TY - GEN
T1 - A wrist-worn rotational energy harvester utilizing magnetically plucked {001} oriented bimorph PZT thin-film beams
AU - Xue, Tiancheng
AU - Yeo, Hong Goo
AU - Trolier-Mckinstry, Susan
AU - Roundy, Shad
N1 - Funding Information:
Figure 1 illustrates the design of the proposed harvester in an exploded view. Six petal-shape bimorph PZT thin-film beams are mechanically clamped on the casing. The active length of the piezoelectric beam is 14.4 mm while the width is 3 mm and 15 mm at the tip and the base, respectively. The proposed petal shape not only improves the strain profile [7] but also fully utilizes the available area for sufficiently strained piezoelectric materials. The brass rotor is supported by two ball bearings. Tungsten weights are added to the outer rim of the rotor to increase mass and eccentricity which in theory increases the maximum potential power that can be generated [4]. Four cube NdFeB magnets (2mm × 2mm × 2mm) are evenly placed on the rotor. There are identical magnets attached on the tip of the six beams. This mismatch between rotor magnets and beam magnets is a deliberate arrangement to avoid synchronized beam plucking, which is likely to induce a large detent torque on the rotor that inhibits its continuous rotation, especially when the excitation is weak. The magnets are in a repulsive configuration along the direction of beam length with an intentional offset in the out of plane direction to realize the out-of-plane plucking [6].
PY - 2017/7/26
Y1 - 2017/7/26
N2 - A wrist-worn eccentric rotor-based energy harvester utilizing multiple magnetically plucked flower petal-shaped bimorph lead zirconate titanate (PZT) thin-film beams was designed and fabricated. The bimorph beams were formed by depositing {001} oriented PZT films up to 5.4 μm in thickness on both sides of a 50 μm thick nickel foil. The prototype was characterized with an analytical system-level model and a bench-top swing-arm test set-up. The prototype can achieve approximately 40 μW power output from a bench-top pseudo walking motion input. Further simulation suggests that improvement can be made by growing thicker PZT layers.
AB - A wrist-worn eccentric rotor-based energy harvester utilizing multiple magnetically plucked flower petal-shaped bimorph lead zirconate titanate (PZT) thin-film beams was designed and fabricated. The bimorph beams were formed by depositing {001} oriented PZT films up to 5.4 μm in thickness on both sides of a 50 μm thick nickel foil. The prototype was characterized with an analytical system-level model and a bench-top swing-arm test set-up. The prototype can achieve approximately 40 μW power output from a bench-top pseudo walking motion input. Further simulation suggests that improvement can be made by growing thicker PZT layers.
UR - http://www.scopus.com/inward/record.url?scp=85029361652&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85029361652&partnerID=8YFLogxK
U2 - 10.1109/TRANSDUCERS.2017.7994065
DO - 10.1109/TRANSDUCERS.2017.7994065
M3 - Conference contribution
AN - SCOPUS:85029361652
T3 - TRANSDUCERS 2017 - 19th International Conference on Solid-State Sensors, Actuators and Microsystems
SP - 375
EP - 378
BT - TRANSDUCERS 2017 - 19th International Conference on Solid-State Sensors, Actuators and Microsystems
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 19th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2017
Y2 - 18 June 2017 through 22 June 2017
ER -