Abstract
Majority of the reported kinetic energy harvesting mechanisms involve translatory transduction mechanisms, which diverges from the long established rotary design for electromagnetic generators. A rotary design can offer a much smaller magnet-coil air gap and clearance guidance that translatory transducers simply cannot physically attain. Therefore, this research investigates the feasibility of implementing a V-shaped magnet rotor for the purpose of coupling base point excitation into rotation, which can eventually be coupled to a generator motor. It was also previously theorised that the nonlinear magnetic coupling can give rise to broadband nonlinear resonant behaviour. The resultant device aims to enhance the overall power conversion efficiency of the captured vibration energy.
Highlights
Vibration energy harvesting (VEH) has predominantly been achieved by translatory mechanisms, such as cantilever amplifiers, to accumulate kinetic energy [1]
This research investigates the feasibility of implementing a V-shaped magnet rotor for the purpose of coupling base point excitation into rotation, which can eventually be coupled to a generator motor
This paper investigates the feasibility of implementing a V-shaped magnet rotor to harvest base point excitation to be fed into a conventional generator motor
Summary
Vibration energy harvesting (VEH) has predominantly been achieved by translatory mechanisms, such as cantilever amplifiers, to accumulate kinetic energy [1]. With a slightly eccentric centre of mass, the rotor behaves like a compound pendulum and radial excitation can trigger either direct resonance or Mathieu instability [2, 3]. This establishes a pathway to experimentally implementing a previously theoretically simulated rotary auto-parametric oscillator [4] for extending the bandwidth of resonant vibratory motion. 2. Theory and design Figure 1 summarises the basic degrees of freedom of the proposed mechanism, where base point excitation is fed into a magnetic spring that is in turn coupled to a rotor by the magnetic V-track.
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