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This paper presented a rotational electromagnetic energy harvester to scavenge the human kinetic energy and convert into electrical energy. The harvester simply introduced a cylindrical stator and disk-shaped rotor, which are made of NdFeB. Without complicated movement mechanism, the stator and rotor, of a higher pair have theoretical line contact by magnetic attractive force. Therefore, the rotor...
In high speed electric machines, stator slots are wide opened for an easy Litz wire coil insertion. Often, to avoid excessive rotor losses due to open slots, magnetic wedges are used. During operation these magnetic wedges can get loose and brittles. With the accumulation of iron powder on the end windings (overhangs), it can lead to a total failure of the stator and the interruption of the process...
In cyclic motions, e.g. during locomotion, part of total kinetic energy, which otherwise would be wasted during direction inversion, can be conveniently stored in elastic elements in order to be later reused. Such energy recovery strategy, which can be adopted in robotic systems to improve energetic autonomy, mimics biological solutions, where muscles, tendons and ligaments are exploited also as elastic...
This research investigates steady behaviors of a rotor at the resonance in a high-Tc superconducting bearing system. Such a low-damping multi-degree-of-freedom system, subjected to nonlinear force, can show complex dynamical behaviors. Our numerical and experimental results show that, in a system of a high-Tc superconducting bearing, subharmonic resonance and internal resonance with subharmonic resonance...
In miniature magnetically levitated rotating machines, permanent magnet bearings are generally used for rotor levitation in the radial directions, while and electromagnetic actuators are used for stabilization in the axial direction. In this configuration rotor radial oscillations are inevitable because no controllable force is applicable in these directions. This paper presents the implementation...
The 3D finite element analysis (FEA) is used to establish the natural frequencies and vibration modes of the magnetic bearing-rotor system of high-speed machine and to define bearing stiffness of 3D-FEA model by exciting experiment. The critical speeds calculated by the method of FEA consistent with tested results of a high speed permanent magnet (PM). The study shows that the magnetic bearings introduce...
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