In order to improve Multi-polar magnetic structure’s efficiency. Ansoft Maxwell of electromagnetic field finite element software is utilized to study the effect of different polarity arrangement of magnetic seeding element on the magnetic induction intensity of seeding element end and magnetic field distribution in the seeding air gap. As a result of the different electromagnetic coil current d...

While developing an electrical machine, the main task is to obtain an optimal magnetic field’s distribution. It can be reduced to the selection of such constructive parameters that ensure the best circumstances for magnetic field’s existence. This work is dedicated to the determination of an optimal rotors shape for the synchronous reactive frequency doubler (SRFD). The task is solved by using ...

In this paper a description and operating principles of a consequent-pole permanent-magnet machine are presented. In addition, a sizing analysis, finite-element analysis, and experimental results for a prototype machine are addressed. Due to its particular configuration, this machine allows for a wide range of control of the air-gap flux with minimum field ampere-turn requirements and without b...

In this paper, deep sub-micron CMOS process compatible high Q on chip spiral inductors with air gap structure were designed and fabricated. In the design the electromagnetic solver, SONNET, and the finite element program, ANSYS, were used for electrical-characteristics and maximum mechanical strength, respectively. The copper wires were capped with electroless Ni plating to prevent the copper f...

We experimentally characterize the field confinement properties of various parallel-plate waveguide (PPWG) geometries in the terahertz spectral range. In contrast to infinite-width PPWGs with free-space diffraction along the unshielded direction, finite-width (and also tapered) PPWGs showwell-confined THz fields at the output facet. Both the transverse field component, perpendicular to the insi...

This paper presents an analytical model to estimate the motional resistance for partial air gap capacitivelytransduced MEMS resonators. This model serves as a link between the well formulated analytical models for conventional air gap and internal dielectric transduction schemes, thereby helping decide which scheme is optimal for a given design frequency. Using this model, we simulate and exper...

INTRODUCTION TO AIR BLAST MEASUREMENTS An explosion in air is a process by which a rapid release of energy generates a pressure wave of finite amplitude. The energy source can be anything that generates a violent reaction when initiated. This includes: chemical or nuclear materials, gases (high pressure gasstorage vessels, steam boilers), or electricity (spark gap, rapid vaporization of a metal...

In this paper a fuzzy levitation controller for a one degree of freedom maglev application is designed and its performance is compared with the performance of a state controller. The comparison is based on both simulation and measurement results. The maglev application is a levitation/propulsion head of an autonomous transportation vehicle with a nominal air gap value of 2.5 mm. First a nonline...

Abstract: Several nonwovens were studied to explore the relationship between their structural characteristics, permeability and acoustic absorbing behavior. Fundamental structural parameters including thickness, gram square meter and porosity were considered. Results show that the permeability is not just linear to porosity, but also related to many other complex and difficult-to-measure parame...

Using the method of separate variables, the three-dimensional magnet field solution expressed in Fourier’s expansion for permanent magnet (PM) machines with finite axial magnet length is presented in this paper. From the analytic results obtained, much useful and interesting design information for PM machines in three dimensions may be quantitatively deduced. Design curves of the leakage factor...