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Doubly salient electro-magnetic machine using traditional control method has large torque ripple for dead-time during commutation process and its special structure. During commutation, electro-magnetic torque and power will decrease quickly due to all switches are off states. In order to avoid the problem, a novel phase-shifted and interleaved angel control strategy was proposed in this paper. The...
Electromagnetic band-gap (EBG) structures can serve in the reduction of mutual coupling by using their capability of suppressing surface waves propagation in a given frequency range. In this paper, a dual layer uni-planar compact EBG (UC-EBG) structure is analyzed and its dispersion diagram is extracted using the commercial finite element full wave solver High Frequency Structure Simulation (HFSS)...
A new type of mode convert piezoelectric drill is presented. The drill uses converse piezoelectric effect to work. When exciting voltage is applied on piezoelectric ceramics, the basic structure of the drill will produce longitudinal vibration, which will be converted to local bending vibration by the drill bit fixed on the basic structure with an angle. These two vibrations will be composed to form...
Electromagnetic band gap (EBG) structures are widely used for improving the electromagnetic performance. Its surface wave forbidden frequency band and in-phase reflection frequency band are referred as work frequency band, whose properties are closely associated with the parameters of the EBG structure, such as substrate permittivity, substrate thickness, patch size, gap size, etc. This paper presents...
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