about which said rotatable planar disk can rotate; a first electrical contact forming a first electrical connection between a central portion of said rotatable planar disk proximate to said central disk axis and a first conductive element disposed on said substrate; a second electrical contact forming a second electrical connection between a radial edge portion of said rotatable planar disk and a second conductive element disposed on said substrate; and at least one fluid displacement structure provided on said rotatable planar disk, said fluid displacement structure including a plurality of vanes extending transverse to an exterior planar surface of said rotatable disk opposed from said substrate; wherein said conductive material extends from said radial edge portion to said central disk axis and provides a radial path for the flow of electric current between said first and second electrical contacts.