This paper reviews and summarizes Maglev train technologies from an electrical engineering point of view assimilates the results works over past three decades carried out all world. Many researches developments concerning have been accomplished; however, they are not always easy to understand. The purpose this is make clear at a glance. Included general understandings, technologies, worldwide practical projects. Further research needs also addressed.

Wireless sensor network (WSN) is an emerging technology that shows great promise for various futuristic applications both mass public and military. The sensing combined with processing power wireless communication makes it lucrative being exploited in abundance future. inclusion of also incurs types security threats. intent this paper to investigate the related issues challenges networks. We identify threats, review proposed mechanisms discuss holistic view ensuring layered robust networks

This paper proposes an all-in-one system for hyperloop that conducts propulsion, levitation, and guidance. Currently demand on high-speed long-distance transportation is increasing, so getting attention studied hard globally. Hyperloop a new innovative in which levitated subsonic speed train travels through vacuum cylindrical tube. needs functions of guidance its service, many devices are necessary those functions. In the tube, constrained space, make entire complicated, size vehicle tube...

This paper presents the optimal rotor design method in a single-phase line-start permanent magnet motor (LSPM) considering starting torque and efficiency. To consider nonlinear characteristics, process is comprised of FEM analytical method. During this study, permanent-magnets cage bars were designed using magnetic equivalent circuit barriers that control all flux FEM, tradeoff efficiency controlled by weight function Taguchi simulation. Finally, performance model compared with those...

An energy-efficient crystal-less double-FSK transceiver for wireless body-area-network (WBAN) sensor nodes is implemented in 0.18-μm CMOS technology with a 1-V supply. The injection-locking digitally controlled oscillator (IL-DCO) replaces the crystal (XO), which leads to significantly reduce energy consumption and system cost. With proposed calibration method using an detector (IL-detector), frequency drift of DCO can be calibrated within 100-kHz accuracy over 100° temperature variation....

In order to design a permanent magnet synchronous motor (PMSM), the inductance must be computed. this paper, flux concentrating PMSM (FCPMSM) is introduced. Calculating difficult because of complex structure rotor. Because rib and bridge consist an iron core, they have nonlinear characteristics. obtain effective value inductance, characteristics considered in magnetic equivalent circuit (MEC). calculate FCPMSM, relative permeance rotor was analyzed. Then, dq-axis MEC, including reluctance,...

This paper presents a new method for calculating the braking force of drum-type eddy current brake with two-layer structure. The should have structure that improves by applying material high conductivity inside drum because loss generated from is used as force. In addition, operates at various speeds while vehicle, it necessary to grasp according speed. Furthermore, composed non-laminated iron having conductivity, skin effect and armature reaction phenomenon appear, depth air-gap flux...

This paper presents a new approach to analyze the stator inter-turn fault of brushless dc motor. It is essential behavior machine under internal faults and design appropriate protection systems avoid expensive failures that might occur in near future. The winding functions inductance change windings are explained detail, informative simulation results, based on function theory, provided current's abnormalities torque pulsation turn-to-turn faults. To verify proposed analysis, current,...

In the case of designing high-speed surface-mounted permanent magnet synchronous motor (SPMSM), rotor retaining sleeve is inserted into to prevent magnet's damage. It quite an efficient way consider manufacturability, but becomes major source ohm loss in operation. this paper, for a turbo blower at rating 100 kW, 20000 r/min was introduced. To improve its efficiency, sleeve's optimal design needed. For this, parametric analysis on shape carried out different type motor. Within range that...

This paper is a study on the application position of skew in order to reduce cogging torque magnetic geared synchronous motor (MGM). The affects noise and vibration motor, so it should be reduced as much possible. To solve this problem, conventional permanent magnet (PM) skewed PM. However, unlike other motors, MGM has pole pieces (PPs), larger generated due reluctance difference. There have been few studies reduction MGM, essential structure MGM. Therefore, derived optimum method by...

