Reduction of Rotational Vibration Using Coriolis Force Generated by Electromagnetic Oscillatory Actuator Moving in Radial Direction

Numerical Simulation on Electromagnetic Energy Harvester Oscillated by Speed Ripple of AC Motors

“…In this section, we compare the power generation conditions of the proposed energy harvester with those reported in the authors' previous study [10]. The power generation principle in the proposed harvester is illustrated in Figure 2.…”

“…The axial distance between the energy harvesters and the rotor is assumed to be sufficiently large to prevent flux interferences. In contrast to the systems studied in previous work [9,10], this energy-harvesting system requires neither an external power supply nor a controller. Nonetheless, a slip ring is still necessary for externally extracting the generated electrical power.…”

“…Here, J is the rotor's moment of inertia, θ is the rotational angle of the rotor, l is the initial length from the origin, r is the radial displacement of the harvester, c θ is the viscous damping coefficient for the rotational motion, T e is the output torque of the AC motor, T l is the load torque, c r is the viscous damping coefficient for the radial oscillation, k r is the spring stiffness of the harvester, K t is the thrust constant of the harvester, and I is the current caused by electromagnetic induction. The detailed mathematical model can be found in [10,17]. In (1), the multiple harvester oscillators are treated as single equivalent inertia m. The fourth term on the left side of (1) is the Coriolis force acting on the rotor, and the first term on the right side of ( 2) is the centrifugal force acting on the harvester's oscillator.…”

“…The power generation principle in the proposed harvester is illustrated in Figure 2. A rotational vibration system was assumed in [10], in which the rotor was connected to a fixed surface via a torsional spring. Hence, the motion of the rotor was a rotational vibration rather than a steady rotation.…”

“…We proposed a different approach to suppress torque ripples using the Coriolis force generated by the radial vibration of a linear oscillatory actuator (LOA) [9,10]. The Coriolis force is caused by the resonant behavior of the LOA's mover, which oscillates radially in the rotational coordinate of the rotor.…”