Significant Output Power Enhancement in Symmetric Dual‐Mode Magneto‐Mechano‐Electric Coupled Resonators

Abstract

The microenergy harvesting based on magneto‐mechano‐electric (MME) coupling is an emerging technology for powering wireless Internet of Things (IoT) devices because it is capable of simultaneously harvesting magnetic field energy and mechanical energy. However, further improvement in output power of conventional cantilever‐structured MME energy harvesters has met with considerable difficulties due to the inherent, high mechanical energy loss in single‐mode operation. To solve the predicament, here, this work presents a symmetric, mechanical coupled dual‐mode MME energy harvester for restricting clamp loss and then enhancing MME coupling and output power. Under a weak AC magnetic field (Hac = 4 Oe) at 60 Hz, the MME energy harvester operating in symmetric dual‐mode can generate a peak‐peak output power of 72 mWpp (root‐mean‐square value: 9 mWRMS), a 437% enhancement over a conventional single‐mode MME energy harvester, which can even drive 160 light emitting diodes (LEDs) lighting directly. A realistic application furtherly shows that the symmetric dual‐mode MME energy harvester can successfully scavenge the magnetic field energy around a household appliance, and the generated electric power can directly drive a wireless IoT system in real time. The proposed concept of symmetric dual‐mode in this work can open new avenues for future vibration‐based energy harvesters design.

Self‐biased magnetoelectric composite for energy harvesting

“…The magnetostrictive phase induced by the magnetic field in a composite system generates strain (magnetostrictive effect), which is transferred to the piezoelectric phase through interface elastic coupling, thus inducing electric polarization (piezoelectric effect), as illustrated in Figure 1B. Due to the dependence of magnetostrictive strain on the applied magnetic field, an ac magnetic field ( H ac ) and a dc bias magnetic field ( H dc ) are usually required to trigger the ME coupling effect of such a composite 31–44 . The introduction of H dc often limits the miniaturization and precision of devices due to various drawbacks, such as low signal‐to‐noise ratio, weak resolution, and large device size.…”

“…ME composite systems composed of piezoelectric phases (P) and magnetostrictive phases (M) and possessing strong room temperature ME coupling (high ME conversion efficiency) are drawing considerable interest in the fields of vibration energy and magnetic energy harvesting. [33][34][35][36][37][38][39][40] The magnetostrictive phase induced by the magnetic field in a composite system generates strain (magnetostrictive effect), which is transferred to the piezoelectric phase through interface elastic coupling, thus inducing electric polarization (piezoelectric effect), as illustrated in Figure 1B. Due to the dependence of magnetostrictive strain on the applied magnetic field, an ac magnetic field (H ac ) and a dc bias magnetic field (H dc ) are usually required to trigger the ME coupling effect of such a composite.…”

Field‐Induced Multiscale Polarization Configuration Transitions of Mesentropic Lead‐Free Piezoceramics Achieving Giant Energy Harvesting Performance

“…[1][2][3][4] Over the past two decades, the research on piezoelectrics has primarily been driven by the constantly changing technological demand and the trend toward a sustainable society. [5,6] Ferroic materials with coexisting states of comparable energy typically exhibit extraordinary responses to external stimuli, such as giant electrocaloric effect and magnetostriction, which can be exploited in ferroelectrics to design advanced piezomaterials. [7] For instance, the rhombohedral and tetragonal (R-T) phase boundary of PZT ceramics brings up excellent piezoelectricity.…”

Autonomous Resonance‐Tuning Mechanism for Environmental Adaptive Energy Harvesting

“…These tasks may be impossible in harsh environments, such as the outside walls of skyscrapers, deep undersea, and expansive forests. [ 5 , 6 , 7 ] Energy harvesting technology that captures unused ambient energy and converts it into usable electrical power can provide the most feasible solution for this problem. [ 8 , 9 , 10 ]…”

“…These tasks may be impossible in harsh environments, such as the outside walls of skyscrapers, deep undersea, and expansive forests. [5][6][7] Energy harvesting technology that captures unused ambient energy and converts it into usable electrical power can provide the most feasible solution for this problem. [8][9][10] Among ambient energies, mechanical energy is commonly available around us, particularly in industrial sites, transportation systems, and household appliances, and has a relatively higher energy density than other energy sources.…”