Design Of Electromagnetic Energy Harvester Research Articles

Design of Electro-Magnetic Energy Harvester (EMEH) From Knee’s Muscle Work During Walking

Design of Electro-Magnetic Energy Harvester (EMEH) From Knee’s Muscle Work During Walking

Optimal Design of Electromagnetic Energy Harvester Using Analytic Equations

When electromagnetic (EM) energy harvesters are designed, it is common to use finite-element analysis to investigate or verify the input–output relationships. However, it requires significant computational resources if the system is nonlinear or if it is necessary to find the time-domain behavior of the harvester. If analytic or semi-analytic equations describing the field distribution are available, it would be useful for design optimization where numerous design variations must be evaluated and compared. In this paper, the field distribution around an array of permanent magnets is obtained using the method of equivalent current sheets and the method of image sources. Then, the interaction between the magnetic force and the induced voltage is modeled as nonlinear electrical damping in contrast to a damping constant which the existing literature commonly employs. The nonlinear system model is validated against the test results obtained from a prototype EM harvester. Finally, a design optimization is performed using the proposed model, resulting in an increase in the output power by 18% from the initial design.

Durable and Sustainable Strap Type Electromagnetic Harvester for Tire Pressure Monitoring System

A new concept design of electromagnetic energy harvester is proposed for powering a tire pressure monitoring sensor (TPMS). The thin coil strap is attached on the circumferential surface of a rim and a permanent magnet is placed on the brake caliper system. When the wheel rotates, the relative motion between the magnet and the coil generates electrical energy by electromagnetic induction. The generated energy is stored in a storage unit (rechargeable battery, capacitor) and used for TPMS operation and wireless signal transmission. Innovative layered design of the strap is provided for maximizing energy generation. Finite Element Method (FEM) and experiment results on the proposed design are compared to validate the proposed design; further, the method for design improvement is discussed. The proposed design is excellent in terms of durability and sustainability because it utilizes the everlasting rotary motion throughout the vehicle life and does not require material deformation.