NDLI: Micro-Rotational Generator

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Rivera-Nieves, Amarilys Cordero-Vazquez, Rolando Carbajal, Gerardo Romero, Edwar Michael, R. Neuman Robert, O. Warrington
Copyright Year	2011
Abstract	Energy harvesting is a relatively new research area that extracts energy from the surroundings to power autonomous systems. This project presents a generator that harnesses the motion of high speed rotational motors for machine health monitoring. Wireless accelerometer-based sensors for detecting crack initiation on rotating shafts are typically limited by the battery finite lifetime. Miniature generators attached to rotating shafts can scavenge small amounts of energy for powering such monitoring systems. Electromagnetic induction approaches (using coils and magnets) have been widely described in literature for larger machines but few at the micro-scale. This paper investigates a multiple-pole permanent magnet design with multiple-stacks of planar coils for energy generation without using Silicon-based processing at the micro-scale. Planar coils are manufactured from 18μm thick Copper-clad on 25μm thick polyimide. The 25mm diameter coils were stacked and bonded with cyanoacrylate for a stacked thickness of 360μm. The rotor was made of a 25mm in diameter (2mm thick) CNC machined PMMA disk with 20 slots (1mm×2mm×6mm) for placing commercial NdFeB permanent magnets. The entire generator had a volume smaller than 1.5cm3. Experimental results show that the generator is capable of producing an average voltage output of 15.5V and 727mW of power (with a matching load) at a constant rotational speed of 29,500rpm.
Starting Page	371
Ending Page	374
Page Count	4
File Format	PDF
ISBN	9780791854976
DOI	10.1115/IMECE2011-65043
Volume Number	Volume 11: Nano and Micro Materials, Devices and Systems; Microsystems Integration
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Accelerometers Computer numerical control machine tools Microscale devices Electromagnetic induction Rotors Motors Generators Permanent magnets Crack detection Batteries Energy harvesting Machinery Magnets Stress Design Poles (building) Monitoring systems Energy generation Disks Silicon Sensors Copper
Content Type	Text
Resource Type	Article

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