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A novel three-section transmission line based T-type dual-band impedance transformer (DBIT) with its closed-form design equations is proposed in this paper. The proposed impedance transformer could transform two different complex impedances to a resistive load at two arbitrary real frequencies. A section transmission line is employed to transform the two different complex impedances to the same complex...
Most of magnetic encoder ICs are on-axis, and they are generally suitable for inner rotor PMSM, sometimes used in external rotor PMSM. However, in some special occasions, these ICs are not used for the difficulty of mounting, for example, there is an external rotor PMSM with a hollow shaft, which is convenient for passing the control wire. It is difficult to mount these encoder ICs, because there...
This paper presents the design and implementation of a high speed sensorless brushless DC motor (BLDCM) drive with commutation compensation. The back electromotive force (EMF) detection using three phase terminal voltage is implemented to detect the rotor position, in order to filter the high frequency switching signals, a low pass filter is applied in the back EMF detection circuits, the cut-off...
This paper proposed an integrated hall magnetic encoder error correction method. In order to eliminate the steady-state error caused by installation errors and so on, this paper proposed three-phase zero and sine symmetric reconstruction. The sum of three-phase hall signal could be constant zero through zero reconstruction. In sine symmetric reconstruction method, transform three-phase hall signal...
As the key critical load-bearing parts of the high-speed EMU, the quality of wheel set has diiect impact on the safety. Now in China, equipment for detecting the wheels quality is usually installed in the CRH entrance line with CRH passing in low speed. As one of the important contents of wheel quality detection, whether wheel flat can be timely and accurate detected or not, is especially important...
A novel dualband impedance transformer based on fractional-order inductor and capacitor is proposed in this paper. This transformer is designed to transfer the arbitrary frequency-dependent complex impedances sources to loads at two irrelevant frequencies with one fractional-order inductor and two fractional-order capacitors. Each fractional-order element has two parameters to be determined: the order...
Different types of multiscale problems encountered in classical electromagnetics are discussed. A nomenclature is proposed that is useful for identifying the difficulty of a problem and the suitability of a computational method for solving it.
At present, the research of robots imitating water strider is mainly focusing on imitating the skating movement of the insects. In contrast, the jumping motion of water striders needs a sufficiently large driving force to lift the body detaching from the water surface, which is easy to break the hydrophobic property of the material and result in the sinking of the robot, so there is few research on...
In recent years, with the rapid development of renewable energy, power energy storage has become a bottom neck of its development, and superconducting magnetic energy storage (SMES) seems to be a viable solution. A topology based on common DC voltage bus is proposed for high power voltage source converter (VSC)-SMES. The mathematical model of SMES is constructed and the detailed control strategy is...
This paper presents the responses of the vehicle and track components in terms of vertical forces and displacements. The considered vehicle model is a 10-DOF multi-rigid-body system supported on a track systems that consider three layers of structure. The car body is linked with the bogie through the secondary suspension system contained spring and damper elements. In the model of track, the rail...
The FFT-truncated multilevel interpolation method is used to accelerate the solution of the volume electric field integral equation pertinent to the simulation of wellbore resistivity measurements of hydraulic fractures. The scattering problem includes geometrical features at multiple length scales and the analysis is in the mixed-frequency regime, where the discretization lengths are dictated not...
In this paper, an aluminum plate with a Peltier devices are used as a model. For the Peltier actuated thermal process is a nonlinear control affine system and the real system is usually contains fault owing to various factors, it is difficult to achieve excellent control consequent. In this paper, robust right coprime factorization is applied to analyse the thermal process. Then the derivation of...
Indexing global-scale 3D vector data is a challenging task because more and more vector datum is used to analyze global problems. Various indices of 2D vector based on tree or grid structures have been approached. Although these indices may support 2D vector indices effectively, they do have some significant drawbacks for indexing global-scale 3D vector, such as critical spatial overlapping, unstable...
The fixed-fixed beam in RF switches fabricated by MEMS techniques of a sacrificial layer is inclined to stick to the substrate due to the significant capillary force during drying process. In this paper, sticking models of the fixed-fixed beam are investigated to analyze the sticking effect. Based on these models, an adhesion criterion hc for the fixed-fixed beam is derived to determine whether the...
This paper presents a fully lumped element model to describe on-chip symmetrical and asymmetrical coupled transmission lines on silicon substrate. The current methodology is based on the modeling of "c" and " pi " mode wave propagated in the coupled interconnects respectively, in which the lumped elements are extracted using rigorous frequency asymptotic technique without any optimization...
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