In this paper, linear induction motor is analyzed by 3-D finite-element method (3-D FEM) to consider influence of construction secondary reaction plate on the transverse edge effect. A effective analysis model for considering effect caused finite widths primary and not only proposed, but also simple measuring using patterns currents induced in proposed. With method, various models with overhang cap have been relationship between

A Low-power IEEE 802.15.6 human body communication (HBC) fully compatible transceiver is implemented in 130 nm CMOS process. In this work, the proposed HBC satisfying all standard requirements has four key features for low power consumption which includes: 1) low-power analog active filters TX spectral mask: 30% reduction; 2) delayed locked loop (DLL) based BPSK receiver with S/H operation turning off unnecessary blocks: 40% 3) mode (LP-mode) received signal strength indicator (RSSI) output...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents a research on magnetic torque improvement of interior permanent magnet synchronous motor (IPMSM) for direct drive washing machine by considering various barrier shapes. For the machine, IPMSM must have high at low speed in laundry mode. However, it is decreased and ripple also increased same time, when current phase angle increased. By using finite element analysis (FEA),...

In case of high-speed maglev trains, the propulsion force their linear synchronous motor (LSM) is an essential performance element since LSM responsible for both and levitation train. A large thrust ripple causes vibration, noise severe disturbance during train operation. Because these reasons, efforts must be made to reduce levitation. this study, a method decrease that noise, generated operation 700 km/h ultra-high-speed tube train's was investigated. method, module phase set shift (MPSS)...

The interior permanent magnet synchronous motor (IPMSM) is usually applied to the traction in hybrid electric vehicle and due its high-power density wide speed range. In this paper, IPMSM with concentrated winding for a 110 cc motorcycle introduced. Its design was improved high efficiency operation output characteristics were also analyzed according partial magnetic saturation of shoe web many variables. Because affects harmonics eddy current loss magnet, it confirmed that significantly...

In this paper, the advanced control methods to minimize torque ripple and maximize power density of a brushless DC (BLDC) motor/generator system in electric vehicles (EVs) hybrid (HEVs) are presented. A simple straightforward method with copper loss minimization for BLDC machines is proposed first. Then, an optimal machine size weight non-sinusoidal explained generation mode EVs HEVs. Overall, approaches can improve performance system. Fundamental theory presented demonstrated by simulations...

A low power Human Body Communication (HBC) Transceiver (TRX) with Duty Cycle Control (DCC) is proposed for energy medical body area network (BAN) system To achieve a fully IEEE standard compatible consumption, 1) MAC scheduler and 2) HBC modem maximum likelihood detection (MLD) scheme are proposed. Thanks to DCC, 38% average duty 96.6% quality of service (QoS) achieved 2.77mW consumption the 64 sensor nodes hub. The RF circuits in TRX satisfy WBAN requirements. And reconfigurable LNA...

This paper presents switch fault detection and compensation control schemes for a modified dc-dc converter that relocates diode location. The proposed are applicable to various energy generation systems include storage. A index has been introduced detect an open in the structure, method based on mixed switching strategy developed. fault-tolerant along with scheme can make system return work even under fault. have tested verified both by simulations experiments using TMS320F28335 DSP. results...

The recent focus on greenhouse gas emissions from fossil fuel usage has led to strengthened regulations carbon emissions. Consequently, research electric vehicles (EV), which have higher energy efficiency compared internal combustion engine vehicles, is actively being pursued. With advancements in the technology of electronic components there a growing trend demand for higher-rated capacities Low DC-DC Converter (LDC) that possess wide input-output voltage range. Furthermore, restricted...

We proposed a spatially resolved optical emission spectrometer (SROES) for analyzing the uniformity of plasma density semiconductor processes. To enhance spatial resolution SROES, we constructed SROES system using series lenses, apertures, and pinholes. calculated variation pinhole size, our results were in good agreement with measured SROES. The performance was also verified by detecting correlation between distribution fluorine radical inductively coupled etch process rate SiO2 film on...