| 摘要 |
A fluid displacement device ( 100 ) having a homopolar motor ( 110 ). The homopolar motor includes a rotatable disk ( 115 ) with at least one fluid displacement structure ( 120 ) disposed thereon. The fluid displacement structure can be a blade. The rotatable disk can be disposed within a cavity ( 145 ) defined in a substrate ( 105 ), such as a ceramic substrate, a liquid crystal polymer substrate, or a semiconductor substrate. A closed loop control circuit ( 235 ) can be included to control the rotational speed of the rotatable disk. For example, the control circuit can control a voltage source or a current source that applies voltage across the rotatable disk. The control circuit also can control a strength of a magnet ( 210 ) that applies a magnetic field ( 205 ) substantially aligned with an axis or rotation ( 155 ) of the rotatable disk.
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