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Maintaining the harmonic current suppression level of the rectifier system with different DC loads is significant. This paper presents a stress-based variable phase-shifting reactor based on the magnetostrictive effect of Galfenol, the inductance of PSR can be variable and steerable. The 3D finite element model of stress-based PSR is built, the magnetic flux distributions in the core of PSR and Galfenol,...
This paper presents the investigations of short-circuit current, electromagnetic force, and transient dynamic response of windings deformation including mechanical stress, strain, and displacements for an oil-immersed-type 220-kV power transformer. The worst-case fault with three-phase short-circuit happening simultaneously is assumed. A considerable leakage magnetic field excited by short-circuit...
In order to expand the application of AFM, a new type of atomic force microscope (AFM) with multi-scanners is developed. Unlike conventional single-scanner AFM, this system owns sample-scan mode with tube-piezo scanner, tip-scan mode with stack-piezo scanner, and the combined mode with piezo feedback and step motor scanner. With these scanners, the AFM is suitable not only for high resolution imaging...
This paper presents a new model and algorithm for slef-organization and control of a class of next generation communication networks: hierarchical heterogeneous wireless networks (HHWNs), under real world physical constraints. A nature inspired flocking algorithm (FA) is investigated in this context. Our model is based on the control framework at the physical layer presented previously by the authors,...
In this paper, 2D finite element method is used to calculate the static characteristics of switched reluctance motor, such as the electromagnetic normal force, flux-linkage and torque-angle-current characteristics. The system model is build to study the vibration dynamic response which is excited by electromagnetic force. Because vibration is a major problem of switched reluctance motor drive system,...
Vibration is a major problem of switched reluctance motor drive system, which can cause undesirable acoustic noise. Acoustic noise is severe when the periodic excitation of the machine normal force excites a natural vibration mode of the stack. So, it is very important for making the periodic excitation frequency to avoid the natural vibration frequency of the stator. In this paper, the electromagnetic...
The stator radial vibration caused by the radial force is the main origin of vibration and acoustic noise in switched reluctance motors. Obtaining non-linear relations of the radial force with the phase current and the rotor position and the radial force waveforms are very important for the nonlinear vibration study. In this paper, non-linear static radial forces at different rotor positions and different...
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