Energy Harvesting from an Artificial Bone

Abstract:

• Energy Harvesting : The process by which energy is derived from external source.
• In this paper, an artificial bone  that can harvest energy from human motion is proposed. ¢It is the solution for future energy needs.
• Faraday’s law of electromagnetic induction, a moving part is needed to generate a varying spatial magnetic field. ie, a larger volume is inevitable in electromagnetic induction generation apparatus due to the moving part.

OPERATING PRINCIPLE:

Villari effect: The operating principle is based on the inverse magnetostrictive effect, which is also called the Villari effect. Change in magnetization can be produced by applying stress on the material.

• A piece of magneto-strictive material was embedded in the middle of the artificial bone as the energy harvesting component.
• When the artificial bone was compressed, the magneto-strictive material was also stressed, which caused a variation in the permeability according to the villari effect.
• The varied permeability led to a varied spatial magnetic field. The varied spatial magnetic field was acquired by a collecting coil, and was transmitted and stored as a kind of energy from the human motion.

BASIC WORKING PRINCIPLE

Coupling system having 3 domains 1.Magnetic domain 2.Mechanical domain 3. Electrical domain

• Magnetic domain consists of the magnetostrictive material 2826MB embedded in the AB and the bias magnet.
• Mechanical domain includes the force F , which contains energy from other sources. The stress causes a change in the permeability of the material, according to the Villari effect. Then change in the spatial flux density of the collecting coil.
• Electrical domain is made up of the collecting coil and the payload resistance. The change in spatial flux density is converted into electrical energy through Faraday’s law of electromagnetic induction. Mechanical energy is transformed into Electrical energy through a mechanical-magnetic-electrical coupled system.