Wide Velocity Domain Magnetically Coupled Piezoelectric Wind Energy Harvester
A magnetic coupling and speed domain technology, applied in wind power generation, wind motor combination, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve the problem of low reliability, poor adaptability, and difficulty in meeting the needs of piezoelectric constants and other issues, to achieve the effects of wide application fields, high electromechanical coupling coefficient, improved energy density and reliability
Active Publication Date: 2019-08-23
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
[0003] Aiming at the defects of poor environmental adaptability, low energy density, low reliability, and difficulty in meeting the needs of piezoelectric constants in the prior art, the present invention proposes a wide-velocity domain magnetically coupled piezoelectric wind energy harvester, which can start to work under different wind speed ranges Harvesting wind energy
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[0026] Such as Figure 1-Figure 5 As shown, in this embodiment, the cup blade 1 is fixed on the upper end of the rotating shaft 2, and the rotating shaft 2 is respectively connected to the upper fixing plate 3 and the lower fixing plate 4 through bearings 10, and several connecting mounting plates 5 are fixedly arranged on the upper fixing plate 3 and the lower fixing plate 4. Between the lower fixed plates 4, the connecting mounting plate 5 is fixedly connected with the magnetic coupling piezoelectric generator 6 or the generating coil 7, the middle blade 8 with the excitation magnet 9 is fixedly connected with the rotating shaft 2, and the control unit 14 is arranged on the lower fixed plate The concave part of the bottom surface is integrated with a piezoelectric power generation circuit, an electromagnetic power generation circuit and a micro control module.
[0027] Such as Figure 6 As shown, the magnetically coupled piezoelectric generating mechanism 6 includes: a piez...
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Disclosed is a wide-speed-domain magnetic force coupling piezoelectric wind energy collector. The wide-speed-domain magnetic force coupling piezoelectric wind energy collector comprises a wind power rotary mechanism, a power generation apparatus and a rotor arranged in the power generation apparatus and connected with the wind power rotary mechanism, wherein the wind power rotary mechanism is rotationally arranged in the center of the power generation apparatus; a plurality of power generation units directly aligned to the rotor are arranged in the power generation apparatus; each power generation unit comprises a magnetic coupling piezoelectric power generation mechanism and a power generation coil; and the power generation coils and the magnetic coupling piezoelectric power generation mechanisms are arranged at intervals to be connected with the control unit separately. Through rotation, wind power is converted into periodical magnetic force to act on the magnetic coupling piezoelectric power generation mechanisms, so that a higher electromechanical coupling coefficient is realized, and energy density and reliability are improved; by virtue of designed multiple magnetic force coupling configuration, counteractive reluctance torque is overcome, so that the apparatus can perform effective operation even if at relatively low wind power; when the wind power is relatively high, an electromagnetic inductive power generation coil is switched on; and meanwhile, the magnetic coupling piezoelectric power generation mechanisms and the power generation coils are adopted for power generation, so that more energy can be harvested.
Description
technical field [0001] The invention relates to a technology in the field of wind power generation, in particular to a wide speed domain magnetic coupling piezoelectric wind energy collector. Background technique [0002] Traditional wind power mostly uses rotating turbine devices, which have low energy density and large volume, and are not suitable for miniaturization. At present, many scholars use the piezoelectric effect to design miniaturized wind energy harvesters. At present, most piezoelectric wind energy harvesting designs use wind-induced vibrations to repeatedly bend a single-layer or double-layer piezoelectric sheet attached to a cantilever beam, thereby converting wind energy into electrical energy. Using the piezoelectric sheet through the bending mode (d31) not only has a low piezoelectric constant, but also the piezoelectric sheet is easily degraded or even damaged in repeated bending. Another key problem of wind energy harvesting devices is poor environment...
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IPC IPC(8): H02N2/18F03D9/25
CPCF03D9/257H02N2/186Y02E10/72
Inventor 赵林川张文明邹鸿翔刘丰瑞
Owner SHANGHAI JIAOTONG UNIV