A variable reluctance energy harvester (VREH) based on electromagnetic induction isdeveloped for generating electrical energy from low-speed rotary motion. The challengeof a VREH at low rotational speeds is not only the low output power, but alsothe torque ripple that the harvester generates. Cogging torque, the major contributionto this torque ripple, is an inherent characteristic of VREH and is caused by its geometricfeatures. Cogging torque produces acoustic noise and mechanical vibration fora drive system into which the VREH is embedded. This issue is of particular importanceat low speeds and with light loads. In this paper, we use an m-shaped VREHas an example to propose a three-phase design in order to reduce the cogging torquebut maintain a high output power at low speeds of 5 rpm to 20 rpm. Three identicalm-shaped pickup units in a proper arrangement generate high amounts of electricalenergy in three phases, but result in a lower torque ripple. Ten prototypes based onthe proposed design were fabricated and tested, and their performance were in goodagreement with the simulation results. By using the three pickup units in an optimizedarrangement, the VREH enhances the energy harvesting performance in comparisonto three single pickup units. At the same time, the torque ripple is reduced to one fifthof that produced by a single pickup unit. This demonstrates the strong potential of thethree-phase VREH for implementations of self-powered wireless sensing systems interms of energy output and mechanical effects on the rotary host.
Three-phase variable reluctance energy harvesting
Paper
Elektronische Ressource
Englisch
DDC: | 629 |
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