Electromagnetic Bridge Energy Harvester Utilizing Bridge’s Vibrations and Ambient Wind for Wireless Sensor Node Application

Table 2

Main features and dimensions of developed BEHs.

Feature	Prototype I	Prototype II
Coil’s resistance	54.5 Ω	28 Ω
Magnetic flux density	1.32 T	1.32 T
Magnet’s mass	55.6 grams	55.6 grams
Magnet’s dimensions	20 mm × 20 mm	20 mm × 20 mm
Coil and magnet gap	1.5 cm	1 cm
Number of coil turns	965	400
Width of beam-I	4 cm	3 cm
Width of beam-II	—	2.9 cm
Thickness of beam-I	0.40 mm	0.40 mm
Length of beam-I	14 cm	8 cm
Thickness of beam-II	—	0.30 mm
Length of beam-II	—	5.7 cm
Airfoil dimensions	10 cm × 10 cm × 3 cm	8.5 cm × 8 cm × 2 cm
Device overall size	14 cm × 9 cm × 5 cm	8 cm × 6 cm × 4 cm