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Micromachines 2014, 5(3), 442-456;

Implementation of Synchronous Micromotor in Developing Integrated Microfluidic Systems

Institute of Microtechnology, Technische Universität Braunschweig, Langer Kamp 8, 38106 Braunschweig, Germany
Mechatronics Engineering Department, German Jordanian University, Amman 11180, Jordan
Author to whom correspondence should be addressed.
Received: 5 May 2014 / Revised: 8 June 2014 / Accepted: 7 July 2014 / Published: 18 July 2014
(This article belongs to the Special Issue 15 Years of SU8 as MEMS Material)
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This paper introduces the synchronous micromotor concept and presents new investigations on its application as an integrated driving mechanism in microfluidic systems. A spiral channel viscous micropump and a microstirrer are considered and tested as examples to verify the concept. The fabrication technology of such integrated systems is based on UV depth lithography, electroplating and soft lithography. The synchronous micromotor consists of a stator including double layer coils, and a rotor disk containing alternate permanent magnets. The coils are distributed evenly around the stator and arranged in three phases. The phases are excited by sinusoidal currents with a corresponding phase shift resulting in a rotating magnetic field. Regarding the spiral channel viscous micropump, a spiral disk was fixed onto the rotor disk and run at different rotational speeds. Tests showed very promising results, with a flow rate up to 1023 µL·min−1 at a motor rotational speed of 4500 rpm. Furthermore, for the application of a microstirred-tank bioreactor, the rotor disk design was modified to work as a stirrer. The performance of the developed microbioreactor was tested over a time period of approximately 10 h under constant stirring. Tests demonstrated the successful cultivation of S. cerevisiae through the integration of the microstirrer in a microbioreactor system. These systems prove that synchronous micromotors are well suited to serve as integrated driving mechanisms of active microfluidic components. View Full-Text
Keywords: microfluidic; SU-8; micromotors; electromagnetic; pump; micro bioreactors; active microsystems microfluidic; SU-8; micromotors; electromagnetic; pump; micro bioreactors; active microsystems

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Al-Halhouli, A.; Demming, S.; Waldschik, A.; Büttgenbach, S. Implementation of Synchronous Micromotor in Developing Integrated Microfluidic Systems. Micromachines 2014, 5, 442-456.

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