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A magnetically levitated magnetoelectric vibration generator using a Halbach array
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DOI：10.1016/j.sna.2020.112301.png)
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Abstract
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This paper proposes a magnetoelectric (ME) vibration generator based on magnetic levitation. The generator uses a Halbach array and a magnet bar to constitute the suspending magnet structure of the magnetic levitation system. The Halbach array employs three NdFeB magnet rings with a particular magnetization pattern, which produces concentrated magnetic field on the outer side where the ME transducer array is placed. Consequently, the ME transducer array undergoes larger magnetic field variations and more vibration energy is converted into electrical energy. An analytical model is developed based on the solution of the kinetic equation and the equivalent circuit of the ME transducer array. Experiments have been conducted and the analytical model is validated by the experimental results. The generator produces a maximal power of 957.8 mu W with an optimal load resistance of 1.45M Omega at the acceleration of 0.6g. The proposed device using a Halbach array exhibits a similar to 2.5 times higher output power than that of the harvester employing a conventional suspending magnet bar. (C) 2020 Elsevier B.V. All rights reserved.
Keywords:
Magnetoelectric (ME) vibration generator
Halbach array
Concentrated magnetic field
ME transducer array
Analytical model
Equivalent circuit
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