Coil topology optimization method for electromagnetic vibration energy harvesting devices

Konferenz: MikroSystemTechnik - KONGRESS 2009
12.10.2009 - 14.10.2009 in Berlin, Germany

Tagungsband: MikroSystemTechnik

Seiten: 4Sprache: EnglischTyp: PDF

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Spreemann, D.; Folkmer, B.; Manoli, Y. (HSG-IMIT – Institute of Micromachining and Information Technology, Wilhelm–Schickard–Staße 10, 78052 Villingen-Schwenningen, Germany)
Manoli, Y. (Chair of Microelectronics, Department of Microsystem Engineering (IMTEK), University of Freiburg, Georges–Köhler–Allee 103, 79110 Freiburg, Germany)

This paper presents a coil topology optimization method for maximizing the output power and output power density of resonant vibration transducers with oscillating cylindrical magnet. In a first step a global design domain around the magnet is defined. Afterwards the most efficient positions for coil windings are determined. The results are used to start a virtual winding process which begins at the most efficient winding positions and continues until the output power gets maximal. The coil shape which results in a maximum power and power density respectively is different from the commonly used cylindrical coils with rectangular cross-section. However the benefit of the topology optimization depends on the design specifications. For fixed magnet dimensions and undetermined construction volume the output power can be increased by 80% with respect to commonly used architectures with cylinder magnet. However for constrained construction volume condition and variable magnet dimension there is no benefit of the topology optimization.