An Inductively Coupled Power Transfer system (ICPT) of 5 kW that allows an air gap of 20 cm has been studied and developed. The mechanical scheme is shown in Fig. 1. The study has been focused in analyzing the influence of the frequency deviation with respect to the resonant frequency. This study has been carried out as a part in the development of a supply system for electric vehicles both wit...

In induction machines, an eccentrically positioned rotor experienced a strong unbalanced pull toward the short side of the air gap. The non-symmetric flux distribution due to the eccentricity induces circulating currents in the rotor cage and parallel branches of the stator winding. These currents equalise the flux distribution and reduce the unbalanced magnetic pull. In this paper, the effects...

In robotics, Air Muscle is used as the analogy of the biological motor for locomotion or manipulation. It has advantages like the passive Damping, good power-weight ratio and usage in rough environments. An experimental test set up is designed to test both contraction and volume trapped in Air Muscle. This paper gives the characteristics of Air Muscle in terms of contraction of Air Muscle with ...

This work evaluates the potential of pulsed – transient thermography for locating fixtures beneath aircraft skins in order to facilitate accurate automated assembly operations. Representative aluminium and carbon fibre aircraft skin-fixture assemblies were modelled using ThermoCalc-3D. The assemblies were also experimentally investigated with the ThermoScope system and a custom built system inc...

A Rectangular Dielectric Resonator Antenna (RDRA) fed by Dielectric Image Line (DIL) through a narrow slot placed on a finite ground plane is numerically investigated. The effects of ground plane size on the radiation performance of the antenna are analyzed. To increase the antenna gain, four sidewalls are placed around the corners of the ground. Also, a reflector is placed at the back side of ...

This paper presents a non invasive method for estimating the energy efficiency of induction motors used in industrial applications. This method is innovative because it is only based on the measurement of the external field emitted by the motor. The paper describes the sensors used, how they should be placed around the machine in order to decouple the external field components generated by both...

A theoretical analysis of a gap-coupled stacked annular ring microstrip antenna with superstrate is performed in order to obtain wider bandwidth operation. The effects of air gap, superstrate thickness and feeding point location on the antenna performance are analyzed in TM11 mode using equivalent circuit concept. It is noted that the proposed antenna is very sensitive to the feeding point loca...

The speed of memory structures is considerably slower than that of logic thus permitting a variety of approaches to achieving and using bistability. We used the bistability of a doubly clamped beam to attain two states that can potentially be used in the implementation of a nonvolatile memory [1]. The device is designed such that a bistable beam acts as the gate of an air gap transistor. In the...

Inductive transducers for measuring displacement are divided into two groups according to their measurement range. A variable air-gap type transducer is widely used for a measurement small range. A conventional variable air-gap type transducer has high sensitivity but lacks a linear measurement range. The air gap is also increased to maintain linearity as the measurement range increases, which ...

In this article, the large air gap electromagnetic suspension system model is accurately divided into the mesh by the method of the finite element analysis, then the electromagnetic force of the suspended matter in the system is calculated. Finally, the fitting curves of the experimental data of a new kind of distributed electromagnetic array system can be obtained through the least squares met...